--- /dev/null
+#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))
+
+#define _N_HDROFF(x) (SEGMENT_SIZE - 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) \
+ : (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-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
+
+/* 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,
+ /* 29K relocation types */
+ RELOC_JUMPTARG,
+ RELOC_CONST,
+ RELOC_CONSTH,
+
+ /* All the new ones I can think of */
+
+ RELOC_64, /* data[0:63] = addend + sv */
+ RELOC_DISP64, /* data[0:63] = addend - pc + sv */
+ RELOC_WDISP21, /* data[0:20] = (addend + sv - pc)>>2 */
+ RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */
+ RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */
+ RELOC_DISP21, /* data[0:20] = addend - pc + sv */
+ RELOC_DISP14, /* data[0:13] = addend - pc + sv */
+ /* 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__ */
projects / deliverable / binutils-gdb.git / commitdiff
