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Use inline asm for x86 as well.

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This commit is contained in:
Themaister 2011-03-23 01:17:39 +01:00
parent dff06aa6a5
commit 035e578afb
1 changed files with 27 additions and 25 deletions
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52
libco/x86.c
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@ -23,33 +23,39 @@ extern "C" {
static thread_local long co_active_buffer[64];
static thread_local cothread_t co_active_handle = 0;
static void (fastcall *co_swap)(cothread_t, cothread_t) = 0;
//ABI: fastcall
static unsigned char co_swap_function[] = {
0x89, 0x22, 0x8B, 0x21, 0x58, 0x89, 0x6A, 0x04, 0x89, 0x72, 0x08, 0x89, 0x7A, 0x0C, 0x89, 0x5A,
0x10, 0x8B, 0x69, 0x04, 0x8B, 0x71, 0x08, 0x8B, 0x79, 0x0C, 0x8B, 0x59, 0x10, 0xFF, 0xE0,
};
// ASM co_swap
void fastcall co_swap(cothread_t new_thread, cothread_t old_thread);
#ifdef _WIN32
#include <windows.h>
void co_init() {
DWORD old_privileges;
VirtualProtect(co_swap_function, sizeof co_swap_function, PAGE_EXECUTE_READWRITE, &old_privileges);
}
#define ASM_CO_SWAP_DEF \
".globl @co_swap@8\n" \
"@co_swap@8:\n"
#else
#include <unistd.h>
#include <sys/mman.h>
void co_init() {
unsigned long addr = (unsigned long)co_swap_function;
unsigned long base = addr - (addr % sysconf(_SC_PAGESIZE));
unsigned long size = (addr - base) + sizeof co_swap_function;
mprotect((void*)base, size, PROT_READ | PROT_WRITE | PROT_EXEC);
}
#define ASM_CO_SWAP_DEF \
".globl co_swap\n" \
".type co_swap, @function\n" \
"co_swap:\n"
#endif
// ABI: fastcall
asm (
".text\n"
ASM_CO_SWAP_DEF
"movl %esp, (%edx)\n"
"movl (%ecx), %esp\n"
"popl %eax\n"
"movl %ebp, 0x4(%edx)\n"
"movl %esi, 0x8(%edx)\n"
"mov %edi, 0xc(%edx)\n"
"mov %ebx, 0x10(%edx)\n"
"mov 0x4(%ecx), %ebp\n"
"mov 0x8(%ecx), %esi\n"
"mov 0xc(%ecx), %edi\n"
"mov 0x10(%ecx), %ebx\n"
"jmp *%eax\n"
);
static void crash() {
assert(0); /* called only if cothread_t entrypoint returns */
}
@ -61,10 +67,6 @@ cothread_t co_active() {
cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
cothread_t handle;
if(!co_swap) {
co_init();
co_swap = (void (fastcall*)(cothread_t, cothread_t))co_swap_function;
}
if(!co_active_handle) co_active_handle = &co_active_buffer;
size += 256; /* allocate additional space for storage */
size &= ~15; /* align stack to 16-byte boundary */