1/* Assembler macros for x86-64.
2   Copyright (C) 2001, 2002, 2003 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, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20#include_next <sysdep.h>
21
22#ifdef	__ASSEMBLER__
23
24#ifdef HAVE_ELF
25
26/* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
27#define ALIGNARG(log2) 1<<log2
28/* For ELF we need the `.type' directive to make shared libs work right.  */
29#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
30#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
31
32#else
33
34#define ALIGNARG(log2) log2
35#define ASM_TYPE_DIRECTIVE(name,type)	/* Nothing is specified.  */
36#define ASM_SIZE_DIRECTIVE(name)	/* Nothing is specified.  */
37
38#endif
39
40
41/* Define an entry point visible from C.  */
42#define	ENTRY(name)							      \
43  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);				      \
44  ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)			      \
45  .align ALIGNARG(4);							      \
46  C_LABEL(name)								      \
47  cfi_startproc;							      \
48  CALL_MCOUNT
49
50#undef	END
51#define END(name)							      \
52  cfi_endproc;								      \
53  ASM_SIZE_DIRECTIVE(name)
54
55/* If compiled for profiling, call `mcount' at the start of each function.  */
56#ifdef	PROF
57/* The mcount code relies on a normal frame pointer being on the stack
58   to locate our caller, so push one just for its benefit.  */
59#define CALL_MCOUNT                                                          \
60  pushq %rbp;                                                                \
61  cfi_adjust_cfa_offset(8);                                                  \
62  movq %rsp, %rbp;                                                           \
63  cfi_def_cfa_register(%rbp);                                                \
64  call JUMPTARGET(mcount);                                                   \
65  popq %rbp;                                                                 \
66  cfi_def_cfa(rsp,8);
67#else
68#define CALL_MCOUNT		/* Do nothing.  */
69#endif
70
71/* Since C identifiers are not normally prefixed with an underscore
72   on this system, the asm identifier `syscall_error' intrudes on the
73   C name space.  Make sure we use an innocuous name.  */
74#define	syscall_error	__syscall_error
75#define mcount		_mcount
76
77#define	PSEUDO(name, syscall_name, args)				      \
78lose:									      \
79  jmp JUMPTARGET(syscall_error)						      \
80  .globl syscall_error;							      \
81  ENTRY (name)								      \
82  DO_CALL (syscall_name, args);						      \
83  jb lose
84
85#undef	PSEUDO_END
86#define	PSEUDO_END(name)						      \
87  END (name)
88
89#undef JUMPTARGET
90#ifdef PIC
91#define JUMPTARGET(name)	name##@PLT
92#else
93#define JUMPTARGET(name)	name
94#endif
95
96/* Local label name for asm code. */
97#ifndef L
98# ifdef HAVE_ELF
99/* ELF-like local names start with `.L'.  */
100#  define L(name)	.L##name
101# else
102#  define L(name)	name
103# endif
104#endif
105
106#endif	/* __ASSEMBLER__ */
107