36 lines
943 B
NASM
36 lines
943 B
NASM
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global setjmp
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; int setjmp(jmp_buf env);
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setjmp:
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mov ecx, [esp + 4] ; ecx = env
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mov edx, [esp + 0] ; edx = ret addr
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mov [ecx + 0], edx
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mov [ecx + 4], ebx
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mov [ecx + 8], esp
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mov [ecx + 12], ebp
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mov [ecx + 16], esi
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mov [ecx + 20], edi
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mov [ecx + 24], eax ; eax = trigblock()'s ret val
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xor eax, eax ; setjmp ret val = 0
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ret
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global longjmp
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; void longjmp(jmp_buf env, int val)
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longjmp:
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mov edx, [esp + 4] ; edx = env
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mov eax, [esp + 8] ; eax = val
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mov ecx, [edx + 0] ; ecx = setjmp()'s ret val
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mov ebx, [edx + 4]
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mov esp, [edx + 8]
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mov ebp, [edx + 12]
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mov esi, [edx + 16]
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mov edi, [edx + 20]
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; make sure longjmp's ret val not 0
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test eax, eax ; if eax == 0:
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jnz .1 ; eax += 1
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inc eax ; else: goto lable 1
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.1: ; let longjmp's ret addr as setjmp's ret addr
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mov [esp + 0], ecx ; ret addr = ecx = setjmp's next code
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ret
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