2015-01-18 06:29:12 +00:00
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/* Set current context.
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2023-01-06 21:08:04 +00:00
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Copyright (C) 2015-2023 Free Software Foundation, Inc.
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2015-01-18 06:29:12 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2015-01-18 06:29:12 +00:00
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#include <sysdep.h>
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#include "ucontext_i.h"
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/* int setcontext (const ucontext_t *ucp) */
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.text
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ENTRY(__setcontext)
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ldw r5, UCONTEXT_FLAGS(r4)
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movi r6, 1
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bne r5, r6, .Lsigreturn
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mov r10, r4
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/* Restore signal mask. */
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2015-07-25 06:19:50 +00:00
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
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2015-01-18 06:29:12 +00:00
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movi r7, _NSIG8
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2015-07-25 06:19:50 +00:00
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addi r5, r4, UCONTEXT_SIGMASK
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mov r6, zero
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2015-01-18 06:29:12 +00:00
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movi r4, SIG_SETMASK
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movi r2, SYS_ify (rt_sigprocmask)
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trap
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bne r7, zero, SYSCALL_ERROR_LABEL
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/* Restore argument registers, for the makecontext() case. */
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ldw r4, (UCONTEXT_MCONTEXT + 4*4)(r10)
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ldw r5, (UCONTEXT_MCONTEXT + 5*4)(r10)
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ldw r6, (UCONTEXT_MCONTEXT + 6*4)(r10)
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ldw r7, (UCONTEXT_MCONTEXT + 7*4)(r10)
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ldw r16, (UCONTEXT_MCONTEXT + 16*4)(r10)
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ldw r17, (UCONTEXT_MCONTEXT + 17*4)(r10)
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ldw r18, (UCONTEXT_MCONTEXT + 18*4)(r10)
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ldw r19, (UCONTEXT_MCONTEXT + 19*4)(r10)
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ldw r20, (UCONTEXT_MCONTEXT + 20*4)(r10)
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ldw r21, (UCONTEXT_MCONTEXT + 21*4)(r10)
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ldw r22, (UCONTEXT_MCONTEXT + 22*4)(r10)
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ldw ra, (UCONTEXT_MCONTEXT + 24*4)(r10)
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ldw fp, (UCONTEXT_MCONTEXT + 25*4)(r10)
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ldw gp, (UCONTEXT_MCONTEXT + 26*4)(r10)
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/* Load address to continue execution. */
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ldw r3, (UCONTEXT_MCONTEXT + 28*4)(r10)
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ldw sp, (UCONTEXT_MCONTEXT + 29*4)(r10)
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mov r2, zero
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jmp r3
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.Lsigreturn:
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addi sp, sp, -RT_SIGFRAME_SIZE
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cfi_adjust_cfa_offset (RT_SIGFRAME_SIZE)
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addi r2, sp, RT_SIGFRAME_UCONTEXT
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movi r3, UCONTEXT_SIZE-4
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1:
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add r6, r4, r3
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ldw r5, 0(r6)
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add r7, r2, r3
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addi r3, r3, -4
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stw r5, 0(r7)
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bgt r3, zero, 1b
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movi r2, SYS_ify (rt_sigreturn)
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trap
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addi sp, sp, RT_SIGFRAME_SIZE
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cfi_adjust_cfa_offset (-RT_SIGFRAME_SIZE)
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br SYSCALL_ERROR_LABEL
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PSEUDO_END (__setcontext)
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weak_alias (__setcontext, setcontext)
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2016-04-25 07:08:17 +00:00
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/* We add an NOP here to separate between __setcontext/__startcontext.
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The wanted behavior that happens is: when unwinding from a function
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called inside a makecontext() context, FDE lookup will use
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'&__startcontext - 1', then returns NULL for no FDE found,
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and immediately ends the unwind, in a normal fashion.
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If this NOP word does not exist, FDE lookup just repeatedly finds
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__setcontext's FDE in an infinite loop, due to the convention of
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2023-05-23 10:50:31 +00:00
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using 'address - 1' for FDE lookup. Modifying/deleting the below
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2016-04-25 07:08:17 +00:00
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__startcontext's FDE has no help on this. */
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nop
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2015-01-18 06:29:12 +00:00
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ENTRY(__startcontext)
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mov r4, r16
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bne r4, zero, __setcontext
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2015-05-08 15:20:32 +00:00
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/* If uc_link == zero, call exit. */
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2015-01-18 06:29:12 +00:00
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#ifdef PIC
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nextpc r22
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1: movhi r8, %hiadj(_gp_got - 1b)
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addi r8, r8, %lo(_gp_got - 1b)
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add r22, r22, r8
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2015-05-08 15:20:32 +00:00
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ldw r8, %call(HIDDEN_JUMPTARGET(exit))(r22)
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2015-01-18 06:29:12 +00:00
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jmp r8
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#else
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2015-05-08 15:20:32 +00:00
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jmpi exit
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2015-01-18 06:29:12 +00:00
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#endif
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END(__startcontext)
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