1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 /* Taken from Linux kernel, commit f56c3196 */ 8 9 #ifndef _ASM_GENERIC_SECTIONS_H_ 10 #define _ASM_GENERIC_SECTIONS_H_ 11 12 /* References to section boundaries */ 13 14 extern char _text[], _stext[], _etext[]; 15 extern char _data[], _sdata[], _edata[]; 16 extern char __bss_start[], __bss_stop[]; 17 extern char __init_begin[], __init_end[]; 18 extern char _sinittext[], _einittext[]; 19 extern char _end[], _init[]; 20 extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[]; 21 extern char __kprobes_text_start[], __kprobes_text_end[]; 22 extern char __entry_text_start[], __entry_text_end[]; 23 extern char __initdata_begin[], __initdata_end[]; 24 extern char __start_rodata[], __end_rodata[]; 25 26 /* Start and end of .ctors section - used for constructor calls. */ 27 extern char __ctors_start[], __ctors_end[]; 28 29 /* function descriptor handling (if any). Override 30 * in asm/sections.h */ 31 #ifndef dereference_function_descriptor 32 #define dereference_function_descriptor(p) (p) 33 #endif 34 35 /* random extra sections (if any). Override 36 * in asm/sections.h */ 37 #ifndef arch_is_kernel_text 38 static inline int arch_is_kernel_text(unsigned long addr) 39 { 40 return 0; 41 } 42 #endif 43 44 #ifndef arch_is_kernel_data 45 static inline int arch_is_kernel_data(unsigned long addr) 46 { 47 return 0; 48 } 49 #endif 50 51 /* U-Boot-specific things begin here */ 52 53 /* Start of U-Boot text region */ 54 extern char __text_start[]; 55 56 /* This marks the end of the text region which must be relocated */ 57 extern char __image_copy_end[]; 58 59 /* 60 * This is the U-Boot entry point - prior to relocation it should be same 61 * as __text_start 62 */ 63 extern void _start(void); 64 65 /* 66 * ARM needs to use offsets for symbols, since the values of some symbols 67 * are not resolved prior to relocation (and are just 0). Maybe this can be 68 * resolved, or maybe other architectures are similar, iwc this should be 69 * promoted to an architecture option. 70 */ 71 #ifdef CONFIG_ARM 72 #define CONFIG_SYS_SYM_OFFSETS 73 #endif 74 75 #ifdef CONFIG_SYS_SYM_OFFSETS 76 /* Start/end of the relocation entries, as an offset from _start */ 77 extern ulong _rel_dyn_start_ofs; 78 extern ulong _rel_dyn_end_ofs; 79 80 /* End of the region to be relocated, as an offset form _start */ 81 extern ulong _image_copy_end_ofs; 82 83 extern ulong _bss_start_ofs; /* BSS start relative to _start */ 84 extern ulong _bss_end_ofs; /* BSS end relative to _start */ 85 extern ulong _end_ofs; /* end of image relative to _start */ 86 87 extern ulong _TEXT_BASE; /* code start */ 88 89 #else /* don't use offsets: */ 90 91 /* Exports from the Linker Script */ 92 extern ulong __data_end; 93 extern ulong __rel_dyn_start; 94 extern ulong __rel_dyn_end; 95 extern ulong __bss_end; 96 97 extern ulong _TEXT_BASE; /* code start */ 98 99 #endif 100 101 #endif /* _ASM_GENERIC_SECTIONS_H_ */ 102