mirror of https://github.com/bsnes-emu/bsnes.git
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
#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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#include <unistd.h>
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#include <sys/mman.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 unsigned 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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static const unsigned long co_swap_function[1024] = {
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0xe8a16ff0, /* stmia r1!, {r4-r11,sp,lr} */
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0xe8b0aff0, /* ldmia r0!, {r4-r11,sp,pc} */
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0xe12fff1e, /* bx lr */
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};
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static void co_init() {
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#ifdef LIBCO_MPROTECT
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unsigned long addr = (unsigned long)co_swap_function;
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unsigned long base = addr - (addr % sysconf(_SC_PAGESIZE));
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unsigned 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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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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unsigned long* 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 = (unsigned long*)memory) {
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unsigned long* p = (unsigned long*)((unsigned char*)handle + size);
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handle[8] = (unsigned long)p;
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handle[9] = (unsigned long)entrypoint;
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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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unsigned long* 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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size += 256;
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size &= ~15;
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if(handle = (unsigned long*)malloc(size)) {
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unsigned long* p = (unsigned long*)((unsigned char*)handle + size);
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handle[8] = (unsigned long)p;
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handle[9] = (unsigned long)entrypoint;
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}
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return handle;
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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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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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#ifdef __cplusplus
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}
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#endif
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