diff options
Diffstat (limited to 'coroutine/win32')
-rw-r--r-- | coroutine/win32/Context.asm | 43 | ||||
-rw-r--r-- | coroutine/win32/Context.h | 64 |
2 files changed, 107 insertions, 0 deletions
diff --git a/coroutine/win32/Context.asm b/coroutine/win32/Context.asm new file mode 100644 index 0000000000..aa27099cfe --- /dev/null +++ b/coroutine/win32/Context.asm @@ -0,0 +1,43 @@ +;; +;; win32.asm +;; File 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. All rights reserved. +;; + +.model flat + +.code + +; 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 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 + + ; 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 diff --git a/coroutine/win32/Context.h b/coroutine/win32/Context.h new file mode 100644 index 0000000000..e5283cd4b0 --- /dev/null +++ b/coroutine/win32/Context.h @@ -0,0 +1,64 @@ +// +// win32.h +// File 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. All rights reserved. +// + +#pragma once + +#include <assert.h> +#include <string.h> + +#if __cplusplus +extern "C" { +#endif + +#define COROUTINE void __fastcall + +const size_t COROUTINE_REGISTERS = 4; + +// The fiber context (stack pointer). +struct coroutine_context +{ + void **stack_pointer; +}; + +// The initialization function. +typedef void(__fastcall * coroutine_start)(coroutine_context *from, coroutine_context *self); + +inline void coroutine_initialize( + coroutine_context *context, + coroutine_start start, + void *stack_pointer, + size_t stack_size +) { + context->stack_pointer = (void**)stack_pointer; + + if (!start) { + assert(!context->stack_pointer); + /* We are main coroutine for this thread */ + return; + } + + /* Windows Thread Information Block */ + *--context->stack_pointer = 0; + *--context->stack_pointer = stack_pointer; + *--context->stack_pointer = (void*)stack_size; + + *--context->stack_pointer = (void*)start; + + context->stack_pointer -= COROUTINE_REGISTERS; + memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS); +} + +coroutine_context * __fastcall coroutine_transfer(coroutine_context * current, coroutine_context * target); + +inline void coroutine_destroy(coroutine_context * context) +{ +} + +#if __cplusplus +} +#endif
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