* aout64.h: Move struct internal_exec to ../bfd/libaout.h so
it can be shared by all `a.out-family' code. Rename EXTERNAL_LIST_SIZE to EXTERNAL_NLIST_SIZE. Use basic types for nlist members, and make strx integral rather than pointer. More commentary on n_type values.
This commit is contained in:
John Gilmore
parent
733ac8407d
commit
2d8ffde474
1 changed files with 30 additions and 107 deletions
137
include/aout64.h
137
include/aout64.h
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@ -1,8 +1,9 @@
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/* `a.out' object-file definitions, including extensions to 64-bit fields */
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#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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/* This is the layout on disk of the 32-bit or 64-bit exec header. */
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struct external_exec
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{
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@ -16,62 +17,8 @@ struct external_exec
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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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@ -131,58 +78,38 @@ enum machine_type {
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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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bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of 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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#define EXTERNAL_NLIST_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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unsigned long n_strx; /* index into string table of name */
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unsigned char n_type; /* type of symbol */
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unsigned char n_other; /* misc info (usually empty) */
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unsigned short 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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/* The n_type field is the symbol type, containing: */
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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_UNDF 0 /* Undefined symbol */
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#define N_ABS 2 /* Absolute symbol -- defined at particular addr */
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#define N_TEXT 4 /* Text sym -- defined at offset in text seg */
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#define N_DATA 6 /* Data sym -- defined at offset in data seg */
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#define N_BSS 8 /* BSS sym -- defined at offset in zero'd seg */
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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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/* Note: N_EXT can only be usefully 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_EXT 1 /* External symbol (as opposed to local-to-this-file) */
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#define N_TYPE 0x1e
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#define N_STAB 0xe0
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#define N_STAB 0xe0 /* If any of these bits are on, it's a debug symbol */
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#define N_INDR 0x0a
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@ -215,9 +142,9 @@ struct internal_nlist {
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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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standard and extended. The standard form is used on systems where the
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instruction has room for all the bits of an offset to the operand, whilst
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the 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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@ -303,15 +230,11 @@ struct reloc_ext_external {
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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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/* Bytes per relocation entry */
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#define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD)
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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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@ -387,4 +310,4 @@ struct reloc_internal {
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*/
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#endif /* __A_OUT_GNU_H__ */
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#endif /* __A_OUT_64_H__ */
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