1 /* Assembler macros for x86-64.
2 Copyright (C) 2001-2022 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 <https://www.gnu.org/licenses/>. */
19 #ifndef _X86_64_SYSDEP_H
20 #define _X86_64_SYSDEP_H 1
22 #include <sysdeps/x86/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 /* If compiled for profiling, call `mcount' at the start of each function. */
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. */
41 cfi_adjust_cfa_offset(8); \
43 cfi_def_cfa_register(%rbp); \
44 call JUMPTARGET(mcount); \
48 #define CALL_MCOUNT /* Do nothing. */
51 #define PSEUDO(name, syscall_name, args) \
53 jmp JUMPTARGET(syscall_error) \
54 .globl syscall_error; \
56 DO_CALL (syscall_name, args); \
62 # define JUMPTARGET(name) *name##@GOTPCREL(%rip)
64 # define JUMPTARGET(name) name##@PLT
67 /* For static archives, branch to target directly. */
68 # define JUMPTARGET(name) name
71 /* Long and pointer size in bytes. */
74 /* Instruction to operate on long and pointer. */
75 #define LP_OP(insn) insn##q
77 /* Assembler address directive. */
78 #define ASM_ADDR .quad
80 /* Registers to hold long and pointer. */
98 /* Zero upper vector registers and return with xtest. NB: Use VZEROALL
99 to avoid RTM abort triggered by VZEROUPPER inside transactionally. */
100 #define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \
109 /* Zero upper vector registers and return. */
110 #ifndef ZERO_UPPER_VEC_REGISTERS_RETURN
111 # define ZERO_UPPER_VEC_REGISTERS_RETURN \
116 #ifndef VZEROUPPER_RETURN
117 # define VZEROUPPER_RETURN VZEROUPPER; ret
120 #else /* __ASSEMBLER__ */
122 /* Long and pointer size in bytes. */
125 /* Instruction to operate on long and pointer. */
126 #define LP_OP(insn) #insn "q"
128 /* Assembler address directive. */
129 #define ASM_ADDR ".quad"
131 /* Registers to hold long and pointer. */
149 #endif /* __ASSEMBLER__ */
151 #endif /* _X86_64_SYSDEP_H */