mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-04-02 10:42:14 -04:00
94b2538af5
byuu says: Basically just a project rename, with s/bsnes/higan and the new icon from lowkee added in. It won't compile on Windows because I forgot to update the resource.rc file, and a path transform command isn't working on Windows. It was really just meant as a starting point, so that v091 WIPs can flow starting from .00 with the new name (it overshadows bsnes v091, so publicly speaking this "shouldn't exist" and will probably be deleted from Google Code when v092 is ready.)
93 lines
2.4 KiB
C
Executable file
93 lines
2.4 KiB
C
Executable file
/*
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libco.x86 (2009-10-12)
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author: byuu
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license: public domain
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*/
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#define LIBCO_C
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#include "libco.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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#if defined(_MSC_VER)
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#define fastcall __fastcall
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#elif defined(__GNUC__)
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#define fastcall __attribute__((fastcall))
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#else
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#error "libco: please define fastcall macro"
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#endif
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static thread_local long co_active_buffer[64];
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static thread_local cothread_t co_active_handle = 0;
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static void (fastcall *co_swap)(cothread_t, cothread_t) = 0;
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//ABI: fastcall
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static unsigned char co_swap_function[] = {
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0x89, 0x22, 0x8B, 0x21, 0x58, 0x89, 0x6A, 0x04, 0x89, 0x72, 0x08, 0x89, 0x7A, 0x0C, 0x89, 0x5A,
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0x10, 0x8B, 0x69, 0x04, 0x8B, 0x71, 0x08, 0x8B, 0x79, 0x0C, 0x8B, 0x59, 0x10, 0xFF, 0xE0,
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};
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#ifdef _WIN32
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#include <windows.h>
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void co_init() {
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DWORD old_privileges;
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VirtualProtect(co_swap_function, sizeof co_swap_function, PAGE_EXECUTE_READWRITE, &old_privileges);
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}
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#else
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#include <unistd.h>
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#include <sys/mman.h>
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void co_init() {
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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_WRITE | PROT_EXEC);
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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_create(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 (fastcall*)(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; /* allocate additional space for storage */
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size &= ~15; /* align stack to 16-byte boundary */
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if(handle = (cothread_t)malloc(size)) {
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long *p = (long*)((char*)handle + size); /* seek to top of stack */
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*--p = (long)crash; /* crash if entrypoint returns */
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*--p = (long)entrypoint; /* start of function */
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*(long*)handle = (long)p; /* stack pointer */
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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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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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#ifdef __cplusplus
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}
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#endif
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