version 1.6, 2002/07/24 08:00:11 |
version 1.8, 2004/02/13 05:48:35 |
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# define NEED_FIND_LIMIT |
# define NEED_FIND_LIMIT |
# endif |
# endif |
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#ifdef NEED_FIND_LIMIT |
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# include <setjmp.h> |
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#endif |
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#if defined(FREEBSD) && defined(I386) |
#if defined(FREEBSD) && defined(I386) |
# include <machine/trap.h> |
# include <machine/trap.h> |
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# if !defined(PCR) |
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# define NEED_FIND_LIMIT |
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# endif |
#endif |
#endif |
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#ifdef NEED_FIND_LIMIT |
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# include <setjmp.h> |
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#endif |
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#ifdef AMIGA |
#ifdef AMIGA |
# define GC_AMIGA_DEF |
# define GC_AMIGA_DEF |
# include "AmigaOS.c" |
# include "AmigaOS.c" |
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# define jmp_buf sigjmp_buf |
# define jmp_buf sigjmp_buf |
#endif |
#endif |
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#ifdef DARWIN |
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/* for get_etext and friends */ |
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#include <mach-o/getsect.h> |
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#endif |
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#ifdef DJGPP |
#ifdef DJGPP |
/* Apparently necessary for djgpp 2.01. May cause problems with */ |
/* Apparently necessary for djgpp 2.01. May cause problems with */ |
/* other versions. */ |
/* other versions. */ |
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# define OPT_PROT_EXEC 0 |
# define OPT_PROT_EXEC 0 |
#endif |
#endif |
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#if defined(LINUX) && \ |
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(defined(USE_PROC_FOR_LIBRARIES) || defined(IA64) || !defined(SMALL_CONFIG)) |
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/* We need to parse /proc/self/maps, either to find dynamic libraries, */ |
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/* and/or to find the register backing store base (IA64). Do it once */ |
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/* here. */ |
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#define READ read |
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/* Repeatedly perform a read call until the buffer is filled or */ |
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/* we encounter EOF. */ |
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ssize_t GC_repeat_read(int fd, char *buf, size_t count) |
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{ |
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ssize_t num_read = 0; |
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ssize_t result; |
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while (num_read < count) { |
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result = READ(fd, buf + num_read, count - num_read); |
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if (result < 0) return result; |
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if (result == 0) break; |
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num_read += result; |
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} |
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return num_read; |
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} |
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/* |
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* Apply fn to a buffer containing the contents of /proc/self/maps. |
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* Return the result of fn or, if we failed, 0. |
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*/ |
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word GC_apply_to_maps(word (*fn)(char *)) |
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{ |
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int f; |
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int result; |
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int maps_size; |
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char maps_temp[32768]; |
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char *maps_buf; |
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/* Read /proc/self/maps */ |
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/* Note that we may not allocate, and thus can't use stdio. */ |
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f = open("/proc/self/maps", O_RDONLY); |
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if (-1 == f) return 0; |
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/* stat() doesn't work for /proc/self/maps, so we have to |
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read it to find out how large it is... */ |
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maps_size = 0; |
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do { |
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result = GC_repeat_read(f, maps_temp, sizeof(maps_temp)); |
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if (result <= 0) return 0; |
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maps_size += result; |
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} while (result == sizeof(maps_temp)); |
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if (maps_size > sizeof(maps_temp)) { |
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/* If larger than our buffer, close and re-read it. */ |
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close(f); |
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f = open("/proc/self/maps", O_RDONLY); |
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if (-1 == f) return 0; |
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maps_buf = alloca(maps_size); |
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if (NULL == maps_buf) return 0; |
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result = GC_repeat_read(f, maps_buf, maps_size); |
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if (result <= 0) return 0; |
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} else { |
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/* Otherwise use the fixed size buffer */ |
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maps_buf = maps_temp; |
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} |
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close(f); |
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maps_buf[result] = '\0'; |
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/* Apply fn to result. */ |
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return fn(maps_buf); |
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} |
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#endif /* Need GC_apply_to_maps */ |
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#if defined(LINUX) && (defined(USE_PROC_FOR_LIBRARIES) || defined(IA64)) |
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// |
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// GC_parse_map_entry parses an entry from /proc/self/maps so we can |
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// locate all writable data segments that belong to shared libraries. |
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// The format of one of these entries and the fields we care about |
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// is as follows: |
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// XXXXXXXX-XXXXXXXX r-xp 00000000 30:05 260537 name of mapping...\n |
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// ^^^^^^^^ ^^^^^^^^ ^^^^ ^^ |
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// start end prot maj_dev |
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// 0 9 18 32 |
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// |
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// For 64 bit ABIs: |
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// 0 17 34 56 |
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// |
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// The parser is called with a pointer to the entry and the return value |
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// is either NULL or is advanced to the next entry(the byte after the |
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// trailing '\n'.) |
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// |
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#if CPP_WORDSZ == 32 |
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# define OFFSET_MAP_START 0 |
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# define OFFSET_MAP_END 9 |
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# define OFFSET_MAP_PROT 18 |
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# define OFFSET_MAP_MAJDEV 32 |
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# define ADDR_WIDTH 8 |
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#endif |
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#if CPP_WORDSZ == 64 |
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# define OFFSET_MAP_START 0 |
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# define OFFSET_MAP_END 17 |
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# define OFFSET_MAP_PROT 34 |
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# define OFFSET_MAP_MAJDEV 56 |
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# define ADDR_WIDTH 16 |
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#endif |
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/* |
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* Assign various fields of the first line in buf_ptr to *start, *end, |
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* *prot_buf and *maj_dev. Only *prot_buf may be set for unwritable maps. |
