=================================================================== RCS file: /home/cvs/OpenXM_contrib2/asir2000/gc/dyn_load.c,v retrieving revision 1.5 retrieving revision 1.6 diff -u -p -r1.5 -r1.6 --- OpenXM_contrib2/asir2000/gc/dyn_load.c 2002/07/24 07:46:16 1.5 +++ OpenXM_contrib2/asir2000/gc/dyn_load.c 2002/07/24 08:00:08 1.6 @@ -26,15 +26,18 @@ * None of this is safe with dlclose and incremental collection. * But then not much of anything is safe in the presence of dlclose. */ +#if defined(__linux__) && !defined(_GNU_SOURCE) + /* Can't test LINUX, since this must be define before other includes */ +# define _GNU_SOURCE +#endif #if !defined(MACOS) && !defined(_WIN32_WCE) # include #endif #include "private/gc_priv.h" -/* BTL: avoid circular redefinition of dlopen if SOLARIS_THREADS defined */ -# if (defined(LINUX_THREADS) || defined(SOLARIS_THREADS) \ - || defined(HPUX_THREADS) || defined(IRIX_THREADS)) && defined(dlopen) \ - && !defined(GC_USE_LD_WRAP) +/* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */ +# if (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)) \ + && defined(dlopen) && !defined(GC_USE_LD_WRAP) /* To support threads in Solaris, gc.h interposes on dlopen by */ /* defining "dlopen" to be "GC_dlopen", which is implemented below. */ /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */ @@ -52,8 +55,9 @@ !defined(MSWIN32) && !defined(MSWINCE) && \ !(defined(ALPHA) && defined(OSF1)) && \ !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \ - !defined(RS6000) && !defined(SCO_ELF) && \ - !(defined(NETBSD) && defined(__ELF__)) + !defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \ + !(defined(FREEBSD) && defined(__ELF__)) && \ + !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) --> We only know how to find data segments of dynamic libraries for the --> above. Additional SVR4 variants might not be too --> hard to add. @@ -75,7 +79,24 @@ # define l_name lm_name #endif +#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \ + (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \ + (defined(NETBSD) && defined(__ELF__)) || defined(HURD) +# include +# include +# include +#endif +/* Newer versions of GNU/Linux define this macro. We + * define it similarly for any ELF systems that don't. */ +# ifndef ElfW +# if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32 +# define ElfW(type) Elf32_##type +# else +# define ElfW(type) Elf64_##type +# endif +# endif + #if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES) #ifdef LINT @@ -85,11 +106,11 @@ static struct link_map * GC_FirstDLOpenedLinkMap() { - extern Elf32_Dyn _DYNAMIC; - Elf32_Dyn *dp; + extern ElfW(Dyn) _DYNAMIC; + ElfW(Dyn) *dp; struct r_debug *r; static struct link_map * cachedResult = 0; - static Elf32_Dyn *dynStructureAddr = 0; + static ElfW(Dyn) *dynStructureAddr = 0; /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */ # ifdef SUNOS53_SHARED_LIB @@ -99,7 +120,7 @@ GC_FirstDLOpenedLinkMap() /* at program startup. */ if( dynStructureAddr == 0 ) { void* startupSyms = dlopen(0, RTLD_LAZY); - dynStructureAddr = (Elf32_Dyn*)dlsym(startupSyms, "_DYNAMIC"); + dynStructureAddr = (ElfW(Dyn)*)dlsym(startupSyms, "_DYNAMIC"); } # else dynStructureAddr = &_DYNAMIC; @@ -110,7 +131,7 @@ GC_FirstDLOpenedLinkMap() } if( cachedResult == 0 ) { int tag; - for( dp = ((Elf32_Dyn *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) { + for( dp = ((ElfW(Dyn) *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) { if( tag == DT_DEBUG ) { struct link_map *lm = ((struct r_debug *)(dp->d_un.d_ptr))->r_map; @@ -124,7 +145,7 @@ GC_FirstDLOpenedLinkMap() #endif /* SUNOS5DL ... */ -/* BTL: added to fix circular dlopen definition if