Edit: switch_x64_masm.asm
; ; stack switching code for MASM on x641 ; Kristjan Valur Jonsson, sept 2005 ; ;prototypes for our calls slp_save_state_asm PROTO slp_restore_state_asm PROTO pushxmm MACRO reg sub rsp, 16 .allocstack 16 movaps [rsp], reg ; faster than movups, but we must be aligned ; .savexmm128 reg, offset (don't know what offset is, no documentation) ENDM popxmm MACRO reg movaps reg, [rsp] ; faster than movups, but we must be aligned add rsp, 16 ENDM pushreg MACRO reg push reg .pushreg reg ENDM popreg MACRO reg pop reg ENDM .code slp_switch PROC FRAME ;realign stack to 16 bytes after return address push, makes the following faster sub rsp,8 .allocstack 8 pushxmm xmm15 pushxmm xmm14 pushxmm xmm13 pushxmm xmm12 pushxmm xmm11 pushxmm xmm10 pushxmm xmm9 pushxmm xmm8 pushxmm xmm7 pushxmm xmm6 pushreg r15 pushreg r14 pushreg r13 pushreg r12 pushreg rbp pushreg rbx pushreg rdi pushreg rsi sub rsp, 10h ;allocate the singlefunction argument (must be multiple of 16) .allocstack 10h .endprolog lea rcx, [rsp+10h] ;load stack base that we are saving call slp_save_state_asm ;pass stackpointer, return offset in eax cmp rax, 1 je EXIT1 cmp rax, -1 je EXIT2 ;actual stack switch: add rsp, rax call slp_restore_state_asm xor rax, rax ;return 0 EXIT: add rsp, 10h popreg rsi popreg rdi popreg rbx popreg rbp popreg r12 popreg r13 popreg r14 popreg r15 popxmm xmm6 popxmm xmm7 popxmm xmm8 popxmm xmm9 popxmm xmm10 popxmm xmm11 popxmm xmm12 popxmm xmm13 popxmm xmm14 popxmm xmm15 add rsp, 8 ret EXIT1: mov rax, 1 jmp EXIT EXIT2: sar rax, 1 jmp EXIT slp_switch ENDP END
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