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-/* i386.s -- assembly support. */
-
-/*
-// QuickThreads -- Threads-building toolkit.
-// Copyright (c) 1993 by David Keppel
-//
-// 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 with '/*' and '//' 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. */
-
-
- .text
- .align 2
-
- .globl _qt_abort
- .globl qt_abort
- .globl _qt_block
- .globl qt_block
- .globl _qt_blocki
- .globl 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:
- pushl %ebp /* Save callee-save, sp-=4. */
- pushl %esi /* Save callee-save, sp-=4. */
- pushl %edi /* Save callee-save, sp-=4. */
- pushl %ebx /* Save callee-save, sp-=4. */
- movl %esp, %eax /* Remember old stack pointer. */
-
-qt_common:
- movl 32(%esp), %esp /* Move to new thread. */
- pushl 28(%eax) /* Push arg 2. */
- pushl 24(%eax) /* Push arg 1. */
- pushl %eax /* Push arg 0. */
- movl 20(%eax), %ebx /* Get function to call. */
- call *%ebx /* Call f. */
- addl $12, %esp /* Pop args. */
-
- popl %ebx /* Restore callee-save, sp+=4. */
- popl %edi /* Restore callee-save, sp+=4. */
- popl %esi /* Restore callee-save, sp+=4. */
- popl %ebp /* Restore callee-save, sp+=4. */
- ret /* Resume the stopped function. */
- hlt
-
-
-/* Start a varargs thread. */
-
- .globl _qt_vstart
- .globl qt_vstart
-_qt_vstart:
-qt_vstart:
- pushl %edi /* Push `pt' arg to `startup'. */
- call *%ebp /* Call `startup'. */
- popl %eax /* Clean up the stack. */
-
- call *%ebx /* Call the user's function. */
-
- pushl %eax /* Push return from user's. */
- pushl %edi /* Push `pt' arg to `cleanup'. */
- call *%esi /* Call `cleanup'. */
-
- hlt /* `cleanup' never returns. */