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netbsd.h (NETBSD_ENABLE_EXECUTE_STACK): Define __enable_execute_stack function.

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* config/netbsd.h (NETBSD_ENABLE_EXECUTE_STACK): Define
__enable_execute_stack function.
* config/alpha/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Define
as NETBSD_ENABLE_EXECUTE_STACK.
* config/i386/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/i386/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/i386/netbsd64.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/sparc/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/sparc/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Ditto.

From-SVN: r58292
This commit is contained in:
Jason Thorpe 2002-10-18 23:10:35 +00:00 committed by Jason Thorpe
parent 5791cc2970
commit 90e021a061
8 changed files with 79 additions and 0 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2002-10-18 Jason Thorpe <thorpej@wasabisystems.com>
* config/netbsd.h (NETBSD_ENABLE_EXECUTE_STACK): Define
__enable_execute_stack function.
* config/alpha/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Define
as NETBSD_ENABLE_EXECUTE_STACK.
* config/i386/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/i386/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/i386/netbsd64.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/sparc/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
* config/sparc/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Ditto.
2002-10-18 Jason Thorpe <thorpej@wasabisystems.com>
* config/i386/i386.c (x86_initialize_trampoline): Emit a call

5
gcc/config/alpha/netbsd.h
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@ -75,5 +75,10 @@ Boston, MA 02111-1307, USA. */
%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
/* Attempt to enable execute permissions on the stack. */
#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK
#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (NetBSD/alpha ELF)");

3
gcc/config/i386/netbsd-elf.h
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@ -121,4 +121,7 @@ Boston, MA 02111-1307, USA. */
we don't care about compatibility with older gcc versions. */
#define DEFAULT_PCC_STRUCT_RETURN 1
/* Attempt to enable execute permissions on the stack. */
#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK
#define TARGET_VERSION fprintf (stderr, " (NetBSD/i386 ELF)");

3
gcc/config/i386/netbsd.h
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@ -67,3 +67,6 @@
prefix is added. */
#undef GOT_SYMBOL_NAME
#define GOT_SYMBOL_NAME "GLOBAL_OFFSET_TABLE_"
/* Attempt to enable execute permissions on the stack. */
#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK

2
gcc/config/i386/netbsd64.h
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@ -69,5 +69,7 @@ Boston, MA 02111-1307, USA. */
fprintf (FILE, "\tcall __mcount\n"); \
}
/* Attempt to enable execute permissions on the stack. */
#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK
#define TARGET_VERSION fprintf (stderr, " (NetBSD/x86_64 ELF)");

48
gcc/config/netbsd.h
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@ -161,3 +161,51 @@ Boston, MA 02111-1307, USA. */
#undef WINT_TYPE
#define WINT_TYPE "int"
/* Attempt to turn on execute permission for the stack. This may be
used by TRANSFER_FROM_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 NETBSD_ENABLE_EXECUTE_STACK \
extern void __enable_execute_stack (void *); \
void \
__enable_execute_stack (addr) \
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); \
}

3
gcc/config/sparc/netbsd-elf.h
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@ -102,6 +102,9 @@ Boston, MA 02111-1307, USA. */
#undef STDC_0_IN_SYSTEM_HEADERS
/* Attempt to enable execute permissions on the stack. */
#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK
#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME);

3
gcc/config/sparc/netbsd.h
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@ -44,3 +44,6 @@
/* Until they use ELF or something that handles dwarf2 unwinds
and initialization stuff better. */
#define DWARF2_UNWIND_INFO 0
/* Attempt to enable execute permissions on the stack. */
#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK