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No longer need SPRR and probe it runtime

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lazymio
2024-12-07 23:33:34 +08:00
parent b7199261b5
commit 958ed09153
4 changed files with 74 additions and 24 deletions
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78
qemu/include/tcg/tcg-apple-jit.h
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@@ -25,18 +25,18 @@
#ifndef TCG_APPLE_JIT_H
#define TCG_APPLE_JIT_H
#if defined(__APPLE__) && defined(HAVE_PTHREAD_JIT_PROTECT) && defined(HAVE_SPRR) && (defined(__arm__) || defined(__aarch64__))
#include "assert.h"
#include "stdint.h"
#include "stdlib.h"
#include "stdbool.h"
/* write protect enable = write disable */
static inline void jit_write_protect(int enabled)
{
return pthread_jit_write_protect_np(enabled);
}
#if defined(__APPLE__) && defined(HAVE_SPRR) && (defined(__arm__) || defined(__aarch64__))
// Returns the S3_6_c15_c1_5 register's value
// Taken from
// https://stackoverflow.com/questions/70019553/lldb-how-to-read-the-permissions-of-a-memory-region-for-a-thread
// https://blog.svenpeter.dev/posts/m1_sprr_gxf/
// On Github Action (Virtualized environment), this shall always returns 0
static inline uint64_t read_sprr_perm(void)
{
uint64_t v;
@@ -50,7 +50,11 @@ __attribute__((unused)) static inline uint8_t thread_mask()
{
uint64_t v = read_sprr_perm();
return (v >> 20) & 3;
if (v == 0) {
return 0;
} else {
return (v >> 20) & 3;
}
}
__attribute__((unused)) static inline bool thread_writeable()
@@ -63,25 +67,69 @@ __attribute__((unused)) static inline bool thread_executable()
return thread_mask() == 1;
}
static inline void assert_executable(bool executable) {
uint64_t v = read_sprr_perm();
if (!v) {
assert(executable == thread_executable());
}
}
#else
// Returns the S3_6_c15_c1_5 register's value
// Taken from
// https://stackoverflow.com/questions/70019553/lldb-how-to-read-the-permissions-of-a-memory-region-for-a-thread
// https://blog.svenpeter.dev/posts/m1_sprr_gxf/
static inline uint64_t read_sprr_perm(void)
{
return 0;
}
__attribute__((unused)) static inline uint8_t thread_mask()
{
return 0;
}
__attribute__((unused)) static inline bool thread_writeable()
{
return false;
}
__attribute__((unused)) static inline bool thread_executable()
{
return false;
}
static inline void assert_executable(bool executable) {
}
#endif
#if defined(__APPLE__) && defined(HAVE_PTHREAD_JIT_PROTECT) && defined(HAVE_SPRR) && (defined(__arm__) || defined(__aarch64__))
/* write protect enable = write disable */
static inline void jit_write_protect(int enabled)
{
return pthread_jit_write_protect_np(enabled);
}
#define JIT_CALLBACK_GUARD(x) \
{ \
bool executable = uc->current_executable; \
assert (executable == thread_executable()); \
assert_executable(executable); \
x; \
if (executable != thread_executable()) { \
jit_write_protect(executable); \
} \
jit_write_protect(executable); \
} \
#define JIT_CALLBACK_GUARD_VAR(var, x) \
{ \
bool executable = uc->current_executable; \
assert (executable == thread_executable()); \
assert_executable(executable); \
var = x; \
if (executable != thread_executable()) { \
jit_write_protect(executable); \
} \
jit_write_protect(executable); \
} \