1#ifndef _ASM_X86_DWARF2_H
2#define _ASM_X86_DWARF2_H
3
4#ifndef __ASSEMBLY__
5#warning "asm/dwarf2.h should be only included in pure assembly files"
6#endif
7
8/*
9 * Macros for dwarf2 CFI unwind table entries.
10 * See "as.info" for details on these pseudo ops. Unfortunately
11 * they are only supported in very new binutils, so define them
12 * away for older version.
13 */
14
15#ifdef CONFIG_AS_CFI
16
17#define CFI_STARTPROC		.cfi_startproc
18#define CFI_ENDPROC		.cfi_endproc
19#define CFI_DEF_CFA		.cfi_def_cfa
20#define CFI_DEF_CFA_REGISTER	.cfi_def_cfa_register
21#define CFI_DEF_CFA_OFFSET	.cfi_def_cfa_offset
22#define CFI_ADJUST_CFA_OFFSET	.cfi_adjust_cfa_offset
23#define CFI_OFFSET		.cfi_offset
24#define CFI_REL_OFFSET		.cfi_rel_offset
25#define CFI_REGISTER		.cfi_register
26#define CFI_RESTORE		.cfi_restore
27#define CFI_REMEMBER_STATE	.cfi_remember_state
28#define CFI_RESTORE_STATE	.cfi_restore_state
29#define CFI_UNDEFINED		.cfi_undefined
30#define CFI_ESCAPE		.cfi_escape
31
32#ifdef CONFIG_AS_CFI_SIGNAL_FRAME
33#define CFI_SIGNAL_FRAME	.cfi_signal_frame
34#else
35#define CFI_SIGNAL_FRAME
36#endif
37
38#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
39	/*
40	 * Emit CFI data in .debug_frame sections, not .eh_frame sections.
41	 * The latter we currently just discard since we don't do DWARF
42	 * unwinding at runtime.  So only the offline DWARF information is
43	 * useful to anyone.  Note we should not use this directive if this
44	 * file is used in the vDSO assembly, or if vmlinux.lds.S gets
45	 * changed so it doesn't discard .eh_frame.
46	 */
47	.cfi_sections .debug_frame
48#endif
49
50#else
51
52/*
53 * Due to the structure of pre-exisiting code, don't use assembler line
54 * comment character # to ignore the arguments. Instead, use a dummy macro.
55 */
56.macro cfi_ignore a=0, b=0, c=0, d=0
57.endm
58
59#define CFI_STARTPROC		cfi_ignore
60#define CFI_ENDPROC		cfi_ignore
61#define CFI_DEF_CFA		cfi_ignore
62#define CFI_DEF_CFA_REGISTER	cfi_ignore
63#define CFI_DEF_CFA_OFFSET	cfi_ignore
64#define CFI_ADJUST_CFA_OFFSET	cfi_ignore
65#define CFI_OFFSET		cfi_ignore
66#define CFI_REL_OFFSET		cfi_ignore
67#define CFI_REGISTER		cfi_ignore
68#define CFI_RESTORE		cfi_ignore
69#define CFI_REMEMBER_STATE	cfi_ignore
70#define CFI_RESTORE_STATE	cfi_ignore
71#define CFI_UNDEFINED		cfi_ignore
72#define CFI_ESCAPE		cfi_ignore
73#define CFI_SIGNAL_FRAME	cfi_ignore
74
75#endif
76
77/*
78 * An attempt to make CFI annotations more or less
79 * correct and shorter. It is implied that you know
80 * what you're doing if you use them.
81 */
82#ifdef __ASSEMBLY__
83#ifdef CONFIG_X86_64
84	.macro pushq_cfi reg
85	pushq \reg
86	CFI_ADJUST_CFA_OFFSET 8
87	.endm
88
89	.macro pushq_cfi_reg reg
90	pushq %\reg
91	CFI_ADJUST_CFA_OFFSET 8
92	CFI_REL_OFFSET \reg, 0
93	.endm
94
95	.macro popq_cfi reg
96	popq \reg
97	CFI_ADJUST_CFA_OFFSET -8
98	.endm
99
100	.macro popq_cfi_reg reg
101	popq %\reg
102	CFI_ADJUST_CFA_OFFSET -8
103	CFI_RESTORE \reg
104	.endm
105
106	.macro pushfq_cfi
107	pushfq
108	CFI_ADJUST_CFA_OFFSET 8
109	.endm
110
111	.macro popfq_cfi
112	popfq
113	CFI_ADJUST_CFA_OFFSET -8
114	.endm
115
116	.macro movq_cfi reg offset=0
117	movq %\reg, \offset(%rsp)
118	CFI_REL_OFFSET \reg, \offset
119	.endm
120
121	.macro movq_cfi_restore offset reg
122	movq \offset(%rsp), %\reg
123	CFI_RESTORE \reg
124	.endm
125#else /*!CONFIG_X86_64*/
126	.macro pushl_cfi reg
127	pushl \reg
128	CFI_ADJUST_CFA_OFFSET 4
129	.endm
130
131	.macro pushl_cfi_reg reg
132	pushl %\reg
133	CFI_ADJUST_CFA_OFFSET 4
134	CFI_REL_OFFSET \reg, 0
135	.endm
136
137	.macro popl_cfi reg
138	popl \reg
139	CFI_ADJUST_CFA_OFFSET -4
140	.endm
141
142	.macro popl_cfi_reg reg
143	popl %\reg
144	CFI_ADJUST_CFA_OFFSET -4
145	CFI_RESTORE \reg
146	.endm
147
148	.macro pushfl_cfi
149	pushfl
150	CFI_ADJUST_CFA_OFFSET 4
151	.endm
152
153	.macro popfl_cfi
154	popfl
155	CFI_ADJUST_CFA_OFFSET -4
156	.endm
157
158	.macro movl_cfi reg offset=0
159	movl %\reg, \offset(%esp)
160	CFI_REL_OFFSET \reg, \offset
161	.endm
162
163	.macro movl_cfi_restore offset reg
164	movl \offset(%esp), %\reg
165	CFI_RESTORE \reg
166	.endm
167#endif /*!CONFIG_X86_64*/
168#endif /*__ASSEMBLY__*/
169
170#endif /* _ASM_X86_DWARF2_H */
171