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/* Assembler macros for x86-64.
Copyright (C) 2001-2016 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/>. */
#ifndef _X86_64_SYSDEP_H
#define _X86_64_SYSDEP_H 1
#include <sysdeps/generic/sysdep.h>
#ifdef __ASSEMBLER__
/* Syntactic details of assembler. */
/* This macro is for setting proper CFI with DW_CFA_expression describing
the register as saved relative to %rsp instead of relative to the CFA.
Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset
from %rsp. */
#define cfi_offset_rel_rsp(regn, off) .cfi_escape 0x10, regn, 0x4, 0x13, \
0x77, off & 0x7F | 0x80, off >> 7
/* 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. */
#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 \
pushq %rbp; \
cfi_adjust_cfa_offset(8); \
movq %rsp, %rbp; \
cfi_def_cfa_register(%rbp); \
call JUMPTARGET(mcount); \
popq %rbp; \
cfi_def_cfa(rsp,8);
#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) \
lose: \
jmp JUMPTARGET(syscall_error) \
.globl syscall_error; \
ENTRY (name) \
DO_CALL (syscall_name, args); \
jb lose
#undef PSEUDO_END
#define PSEUDO_END(name) \
END (name)
#undef JUMPTARGET
#ifdef PIC
#define JUMPTARGET(name) name##@PLT
#else
#define JUMPTARGET(name) name
#endif
/* Local label name for asm code. */
#ifndef L
/* ELF-like local names start with `.L'. */
# define L(name) .L##name
#endif
#define atom_text_section .section ".text.atom", "ax"
/* Long and pointer size in bytes. */
#define LP_SIZE 8
/* Instruction to operate on long and pointer. */
#define LP_OP(insn) insn##q
/* Assembler address directive. */
#define ASM_ADDR .quad
/* Registers to hold long and pointer. */
#define RAX_LP rax
#define RBP_LP rbp
#define RBX_LP rbx
#define RCX_LP rcx
#define RDI_LP rdi
#define RDX_LP rdx
#define RSI_LP rsi
#define RSP_LP rsp
#define R8_LP r8
#define R9_LP r9
#define R10_LP r10
#define R11_LP r11
#define R12_LP r12
#define R13_LP r13
#define R14_LP r14
#define R15_LP r15
#else /* __ASSEMBLER__ */
/* Long and pointer size in bytes. */
#define LP_SIZE "8"
/* Instruction to operate on long and pointer. */
#define LP_OP(insn) #insn "q"
/* Assembler address directive. */
#define ASM_ADDR ".quad"
/* Registers to hold long and pointer. */
#define RAX_LP "rax"
#define RBP_LP "rbp"
#define RBX_LP "rbx"
#define RCX_LP "rcx"
#define RDI_LP "rdi"
#define RDX_LP "rdx"
#define RSI_LP "rsi"
#define RSP_LP "rsp"
#define R8_LP "r8"
#define R9_LP "r9"
#define R10_LP "r10"
#define R11_LP "r11"
#define R12_LP "r12"
#define R13_LP "r13"
#define R14_LP "r14"
#define R15_LP "r15"
#endif /* __ASSEMBLER__ */
#endif /* _X86_64_SYSDEP_H */
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