mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
ca98e1710e
Pretty sure we require recent enough versions of gcc/binutils to make this check pointless. I can't any logs in the last few years where this check didn't return "yes". Signed-off-by: Mike Frysinger <vapier@gentoo.org>
169 lines
5.3 KiB
C
169 lines
5.3 KiB
C
/* Assembler macros for i386.
|
|
Copyright (C) 1991-93,95,96,98,2002,2003,2005,2006,2011,2012
|
|
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/generic/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__
|
|
# if __GNUC_PREREQ (4, 7)
|
|
# define GET_PC_THUNK(reg) __x86.get_pc_thunk.reg
|
|
# else
|
|
# define GET_PC_THUNK(reg) __i686.get_pc_thunk.reg
|
|
# endif
|
|
#else
|
|
# if __GNUC_PREREQ (4, 7)
|
|
# define GET_PC_THUNK_STR(reg) "__x86.get_pc_thunk." #reg
|
|
# else
|
|
# define GET_PC_THUNK_STR(reg) "__i686.get_pc_thunk." #reg
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
/* Syntactic details of assembler. */
|
|
|
|
/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
|
|
#define ALIGNARG(log2) 1<<log2
|
|
#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
|
|
|
|
|
|
/* Define an entry point visible from C.
|
|
|
|
There is currently a bug in gdb which prevents us from specifying
|
|
incomplete stabs information. Fake some entries here which specify
|
|
the current source file. */
|
|
#define ENTRY(name) \
|
|
.globl C_SYMBOL_NAME(name); \
|
|
.type C_SYMBOL_NAME(name),@function; \
|
|
.align ALIGNARG(4); \
|
|
C_LABEL(name) \
|
|
cfi_startproc; \
|
|
CALL_MCOUNT
|
|
|
|
#undef END
|
|
#define END(name) \
|
|
cfi_endproc; \
|
|
ASM_SIZE_DIRECTIVE(name)
|
|
|
|
#define ENTRY_CHK(name) ENTRY (name)
|
|
#define END_CHK(name) END (name)
|
|
|
|
/* 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
|
|
|
|
/* Since C identifiers are not normally prefixed with an underscore
|
|
on this system, the asm identifier `syscall_error' intrudes on the
|
|
C name space. Make sure we use an innocuous name. */
|
|
#define syscall_error __syscall_error
|
|
#define mcount _mcount
|
|
|
|
#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
|
|
|
|
#undef PSEUDO_END
|
|
#define PSEUDO_END(name) \
|
|
END (name)
|
|
|
|
# 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
|
|
|
|
/* Local label name for asm code. */
|
|
#ifndef L
|
|
#define L(name) .L##name
|
|
#endif
|
|
|
|
#define atom_text_section .section ".text.atom", "ax"
|
|
|
|
#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__ */
|