mirror of
https://github.com/RetroDECK/Duckstation.git
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167 lines
3 KiB
C++
167 lines
3 KiB
C++
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// SPDX-FileCopyrightText: 2021 Connor McLaughlin <stenzek@gmail.com>
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// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
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#ifndef _WIN32
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#include "fastjmp.h"
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#if defined(__APPLE__)
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#define PREFIX "_"
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#else
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#define PREFIX ""
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#endif
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#if defined(__x86_64__)
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asm("\t.global " PREFIX "fastjmp_set\n"
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"\t.global " PREFIX "fastjmp_jmp\n"
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"\t.text\n"
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"\t" PREFIX "fastjmp_set:"
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R"(
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movq 0(%rsp), %rax
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movq %rsp, %rdx # fixup stack pointer, so it doesn't include the call to fastjmp_set
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addq $8, %rdx
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movq %rax, 0(%rdi) # actually rip
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movq %rbx, 8(%rdi)
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movq %rdx, 16(%rdi) # actually rsp
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movq %rbp, 24(%rdi)
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movq %r12, 32(%rdi)
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movq %r13, 40(%rdi)
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movq %r14, 48(%rdi)
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movq %r15, 56(%rdi)
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xorl %eax, %eax
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ret
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)"
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"\t" PREFIX "fastjmp_jmp:"
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R"(
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movl %esi, %eax
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movq 0(%rdi), %rdx # actually rip
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movq 8(%rdi), %rbx
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movq 16(%rdi), %rsp # actually rsp
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movq 24(%rdi), %rbp
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movq 32(%rdi), %r12
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movq 40(%rdi), %r13
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movq 48(%rdi), %r14
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movq 56(%rdi), %r15
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jmp *%rdx
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)");
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#elif defined(__aarch64__)
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asm(
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"\t.global " PREFIX "fastjmp_set\n"
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"\t.global " PREFIX "fastjmp_jmp\n"
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"\t.text\n"
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"\t.align 16\n"
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"\t" PREFIX "fastjmp_set:" R"(
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mov x16, sp
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stp x16, x30, [x0]
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stp x19, x20, [x0, #16]
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stp x21, x22, [x0, #32]
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stp x23, x24, [x0, #48]
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stp x25, x26, [x0, #64]
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stp x27, x28, [x0, #80]
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str x29, [x0, #96]
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stp d8, d9, [x0, #112]
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stp d10, d11, [x0, #128]
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stp d12, d13, [x0, #144]
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stp d14, d15, [x0, #160]
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mov w0, wzr
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br x30
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)"
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".align 16\n"
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"\t" PREFIX "fastjmp_jmp:" R"(
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ldp x16, x30, [x0]
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mov sp, x16
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ldp x19, x20, [x0, #16]
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ldp x21, x22, [x0, #32]
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ldp x23, x24, [x0, #48]
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ldp x25, x26, [x0, #64]
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ldp x27, x28, [x0, #80]
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ldr x29, [x0, #96]
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ldp d8, d9, [x0, #112]
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ldp d10, d11, [x0, #128]
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ldp d12, d13, [x0, #144]
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ldp d14, d15, [x0, #160]
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mov w0, w1
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br x30
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)");
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#elif defined(__riscv) && __riscv_xlen == 64
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asm(
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"\t.global " PREFIX "fastjmp_set\n"
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"\t.global " PREFIX "fastjmp_jmp\n"
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"\t.text\n"
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"\t.align 16\n"
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"\t" PREFIX "fastjmp_set:" R"(
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sd sp, 0(a0)
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sd s0, 8(a0)
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sd s1, 16(a0)
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sd s2, 24(a0)
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sd s3, 32(a0)
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sd s4, 40(a0)
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sd s5, 48(a0)
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sd s6, 56(a0)
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sd s7, 64(a0)
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sd s8, 72(a0)
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sd s9, 80(a0)
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sd s10, 88(a0)
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sd s11, 96(a0)
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fsd fs0, 104(a0)
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fsd fs1, 112(a0)
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fsd fs2, 120(a0)
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fsd fs3, 128(a0)
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fsd fs4, 136(a0)
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fsd fs5, 144(a0)
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fsd fs6, 152(a0)
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fsd fs7, 160(a0)
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fsd fs8, 168(a0)
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fsd fs9, 176(a0)
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fsd fs10, 184(a0)
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fsd fs11, 192(a0)
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sd ra, 208(a0)
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li a0, 0
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jr ra
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)"
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".align 16\n"
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"\t" PREFIX "fastjmp_jmp:" R"(
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ld ra, 208(a0)
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fld fs11, 192(a0)
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fld fs10, 184(a0)
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fld fs9, 176(a0)
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fld fs8, 168(a0)
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fld fs7, 160(a0)
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fld fs6, 152(a0)
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fld fs5, 144(a0)
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fld fs4, 136(a0)
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fld fs3, 128(a0)
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fld fs2, 120(a0)
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fld fs1, 112(a0)
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fld fs0, 104(a0)
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ld s11, 96(a0)
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ld s10, 88(a0)
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ld s9, 80(a0)
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ld s8, 72(a0)
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ld s7, 64(a0)
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ld s6, 56(a0)
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ld s5, 48(a0)
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ld s4, 40(a0)
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ld s3, 32(a0)
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ld s2, 24(a0)
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ld s1, 16(a0)
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ld s0, 8(a0)
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ld sp, 0(a0)
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mv a0, a1
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jr ra
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)");
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#else
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#error Unknown platform.
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#endif
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#endif // __WIN32
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