First Commit

common/FastJmp.cpp

@@ -0,0 +1,92 @@
+// SPDX-FileCopyrightText: 2002-2025 PCSX2 Dev Team
+// SPDX-License-Identifier: GPL-3.0+
+
+#include "FastJmp.h"
+
+// Win32 uses Fastjmp.asm, because MSVC doesn't support inline asm.
+#if !defined(_WIN32) || defined(_M_ARM64)
+
+#if defined(__APPLE__)
+#define PREFIX "_"
+#else
+#define PREFIX ""
+#endif
+
+#if defined(_M_X86)
+
+asm(
+	"\t.global " PREFIX "fastjmp_set\n"
+	"\t.global " PREFIX "fastjmp_jmp\n"
+	"\t.text\n"
+	"\t" PREFIX "fastjmp_set:" R"(
+	movq 0(%rsp), %rax
+	movq %rsp, %rdx			# fixup stack pointer, so it doesn't include the call to fastjmp_set
+	addq $8, %rdx
+	movq %rax, 0(%rdi)	# actually rip
+	movq %rbx, 8(%rdi)
+	movq %rdx, 16(%rdi)	# actually rsp
+	movq %rbp, 24(%rdi)
+	movq %r12, 32(%rdi)
+	movq %r13, 40(%rdi)
+	movq %r14, 48(%rdi)
+	movq %r15, 56(%rdi)
+	xorl %eax, %eax
+	ret
+)"
+	"\t" PREFIX "fastjmp_jmp:" R"(
+	movl %esi, %eax
+	movq 0(%rdi), %rdx	# actually rip
+	movq 8(%rdi), %rbx
+	movq 16(%rdi), %rsp	# actually rsp
+	movq 24(%rdi), %rbp
+	movq 32(%rdi), %r12
+	movq 40(%rdi), %r13
+	movq 48(%rdi), %r14
+	movq 56(%rdi), %r15
+	jmp *%rdx
+)");
+
+#elif defined(_M_ARM64)
+
+asm(
+	"\t.global " PREFIX "fastjmp_set\n"
+	"\t.global " PREFIX "fastjmp_jmp\n"
+	"\t.text\n"
+	"\t.align 16\n"
+	"\t" PREFIX "fastjmp_set:" R"(
+	mov x16, sp
+	stp x16, x30, [x0]
+	stp x19, x20, [x0, #16]
+	stp x21, x22, [x0, #32]
+	stp x23, x24, [x0, #48]
+	stp x25, x26, [x0, #64]
+	stp x27, x28, [x0, #80]
+	str x29, [x0, #96]
+	stp d8, d9, [x0, #112]
+	stp d10, d11, [x0, #128]
+	stp d12, d13, [x0, #144]
+	stp d14, d15, [x0, #160]
+	mov w0, wzr
+	br x30
+)"
+".align 16\n"
+"\t" PREFIX "fastjmp_jmp:" R"(
+	ldp x16, x30, [x0]
+	mov sp, x16
+	ldp x19, x20, [x0, #16]
+	ldp x21, x22, [x0, #32]
+	ldp x23, x24, [x0, #48]
+	ldp x25, x26, [x0, #64]
+	ldp x27, x28, [x0, #80]
+	ldr x29, [x0, #96]
+	ldp d8, d9, [x0, #112]
+	ldp d10, d11, [x0, #128]
+	ldp d12, d13, [x0, #144]
+	ldp d14, d15, [x0, #160]
+	mov w0, w1
+	br x30
+)");
+
+#endif
+
+#endif // __WIN32