| 1 | /* `a.out.adobe' differences from standard a.out files
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| 2 |
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| 3 | Copyright 2001 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 2 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program; if not, write to the Free Software
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| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 18 |
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| 19 | #ifndef __A_OUT_ADOBE_H__
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| 20 | #define __A_OUT_ADOBE_H__
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| 21 |
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| 22 | #define BYTES_IN_WORD 4
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| 23 |
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| 24 | /* Struct external_exec is the same. */
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| 25 |
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| 26 | /* This is the layout on disk of the 32-bit or 64-bit exec header. */
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| 27 |
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| 28 | struct external_exec
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| 29 | {
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| 30 | bfd_byte e_info[4]; /* magic number and stuff */
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| 31 | bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes */
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| 32 | bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes */
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| 33 | bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes */
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| 34 | bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes */
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| 35 | bfd_byte e_entry[BYTES_IN_WORD]; /* start address */
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| 36 | bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info */
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| 37 | bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info */
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| 38 | };
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| 39 |
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| 40 | #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7)
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| 41 |
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| 42 | /* Magic numbers for a.out files */
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| 43 |
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| 44 | #undef ZMAGIC
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| 45 | #define ZMAGIC 0xAD0BE /* Cute, eh? */
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| 46 | #undef OMAGIC
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| 47 | #undef NMAGIC
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| 48 |
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| 49 | #define N_BADMAG(x) ((x).a_info != ZMAGIC)
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| 50 |
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| 51 | /* By default, segment size is constant. But some machines override this
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| 52 | to be a function of the a.out header (e.g. machine type). */
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| 53 | #ifndef N_SEGSIZE
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| 54 | #define N_SEGSIZE(x) SEGMENT_SIZE
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| 55 | #endif
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| 56 | #undef N_SEGSIZE /* FIXMEXXXX */
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| 57 |
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| 58 | /* Segment information for the a.out.Adobe format is specified after the
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| 59 | file header. It contains N segment descriptors, followed by one with
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| 60 | a type of zero.
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| 61 |
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| 62 | The actual text of the segments starts at N_TXTOFF in the file,
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| 63 | regardless of how many or how few segment headers there are. */
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| 64 |
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| 65 | struct external_segdesc {
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| 66 | unsigned char e_type[1];
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| 67 | unsigned char e_size[3];
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| 68 | unsigned char e_virtbase[4];
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| 69 | unsigned char e_filebase[4];
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| 70 | };
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| 71 |
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| 72 | struct internal_segdesc {
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| 73 | unsigned int a_type:8; /* Segment type N_TEXT, N_DATA, 0 */
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| 74 | unsigned int a_size:24; /* Segment size */
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| 75 | bfd_vma a_virtbase; /* Virtual address */
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| 76 | unsigned int a_filebase; /* Base address in object file */
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| 77 | };
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| 78 |
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| 79 | #define N_TXTADDR(x) \
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| 80 |
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| 81 | /* This is documented to be at 1024, but appears to really be at 2048.
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| 82 | FIXME?! */
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| 83 | #define N_TXTOFF(x) 2048
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| 84 |
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| 85 | #define N_TXTSIZE(x) ((x).a_text)
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| 86 |
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| 87 | #define N_DATADDR(x)
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| 88 |
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| 89 | #define N_BSSADDR(x)
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| 90 |
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| 91 | /* Offsets of the various portions of the file after the text segment. */
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| 92 |
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| 93 | #define N_DATOFF(x) ( N_TXTOFF(x) + N_TXTSIZE(x) )
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| 94 | #define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
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| 95 | #define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
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| 96 | #define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
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| 97 | #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
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| 98 | |
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| 99 |
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| 100 | /* Symbols */
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| 101 | struct external_nlist {
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| 102 | bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of name */
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| 103 | bfd_byte e_type[1]; /* type of symbol */
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| 104 | bfd_byte e_other[1]; /* misc info (usually empty) */
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| 105 | bfd_byte e_desc[2]; /* description field */
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| 106 | bfd_byte e_value[BYTES_IN_WORD]; /* value of symbol */
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| 107 | };
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| 108 |
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| 109 | #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
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| 110 |
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| 111 | struct internal_nlist {
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| 112 | unsigned long n_strx; /* index into string table of name */
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| 113 | unsigned char n_type; /* type of symbol */
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| 114 | unsigned char n_other; /* misc info (usually empty) */
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| 115 | unsigned short n_desc; /* description field */
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| 116 | bfd_vma n_value; /* value of symbol */
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| 117 | };
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| 118 |
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| 119 | /* The n_type field is the symbol type, containing: */
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| 120 |
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| 121 | #define N_UNDF 0 /* Undefined symbol */
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| 122 | #define N_ABS 2 /* Absolute symbol -- defined at particular addr */
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| 123 | #define N_TEXT 4 /* Text sym -- defined at offset in text seg */
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| 124 | #define N_DATA 6 /* Data sym -- defined at offset in data seg */
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| 125 | #define N_BSS 8 /* BSS sym -- defined at offset in zero'd seg */
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| 126 | #define N_COMM 0x12 /* Common symbol (visible after shared lib dynlink) */
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| 127 | #define N_FN 0x1f /* File name of .o file */
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| 128 | #define N_FN_SEQ 0x0C /* N_FN from Sequent compilers (sigh) */
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| 129 | /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT,
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| 130 | N_DATA, or N_BSS. When the low-order bit of other types is set,
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| 131 | (e.g. N_WARNING versus N_FN), they are two different types. */
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| 132 | #define N_EXT 1 /* External symbol (as opposed to local-to-this-file) */
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| 133 | #define N_TYPE 0x1e
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| 134 | #define N_STAB 0xe0 /* If any of these bits are on, it's a debug symbol */
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| 135 |
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| 136 | #define N_INDR 0x0a
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| 137 |
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| 138 | /* The following symbols refer to set elements.
