1/* Assembler macros for x86-64.
2 Copyright (C) 2001-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
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.
9
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.
14
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 <https://www.gnu.org/licenses/>. */
18
19#ifndef _X86_64_SYSDEP_H
20#define _X86_64_SYSDEP_H 1
21
22#include <sysdeps/x86/sysdep.h>
23
24#ifdef __ASSEMBLER__
25
26/* Syntactic details of assembler. */
27
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
31 from %rsp. */
32#define cfi_offset_rel_rsp(regn, off) .cfi_escape 0x10, regn, 0x4, 0x13, \
33 0x77, off & 0x7F | 0x80, off >> 7
34
35/* If compiled for profiling, call `mcount' at the start of each function. */
36#ifdef PROF
37/* The mcount code relies on a normal frame pointer being on the stack
38 to locate our caller, so push one just for its benefit. */
39#define CALL_MCOUNT \
40 pushq %rbp; \
41 cfi_adjust_cfa_offset(8); \
42 movq %rsp, %rbp; \
43 cfi_def_cfa_register(%rbp); \
44 call JUMPTARGET(mcount); \
45 popq %rbp; \
46 cfi_def_cfa(rsp,8);
47#else
48#define CALL_MCOUNT /* Do nothing. */
49#endif
50
51#define PSEUDO(name, syscall_name, args) \
52lose: \
53 jmp JUMPTARGET(syscall_error) \
54 .globl syscall_error; \
55 ENTRY (name) \
56 DO_CALL (syscall_name, args); \
57 jb lose
58
59#undef JUMPTARGET
60#ifdef SHARED
61# ifdef BIND_NOW
62# define JUMPTARGET(name) *name##@GOTPCREL(%rip)
63# else
64# define JUMPTARGET(name) name##@PLT
65# endif
66#else
67/* For static archives, branch to target directly. */
68# define JUMPTARGET(name) name
69#endif
70
71/* Long and pointer size in bytes. */
72#define LP_SIZE 8
73
74/* Instruction to operate on long and pointer. */
75#define LP_OP(insn) insn##q
76
77/* Assembler address directive. */
78#define ASM_ADDR .quad
79
80/* Registers to hold long and pointer. */
81#define RAX_LP rax
82#define RBP_LP rbp
83#define RBX_LP rbx
84#define RCX_LP rcx
85#define RDI_LP rdi
86#define RDX_LP rdx
87#define RSI_LP rsi
88#define RSP_LP rsp
89#define R8_LP r8
90#define R9_LP r9
91#define R10_LP r10
92#define R11_LP r11
93#define R12_LP r12
94#define R13_LP r13
95#define R14_LP r14
96#define R15_LP r15
97
98#else /* __ASSEMBLER__ */
99
100/* Long and pointer size in bytes. */
101#define LP_SIZE "8"
102
103/* Instruction to operate on long and pointer. */
104#define LP_OP(insn) #insn "q"
105
106/* Assembler address directive. */
107#define ASM_ADDR ".quad"
108
109/* Registers to hold long and pointer. */
110#define RAX_LP "rax"
111#define RBP_LP "rbp"
112#define RBX_LP "rbx"
113#define RCX_LP "rcx"
114#define RDI_LP "rdi"
115#define RDX_LP "rdx"
116#define RSI_LP "rsi"
117#define RSP_LP "rsp"
118#define R8_LP "r8"
119#define R9_LP "r9"
120#define R10_LP "r10"
121#define R11_LP "r11"
122#define R12_LP "r12"
123#define R13_LP "r13"
124#define R14_LP "r14"
125#define R15_LP "r15"
126
127#endif /* __ASSEMBLER__ */
128
129#endif /* _X86_64_SYSDEP_H */
130