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88f4b6929c
This allows us to define a generic no-op version of PTR_MANGLE and PTR_DEMANGLE. In the future, we can use PTR_MANGLE and PTR_DEMANGLE unconditionally in C sources, avoiding an unintended loss of hardening due to missing include files or unlucky header inclusion ordering. In i386 and x86_64, we can avoid a <tls.h> dependency in the C code by using the computed constant from <tcb-offsets.h>. <sysdep.h> no longer includes these definitions, so there is no cyclic dependency anymore when computing the <tcb-offsets.h> constants. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
89 lines
2.7 KiB
ArmAsm
89 lines
2.7 KiB
ArmAsm
/* setjmp for x86-64.
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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.
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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 <pointer_guard.h>
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#include <jmpbuf-offsets.h>
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#include <jmp_buf-ssp.h>
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#include <asm-syntax.h>
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#include <stap-probe.h>
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/* Don't save shadow stack register if shadow stack isn't enabled. */
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#if !SHSTK_ENABLED
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# undef SHADOW_STACK_POINTER_OFFSET
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#endif
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ENTRY (__sigsetjmp)
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/* Save registers. */
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movq %rbx, (JB_RBX*8)(%rdi)
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#ifdef PTR_MANGLE
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# ifdef __ILP32__
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/* Save the high bits of %rbp first, since PTR_MANGLE will
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only handle the low bits but we cannot presume %rbp is
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being used as a pointer and truncate it. Here we write all
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of %rbp, but the low bits will be overwritten below. */
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movq %rbp, (JB_RBP*8)(%rdi)
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# endif
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mov %RBP_LP, %RAX_LP
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PTR_MANGLE (%RAX_LP)
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mov %RAX_LP, (JB_RBP*8)(%rdi)
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#else
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movq %rbp, (JB_RBP*8)(%rdi)
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#endif
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movq %r12, (JB_R12*8)(%rdi)
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movq %r13, (JB_R13*8)(%rdi)
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movq %r14, (JB_R14*8)(%rdi)
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movq %r15, (JB_R15*8)(%rdi)
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lea 8(%rsp), %RDX_LP /* Save SP as it will be after we return. */
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#ifdef PTR_MANGLE
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PTR_MANGLE (%RDX_LP)
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#endif
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movq %rdx, (JB_RSP*8)(%rdi)
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mov (%rsp), %RAX_LP /* Save PC we are returning to now. */
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LIBC_PROBE (setjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RAX_LP)
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#ifdef PTR_MANGLE
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PTR_MANGLE (%RAX_LP)
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#endif
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movq %rax, (JB_PC*8)(%rdi)
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#ifdef SHADOW_STACK_POINTER_OFFSET
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# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
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/* Check if Shadow Stack is enabled. */
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testl $X86_FEATURE_1_SHSTK, %fs:FEATURE_1_OFFSET
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jz L(skip_ssp)
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# else
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xorl %eax, %eax
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# endif
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/* Get the current Shadow-Stack-Pointer and save it. */
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rdsspq %rax
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movq %rax, SHADOW_STACK_POINTER_OFFSET(%rdi)
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# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
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L(skip_ssp):
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# endif
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#endif
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#if IS_IN (rtld)
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/* In ld.so we never save the signal mask. */
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xorl %eax, %eax
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retq
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#else
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/* Make a tail call to __sigjmp_save; it takes the same args. */
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jmp __sigjmp_save
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#endif
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END (__sigsetjmp)
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hidden_def (__sigsetjmp)
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