summary refs log tree commit diff
path: root/sysdeps/aarch64/sysdep.h
blob: d3ff68589597cd58297a8630c9f9d45fb741988d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/* Copyright (C) 1997-2019 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _AARCH64_SYSDEP_H
#define _AARCH64_SYSDEP_H

#include <sysdeps/generic/sysdep.h>

#ifdef __LP64__
# define AARCH64_R(NAME)	R_AARCH64_ ## NAME
# define PTR_REG(n)		x##n
# define PTR_LOG_SIZE		3
# define DELOUSE(n)
#else
# define AARCH64_R(NAME)	R_AARCH64_P32_ ## NAME
# define PTR_REG(n)		w##n
# define PTR_LOG_SIZE		2
# define DELOUSE(n)		mov     w##n, w##n
#endif

#define PTR_SIZE	(1<<PTR_LOG_SIZE)

#ifdef	__ASSEMBLER__

/* Syntactic details of assembler.  */

#define ASM_SIZE_DIRECTIVE(name) .size name,.-name

/* Define an entry point visible from C.  */
#define ENTRY(name)						\
  .globl C_SYMBOL_NAME(name);					\
  .type C_SYMBOL_NAME(name),%function;				\
  .align 4;							\
  C_LABEL(name)							\
  cfi_startproc;						\
  CALL_MCOUNT

/* Define an entry point visible from C.  */
#define ENTRY_ALIGN(name, align)				\
  .globl C_SYMBOL_NAME(name);					\
  .type C_SYMBOL_NAME(name),%function;				\
  .p2align align;						\
  C_LABEL(name)							\
  cfi_startproc;						\
  CALL_MCOUNT

/* Define an entry point visible from C with a specified alignment and
   pre-padding with NOPs.  This can be used to ensure that a critical
   loop within a function is cache line aligned.  Note this version
   does not adjust the padding if CALL_MCOUNT is defined. */

#define ENTRY_ALIGN_AND_PAD(name, align, padding)		\
  .globl C_SYMBOL_NAME(name);					\
  .type C_SYMBOL_NAME(name),%function;				\
  .p2align align;						\
  .rep padding;							\
  nop;								\
  .endr;							\
  C_LABEL(name)							\
  cfi_startproc;						\
  CALL_MCOUNT

#undef	END
#define END(name)						\
  cfi_endproc;							\
  ASM_SIZE_DIRECTIVE(name)

/* If compiled for profiling, call `mcount' at the start of each function.  */
#ifdef	PROF
# define CALL_MCOUNT						\
	str	x30, [sp, #-80]!;				\
	cfi_adjust_cfa_offset (80);				\
	cfi_rel_offset (x30, 0);				\
	stp	x0, x1, [sp, #16];				\
	cfi_rel_offset (x0, 16);				\
	cfi_rel_offset (x1, 24);				\
	stp	x2, x3, [sp, #32];				\
	cfi_rel_offset (x2, 32);				\
	cfi_rel_offset (x3, 40);				\
	stp	x4, x5, [sp, #48];				\
	cfi_rel_offset (x4, 48);				\
	cfi_rel_offset (x5, 56);				\
	stp	x6, x7, [sp, #64];				\
	cfi_rel_offset (x6, 64);				\
	cfi_rel_offset (x7, 72);				\
	mov	x0, x30;					\
	bl	mcount;						\
	ldp	x0, x1, [sp, #16];				\
	cfi_restore (x0);					\
	cfi_restore (x1);					\
	ldp	x2, x3, [sp, #32];				\
	cfi_restore (x2);					\
	cfi_restore (x3);					\
	ldp	x4, x5, [sp, #48];				\
	cfi_restore (x4);					\
	cfi_restore (x5);					\
	ldp	x6, x7, [sp, #64];				\
	cfi_restore (x6);					\
	cfi_restore (x7);					\
	ldr	x30, [sp], #80;					\
	cfi_adjust_cfa_offset (-80);				\
	cfi_restore (x30);
#else
# define CALL_MCOUNT		/* Do nothing.  */
#endif

/* Local label name for asm code.  */
#ifndef L
# define L(name)         .L##name
#endif

/* Load or store to/from a pc-relative EXPR into/from R, using T.
   Note R and T are register numbers and not register names.  */
#define LDST_PCREL(OP, R, T, EXPR)			\
	adrp	x##T, EXPR;				\
	OP	PTR_REG (R), [x##T, #:lo12:EXPR];	\

/* Load or store to/from a got-relative EXPR into/from R, using T.
   Note R and T are register numbers and not register names.  */
#define LDST_GLOBAL(OP, R, T,  EXPR)			\
	adrp	x##T, :got:EXPR;			\
	ldr	PTR_REG (T), [x##T, #:got_lo12:EXPR];	\
	OP	PTR_REG (R), [x##T];

/* Load an immediate into R.
   Note R is a register number and not a register name.  */
#ifdef __LP64__
# define MOVL(R, NAME)					\
	movz	PTR_REG (R), #:abs_g3:NAME;		\
	movk	PTR_REG (R), #:abs_g2_nc:NAME;		\
	movk	PTR_REG (R), #:abs_g1_nc:NAME;		\
	movk	PTR_REG (R), #:abs_g0_nc:NAME;
#else
# define MOVL(R, NAME)					\
	movz	PTR_REG (R), #:abs_g1:NAME;		\
	movk	PTR_REG (R), #:abs_g0_nc:NAME;
#endif

/* Since C identifiers are not normally prefixed with an underscore
   on this system, the asm identifier `syscall_error' intrudes on the
   C name space.  Make sure we use an innocuous name.  */
#define syscall_error	__syscall_error
#define mcount		_mcount

#endif	/* __ASSEMBLER__ */

#endif  /* _AARCH64_SYSDEP_H */