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-rw-r--r--dyn_load.c152
1 files changed, 123 insertions, 29 deletions
diff --git a/dyn_load.c b/dyn_load.c
index 5a86cf6..13f6642 100644
--- a/dyn_load.c
+++ b/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 */
@@ -52,7 +55,8 @@
!defined(MSWIN32) && !defined(MSWINCE) && \
!(defined(ALPHA) && defined(OSF1)) && \
!defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
- !defined(RS6000) && !defined(SCO_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
@@ -75,6 +79,23 @@
# 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 <stddef.h>
+# include <elf.h>
+# include <link.h>
+#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)
@@ -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 ) {
@@ -243,6 +264,7 @@ void GC_register_dynamic_libraries()
# endif /* SUNOS */
#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
+ (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
(defined(NETBSD) && defined(__ELF__)) || defined(HURD)
@@ -417,13 +439,87 @@ 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. */
+
+# 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
@@ -431,15 +527,7 @@ static char *parse_map_entry(char *buf_ptr, word *start, word *end,
#endif
#include <link.h>
-/* 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
static struct link_map *
GC_FirstDLOpenedLinkMap()
@@ -472,9 +560,15 @@ 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 +743,7 @@ 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 +958,7 @@ 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;