95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
/*
|
|
libco.armeabi (2013-04-05)
|
|
author: Themaister
|
|
license: public domain
|
|
*/
|
|
|
|
#define LIBCO_C
|
|
#include <libco.h>
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
|
|
#ifndef IOS
|
|
#include <malloc.h>
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
static thread_local uint32_t co_active_buffer[64];
|
|
static thread_local cothread_t co_active_handle;
|
|
|
|
asm (
|
|
".arm\n"
|
|
".align 4\n"
|
|
".globl co_switch_arm\n"
|
|
".globl _co_switch_arm\n"
|
|
"co_switch_arm:\n"
|
|
"_co_switch_arm:\n"
|
|
" stmia r1!, {r4, r5, r6, r7, r8, r9, r10, r11, sp, lr}\n"
|
|
" ldmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11, sp, pc}\n"
|
|
);
|
|
|
|
/* ASM */
|
|
void co_switch_arm(cothread_t handle, cothread_t current);
|
|
|
|
static void crash(void)
|
|
{
|
|
/* Called only if cothread_t entrypoint returns. */
|
|
assert(0);
|
|
}
|
|
|
|
cothread_t co_create(unsigned int size, void (*entrypoint)(void))
|
|
{
|
|
size = (size + 1023) & ~1023;
|
|
cothread_t handle = 0;
|
|
#if HAVE_POSIX_MEMALIGN >= 1
|
|
if (posix_memalign(&handle, 1024, size + 256) < 0)
|
|
return 0;
|
|
#else
|
|
handle = memalign(1024, size + 256);
|
|
#endif
|
|
|
|
if (!handle)
|
|
return handle;
|
|
|
|
uint32_t *ptr = (uint32_t*)handle;
|
|
/* Non-volatiles. */
|
|
ptr[0] = 0; /* r4 */
|
|
ptr[1] = 0; /* r5 */
|
|
ptr[2] = 0; /* r6 */
|
|
ptr[3] = 0; /* r7 */
|
|
ptr[4] = 0; /* r8 */
|
|
ptr[5] = 0; /* r9 */
|
|
ptr[6] = 0; /* r10 */
|
|
ptr[7] = 0; /* r11 */
|
|
ptr[8] = (uintptr_t)ptr + size + 256 - 4; /* r13, stack pointer */
|
|
ptr[9] = (uintptr_t)entrypoint; /* r15, PC (link register r14 gets saved here). */
|
|
return handle;
|
|
}
|
|
|
|
cothread_t co_active(void)
|
|
{
|
|
if (!co_active_handle)
|
|
co_active_handle = co_active_buffer;
|
|
return co_active_handle;
|
|
}
|
|
|
|
void co_delete(cothread_t handle)
|
|
{
|
|
free(handle);
|
|
}
|
|
|
|
void co_switch(cothread_t handle)
|
|
{
|
|
cothread_t co_previous_handle = co_active();
|
|
co_switch_arm(co_active_handle = handle, co_previous_handle);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|