mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-04-08 06:50:27 +08:00
Code Issues Packages Projects Releases Wiki Activity

darwin.h (ENABLE_STACK_EXECUTE): Define.

Browse Source 
2006-02-28  Eric Christopher  <echristo@apple.com>

        * config/rs6000/darwin.h (ENABLE_STACK_EXECUTE): Define.
        Set up IN_LIBGCC definition of TARGET_64BIT.
        * config/i386/darwin.h (ENABLE_STACK_EXECUTE): Define.

From-SVN: r111584
This commit is contained in:
Eric Christopher 2006-03-01 00:02:14 +00:00 committed by Eric Christopher
parent b295c471c2
commit 31abac077d
3 changed files with 112 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2006-02-28 Eric Christopher <echristo@apple.com>
* config/rs6000/darwin.h (ENABLE_STACK_EXECUTE): Define.
Set up IN_LIBGCC definition of TARGET_64BIT.
* config/i386/darwin.h (ENABLE_STACK_EXECUTE): Define.
2006-02-28 Roger Sayle <roger@eyesopen.com>
PR middle-end/14752

47
gcc/config/i386/darwin.h
View File

@ -170,3 +170,50 @@ extern void darwin_x86_file_end (void);
: (n) == 4 ? 5 \
: (n) >= 11 && (n) <= 18 ? (n) + 1 \
: (n))
/* 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.
Note that we go out of our way to use namespace-non-invasive calls
here. Unfortunately, there is no libc-internal name for mprotect().
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 __sysctl (int *, unsigned int, void *, size_t *, \
void *, size_t); \
\
static int size; \
static long mask; \
\
char *page, *end; \
\
if (size == 0) \
{ \
int mib[2]; \
size_t len; \
\
mib[0] = 6; /* CTL_HW */ \
mib[1] = 7; /* HW_PAGESIZE */ \
len = sizeof (size); \
(void) __sysctl (mib, 2, &size, &len, NULL, 0); \
mask = ~((long) size - 1); \
} \
\
page = (char *) (((long) addr) & mask); \
end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
\
/* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \
(void) mprotect (page, end - page, 7); \
}

62
gcc/config/rs6000/darwin.h
View File

@ -27,6 +27,15 @@
#define DEFAULT_ABI ABI_DARWIN
#ifdef IN_LIBGCC2
#undef TARGET_64BIT
#ifdef __powerpc64__
#define TARGET_64BIT 1
#else
#define TARGET_64BIT 0
#endif
#endif
/* The object file format is Mach-O. */
#define TARGET_OBJECT_FORMAT OBJECT_MACHO
@ -338,11 +347,11 @@ do { \
#undef DEFAULT_SIGNED_CHAR
#define DEFAULT_SIGNED_CHAR (1)
/* Given an rtx X being reloaded into a reg required to be
in class CLASS, return the class of reg to actually use.
/* Given an rtx X being reloaded into a reg required to be
in class CLASS, return the class of reg to actually use.
In general this is just CLASS; but on some machines
in some cases it is preferable to use a more restrictive class.
On the RS/6000, we have to return NO_REGS when we want to reload a
floating-point CONST_DOUBLE to force it to be copied to memory.
@ -439,3 +448,50 @@ do { \
(TARGET_64BIT \
|| (darwin_macosx_version_min \
&& strverscmp (darwin_macosx_version_min, "10.3") >= 0))
/* 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.
Note that we go out of our way to use namespace-non-invasive calls
here. Unfortunately, there is no libc-internal name for mprotect().
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 __sysctl (int *, unsigned int, void *, size_t *, \
void *, size_t); \
\
static int size; \
static long mask; \
\
char *page, *end; \
\
if (size == 0) \
{ \
int mib[2]; \
size_t len; \
\
mib[0] = 6; /* CTL_HW */ \
mib[1] = 7; /* HW_PAGESIZE */ \
len = sizeof (size); \
(void) __sysctl (mib, 2, &size, &len, NULL, 0); \
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); \
}