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*/ |
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char *GC_parse_map_entry(char *buf_ptr, word *start, word *end, |
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char *prot_buf, unsigned int *maj_dev) |
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{ |
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int i; |
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char *tok; |
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if (buf_ptr == NULL || *buf_ptr == '\0') { |
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return NULL; |
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} |
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memcpy(prot_buf, buf_ptr+OFFSET_MAP_PROT, 4); |
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/* do the protections first. */ |
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prot_buf[4] = '\0'; |
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if (prot_buf[1] == 'w') {/* we can skip all of this if it's not writable. */ |
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tok = buf_ptr; |
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buf_ptr[OFFSET_MAP_START+ADDR_WIDTH] = '\0'; |
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*start = strtoul(tok, NULL, 16); |
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tok = buf_ptr+OFFSET_MAP_END; |
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buf_ptr[OFFSET_MAP_END+ADDR_WIDTH] = '\0'; |
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*end = strtoul(tok, NULL, 16); |
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buf_ptr += OFFSET_MAP_MAJDEV; |
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tok = buf_ptr; |
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while (*buf_ptr != ':') buf_ptr++; |
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*buf_ptr++ = '\0'; |
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*maj_dev = strtoul(tok, NULL, 16); |
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} |
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while (*buf_ptr && *buf_ptr++ != '\n'); |
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return buf_ptr; |
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} |
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#endif /* Need to parse /proc/self/maps. */ |
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#if defined(SEARCH_FOR_DATA_START) |
#if defined(SEARCH_FOR_DATA_START) |
/* The I386 case can be handled without a search. The Alpha case */ |
/* The I386 case can be handled without a search. The Alpha case */ |
/* used to be handled differently as well, but the rules changed */ |
/* used to be handled differently as well, but the rules changed */ |
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/* cover all versions. */ |
/* cover all versions. */ |
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# ifdef LINUX |
# ifdef LINUX |
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/* Some Linux distributions arrange to define __data_start. Some */ |
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/* define data_start as a weak symbol. The latter is technically */ |
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/* broken, since the user program may define data_start, in which */ |
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/* case we lose. Nonetheless, we try both, prefering __data_start. */ |
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/* We assume gcc-compatible pragmas. */ |
# pragma weak __data_start |
# pragma weak __data_start |
extern int __data_start[]; |
extern int __data_start[]; |
# pragma weak data_start |
# pragma weak data_start |
Line 617 ptr_t GC_get_stack_base() |
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Line 780 ptr_t GC_get_stack_base() |
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} |
} |
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/* Return the first nonaddressible location > p (up) or */ |
/* Return the first nonaddressible location > p (up) or */ |
/* the smallest location q s.t. [q,p] is addressible (!up). */ |
/* the smallest location q s.t. [q,p) is addressable (!up). */ |
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/* We assume that p (up) or p-1 (!up) is addressable. */ |
ptr_t GC_find_limit(p, up) |
ptr_t GC_find_limit(p, up) |
ptr_t p; |
ptr_t p; |
GC_bool up; |
GC_bool up; |
Line 661 ptr_t GC_get_stack_base() |
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Line 825 ptr_t GC_get_stack_base() |
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#include <sys/types.h> |
#include <sys/types.h> |
#include <sys/stat.h> |
#include <sys/stat.h> |
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#include <ctype.h> |
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# define STAT_SKIP 27 /* Number of fields preceding startstack */ |
# define STAT_SKIP 27 /* Number of fields preceding startstack */ |
/* field in /proc/self/stat */ |
/* field in /proc/self/stat */ |
Line 669 ptr_t GC_get_stack_base() |
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Line 834 ptr_t GC_get_stack_base() |
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extern ptr_t __libc_stack_end; |
extern ptr_t __libc_stack_end; |
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# ifdef IA64 |
# ifdef IA64 |
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/* Try to read the backing store base from /proc/self/maps. */ |
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/* We look for the writable mapping with a 0 major device, */ |
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/* which is as close to our frame as possible, but below it.*/ |
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static word backing_store_base_from_maps(char *maps) |
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{ |
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char prot_buf[5]; |
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char *buf_ptr = maps; |
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word start, end; |
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unsigned int maj_dev; |
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word current_best = 0; |
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word dummy; |
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for (;;) { |
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buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev); |
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if (buf_ptr == NULL) return current_best; |
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if (prot_buf[1] == 'w' && maj_dev == 0) { |
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if (end < (word)(&dummy) && start > current_best) current_best = start; |
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} |
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} |
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return current_best; |
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} |
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static word backing_store_base_from_proc(void) |
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{ |
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return GC_apply_to_maps(backing_store_base_from_maps); |
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} |
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# pragma weak __libc_ia64_register_backing_store_base |
# pragma weak __libc_ia64_register_backing_store_base |
extern ptr_t __libc_ia64_register_backing_store_base; |
extern ptr_t __libc_ia64_register_backing_store_base; |
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Line 678 ptr_t GC_get_stack_base() |
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Line 870 ptr_t GC_get_stack_base() |
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&& 0 != __libc_ia64_register_backing_store_base) { |
&& 0 != __libc_ia64_register_backing_store_base) { |
/* Glibc 2.2.4 has a bug such that for dynamically linked */ |
/* Glibc 2.2.4 has a bug such that for dynamically linked */ |
/* executables __libc_ia64_register_backing_store_base is */ |
/* executables __libc_ia64_register_backing_store_base is */ |
/* defined but ininitialized during constructor calls. */ |
/* defined but uninitialized during constructor calls. */ |
/* Hence we check for both nonzero address and value. */ |
/* Hence we check for both nonzero address and value. */ |
return __libc_ia64_register_backing_store_base; |
return __libc_ia64_register_backing_store_base; |
} else { |
} else { |
word result = (word)GC_stackbottom - BACKING_STORE_DISPLACEMENT; |
word result = backing_store_base_from_proc(); |
result += BACKING_STORE_ALIGNMENT - 1; |
if (0 == result) { |
result &= ~(BACKING_STORE_ALIGNMENT - 1); |
/* Use dumb heuristics. Works only for default configuration. */ |
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result = (word)GC_stackbottom - BACKING_STORE_DISPLACEMENT; |
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result += BACKING_STORE_ALIGNMENT - 1; |
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result &= ~(BACKING_STORE_ALIGNMENT - 1); |
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/* Verify that it's at least readable. If not, we goofed. */ |
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GC_noop1(*(word *)result); |
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} |
return (ptr_t)result; |
return (ptr_t)result; |
} |
} |
} |
} |
Line 696 ptr_t GC_get_stack_base() |
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Line 894 ptr_t GC_get_stack_base() |
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/* using direct I/O system calls in order to avoid calling malloc */ |
/* using direct I/O system calls in order to avoid calling malloc */ |
/* in case REDIRECT_MALLOC is defined. */ |
/* in case REDIRECT_MALLOC is defined. */ |
# define STAT_BUF_SIZE 4096 |
# define STAT_BUF_SIZE 4096 |
# if defined(GC_USE_LD_WRAP) |
# define STAT_READ read |
# define STAT_READ __real_read |
/* Should probably call the real read, if read is wrapped. */ |
# else |
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# define STAT_READ read |
