108 lines
3 KiB
C
108 lines
3 KiB
C
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#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 <stdint.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 uint32_t co_swap_function[1024] = {
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0xa9002428, /* stp x8,x9,[x1] */
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0xa9012c2a, /* stp x10,x11,[x1,#16] */
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0xa902342c, /* stp x12,x13,[x1,#32] */
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0xa9033c2e, /* stp x14,x15,[x1,#48] */
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0xf9002433, /* str x19,[x1,#72] */
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0xa9055434, /* stp x20,x21,[x1,#80] */
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0xa9065c36, /* stp x22,x23,[x1,#96] */
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0xa9076438, /* stp x24,x25,[x1,#112] */
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0xa9086c3a, /* stp x26,x27,[x1,#128] */
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0xa909743c, /* stp x28,x29,[x1,#144] */
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0x910003f0, /* mov x16,sp */
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0xa90a7830, /* stp x16,x30,[x1,#160] */
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0xa9402408, /* ldp x8,x9,[x0] */
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0xa9412c0a, /* ldp x10,x11,[x0,#16] */
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0xa942340c, /* ldp x12,x13,[x0,#32] */
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0xa9433c0e, /* ldp x14,x15,[x0,#48] */
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0xf9402413, /* ldr x19,[x0,#72] */
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0xa9455414, /* ldp x20,x21,[x0,#80] */
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0xa9465c16, /* ldp x22,x23,[x0,#96] */
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0xa9476418, /* ldp x24,x25,[x0,#112] */
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0xa9486c1a, /* ldp x26,x27,[x0,#128] */
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0xa949741c, /* ldp x28,x29,[x0,#144] */
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0xa94a4410, /* ldp x16,x17,[x0,#160] */
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0x9100021f, /* mov sp,x16 */
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0xd61f0220, /* br x17 */
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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[19] = (unsigned long)p; /* x29 (frame pointer) */
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handle[20] = (unsigned long)p; /* x30 (stack pointer) */
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handle[21] = (unsigned long)entrypoint; /* x31 (link register) */
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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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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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