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