391 lines
13 KiB
C
Executable File
391 lines
13 KiB
C
Executable File
#ifndef __A_OUT_64_H__
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#define __A_OUT_64_H__
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/* This is the layout on disk of the 64 bit exec header. */
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struct external_exec
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{
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bfd_byte e_info[4]; /* magic number and stuff */
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bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes */
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bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes */
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bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes */
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bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes */
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bfd_byte e_entry[BYTES_IN_WORD]; /* start address */
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bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info */
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bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info */
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};
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#define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7)
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/* This is the layout in memory of a "struct exec" while we process it. */
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struct internal_exec
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{
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long a_info; /* Magic number and flags packed */
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bfd_vma a_text; /* length of text, in bytes */
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bfd_vma a_data; /* length of data, in bytes */
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bfd_vma a_bss; /* length of uninitialized data area for file */
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bfd_vma a_syms; /* length of symbol table data in file */
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bfd_vma a_entry; /* start address */
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bfd_vma a_trsize; /* length of relocation info for text, in bytes */
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bfd_vma a_drsize; /* length of relocation info for data, in bytes */
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};
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/* Magic number is written
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< MSB >
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31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
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< FLAGS > < MACHINE TYPE > < MAGIC >
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*/
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enum machine_type {
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M_UNKNOWN = 0,
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M_68010 = 1,
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M_68020 = 2,
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M_SPARC = 3,
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/* skip a bunch so we dont run into any of suns numbers */
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M_386 = 100,
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M_29K = 101,
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M_NEWONE = 200,
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M_NEWTWO = 201,
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};
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#define N_DYNAMIC(exec) ((exec).a_info & 0x8000000)
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#define N_MAGIC(exec) ((exec).a_info & 0xffff)
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#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
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#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
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#define N_SET_INFO(exec, magic, type, flags) \
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((exec).a_info = ((magic) & 0xffff) \
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| (((int)(type) & 0xff) << 16) \
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| (((flags) & 0xff) << 24))
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#define N_SET_MAGIC(exec, magic) \
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((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
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#define N_SET_MACHTYPE(exec, machtype) \
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((exec).a_info = \
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((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
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#define N_SET_FLAGS(exec, flags) \
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((exec).a_info = \
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((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
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/* By default, segment size is constant. But on some machines, it can
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be a function of the a.out header (e.g. machine type). */
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#ifndef N_SEGSIZE
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#define N_SEGSIZE(x) SEGMENT_SIZE
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#endif
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#define _N_HDROFF(x) (N_SEGSIZE(x) - EXEC_BYTES_SIZE)
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/* address in an a.out of the text section. When demand paged, it's
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set up a bit to make nothing at 0, when an object file it's 0.
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There's a special hack case when the entry point is < TEXT_START_ADDR
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for executables, then the real start is 0
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*/
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#define N_TXTADDR(x) \
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(N_MAGIC(x)==OMAGIC? 0 \
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: (N_MAGIC(x) == ZMAGIC && (x).a_entry < TEXT_START_ADDR)? 0 \
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: TEXT_START_ADDR)
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/* offset in an a.out of the start of the text section. When demand
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paged, this is the start of the file
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*/
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#define N_TXTOFF(x) ( (N_MAGIC((x)) == ZMAGIC) ? 0 : EXEC_BYTES_SIZE)
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#if ARCH_SIZE==64
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#define PAGE_SIZE 0x2000
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#define OMAGIC 0x1001 /* Code indicating object file */
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#define ZMAGIC 0x1002 /* Code indicating demand-paged executable. */
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#define NMAGIC 0x1003 /* Code indicating pure executable. */
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#else
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#ifndef PAGE_SIZE
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#define PAGE_SIZE 0x2000
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#endif
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#define OMAGIC 0407 /* Code indicating object file or impure executable. */
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#define NMAGIC 0410 /* Code indicating pure executable. */
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#define ZMAGIC 0413 /* Code indicating demand-paged executable. */
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#endif
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#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
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&& N_MAGIC(x) != NMAGIC \
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&& N_MAGIC(x) != ZMAGIC)
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#define N_DATADDR(x) \
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(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
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: (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
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#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
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#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
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#define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
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#define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
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#define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
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#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
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/* Symbols */
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struct external_nlist {
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bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of symbol name */
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bfd_byte e_type[1]; /* type of symbol */
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bfd_byte e_other[1]; /* misc info (usually empty) */
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bfd_byte e_desc[2]; /* description field */
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bfd_byte e_value[BYTES_IN_WORD];/* value of symbol */
