1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef _ASM_GENERIC_SECTIONS_H_
3 #define _ASM_GENERIC_SECTIONS_H_
4
5 /* References to section boundaries */
6
7 #include <linux/compiler.h>
8 #include <linux/types.h>
9
10 /*
11 * Usage guidelines:
12 * _text, _data: architecture specific, don't
13 * [_stext, _etext]: contains .text.* sections
14 * and/or .init.* sections
15 * [_sdata, _edata]: contains .data.* sections
16 * and/or .init.* sections.
17 * [__start_rodata, __end_rodata]: contains .r
18 * [__start_ro_after_init, __end_ro_after_init
19 * contains .data..ro_after_
20 * [__init_begin, __init_end]: contains .init.
21 * may be out of this range
22 * [_sinittext, _einittext]: contains .init.te
23 * [__bss_start, __bss_stop]: contains BSS sec
24 *
25 * Following global variables are optional and
26 * architectures and/or kernel configurations.
27 * _text, _data
28 * __kprobes_text_start, __kprobes_text_e
29 * __entry_text_start, __entry_text_end
30 * __ctors_start, __ctors_end
31 * __irqentry_text_start, __irqentry_text
32 * __softirqentry_text_start, __softirqen
33 * __start_opd, __end_opd
34 */
35 extern char _text[], _stext[], _etext[];
36 extern char _data[], _sdata[], _edata[];
37 extern char __bss_start[], __bss_stop[];
38 extern char __init_begin[], __init_end[];
39 extern char _sinittext[], _einittext[];
40 extern char __start_ro_after_init[], __end_ro_
41 extern char _end[];
42 extern char __per_cpu_load[], __per_cpu_start[
43 extern char __kprobes_text_start[], __kprobes_
44 extern char __entry_text_start[], __entry_text
45 extern char __start_rodata[], __end_rodata[];
46 extern char __irqentry_text_start[], __irqentr
47 extern char __softirqentry_text_start[], __sof
48 extern char __start_once[], __end_once[];
49
50 /* Start and end of .ctors section - used for
51 extern char __ctors_start[], __ctors_end[];
52
53 /* Start and end of .opd section - used for fu
54 extern char __start_opd[], __end_opd[];
55
56 /* Start and end of instrumentation protected
57 extern char __noinstr_text_start[], __noinstr_
58
59 extern __visible const void __nosave_begin, __
60
61 /* Function descriptor handling (if any). Ove
62 #ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
63 void *dereference_function_descriptor(void *pt
64 void *dereference_kernel_function_descriptor(v
65 #else
66 #define dereference_function_descriptor(p) ((v
67 #define dereference_kernel_function_descriptor
68
69 /* An address is simply the address of the fun
70 typedef struct {
71 unsigned long addr;
72 } func_desc_t;
73 #endif
74
75 static inline bool have_function_descriptors(v
76 {
77 return IS_ENABLED(CONFIG_HAVE_FUNCTION
78 }
79
80 /**
81 * memory_contains - checks if an object is co
82 * @begin: virtual address of the beginning of
83 * @end: virtual address of the end of the mem
84 * @virt: virtual address of the memory object
85 * @size: size of the memory object
86 *
87 * Returns: true if the object specified by @v
88 * contained within the memory region defined
89 * otherwise.
90 */
91 static inline bool memory_contains(void *begin
92 size_t size
93 {
94 return virt >= begin && virt + size <=
95 }
96
97 /**
98 * memory_intersects - checks if the region oc
99 * with another memory reg
100 * @begin: virtual address of the beginning of
101 * @end: virtual address of the end of the mem
102 * @virt: virtual address of the memory object
103 * @size: size of the memory object
104 *
105 * Returns: true if an object's memory region,
106 * intersects with the region specified by @be
107 */
108 static inline bool memory_intersects(void *beg
109 size_t si
110 {
111 void *vend = virt + size;
112
113 if (virt < end && vend > begin)
114 return true;
115
116 return false;
117 }
118
119 /**
120 * init_section_contains - checks if an object
121 * section
122 * @virt: virtual address of the memory object
123 * @size: size of the memory object
124 *
125 * Returns: true if the object specified by @v
126 * contained within the init section, false ot
127 */
128 static inline bool init_section_contains(void
129 {
130 return memory_contains(__init_begin, _
131 }
132
133 /**
134 * init_section_intersects - checks if the reg
135 * intersects with t
136 * @virt: virtual address of the memory object
137 * @size: size of the memory object
138 *
139 * Returns: true if an object's memory region,
140 * intersects with the init section, false oth
141 */
142 static inline bool init_section_intersects(voi
143 {
144 return memory_intersects(__init_begin,
145 }
146
147 /**
148 * is_kernel_core_data - checks if the pointer
149 * .data or .bss section
150 *
151 * @addr: address to check
152 *
153 * Returns: true if the address is located in
154 * Note: On some archs it may return true for
155 * for others. But will always be true f
156 */
157 static inline bool is_kernel_core_data(unsigne
158 {
159 if (addr >= (unsigned long)_sdata && a
160 return true;
161
162 if (addr >= (unsigned long)__bss_start
163 addr < (unsigned long)__bss_stop)
164 return true;
165
166 return false;
167 }
168
169 /**
170 * is_kernel_rodata - checks if the pointer ad
171 * .rodata section
172 *
173 * @addr: address to check
174 *
175 * Returns: true if the address is located in
176 */
177 static inline bool is_kernel_rodata(unsigned l
178 {
179 return addr >= (unsigned long)__start_
180 addr < (unsigned long)__end_rod
181 }
182
183 static inline bool is_kernel_ro_after_init(uns
184 {
185 return addr >= (unsigned long)__start_
186 addr < (unsigned long)__end_ro_
187 }
188 /**
189 * is_kernel_inittext - checks if the pointer
190 * .init.text section
191 *
192 * @addr: address to check
193 *
194 * Returns: true if the address is located in
195 */
196 static inline bool is_kernel_inittext(unsigned
197 {
198 return addr >= (unsigned long)_sinitte
199 addr < (unsigned long)_einittex
200 }
201
202 /**
203 * __is_kernel_text - checks if the pointer ad
204 * .text section
205 *
206 * @addr: address to check
207 *
208 * Returns: true if the address is located in
209 * Note: an internal helper, only check the ra
210 */
211 static inline bool __is_kernel_text(unsigned l
212 {
213 return addr >= (unsigned long)_stext &
214 addr < (unsigned long)_etext;
215 }
216
217 /**
218 * __is_kernel - checks if the pointer address
219 *
220 * @addr: address to check
221 *
222 * Returns: true if the address is located in
223 * Note: an internal helper, check the range o
224 * and range from __init_begin to __init
225 * of the _stext to _end range.
226 */
227 static inline bool __is_kernel(unsigned long a
228 {
229 return ((addr >= (unsigned long)_stext
230 addr < (unsigned long)_end) |
231 (addr >= (unsigned long)__init
232 addr < (unsigned long)__init_
233 }
234
235 #endif /* _ASM_GENERIC_SECTIONS_H_ */
236
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