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581c785bf3
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 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
125 lines
3.6 KiB
ArmAsm
125 lines
3.6 KiB
ArmAsm
/* Copyright (C) 2001-2022 Free Software Foundation, Inc.
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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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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <tcb-offsets.h>
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#include <asm-syntax.h>
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#include <signal-defines.h>
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/* #include <signal.h> */
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#define SS_ONSTACK 1
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.section .rodata.str1.1,"aMS",@progbits,1
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.type longjmp_msg,@object
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longjmp_msg:
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.string "longjmp causes uninitialized stack frame"
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.size longjmp_msg, .-longjmp_msg
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#ifdef PIC
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# define CALL_FAIL movl %ebx, %ecx; /* TODO: what's this mov good for? */ \
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cfi_register(%ebx,%ecx); \
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LOAD_PIC_REG (bx); \
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leal longjmp_msg@GOTOFF(%ebx), %eax; \
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movl %eax, (%esp); \
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call HIDDEN_JUMPTARGET(__fortify_fail)
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#else
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# define CALL_FAIL movl $longjmp_msg, %eax; \
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movl %eax, (%esp); \
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call HIDDEN_JUMPTARGET(__fortify_fail)
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#endif
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.text
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ENTRY (____longjmp_chk)
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movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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/* Save the return address now. */
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movl (JB_PC*4)(%eax), %edx
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/* Get the stack pointer. */
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movl (JB_SP*4)(%eax), %ecx
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cfi_undefined(%ecx)
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (%edx)
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PTR_DEMANGLE (%ecx)
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#endif
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movw %ds, %si
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movw %gs, %di
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cmpw %si, %di
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jz .Lok /* TLS not initialized yet */
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movl %gs:SIGSTATE_OFFSET, %edi
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testl %edi, %edi
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jz .Lok /* sigstate not initialized yet */
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testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
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jnz .Lonstack
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/* We were on the main stack */
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cmpl %ecx, %esp
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/* Jumping to a higher-address frame is always allowed. */
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jbe .Lok
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/* Otherwise it's not allowed. */
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CALL_FAIL
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.Lonstack:
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/* We were on the alternate stack, can't really easily check anything
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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
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jb .Loks /* We jump below the alternate stack, switch. */
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movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ebx
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addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%edi), %ebx
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cmpl %ebx, %ecx
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jb .Lok /* We jump inside the alternate stack, do not switch. */
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/* We jump above the alternate stack, switch. */
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.Loks: /* We jump out of the alternate stack, clear SS_ONSTACK flag. */
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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. */
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cfi_def_cfa(%eax, 0)
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cfi_register(%eip, %edx)
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cfi_register(%esp, %ecx)
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cfi_offset(%ebx, JB_BX*4)
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cfi_offset(%esi, JB_SI*4)
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cfi_offset(%edi, JB_DI*4)
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cfi_offset(%ebp, JB_BP*4)
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/* Restore registers. */
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movl (JB_BX*4)(%eax), %ebx
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movl (JB_SI*4)(%eax), %esi
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movl (JB_DI*4)(%eax), %edi
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movl (JB_BP*4)(%eax), %ebp
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cfi_restore(%ebx)
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cfi_restore(%esi)
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cfi_restore(%edi)
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cfi_restore(%ebp)
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movl 8(%esp), %eax /* Second argument is return value. */
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movl %ecx, %esp
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/* Jump to saved PC. */
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jmp *%edx
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END (____longjmp_chk)
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