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};
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#define EXTERNAL_LIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
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struct internal_nlist {
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char *strx; /* index into string table of symbol name */
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uint8_type n_type; /* type of symbol */
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uint8_type n_other; /* misc info (usually empty) */
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uint16_type n_desc; /* description field */
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bfd_vma n_value; /* value of symbol */
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};
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/* The n_type field is packed :
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7 6 5 4 3 2 1 0
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^- if set the symbol is externaly visible
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0 local
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1 N_EXT external
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^ ^ ^---- select which section the symbol belongs to
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0 0 0 0 x N_UNDF, undefined
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0 0 0 1 x N_ABS, no section, base at 0
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0 0 1 0 x N_TEXT, text section
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0 0 1 1 x N_DATA, data section
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0 1 0 0 x N_BSS, bss section
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^---------- if set the symbol is a set element
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1 0 1 0 x N_SETA absolute set element symbol
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1 0 1 1 x N_SETT text set element symbol
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1 1 0 0 x N_SETD data set element symbol
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1 1 0 1 x N_SETB bss set element symbol
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1 1 1 0 x N_SETV pointer to set vector in data area
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1 1 1 1 0 N_TYPE mask for all of the above
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1 1 1 0 0 0 0 0 N_STAB type is a stab
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*/
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#define N_UNDF 0
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#define N_ABS 2
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#define N_TEXT 4
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#define N_DATA 6
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#define N_BSS 8
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#define N_COMM 0x12 /* Common symbol (visible after shared lib dynlink) */
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#define N_FN 0x1f /* File name of .o file */
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/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
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N_DATA, or N_BSS. When the low-order bit of other types is set,
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(e.g. N_WARNING versus N_FN), they are two different types. */
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#define N_EXT 1
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#define N_TYPE 0x1e
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#define N_STAB 0xe0
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#define N_INDR 0x0a
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/* The following symbols refer to set elements.
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All the N_SET[ATDB] symbols with the same name form one set.
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Space is allocated for the set in the text section, and each set
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elements value is stored into one word of the space.
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The first word of the space is the length of the set (number of elements).
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The address of the set is made into an N_SETV symbol
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whose name is the same as the name of the set.
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This symbol acts like a N_DATA global symbol
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in that it can satisfy undefined external references. */
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/* These appear as input to LD, in a .o file. */
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#define N_SETA 0x14 /* Absolute set element symbol */
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#define N_SETT 0x16 /* Text set element symbol */
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#define N_SETD 0x18 /* Data set element symbol */
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#define N_SETB 0x1A /* Bss set element symbol */
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/* This is output from LD. */
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#define N_SETV 0x1C /* Pointer to set vector in data area. */
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/* Warning symbol. The text gives a warning message, the next symbol
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in the table will be undefined. When the symbol is referenced, the
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message is printed. */
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#define N_WARNING 0x1e
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/* Relocations
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There are two types of relocation flavours for a.out systems,
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standard and extended. The standard form is used on systems where
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the instruction has room for all the bits of an offset to the operand, whilst the
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extended form is used when an address operand has to be split over n
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instructions. Eg, on the 68k, each move instruction can reference
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the target with a displacement of 16 or 32 bits. On the sparc, move
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instructions use an offset of 14 bits, so the offset is stored in
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the reloc field, and the data in the section is ignored.
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*/
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/* This structure describes a single relocation to be performed.
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The text-relocation section of the file is a vector of these structures,
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all of which apply to the text section.
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Likewise, the data-relocation section applies to the data section. */
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struct reloc_std_external {
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bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */
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bfd_byte r_index[3]; /* symbol table index of symbol */
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bfd_byte r_type[1]; /* relocation type */
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};
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#define RELOC_STD_BITS_PCREL_BIG 0x80
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#define RELOC_STD_BITS_PCREL_LITTLE 0x01
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#define RELOC_STD_BITS_LENGTH_BIG 0x60
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#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
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#define RELOC_STD_BITS_LENGTH_LITTLE 0x06
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#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
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#define RELOC_STD_BITS_EXTERN_BIG 0x10
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#define RELOC_STD_BITS_EXTERN_LITTLE 0x08
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#define RELOC_STD_BITS_BASEREL_BIG 0x08
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#define RELOC_STD_BITS_BASEREL_LITTLE 0x08
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#define RELOC_STD_BITS_JMPTABLE_BIG 0x04
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#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
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#define RELOC_STD_BITS_RELATIVE_BIG 0x02
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#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
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#define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */
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struct reloc_std_internal
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{
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bfd_vma r_address; /* Address (within segment) to be relocated. */
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/* The meaning of r_symbolnum depends on r_extern. */
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unsigned int r_symbolnum:24;
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/* Nonzero means value is a pc-relative offset
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and it should be relocated for changes in its own address
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as well as for changes in the symbol or section specified. */
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unsigned int r_pcrel:1;
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/* Length (as exponent of 2) of the field to be relocated.
