164 lines
6 KiB
C
Executable file
164 lines
6 KiB
C
Executable file
#define LIBCO_C
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#include "libco.h"
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#include "settings.h"
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#include <assert.h>
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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static thread_local long long co_active_buffer[64];
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static thread_local cothread_t co_active_handle = 0;
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static void (*co_swap)(cothread_t, cothread_t) = 0;
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#ifdef LIBCO_MPROTECT
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alignas(4096)
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#else
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section(text)
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#endif
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#ifdef _WIN32
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/* ABI: Win64 */
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static const unsigned char co_swap_function[4096] = {
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0x48, 0x89, 0x22, /* mov [rdx],rsp */
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0x48, 0x8b, 0x21, /* mov rsp,[rcx] */
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0x58, /* pop rax */
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0x48, 0x89, 0x6a, 0x08, /* mov [rdx+ 8],rbp */
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0x48, 0x89, 0x72, 0x10, /* mov [rdx+16],rsi */
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0x48, 0x89, 0x7a, 0x18, /* mov [rdx+24],rdi */
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0x48, 0x89, 0x5a, 0x20, /* mov [rdx+32],rbx */
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0x4c, 0x89, 0x62, 0x28, /* mov [rdx+40],r12 */
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0x4c, 0x89, 0x6a, 0x30, /* mov [rdx+48],r13 */
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0x4c, 0x89, 0x72, 0x38, /* mov [rdx+56],r14 */
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0x4c, 0x89, 0x7a, 0x40, /* mov [rdx+64],r15 */
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#if !defined(LIBCO_NO_SSE)
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0x0f, 0x29, 0x72, 0x50, /* movaps [rdx+ 80],xmm6 */
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0x0f, 0x29, 0x7a, 0x60, /* movaps [rdx+ 96],xmm7 */
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0x44, 0x0f, 0x29, 0x42, 0x70, /* movaps [rdx+112],xmm8 */
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0x48, 0x83, 0xc2, 0x70, /* add rdx,112 */
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0x44, 0x0f, 0x29, 0x4a, 0x10, /* movaps [rdx+ 16],xmm9 */
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0x44, 0x0f, 0x29, 0x52, 0x20, /* movaps [rdx+ 32],xmm10 */
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0x44, 0x0f, 0x29, 0x5a, 0x30, /* movaps [rdx+ 48],xmm11 */
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0x44, 0x0f, 0x29, 0x62, 0x40, /* movaps [rdx+ 64],xmm12 */
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0x44, 0x0f, 0x29, 0x6a, 0x50, /* movaps [rdx+ 80],xmm13 */
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0x44, 0x0f, 0x29, 0x72, 0x60, /* movaps [rdx+ 96],xmm14 */
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0x44, 0x0f, 0x29, 0x7a, 0x70, /* movaps [rdx+112],xmm15 */
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#endif
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0x48, 0x8b, 0x69, 0x08, /* mov rbp,[rcx+ 8] */
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0x48, 0x8b, 0x71, 0x10, /* mov rsi,[rcx+16] */
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0x48, 0x8b, 0x79, 0x18, /* mov rdi,[rcx+24] */
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0x48, 0x8b, 0x59, 0x20, /* mov rbx,[rcx+32] */
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0x4c, 0x8b, 0x61, 0x28, /* mov r12,[rcx+40] */
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0x4c, 0x8b, 0x69, 0x30, /* mov r13,[rcx+48] */
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0x4c, 0x8b, 0x71, 0x38, /* mov r14,[rcx+56] */
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0x4c, 0x8b, 0x79, 0x40, /* mov r15,[rcx+64] */
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#if !defined(LIBCO_NO_SSE)
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0x0f, 0x28, 0x71, 0x50, /* movaps xmm6, [rcx+ 80] */
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0x0f, 0x28, 0x79, 0x60, /* movaps xmm7, [rcx+ 96] */
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0x44, 0x0f, 0x28, 0x41, 0x70, /* movaps xmm8, [rcx+112] */
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0x48, 0x83, 0xc1, 0x70, /* add rcx,112 */
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0x44, 0x0f, 0x28, 0x49, 0x10, /* movaps xmm9, [rcx+ 16] */
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0x44, 0x0f, 0x28, 0x51, 0x20, /* movaps xmm10,[rcx+ 32] */
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0x44, 0x0f, 0x28, 0x59, 0x30, /* movaps xmm11,[rcx+ 48] */
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0x44, 0x0f, 0x28, 0x61, 0x40, /* movaps xmm12,[rcx+ 64] */
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0x44, 0x0f, 0x28, 0x69, 0x50, /* movaps xmm13,[rcx+ 80] */
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0x44, 0x0f, 0x28, 0x71, 0x60, /* movaps xmm14,[rcx+ 96] */
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0x44, 0x0f, 0x28, 0x79, 0x70, /* movaps xmm15,[rcx+112] */
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#endif
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0xff, 0xe0, /* jmp rax */
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};
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#include <windows.h>
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static void co_init() {
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#ifdef LIBCO_MPROTECT
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DWORD old_privileges;
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VirtualProtect((void*)co_swap_function, sizeof co_swap_function, PAGE_EXECUTE_READ, &old_privileges);
