| /* `a.out.adobe' differences from standard a.out files |
| |
| Copyright (C) 2001-2017 Free Software Foundation, Inc. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #ifndef __A_OUT_ADOBE_H__ |
| #define __A_OUT_ADOBE_H__ |
| |
| #define BYTES_IN_WORD 4 |
| |
| /* Struct external_exec is the same. */ |
| |
| /* This is the layout on disk of the 32-bit or 64-bit exec header. */ |
| |
| struct external_exec |
| { |
| bfd_byte e_info[4]; /* Magic number and stuff. */ |
| bfd_byte e_text[BYTES_IN_WORD]; /* Length of text section in bytes. */ |
| bfd_byte e_data[BYTES_IN_WORD]; /* Length of data section in bytes. */ |
| bfd_byte e_bss[BYTES_IN_WORD]; /* Length of bss area in bytes. */ |
| bfd_byte e_syms[BYTES_IN_WORD]; /* Length of symbol table in bytes. */ |
| bfd_byte e_entry[BYTES_IN_WORD]; /* Start address. */ |
| bfd_byte e_trsize[BYTES_IN_WORD]; /* Length of text relocation info. */ |
| bfd_byte e_drsize[BYTES_IN_WORD]; /* Length of data relocation info. */ |
| }; |
| |
| #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7) |
| |
| /* Magic numbers for a.out files. */ |
| |
| #undef ZMAGIC |
| #define ZMAGIC 0xAD0BE /* Cute, eh? */ |
| #undef OMAGIC |
| #undef NMAGIC |
| |
| #define N_BADMAG(x) ((x)->a_info != ZMAGIC) |
| |
| /* By default, segment size is constant. But some machines override this |
| to be a function of the a.out header (e.g. machine type). */ |
| #ifndef N_SEGSIZE |
| #define N_SEGSIZE(x) SEGMENT_SIZE |
| #endif |
| #undef N_SEGSIZE /* FIXMEXXXX */ |
| |
| /* Segment information for the a.out.Adobe format is specified after the |
| file header. It contains N segment descriptors, followed by one with |
| a type of zero. |
| |
| The actual text of the segments starts at N_TXTOFF in the file, |
| regardless of how many or how few segment headers there are. */ |
| |
| struct external_segdesc |
| { |
| unsigned char e_type[1]; |
| unsigned char e_size[3]; |
| unsigned char e_virtbase[4]; |
| unsigned char e_filebase[4]; |
| }; |
| |
| struct internal_segdesc |
| { |
| unsigned int a_type:8; /* Segment type N_TEXT, N_DATA, 0. */ |
| unsigned int a_size:24; /* Segment size. */ |
| bfd_vma a_virtbase; /* Virtual address. */ |
| unsigned int a_filebase; /* Base address in object file. */ |
| }; |
| |
| #define N_TXTADDR(x) is_this_really_unused? |
| |
| /* This is documented to be at 1024, but appears to really be at 2048. |
| FIXME?! */ |
| #define N_TXTOFF(x) 2048 |
| |
| #define N_TXTSIZE(x) ((x)->a_text) |
| |
| #define N_DATADDR(x) is_this_really_unused? |
| |
| #define N_BSSADDR(x) is_this_really_unused? |
| |
| /* Offsets of the various portions of the file after the text segment. */ |
| |
| #define N_DATOFF(x) ( N_TXTOFF(x) + N_TXTSIZE(x) ) |
| #define N_TRELOFF(x) ( N_DATOFF(x) + (x)->a_data ) |
| #define N_DRELOFF(x) ( N_TRELOFF(x) + (x)->a_trsize ) |
| #define N_SYMOFF(x) ( N_DRELOFF(x) + (x)->a_drsize ) |
| #define N_STROFF(x) ( N_SYMOFF(x) + (x)->a_syms ) |
| |
| /* Symbols. */ |
| struct external_nlist |
| { |
| bfd_byte e_strx[BYTES_IN_WORD]; /* Index into string table of name. */ |
| bfd_byte e_type[1]; /* Type of symbol. */ |
| bfd_byte e_other[1]; /* Misc info (usually empty). */ |
| bfd_byte e_desc[2]; /* Description field. */ |
| bfd_byte e_value[BYTES_IN_WORD]; /* Value of symbol. */ |
| }; |
| |
| #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD) |
| |
| struct internal_nlist |
| { |
| unsigned long n_strx; /* Index into string table of name. */ |
| unsigned char n_type; /* Type of symbol. */ |
| unsigned char n_other; /* Misc info (usually empty). */ |
| unsigned short n_desc; /* Description field. */ |
| bfd_vma n_value; /* Value of symbol. */ |
| }; |
| |
| /* The n_type field is the symbol type, containing: */ |
| |
| #define N_UNDF 0 /* Undefined symbol. */ |