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Thus, a value of 2 indicates 1<<2 bytes. */
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unsigned int r_length:2;
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/* 1 => relocate with value of symbol.
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r_symbolnum is the index of the symbol
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in files the symbol table.
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0 => relocate with the address of a segment.
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r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
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(the N_EXT bit may be set also, but signifies nothing). */
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unsigned int r_extern:1;
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/* The next three bits are for SunOS shared libraries, and seem to
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be undocumented. */
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unsigned int r_baserel:1; /* Linkage table relative */
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unsigned int r_jmptable:1; /* pc-relative to jump table */
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unsigned int r_relative:1; /* "relative relocation" */
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/* unused */
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unsigned int r_pad:1; /* Padding -- set to zero */
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};
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/* EXTENDED RELOCS */
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struct reloc_ext_external {
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bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */
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bfd_byte r_index[3]; /* symbol table index of symbol */
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bfd_byte r_type[1]; /* relocation type */
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bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */
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};
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#define RELOC_EXT_BITS_EXTERN_BIG 0x80
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#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
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#define RELOC_EXT_BITS_TYPE_BIG 0x1F
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#define RELOC_EXT_BITS_TYPE_SH_BIG 0
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#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
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#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
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#define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) /* Bytes per relocation entry */
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enum reloc_type
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{
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/* simple relocations */
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RELOC_8, /* data[0:7] = addend + sv */
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RELOC_16, /* data[0:15] = addend + sv */
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RELOC_32, /* data[0:31] = addend + sv */
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/* pc-rel displacement */
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RELOC_DISP8, /* data[0:7] = addend - pc + sv */
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RELOC_DISP16, /* data[0:15] = addend - pc + sv */
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RELOC_DISP32, /* data[0:31] = addend - pc + sv */
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/* Special */
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RELOC_WDISP30, /* data[0:29] = (addend + sv - pc)>>2 */
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RELOC_WDISP22, /* data[0:21] = (addend + sv - pc)>>2 */
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RELOC_HI22, /* data[0:21] = (addend + sv)>>10 */
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RELOC_22, /* data[0:21] = (addend + sv) */
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RELOC_13, /* data[0:12] = (addend + sv) */
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RELOC_LO10, /* data[0:9] = (addend + sv) */
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RELOC_SFA_BASE,
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RELOC_SFA_OFF13,
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/* P.I.C. (base-relative) */
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RELOC_BASE10, /* Not sure - maybe we can do this the */
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RELOC_BASE13, /* right way now */
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RELOC_BASE22,
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/* for some sort of pc-rel P.I.C. (?) */
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RELOC_PC10,
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RELOC_PC22,
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/* P.I.C. jump table */
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RELOC_JMP_TBL,
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/* reputedly for shared libraries somehow */
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RELOC_SEGOFF16,
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RELOC_GLOB_DAT,
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RELOC_JMP_SLOT,
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RELOC_RELATIVE,
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RELOC_11,
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RELOC_WDISP2_14,
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RELOC_WDISP19,
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RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */
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RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */
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/* 29K relocation types */
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RELOC_JUMPTARG,
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RELOC_CONST,
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RELOC_CONSTH,
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/* All the new ones I can think of *//*v9*/
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RELOC_64, /* data[0:63] = addend + sv *//*v9*/
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RELOC_DISP64, /* data[0:63] = addend - pc + sv *//*v9*/
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RELOC_WDISP21, /* data[0:20] = (addend + sv - pc)>>2 *//*v9*/
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RELOC_DISP21, /* data[0:20] = addend - pc + sv *//*v9*/
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RELOC_DISP14, /* data[0:13] = addend - pc + sv *//*v9*/
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/* Q .
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What are the other ones,
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Since this is a clean slate, can we throw away the ones we dont
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understand ? Should we sort the values ? What about using a
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microcode format like the 68k ?
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*/
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NO_RELOC
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};
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struct reloc_internal {
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bfd_vma r_address; /* offset of of data to relocate */
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long r_index; /* symbol table index of symbol */
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enum reloc_type r_type; /* relocation type */
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bfd_vma r_addend; /* datum addend */
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};
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/* Q.
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Should the length of the string table be 4 bytes or 8 bytes ?
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Q.
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What about archive indexes ?
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*/
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#endif /* __A_OUT_GNU_H__ */
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