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/* Create new context.
Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "ucontext_i.h"
/* void __makecontext (struct ucontext *ucp, void (*func)(), int argc, ...);
__makecontext sets up a stack and registers for context to run a given
function. The registers are set up like this:
r4-r7: parameters 1 to 4
r8 : uc_link from ucontext structure
pc : (*func) pointer
pr : address of exitcode
r15 : stack pointer for func. */
.text
.align 5
ENTRY(__makecontext)
mov #4, r3
mov.l @(oSS_SP,r4), r1
mov.l @(oSS_SIZE,r4), r2
add r1, r2
cmp/gt r6, r3
bf/s 1f
shlr2 r2
sub r6, r2
add r3, r2
1:
shll2 r2
mov #oR15, r0
mov.l @(oLINK,r4), r1
mov.l r2, @(r0,r4)
mov.l r1, @(oR8,r4)
mov #oPC, r0
mov.l r5, @(r0,r4)
cmp/pl r6
bf/s .L1
dt r6
mov.l r7, @(oR4,r4)
cmp/pl r6
bf/s .L1
dt r6
mov.l @(0,r15), r1
mov.l r1, @(oR5,r4)
cmp/pl r6
bf/s .L1
dt r6
mov.l @(4,r15), r1
mov.l r1, @(oR6,r4)
cmp/pl r6
bf/s .L1
dt r6
mov.l @(8,r15), r1
mov.l r1, @(oR7,r4)
mov #12,r0
.L0:
cmp/pl r6
bf/s .L1
dt r6
mov.l @(r0,r15), r1
mov.l r1, @r2
add #4, r0
bra .L0
add #4, r2
.L1:
#ifdef PIC
mova .Lexitcode, r0
#else
mov.l .L2, r0
#endif
add #oPR, r4
rts
mov.l r0, @r4
#ifndef PIC
.align 2
.L2:
.long .Lexitcode
#endif
cfi_endproc
.align 5
.Lexitcode:
tst r8, r8
bt/s 2f
mov r8, r4
#ifdef PIC
mova .Lgot, r0
mov.l .Lgot, r12
add r0, r12
mov.l .L3, r1
bsrf r1
.LPCS0:
nop
#else
mov.l .L3, r1
jsr @r1
nop
#endif
2:
mov.l .L4, r1
#ifdef PIC
add r12, r1
#endif
jsr @r1
mov r0, r4
0:
bra 0b
nop
.align 2
#ifdef PIC
.Lgot:
.long _GLOBAL_OFFSET_TABLE_
.L3:
.long __setcontext@PLT-(.LPCS0+2-(.))
.L4:
.long HIDDEN_JUMPTARGET(exit)@GOTOFF
#else
.L3:
.long __setcontext
.L4:
.long HIDDEN_JUMPTARGET(exit)
#endif
cfi_startproc
PSEUDO_END(__makecontext)
weak_alias (__makecontext, makecontext)
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