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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 "sparc.S"
.section ".text"
/* Stack structure is:
+4 : cur_length
+0 : cur_sp
-4 : return address
-8 : process function to be executed
-12: function argument
...
-72: %sp
*/
/* Function called to loop on the process. */
.align 4
.type grt_stack_loop,#function
grt_stack_loop:
ld [%sp + 64], %o1
jmpl %o1 + 0, %o7
ld [%sp + 68], %o0
ba grt_stack_loop
nop
.size grt_stack_loop, . - grt_stack_loop
/* function Stack_Create (Func : Address; Arg : Address)
return Stack_Type; */
.align 4
.global grt_stack_create
.type grt_stack_create,#function
grt_stack_create:
/* Standard prologue. */
save %sp,-80,%sp
/* Allocate the stack, and exit in case of failure */
call grt_stack_allocate
nop
cmp %o0, 0
be .Ldone
nop
/* Note: %o0 contains the address of the stack_context. This is
also the top of the stack. */
/* Prepare stack. */
/* The return function. */
sethi %hi(grt_stack_loop - 8), %l2
or %lo(grt_stack_loop - 8), %l2, %l2
/* Create a frame for grt_stack_loop. */
sub %o0, (64 + 8), %l1
/* The function to be executed. */
st %i0, [%l1 + 64]
/* The argument. */
st %i1, [%l1 + 68]
/* Create a frame for grt_stack_switch. */
sub %l1, 64, %l0
/* Save frame pointer. */
st %l1, [%l0 + 56]
/* Save return address. */
st %l2, [%l0 + 60]
/* Save stack pointer. */
st %l0, [%o0]
.Ldone:
ret
restore %o0, %g0, %o0
.size grt_stack_create,. - grt_stack_create
.align 4
.global grt_stack_switch
/* Arguments: TO, FROM.
Both are pointers to a stack_context. */
.type grt_stack_switch,#function
grt_stack_switch:
/* Standard prologue. */
save %sp,-80,%sp
/* Flush and invalidate windows.
It is not clear wether the current window is saved or not,
therefore, I assume it is not.
*/
ta 3
/* Only IN registers %fp and %i7 (return address) must be saved.
Of course, I could use std/ldd, but it is not as clear
*/
/* Save current frame pointer. */
st %fp, [%sp + 56]
/* Save return address. */
st %i7, [%sp + 60]
/* Save stack pointer. */
st %sp, [%i1]
/* Load stack pointer. */
ld [%i0], %sp
/* Load return address. */
ld [%sp + 60], %i7
/* Load frame pointer. */
ld [%sp + 56], %fp
/* Return. */
ret
restore
.size grt_stack_switch, . - grt_stack_switch
.ident "Written by T.Gingold"
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