diff options
| author | geoffk <geoffk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-09-28 07:03:59 +0000 |
|---|---|---|
| committer | geoffk <geoffk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-09-28 07:03:59 +0000 |
| commit | 6a53b02d23e554abfdbfbcaf2c0bd124e7ec47e9 (patch) | |
| tree | 6ac634501bdaf2ff88e85b2b5941422ceb3a20fb /gcc/config/darwin.h | |
| parent | 7e37d01e2e1f7f1546bffe6b4e0240831fcf6452 (diff) | |
| download | gcc-6a53b02d23e554abfdbfbcaf2c0bd124e7ec47e9.tar.gz | |
* config/darwin.h (ENABLE_EXECUTE_STACK): New, use getpagesize not
__sysctl.
* config/rs6000/darwin.h (ENABLE_EXECUTE_STACK): Remove.
* config/i386/darwin.h (ENABLE_EXECUTE_STACK): Remove.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@117274 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config/darwin.h')
| -rw-r--r-- | gcc/config/darwin.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h index 328754e8aee..6817dc83442 100644 --- a/gcc/config/darwin.h +++ b/gcc/config/darwin.h @@ -886,4 +886,42 @@ void add_framework_path (char *); #define TARGET_ASM_OUTPUT_ANCHOR NULL #endif +/* Attempt to turn on execute permission for the stack. This may be + used by INITIALIZE_TRAMPOLINE of the target needs it (that is, + if the target machine can change execute permissions on a page). + + There is no way to query the execute permission of the stack, so + we always issue the mprotect() call. + + Unfortunately it is not possible to make this namespace-clean. + + Also note that no errors should be emitted by this code; it is + considered dangerous for library calls to send messages to + stdout/stderr. */ + +#define ENABLE_EXECUTE_STACK \ +extern void __enable_execute_stack (void *); \ +void \ +__enable_execute_stack (void *addr) \ +{ \ + extern int mprotect (void *, size_t, int); \ + extern int getpagesize (void); \ + static int size; \ + static long mask; \ + \ + char *page, *end; \ + \ + if (size == 0) \ + { \ + size = getpagesize(); \ + mask = ~((long) size - 1); \ + } \ + \ + page = (char *) (((long) addr) & mask); \ + end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \ + \ + /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \ + (void) mprotect (page, end - page, 7); \ +} + #endif /* CONFIG_DARWIN_H */ |