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# endif |
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char stat_buf[STAT_BUF_SIZE]; |
char stat_buf[STAT_BUF_SIZE]; |
int f; |
int f; |
char c; |
char c; |
Line 772 ptr_t GC_get_stack_base() |
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Line 967 ptr_t GC_get_stack_base() |
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ptr_t GC_get_stack_base() |
ptr_t GC_get_stack_base() |
{ |
{ |
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# if defined(HEURISTIC1) || defined(HEURISTIC2) || \ |
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defined(LINUX_STACKBOTTOM) || defined(FREEBSD_STACKBOTTOM) |
word dummy; |
word dummy; |
ptr_t result; |
ptr_t result; |
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# endif |
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# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1) |
# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1) |
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Line 934 void GC_register_data_segments() |
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Line 1132 void GC_register_data_segments() |
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/* invalid result. Under NT, GC_register_data_segments is a noop and */ |
/* invalid result. Under NT, GC_register_data_segments is a noop and */ |
/* all real work is done by GC_register_dynamic_libraries. Under */ |
/* all real work is done by GC_register_dynamic_libraries. Under */ |
/* win32s, we cannot find the data segments associated with dll's. */ |
/* win32s, we cannot find the data segments associated with dll's. */ |
/* We rgister the main data segment here. */ |
/* We register the main data segment here. */ |
# ifdef __GCC__ |
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GC_bool GC_no_win32_dlls = TRUE; /* GCC can't do SEH, so we can't use VirtualQuery */ |
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# else |
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GC_bool GC_no_win32_dlls = FALSE; |
GC_bool GC_no_win32_dlls = FALSE; |
# endif |
/* This used to be set for gcc, to avoid dealing with */ |
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/* the structured exception handling issues. But we now have */ |
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/* assembly code to do that right. */ |
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void GC_init_win32() |
void GC_init_win32() |
{ |
{ |
Line 971 void GC_register_data_segments() |
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Line 1168 void GC_register_data_segments() |
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return(p); |
return(p); |
} |
} |
# endif |
# endif |
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# ifndef REDIRECT_MALLOC |
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/* We maintain a linked list of AllocationBase values that we know */ |
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/* correspond to malloc heap sections. Currently this is only called */ |
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/* during a GC. But there is some hope that for long running */ |
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/* programs we will eventually see most heap sections. */ |
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/* In the long run, it would be more reliable to occasionally walk */ |
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/* the malloc heap with HeapWalk on the default heap. But that */ |
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/* apparently works only for NT-based Windows. */ |
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/* In the long run, a better data structure would also be nice ... */ |
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struct GC_malloc_heap_list { |
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void * allocation_base; |
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struct GC_malloc_heap_list *next; |
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} *GC_malloc_heap_l = 0; |
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/* Is p the base of one of the malloc heap sections we already know */ |
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/* about? */ |
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GC_bool GC_is_malloc_heap_base(ptr_t p) |
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{ |
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struct GC_malloc_heap_list *q = GC_malloc_heap_l; |
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while (0 != q) { |
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if (q -> allocation_base == p) return TRUE; |
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q = q -> next; |
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} |
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return FALSE; |
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} |
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void *GC_get_allocation_base(void *p) |
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{ |
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MEMORY_BASIC_INFORMATION buf; |
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DWORD result = VirtualQuery(p, &buf, sizeof(buf)); |
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if (result != sizeof(buf)) { |
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ABORT("Weird VirtualQuery result"); |
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} |
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return buf.AllocationBase; |
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} |
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size_t GC_max_root_size = 100000; /* Appr. largest root size. */ |
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void GC_add_current_malloc_heap() |
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{ |
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struct GC_malloc_heap_list *new_l = |
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malloc(sizeof(struct GC_malloc_heap_list)); |
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void * candidate = GC_get_allocation_base(new_l); |
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if (new_l == 0) return; |
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if (GC_is_malloc_heap_base(candidate)) { |
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/* Try a little harder to find malloc heap. */ |
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size_t req_size = 10000; |
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do { |
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void *p = malloc(req_size); |
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if (0 == p) { free(new_l); return; } |
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candidate = GC_get_allocation_base(p); |
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free(p); |
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req_size *= 2; |
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} while (GC_is_malloc_heap_base(candidate) |
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&& req_size < GC_max_root_size/10 && req_size < 500000); |
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if (GC_is_malloc_heap_base(candidate)) { |
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free(new_l); return; |
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} |
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} |
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# ifdef CONDPRINT |
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if (GC_print_stats) |
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GC_printf1("Found new system malloc AllocationBase at 0x%lx\n", |
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candidate); |
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# endif |
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new_l -> allocation_base = candidate; |
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new_l -> next = GC_malloc_heap_l; |
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GC_malloc_heap_l = new_l; |
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} |
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# endif /* REDIRECT_MALLOC */ |
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/* Is p the start of either the malloc heap, or of one of our */ |
/* Is p the start of either the malloc heap, or of one of our */ |
/* heap sections? */ |
/* heap sections? */ |
GC_bool GC_is_heap_base (ptr_t p) |
GC_bool GC_is_heap_base (ptr_t p) |
{ |
{ |
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register unsigned i; |
unsigned i; |
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# ifndef REDIRECT_MALLOC |
# ifndef REDIRECT_MALLOC |
static ptr_t malloc_heap_pointer = 0; |
static word last_gc_no = -1; |
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if (0 == malloc_heap_pointer) { |
if (last_gc_no != GC_gc_no) { |
MEMORY_BASIC_INFORMATION buf; |
GC_add_current_malloc_heap(); |
void *pTemp = malloc( 1 ); |
last_gc_no = GC_gc_no; |
register DWORD result = VirtualQuery(pTemp, &buf, sizeof(buf)); |
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free( pTemp ); |
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if (result != sizeof(buf)) { |
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ABORT("Weird VirtualQuery result"); |
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} |
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malloc_heap_pointer = (ptr_t)(buf.AllocationBase); |
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} |
} |
if (p == malloc_heap_pointer) return(TRUE); |
if (GC_root_size > GC_max_root_size) GC_max_root_size = GC_root_size; |
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if (GC_is_malloc_heap_base(p)) return TRUE; |
# endif |
# endif |
for (i = 0; i < GC_n_heap_bases; i++) { |
for (i = 0; i < GC_n_heap_bases; i++) { |
if (GC_heap_bases[i] == p) return(TRUE); |
if (GC_heap_bases[i] == p) return TRUE; |
} |
} |
return(FALSE); |
return FALSE ; |
} |
} |
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# ifdef MSWIN32 |
# ifdef MSWIN32 |
Line 1050 void GC_register_data_segments() |
