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25f1e16ef0
CET is only support for x86_64, this patch reverts: -faaee1f07ex86: Support shadow stack pointer in setjmp/longjmp. -be9ccd27c0i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S -c02695d776x86/CET: Update vfork to prevent child return -5d844e1b72i386: Enable CET support in ucontext functions -124bcde683x86: Add _CET_ENDBR to functions in crti.S -562837c002x86: Add _CET_ENDBR to functions in dl-tlsdesc.S -f753fa7deax86: Support IBT and SHSTK in Intel CET [BZ #21598] -825b58f3fbi386-mcount.S: Add _CET_ENDBR to _mcount and __fentry__ -7e119cd582i386: Use _CET_NOTRACK in i686/memcmp.S -177824e232i386: Use _CET_NOTRACK in memcmp-sse4.S -0a899af097i386: Use _CET_NOTRACK in memcpy-ssse3-rep.S -7fb613361ci386: Use _CET_NOTRACK in memcpy-ssse3.S -77a8ae0948i386: Use _CET_NOTRACK in memset-sse2-rep.S -00e7b76a8fi386: Use _CET_NOTRACK in memset-sse2.S -90d15dc577i386: Use _CET_NOTRACK in strcat-sse2.S -f1574581c7i386: Use _CET_NOTRACK in strcpy-sse2.S -4031d7484ai386/sub_n.S: Add a missing _CET_ENDBR to indirect jump - target - Checked on i686-linux-gnu.
207 lines
5.7 KiB
C
207 lines
5.7 KiB
C
/* Assembler macros for x86-64.
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Copyright (C) 2001-2024 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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#ifndef _X86_64_SYSDEP_H
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#define _X86_64_SYSDEP_H 1
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#include <sysdeps/x86/sysdep.h>
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#include <x86-lp_size.h>
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/* __CET__ is defined by GCC with Control-Flow Protection values:
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enum cf_protection_level
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{
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CF_NONE = 0,
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CF_BRANCH = 1 << 0,
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CF_RETURN = 1 << 1,
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CF_FULL = CF_BRANCH | CF_RETURN,
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CF_SET = 1 << 2
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};
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*/
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/* Set if CF_BRANCH (IBT) is enabled. */
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#define X86_FEATURE_1_IBT (1U << 0)
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/* Set if CF_RETURN (SHSTK) is enabled. */
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#define X86_FEATURE_1_SHSTK (1U << 1)
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#ifdef __CET__
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# define CET_ENABLED 1
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# define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK)
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#else
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# define CET_ENABLED 0
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# define SHSTK_ENABLED 0
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#endif
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
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#ifdef _CET_ENDBR
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# define _CET_NOTRACK notrack
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#else
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# define _CET_ENDBR
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# define _CET_NOTRACK
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#endif
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/* Define an entry point visible from C. */
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#define ENTRY_P2ALIGN(name, alignment) \
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.globl C_SYMBOL_NAME(name); \
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.type C_SYMBOL_NAME(name),@function; \
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.align ALIGNARG(alignment); \
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C_LABEL(name) \
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cfi_startproc; \
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_CET_ENDBR; \
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CALL_MCOUNT
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/* This macro is for setting proper CFI with DW_CFA_expression describing
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the register as saved relative to %rsp instead of relative to the CFA.
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Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset
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from %rsp. */
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#define cfi_offset_rel_rsp(regn, off) .cfi_escape 0x10, regn, 0x4, 0x13, \
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0x77, off & 0x7F | 0x80, off >> 7
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/* If compiled for profiling, call `mcount' at the start of each function. */
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#ifdef PROF
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/* The mcount code relies on a normal frame pointer being on the stack
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to locate our caller, so push one just for its benefit. */
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#define CALL_MCOUNT \
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pushq %rbp; \
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cfi_adjust_cfa_offset(8); \
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movq %rsp, %rbp; \
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cfi_def_cfa_register(%rbp); \
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call JUMPTARGET(mcount); \
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popq %rbp; \
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cfi_def_cfa(rsp,8);
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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#define PSEUDO(name, syscall_name, args) \
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lose: \
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jmp JUMPTARGET(syscall_error) \
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.globl syscall_error; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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jb lose
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#undef JUMPTARGET
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#ifdef SHARED
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# ifdef BIND_NOW
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# define JUMPTARGET(name) *name##@GOTPCREL(%rip)
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# else
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# define JUMPTARGET(name) name##@PLT
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# endif
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#else
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/* For static archives, branch to target directly. */
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# define JUMPTARGET(name) name
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#endif
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/* Instruction to operate on long and pointer. */
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#define LP_OP(insn) insn##q
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/* Assembler address directive. */
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#define ASM_ADDR .quad
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/* Registers to hold long and pointer. */
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#define RAX_LP rax
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#define RBP_LP rbp
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#define RBX_LP rbx
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#define RCX_LP rcx
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#define RDI_LP rdi
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#define RDX_LP rdx
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#define RSI_LP rsi
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#define RSP_LP rsp
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#define R8_LP r8
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#define R9_LP r9
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#define R10_LP r10
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#define R11_LP r11
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#define R12_LP r12
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#define R13_LP r13
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#define R14_LP r14
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#define R15_LP r15
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/* Zero upper vector registers and return with xtest. NB: Use VZEROALL
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to avoid RTM abort triggered by VZEROUPPER inside transactionally. */
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#define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \
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xtest; \
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jnz 1f; \
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vzeroupper; \
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ret; \
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1: \
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vzeroall; \
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ret
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/* Can be used to replace vzeroupper that is not directly before a
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return. This is useful when hoisting a vzeroupper from multiple
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return paths to decrease the total number of vzerouppers and code
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size. */
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#define COND_VZEROUPPER_XTEST \
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xtest; \
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jz 1f; \
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vzeroall; \
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jmp 2f; \
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1: \
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vzeroupper; \
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2:
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/* In RTM define this as COND_VZEROUPPER_XTEST. */
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#ifndef COND_VZEROUPPER
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# define COND_VZEROUPPER vzeroupper
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#endif
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/* Zero upper vector registers and return. */
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#ifndef ZERO_UPPER_VEC_REGISTERS_RETURN
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# define ZERO_UPPER_VEC_REGISTERS_RETURN \
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VZEROUPPER; \
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ret
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#endif
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#ifndef VZEROUPPER_RETURN
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# define VZEROUPPER_RETURN VZEROUPPER; ret
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#endif
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#else /* __ASSEMBLER__ */
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/* Instruction to operate on long and pointer. */
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#define LP_OP(insn) #insn "q"
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/* Assembler address directive. */
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#define ASM_ADDR ".quad"
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/* Registers to hold long and pointer. */
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#define RAX_LP "rax"
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#define RBP_LP "rbp"
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#define RBX_LP "rbx"
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#define RCX_LP "rcx"
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#define RDI_LP "rdi"
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#define RDX_LP "rdx"
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#define RSI_LP "rsi"
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#define RSP_LP "rsp"
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#define R8_LP "r8"
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#define R9_LP "r9"
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#define R10_LP "r10"
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#define R11_LP "r11"
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#define R12_LP "r12"
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#define R13_LP "r13"
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#define R14_LP "r14"
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#define R15_LP "r15"
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#endif /* __ASSEMBLER__ */
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#endif /* _X86_64_SYSDEP_H */
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