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_FLAT_H 11 #define _LINUX_FLAT_H 12 13 #ifdef __KERNEL__ 14 #include <asm/flat.h> 15 #endif 16 17 #define FLAT_VERSION 0x00000004L 18 19 #ifdef CONFIG_BINFMT_SHARED_FLAT 20 #define MAX_SHARED_LIBS (4) 21 #else 22 #define MAX_SHARED_LIBS (1) 23 #endif 24 25 /* 26 * To make everything easier to port and manage cross platform 27 * development, all fields are in network byte order. 28 */ 29 30 struct flat_hdr { 31 char magic[4]; 32 unsigned long rev; /* version (as above) */ 33 unsigned long entry; /* Offset of first executable instruction 34 with text segment from beginning of file */ 35 unsigned long data_start; /* Offset of data segment from beginning of 36 file */ 37 unsigned long data_end; /* Offset of end of data segment 38 from beginning of file */ 39 unsigned long bss_end; /* Offset of end of bss segment from beginning 40 of file */ 41 42 /* (It is assumed that data_end through bss_end forms the bss segment.) */ 43 44 unsigned long stack_size; /* Size of stack, in bytes */ 45 unsigned long reloc_start; /* Offset of relocation records from 46 beginning of file */ 47 unsigned long reloc_count; /* Number of relocation records */ 48 unsigned long flags; 49 unsigned long build_date; /* When the program/library was built */ 50 unsigned long filler[5]; /* Reservered, set to zero */ 51 }; 52 53 #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */ 54 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */ 55 #define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */ 56 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */ 57 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */ 58 59 60 #ifdef __KERNEL__ /* so systems without linux headers can compile the apps */ 61 /* 62 * While it would be nice to keep this header clean, users of older 63 * tools still need this support in the kernel. So this section is 64 * purely for compatibility with old tool chains. 65 * 66 * DO NOT make changes or enhancements to the old format please, just work 67 * with the format above, except to fix bugs with old format support. 68 */ 69 70 #include <asm/byteorder.h> 71 72 #define OLD_FLAT_VERSION 0x00000002L 73 #define OLD_FLAT_RELOC_TYPE_TEXT 0 74 #define OLD_FLAT_RELOC_TYPE_DATA 1 75 #define OLD_FLAT_RELOC_TYPE_BSS 2 76 77 typedef union { 78 unsigned long value; 79 struct { 80 # if defined(mc68000) && !defined(CONFIG_COLDFIRE) 81 signed long offset : 30; 82 unsigned long type : 2; 83 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ 84 # elif defined(__BIG_ENDIAN_BITFIELD) 85 unsigned long type : 2; 86 signed long offset : 30; 87 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ 88 # elif defined(__LITTLE_ENDIAN_BITFIELD) 89 signed long offset : 30; 90 unsigned long type : 2; 91 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ 92 # else 93 # error "Unknown bitfield order for flat files." 94 # endif 95 } reloc; 96 } flat_v2_reloc_t; 97 98 #endif /* __KERNEL__ */ 99 100 #endif /* _LINUX_FLAT_H */ 101