1 /*
2  * Copyright (c) 2011 The Chromium OS Authors.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation; either version 2 of
7  * the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
17  * MA 02111-1307 USA
18  */
19 
20 /* Taken from Linux kernel, commit f56c3196 */
21 
22 #ifndef _ASM_GENERIC_SECTIONS_H_
23 #define _ASM_GENERIC_SECTIONS_H_
24 
25 /* References to section boundaries */
26 
27 extern char _text[], _stext[], _etext[];
28 extern char _data[], _sdata[], _edata[];
29 extern char __bss_start[], __bss_stop[];
30 extern char __init_begin[], __init_end[];
31 extern char _sinittext[], _einittext[];
32 extern char _end[];
33 extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
34 extern char __kprobes_text_start[], __kprobes_text_end[];
35 extern char __entry_text_start[], __entry_text_end[];
36 extern char __initdata_begin[], __initdata_end[];
37 extern char __start_rodata[], __end_rodata[];
38 
39 /* Start and end of .ctors section - used for constructor calls. */
40 extern char __ctors_start[], __ctors_end[];
41 
42 /* function descriptor handling (if any).  Override
43  * in asm/sections.h */
44 #ifndef dereference_function_descriptor
45 #define dereference_function_descriptor(p) (p)
46 #endif
47 
48 /* random extra sections (if any).  Override
49  * in asm/sections.h */
50 #ifndef arch_is_kernel_text
51 static inline int arch_is_kernel_text(unsigned long addr)
52 {
53 	return 0;
54 }
55 #endif
56 
57 #ifndef arch_is_kernel_data
58 static inline int arch_is_kernel_data(unsigned long addr)
59 {
60 	return 0;
61 }
62 #endif
63 
64 /* U-Boot-specific things begin here */
65 
66 /* Start of U-Boot text region */
67 extern char __text_start[];
68 
69 /* This marks the end of the text region which must be relocated */
70 extern char __image_copy_end[];
71 
72 /*
73  * This is the U-Boot entry point - prior to relocation it should be same
74  * as __text_start
75  */
76 extern void _start(void);
77 
78 /*
79  * ARM needs to use offsets for symbols, since the values of some symbols
80  * are not resolved prior to relocation (and are just 0). Maybe this can be
81  * resolved, or maybe other architectures are similar, iwc this should be
82  * promoted to an architecture option.
83  */
84 #ifdef CONFIG_ARM
85 #define CONFIG_SYS_SYM_OFFSETS
86 #endif
87 
88 #ifdef CONFIG_SYS_SYM_OFFSETS
89 /* Start/end of the relocation entries, as an offset from _start */
90 extern ulong _rel_dyn_start_ofs;
91 extern ulong _rel_dyn_end_ofs;
92 
93 /* Start/end of the relocation symbol table, as an offset from _start */
94 extern ulong _dynsym_start_ofs;
95 
96 /* End of the region to be relocated, as an offset form _start */
97 extern ulong _image_copy_end_ofs;
98 
99 extern ulong _bss_start_ofs;	/* BSS start relative to _start */
100 extern ulong _bss_end_ofs;		/* BSS end relative to _start */
101 extern ulong _end_ofs;		/* end of image relative to _start */
102 
103 extern ulong _TEXT_BASE;	/* code start */
104 
105 #else /* don't use offsets: */
106 
107 /* Exports from the Linker Script */
108 extern ulong __data_end;
109 extern ulong __rel_dyn_start;
110 extern ulong __rel_dyn_end;
111 extern ulong __bss_end;
112 
113 extern ulong _TEXT_BASE;	/* code start */
114 
115 #endif
116 
117 #endif /* _ASM_GENERIC_SECTIONS_H_ */
118