1 /* Assembler macros for x86-64.
2 Copyright (C) 2001-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _X86_64_SYSDEP_H
20 #define _X86_64_SYSDEP_H 1
22 #include <sysdeps/generic/sysdep.h>
26 /* Syntactic details of assembler. */
28 /* This macro is for setting proper CFI with DW_CFA_expression describing
29 the register as saved relative to %rsp instead of relative to the CFA.
30 Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset
32 #define cfi_offset_rel_rsp(regn, off) .cfi_escape 0x10, regn, 0x4, 0x13, \
33 0x77, off & 0x7F | 0x80, off >> 7
35 /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
36 #define ALIGNARG(log2) 1<<log2
37 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
40 /* Define an entry point visible from C. */
42 .globl C_SYMBOL_NAME(name); \
43 .type C_SYMBOL_NAME(name),@function; \
52 ASM_SIZE_DIRECTIVE(name)
54 #define ENTRY_CHK(name) ENTRY (name)
55 #define END_CHK(name) END (name)
57 /* If compiled for profiling, call `mcount' at the start of each function. */
59 /* The mcount code relies on a normal frame pointer being on the stack
60 to locate our caller, so push one just for its benefit. */
63 cfi_adjust_cfa_offset(8); \
65 cfi_def_cfa_register(%rbp); \
66 call JUMPTARGET(mcount); \
70 #define CALL_MCOUNT /* Do nothing. */
73 /* Since C identifiers are not normally prefixed with an underscore
74 on this system, the asm identifier `syscall_error' intrudes on the
75 C name space. Make sure we use an innocuous name. */
76 #define syscall_error __syscall_error
77 #define mcount _mcount
79 #define PSEUDO(name, syscall_name, args) \
81 jmp JUMPTARGET(syscall_error) \
82 .globl syscall_error; \
84 DO_CALL (syscall_name, args); \
88 #define PSEUDO_END(name) \
94 # define JUMPTARGET(name) *name##@GOTPCREL(%rip)
96 # define JUMPTARGET(name) name##@PLT
99 /* For static archives, branch to target directly. */
100 # define JUMPTARGET(name) name
103 /* Local label name for asm code. */
105 /* ELF-like local names start with `.L'. */
106 # define L(name) .L##name
109 #define atom_text_section .section ".text.atom", "ax"
111 /* Long and pointer size in bytes. */
114 /* Instruction to operate on long and pointer. */
115 #define LP_OP(insn) insn##q
117 /* Assembler address directive. */
118 #define ASM_ADDR .quad
120 /* Registers to hold long and pointer. */
138 #else /* __ASSEMBLER__ */
140 /* Long and pointer size in bytes. */
143 /* Instruction to operate on long and pointer. */
144 #define LP_OP(insn) #insn "q"
146 /* Assembler address directive. */
147 #define ASM_ADDR ".quad"
149 /* Registers to hold long and pointer. */
167 #endif /* __ASSEMBLER__ */
169 #endif /* _X86_64_SYSDEP_H */