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