d7f8f106b9
on the particular a.out being examined. * a.out.sun4.h: Define segment sizes for Sun-3's and Sun-4's. * FIXME: a.out.gnu.h is almost obsolete. * FIXME: a.out.sun4.h should be renamed a.out.sun.h now.
382 lines
12 KiB
C
Executable File
382 lines
12 KiB
C
Executable File
#ifndef __A_OUT_64_H__
|
|
#define __A_OUT_64_H__
|
|
|
|
|
|
/* This is the layout on disk of the 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)
|
|
|
|
/* This is the layout in memory of a "struct exec" while we process it. */
|
|
struct internal_exec
|
|
{
|
|
long a_info; /* Magic number and flags packed */
|
|
bfd_vma a_text; /* length of text, in bytes */
|
|
bfd_vma a_data; /* length of data, in bytes */
|
|
bfd_vma a_bss; /* length of uninitialized data area for file */
|
|
bfd_vma a_syms; /* length of symbol table data in file */
|
|
bfd_vma a_entry; /* start address */
|
|
bfd_vma a_trsize; /* length of relocation info for text, in bytes */
|
|
bfd_vma a_drsize; /* length of relocation info for data, in bytes */
|
|
};
|
|
|
|
|
|
/* Magic number is written
|
|
< MSB >
|
|
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
|
|
< FLAGS > < MACHINE TYPE > < MAGIC >
|
|
*/
|
|
enum machine_type {
|
|
M_UNKNOWN = 0,
|
|
M_68010 = 1,
|
|
M_68020 = 2,
|
|
M_SPARC = 3,
|
|
/* skip a bunch so we dont run into any of suns numbers */
|
|
M_386 = 100,
|
|
M_29K = 101,
|
|
M_NEWONE = 200,
|
|
M_NEWTWO = 201,
|
|
|
|
};
|
|
|
|
#define N_DYNAMIC(exec) ((exec).a_info & 0x8000000)
|
|
|
|
#define N_MAGIC(exec) ((exec).a_info & 0xffff)
|
|
#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
|
|
#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
|
|
#define N_SET_INFO(exec, magic, type, flags) \
|
|
((exec).a_info = ((magic) & 0xffff) \
|
|
| (((int)(type) & 0xff) << 16) \
|
|
| (((flags) & 0xff) << 24))
|
|
|
|
#define N_SET_MAGIC(exec, magic) \
|
|
((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
|
|
|
|
#define N_SET_MACHTYPE(exec, machtype) \
|
|
((exec).a_info = \
|
|
((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
|
|
|
|
#define N_SET_FLAGS(exec, flags) \
|
|
((exec).a_info = \
|
|
((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
|
|
|
|
/* By default, segment size is constant. But on some machines, it can
|
|
be a function of the a.out header (e.g. machine type). */
|
|
#ifndef N_SEGSIZE
|
|
#define N_SEGSIZE(x) SEGMENT_SIZE
|
|
#endif
|
|
|
|
#define _N_HDROFF(x) (N_SEGSIZE(x) - EXEC_BYTES_SIZE)
|
|
/* address in an a.out of the text section. When demand paged, it's
|
|
set up a bit to make nothing at 0, when an object file it's 0.
