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dd38f49cdc
There is no need to use TESTL when checking the least-significant bit with a TEST instruction. Use TESTB, which is three bytes shorter: f6 44 24 f0 01 testb $0x1,-0x10(%rsp) vs: f7 44 24 f0 01 00 00 testl $0x1,-0x10(%rsp) 00 for the same effect. No functional changes intended. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Cc: H.J.Lu <hjl.tools@gmail.com> Cc: Carlos O'Donell <carlos@redhat.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
71 lines
2.2 KiB
ArmAsm
71 lines
2.2 KiB
ArmAsm
/* Copyright (C) 2001-2025 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 <sigaltstack-offsets.h>
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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 LOAD_MSG lea longjmp_msg(%rip), %RDI_LP
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#else
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# define LOAD_MSG mov $longjmp_msg, %RDI_LP
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#endif
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#define CHECK_INVALID_LONGJMP \
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cmp %R8_LP, %RSP_LP; \
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jbe .Lok; \
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/* Save function parameters. */ \
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movq %rdi, %r10; \
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cfi_register (%rdi, %r10); \
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movl %esi, %ebx; \
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cfi_register (%rsi, %rbx); \
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xorl %edi, %edi; \
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lea -sizeSS(%rsp), %RSI_LP; \
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movl $__NR_sigaltstack, %eax; \
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syscall; \
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/* Without working sigaltstack we cannot perform the test. */ \
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testl %eax, %eax; \
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jne .Lok2; \
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testb $1, (-sizeSS + oSS_FLAGS)(%rsp); \
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jz .Lfail; \
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mov (-sizeSS + oSS_SP)(%rsp), %RAX_LP; \
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add (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP; \
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sub %R8_LP, %RAX_LP; \
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cmp (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP; \
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jae .Lok2; \
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.Lfail: \
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sub $8, %RSP_LP; \
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cfi_remember_state; \
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cfi_def_cfa_offset(16); \
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LOAD_MSG; \
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call HIDDEN_JUMPTARGET(__fortify_fail); \
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cfi_restore_state; \
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.p2align 3, 5; \
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.Lok2: \
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movq %r10, %rdi; \
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cfi_restore (%rdi); \
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movl %ebx, %esi; \
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cfi_restore (%rsi); \
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.Lok:
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#define __longjmp ____longjmp_chk
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#include <__longjmp.S>
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