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translate-all: use qemu_protect_rwx/none helpers

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The helpers require the address and size to be page-aligned, so
do that before calling them.

Backports commit f51f315a676ec913a55ac27be4ef857f9f7ddc5c from qemu
This commit is contained in:
Emilio G. Cota 2018-03-14 10:52:37 -04:00 committed by Lioncash
parent 3fe9866ffe
commit f41747c9ba
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 14 additions and 48 deletions
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62
qemu/accel/tcg/translate-all.c
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@ -581,64 +581,25 @@ void free_code_gen_buffer(struct uc_struct *uc)
// Do nothing, we use a static buffer.
}
# ifdef _WIN32
static inline void do_protect(struct uc_struct *uc, void *addr, long size, int prot)
{
DWORD old_protect;
VirtualProtect(addr, size, prot, &old_protect);
}
static inline void map_exec(struct uc_struct *uc, void *addr, long size)
{
do_protect(uc, addr, size, PAGE_EXECUTE_READWRITE);
}
static inline void map_none(struct uc_struct *uc, void *addr, long size)
{
do_protect(uc, addr, size, PAGE_NOACCESS);
}
# else
static inline void do_protect(struct uc_struct *uc, void *addr, long size, int prot)
{
uintptr_t start, end;
start = (uintptr_t)addr;
start &= uc->qemu_real_host_page_mask;
end = (uintptr_t)addr + size;
end = ROUND_UP(end, uc->qemu_real_host_page_size);
mprotect((void *)start, end - start, prot);
}
static inline void map_exec(struct uc_struct *uc, void *addr, long size)
{
do_protect(uc, addr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
}
static inline void map_none(struct uc_struct *uc, void *addr, long size)
{
do_protect(uc, addr, size, PROT_NONE);
}
# endif /* WIN32 */
static inline void *alloc_code_gen_buffer(struct uc_struct *uc)
{
TCGContext *tcg_ctx = uc->tcg_ctx;
void *buf = static_code_gen_buffer;
void *end = static_code_gen_buffer + sizeof(static_code_gen_buffer);
size_t full_size, size;
/* The size of the buffer, rounded down to end on a page boundary. */
full_size = (((uintptr_t)buf + sizeof(static_code_gen_buffer))
& uc->qemu_real_host_page_mask) - (uintptr_t)buf;
/* page-align the beginning and end of the buffer */
buf = QEMU_ALIGN_PTR_UP(buf, uc->qemu_real_host_page_size);
end = QEMU_ALIGN_PTR_DOWN(end, uc->qemu_real_host_page_size);
/* Reserve a guard page. */
full_size = end - buf;
size = full_size - uc->qemu_real_host_page_size;
/* Honor a command-line option limiting the size of the buffer. */
if (size > tcg_ctx->code_gen_buffer_size) {
size = (((uintptr_t)buf + tcg_ctx->code_gen_buffer_size)
& uc->qemu_real_host_page_mask) - (uintptr_t)buf;
size = QEMU_ALIGN_DOWN(tcg_ctx->code_gen_buffer_size,
uc->qemu_real_host_page_size);
}
tcg_ctx->code_gen_buffer_size = size;
@ -648,8 +609,13 @@ static inline void *alloc_code_gen_buffer(struct uc_struct *uc)
size = tcg_ctx->code_gen_buffer_size;
}
#endif
map_exec(uc, buf, size);
map_none(uc, buf + size, uc->qemu_real_host_page_size);
if (qemu_mprotect_rwx(uc, buf, size)) {
abort();
}
if (qemu_mprotect_none(uc, buf + size, uc->qemu_real_host_page_size)) {
abort();
}
// Unicorn: commented out
//qemu_madvise(buf, size, QEMU_MADV_HUGEPAGE);