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Line 1313 void GC_register_data_segments() |
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# if (defined(SVR4) || defined(AUX) || defined(DGUX) \ |
# if (defined(SVR4) || defined(AUX) || defined(DGUX) \ |
|| (defined(LINUX) && defined(SPARC))) && !defined(PCR) |
|| (defined(LINUX) && defined(SPARC))) && !defined(PCR) |
char * GC_SysVGetDataStart(max_page_size, etext_addr) |
ptr_t GC_SysVGetDataStart(max_page_size, etext_addr) |
int max_page_size; |
int max_page_size; |
int * etext_addr; |
int * etext_addr; |
{ |
{ |
Line 1076 int * etext_addr; |
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Line 1339 int * etext_addr; |
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/* string constants in the text segment, but after etext. */ |
/* string constants in the text segment, but after etext. */ |
/* Use plan B. Note that we now know there is a gap between */ |
/* Use plan B. Note that we now know there is a gap between */ |
/* text and data segments, so plan A bought us something. */ |
/* text and data segments, so plan A bought us something. */ |
result = (char *)GC_find_limit((ptr_t)(DATAEND) - MIN_PAGE_SIZE, FALSE); |
result = (char *)GC_find_limit((ptr_t)(DATAEND), FALSE); |
} |
} |
return((char *)result); |
return((ptr_t)result); |
} |
} |
# endif |
# endif |
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// # if defined(FREEBSD) && defined(I386) && !defined(PCR) |
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# if defined(FREEBSD) && ( defined(I386) || defined(X86_64) ) && !defined(PCR) |
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/* Its unclear whether this should be identical to the above, or */ |
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/* whether it should apply to non-X86 architectures. */ |
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/* For now we don't assume that there is always an empty page after */ |
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/* etext. But in some cases there actually seems to be slightly more. */ |
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/* This also deals with holes between read-only data and writable data. */ |
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ptr_t GC_FreeBSDGetDataStart(max_page_size, etext_addr) |
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int max_page_size; |
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int * etext_addr; |
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{ |
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word text_end = ((word)(etext_addr) + sizeof(word) - 1) |
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& ~(sizeof(word) - 1); |
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/* etext rounded to word boundary */ |
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VOLATILE word next_page = (text_end + (word)max_page_size - 1) |
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& ~((word)max_page_size - 1); |
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VOLATILE ptr_t result = (ptr_t)text_end; |
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GC_setup_temporary_fault_handler(); |
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if (setjmp(GC_jmp_buf) == 0) { |
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/* Try reading at the address. */ |
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/* This should happen before there is another thread. */ |
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for (; next_page < (word)(DATAEND); next_page += (word)max_page_size) |
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*(VOLATILE char *)next_page; |
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GC_reset_fault_handler(); |
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} else { |
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GC_reset_fault_handler(); |
|
/* As above, we go to plan B */ |
|
result = GC_find_limit((ptr_t)(DATAEND), FALSE); |
|
} |
|
return(result); |
|
} |
|
|
|
# endif |
|
|
|
|
#ifdef AMIGA |
#ifdef AMIGA |
|
|
# define GC_AMIGA_DS |
# define GC_AMIGA_DS |
Line 1093 int * etext_addr; |
|
Line 1390 int * etext_addr; |
|
|
|
void GC_register_data_segments() |
void GC_register_data_segments() |
{ |
{ |
# if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS) \ |
# if !defined(PCR) && !defined(SRC_M3) && !defined(MACOS) |
&& !defined(MACOSX) |
|
# if defined(REDIRECT_MALLOC) && defined(GC_SOLARIS_THREADS) |
# if defined(REDIRECT_MALLOC) && defined(GC_SOLARIS_THREADS) |
/* As of Solaris 2.3, the Solaris threads implementation */ |
/* As of Solaris 2.3, the Solaris threads implementation */ |
/* allocates the data structure for the initial thread with */ |
/* allocates the data structure for the initial thread with */ |
Line 1111 void GC_register_data_segments() |
|
Line 1407 void GC_register_data_segments() |
|
# endif |
# endif |
# endif |
# endif |
# endif |
# endif |
# if !defined(PCR) && (defined(NEXT) || defined(MACOSX)) |
|
GC_add_roots_inner(DATASTART, (char *) get_end(), FALSE); |
|
# endif |
|
# if defined(MACOS) |
# if defined(MACOS) |
{ |
{ |
# if defined(THINK_C) |
# if defined(THINK_C) |
|
|
ptr_t GC_unix_get_mem(bytes) |
ptr_t GC_unix_get_mem(bytes) |
word bytes; |
word bytes; |
{ |
{ |
static GC_bool initialized = FALSE; |
|
static int fd; |
|
void *result; |
void *result; |
static ptr_t last_addr = HEAP_START; |
static ptr_t last_addr = HEAP_START; |
|
|
if (!initialized) { |
# ifndef USE_MMAP_ANON |
fd = open("/dev/zero", O_RDONLY); |
static GC_bool initialized = FALSE; |
initialized = TRUE; |
static int fd; |
} |
|
|
if (!initialized) { |
|
fd = open("/dev/zero", O_RDONLY); |
|
fcntl(fd, F_SETFD, FD_CLOEXEC); |
|
initialized = TRUE; |
|
} |
|
# endif |
|
|
if (bytes & (GC_page_size -1)) ABORT("Bad GET_MEM arg"); |
if (bytes & (GC_page_size -1)) ABORT("Bad GET_MEM arg"); |
result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC, |
# ifdef USE_MMAP_ANON |
GC_MMAP_FLAGS, fd, 0/* offset */); |
result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC, |
|
GC_MMAP_FLAGS | MAP_ANON, -1, 0/* offset */); |
|
# else |
|
result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC, |
|
GC_MMAP_FLAGS, fd, 0/* offset */); |
|
# endif |
if (result == MAP_FAILED) return(0); |
if (result == MAP_FAILED) return(0); |
last_addr = (ptr_t)result + bytes + GC_page_size - 1; |
last_addr = (ptr_t)result + bytes + GC_page_size - 1; |
last_addr = (ptr_t)((word)last_addr & ~(GC_page_size - 1)); |
last_addr = (ptr_t)((word)last_addr & ~(GC_page_size - 1)); |
Line 1527 void GC_remap(ptr_t start, word bytes) |
|
Line 1830 void GC_remap(ptr_t start, word bytes) |
|
} |
} |
# else |
# else |
if (-1 == zero_descr) zero_descr = open("/dev/zero", O_RDWR); |
if (-1 == zero_descr) zero_descr = open("/dev/zero", O_RDWR); |
|
fcntl(zero_descr, F_SETFD, FD_CLOEXEC); |
if (0 == start_addr) return; |
if (0 == start_addr) return; |
result = mmap(start_addr, len, PROT_READ | PROT_WRITE | OPT_PROT_EXEC, |
result = mmap(start_addr, len, PROT_READ | PROT_WRITE | OPT_PROT_EXEC, |
MAP_FIXED | MAP_PRIVATE, zero_descr, 0); |
MAP_FIXED | MAP_PRIVATE, zero_descr, 0); |
Line 1713 void (*GC_push_other_roots) GC_PROTO((void)) = GC_defa |
|
Line 2017 void (*GC_push_other_roots) GC_PROTO((void)) = GC_defa |
|
* make sure that other system calls are similarly protected |
* make sure that other system calls are similarly protected |
* or write only to the stack. |
* or write only to the stack. |
*/ |
*/ |
|
|
GC_bool GC_dirty_maintained = FALSE; |
GC_bool GC_dirty_maintained = FALSE; |
|
|
# ifdef DEFAULT_VDB |
# ifdef DEFAULT_VDB |
Line 1727 GC_bool GC_dirty_maintained = FALSE; |
|
Line 2030 GC_bool GC_dirty_maintained = FALSE; |
|
/* Initialize virtual dirty bit implementation. */ |
/* Initialize virtual dirty bit implementation. */ |
void GC_dirty_init() |
void GC_dirty_init() |
{ |
{ |
|
# ifdef PRINTSTATS |
|
GC_printf0("Initializing DEFAULT_VDB...\n"); |
|
# endif |
GC_dirty_maintained = TRUE; |
GC_dirty_maintained = TRUE; |
} |
} |
|
|
Line 1809 GC_bool is_ptrfree; |
|
Line 2115 GC_bool is_ptrfree; |
|
* objects only if they are the same. |
* objects only if they are the same. |
*/ |
*/ |
|
|
# if !defined(MSWIN32) && !defined(MSWINCE) |
# if !defined(MSWIN32) && !defined(MSWINCE) && !defined(DARWIN) |
|
|
# include <sys/mman.h> |
# include <sys/mman.h> |
# include <signal.h> |
# include <signal.h> |
Line 1828 GC_bool is_ptrfree; |
|
Line 2134 GC_bool is_ptrfree; |
|
|
|
# else |
# else |
|
|
|
# ifdef DARWIN |
|
/* Using vm_protect (mach syscall) over mprotect (BSD syscall) seems to |
|
decrease the likelihood of some of the problems described below. */ |
|
#include <mach/vm_map.h> |
|
extern mach_port_t GC_task_self; |
|
#define PROTECT(addr,len) \ |
|
if(vm_protect(GC_task_self,(vm_address_t)(addr),(vm_size_t)(len), \ |
|
FALSE,VM_PROT_READ) != KERN_SUCCESS) { \ |
|
ABORT("vm_portect failed"); \ |
|
} |
|
#define UNPROTECT(addr,len) \ |
|
if(vm_protect(GC_task_self,(vm_address_t)(addr),(vm_size_t)(len), \ |
|
FALSE,VM_PROT_READ|VM_PROT_WRITE) != KERN_SUCCESS) { \ |
|
ABORT("vm_portect failed"); \ |
|
} |
|
# else |
|
|
# ifndef MSWINCE |
# ifndef MSWINCE |
# include <signal.h> |
# include <signal.h> |
# endif |
# endif |
Line 1845 GC_bool is_ptrfree; |
|
Line 2168 GC_bool is_ptrfree; |
|
&protect_junk)) { \ |
&protect_junk)) { \ |
ABORT("un-VirtualProtect failed"); \ |
ABORT("un-VirtualProtect failed"); \ |
} |
} |
|
# endif /* !DARWIN */ |
# endif |
# endif /* MSWIN32 || MSWINCE || DARWIN */ |
|
|
#if defined(SUNOS4) || defined(FREEBSD) |
#if defined(SUNOS4) || defined(FREEBSD) |
typedef void (* SIG_PF)(); |
typedef void (* SIG_PF)(); |
#endif |
#endif /* SUNOS4 || FREEBSD */ |
|
|
#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) \ |
#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) \ |
|| defined(MACOSX) || defined(HURD) |
|| defined(HURD) |
# ifdef __STDC__ |
# ifdef __STDC__ |
typedef void (* SIG_PF)(int); |
typedef void (* SIG_PF)(int); |
# else |
# else |
typedef void (* SIG_PF)(); |
typedef void (* SIG_PF)(); |
# endif |
# endif |
#endif |
#endif /* SUNOS5SIGS || OSF1 || LINUX || HURD */ |
|
|
#if defined(MSWIN32) |
#if defined(MSWIN32) |
typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF; |
typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF; |
# undef SIG_DFL |
# undef SIG_DFL |
Line 1872 GC_bool is_ptrfree; |
|
Line 2197 GC_bool is_ptrfree; |
|
|
|
#if defined(IRIX5) || defined(OSF1) || defined(HURD) |
#if defined(IRIX5) || defined(OSF1) || defined(HURD) |
typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *); |
typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *); |
#endif |
#endif /* IRIX5 || OSF1 || HURD */ |
|
|
#if defined(SUNOS5SIGS) |
#if defined(SUNOS5SIGS) |
# ifdef HPUX |
# ifdef HPUX |
# define SIGINFO __siginfo |
# define SIGINFO __siginfo |
Line 1884 GC_bool is_ptrfree; |
|
Line 2210 GC_bool is_ptrfree; |
|
# else |
# else |
typedef void (* REAL_SIG_PF)(); |
typedef void (* REAL_SIG_PF)(); |
# endif |
# endif |
#endif |
#endif /* SUNOS5SIGS */ |
|
|
#if defined(LINUX) |
#if defined(LINUX) |
# if __GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 |
# if __GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 |
typedef struct sigcontext s_c; |
typedef struct sigcontext s_c; |
Line 1918 GC_bool is_ptrfree; |
|
Line 2245 GC_bool is_ptrfree; |
|
return (char *)faultaddr; |
return (char *)faultaddr; |
} |
} |
# endif /* !ALPHA */ |
# endif /* !ALPHA */ |
# endif |
# endif /* LINUX */ |
|
|
# if defined(MACOSX) /* Should also test for PowerPC? */ |
#ifndef DARWIN |
typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *); |
|
|
|
/* Decodes the machine instruction which was responsible for the sending of the |
|
SIGBUS signal. Sadly this is the only way to find the faulting address because |
|
the signal handler doesn't get it directly from the kernel (although it is |
|
available on the Mach level, but droppped by the BSD personality before it |
|
calls our signal handler...) |
|
This code should be able to deal correctly with all PPCs starting from the |
|
601 up to and including the G4s (including Velocity Engine). */ |
|
#define EXTRACT_OP1(iw) (((iw) & 0xFC000000) >> 26) |
|
#define EXTRACT_OP2(iw) (((iw) & 0x000007FE) >> 1) |
|
#define EXTRACT_REGA(iw) (((iw) & 0x001F0000) >> 16) |
|
#define EXTRACT_REGB(iw) (((iw) & 0x03E00000) >> 21) |
|
#define EXTRACT_REGC(iw) (((iw) & 0x0000F800) >> 11) |
|
#define EXTRACT_DISP(iw) ((short *) &(iw))[1] |
|
|
|
static char *get_fault_addr(struct sigcontext *scp) |
|
{ |
|
unsigned int instr = *((unsigned int *) scp->sc_ir); |
|
unsigned int * regs = &((unsigned int *) scp->sc_regs)[2]; |
|
int disp = 0, tmp; |
|
unsigned int baseA = 0, baseB = 0; |
|
unsigned int addr, alignmask = 0xFFFFFFFF; |
|
|
|
#ifdef GC_DEBUG_DECODER |
|
GC_err_printf1("Instruction: 0x%lx\n", instr); |
|
GC_err_printf1("Opcode 1: d\n", (int)EXTRACT_OP1(instr)); |
|
#endif |
|
switch(EXTRACT_OP1(instr)) { |
|
case 38: /* stb */ |
|
case 39: /* stbu */ |
|
case 54: /* stfd */ |
|
case 55: /* stfdu */ |
|
case 52: /* stfs */ |
|
case 53: /* stfsu */ |
|
case 44: /* sth */ |
|
case 45: /* sthu */ |
|
case 47: /* stmw */ |
|
case 36: /* stw */ |
|
case 37: /* stwu */ |
|
tmp = EXTRACT_REGA(instr); |
|
if(tmp > 0) |
|
baseA = regs[tmp]; |
|
disp = EXTRACT_DISP(instr); |
|
break; |
|
case 31: |
|
#ifdef GC_DEBUG_DECODER |
|
GC_err_printf1("Opcode 2: %d\n", (int)EXTRACT_OP2(instr)); |
|
#endif |
|
switch(EXTRACT_OP2(instr)) { |
|
case 86: /* dcbf */ |
|
case 54: /* dcbst */ |
|
case 1014: /* dcbz */ |
|
case 247: /* stbux */ |
|
case 215: /* stbx */ |
|
case 759: /* stfdux */ |
|
case 727: /* stfdx */ |
|
case 983: /* stfiwx */ |
|
case 695: /* stfsux */ |
|
case 663: /* stfsx */ |
|
case 918: /* sthbrx */ |
|
case 439: /* sthux */ |
|
case 407: /* sthx */ |
|
case 661: /* stswx */ |
|
case 662: /* stwbrx */ |
|
case 150: /* stwcx. */ |
|
case 183: /* stwux */ |
|
case 151: /* stwx */ |
|
case 135: /* stvebx */ |
|
case 167: /* stvehx */ |
|
case 199: /* stvewx */ |
|
case 231: /* stvx */ |
|
case 487: /* stvxl */ |
|
tmp = EXTRACT_REGA(instr); |
|
if(tmp > 0) |
|
baseA = regs[tmp]; |
|
baseB = regs[EXTRACT_REGC(instr)]; |
|
/* determine Altivec alignment mask */ |
|
switch(EXTRACT_OP2(instr)) { |
|
case 167: /* stvehx */ |
|
alignmask = 0xFFFFFFFE; |
|
break; |
|
case 199: /* stvewx */ |
|
alignmask = 0xFFFFFFFC; |
|
break; |
|
case 231: /* stvx */ |
|
alignmask = 0xFFFFFFF0; |
|
break; |
|
case 487: /* stvxl */ |
|
alignmask = 0xFFFFFFF0; |
|
break; |
|
} |
|
break; |
|
case 725: /* stswi */ |
|
tmp = EXTRACT_REGA(instr); |
|
if(tmp > 0) |
|
baseA = regs[tmp]; |
|
break; |
|
default: /* ignore instruction */ |
|
#ifdef GC_DEBUG_DECODER |
|
GC_err_printf("Ignored by inner handler\n"); |
|
#endif |
|
return NULL; |
|
break; |
|
} |
|
break; |
|
default: /* ignore instruction */ |
|
#ifdef GC_DEBUG_DECODER |
|
GC_err_printf("Ignored by main handler\n"); |
|
#endif |
|
return NULL; |
|
break; |
|
} |
|
|
|
addr = (baseA + baseB) + disp; |
|
addr &= alignmask; |
|
#ifdef GC_DEBUG_DECODER |
|
GC_err_printf1("BaseA: %d\n", baseA); |
|
GC_err_printf1("BaseB: %d\n", baseB); |
|
GC_err_printf1("Disp: %d\n", disp); |
|
GC_err_printf1("Address: %d\n", addr); |
|
#endif |
|
return (char *)addr; |
|
} |
|
#endif /* MACOSX */ |
|
|
|
SIG_PF GC_old_bus_handler; |
SIG_PF GC_old_bus_handler; |
SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ |
SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ |
|
#endif /* !DARWIN */ |
|
|
#ifdef THREADS |
#if defined(THREADS) |
/* We need to lock around the bitmap update in the write fault handler */ |
/* We need to lock around the bitmap update in the write fault handler */ |
/* in order to avoid the risk of losing a bit. We do this with a */ |
/* in order to avoid the risk of losing a bit. We do this with a */ |
/* test-and-set spin lock if we know how to do that. Otherwise we */ |
/* test-and-set spin lock if we know how to do that. Otherwise we */ |
Line 2099 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2301 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
#endif /* !THREADS */ |
#endif /* !THREADS */ |
|
|
/*ARGSUSED*/ |
/*ARGSUSED*/ |
|
#if !defined(DARWIN) |
# if defined (SUNOS4) || defined(FREEBSD) |
# if defined (SUNOS4) || defined(FREEBSD) |
void GC_write_fault_handler(sig, code, scp, addr) |
void GC_write_fault_handler(sig, code, scp, addr) |
int sig, code; |
int sig, code; |
Line 2114 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2317 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
# define SIG_OK (sig == SIGBUS) |
# define SIG_OK (sig == SIGBUS) |
# define CODE_OK (code == BUS_PAGE_FAULT) |
# define CODE_OK (code == BUS_PAGE_FAULT) |
# endif |
# endif |
# endif |
# endif /* SUNOS4 || FREEBSD */ |
|
|
# if defined(IRIX5) || defined(OSF1) || defined(HURD) |
# if defined(IRIX5) || defined(OSF1) || defined(HURD) |
# include <errno.h> |
# include <errno.h> |
void GC_write_fault_handler(int sig, int code, struct sigcontext *scp) |
void GC_write_fault_handler(int sig, int code, struct sigcontext *scp) |
Line 2130 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2334 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
# define SIG_OK (sig == SIGBUS || sig == SIGSEGV) |
# define SIG_OK (sig == SIGBUS || sig == SIGSEGV) |
# define CODE_OK TRUE |
# define CODE_OK TRUE |
# endif |
# endif |
# endif |
# endif /* IRIX5 || OSF1 || HURD */ |
|
|
# if defined(LINUX) |
# if defined(LINUX) |
# if defined(ALPHA) || defined(M68K) |
# if defined(ALPHA) || defined(M68K) |
void GC_write_fault_handler(int sig, int code, s_c * sc) |
void GC_write_fault_handler(int sig, int code, s_c * sc) |
Line 2150 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2355 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
/* Empirically c.trapno == 14, on IA32, but is that useful? */ |
/* Empirically c.trapno == 14, on IA32, but is that useful? */ |
/* Should probably consider alignment issues on other */ |
/* Should probably consider alignment issues on other */ |
/* architectures. */ |
/* architectures. */ |
# endif |
# endif /* LINUX */ |
|
|
# if defined(SUNOS5SIGS) |
# if defined(SUNOS5SIGS) |
# ifdef __STDC__ |
# ifdef __STDC__ |
void GC_write_fault_handler(int sig, struct SIGINFO *scp, void * context) |
void GC_write_fault_handler(int sig, struct SIGINFO *scp, void * context) |
Line 2171 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2377 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
# define SIG_OK (sig == SIGSEGV) |
# define SIG_OK (sig == SIGSEGV) |
# define CODE_OK (scp -> si_code == SEGV_ACCERR) |
# define CODE_OK (scp -> si_code == SEGV_ACCERR) |
# endif |
# endif |
# endif |
# endif /* SUNOS5SIGS */ |
|
|
# if defined(MACOSX) |
|
void GC_write_fault_handler(int sig, int code, struct sigcontext *scp) |
|
# define SIG_OK (sig == SIGBUS) |
|
# define CODE_OK (code == 0 /* experimentally determined */) |
|
# endif |
|
|
|
# if defined(MSWIN32) || defined(MSWINCE) |
# if defined(MSWIN32) || defined(MSWINCE) |
LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info) |
LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info) |
# define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \ |
# define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \ |
STATUS_ACCESS_VIOLATION) |
STATUS_ACCESS_VIOLATION) |
# define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1) |
# define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1) |
/* Write fault */ |
/* Write fault */ |
# endif |
# endif /* MSWIN32 || MSWINCE */ |
{ |
{ |
register unsigned i; |
register unsigned i; |
# if defined(HURD) |
# if defined(HURD) |
Line 2201 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2401 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
char * addr = (char *) (scp -> si_addr); |
char * addr = (char *) (scp -> si_addr); |
# endif |
# endif |
# ifdef LINUX |
# ifdef LINUX |
# ifdef I386 |
# if defined(I386) || defined (X86_64) |
char * addr = (char *) (sc.cr2); |
char * addr = (char *) (sc.cr2); |
# else |
# else |
# if defined(M68K) |
# if defined(M68K) |
Line 2256 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2456 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
# endif |
# endif |
# endif |
# endif |
# endif |
# endif |
# if defined(MACOSX) |
|
char * addr = get_fault_addr(scp); |
|
# endif |
|
# if defined(MSWIN32) || defined(MSWINCE) |
# if defined(MSWIN32) || defined(MSWINCE) |
char * addr = (char *) (exc_info -> ExceptionRecord |
char * addr = (char *) (exc_info -> ExceptionRecord |
