165 lines
4.8 KiB
C
165 lines
4.8 KiB
C
/* Assembler macros for x86-64.
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Copyright (C) 2001-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _X86_64_SYSDEP_H
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#define _X86_64_SYSDEP_H 1
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#include <sysdeps/generic/sysdep.h>
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
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/* This macro is for setting proper CFI with DW_CFA_expression describing
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the register as saved relative to %rsp instead of relative to the CFA.
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Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset
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from %rsp. */
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#define cfi_offset_rel_rsp(regn, off) .cfi_escape 0x10, regn, 0x4, 0x13, \
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0x77, off & 0x7F | 0x80, off >> 7
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/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
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#define ALIGNARG(log2) 1<<log2
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
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/* Define an entry point visible from C. */
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#define ENTRY(name) \
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.globl C_SYMBOL_NAME(name); \
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.type C_SYMBOL_NAME(name),@function; \
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.align ALIGNARG(4); \
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C_LABEL(name) \
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cfi_startproc; \
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CALL_MCOUNT
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#undef END
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#define END(name) \
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cfi_endproc; \
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ASM_SIZE_DIRECTIVE(name)
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#define ENTRY_CHK(name) ENTRY (name)
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#define END_CHK(name) END (name)
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/* If compiled for profiling, call `mcount' at the start of each function. */
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#ifdef PROF
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/* The mcount code relies on a normal frame pointer being on the stack
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to locate our caller, so push one just for its benefit. */
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#define CALL_MCOUNT \
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pushq %rbp; \
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cfi_adjust_cfa_offset(8); \
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movq %rsp, %rbp; \
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cfi_def_cfa_register(%rbp); \
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call JUMPTARGET(mcount); \
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popq %rbp; \
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cfi_def_cfa(rsp,8);
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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/* Since C identifiers are not normally prefixed with an underscore
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on this system, the asm identifier `syscall_error' intrudes on the
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C name space. Make sure we use an innocuous name. */
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#define syscall_error __syscall_error
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#define mcount _mcount
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#define PSEUDO(name, syscall_name, args) \
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lose: \
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jmp JUMPTARGET(syscall_error) \
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.globl syscall_error; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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jb lose
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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#undef JUMPTARGET
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#ifdef PIC
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#define JUMPTARGET(name) name##@PLT
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#else
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#define JUMPTARGET(name) name
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#endif
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/* Local label name for asm code. */
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#ifndef L
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/* ELF-like local names start with `.L'. */
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# define L(name) .L##name
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#endif
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#define atom_text_section .section ".text.atom", "ax"
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/* Long and pointer size in bytes. */
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#define LP_SIZE 8
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/* Instruction to operate on long and pointer. */
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#define LP_OP(insn) insn##q
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/* Assembler address directive. */
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#define ASM_ADDR .quad
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/* Registers to hold long and pointer. */
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#define RAX_LP rax
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#define RBP_LP rbp
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#define RBX_LP rbx
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#define RCX_LP rcx
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#define RDI_LP rdi
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#define RDX_LP rdx
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#define RSI_LP rsi
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#define RSP_LP rsp
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#define R8_LP r8
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#define R9_LP r9
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#define R10_LP r10
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#define R11_LP r11
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#define R12_LP r12
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#define R13_LP r13
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#define R14_LP r14
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#define R15_LP r15
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#else /* __ASSEMBLER__ */
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/* Long and pointer size in bytes. */
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#define LP_SIZE "8"
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/* Instruction to operate on long and pointer. */
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#define LP_OP(insn) #insn "q"
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/* Assembler address directive. */
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#define ASM_ADDR ".quad"
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/* Registers to hold long and pointer. */
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#define RAX_LP "rax"
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#define RBP_LP "rbp"
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#define RBX_LP "rbx"
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#define RCX_LP "rcx"
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#define RDI_LP "rdi"
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#define RDX_LP "rdx"
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#define RSI_LP "rsi"
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#define RSP_LP "rsp"
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#define R8_LP "r8"
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#define R9_LP "r9"
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#define R10_LP "r10"
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#define R11_LP "r11"
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#define R12_LP "r12"
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#define R13_LP "r13"
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#define R14_LP "r14"
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#define R15_LP "r15"
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#endif /* __ASSEMBLER__ */
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#endif /* _X86_64_SYSDEP_H */
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