diff options
| -rw-r--r-- | tcg/region.c | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/tcg/region.c b/tcg/region.c index 2b28ed3..a078899 100644 --- a/tcg/region.c +++ b/tcg/region.c @@ -33,8 +33,19 @@ #include "tcg/tcg.h" #include "exec/translation-block.h" #include "tcg-internal.h" +#include "host/cpuinfo.h" +/* + * Local source-level compatibility with Unix. + * Used by tcg_region_init below. + */ +#if defined(_WIN32) +#define PROT_READ 1 +#define PROT_WRITE 2 +#define PROT_EXEC 4 +#endif + struct tcg_region_tree { QemuMutex lock; QTree *tree; @@ -83,6 +94,18 @@ bool in_code_gen_buffer(const void *p) return (size_t)(p - region.start_aligned) <= region.total_size; } +#ifndef CONFIG_TCG_INTERPRETER +static int host_prot_read_exec(void) +{ +#if defined(CONFIG_LINUX) && defined(HOST_AARCH64) && defined(PROT_BTI) + if (cpuinfo & CPUINFO_BTI) { + return PROT_READ | PROT_EXEC | PROT_BTI; + } +#endif + return PROT_READ | PROT_EXEC; +} +#endif + #ifdef CONFIG_DEBUG_TCG const void *tcg_splitwx_to_rx(void *rw) { @@ -505,14 +528,6 @@ static int alloc_code_gen_buffer(size_t tb_size, int splitwx, Error **errp) return PROT_READ | PROT_WRITE; } #elif defined(_WIN32) -/* - * Local source-level compatibility with Unix. - * Used by tcg_region_init below. - */ -#define PROT_READ 1 -#define PROT_WRITE 2 -#define PROT_EXEC 4 - static int alloc_code_gen_buffer(size_t size, int splitwx, Error **errp) { void *buf; @@ -567,7 +582,7 @@ static int alloc_code_gen_buffer_splitwx_memfd(size_t size, Error **errp) goto fail; } - buf_rx = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_SHARED, fd, 0); + buf_rx = mmap(NULL, size, host_prot_read_exec(), MAP_SHARED, fd, 0); if (buf_rx == MAP_FAILED) { goto fail_rx; } @@ -642,7 +657,7 @@ static int alloc_code_gen_buffer_splitwx_vmremap(size_t size, Error **errp) return -1; } - if (mprotect((void *)buf_rx, size, PROT_READ | PROT_EXEC) != 0) { + if (mprotect((void *)buf_rx, size, host_prot_read_exec()) != 0) { error_setg_errno(errp, errno, "mprotect for jit splitwx"); munmap((void *)buf_rx, size); munmap((void *)buf_rw, size); @@ -805,7 +820,7 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus) need_prot = PROT_READ | PROT_WRITE; #ifndef CONFIG_TCG_INTERPRETER if (tcg_splitwx_diff == 0) { - need_prot |= PROT_EXEC; + need_prot |= host_prot_read_exec(); } #endif for (size_t i = 0, n = region.n; i < n; i++) { @@ -820,7 +835,11 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus) } else if (need_prot == (PROT_READ | PROT_WRITE)) { rc = qemu_mprotect_rw(start, end - start); } else { +#ifdef CONFIG_POSIX + rc = mprotect(start, end - start, need_prot); +#else g_assert_not_reached(); +#endif } if (rc) { error_setg_errno(&error_fatal, errno, |