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-;; i386.asm -- assembly support.
-
-;;
-;; QuickThreads -- Threads-building toolkit.
-;; Copyright (c) 2001 Free Software Foundation, Inc.
-;;
-;; Permission to use, copy, modify and distribute this software and
-;; its documentation for any purpose and without fee is hereby
-;; granted, provided that the above copyright notice and this notice
-;; appear in all copies. This software is provided as a
-;; proof-of-concept and for demonstration purposes; there is no
-;; representation about the suitability of this software for any
-;; purpose.
-
-;; NOTE: double-labeled `_name' and `name' for System V compatability.
-;; NOTE: Comment lines start like this one, or with '//' ONLY. Sorry!
-
-;; Callee-save: %esi, %edi, %ebx, %ebp
-;; Caller-save: %eax, %ecx
-;; Can't tell: %edx (seems to work w/o saving it.)
-;;
-;; Assignment:
-;;
-;; See ``i386.h'' for the somewhat unconventional stack layout.
-
-
- .386p
- .model flat
- .code
-
- public _qt_abort
- public qt_abort
- public _qt_block
- public qt_block
- public _qt_blocki
- public qt_blocki
-
-;; These all have the type signature
-;;
-;; void *blocking (helper, arg0, arg1, new)
-;;
-;; On procedure entry, the helper is at 4(sp), args at 8(sp) and
-;; 12(sp) and the new thread's sp at 16(sp). It *appears* that the
-;; calling convention for the 8X86 requires the caller to save all
-;; floating-point registers, this makes our life easy.
-
-;; Halt the currently-running thread. Save it's callee-save regs on
-;; to the stack, 32 bytes. Switch to the new stack (next == 16+32(sp))
-;; and call the user function (f == 4+32(sp) with arguments: old sp
-;; arg1 (8+32(sp)) and arg2 (12+32(sp)). When the user function is
-;; done, restore the new thread's state and return.
-;;
-;; `qt_abort' is (currently) an alias for `qt_block' because most of
-;; the work is shared. We could save the insns up to `qt_common' by
-;; replicating, but w/o replicating we need an inital subtract (to
-;; offset the stack as if it had been a qt_block) and then a jump
-;; to qt_common. For the cost of a jump, we might as well just do
-;; all the work.
-;;
-;; The helper function (4(sp)) can return a void* that is returned
-;; by the call to `qt_blockk{,i}'. Since we don't touch %eax in
-;; between, we get that ``for free''.
-
-_qt_abort:
-qt_abort:
-_qt_block:
-qt_block:
-_qt_blocki:
-qt_blocki:
- push ebp ; Save callee-save, sp-=4.
- push esi ; Save callee-save, sp-=4.
- push edi ; Save callee-save, sp-=4.
- push ebx ; Save callee-save, sp-=4.
- mov eax, esp ; Remember old stack pointer.
-
-qt_common:
- mov esp, [esp+32] ; Move to new thread.
- push [eax+28] ; Push arg 2.
- push [eax+24] ; Push arg 1.
- push eax ; Push arg 0.
- mov ebx, [eax+20] ; Get function to call.
- call ebx ; Call f.
- add esp, 12 ; Pop args.
-
- pop ebx ; Restore callee-save, sp+=4.
- pop edi ; Restore callee-save, sp+=4.
- pop esi ; Restore callee-save, sp+=4.
- pop ebp ; Restore callee-save, sp+=4.
- ret ; Resume the stopped function.
- hlt
-
-
-;; Start a varargs thread.
-
- public _qt_vstart
- public qt_vstart
-
-_qt_vstart:
-qt_vstart:
- push edi ; Push `pt' arg to `startup'.
- call ebp ; Call `startup'.
- pop eax ; Clean up the stack.
-
- call ebx ; Call the user's function.
-
- push eax ; Push return from user's.
- push edi ; Push `pt' arg to `cleanup'.
- call esi ; Call `cleanup'.
-
- hlt ; `cleanup' never returns.
-
- end