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authorRoland McGrath <roland@gnu.org>2003-07-29 08:57:15 +0000
committerRoland McGrath <roland@gnu.org>2003-07-29 08:57:15 +0000
commit172ce013bdd864ba22b6b22611ffd893f1f9f2a6 (patch)
tree8d147bf8e002c5dd3a2aa6a9c1a13a9b0a5bd460 /elf/dl-support.c
parent5181d776e8bb3c277ea291b3b43be0ce8a38c6c3 (diff)
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* elf/dl-support.c (_dl_hwcap): Add nocommon attribute.
Diffstat (limited to 'elf/dl-support.c')
-rw-r--r--elf/dl-support.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c
index 1616eec..6a02e4e 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -121,9 +121,19 @@ int _dl_debug_fd = STDERR_FILENO;
int _dl_correct_cache_id = _DL_CACHE_DEFAULT_ID;
-struct ElfW(Phdr) *_dl_phdr;
+ElfW(Phdr) *_dl_phdr;
size_t _dl_phnum;
-unsigned long int _dl_hwcap;
+unsigned long int _dl_hwcap __attribute__ ((nocommon));
+
+/* Prevailing state of the stack, PF_X indicating it's executable. */
+ElfW(Word) _dl_stack_flags = PF_R|PF_W|PF_X;
+
+/* If loading a shared object requires that we make the stack executable
+ when it was not, we do it by calling this function.
+ It returns an errno code or zero on success. */
+int (*_dl_make_stack_executable_hook) (void) internal_function
+ = _dl_make_stack_executable;
+
#ifdef NEED_DL_SYSINFO
/* Needed for improved syscall handling on at least x86/Linux. */
@@ -260,6 +270,15 @@ _dl_non_dynamic_init (void)
/* Now determine the length of the platform string. */
if (_dl_platform != NULL)
_dl_platformlen = strlen (_dl_platform);
+
+ /* Scan for a program header telling us the stack is nonexecutable. */
+ if (_dl_phdr != NULL)
+ for (uint_fast16_t i = 0; i < _dl_phnum; ++i)
+ if (_dl_phdr[i].p_type == PT_GNU_STACK)
+ {
+ _dl_stack_flags = _dl_phdr[i].p_flags;
+ break;
+ }
}