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| 139 | All the N_SET[ATDB] symbols with the same name form one set.
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| 140 | Space is allocated for the set in the text section, and each set
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| 141 | elements value is stored into one word of the space.
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| 142 | The first word of the space is the length of the set (number of elements).
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| 143 |
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| 144 | The address of the set is made into an N_SETV symbol
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| 145 | whose name is the same as the name of the set.
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| 146 | This symbol acts like a N_DATA global symbol
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| 147 | in that it can satisfy undefined external references. */
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| 148 |
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| 149 | /* These appear as input to LD, in a .o file. */
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| 150 | #define N_SETA 0x14 /* Absolute set element symbol */
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| 151 | #define N_SETT 0x16 /* Text set element symbol */
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| 152 | #define N_SETD 0x18 /* Data set element symbol */
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| 153 | #define N_SETB 0x1A /* Bss set element symbol */
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| 154 |
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| 155 | /* This is output from LD. */
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| 156 | #define N_SETV 0x1C /* Pointer to set vector in data area. */
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| 157 |
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| 158 | /* Warning symbol. The text gives a warning message, the next symbol
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| 159 | in the table will be undefined. When the symbol is referenced, the
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| 160 | message is printed. */
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| 161 |
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| 162 | #define N_WARNING 0x1e
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| 163 |
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| 164 | /* Relocations
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| 165 |
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| 166 | There are two types of relocation flavours for a.out systems,
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| 167 | standard and extended. The standard form is used on systems where the
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| 168 | instruction has room for all the bits of an offset to the operand, whilst
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| 169 | the extended form is used when an address operand has to be split over n
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| 170 | instructions. Eg, on the 68k, each move instruction can reference
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| 171 | the target with a displacement of 16 or 32 bits. On the sparc, move
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| 172 | instructions use an offset of 14 bits, so the offset is stored in
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| 173 | the reloc field, and the data in the section is ignored.
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| 174 | */
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| 175 |
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| 176 | /* This structure describes a single relocation to be performed.
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| 177 | The text-relocation section of the file is a vector of these structures,
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| 178 | all of which apply to the text section.
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| 179 | Likewise, the data-relocation section applies to the data section. */
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| 180 |
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| 181 | struct reloc_std_external {
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| 182 | bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */
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| 183 | bfd_byte r_index[3]; /* symbol table index of symbol */
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| 184 | bfd_byte r_type[1]; /* relocation type */
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| 185 | };
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| 186 |
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| 187 | #define RELOC_STD_BITS_PCREL_BIG 0x80
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| 188 | #define RELOC_STD_BITS_PCREL_LITTLE 0x01
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| 189 |
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| 190 | #define RELOC_STD_BITS_LENGTH_BIG 0x60
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| 191 | #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
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| 192 | #define RELOC_STD_BITS_LENGTH_LITTLE 0x06
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| 193 | #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
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| 194 |
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| 195 | #define RELOC_STD_BITS_EXTERN_BIG 0x10
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| 196 | #define RELOC_STD_BITS_EXTERN_LITTLE 0x08
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| 197 |
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| 198 | #define RELOC_STD_BITS_BASEREL_BIG 0x08
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| 199 | #define RELOC_STD_BITS_BASEREL_LITTLE 0x08
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| 200 |
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| 201 | #define RELOC_STD_BITS_JMPTABLE_BIG 0x04
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| 202 | #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
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| 203 |
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| 204 | #define RELOC_STD_BITS_RELATIVE_BIG 0x02
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| 205 | #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
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| 206 |
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| 207 | #define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */
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| 208 |
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| 209 | struct reloc_std_internal
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| 210 | {
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| 211 | bfd_vma r_address; /* Address (within segment) to be relocated. */
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| 212 | /* The meaning of r_symbolnum depends on r_extern. */
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| 213 | unsigned int r_symbolnum:24;
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| 214 | /* Nonzero means value is a pc-relative offset
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| 215 | and it should be relocated for changes in its own address
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| 216 | as well as for changes in the symbol or section specified. */
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| 217 | unsigned int r_pcrel:1;
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| 218 | /* Length (as exponent of 2) of the field to be relocated.