| #define N_ABS 2 /* Absolute symbol -- defined at particular addr. */ |
| #define N_TEXT 4 /* Text sym -- defined at offset in text seg. */ |
| #define N_DATA 6 /* Data sym -- defined at offset in data seg. */ |
| #define N_BSS 8 /* BSS sym -- defined at offset in zero'd seg. */ |
| #define N_COMM 0x12 /* Common symbol (visible after shared lib dynlink). */ |
| #define N_FN 0x1f /* File name of .o file. */ |
| #define N_FN_SEQ 0x0C /* N_FN from Sequent compilers (sigh). */ |
| /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT, |
| N_DATA, or N_BSS. When the low-order bit of other types is set, |
| (e.g. N_WARNING versus N_FN), they are two different types. */ |
| #define N_EXT 1 /* External symbol (as opposed to local-to-this-file). */ |
| #define N_TYPE 0x1e |
| #define N_STAB 0xe0 /* If any of these bits are on, it's a debug symbol. */ |
| |
| #define N_INDR 0x0a |
| |
| /* The following symbols refer to set elements. |
| All the N_SET[ATDB] symbols with the same name form one set. |
| Space is allocated for the set in the text section, and each set |
| elements value is stored into one word of the space. |
| The first word of the space is the length of the set (number of elements). |
| |
| The address of the set is made into an N_SETV symbol |
| whose name is the same as the name of the set. |
| This symbol acts like a N_DATA global symbol |
| in that it can satisfy undefined external references. */ |
| |
| /* These appear as input to LD, in a .o file. */ |
| #define N_SETA 0x14 /* Absolute set element symbol. */ |
| #define N_SETT 0x16 /* Text set element symbol. */ |
| #define N_SETD 0x18 /* Data set element symbol. */ |
| #define N_SETB 0x1A /* Bss set element symbol. */ |
| |
| /* This is output from LD. */ |
| #define N_SETV 0x1C /* Pointer to set vector in data area. */ |
| |
| /* Warning symbol. The text gives a warning message, the next symbol |
| in the table will be undefined. When the symbol is referenced, the |
| message is printed. */ |
| |
| #define N_WARNING 0x1e |
| |
| /* Relocations |
| |
| There are two types of relocation flavours for a.out systems, |
| standard and extended. The standard form is used on systems where the |
| instruction has room for all the bits of an offset to the operand, whilst |
| the extended form is used when an address operand has to be split over n |
| instructions. Eg, on the 68k, each move instruction can reference |
| the target with a displacement of 16 or 32 bits. On the sparc, move |
| instructions use an offset of 14 bits, so the offset is stored in |
| the reloc field, and the data in the section is ignored. */ |
| |
| /* This structure describes a single relocation to be performed. |
| The text-relocation section of the file is a vector of these structures, |
| all of which apply to the text section. |
| Likewise, the data-relocation section applies to the data section. */ |
| |
| struct reloc_std_external |
| { |
| bfd_byte r_address[BYTES_IN_WORD]; /* Offset of data to relocate. */ |
| bfd_byte r_index[3]; /* Symbol table index of symbol. */ |
| bfd_byte r_type[1]; /* Relocation type. */ |
| }; |
| |
| #define RELOC_STD_BITS_PCREL_BIG 0x80 |
| #define RELOC_STD_BITS_PCREL_LITTLE 0x01 |
| |
| #define RELOC_STD_BITS_LENGTH_BIG 0x60 |
| #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place. */ |
| #define RELOC_STD_BITS_LENGTH_LITTLE 0x06 |
| #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 |
| |
| #define RELOC_STD_BITS_EXTERN_BIG 0x10 |
| #define RELOC_STD_BITS_EXTERN_LITTLE 0x08 |
| |
| #define RELOC_STD_BITS_BASEREL_BIG 0x08 |
| #define RELOC_STD_BITS_BASEREL_LITTLE 0x08 |
| |
| #define RELOC_STD_BITS_JMPTABLE_BIG 0x04 |
| #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 |
| |
| #define RELOC_STD_BITS_RELATIVE_BIG 0x02 |
| #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 |
