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/* GRT stack implementation for x86.
Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold.
GHDL is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
.file "i386.S"
.version "01.01"
.text
/* Function called to loop on the process. */
.align 4
.type grt_stack_loop,@function
grt_stack_loop:
call *4(%esp)
jmp grt_stack_loop
.size grt_stack_loop, . - grt_stack_loop
/* function Stack_Create (Func : Address; Arg : Address)
return Stack_Type;
*/
.align 4
.globl grt_stack_create
.type grt_stack_create,@function
grt_stack_create:
/* Standard prologue. */
pushl %ebp
movl %esp,%ebp
/* Keep aligned (call + pushl + 8 = 16 bytes). */
subl $8,%esp
/* Allocate the stack, and exit in case of failure */
call grt_stack_allocate
testl %eax,%eax
je .Ldone
/* Note: %EAX contains the address of the stack_context. This is
also the top of the stack. */
/* Prepare stack. */
/* The function to be executed. */
movl 8(%ebp), %ecx
movl %ecx, -4(%eax)
/* The argument. */
movl 12(%ebp), %ecx
movl %ecx, -8(%eax)
/* The return function. */
movl $grt_stack_loop, -12(%eax)
/* The context. */
movl %ebx, -16(%eax)
movl %esi, -20(%eax)
movl %edi, -24(%eax)
movl %ebp, -28(%eax)
/* Save the new stack pointer to the stack context. */
leal -28(%eax), %ecx
movl %ecx, (%eax)
.Ldone:
leave
ret
.size grt_stack_create,. - grt_stack_create
.align 4
.globl grt_stack_switch
/* Arguments: TO, FROM
Both are pointers to a stack_context. */
.type grt_stack_switch,@function
grt_stack_switch:
/* TO -> ECX. */
movl 4(%esp), %ecx
/* FROM -> EDX. */
movl 8(%esp), %edx
/* Save call-used registers. */
pushl %ebx
pushl %esi
pushl %edi
pushl %ebp
/* Save the current stack. */
movl %esp, (%edx)
/* Stack switch. */
movl (%ecx), %esp
/* Restore call-used registers. */
popl %ebp
popl %edi
popl %esi
popl %ebx
/* Run. */
ret
.size grt_stack_switch, . - grt_stack_switch
.ident "Written by T.Gingold"
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