mirror of
https://github.com/RetroDECK/Duckstation.git
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63 lines
2.1 KiB
NASM
63 lines
2.1 KiB
NASM
_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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ret
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fastjmp_set ENDP
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; void fastjmp_jmp(fastjmp_buf*)
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fastjmp_jmp PROC
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mov rax, 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 rax
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fastjmp_jmp ENDP
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_TEXT ENDS
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END |