aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/dwarf2.h
blob: 326099199318c4ce1066a03a04220c08914ca890 (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
#ifndef _ASM_X86_DWARF2_H
#define _ASM_X86_DWARF2_H

#ifndef __ASSEMBLY__
#warning "asm/dwarf2.h should be only included in pure assembly files"
#endif

/*
 * Macros for dwarf2 CFI unwind table entries.
 * See "as.info" for details on these pseudo ops. Unfortunately
 * they are only supported in very new binutils, so define them
 * away for older version.
 */

#ifdef CONFIG_AS_CFI

#define CFI_STARTPROC		.cfi_startproc
#define CFI_ENDPROC		.cfi_endproc
#define CFI_DEF_CFA		.cfi_def_cfa
#define CFI_DEF_CFA_REGISTER	.cfi_def_cfa_register
#define CFI_DEF_CFA_OFFSET	.cfi_def_cfa_offset
#define CFI_ADJUST_CFA_OFFSET	.cfi_adjust_cfa_offset
#define CFI_OFFSET		.cfi_offset
#define CFI_REL_OFFSET		.cfi_rel_offset
#define CFI_REGISTER		.cfi_register
#define CFI_RESTORE		.cfi_restore
#define CFI_REMEMBER_STATE	.cfi_remember_state
#define CFI_RESTORE_STATE	.cfi_restore_state
#define CFI_UNDEFINED		.cfi_undefined

#ifdef CONFIG_AS_CFI_SIGNAL_FRAME
#define CFI_SIGNAL_FRAME	.cfi_signal_frame
#else
#define CFI_SIGNAL_FRAME
#endif

#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
	/*
	 * Emit CFI data in .debug_frame sections, not .eh_frame sections.
	 * The latter we currently just discard since we don't do DWARF
	 * unwinding at runtime.  So only the offline DWARF information is
	 * useful to anyone.  Note we should not use this directive if this
	 * file is used in the vDSO assembly, or if vmlinux.lds.S gets
	 * changed so it doesn't discard .eh_frame.
	 */
	.cfi_sections .debug_frame
#endif

#else

/*
 * Due to the structure of pre-exisiting code, don't use assembler line
 * comment character # to ignore the arguments. Instead, use a dummy macro.
 */
.macro cfi_ignore a=0, b=0, c=0, d=0
.endm

#define CFI_STARTPROC		cfi_ignore
#define CFI_ENDPROC		cfi_ignore
#define CFI_DEF_CFA		cfi_ignore
#define CFI_DEF_CFA_REGISTER	cfi_ignore
#define CFI_DEF_CFA_OFFSET	cfi_ignore
#define CFI_ADJUST_CFA_OFFSET	cfi_ignore
#define CFI_OFFSET		cfi_ignore
#define CFI_REL_OFFSET		cfi_ignore
#define CFI_REGISTER		cfi_ignore
#define CFI_RESTORE		cfi_ignore
#define CFI_REMEMBER_STATE	cfi_ignore
#define CFI_RESTORE_STATE	cfi_ignore
#define CFI_UNDEFINED		cfi_ignore
#define CFI_SIGNAL_FRAME	cfi_ignore

#endif

/*
 * An attempt to make CFI annotations more or less
 * correct and shorter. It is implied that you know
 * what you're doing if you use them.
 */
#ifdef __ASSEMBLY__
#ifdef CONFIG_X86_64
	.macro pushq_cfi reg
	pushq \reg
	CFI_ADJUST_CFA_OFFSET 8
	.endm

	.macro popq_cfi reg
	popq \reg
	CFI_ADJUST_CFA_OFFSET -8
	.endm

	.macro pushfq_cfi
	pushfq
	CFI_ADJUST_CFA_OFFSET 8
	.endm

	.macro popfq_cfi
	popfq
	CFI_ADJUST_CFA_OFFSET -8
	.endm

	.macro movq_cfi reg offset=0
	movq %\reg, \offset(%rsp)
	CFI_REL_OFFSET \reg, \offset
	.endm

	.macro movq_cfi_restore offset reg
	movq \offset(%rsp), %\reg
	CFI_RESTORE \reg
	.endm
#else /*!CONFIG_X86_64*/
	.macro pushl_cfi reg
	pushl \reg
	CFI_ADJUST_CFA_OFFSET 4
	.endm

	.macro popl_cfi reg
	popl \reg
	CFI_ADJUST_CFA_OFFSET -4
	.endm

	.macro pushfl_cfi
	pushfl
	CFI_ADJUST_CFA_OFFSET 4
	.endm

	.macro popfl_cfi
	popfl
	CFI_ADJUST_CFA_OFFSET -4
	.endm

	.macro movl_cfi reg offset=0
	movl %\reg, \offset(%esp)
	CFI_REL_OFFSET \reg, \offset
	.endm

	.macro movl_cfi_restore offset reg
	movl \offset(%esp), %\reg
	CFI_RESTORE \reg
	.endm
#endif /*!CONFIG_X86_64*/
#endif /*__ASSEMBLY__*/

#endif /* _ASM_X86_DWARF2_H */