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/* Save current context.
Copyright (C) 2005-2021 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "ucontext_i.h"
/* int __getcontext (ucontext_t *uc); */
.text
.align 5
ENTRY(__getcontext)
/* Return value of getcontext. R0 is the only register whose
value is not preserved. */
mov #0, r0
mov.l r0, @(oR0,r4)
mov.l r1, @(oR1,r4)
mov.l r2, @(oR2,r4)
mov.l r3, @(oR3,r4)
mov.l r4, @(oR4,r4)
mov.l r5, @(oR5,r4)
mov.l r6, @(oR6,r4)
mov.l r7, @(oR7,r4)
mov r4, r0
add #(oMACL+4), r0
sts.l macl, @-r0
sts.l mach, @-r0
stc.l gbr, @-r0
/* Save T flag to SR. */
movt r1
mov.l r1, @-r0
sts.l pr, @-r0
/* The return address of getcontext is the restart pc. */
sts.l pr, @-r0
mov.l r15, @-r0
mov.l r14, @-r0
mov.l r13, @-r0
mov.l r12, @-r0
mov.l r11, @-r0
mov.l r10, @-r0
mov.l r9, @-r0
mov.l r8, @-r0
/* sigprocmask (SIG_BLOCK, NULL, &uc->uc_sigmask). */
mov r4, r6
add #oSIGMASK, r6
mov #SIG_BLOCK, r4
mov #0, r5
mov #+SYS_ify(sigprocmask), r3
trapa #0x13
mov r0, r1
mov #-12, r2
shad r2, r1
not r1, r1 // r1=0 means r0 = -1 to -4095
tst r1, r1 // i.e. error in linux
bf .Lgetcontext_end
.Lsyscall_error:
SYSCALL_ERROR_HANDLER
.Lgetcontext_end:
/* All done, return 0 for success. */
mov #0, r0
.Lpseudo_end:
rts
nop
PSEUDO_END(__getcontext)
weak_alias (__getcontext, getcontext)
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