From 56dc6ecb70e6fc76d32d6a7194acb273b76bfe0e Mon Sep 17 00:00:00 2001
From: David Guillen Fandos
Date: Mon, 8 Mar 2021 18:44:03 +0100
Subject: Remove libco

This removes libco and all the usages of it (+pthreads).
Rewired all dynarecs and interpreter to return after every frame so that
libretro can process events. This required to make dynarec re-entrant.

Dynarecs were updated to check for new frame on every update (IRQ, cycle
exhaustion, I/O write, etc). The performance impact of doing so should
be minimal (and definitely outweight the libco gains). While at it,
fixed small issues to get a bit more perf: arm dynarec was not idling
correctly, mips was using stack when not needed, etc.

Tested on PSP (mips), OGA (armv7), Linux (x86 and interpreter). Not
tested on Android though.
---
 libco/aarch64.c | 123 --------------------------------------------------------
 1 file changed, 123 deletions(-)
 delete mode 100644 libco/aarch64.c

(limited to 'libco/aarch64.c')

diff --git a/libco/aarch64.c b/libco/aarch64.c
deleted file mode 100644
index 2eb9ac6..0000000
--- a/libco/aarch64.c
+++ /dev/null
@@ -1,123 +0,0 @@
-/*
-  libco.aarch64 (2017-06-26)
-  author: webgeek1234
-  license: public domain
-*/
-
-#define LIBCO_C
-#include "libco.h"
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdint.h>
-
-#ifndef __APPLE__
-#include <malloc.h>
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-static thread_local uint64_t co_active_buffer[64];
-static thread_local cothread_t co_active_handle;
-
-asm (
-      ".globl co_switch_aarch64\n"
-      ".globl _co_switch_aarch64\n"
-      "co_switch_aarch64:\n"
-      "_co_switch_aarch64:\n"
-      "  stp x8,  x9,  [x1]\n"
-      "  stp x10, x11, [x1, #16]\n"
-      "  stp x12, x13, [x1, #32]\n"
-      "  stp x14, x15, [x1, #48]\n"
-      "  str x19, [x1, #72]\n"
-      "  stp x20, x21, [x1, #80]\n"
-      "  stp x22, x23, [x1, #96]\n"
-      "  stp x24, x25, [x1, #112]\n"
-      "  stp x26, x27, [x1, #128]\n"
-      "  stp x28, x29, [x1, #144]\n"
-      "  mov x16, sp\n"
-      "  stp x16, x30, [x1, #160]\n"
-
-      "  ldp x8,  x9,  [x0]\n"
-      "  ldp x10, x11, [x0, #16]\n"
-      "  ldp x12, x13, [x0, #32]\n"
-      "  ldp x14, x15, [x0, #48]\n"
-      "  ldr x19, [x0, #72]\n"
-      "  ldp x20, x21, [x0, #80]\n"
-      "  ldp x22, x23, [x0, #96]\n"
-      "  ldp x24, x25, [x0, #112]\n"
-      "  ldp x26, x27, [x0, #128]\n"
-      "  ldp x28, x29, [x0, #144]\n"
-      "  ldp x16, x17, [x0, #160]\n"
-      "  mov sp, x16\n"
-      "  br x17\n"
-    );
-
-/* ASM */
-void co_switch_aarch64(cothread_t handle, cothread_t current);
-
-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 + 512) < 0)
-      return 0;
-#else
-   handle = memalign(1024, size + 512);
-#endif
-
-   if (!handle)
-      return handle;
-
-   uint64_t *ptr = (uint64_t*)handle;
-   /* Non-volatiles.  */
-   ptr[0]  = 0; /* x8  */
-   ptr[1]  = 0; /* x9  */
-   ptr[2]  = 0; /* x10 */
-   ptr[3]  = 0; /* x11 */
-   ptr[4]  = 0; /* x12 */
-   ptr[5]  = 0; /* x13 */
-   ptr[6]  = 0; /* x14 */
-   ptr[7]  = 0; /* x15 */
-   ptr[8]  = 0; /* padding */
-   ptr[9]  = 0; /* x19 */
-   ptr[10] = 0; /* x20 */
-   ptr[11] = 0; /* x21 */
-   ptr[12] = 0; /* x22 */
-   ptr[13] = 0; /* x23 */
-   ptr[14] = 0; /* x24 */
-   ptr[15] = 0; /* x25 */
-   ptr[16] = 0; /* x26 */
-   ptr[17] = 0; /* x27 */
-   ptr[18] = 0; /* x28 */
-   ptr[20] = (uintptr_t)ptr + size + 512 - 16; /* x30, stack pointer */
-   ptr[19] = ptr[20]; /* x29, frame pointer */
-   ptr[21] = (uintptr_t)entrypoint; /* PC (link register x31 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_aarch64(co_active_handle = handle, co_previous_handle);
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-- 
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