SOLARIS_THREADS defined */ +/* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined */ # if defined(GC_must_restore_redefined_dlopen) # define dlopen GC_dlopen # endif @@ -171,7 +192,7 @@ static ptr_t GC_first_common() # if defined(SUNOS4) || defined(SUNOS5DL) /* Add dynamic library data sections to the root set. */ -# if !defined(PCR) && !defined(SOLARIS_THREADS) && defined(THREADS) +# if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS) # ifndef SRC_M3 --> fix mutual exclusion with dlopen # endif /* We assume M3 programs don't call dlopen for now */ @@ -196,14 +217,14 @@ void GC_register_dynamic_libraries() TRUE); # endif # ifdef SUNOS5DL - Elf32_Ehdr * e; - Elf32_Phdr * p; + ElfW(Ehdr) * e; + ElfW(Phdr) * p; unsigned long offset; char * start; register int i; - e = (Elf32_Ehdr *) lm->l_addr; - p = ((Elf32_Phdr *)(((char *)(e)) + e->e_phoff)); + e = (ElfW(Ehdr) *) lm->l_addr; + p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff)); offset = ((unsigned long)(lm->l_addr)); for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) { switch( p->p_type ) { @@ -243,7 +264,8 @@ void GC_register_dynamic_libraries() # endif /* SUNOS */ #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \ - (defined(NETBSD) && defined(__ELF__)) + (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \ + (defined(NETBSD) && defined(__ELF__)) || defined(HURD) #ifdef USE_PROC_FOR_LIBRARIES @@ -417,13 +439,87 @@ static char *parse_map_entry(char *buf_ptr, word *star return buf_ptr; } -#else /* !USE_PROC_FOR_LIBRARIES */ +#endif /* USE_PROC_FOR_LIBRARIES */ +#if !defined(USE_PROC_FOR_LIBRARIES) +/* The following is the preferred way to walk dynamic libraries */ +/* For glibc 2.2.4+. Unfortunately, it doesn't work for older */ +/* versions. Thanks to Jakub Jelinek for most of the code. */ + +# if defined(LINUX) /* Are others OK here, too? */ \ + && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ + || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) + +/* We have the header files for a glibc that includes dl_iterate_phdr. */ +/* It may still not be available in the library on the target system. */ +/* Thus we also treat it as a weak symbol. */ +#define HAVE_DL_ITERATE_PHDR + +static int GC_register_dynlib_callback(info, size, ptr) + struct dl_phdr_info * info; + size_t size; + void * ptr; +{ + const ElfW(Phdr) * p; + char * start; + register int i; + + /* Make sure struct dl_phdr_info is at least as big as we need. */ + if (size < offsetof (struct dl_phdr_info, dlpi_phnum) + + sizeof (info->dlpi_phnum)) + return -1; + + /* Skip the first object - it is the main program. */ + if (*(int *)ptr == 0) + { + *(int *)ptr = 1; + return 0; + } + + p = info->dlpi_phdr; + for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) { + switch( p->p_type ) { + case PT_LOAD: + { + if( !(p->p_flags & PF_W) ) break; + start = ((char *)(p->p_vaddr)) + info->dlpi_addr; + GC_add_roots_inner(start, start + p->p_memsz, TRUE); + } + break; + default: + break; + } + } + + return 0; +} + +/* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */ + +#pragma weak dl_iterate_phdr + +GC_bool GC_register_dynamic_libraries_dl_iterate_phdr() +{ + int tmp = 0; + + if (dl_iterate_phdr) { + dl_iterate_phdr(GC_register_dynlib_callback, &tmp); + return TRUE; + } else { + return FALSE; + } +} + +# else /* !LINUX || version(glibc) < 2.2.4 */ + /* Dynamic loading code for Linux running ELF. Somewhat tested on * Linux/x86, untested but hopefully should work on Linux/Alpha. * This code was derived from the Solaris/ELF support. Thanks to * whatever kind soul wrote that. - Patrick Bridges */ +/* This doesn't necessarily work in all cases, e.g. with preloaded + * dynamic libraries. */ + #if defined(NETBSD) # include #else @@ -431,23 +527,16 @@ static char *parse_map_entry(char *buf_ptr, word *star #endif #include -/* Newer versions of Linux/Alpha and Linux/x86 define this macro. We - * define it for those older versions that don't. */ -# ifndef ElfW -# if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32 -# define ElfW(type) Elf32_##type -# else -# define ElfW(type) Elf64_##type -# endif -# endif +# endif +#ifdef __GNUC__ +# pragma weak _DYNAMIC +#endif +extern ElfW(Dyn) _DYNAMIC[]; + static struct link_map * GC_FirstDLOpenedLinkMap() { -# ifdef __GNUC__ -# pragma weak _DYNAMIC -# endif - extern ElfW(Dyn) _DYNAMIC[]; ElfW(Dyn) *dp; struct r_debug *r; static struct link_map *cachedResult = 0; @@ -472,9 +561,15 @@ GC_FirstDLOpenedLinkMap() void GC_register_dynamic_libraries() { - struct link_map *lm = GC_FirstDLOpenedLinkMap(); + struct link_map *lm; +# ifdef HAVE_DL_ITERATE_PHDR + if (GC_register_dynamic_libraries_dl_iterate_phdr()) { + return; + } +# endif + lm = GC_FirstDLOpenedLinkMap(); for (lm = GC_FirstDLOpenedLinkMap(); lm != (struct link_map *) 0; lm = lm->l_next) { @@ -514,6 +609,10 @@ void GC_register_dynamic_libraries() #include #include #include +#include /* Only for the following test. */ +#ifndef _sigargs +# define IRIX6 +#endif extern void * GC_roots_present(); /* The type is a lie, since the real type doesn't make sense here, */ @@ -575,7 +674,8 @@ void GC_register_dynamic_libraries() if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant; if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE)) goto irrelevant; - /* The latter test is empirically useless. Other than the */ + /* The latter test is empirically useless in very old Irix */ + /* versions. Other than the */ /* main data and stack segments, everything appears to be */ /* mapped readable, writable, executable, and shared(!!). */ /* This makes no sense to me. - HB */ @@ -588,7 +688,11 @@ void GC_register_dynamic_libraries() # endif /* MMAP_STACKS */ limit = start + addr_map[i].pr_size; - if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) { + /* The following seemed to be necessary for very old versions */ + /* of Irix, but it has been reported to discard relevant */ + /* segments under Irix 6.5. */ +# ifndef IRIX6 + if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) { /* Discard text segments, i.e. 0-offset mappings against */ /* executable files which appear to have ELF headers. */ caddr_t arg; @@ -615,7 +719,8 @@ void GC_register_dynamic_libraries() goto irrelevant; } } - } + } +# endif /* !IRIX6 */ GC_add_roots_inner(start, limit, TRUE); irrelevant: ; } @@ -639,7 +744,7 @@ void GC_register_dynamic_libraries() extern GC_bool GC_is_heap_base (ptr_t p); -# ifdef WIN32_THREADS +# ifdef GC_WIN32_THREADS extern void GC_get_next_stack(char *start, char **lo, char **hi); void GC_cond_add_roots(char *base, char * limit) { @@ -672,7 +777,7 @@ void GC_register_dynamic_libraries() # endif # ifndef MSWINCE - extern GC_bool GC_win32s; + extern GC_bool GC_no_win32_dlls; # endif void GC_register_dynamic_libraries() @@ -685,7 +790,7 @@ void GC_register_dynamic_libraries() char * limit, * new_limit; # ifdef MSWIN32 - if (GC_win32s) return; + if (GC_no_win32_dlls) return; # endif base = limit = p = GC_sysinfo.lpMinimumApplicationAddress; # if defined(MSWINCE) && !defined(_WIN32_WCE_EMULATION) @@ -854,7 +959,7 @@ void GC_register_dynamic_libraries() /* Check if this is the end of the list or if some error occured */ if (status != 0) { -# ifdef HPUX_THREADS +# ifdef GC_HPUX_THREADS /* I've seen errno values of 0. The man page is not clear */ /* as to whether errno should get set on a -1 return. */ break;