start implementing the libretro interface. (not working yet)

1 files changed, 95 insertions, 0 deletions

diff --git a/libco/armeabi.c b/libco/armeabi.c
new file mode 100644
index 0000000..c9b68d0
--- /dev/null
+++ b/libco/armeabi.c
@@ -0,0 +1,95 @@
+/*
+  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
+