mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
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.
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/* Assembler macros for i386.
|
|
Copyright (C) 1991-2024 Free Software Foundation, Inc.
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdeps/x86/sysdep.h>
|
|
|
|
#define CET_ENABLED 0
|
|
|
|
/* It is desirable that the names of PIC thunks match those used by
|
|
GCC so that multiple copies are eliminated by the linker. Because
|
|
GCC 4.6 and earlier use __i686 in the names, it is necessary to
|
|
override that predefined macro. */
|
|
#if defined __i686 && defined __ASSEMBLER__
|
|
#undef __i686
|
|
#define __i686 __i686
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLER__
|
|
# define GET_PC_THUNK(reg) __x86.get_pc_thunk.reg
|
|
#else
|
|
# define GET_PC_THUNK_STR(reg) "__x86.get_pc_thunk." #reg
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
/* Syntactic details of assembler. */
|
|
|
|
/* Define an entry point visible from C. */
|
|
#define ENTRY_P2ALIGN(name, alignment) \
|
|
.globl C_SYMBOL_NAME(name); \
|
|
.type C_SYMBOL_NAME(name),@function; \
|
|
.align ALIGNARG(alignment); \
|
|
C_LABEL(name) \
|
|
cfi_startproc; \
|
|
CALL_MCOUNT
|
|
|
|
/* If compiled for profiling, call `mcount' at the start of each function. */
|
|
#ifdef PROF
|
|
/* The mcount code relies on a normal frame pointer being on the stack
|
|
to locate our caller, so push one just for its benefit. */
|
|
#define CALL_MCOUNT \
|
|
pushl %ebp; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \
|
|
cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \
|
|
popl %ebp; cfi_def_cfa (esp, 4);
|
|
#else
|
|
#define CALL_MCOUNT /* Do nothing. */
|
|
#endif
|
|
|
|
#define PSEUDO(name, syscall_name, args) \
|
|
.globl syscall_error; \
|
|
lose: SYSCALL_PIC_SETUP \
|
|
jmp JUMPTARGET(syscall_error); \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args); \
|
|
jb lose
|
|
|
|
# define SETUP_PIC_REG(reg) \
|
|
.ifndef GET_PC_THUNK(reg); \
|
|
.section .text.GET_PC_THUNK(reg),"axG",@progbits,GET_PC_THUNK(reg),comdat; \
|
|
.globl GET_PC_THUNK(reg); \
|
|
.hidden GET_PC_THUNK(reg); \
|
|
.p2align 4; \
|
|
.type GET_PC_THUNK(reg),@function; \
|
|
GET_PC_THUNK(reg): \
|
|
movl (%esp), %e##reg; \
|
|
ret; \
|
|
.size GET_PC_THUNK(reg), . - GET_PC_THUNK(reg); \
|
|
.previous; \
|
|
.endif; \
|
|
call GET_PC_THUNK(reg)
|
|
|
|
# define LOAD_PIC_REG(reg) \
|
|
SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg
|
|
|
|
#undef JUMPTARGET
|
|
#ifdef PIC
|
|
#define JUMPTARGET(name) name##@PLT
|
|
#define SYSCALL_PIC_SETUP \
|
|
pushl %ebx; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
call 0f; \
|
|
0: popl %ebx; \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ebx;
|
|
|
|
#else
|
|
#define JUMPTARGET(name) name
|
|
#define SYSCALL_PIC_SETUP /* Nothing. */
|
|
#endif
|
|
|
|
#else /* __ASSEMBLER__ */
|
|
|
|
# define SETUP_PIC_REG_STR(reg) \
|
|
".ifndef " GET_PC_THUNK_STR (reg) "\n" \
|
|
".section .text." GET_PC_THUNK_STR (reg) ",\"axG\",@progbits," \
|
|
GET_PC_THUNK_STR (reg) ",comdat\n" \
|
|
".globl " GET_PC_THUNK_STR (reg) "\n" \
|
|
".hidden " GET_PC_THUNK_STR (reg) "\n" \
|
|
".p2align 4\n" \
|
|
".type " GET_PC_THUNK_STR (reg) ",@function\n" \
|
|
GET_PC_THUNK_STR (reg) ":" \
|
|
"movl (%%esp), %%e" #reg "\n" \
|
|
"ret\n" \
|
|
".size " GET_PC_THUNK_STR (reg) ", . - " GET_PC_THUNK_STR (reg) "\n" \
|
|
".previous\n" \
|
|
".endif\n" \
|
|
"call " GET_PC_THUNK_STR (reg)
|
|
|
|
# define LOAD_PIC_REG_STR(reg) \
|
|
SETUP_PIC_REG_STR (reg) "\naddl $_GLOBAL_OFFSET_TABLE_, %%e" #reg
|
|
|
|
#endif /* __ASSEMBLER__ */
|