mirror of https://github.com/bsnes-emu/bsnes.git
107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
#define LIBCO_C
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#include "libco.h"
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#include "settings.h"
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#include <stdint.h>
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#ifdef LIBCO_MPROTECT
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#include <unistd.h>
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#include <sys/mman.h>
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#endif
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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 uint32_t co_swap_function[1024] = {
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0x910003f0, /* mov x16,sp */
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0xa9007830, /* stp x16,x30,[x1] */
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0xa9407810, /* ldp x16,x30,[x0] */
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0x9100021f, /* mov sp,x16 */
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0xa9015033, /* stp x19,x20,[x1, 16] */
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0xa9415013, /* ldp x19,x20,[x0, 16] */
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0xa9025835, /* stp x21,x22,[x1, 32] */
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0xa9425815, /* ldp x21,x22,[x0, 32] */
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0xa9036037, /* stp x23,x24,[x1, 48] */
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0xa9436017, /* ldp x23,x24,[x0, 48] */
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0xa9046839, /* stp x25,x26,[x1, 64] */
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0xa9446819, /* ldp x25,x26,[x0, 64] */
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0xa905703b, /* stp x27,x28,[x1, 80] */
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0xa945701b, /* ldp x27,x28,[x0, 80] */
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0xf900303d, /* str x29, [x1, 96] */
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0xf940301d, /* ldr x29, [x0, 96] */
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0x6d072428, /* stp d8, d9, [x1,112] */
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0x6d472408, /* ldp d8, d9, [x0,112] */
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0x6d082c2a, /* stp d10,d11,[x1,128] */
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0x6d482c0a, /* ldp d10,d11,[x0,128] */
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0x6d09342c, /* stp d12,d13,[x1,144] */
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0x6d49340c, /* ldp d12,d13,[x0,144] */
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0x6d0a3c2e, /* stp d14,d15,[x1,160] */
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0x6d4a3c0e, /* ldp d14,d15,[x0,160] */
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0xd61f03c0, /* br x30 */
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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 int offset = (size & ~15);
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unsigned long* p = (unsigned long*)((unsigned char*)handle + offset);
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handle[0] = (unsigned long)p; /* x16 (stack pointer) */
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handle[1] = (unsigned long)entrypoint; /* x30 (link register) */
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handle[12] = (unsigned long)p; /* x29 (frame 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 = LIBCO_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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LIBCO_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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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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