--- /dev/null
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Mupen64plus - rjump.c *
+ * Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ *
+ * Copyright (C) 2007 Richard Goedeken (Richard42) *
+ * Copyright (C) 2002 Hacktarux *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 2 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, write to the *
+ * Free Software Foundation, Inc., *
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include <stdlib.h>
+
+#include "api/m64p_types.h"
+#include "api/callbacks.h"
+#include "r4300/recomp.h"
+#include "r4300/r4300.h"
+#include "r4300/macros.h"
+#include "r4300/ops.h"
+#include "r4300/recomph.h"
+
+// that's where the dynarec will restart when going back from a C function
+static unsigned long long *return_address;
+
+void dyna_jump(void)
+{
+ if (stop == 1)
+ {
+ dyna_stop();
+ return;
+ }
+
+ if (PC->reg_cache_infos.need_map)
+ *return_address = (unsigned long long) (PC->reg_cache_infos.jump_wrapper);
+ else
+ *return_address = (unsigned long long) (actual->code + PC->local_addr);
+}
+
+static long long save_rsp = 0;
+static long long save_rip = 0;
+
+void dyna_start(void *code)
+{
+ /* save the base and stack pointers */
+ /* make a call and a pop to retrieve the instruction pointer and save it too */
+ /* then call the code(), which should theoretically never return. */
+ /* When dyna_stop() sets the *return_address to the saved RIP, the emulator thread will come back here. */
+ /* It will jump to label 2, restore the base and stack pointers, and exit this function */
+ DebugMessage(M64MSG_INFO, "R4300: starting 64-bit dynamic recompiler at: %p", code);
+#if defined(__GNUC__) && defined(__x86_64__)
+ asm volatile
+ (" push %%rbx \n" /* we must push an even # of registers to keep stack 16-byte aligned */
+ " push %%r12 \n"
+ " push %%r13 \n"
+ " push %%r14 \n"
+ " push %%r15 \n"
+ " push %%rbp \n"
+ " mov %%rsp, %[save_rsp] \n"
+ " lea %[reg], %%r15 \n" /* store the base location of the r4300 registers in r15 for addressing */
+ " call 1f \n"
+ " jmp 2f \n"
+ "1: \n"
+ " pop %%rax \n"
+ " mov %%rax, %[save_rip] \n"
+
+ " sub $0x10, %%rsp \n"
+ " and $-16, %%rsp \n" /* ensure that stack is 16-byte aligned */
+ " mov %%rsp, %%rax \n"
+ " sub $8, %%rax \n"
+ " mov %%rax, %[return_address]\n"
+
+ " call *%%rbx \n"
+ "2: \n"
+ " mov %[save_rsp], %%rsp \n"
+ " pop %%rbp \n"
+ " pop %%r15 \n"
+ " pop %%r14 \n"
+ " pop %%r13 \n"
+ " pop %%r12 \n"
+ " pop %%rbx \n"
+ : [save_rsp]"=m"(save_rsp), [save_rip]"=m"(save_rip), [return_address]"=m"(return_address)
+ : "b" (code), [reg]"m"(*reg)
+ : "%rax", "memory"
+ );
+#endif
+
+ /* clear the registers so we don't return here a second time; that would be a bug */
+ save_rsp=0;
+ save_rip=0;
+}
+
+void dyna_stop(void)
+{
+ if (save_rip == 0)
+ DebugMessage(M64MSG_WARNING, "Instruction pointer is 0 at dyna_stop()");
+ else
+ {
+ *return_address = (unsigned long long) save_rip;
+ }
+}
+