mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
116 lines
3.3 KiB
ArmAsm
116 lines
3.3 KiB
ArmAsm
/* Set current context.
|
|
Copyright (C) 2015-2021 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 setcontext (const ucontext_t *ucp) */
|
|
.text
|
|
ENTRY(__setcontext)
|
|
ldw r5, UCONTEXT_FLAGS(r4)
|
|
movi r6, 1
|
|
bne r5, r6, .Lsigreturn
|
|
|
|
mov r10, r4
|
|
|
|
/* Restore signal mask. */
|
|
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
|
|
movi r7, _NSIG8
|
|
addi r5, r4, UCONTEXT_SIGMASK
|
|
mov r6, zero
|
|
movi r4, SIG_SETMASK
|
|
movi r2, SYS_ify (rt_sigprocmask)
|
|
trap
|
|
bne r7, zero, SYSCALL_ERROR_LABEL
|
|
|
|
/* Restore argument registers, for the makecontext() case. */
|
|
ldw r4, (UCONTEXT_MCONTEXT + 4*4)(r10)
|
|
ldw r5, (UCONTEXT_MCONTEXT + 5*4)(r10)
|
|
ldw r6, (UCONTEXT_MCONTEXT + 6*4)(r10)
|
|
ldw r7, (UCONTEXT_MCONTEXT + 7*4)(r10)
|
|
|
|
ldw r16, (UCONTEXT_MCONTEXT + 16*4)(r10)
|
|
ldw r17, (UCONTEXT_MCONTEXT + 17*4)(r10)
|
|
ldw r18, (UCONTEXT_MCONTEXT + 18*4)(r10)
|
|
ldw r19, (UCONTEXT_MCONTEXT + 19*4)(r10)
|
|
ldw r20, (UCONTEXT_MCONTEXT + 20*4)(r10)
|
|
ldw r21, (UCONTEXT_MCONTEXT + 21*4)(r10)
|
|
ldw r22, (UCONTEXT_MCONTEXT + 22*4)(r10)
|
|
ldw ra, (UCONTEXT_MCONTEXT + 24*4)(r10)
|
|
ldw fp, (UCONTEXT_MCONTEXT + 25*4)(r10)
|
|
ldw gp, (UCONTEXT_MCONTEXT + 26*4)(r10)
|
|
/* Load address to continue execution. */
|
|
ldw r3, (UCONTEXT_MCONTEXT + 28*4)(r10)
|
|
ldw sp, (UCONTEXT_MCONTEXT + 29*4)(r10)
|
|
|
|
mov r2, zero
|
|
jmp r3
|
|
|
|
.Lsigreturn:
|
|
addi sp, sp, -RT_SIGFRAME_SIZE
|
|
cfi_adjust_cfa_offset (RT_SIGFRAME_SIZE)
|
|
|
|
addi r2, sp, RT_SIGFRAME_UCONTEXT
|
|
movi r3, UCONTEXT_SIZE-4
|
|
1:
|
|
add r6, r4, r3
|
|
ldw r5, 0(r6)
|
|
add r7, r2, r3
|
|
addi r3, r3, -4
|
|
stw r5, 0(r7)
|
|
bgt r3, zero, 1b
|
|
|
|
movi r2, SYS_ify (rt_sigreturn)
|
|
trap
|
|
|
|
addi sp, sp, RT_SIGFRAME_SIZE
|
|
cfi_adjust_cfa_offset (-RT_SIGFRAME_SIZE)
|
|
br SYSCALL_ERROR_LABEL
|
|
|
|
PSEUDO_END (__setcontext)
|
|
weak_alias (__setcontext, setcontext)
|
|
|
|
/* We add an NOP here to separate between __setcontext/__startcontext.
|
|
The wanted behavior that happens is: when unwinding from a function
|
|
called inside a makecontext() context, FDE lookup will use
|
|
'&__startcontext - 1', then returns NULL for no FDE found,
|
|
and immediately ends the unwind, in a normal fashion.
|
|
|
|
If this NOP word does not exist, FDE lookup just repeatedly finds
|
|
__setcontext's FDE in an infinite loop, due to the convention of
|
|
using 'address - 1' for FDE lookup. Modifiying/deleting the below
|
|
__startcontext's FDE has no help on this. */
|
|
nop
|
|
|
|
ENTRY(__startcontext)
|
|
mov r4, r16
|
|
bne r4, zero, __setcontext
|
|
|
|
/* If uc_link == zero, call exit. */
|
|
#ifdef PIC
|
|
nextpc r22
|
|
1: movhi r8, %hiadj(_gp_got - 1b)
|
|
addi r8, r8, %lo(_gp_got - 1b)
|
|
add r22, r22, r8
|
|
ldw r8, %call(HIDDEN_JUMPTARGET(exit))(r22)
|
|
jmp r8
|
|
#else
|
|
jmpi exit
|
|
#endif
|
|
END(__startcontext)
|