pcsx2/common/FastJmp.cpp

92 lines
1.8 KiB
C++

// SPDX-FileCopyrightText: 2002-2023 PCSX2 Dev Team
// SPDX-License-Identifier: LGPL-3.0+
#include "FastJmp.h"
#if !defined(_MSC_VER) || defined(__clang__)
#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