diff options
Diffstat (limited to 'gcc/config/netbsd.h')
| -rw-r--r-- | gcc/config/netbsd.h | 86 |
1 files changed, 81 insertions, 5 deletions
diff --git a/gcc/config/netbsd.h b/gcc/config/netbsd.h index 38eb7491d84..f1f3589f48b 100644 --- a/gcc/config/netbsd.h +++ b/gcc/config/netbsd.h @@ -42,7 +42,7 @@ Boston, MA 02111-1307, USA. */ /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD source tree so it can be configured appropriately without using - the GNU configure/build mechanism. */ + the GNU configure/build mechanism. */ #ifdef NETBSD_NATIVE @@ -77,12 +77,39 @@ Boston, MA 02111-1307, USA. */ #endif /* NETBSD_NATIVE */ -/* Provide a LIB_SPEC appropriate for NetBSD. Just select the appropriate - libc, depending on whether we're doing profiling; if `-posix' is specified, - link against the appropriate libposix first. Don't include libc when - linking a shared library. */ +/* Provide a LIB_SPEC appropriate for NetBSD. Here we: + + 1. Select the appropriate set of libs, depending on whether we're + profiling. + + 2. Include the pthread library if -pthread is specified (only + if threads are enabled). + + 3. Include the posix library if -posix is specified. + + FIXME: Could eliminate the duplication here if we were allowed to + use string concatenation. */ #undef LIB_SPEC +#ifdef NETBSD_ENABLE_PTHREADS +#define LIB_SPEC \ + "%{pthread: \ + %{!p: \ + %{!pg:-lpthread}} \ + %{p:-lpthread_p} \ + %{pg:-lpthread_p}} \ + %{posix: \ + %{!p: \ + %{!pg:-lposix}} \ + %{p:-lposix_p} \ + %{pg:-lposix_p}} \ + %{!shared: \ + %{!symbolic: \ + %{!p: \ + %{!pg:-lc}} \ + %{p:-lc_p} \ + %{pg:-lc_p}}}" +#else #define LIB_SPEC \ "%{posix: \ %{!p: \ @@ -95,6 +122,7 @@ Boston, MA 02111-1307, USA. */ %{!pg:-lc}} \ %{p:-lc_p} \ %{pg:-lc_p}}}" +#endif /* Provide a LIBGCC_SPEC appropriate for NetBSD. We also want to exclude libgcc with -symbolic. */ @@ -152,3 +180,51 @@ 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); \ +} |