diff options
Diffstat (limited to 'gc/dyn_load.c')
| -rw-r--r-- | gc/dyn_load.c | 111 |
1 files changed, 101 insertions, 10 deletions
diff --git a/gc/dyn_load.c b/gc/dyn_load.c index 5a86cf6..c970fa5 100644 --- a/gc/dyn_load.c +++ b/gc/dyn_load.c @@ -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 <sys/types.h> #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 */ @@ -53,6 +56,7 @@ !(defined(ALPHA) && defined(OSF1)) && \ !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \ !defined(RS6000) && !defined(SCO_ELF) && \ + !(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 @@ -124,7 +128,7 @@ 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 +175,7 @@ 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 */ @@ -243,6 +247,7 @@ void GC_register_dynamic_libraries() # endif /* SUNOS */ #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \ + (defined(FREEBSD) && defined(__ELF__)) || \ (defined(NETBSD) && defined(__ELF__)) || defined(HURD) @@ -417,13 +422,91 @@ static char *parse_map_entry(char *buf_ptr, word *start, word *end, 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. */ + +#include <stddef.h> +#include <elf.h> +#include <link.h> + +# 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 <sys/exec_elf.h> #else @@ -431,6 +514,8 @@ static char *parse_map_entry(char *buf_ptr, word *start, word *end, #endif #include <link.h> +# endif + /* Newer versions of Linux/Alpha and Linux/x86 define this macro. We * define it for those older versions that don't. */ # ifndef ElfW @@ -472,9 +557,15 @@ 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) { @@ -649,7 +740,7 @@ 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) { @@ -864,7 +955,7 @@ 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; |