-> ExceptionInformation[1]); |
-> ExceptionInformation[1]); |
Line 2322 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2519 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
(*(REAL_SIG_PF)old_handler) (sig, code, scp); |
(*(REAL_SIG_PF)old_handler) (sig, code, scp); |
return; |
return; |
# endif |
# endif |
# ifdef MACOSX |
|
(*(REAL_SIG_PF)old_handler) (sig, code, scp); |
|
# endif |
|
# ifdef MSWIN32 |
# ifdef MSWIN32 |
return((*old_handler)(exc_info)); |
return((*old_handler)(exc_info)); |
# endif |
# endif |
Line 2366 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
Line 2560 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS |
|
ABORT("Unexpected bus error or segmentation fault"); |
ABORT("Unexpected bus error or segmentation fault"); |
#endif |
#endif |
} |
} |
|
#endif /* !DARWIN */ |
|
|
/* |
/* |
* We hold the allocation lock. We expect block h to be written |
* We hold the allocation lock. We expect block h to be written |
Line 2398 GC_bool is_ptrfree; |
|
Line 2593 GC_bool is_ptrfree; |
|
UNPROTECT(h_trunc, (ptr_t)h_end - (ptr_t)h_trunc); |
UNPROTECT(h_trunc, (ptr_t)h_end - (ptr_t)h_trunc); |
} |
} |
|
|
|
#if !defined(DARWIN) |
void GC_dirty_init() |
void GC_dirty_init() |
{ |
{ |
# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(LINUX) || \ |
# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(LINUX) || \ |
Line 2420 void GC_dirty_init() |
|
Line 2616 void GC_dirty_init() |
|
(void)sigaddset(&act.sa_mask, SIG_SUSPEND); |
(void)sigaddset(&act.sa_mask, SIG_SUSPEND); |
# endif /* SIG_SUSPEND */ |
# endif /* SIG_SUSPEND */ |
# endif |
# endif |
# if defined(MACOSX) |
|
struct sigaction act, oldact; |
|
|
|
act.sa_flags = SA_RESTART; |
|
act.sa_handler = GC_write_fault_handler; |
|
sigemptyset(&act.sa_mask); |
|
# endif |
|
# ifdef PRINTSTATS |
# ifdef PRINTSTATS |
GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n"); |
GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n"); |
# endif |
# endif |
Line 2466 void GC_dirty_init() |
|
Line 2655 void GC_dirty_init() |
|
sigaction(SIGSEGV, 0, &oldact); |
sigaction(SIGSEGV, 0, &oldact); |
sigaction(SIGSEGV, &act, 0); |
sigaction(SIGSEGV, &act, 0); |
# else |
# else |
sigaction(SIGSEGV, &act, &oldact); |
{ |
|
int res = sigaction(SIGSEGV, &act, &oldact); |
|
if (res != 0) ABORT("Sigaction failed"); |
|
} |
# endif |
# endif |
# if defined(_sigargs) || defined(HURD) || !defined(SA_SIGINFO) |
# if defined(_sigargs) || defined(HURD) || !defined(SA_SIGINFO) |
/* This is Irix 5.x, not 6.x. Irix 5.x does not have */ |
/* This is Irix 5.x, not 6.x. Irix 5.x does not have */ |
Line 2489 void GC_dirty_init() |
|
Line 2681 void GC_dirty_init() |
|
# endif |
# endif |
} |
} |
# endif |
# endif |
# if defined(MACOSX) || defined(HPUX) || defined(LINUX) || defined(HURD) |
# if defined(HPUX) || defined(LINUX) || defined(HURD) |
sigaction(SIGBUS, &act, &oldact); |
sigaction(SIGBUS, &act, &oldact); |
GC_old_bus_handler = oldact.sa_handler; |
GC_old_bus_handler = oldact.sa_handler; |
if (GC_old_bus_handler == SIG_IGN) { |
if (GC_old_bus_handler == SIG_IGN) { |
Line 2501 void GC_dirty_init() |
|
Line 2693 void GC_dirty_init() |
|
GC_err_printf0("Replaced other SIGBUS handler\n"); |
GC_err_printf0("Replaced other SIGBUS handler\n"); |
# endif |
# endif |
} |
} |
# endif /* MACOS || HPUX || LINUX */ |
# endif /* HPUX || LINUX || HURD */ |
# if defined(MSWIN32) |
# if defined(MSWIN32) |
GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler); |
GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler); |
if (GC_old_segv_handler != NULL) { |
if (GC_old_segv_handler != NULL) { |
Line 2513 void GC_dirty_init() |
|
Line 2705 void GC_dirty_init() |
|
} |
} |
# endif |
# endif |
} |
} |
|
#endif /* !DARWIN */ |
|
|
int GC_incremental_protection_needs() |
int GC_incremental_protection_needs() |
{ |
{ |
|
|
{ |
{ |
} |
} |
|
|
# else /* !MPROTECT_VDB */ |
|
|
|
# ifdef GC_USE_LD_WRAP |
|
ssize_t __wrap_read(int fd, void *buf, size_t nbyte) |
|
{ return __real_read(fd, buf, nbyte); } |
|
# endif |
|
|
|
# endif /* MPROTECT_VDB */ |
# endif /* MPROTECT_VDB */ |
|
|
# ifdef PROC_VDB |
# ifdef PROC_VDB |
Line 2847 void GC_dirty_init() |
|
Line 3033 void GC_dirty_init() |
|
} |
} |
GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0); |
GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0); |
close(fd); |
close(fd); |
|
syscall(SYS_fcntl, GC_proc_fd, F_SETFD, FD_CLOEXEC); |
if (GC_proc_fd < 0) { |
if (GC_proc_fd < 0) { |
ABORT("/proc ioctl failed"); |
ABORT("/proc ioctl failed"); |
} |
} |
Line 3086 GC_bool is_ptrfree; |
|
Line 3273 GC_bool is_ptrfree; |
|
|
|
# endif /* PCR_VDB */ |
# endif /* PCR_VDB */ |
|
|
|
#if defined(MPROTECT_VDB) && defined(DARWIN) |
|
/* The following sources were used as a *reference* for this exception handling |
|
code: |
|
1. Apple's mach/xnu documentation |
|
2. Timothy J. Wood's "Mach Exception Handlers 101" post to the |
|
omnigroup's macosx-dev list. |
|
www.omnigroup.com/mailman/archive/macosx-dev/2000-June/002030.html |
|
3. macosx-nat.c from Apple's GDB source code. |
|
*/ |
|
|
|
/* There seem to be numerous problems with darwin's mach exception handling. |
|
I'm pretty sure they are not problems in my code. Search for |
|
BROKEN_EXCEPTION_HANDLING for more information. */ |
|
#define BROKEN_EXCEPTION_HANDLING |
|
|
|
#include <mach/mach.h> |
|
#include <mach/mach_error.h> |
|
#include <mach/thread_status.h> |
|
#include <mach/exception.h> |
|
#include <mach/task.h> |
|
#include <pthread.h> |
|
|
|
/* These are not defined in any header, although they are documented */ |
|
extern boolean_t exc_server(mach_msg_header_t *,mach_msg_header_t *); |
|
extern kern_return_t exception_raise( |
|
mach_port_t,mach_port_t,mach_port_t, |
|
exception_type_t,exception_data_t,mach_msg_type_number_t); |
|
extern kern_return_t exception_raise_state( |
|
mach_port_t,mach_port_t,mach_port_t, |
|
exception_type_t,exception_data_t,mach_msg_type_number_t, |
|
thread_state_flavor_t*,thread_state_t,mach_msg_type_number_t, |
|
thread_state_t,mach_msg_type_number_t*); |
|
extern kern_return_t exception_raise_state_identity( |
|
mach_port_t,mach_port_t,mach_port_t, |
|
exception_type_t,exception_data_t,mach_msg_type_number_t, |
|
thread_state_flavor_t*,thread_state_t,mach_msg_type_number_t, |
|
thread_state_t,mach_msg_type_number_t*); |
|
|
|
|
|
#define MAX_EXCEPTION_PORTS 16 |
|
|
|
static mach_port_t GC_task_self; |
|
|
|
static struct { |
|
mach_msg_type_number_t count; |
|
exception_mask_t masks[MAX_EXCEPTION_PORTS]; |
|
exception_handler_t ports[MAX_EXCEPTION_PORTS]; |
|
exception_behavior_t behaviors[MAX_EXCEPTION_PORTS]; |
|
thread_state_flavor_t flavors[MAX_EXCEPTION_PORTS]; |
|
} GC_old_exc_ports; |
|
|
|
static struct { |
|
mach_port_t exception; |
|
#if defined(THREADS) |
|
mach_port_t reply; |
|
#endif |
|
} GC_ports; |
|
|
|
typedef struct { |
|
mach_msg_header_t head; |
|
} GC_msg_t; |
|
|
|
typedef enum { |
|
GC_MP_NORMAL, GC_MP_DISCARDING, GC_MP_STOPPED |
|
} GC_mprotect_state_t; |
|
|
|
/* FIXME: 1 and 2 seem to be safe to use in the msgh_id field, |
|
but it isn't documented. Use the source and see if they |
|
should be ok. */ |
|
#define ID_STOP 1 |
|
#define ID_RESUME 2 |
|
|
|
/* These values are only used on the reply port */ |
|
#define ID_ACK 3 |
|
|
|
#if defined(THREADS) |
|
|
|
GC_mprotect_state_t GC_mprotect_state; |
|
|
|
/* The following should ONLY be called when the world is stopped */ |
|
static void GC_mprotect_thread_notify(mach_msg_id_t id) { |
|
struct { |
|
GC_msg_t msg; |
|
mach_msg_trailer_t trailer; |
|
} buf; |
|
mach_msg_return_t r; |
|
/* remote, local */ |
|
buf.msg.head.msgh_bits = |
|
MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND,0); |
|
buf.msg.head.msgh_size = sizeof(buf.msg); |
|
buf.msg.head.msgh_remote_port = GC_ports.exception; |
|
buf.msg.head.msgh_local_port = MACH_PORT_NULL; |
|
buf.msg.head.msgh_id = id; |
|
|
|
r = mach_msg( |
|
&buf.msg.head, |
|
MACH_SEND_MSG|MACH_RCV_MSG|MACH_RCV_LARGE, |
|
sizeof(buf.msg), |
|
sizeof(buf), |
|
GC_ports.reply, |
|
MACH_MSG_TIMEOUT_NONE, |
|
MACH_PORT_NULL); |
|
if(r != MACH_MSG_SUCCESS) |
|
ABORT("mach_msg failed in GC_mprotect_thread_notify"); |
|
if(buf.msg.head.msgh_id != ID_ACK) |
|
ABORT("invalid ack in GC_mprotect_thread_notify"); |
|
} |
|
|
|
/* Should only be called by the mprotect thread */ |
|
static void GC_mprotect_thread_reply() { |
|
GC_msg_t msg; |
|
mach_msg_return_t r; |
|
/* remote, local */ |
|
msg.head.msgh_bits = |
|
MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND,0); |
|
msg.head.msgh_size = sizeof(msg); |
|
msg.head.msgh_remote_port = GC_ports.reply; |
|
msg.head.msgh_local_port = MACH_PORT_NULL; |
|
msg.head.msgh_id = ID_ACK; |
|
|
|
r = mach_msg( |
|
&msg.head, |
|
MACH_SEND_MSG, |
|
sizeof(msg), |
|
0, |
|
MACH_PORT_NULL, |
|
MACH_MSG_TIMEOUT_NONE, |
|
MACH_PORT_NULL); |
|
if(r != MACH_MSG_SUCCESS) |
|
ABORT("mach_msg failed in GC_mprotect_thread_reply"); |
|
} |
|
|
|
void GC_mprotect_stop() { |
|
GC_mprotect_thread_notify(ID_STOP); |
|
} |
|
void GC_mprotect_resume() { |
|
GC_mprotect_thread_notify(ID_RESUME); |
|
} |
|
|
|
#else /* !THREADS */ |
|
/* The compiler should optimize away any GC_mprotect_state computations */ |
|
#define GC_mprotect_state GC_MP_NORMAL |
|
#endif |
|
|
|
static void *GC_mprotect_thread(void *arg) { |
|
mach_msg_return_t r; |
|
/* These two structures contain some private kernel data. We don't need to |
|
access any of it so we don't bother defining a proper struct. The |
|
correct definitions are in the xnu source code. */ |
|
struct { |
|
mach_msg_header_t head; |
|
char data[256]; |
|
} reply; |
|
struct { |
|
mach_msg_header_t head; |
|
mach_msg_body_t msgh_body; |
|
char data[1024]; |
|
} msg; |
|
|
|
mach_msg_id_t id; |
|
|
|
for(;;) { |
|
r = mach_msg( |
|
&msg.head, |
|
MACH_RCV_MSG|MACH_RCV_LARGE| |
|
(GC_mprotect_state == GC_MP_DISCARDING ? MACH_RCV_TIMEOUT : 0), |
|
0, |
|
sizeof(msg), |
|
GC_ports.exception, |
|
GC_mprotect_state == GC_MP_DISCARDING ? 0 : MACH_MSG_TIMEOUT_NONE, |
|
MACH_PORT_NULL); |
|
|
|
id = r == MACH_MSG_SUCCESS ? msg.head.msgh_id : -1; |
|
|
|
#if defined(THREADS) |
|
if(GC_mprotect_state == GC_MP_DISCARDING) { |
|
if(r == MACH_RCV_TIMED_OUT) { |
|
GC_mprotect_state = GC_MP_STOPPED; |
|
GC_mprotect_thread_reply(); |
|
continue; |
