CoCalc -- fastjmp

GitHub Repository: stenzek/duckstation
Path: blob/master/src/common/fastjmp_x86.asm
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; SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
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; SPDX-License-Identifier: CC-BY-NC-ND-4.0
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IFDEF _M_X86_32
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; -----------------------------------------
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; 32-bit X86
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; -----------------------------------------
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  .386
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  .model flat
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_TEXT         SEGMENT
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PUBLIC @fastjmp_set@4
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PUBLIC @fastjmp_jmp@8
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; void fastjmp_set(fastjmp_buf*)
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@fastjmp_set@4   PROC
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  mov eax, dword ptr [esp]
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  mov edx, esp                              ; fixup stack pointer, so it doesn't include the call to fastjmp_set
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  add edx, 4
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  mov dword ptr [ecx], eax                  ; actually eip
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  mov dword ptr [ecx + 4], ebx
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  mov dword ptr [ecx + 8], edx              ; actually esp
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  mov dword ptr [ecx + 12], ebp
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  mov dword ptr [ecx + 16], esi
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  mov dword ptr [ecx + 20], edi
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  xor eax, eax
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  ret
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@fastjmp_set@4   ENDP
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; void __fastcall fastjmp_jmp(fastjmp_buf*, int)
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@fastjmp_jmp@8   PROC
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  mov eax, edx                              ; return code
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  mov edx, dword ptr [ecx + 0]
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  mov ebx, dword ptr [ecx + 4]
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  mov esp, dword ptr [ecx + 8]
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  mov ebp, dword ptr [ecx + 12]
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  mov esi, dword ptr [ecx + 16]
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  mov edi, dword ptr [ecx + 20]
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  jmp edx
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@fastjmp_jmp@8   ENDP
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_TEXT         ENDS
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ENDIF      ; _M_X86_32
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IFDEF _M_X86_64
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; -----------------------------------------
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; 64-bit X86
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; -----------------------------------------
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_TEXT         SEGMENT
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PUBLIC fastjmp_set
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PUBLIC fastjmp_jmp
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; void fastjmp_set(fastjmp_buf*)
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fastjmp_set   PROC
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  mov rax, qword ptr [rsp]
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  mov rdx, rsp                              ; fixup stack pointer, so it doesn't include the call to fastjmp_set
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  add rdx, 8
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  mov qword ptr [rcx], rax                  ; actually rip
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  mov qword ptr [rcx + 8], rbx
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  mov qword ptr [rcx + 16], rdx             ; actually rsp
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  mov qword ptr [rcx + 24], rbp
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  mov qword ptr [rcx + 32], rsi
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  mov qword ptr [rcx + 40], rdi
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  mov qword ptr [rcx + 48], r12
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  mov qword ptr [rcx + 56], r13
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  mov qword ptr [rcx + 64], r14
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  mov qword ptr [rcx + 72], r15
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  movaps xmmword ptr [rcx + 80], xmm6
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  movaps xmmword ptr [rcx + 96], xmm7
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  movaps xmmword ptr [rcx + 112], xmm8
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  add rcx, 112                              ; split to two batches to fit displacement in a single byte
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  movaps xmmword ptr [rcx + 16], xmm9
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  movaps xmmword ptr [rcx + 32], xmm10
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  movaps xmmword ptr [rcx + 48], xmm11
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  movaps xmmword ptr [rcx + 64], xmm12
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  movaps xmmword ptr [rcx + 80], xmm13
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  movaps xmmword ptr [rcx + 96], xmm14
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  movaps xmmword ptr [rcx + 112], xmm15
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  xor eax, eax
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  ret
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fastjmp_set   ENDP
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; void fastjmp_jmp(fastjmp_buf*, int)
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fastjmp_jmp   PROC
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  mov eax, edx                              ; return code
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  mov rdx, qword ptr [rcx + 0]              ; actually rip
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  mov rbx, qword ptr [rcx + 8]
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  mov rsp, qword ptr [rcx + 16]
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  mov rbp, qword ptr [rcx + 24]
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  mov rsi, qword ptr [rcx + 32]
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  mov rdi, qword ptr [rcx + 40]
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  mov r12, qword ptr [rcx + 48]
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  mov r13, qword ptr [rcx + 56]
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  mov r14, qword ptr [rcx + 64]
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  mov r15, qword ptr [rcx + 72]
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  movaps xmm6, xmmword ptr [rcx + 80]
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  movaps xmm7, xmmword ptr [rcx + 96]
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  movaps xmm8, xmmword ptr [rcx + 112]
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  add rcx, 112                              ; split to two batches to fit displacement in a single byte
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  movaps xmm9, xmmword ptr [rcx + 16]
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  movaps xmm10, xmmword ptr [rcx + 32]
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  movaps xmm11, xmmword ptr [rcx + 48]
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  movaps xmm12, xmmword ptr [rcx + 64]
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  movaps xmm13, xmmword ptr [rcx + 80]
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  movaps xmm14, xmmword ptr [rcx + 96]
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  movaps xmm15, xmmword ptr [rcx + 112]
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  jmp rdx
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fastjmp_jmp   ENDP
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_TEXT         ENDS
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ENDIF     ; _M_X86_64
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END
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