flat.h (2605B)
1 /* 2 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> 3 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> 4 * The Silver Hammer Group, Ltd. 5 * 6 * This file provides the definitions and structures needed to 7 * support uClinux flat-format executables. 8 */ 9 10 #ifndef LINUX_USER_FLAT_H 11 #define LINUX_USER_FLAT_H 12 13 #define FLAT_VERSION 0x00000004L 14 15 #ifdef CONFIG_BINFMT_SHARED_FLAT 16 #define MAX_SHARED_LIBS (4) 17 #else 18 #define MAX_SHARED_LIBS (1) 19 #endif 20 21 /* 22 * To make everything easier to port and manage cross platform 23 * development, all fields are in network byte order. 24 */ 25 26 struct flat_hdr { 27 char magic[4]; 28 abi_ulong rev; /* version (as above) */ 29 abi_ulong entry; /* Offset of first executable instruction 30 with text segment from beginning of file */ 31 abi_ulong data_start; /* Offset of data segment from beginning of 32 file */ 33 abi_ulong data_end; /* Offset of end of data segment 34 from beginning of file */ 35 abi_ulong bss_end; /* Offset of end of bss segment from beginning 36 of file */ 37 38 /* (It is assumed that data_end through bss_end forms the bss segment.) */ 39 40 abi_ulong stack_size; /* Size of stack, in bytes */ 41 abi_ulong reloc_start; /* Offset of relocation records from 42 beginning of file */ 43 abi_ulong reloc_count; /* Number of relocation records */ 44 abi_ulong flags; 45 abi_ulong build_date; /* When the program/library was built */ 46 abi_ulong filler[5]; /* Reserved, set to zero */ 47 }; 48 49 #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */ 50 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */ 51 #define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */ 52 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */ 53 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */ 54 55 56 /* 57 * While it would be nice to keep this header clean, users of older 58 * tools still need this support in the kernel. So this section is 59 * purely for compatibility with old tool chains. 60 * 61 * DO NOT make changes or enhancements to the old format please, just work 62 * with the format above, except to fix bugs with old format support. 63 */ 64 65 #define OLD_FLAT_VERSION 0x00000002L 66 #define OLD_FLAT_RELOC_TYPE_TEXT 0 67 #define OLD_FLAT_RELOC_TYPE_DATA 1 68 #define OLD_FLAT_RELOC_TYPE_BSS 2 69 70 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ 71 72 #endif