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Diffstat (limited to 'coroutine/win32/Context.asm')
| -rw-r--r-- | coroutine/win32/Context.asm | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/coroutine/win32/Context.asm b/coroutine/win32/Context.asm new file mode 100644 index 0000000000..f8f431239b --- /dev/null +++ b/coroutine/win32/Context.asm @@ -0,0 +1,55 @@ +;; +;; This file is part of the "Coroutine" project and released under the MIT License. +;; +;; Created by Samuel Williams on 10/5/2018. +;; Copyright, 2018, by Samuel Williams. +;; + +.386 +.model flat + +.code + +assume fs:nothing + +; Using fastcall is a big win (and it's the same has how x64 works). +; In coroutine transfer, the arguments are passed in ecx and edx. We don't need +; to touch these in order to pass them to the destination coroutine. + +@coroutine_transfer@8 proc + ; Save the thread information block: + push fs:[0] + push fs:[4] + push fs:[8] + + ; Save caller registers: + push ebp + push ebx + push edi + push esi + + ; Save caller stack pointer: + mov dword ptr [ecx], esp + + ; Restore callee stack pointer: + mov esp, dword ptr [edx] + + ; Restore callee stack: + pop esi + pop edi + pop ebx + pop ebp + + ; Restore the thread information block: + pop fs:[8] + pop fs:[4] + pop fs:[0] + + ; Save the first argument as the return value: + mov eax, dword ptr ecx + + ; Jump to the address on the stack: + ret +@coroutine_transfer@8 endp + +end |