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| 219 | Thus, a value of 2 indicates 1<<2 bytes. */
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| 220 | unsigned int r_length:2;
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| 221 | /* 1 => relocate with value of symbol.
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| 222 | r_symbolnum is the index of the symbol
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| 223 | in files the symbol table.
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| 224 | 0 => relocate with the address of a segment.
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| 225 | r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
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| 226 | (the N_EXT bit may be set also, but signifies nothing). */
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| 227 | unsigned int r_extern:1;
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| 228 | /* The next three bits are for SunOS shared libraries, and seem to
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| 229 | be undocumented. */
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| 230 | unsigned int r_baserel:1; /* Linkage table relative */
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| 231 | unsigned int r_jmptable:1; /* pc-relative to jump table */
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| 232 | unsigned int r_relative:1; /* "relative relocation" */
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| 233 | /* unused */
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| 234 | unsigned int r_pad:1; /* Padding -- set to zero */
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| 235 | };
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| 236 |
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| 237 |
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| 238 | /* EXTENDED RELOCS */
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| 239 |
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| 240 | struct reloc_ext_external {
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| 241 | bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */
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| 242 | bfd_byte r_index[3]; /* symbol table index of symbol */
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| 243 | bfd_byte r_type[1]; /* relocation type */
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| 244 | bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */
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| 245 | };
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| 246 |
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| 247 | #define RELOC_EXT_BITS_EXTERN_BIG 0x80
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| 248 | #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
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| 249 |
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| 250 | #define RELOC_EXT_BITS_TYPE_BIG 0x1F
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| 251 | #define RELOC_EXT_BITS_TYPE_SH_BIG 0
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| 252 | #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
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| 253 | #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
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| 254 |
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| 255 | /* Bytes per relocation entry */
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| 256 | #define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD)
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| 257 |
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| 258 | enum reloc_type
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| 259 | {
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| 260 | /* simple relocations */
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| 261 | RELOC_8, /* data[0:7] = addend + sv */
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| 262 | RELOC_16, /* data[0:15] = addend + sv */
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| 263 | RELOC_32, /* data[0:31] = addend + sv */
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| 264 | /* pc-rel displacement */
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| 265 | RELOC_DISP8, /* data[0:7] = addend - pc + sv */
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| 266 | RELOC_DISP16, /* data[0:15] = addend - pc + sv */
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| 267 | RELOC_DISP32, /* data[0:31] = addend - pc + sv */
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| 268 | /* Special */
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| 269 | RELOC_WDISP30, /* data[0:29] = (addend + sv - pc)>>2 */
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| 270 | RELOC_WDISP22, /* data[0:21] = (addend + sv - pc)>>2 */
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| 271 | RELOC_HI22, /* data[0:21] = (addend + sv)>>10 */
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| 272 | RELOC_22, /* data[0:21] = (addend + sv) */
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| 273 | RELOC_13, /* data[0:12] = (addend + sv) */
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| 274 | RELOC_LO10, /* data[0:9] = (addend + sv) */
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| 275 | RELOC_SFA_BASE,
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| 276 | RELOC_SFA_OFF13,
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| 277 | /* P.I.C. (base-relative) */
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| 278 | RELOC_BASE10, /* Not sure - maybe we can do this the */
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| 279 | RELOC_BASE13, /* right way now */
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| 280 | RELOC_BASE22,
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| 281 | /* for some sort of pc-rel P.I.C. (?) */
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| 282 | RELOC_PC10,
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| 283 | RELOC_PC22,
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| 284 | /* P.I.C. jump table */
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| 285 | RELOC_JMP_TBL,
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| 286 | /* reputedly for shared libraries somehow */
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| 287 | RELOC_SEGOFF16,
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| 288 | RELOC_GLOB_DAT,
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| 289 | RELOC_JMP_SLOT,
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| 290 | RELOC_RELATIVE,
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| 291 |
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| 292 | RELOC_11,
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| 293 | RELOC_WDISP2_14,
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| 294 | RELOC_WDISP19,
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| 295 | RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */
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| 296 | RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */
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| 297 |
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| 298 | /* 29K relocation types */
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| 299 | RELOC_JUMPTARG,
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| 300 | RELOC_CONST,
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| 301 | RELOC_CONSTH,
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| 302 |
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| 303 | NO_RELOC
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| 304 | };
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| 305 |
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| 306 |
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| 307 | struct reloc_internal {
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| 308 | bfd_vma r_address; /* offset of of data to relocate */
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| 309 | long r_index; /* symbol table index of symbol */
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| 310 | enum reloc_type r_type; /* relocation type */
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| 311 | bfd_vma r_addend; /* datum addend */
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| 312 | };
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| 313 |
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| 314 | #endif /* __A_OUT_ADOBE_H__ */
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