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initial global prologue/epilogue implementation

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4407 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-10 10:55:51 +00:00
parent b03cce8e08
commit 7cb69cae20
2 changed files with 31 additions and 78 deletions
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44
exec.c
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@ -89,6 +89,7 @@ int nb_tbs;
/* any access to the tbs or the page table must use this lock */
spinlock_t tb_lock = SPIN_LOCK_UNLOCKED;
uint8_t code_gen_prologue[1024] __attribute__((aligned (32)));
uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE] __attribute__((aligned (32)));
uint8_t *code_gen_ptr;
@ -173,6 +174,31 @@ typedef struct subpage_t {
void *opaque[TARGET_PAGE_SIZE][2][4];
} subpage_t;
#ifdef _WIN32
static void map_exec(void *addr, long size)
{
DWORD old_protect;
VirtualProtect(addr, size,
PAGE_EXECUTE_READWRITE, &old_protect);
}
#else
static void map_exec(void *addr, long size)
{
unsigned long start, end;
start = (unsigned long)addr;
start &= ~(qemu_real_host_page_size - 1);
end = (unsigned long)addr + size;
end += qemu_real_host_page_size - 1;
end &= ~(qemu_real_host_page_size - 1);
mprotect((void *)start, end - start,
PROT_READ | PROT_WRITE | PROT_EXEC);
}
#endif
static void page_init(void)
{
/* NOTE: we can always suppose that qemu_host_page_size >=
@ -184,26 +210,12 @@ static void page_init(void)
GetSystemInfo(&system_info);
qemu_real_host_page_size = system_info.dwPageSize;
VirtualProtect(code_gen_buffer, sizeof(code_gen_buffer),
PAGE_EXECUTE_READWRITE, &old_protect);
}
#else
qemu_real_host_page_size = getpagesize();
{
unsigned long start, end;
start = (unsigned long)code_gen_buffer;
start &= ~(qemu_real_host_page_size - 1);
end = (unsigned long)code_gen_buffer + sizeof(code_gen_buffer);
end += qemu_real_host_page_size - 1;
end &= ~(qemu_real_host_page_size - 1);
mprotect((void *)start, end - start,
PROT_READ | PROT_WRITE | PROT_EXEC);
}
#endif
map_exec(code_gen_buffer, sizeof(code_gen_buffer));
map_exec(code_gen_prologue, sizeof(code_gen_prologue));
if (qemu_host_page_size == 0)
qemu_host_page_size = qemu_real_host_page_size;