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fix Apple Silicon JIT compilation

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* configure.ac: check for pthread_jit_write_protect_np.

* libguile/jit.c: add support for Apple Silicon JIT compilation.

Fixes https://debbugs.gnu.org/cgi/bugreport.cgi?bug=44505
This commit is contained in:
Aleix Conchillo Flaqué 2022-11-17 17:36:15 -08:00 • committed by Daniel Llorens
parent b54263dc98
commit 3bdcc3668f
2 changed files with 27 additions and 1 deletions
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3
configure.ac
View file

@ -1187,6 +1187,9 @@ case "$with_threads" in
pthread_get_stackaddr_np pthread_attr_get_np pthread_sigmask \
pthread_cancel])
# Apple Silicon JIT code arena needs to be unprotected before writing.
AC_CHECK_FUNCS([pthread_jit_write_protect_np])
# On past versions of Solaris, believe 8 through 10 at least, you
# had to write "pthread_once_t foo = { PTHREAD_ONCE_INIT };".
# This is contrary to POSIX:

25
libguile/jit.c
View file

@ -47,6 +47,10 @@
#include <sys/mman.h>
#endif
#if defined __APPLE__ && HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
#include <libkern/OSCacheControl.h>
#endif
#include "jit.h"
@ -1349,9 +1353,13 @@ allocate_code_arena (size_t size, struct code_arena *prev)
ret->size = size;
ret->prev = prev;
#ifndef __MINGW32__
int flags = MAP_PRIVATE | MAP_ANONYMOUS;
#if defined __APPLE__ && HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
flags |= MAP_JIT;
#endif
ret->base = mmap (NULL, ret->size,
PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
flags, -1, 0);
if (ret->base == MAP_FAILED)
{
perror ("allocating JIT code buffer failed");
@ -1406,11 +1414,21 @@ emit_code (scm_jit_state *j, void (*emit) (scm_jit_state *))
uint8_t *ret = jit_address (j->jit);
#if defined __APPLE__ && HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
pthread_jit_write_protect_np(0);
#endif
emit (j);
size_t size;
if (!jit_has_overflow (j->jit) && jit_end (j->jit, &size))
{
#if defined __APPLE__ && HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
/* protect previous code arena. leave unprotected after emit()
since jit_end() also writes to code arena. */
pthread_jit_write_protect_np(1);
sys_icache_invalidate(arena->base, arena->size);
#endif
ASSERT (size <= (arena->size - arena->used));
DEBUG ("mcode: %p,+%zu\n", ret, size);
arena->used += size;
@ -1424,6 +1442,11 @@ emit_code (scm_jit_state *j, void (*emit) (scm_jit_state *))
}
else
{
#if defined __APPLE__ && HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
/* protect previous code arena */
pthread_jit_write_protect_np(1);
sys_icache_invalidate(arena->base, arena->size);
#endif
jit_reset (j->jit);
if (arena->used == 0)
{