|
} |
|
if(r == MACH_MSG_SUCCESS && (id == ID_STOP || id == ID_RESUME)) |
|
ABORT("out of order mprotect thread request"); |
|
} |
|
#endif |
|
|
|
if(r != MACH_MSG_SUCCESS) { |
|
GC_err_printf2("mach_msg failed with %d %s\n", |
|
(int)r,mach_error_string(r)); |
|
ABORT("mach_msg failed"); |
|
} |
|
|
|
switch(id) { |
|
#if defined(THREADS) |
|
case ID_STOP: |
|
if(GC_mprotect_state != GC_MP_NORMAL) |
|
ABORT("Called mprotect_stop when state wasn't normal"); |
|
GC_mprotect_state = GC_MP_DISCARDING; |
|
break; |
|
case ID_RESUME: |
|
if(GC_mprotect_state != GC_MP_STOPPED) |
|
ABORT("Called mprotect_resume when state wasn't stopped"); |
|
GC_mprotect_state = GC_MP_NORMAL; |
|
GC_mprotect_thread_reply(); |
|
break; |
|
#endif /* THREADS */ |
|
default: |
|
/* Handle the message (calls catch_exception_raise) */ |
|
if(!exc_server(&msg.head,&reply.head)) |
|
ABORT("exc_server failed"); |
|
/* Send the reply */ |
|
r = mach_msg( |
|
&reply.head, |
|
MACH_SEND_MSG, |
|
reply.head.msgh_size, |
|
0, |
|
MACH_PORT_NULL, |
|
MACH_MSG_TIMEOUT_NONE, |
|
MACH_PORT_NULL); |
|
if(r != MACH_MSG_SUCCESS) { |
|
/* This will fail if the thread dies, but the thread shouldn't |
|
die... */ |
|
#ifdef BROKEN_EXCEPTION_HANDLING |
|
GC_err_printf2( |
|
"mach_msg failed with %d %s while sending exc reply\n", |
|
(int)r,mach_error_string(r)); |
|
#else |
|
ABORT("mach_msg failed while sending exception reply"); |
|
#endif |
|
} |
|
} /* switch */ |
|
} /* for(;;) */ |
|
/* NOT REACHED */ |
|
return NULL; |
|
} |
|
|
|
/* All this SIGBUS code shouldn't be necessary. All protection faults should |
|
be going throught the mach exception handler. However, it seems a SIGBUS is |
|
occasionally sent for some unknown reason. Even more odd, it seems to be |
|
meaningless and safe to ignore. */ |
|
#ifdef BROKEN_EXCEPTION_HANDLING |
|
|
|
typedef void (* SIG_PF)(); |
|
static SIG_PF GC_old_bus_handler; |
|
|
|
/* Updates to this aren't atomic, but the SIGBUSs seem pretty rare. |
|
Even if this doesn't get updated property, it isn't really a problem */ |
|
static int GC_sigbus_count; |
|
|
|
static void GC_darwin_sigbus(int num,siginfo_t *sip,void *context) { |
|
if(num != SIGBUS) ABORT("Got a non-sigbus signal in the sigbus handler"); |
|
|
|
/* Ugh... some seem safe to ignore, but too many in a row probably means |
|
trouble. GC_sigbus_count is reset for each mach exception that is |
|
handled */ |
|
if(GC_sigbus_count >= 8) { |
|
ABORT("Got more than 8 SIGBUSs in a row!"); |
|
} else { |
|
GC_sigbus_count++; |
|
GC_err_printf0("GC: WARNING: Ignoring SIGBUS.\n"); |
|
} |
|
} |
|
#endif /* BROKEN_EXCEPTION_HANDLING */ |
|
|
|
void GC_dirty_init() { |
|
kern_return_t r; |
|
mach_port_t me; |
|
pthread_t thread; |
|
pthread_attr_t attr; |
|
exception_mask_t mask; |
|
|
|
# ifdef PRINTSTATS |
|
GC_printf0("Inititalizing mach/darwin mprotect virtual dirty bit " |
|
"implementation\n"); |
|
# endif |
|
# ifdef BROKEN_EXCEPTION_HANDLING |
|
GC_err_printf0("GC: WARNING: Enabling workarounds for various darwin " |
|
"exception handling bugs.\n"); |
|
# endif |
|
GC_dirty_maintained = TRUE; |
|
if (GC_page_size % HBLKSIZE != 0) { |
|
GC_err_printf0("Page size not multiple of HBLKSIZE\n"); |
|
ABORT("Page size not multiple of HBLKSIZE"); |
|
} |
|
|
|
GC_task_self = me = mach_task_self(); |
|
|
|
r = mach_port_allocate(me,MACH_PORT_RIGHT_RECEIVE,&GC_ports.exception); |
|
if(r != KERN_SUCCESS) ABORT("mach_port_allocate failed (exception port)"); |
|
|
|
r = mach_port_insert_right(me,GC_ports.exception,GC_ports.exception, |
|
MACH_MSG_TYPE_MAKE_SEND); |
|
if(r != KERN_SUCCESS) |
|
ABORT("mach_port_insert_right failed (exception port)"); |
|
|
|
#if defined(THREADS) |
|
r = mach_port_allocate(me,MACH_PORT_RIGHT_RECEIVE,&GC_ports.reply); |
|
if(r != KERN_SUCCESS) ABORT("mach_port_allocate failed (reply port)"); |
|
#endif |
|
|
|
/* The exceptions we want to catch */ |
|
mask = EXC_MASK_BAD_ACCESS; |
|
|
|
r = task_get_exception_ports( |
|
me, |
|
mask, |
|
GC_old_exc_ports.masks, |
|
&GC_old_exc_ports.count, |
|
GC_old_exc_ports.ports, |
|
GC_old_exc_ports.behaviors, |
|
GC_old_exc_ports.flavors |
|
); |
|
if(r != KERN_SUCCESS) ABORT("task_get_exception_ports failed"); |
|
|
|
r = task_set_exception_ports( |
|
me, |
|
mask, |
|
GC_ports.exception, |
|
EXCEPTION_DEFAULT, |
|
MACHINE_THREAD_STATE |
|
); |
|
if(r != KERN_SUCCESS) ABORT("task_set_exception_ports failed"); |
|
|
|
if(pthread_attr_init(&attr) != 0) ABORT("pthread_attr_init failed"); |
|
if(pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED) != 0) |
|
ABORT("pthread_attr_setdetachedstate failed"); |
|
|
|
# undef pthread_create |
|
/* This will call the real pthread function, not our wrapper */ |
|
if(pthread_create(&thread,&attr,GC_mprotect_thread,NULL) != 0) |
|
ABORT("pthread_create failed"); |
|
pthread_attr_destroy(&attr); |
|
|
|
/* Setup the sigbus handler for ignoring the meaningless SIGBUSs */ |
|
#ifdef BROKEN_EXCEPTION_HANDLING |
|
{ |
|
struct sigaction sa, oldsa; |
|
sa.sa_handler = (SIG_PF)GC_darwin_sigbus; |
|
sigemptyset(&sa.sa_mask); |
|
sa.sa_flags = SA_RESTART|SA_SIGINFO; |
|
if(sigaction(SIGBUS,&sa,&oldsa) < 0) ABORT("sigaction"); |
|
GC_old_bus_handler = (SIG_PF)oldsa.sa_handler; |
|
if (GC_old_bus_handler != SIG_DFL) { |
|
# ifdef PRINTSTATS |
|
GC_err_printf0("Replaced other SIGBUS handler\n"); |
|
# endif |
|
} |
|
} |
|
#endif /* BROKEN_EXCEPTION_HANDLING */ |
|
} |
|
|
|
/* The source code for Apple's GDB was used as a reference for the exception |
|
forwarding code. This code is similar to be GDB code only because there is |
|
only one way to do it. */ |
|
static kern_return_t GC_forward_exception( |
|
mach_port_t thread, |
|
mach_port_t task, |
|
exception_type_t exception, |
|
exception_data_t data, |
|
mach_msg_type_number_t data_count |
|
) { |
|
int i; |
|
kern_return_t r; |
|
mach_port_t port; |
|
exception_behavior_t behavior; |
|
thread_state_flavor_t flavor; |
|
|
|
thread_state_data_t thread_state; |
|
mach_msg_type_number_t thread_state_count = THREAD_STATE_MAX; |
|
|
|
for(i=0;i<GC_old_exc_ports.count;i++) |
|
if(GC_old_exc_ports.masks[i] & (1 << exception)) |
|
break; |
|
if(i==GC_old_exc_ports.count) ABORT("No handler for exception!"); |
|
|
|
port = GC_old_exc_ports.ports[i]; |
|
behavior = GC_old_exc_ports.behaviors[i]; |
|
flavor = GC_old_exc_ports.flavors[i]; |
|
|
|
if(behavior != EXCEPTION_DEFAULT) { |
|
r = thread_get_state(thread,flavor,thread_state,&thread_state_count); |
|
if(r != KERN_SUCCESS) |
|
ABORT("thread_get_state failed in forward_exception"); |
|
} |
|
|
|
switch(behavior) { |
|
case EXCEPTION_DEFAULT: |
|
r = exception_raise(port,thread,task,exception,data,data_count); |
|
break; |
|
case EXCEPTION_STATE: |
|
r = exception_raise_state(port,thread,task,exception,data, |
|
data_count,&flavor,thread_state,thread_state_count, |
|
thread_state,&thread_state_count); |
|
break; |
|
case EXCEPTION_STATE_IDENTITY: |
|
r = exception_raise_state_identity(port,thread,task,exception,data, |
|
data_count,&flavor,thread_state,thread_state_count, |
|
thread_state,&thread_state_count); |
|
break; |
|
default: |
|
r = KERN_FAILURE; /* make gcc happy */ |
|
ABORT("forward_exception: unknown behavior"); |
|
break; |
|
} |
|
|
|
if(behavior != EXCEPTION_DEFAULT) { |
|
r = thread_set_state(thread,flavor,thread_state,thread_state_count); |
|
if(r != KERN_SUCCESS) |
|
ABORT("thread_set_state failed in forward_exception"); |
|
} |
|
|
|
return r; |
|
} |
|
|
|
#define FWD() GC_forward_exception(thread,task,exception,code,code_count) |
|
|
|
/* This violates the namespace rules but there isn't anything that can be done |
|
about it. The exception handling stuff is hard coded to call this */ |
|
kern_return_t |
|
catch_exception_raise( |
|
mach_port_t exception_port,mach_port_t thread,mach_port_t task, |
|
exception_type_t exception,exception_data_t code, |
|
mach_msg_type_number_t code_count |
|
) { |
|
kern_return_t r; |
|
char *addr; |
|
struct hblk *h; |
|
int i; |
|
#ifdef POWERPC |
|
thread_state_flavor_t flavor = PPC_EXCEPTION_STATE; |
|
mach_msg_type_number_t exc_state_count = PPC_EXCEPTION_STATE_COUNT; |
|
ppc_exception_state_t exc_state; |
|
#else |
|
# error FIXME for non-ppc darwin |
|
#endif |
|
|
|
|
|
if(exception != EXC_BAD_ACCESS || code[0] != KERN_PROTECTION_FAILURE) { |
|
#ifdef DEBUG_EXCEPTION_HANDLING |
|
/* We aren't interested, pass it on to the old handler */ |
|
GC_printf3("Exception: 0x%x Code: 0x%x 0x%x in catch....\n", |
|
exception, |
|
code_count > 0 ? code[0] : -1, |
|
code_count > 1 ? code[1] : -1); |
|
#endif |
|
return FWD(); |
|
} |
|
|
|
r = thread_get_state(thread,flavor, |
|
(natural_t*)&exc_state,&exc_state_count); |
|
if(r != KERN_SUCCESS) { |
|
/* The thread is supposed to be suspended while the exception handler |
|
is called. This shouldn't fail. */ |
|
#ifdef BROKEN_EXCEPTION_HANDLING |
|
GC_err_printf0("thread_get_state failed in " |
|
"catch_exception_raise\n"); |
|
return KERN_SUCCESS; |
|
#else |
|
ABORT("thread_get_state failed in catch_exception_raise"); |
|
#endif |
|
} |
|
|
|
/* This is the address that caused the fault */ |
|
addr = (char*) exc_state.dar; |
|
|
|
if((HDR(addr)) == 0) { |
|
/* Ugh... just like the SIGBUS problem above, it seems we get a bogus |
|
KERN_PROTECTION_FAILURE every once and a while. We wait till we get |
|
a bunch in a row before doing anything about it. If a "real" fault |
|
ever occurres it'll just keep faulting over and over and we'll hit |
|
the limit pretty quickly. */ |
|
#ifdef BROKEN_EXCEPTION_HANDLING |
|
static char *last_fault; |
|
static int last_fault_count; |
|
|
|
if(addr != last_fault) { |
|
last_fault = addr; |
|
last_fault_count = 0; |
|
} |
|
if(++last_fault_count < 32) { |
|
if(last_fault_count == 1) |
|
GC_err_printf1( |
|
"GC: WARNING: Ignoring KERN_PROTECTION_FAILURE at %p\n", |
|
addr); |
|
return KERN_SUCCESS; |
|
} |
|
|
|
GC_err_printf1("Unexpected KERN_PROTECTION_FAILURE at %p\n",addr); |
|
/* Can't pass it along to the signal handler because that is |
|
ignoring SIGBUS signals. We also shouldn't call ABORT here as |
|
signals don't always work too well from the exception handler. */ |
|
GC_err_printf0("Aborting\n"); |
|
exit(EXIT_FAILURE); |
|
#else /* BROKEN_EXCEPTION_HANDLING */ |
|
/* Pass it along to the next exception handler |
|
(which should call SIGBUS/SIGSEGV) */ |
|
return FWD(); |
|
#endif /* !BROKEN_EXCEPTION_HANDLING */ |
|
} |
|
|
|
#ifdef BROKEN_EXCEPTION_HANDLING |
|
/* Reset the number of consecutive SIGBUSs */ |
|
GC_sigbus_count = 0; |
|
#endif |
|
|
|
if(GC_mprotect_state == GC_MP_NORMAL) { /* common case */ |
|
h = (struct hblk*)((word)addr & ~(GC_page_size-1)); |
|
UNPROTECT(h, GC_page_size); |
|
for (i = 0; i < divHBLKSZ(GC_page_size); i++) { |
|
register int index = PHT_HASH(h+i); |
|
async_set_pht_entry_from_index(GC_dirty_pages, index); |
|
} |
|
} else if(GC_mprotect_state == GC_MP_DISCARDING) { |
|
/* Lie to the thread for now. No sense UNPROTECT()ing the memory |
|
when we're just going to PROTECT() it again later. The thread |
|
will just fault again once it resumes */ |
|
} else { |
|
/* Shouldn't happen, i don't think */ |
|
GC_printf0("KERN_PROTECTION_FAILURE while world is stopped\n"); |
|
return FWD(); |
|
} |
|
return KERN_SUCCESS; |
|
} |
|
#undef FWD |
|
|
|
/* These should never be called, but just in case... */ |
|
kern_return_t catch_exception_raise_state(mach_port_name_t exception_port, |
|
int exception, exception_data_t code, mach_msg_type_number_t codeCnt, |
|
int flavor, thread_state_t old_state, int old_stateCnt, |
|
thread_state_t new_state, int new_stateCnt) |
|
{ |
|
ABORT("catch_exception_raise_state"); |
|
return(KERN_INVALID_ARGUMENT); |
|
} |
|
kern_return_t catch_exception_raise_state_identity( |
|
mach_port_name_t exception_port, mach_port_t thread, mach_port_t task, |
|
int exception, exception_data_t code, mach_msg_type_number_t codeCnt, |
|
int flavor, thread_state_t old_state, int old_stateCnt, |
|
thread_state_t new_state, int new_stateCnt) |
|
{ |
|
ABORT("catch_exception_raise_state_identity"); |
|
return(KERN_INVALID_ARGUMENT); |
|
} |
|
|
|
|
|
#endif /* DARWIN && MPROTECT_VDB */ |
|
|
# ifndef HAVE_INCREMENTAL_PROTECTION_NEEDS |
# ifndef HAVE_INCREMENTAL_PROTECTION_NEEDS |
int GC_incremental_protection_needs() |
int GC_incremental_protection_needs() |
{ |
{ |
Line 3151 GC_bool is_ptrfree; |
|
Line 3885 GC_bool is_ptrfree; |
|
/* callers. Ignore my frame and my callers frame. */ |
/* callers. Ignore my frame and my callers frame. */ |
|
|
#ifdef LINUX |
#ifdef LINUX |
# include <features.h> |
|
# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 1 || __GLIBC__ > 2 |
|
# define HAVE_BUILTIN_BACKTRACE |
|
# ifdef IA64 |
|
# define BUILTIN_BACKTRACE_BROKEN |
|
# endif |
|
# endif |
|
#endif |
|
|
|
#include <execinfo.h> |
|
#ifdef LINUX |
|
# include <unistd.h> |
# include <unistd.h> |
#endif |
#endif |
|
|
Line 3170 GC_bool is_ptrfree; |
|
Line 3893 GC_bool is_ptrfree; |
|
#ifdef SAVE_CALL_CHAIN |
#ifdef SAVE_CALL_CHAIN |
|
|
#if NARGS == 0 && NFRAMES % 2 == 0 /* No padding */ \ |
#if NARGS == 0 && NFRAMES % 2 == 0 /* No padding */ \ |
&& defined(HAVE_BUILTIN_BACKTRACE) |
&& defined(GC_HAVE_BUILTIN_BACKTRACE) |
|
|
|
#include <execinfo.h> |
|
|
void GC_save_callers (info) |
void GC_save_callers (info) |
struct callinfo info[NFRAMES]; |
struct callinfo info[NFRAMES]; |
{ |
{ |
Line 3214 struct callinfo info[NFRAMES]; |
|
Line 3939 struct callinfo info[NFRAMES]; |
|
asm("movl %%ebp,%0" : "=r"(frame)); |
asm("movl %%ebp,%0" : "=r"(frame)); |
fp = frame; |
fp = frame; |
# else |
# else |
word GC_save_regs_in_stack(); |
|
|
|
frame = (struct frame *) GC_save_regs_in_stack (); |
frame = (struct frame *) GC_save_regs_in_stack (); |
fp = (struct frame *)((long) frame -> FR_SAVFP + BIAS); |
fp = (struct frame *)((long) frame -> FR_SAVFP + BIAS); |
#endif |
#endif |
Line 3247 struct callinfo info[NFRAMES]; |
|
Line 3970 struct callinfo info[NFRAMES]; |
|
{ |
{ |
register int i; |
register int i; |
static int reentry_count = 0; |
static int reentry_count = 0; |
|
GC_bool stop = FALSE; |
|
|
LOCK(); |
LOCK(); |
++reentry_count; |
++reentry_count; |
Line 3257 struct callinfo info[NFRAMES]; |
|
Line 3981 struct callinfo info[NFRAMES]; |
|
# else |
# else |
GC_err_printf0("\tCall chain at allocation:\n"); |
GC_err_printf0("\tCall chain at allocation:\n"); |
# endif |
# endif |
for (i = 0; i < NFRAMES; i++) { |
for (i = 0; i < NFRAMES && !stop ; i++) { |
if (info[i].ci_pc == 0) break; |
if (info[i].ci_pc == 0) break; |
# if NARGS > 0 |
# if NARGS > 0 |
{ |
{ |
Line 3282 struct callinfo info[NFRAMES]; |
|
Line 4006 struct callinfo info[NFRAMES]; |
|
# ifdef LINUX |
# ifdef LINUX |
FILE *pipe; |
FILE *pipe; |
# endif |
# endif |
# if defined(HAVE_BUILTIN_BACKTRACE) && \ |
# if defined(GC_HAVE_BUILTIN_BACKTRACE) |
!defined(BUILTIN_BACKTRACE_BROKEN) |
|
char **sym_name = |
char **sym_name = |
backtrace_symbols((void **)(&(info[i].ci_pc)), 1); |
backtrace_symbols((void **)(&(info[i].ci_pc)), 1); |
char *name = sym_name[0]; |
char *name = sym_name[0]; |
GC_bool found_it = (strchr(name, '(') != 0); |
|
# else |
# else |
char buf[40]; |
char buf[40]; |
char *name = buf; |
char *name = buf; |
GC_bool fount_it = FALSE: |
|
sprintf(buf, "##PC##= 0x%lx", info[i].ci_pc); |
sprintf(buf, "##PC##= 0x%lx", info[i].ci_pc); |
# endif |
# endif |
# ifdef LINUX |
# if defined(LINUX) && !defined(SMALL_CONFIG) |
if (!found_it) { |
/* Try for a line number. */ |
|
{ |
# define EXE_SZ 100 |
# define EXE_SZ 100 |
static char exe_name[EXE_SZ]; |
static char exe_name[EXE_SZ]; |
# define CMD_SZ 200 |
# define CMD_SZ 200 |
Line 3306 struct callinfo info[NFRAMES]; |
|
Line 4028 struct callinfo info[NFRAMES]; |
|
static GC_bool found_exe_name = FALSE; |
static GC_bool found_exe_name = FALSE; |
static GC_bool will_fail = FALSE; |
static GC_bool will_fail = FALSE; |
int ret_code; |
int ret_code; |
/* Unfortunately, this is the common case for the */ |
|
/* main executable. */ |
|
/* Try to get it via a hairy and expensive scheme. */ |
/* Try to get it via a hairy and expensive scheme. */ |
/* First we get the name of the executable: */ |
/* First we get the name of the executable: */ |
if (will_fail) goto out; |
if (will_fail) goto out; |
Line 3324 struct callinfo info[NFRAMES]; |
|
Line 4044 struct callinfo info[NFRAMES]; |
|
/* Then we use popen to start addr2line -e <exe> <addr> */ |
/* Then we use popen to start addr2line -e <exe> <addr> */ |
/* There are faster ways to do this, but hopefully this */ |
/* There are faster ways to do this, but hopefully this */ |
/* isn't time critical. */ |
/* isn't time critical. */ |
sprintf(cmd_buf, "/usr/bin/addr2line -e %s 0x%lx", exe_name, |
sprintf(cmd_buf, "/usr/bin/addr2line -f -e %s 0x%lx", exe_name, |
(unsigned long)info[i].ci_pc); |
(unsigned long)info[i].ci_pc); |
pipe = popen(cmd_buf, "r"); |
pipe = popen(cmd_buf, "r"); |
if (pipe < 0 || fgets(result_buf, RESULT_SZ, pipe) == 0) { |
if (pipe == NULL |
|
|| (result_len = fread(result_buf, 1, RESULT_SZ - 1, pipe)) |
|
== 0) { |
|
if (pipe != NULL) pclose(pipe); |
will_fail = TRUE; |
will_fail = TRUE; |
goto out; |
goto out; |
} |
} |
result_len = strlen(result_buf); |
|
if (result_buf[result_len - 1] == '\n') --result_len; |
if (result_buf[result_len - 1] == '\n') --result_len; |
|
result_buf[result_len] = 0; |
if (result_buf[0] == '?' |
if (result_buf[0] == '?' |
|| result_buf[result_len-2] == ':' |
|| result_buf[result_len-2] == ':' |
&& result_buf[result_len-1] == '0') |
&& result_buf[result_len-1] == '0') { |
|
pclose(pipe); |
goto out; |
goto out; |
|
} |
|
/* Get rid of embedded newline, if any. Test for "main" */ |
|
{ |
|
char * nl = strchr(result_buf, '\n'); |
|
if (nl != NULL && nl < result_buf + result_len) { |
|
*nl = ':'; |
|
} |
|
if (strncmp(result_buf, "main", nl - result_buf) == 0) { |
|
stop = TRUE; |
|
} |
|
} |
if (result_len < RESULT_SZ - 25) { |
if (result_len < RESULT_SZ - 25) { |
/* Add in hex address */ |
/* Add in hex address */ |
sprintf(result_buf + result_len, " [0x%lx]", |
sprintf(result_buf + result_len, " [0x%lx]", |
Line 3344 struct callinfo info[NFRAMES]; |
|
Line 4079 struct callinfo info[NFRAMES]; |
|
} |
} |
name = result_buf; |
name = result_buf; |
pclose(pipe); |
pclose(pipe); |
out: |
out:; |
} |
} |
# endif /* LINUX */ |
# endif /* LINUX */ |
GC_err_printf1("\t\t%s\n", name); |
GC_err_printf1("\t\t%s\n", name); |
free(sym_name); /* May call GC_free; that's OK */ |
# if defined(GC_HAVE_BUILTIN_BACKTRACE) |
|
free(sym_name); /* May call GC_free; that's OK */ |
|
# endif |
} |
} |
} |
} |
LOCK(); |
LOCK(); |
Line 3358 struct callinfo info[NFRAMES]; |
|
Line 4095 struct callinfo info[NFRAMES]; |
|
|
|
#endif /* NEED_CALLINFO */ |
#endif /* NEED_CALLINFO */ |
|
|
#if defined(LINUX) && defined(__ELF__) && \ |
|
(!defined(SMALL_CONFIG) || defined(USE_PROC_FOR_LIBRARIES)) |
|
#ifdef GC_USE_LD_WRAP |
|
# define READ __real_read |
|
#else |
|
# define READ read |
|
#endif |
|
|
|
|
|
/* Repeatedly perform a read call until the buffer is filled or */ |
|
/* we encounter EOF. */ |
|
ssize_t GC_repeat_read(int fd, char *buf, size_t count) |
|
{ |
|
ssize_t num_read = 0; |
|
ssize_t result; |
|
|
|
while (num_read < count) { |
|
result = READ(fd, buf + num_read, count - num_read); |
|
if (result < 0) return result; |
|
if (result == 0) break; |
|
num_read += result; |
|
} |
|
return num_read; |
|
} |
|
#endif /* LINUX && ... */ |
|
|
|
|
|
#if defined(LINUX) && defined(__ELF__) && !defined(SMALL_CONFIG) |
#if defined(LINUX) && defined(__ELF__) && !defined(SMALL_CONFIG) |
|
|
/* Dump /proc/self/maps to GC_stderr, to enable looking up names for |
/* Dump /proc/self/maps to GC_stderr, to enable looking up names for |
addresses in FIND_LEAK output. */ |
addresses in FIND_LEAK output. */ |
|
|
|
static word dump_maps(char *maps) |
|
{ |
|
GC_err_write(maps, strlen(maps)); |
|
return 1; |
|
} |
|
|
void GC_print_address_map() |
void GC_print_address_map() |
{ |
{ |
int f; |
|
int result; |
|
char maps_temp[32768]; |
|
GC_err_printf0("---------- Begin address map ----------\n"); |
GC_err_printf0("---------- Begin address map ----------\n"); |
f = open("/proc/self/maps", O_RDONLY); |
GC_apply_to_maps(dump_maps); |
if (-1 == f) ABORT("Couldn't open /proc/self/maps"); |
|
do { |
|
result = GC_repeat_read(f, maps_temp, sizeof(maps_temp)); |
|
if (result <= 0) ABORT("Couldn't read /proc/self/maps"); |
|
GC_err_write(maps_temp, result); |
|
} while (result == sizeof(maps_temp)); |
|
|
|
GC_err_printf0("---------- End address map ----------\n"); |
GC_err_printf0("---------- End address map ----------\n"); |
} |
} |
|
|