glibc/sysdeps/mach/hurd/i386/____longjmp_chk.S

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/* Copyright (C) 2001-2022 Free Software Foundation, Inc.
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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
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
<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <tcb-offsets.h>
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#include <asm-syntax.h>
#include <signal-defines.h>
/* #include <signal.h> */
#define SS_ONSTACK 1
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
longjmp_msg:
.string "longjmp causes uninitialized stack frame"
.size longjmp_msg, .-longjmp_msg
#ifdef PIC
# define CALL_FAIL movl %ebx, %ecx; /* TODO: what's this mov good for? */ \
cfi_register(%ebx,%ecx); \
LOAD_PIC_REG (bx); \
leal longjmp_msg@GOTOFF(%ebx), %eax; \
movl %eax, (%esp); \
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call HIDDEN_JUMPTARGET(__fortify_fail)
#else
# define CALL_FAIL movl $longjmp_msg, %eax; \
movl %eax, (%esp); \
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call HIDDEN_JUMPTARGET(__fortify_fail)
#endif
.text
ENTRY (____longjmp_chk)
movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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/* Save the return address now. */
movl (JB_PC*4)(%eax), %edx
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/* Get the stack pointer. */
movl (JB_SP*4)(%eax), %ecx
cfi_undefined(%ecx)
#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (%edx)
PTR_DEMANGLE (%ecx)
#endif
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movw %ds, %si
movw %gs, %di
cmpw %si, %di
jz .Lok /* TLS not initialized yet */
movl %gs:SIGSTATE_OFFSET, %edi
testl %edi, %edi
jz .Lok /* sigstate not initialized yet */
testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
jnz .Lonstack
/* We were on the main stack */
cmpl %ecx, %esp
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/* Jumping to a higher-address frame is always allowed. */
jbe .Lok
/* Otherwise it's not allowed. */
CALL_FAIL
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.Lonstack:
/* We were on the alternate stack, can't really easily check anything
since longjmp may get us out of the alternate stack. */
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cmpl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ecx
jb .Loks /* We jump below the alternate stack, switch. */
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movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ebx
addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%edi), %ebx
cmpl %ebx, %ecx
jb .Lok /* We jump inside the alternate stack, do not switch. */
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/* We jump above the alternate stack, switch. */
.Loks: /* We jump out of the alternate stack, clear SS_ONSTACK flag. */
andl $~(SS_ONSTACK), (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
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.Lok: /* We add unwind information for the target here. */
cfi_def_cfa(%eax, 0)
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cfi_register(%eip, %edx)
cfi_register(%esp, %ecx)
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cfi_offset(%ebx, JB_BX*4)
cfi_offset(%esi, JB_SI*4)
cfi_offset(%edi, JB_DI*4)
cfi_offset(%ebp, JB_BP*4)
/* Restore registers. */
movl (JB_BX*4)(%eax), %ebx
movl (JB_SI*4)(%eax), %esi
movl (JB_DI*4)(%eax), %edi
movl (JB_BP*4)(%eax), %ebp
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cfi_restore(%ebx)
cfi_restore(%esi)
cfi_restore(%edi)
cfi_restore(%ebp)
movl 8(%esp), %eax /* Second argument is return value. */
movl %ecx, %esp
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/* Jump to saved PC. */
jmp *%edx
END (____longjmp_chk)