mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/* Assembler macros for i386.
|
|
Copyright (C) 1991-2018 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdeps/x86/sysdep.h>
|
|
|
|
#include <features.h> /* For __GNUC_PREREQ. */
|
|
|
|
/* 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. */
|
|
|
|
/* 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 .gnu.linkonce.t.GET_PC_THUNK(reg),"ax",@progbits; \
|
|
.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 .gnu.linkonce.t." GET_PC_THUNK_STR (reg) ",\"ax\",@progbits\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__ */
|