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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65834 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
43 lines
871 B
NASM
43 lines
871 B
NASM
;;
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;; win32.asm
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;; File file is part of the "Coroutine" project and released under the MIT License.
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;;
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;; Created by Samuel Williams on 10/5/2018.
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;; Copyright, 2018, by Samuel Williams. All rights reserved.
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;;
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.model flat
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.code
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; Using fastcall is a big win (and it's the same has how x64 works).
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; In coroutine transfer, the arguments are passed in ecx and edx. We don't need
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; to touch these in order to pass them to the destination coroutine.
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@coroutine_transfer@8 proc
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; Save caller registers
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push ebp
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push ebx
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push edi
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push esi
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; Save caller stack pointer
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mov dword ptr [ecx], esp
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; Restore callee stack pointer
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mov esp, dword ptr [edx]
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; Restore callee stack
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pop esi
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pop edi
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pop ebx
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pop ebp
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; Save the first argument as the return value
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mov eax, dword ptr ecx
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; Jump to the address on the stack
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ret
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@coroutine_transfer@8 endp
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end
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