1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> 4*4882a593Smuzhiyun * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> 5*4882a593Smuzhiyun * The Silver Hammer Group, Ltd. 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * This file provides the definitions and structures needed to 8*4882a593Smuzhiyun * support uClinux flat-format executables. 9*4882a593Smuzhiyun */ 10*4882a593Smuzhiyun #ifndef _LINUX_FLAT_H 11*4882a593Smuzhiyun #define _LINUX_FLAT_H 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #define FLAT_VERSION 0x00000004L 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /* 16*4882a593Smuzhiyun * To make everything easier to port and manage cross platform 17*4882a593Smuzhiyun * development, all fields are in network byte order. 18*4882a593Smuzhiyun */ 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun struct flat_hdr { 21*4882a593Smuzhiyun char magic[4]; 22*4882a593Smuzhiyun __be32 rev; /* version (as above) */ 23*4882a593Smuzhiyun __be32 entry; /* Offset of first executable instruction 24*4882a593Smuzhiyun with text segment from beginning of file */ 25*4882a593Smuzhiyun __be32 data_start; /* Offset of data segment from beginning of 26*4882a593Smuzhiyun file */ 27*4882a593Smuzhiyun __be32 data_end; /* Offset of end of data segment from beginning 28*4882a593Smuzhiyun of file */ 29*4882a593Smuzhiyun __be32 bss_end; /* Offset of end of bss segment from beginning 30*4882a593Smuzhiyun of file */ 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun /* (It is assumed that data_end through bss_end forms the bss segment.) */ 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun __be32 stack_size; /* Size of stack, in bytes */ 35*4882a593Smuzhiyun __be32 reloc_start; /* Offset of relocation records from beginning of 36*4882a593Smuzhiyun file */ 37*4882a593Smuzhiyun __be32 reloc_count; /* Number of relocation records */ 38*4882a593Smuzhiyun __be32 flags; 39*4882a593Smuzhiyun __be32 build_date; /* When the program/library was built */ 40*4882a593Smuzhiyun __u32 filler[5]; /* Reservered, set to zero */ 41*4882a593Smuzhiyun }; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */ 44*4882a593Smuzhiyun #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */ 45*4882a593Smuzhiyun #define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */ 46*4882a593Smuzhiyun #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */ 47*4882a593Smuzhiyun #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */ 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* 50*4882a593Smuzhiyun * While it would be nice to keep this header clean, users of older 51*4882a593Smuzhiyun * tools still need this support in the kernel. So this section is 52*4882a593Smuzhiyun * purely for compatibility with old tool chains. 53*4882a593Smuzhiyun * 54*4882a593Smuzhiyun * DO NOT make changes or enhancements to the old format please, just work 55*4882a593Smuzhiyun * with the format above, except to fix bugs with old format support. 56*4882a593Smuzhiyun */ 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun #define OLD_FLAT_VERSION 0x00000002L 59*4882a593Smuzhiyun #define OLD_FLAT_RELOC_TYPE_TEXT 0 60*4882a593Smuzhiyun #define OLD_FLAT_RELOC_TYPE_DATA 1 61*4882a593Smuzhiyun #define OLD_FLAT_RELOC_TYPE_BSS 2 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun typedef union { 64*4882a593Smuzhiyun u32 value; 65*4882a593Smuzhiyun struct { 66*4882a593Smuzhiyun #if defined(__LITTLE_ENDIAN_BITFIELD) || \ 67*4882a593Smuzhiyun (defined(mc68000) && !defined(CONFIG_COLDFIRE)) 68*4882a593Smuzhiyun s32 offset : 30; 69*4882a593Smuzhiyun u32 type : 2; 70*4882a593Smuzhiyun # elif defined(__BIG_ENDIAN_BITFIELD) 71*4882a593Smuzhiyun u32 type : 2; 72*4882a593Smuzhiyun s32 offset : 30; 73*4882a593Smuzhiyun # else 74*4882a593Smuzhiyun # error "Unknown bitfield order for flat files." 75*4882a593Smuzhiyun # endif 76*4882a593Smuzhiyun } reloc; 77*4882a593Smuzhiyun } flat_v2_reloc_t; 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun #endif /* _LINUX_FLAT_H */ 80