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