| |
| #define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry. */ |
| |
| struct reloc_std_internal |
| { |
| bfd_vma r_address; /* Address (within segment) to be relocated. */ |
| /* The meaning of r_symbolnum depends on r_extern. */ |
| unsigned int r_symbolnum:24; |
| /* Nonzero means value is a pc-relative offset |
| and it should be relocated for changes in its own address |
| as well as for changes in the symbol or section specified. */ |
| unsigned int r_pcrel:1; |
| /* Length (as exponent of 2) of the field to be relocated. |
| Thus, a value of 2 indicates 1<<2 bytes. */ |
| unsigned int r_length:2; |
| /* 1 => relocate with value of symbol. |
| r_symbolnum is the index of the symbol |
| in files the symbol table. |
| 0 => relocate with the address of a segment. |
| r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS |
| (the N_EXT bit may be set also, but signifies nothing). */ |
| unsigned int r_extern:1; |
| /* The next three bits are for SunOS shared libraries, and seem to |
| be undocumented. */ |
| unsigned int r_baserel:1; /* Linkage table relative. */ |
| unsigned int r_jmptable:1; /* pc-relative to jump table. */ |
| unsigned int r_relative:1; /* "relative relocation". */ |
| /* unused */ |
| unsigned int r_pad:1; /* Padding -- set to zero. */ |
| }; |
| |
| |
| /* EXTENDED RELOCS */ |
| |
| struct reloc_ext_external |
| { |
| bfd_byte r_address[BYTES_IN_WORD]; /* Offset of data to relocate. */ |
| bfd_byte r_index[3]; /* Symbol table index of symbol. */ |
| bfd_byte r_type[1]; /* Relocation type. */ |
| bfd_byte r_addend[BYTES_IN_WORD]; /* Datum addend. */ |
| }; |
| |
| #define RELOC_EXT_BITS_EXTERN_BIG 0x80 |
| #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 |
| |
| #define RELOC_EXT_BITS_TYPE_BIG 0x1F |
| #define RELOC_EXT_BITS_TYPE_SH_BIG 0 |
| #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 |
| #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 |
| |
| /* Bytes per relocation entry */ |
| #define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) |
| |
| enum reloc_type |
| { |
| /* Simple relocations. */ |
| RELOC_8, /* data[0:7] = addend + sv */ |
| RELOC_16, /* data[0:15] = addend + sv */ |
| RELOC_32, /* data[0:31] = addend + sv */ |
| /* PC-rel displacement. */ |
| RELOC_DISP8, /* data[0:7] = addend - pc + sv */ |
| RELOC_DISP16, /* data[0:15] = addend - pc + sv */ |
| RELOC_DISP32, /* data[0:31] = addend - pc + sv */ |
| /* Special. */ |
| RELOC_WDISP30, /* data[0:29] = (addend + sv - pc)>>2 */ |
| RELOC_WDISP22, /* data[0:21] = (addend + sv - pc)>>2 */ |
| RELOC_HI22, /* data[0:21] = (addend + sv)>>10 */ |
| RELOC_22, /* data[0:21] = (addend + sv) */ |
| RELOC_13, /* data[0:12] = (addend + sv) */ |
| RELOC_LO10, /* data[0:9] = (addend + sv) */ |
| RELOC_SFA_BASE, |
| RELOC_SFA_OFF13, |
| /* P.I.C. (base-relative). */ |
| RELOC_BASE10, /* Not sure - maybe we can do this the */ |
| RELOC_BASE13, /* right way now. */ |
| RELOC_BASE22, |
| /* For some sort of pc-rel P.I.C. (?) */ |
| RELOC_PC10, |
| RELOC_PC22, |
| /* P.I.C. jump table. */ |
| RELOC_JMP_TBL, |
| /* Reputedly for shared libraries somehow. */ |
| RELOC_SEGOFF16, |
| RELOC_GLOB_DAT, |
| RELOC_JMP_SLOT, |
| RELOC_RELATIVE, |
| |
| RELOC_11, |
| RELOC_WDISP2_14, |
| RELOC_WDISP19, |
| RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */ |
| RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */ |
| |
| /* 29K relocation types */ |
| RELOC_JUMPTARG, |
| RELOC_CONST, |
| RELOC_CONSTH, |
| |
| NO_RELOC |
| }; |
| |
| struct reloc_internal |
| { |
| bfd_vma r_address; /* Offset of data to relocate. */ |
| long r_index; /* Symbol table index of symbol. */ |
| enum reloc_type r_type; /* Relocation type. */ |
| bfd_vma r_addend; /* Datum addend. */ |
| }; |
| |
| #endif /* __A_OUT_ADOBE_H__ */ |