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#endif
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}
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#else
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/* ABI: SystemV */
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static const unsigned char co_swap_function[4096] = {
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0x48, 0x89, 0x26, /* mov [rsi],rsp */
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0x48, 0x8b, 0x27, /* mov rsp,[rdi] */
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0x58, /* pop rax */
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0x48, 0x89, 0x6e, 0x08, /* mov [rsi+ 8],rbp */
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0x48, 0x89, 0x5e, 0x10, /* mov [rsi+16],rbx */
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0x4c, 0x89, 0x66, 0x18, /* mov [rsi+24],r12 */
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0x4c, 0x89, 0x6e, 0x20, /* mov [rsi+32],r13 */
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0x4c, 0x89, 0x76, 0x28, /* mov [rsi+40],r14 */
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0x4c, 0x89, 0x7e, 0x30, /* mov [rsi+48],r15 */
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0x48, 0x8b, 0x6f, 0x08, /* mov rbp,[rdi+ 8] */
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0x48, 0x8b, 0x5f, 0x10, /* mov rbx,[rdi+16] */
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0x4c, 0x8b, 0x67, 0x18, /* mov r12,[rdi+24] */
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0x4c, 0x8b, 0x6f, 0x20, /* mov r13,[rdi+32] */
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0x4c, 0x8b, 0x77, 0x28, /* mov r14,[rdi+40] */
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0x4c, 0x8b, 0x7f, 0x30, /* mov r15,[rdi+48] */
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0xff, 0xe0, /* jmp rax */
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};
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#include <unistd.h>
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#include <sys/mman.h>
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static void co_init() {
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#ifdef LIBCO_MPROTECT
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unsigned long long addr = (unsigned long long)co_swap_function;
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unsigned long long base = addr - (addr % sysconf(_SC_PAGESIZE));
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unsigned long long size = (addr - base) + sizeof co_swap_function;
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mprotect((void*)base, size, PROT_READ | PROT_EXEC);
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#endif
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}
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#endif
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static void crash() {
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assert(0); /* called only if cothread_t entrypoint returns */
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}
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cothread_t co_active() {
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if(!co_active_handle) co_active_handle = &co_active_buffer;
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return co_active_handle;
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}
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cothread_t co_derive(void* memory, unsigned int size, void (*entrypoint)(void)) {
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cothread_t handle;
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if(!co_swap) {
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co_init();
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co_swap = (void (*)(cothread_t, cothread_t))co_swap_function;
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}
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if(!co_active_handle) co_active_handle = &co_active_buffer;
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if((handle = (cothread_t)memory)) {
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unsigned int offset = (size & ~15) - 32;
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long long *p = (long long*)((char*)handle + offset); /* seek to top of stack */
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*--p = (long long)crash; /* crash if entrypoint returns */
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*--p = (long long)entrypoint; /* start of function */
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*(long long*)handle = (long long)p; /* stack pointer */
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}
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return handle;
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}
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cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
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void* memory = malloc(size);
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if(!memory) return (cothread_t)0;
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return co_derive(memory, size, entrypoint);
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}
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void co_delete(cothread_t handle) {
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free(handle);
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}
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void co_switch(cothread_t handle) {
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register cothread_t co_previous_handle = co_active_handle;
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co_swap(co_active_handle = handle, co_previous_handle);
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}
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int co_serializable() {
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return 1;
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}
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#ifdef __cplusplus
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}
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#endif
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