|
|
There's a special hack case when the entry point is < TEXT_START_ADDR
|
|
for executables, then the real start is 0
|
|
*/
|
|
|
|
#define N_TXTADDR(x) \
|
|
(N_MAGIC(x)==OMAGIC? 0 \
|
|
: (N_MAGIC(x) == ZMAGIC && (x).a_entry < TEXT_START_ADDR)? 0 \
|
|
: TEXT_START_ADDR)
|
|
|
|
/* offset in an a.out of the start of the text section. When demand
|
|
paged, this is the start of the file
|
|
*/
|
|
|
|
#define N_TXTOFF(x) ( (N_MAGIC((x)) == ZMAGIC) ? 0 : EXEC_BYTES_SIZE)
|
|
#if ARCH_SIZE==64
|
|
#define PAGE_SIZE 0x2000
|
|
#define OMAGIC 0x1001 /* Code indicating object file */
|
|
#define ZMAGIC 0x1002 /* Code indicating demand-paged executable. */
|
|
#define NMAGIC 0x1003 /* Code indicating pure executable. */
|
|
#else
|
|
#ifndef PAGE_SIZE
|
|
#define PAGE_SIZE 0x2000
|
|
#endif
|
|
#define OMAGIC 0407 /* Code indicating object file or impure executable. */
|
|
#define NMAGIC 0410 /* Code indicating pure executable. */
|
|
#define ZMAGIC 0413 /* Code indicating demand-paged executable. */
|
|
#endif
|
|
|
|
#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
|
|
&& N_MAGIC(x) != NMAGIC \
|
|
&& N_MAGIC(x) != ZMAGIC)
|
|
|
|
|
|
|
|
#define N_DATADDR(x) \
|
|
(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
|
|
: (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
|
|
|
|
#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
|
|
|
|
|
|
#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
|
|
#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 symbol 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_LIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
|
|
struct internal_nlist {
|
|
char *strx; /* index into string table of symbol name */
|
|
uint8_type n_type; /* type of symbol */
|
|
uint8_type n_other; /* misc info (usually empty) */
|
|
uint16_type n_desc; /* description field */
|
|
bfd_vma n_value; /* value of symbol */
|
|
};
|
|
|
|
/* The n_type field is packed :
|
|
|
|
7 6 5 4 3 2 1 0
|
|
^- if set the symbol is externaly visible
|
|
0 local
|
|
1 N_EXT external
|
|
^ ^ ^---- select which section the symbol belongs to
|
|
0 0 0 0 x N_UNDF, undefined
|
|
0 0 0 1 x N_ABS, no section, base at 0
|
|
0 0 1 0 x N_TEXT, text section
|
|
0 0 1 1 x N_DATA, data section
|
|
0 1 0 0 x N_BSS, bss section
|
|
^---------- if set the symbol is a set element
|
|
1 0 1 0 x N_SETA absolute set element symbol
|
|
1 0 1 1 x N_SETT text set element symbol
|
|
1 1 0 0 x N_SETD data set element symbol
|
|
1 1 0 1 x N_SETB bss set element symbol
|
|
1 1 1 0 x N_SETV pointer to set vector in data area
|
|
1 1 1 1 0 N_TYPE mask for all of the above
|
|
|
|
1 1 1 0 0 0 0 0 N_STAB type is a stab
|
|
*/
|
|
|
|
#define N_UNDF 0
|
|
#define N_ABS 2
|
|
#define N_TEXT 4
|
|
#define N_DATA 6
|
|
#define N_BSS 8
|
|
#define N_FN 15
|
|
#define N_EXT 1
|
|
#define N_TYPE 0x1e
|
|
#define N_STAB 0xe0
|
|
|
|
#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. */
|
|
|
|
|
|
/* 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 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 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
|
|
|
|
#define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) /* Bytes per relocation entry */
|
|
|
|
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,
|
|
|
|
/* All the new ones I can think of *//*v9*/
|
|
|
|
RELOC_64, /* data[0:63] = addend + sv *//*v9*/
|
|
RELOC_DISP64, /* data[0:63] = addend - pc + sv *//*v9*/
|
|
RELOC_WDISP21, /* data[0:20] = (addend + sv - pc)>>2 *//*v9*/
|
|
RELOC_DISP21, /* data[0:20] = addend - pc + sv *//*v9*/
|
|
RELOC_DISP14, /* data[0:13] = addend - pc + sv *//*v9*/
|
|
/* Q .
|
|
What are the other ones,
|
|
Since this is a clean slate, can we throw away the ones we dont
|
|
understand ? Should we sort the values ? What about using a
|
|
microcode format like the 68k ?
|
|
*/
|
|
NO_RELOC
|
|
};
|
|
|
|
|
|
struct reloc_internal {
|
|
bfd_vma r_address; /* offset of 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 */
|
|
};
|
|
|
|
/* Q.
|
|
Should the length of the string table be 4 bytes or 8 bytes ?
|
|
|
|
Q.
|
|
What about archive indexes ?
|
|
|
|
*/
|
|
|
|
#endif /* __A_OUT_GNU_H__ */
|