1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> 4 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> 5 * The Silver Hammer Group, Ltd. 6 * 7 * This file provides the definitions and structures needed to 8 * support uClinux flat-format executables. 9 */ 10 #ifndef _LINUX_FLAT_H 11 #define _LINUX_FLAT_H 12 13 #define FLAT_VERSION 0x00000004L 14 15 /* 16 * To make everything easier to port and manage cross platform 17 * development, all fields are in network byte order. 18 */ 19 20 struct flat_hdr { 21 char magic[4]; 22 __be32 rev; /* version (as above) */ 23 __be32 entry; /* Offset of first executable instruction 24 with text segment from beginning of file */ 25 __be32 data_start; /* Offset of data segment from beginning of 26 file */ 27 __be32 data_end; /* Offset of end of data segment from beginning 28 of file */ 29 __be32 bss_end; /* Offset of end of bss segment from beginning 30 of file */ 31 32 /* (It is assumed that data_end through bss_end forms the bss segment.) */ 33 34 __be32 stack_size; /* Size of stack, in bytes */ 35 __be32 reloc_start; /* Offset of relocation records from beginning of 36 file */ 37 __be32 reloc_count; /* Number of relocation records */ 38 __be32 flags; 39 __be32 build_date; /* When the program/library was built */ 40 __u32 filler[5]; /* Reservered, set to zero */ 41 }; 42 43 #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */ 44 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */ 45 #define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */ 46 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */ 47 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */ 48 49 /* 50 * While it would be nice to keep this header clean, users of older 51 * tools still need this support in the kernel. So this section is 52 * purely for compatibility with old tool chains. 53 * 54 * DO NOT make changes or enhancements to the old format please, just work 55 * with the format above, except to fix bugs with old format support. 56 */ 57 58 #define OLD_FLAT_VERSION 0x00000002L 59 #define OLD_FLAT_RELOC_TYPE_TEXT 0 60 #define OLD_FLAT_RELOC_TYPE_DATA 1 61 #define OLD_FLAT_RELOC_TYPE_BSS 2 62 63 typedef union { 64 u32 value; 65 struct { 66 #if defined(__LITTLE_ENDIAN_BITFIELD) || \ 67 (defined(mc68000) && !defined(CONFIG_COLDFIRE)) 68 s32 offset : 30; 69 u32 type : 2; 70 # elif defined(__BIG_ENDIAN_BITFIELD) 71 u32 type : 2; 72 s32 offset : 30; 73 # else 74 # error "Unknown bitfield order for flat files." 75 # endif 76 } reloc; 77 } flat_v2_reloc_t; 78 79 #endif /* _LINUX_FLAT_H */ 80