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author | K. Richard Pixley <rich@cygnus> | 1991-03-25 22:25:08 +0000 |
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committer | K. Richard Pixley <rich@cygnus> | 1991-03-25 22:25:08 +0000 |
commit | 61a153e5c167fceabc6fd145d7659efef2046d6d (patch) | |
tree | 7afa9e76e354085521c7105f1e6cf04652dfafd9 /gas/a.out.gnu.h | |
parent | fcd5c2934e7ce37a0e607b00cac4cf6a149b2b1e (diff) | |
download | gdb-61a153e5c167fceabc6fd145d7659efef2046d6d.zip gdb-61a153e5c167fceabc6fd145d7659efef2046d6d.tar.gz gdb-61a153e5c167fceabc6fd145d7659efef2046d6d.tar.bz2 |
as rich copied from mike
Diffstat (limited to 'gas/a.out.gnu.h')
-rwxr-xr-x | gas/a.out.gnu.h | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/gas/a.out.gnu.h b/gas/a.out.gnu.h new file mode 100755 index 0000000..a7f02a5 --- /dev/null +++ b/gas/a.out.gnu.h @@ -0,0 +1,461 @@ +#ifndef __A_OUT_GNU_H__ +#define __A_OUT_GNU_H__ + +#include "target.h" /* Figure out which target and host systems */ + +#define __GNU_EXEC_MACROS__ + +#ifndef __STRUCT_EXEC_OVERRIDE__ + +struct exec +{ + unsigned long a_info; /* Use macros N_MAGIC, etc for access */ + unsigned a_text; /* length of text, in bytes */ + unsigned a_data; /* length of data, in bytes */ + unsigned a_bss; /* length of uninitialized data area for file, in bytes */ + unsigned a_syms; /* length of symbol table data in file, in bytes */ + unsigned a_entry; /* start address */ + unsigned a_trsize; /* length of relocation info for text, in bytes */ + unsigned a_drsize; /* length of relocation info for data, in bytes */ +}; + +#endif /* __STRUCT_EXEC_OVERRIDE__ */ + +/* these go in the N_MACHTYPE field */ +/* These symbols could be defined by code from Suns...punt 'em */ +#undef M_OLDSUN2 +#undef M_68010 +#undef M_68020 +#undef M_SPARC +enum machine_type { + M_OLDSUN2 = 0, + M_68010 = 1, + M_68020 = 2, + M_SPARC = 3, + /* skip a bunch so we don't run into any of sun's numbers */ + M_386 = 100, + M_29K = 101, +}; + +#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)) + +/* Code indicating object file or impure executable. */ +#define OMAGIC 0407 +/* Code indicating pure executable. */ +#define NMAGIC 0410 +/* Code indicating demand-paged executable. */ +#define ZMAGIC 0413 + +#define N_BADMAG(x) \ + (N_MAGIC(x) != OMAGIC && N_MAGIC(x) != NMAGIC \ + && N_MAGIC(x) != ZMAGIC) + +#define _N_BADMAG(x) \ + (N_MAGIC(x) != OMAGIC && N_MAGIC(x) != NMAGIC \ + && N_MAGIC(x) != ZMAGIC) + +#define _N_HDROFF(x) (1024 - sizeof (struct exec)) + +#define N_TXTOFF(x) \ + (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : sizeof (struct exec)) + +#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) + +/* Address of text segment in memory after it is loaded. */ +/* Don't load things at zero, it encourages zero-pointer bugs */ +#ifndef TEXT_START_ADDR +#define TEXT_START_ADDR 0x10000 +#endif +#define N_TXTADDR(x) TEXT_START_ADDR + +/* Address of data segment in memory after it is loaded. + Note that it is up to you to define SEGMENT_SIZE + on machines not listed here. */ +#ifndef SEGMENT_SIZE +#if defined(vax) || defined(hp300) || defined(pyr) +#define SEGMENT_SIZE page_size +#endif +#ifdef sony +#define SEGMENT_SIZE 0x2000 +#endif /* Sony. */ +#ifdef is68k +#define SEGMENT_SIZE 0x20000 +#endif +#if defined(m68k) && defined(PORTAR) +#define PAGE_SIZE 0x400 +#define SEGMENT_SIZE PAGE_SIZE +#endif +#endif + +#define _N_SEGMENT_ROUND(x) (((x) + SEGMENT_SIZE - 1) & ~(SEGMENT_SIZE - 1)) + +#define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text) + +#ifndef N_DATADDR +#define N_DATADDR(x) \ + (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \ + : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x)))) +#endif + +/* Address of bss segment in memory after it is loaded. */ +#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data) + +struct nlist { + union { + char *n_name; + struct nlist *n_next; + long n_strx; + } n_un; + unsigned char n_type; + char n_other; + short n_desc; + unsigned long n_value; +}; + +#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 036 +#define N_STAB 0340 + +/* The following type indicates the definition of a symbol as being + an indirect reference to another symbol. The other symbol + appears as an undefined reference, immediately following this symbol. + + Indirection is asymmetrical. The other symbol's value will be used + to satisfy requests for the indirect symbol, but not vice versa. + If the other symbol does not have a definition, libraries will + be searched to find a definition. */ +#define N_INDR 0xa + +/* 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 + element's 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. */ + +/* 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. */ + +#if TARGET == TARGET_SPARC || TARGET == TARGET_AM29K +/* + * The following enum and struct were borrowed from + * sunOS /usr/include/sun4/a.out.h and extended to handle + * other machines. + */ + +enum reloc_type +{ + RELOC_8, RELOC_16, RELOC_32, RELOC_DISP8, + RELOC_DISP16, RELOC_DISP32, RELOC_WDISP30, RELOC_WDISP22, + RELOC_HI22, RELOC_22, RELOC_13, RELOC_LO10, + RELOC_SFA_BASE, RELOC_SFA_OFF13, RELOC_BASE10, RELOC_BASE13, + RELOC_BASE22, RELOC_PC10, RELOC_PC22, RELOC_JMP_TBL, + RELOC_SEGOFF16, RELOC_GLOB_DAT, RELOC_JMP_SLOT, RELOC_RELATIVE, + +/* 29K relocation types */ + RELOC_JUMPTARG, RELOC_CONST, RELOC_CONSTH, + + NO_RELOC +}; + +#define RELOC_TYPE_NAMES \ +"8", "16", "32", "DISP8", \ +"DISP16", "DISP32", "WDISP30", "WDISP22", \ +"HI22", "22", "13", "LO10", \ +"SFA_BASE", "SFAOFF13", "BASE10", "BASE13", \ +"BASE22", "PC10", "PC22", "JMP_TBL", \ +"SEGOFF16", "GLOB_DAT", "JMP_SLOT", "RELATIVE", \ +"JUMPTARG", "CONST", "CONSTH", \ +"NO_RELOC", \ +"XXX_28", "XXX_29", "XXX_30", "XXX_31" + +struct reloc_info_extended +{ + unsigned long r_address; + unsigned int r_index:24; +# define r_symbolnum r_index + unsigned r_extern:1; + unsigned :2; + enum reloc_type r_type:5; + long int r_addend; +}; + +/* Let programs know what they're dealing with */ +#define RELOC_EXTENDED 1 + +#undef relocation_info +#define relocation_info reloc_info_extended +#define RELOC_ADDRESS(r) ((r)->r_address) +#define RELOC_EXTERN_P(r) ((r)->r_extern) +#define RELOC_TYPE(r) ((r)->r_index) +#define RELOC_EXTENDED_TYPE(r) ((r)->r_type) +#define RELOC_SYMBOL(r) ((r)->r_index) +#define RELOC_MEMORY_SUB_P(r) 0 +#define RELOC_MEMORY_ADD_P(r) 0 +#define RELOC_ADD_EXTRA(r) ((r)->r_addend) +#define RELOC_PCREL_P(r) \ + ( ((r)->r_type >= RELOC_DISP8 && (r)->r_type <= RELOC_WDISP22) \ + || (r)->r_type == RELOC_JUMPTARG ) +#define RELOC_VALUE_RIGHTSHIFT(r) (reloc_target_rightshift[(r)->r_type]) +#define RELOC_TARGET_SIZE(r) (reloc_target_size[(r)->r_type]) +#define RELOC_TARGET_BITPOS(r) 0 +#define RELOC_TARGET_BITSIZE(r) (reloc_target_bitsize[(r)->r_type]) + +/* Note that these are very dependent on the order of the enums in + enum reloc_type (in a.out.h); if they change the following must be + changed */ +/* Also note that some of these may be incorrect; I have no information */ +#ifndef __STDC__ +#define const /**/ +#endif +static const int reloc_target_rightshift[] = { + 0, 0, 0, 0, + 0, 0, 2, 2, + 10, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 2, 0,16, /* 29K jumptarg, const, consth */ + 0, +}; +#define RELOC_SIZE_SPLIT16 13 +static const int reloc_target_size[] = { + 0, 1, 2, 0, + 1, 2, 2, 2, + 2, 2, 2, 2, + 2, 2, 2, 2, + 2, 2, 2, 2, + 2, 2, 2, 2, + RELOC_SIZE_SPLIT16, RELOC_SIZE_SPLIT16, RELOC_SIZE_SPLIT16, + 0, +}; +static const int reloc_target_bitsize[] = { + 8, 16, 32, 8, + 16, 32, 30, 22, + 22, 22, 13, 10, + 32, 32, 16, 0, + 0, 0, 0, 0, /* dunno */ + 0, 0, 0, 0, + 16, 16, 16, /* 29K jumptarg, const, consth */ + 0, +}; + +#define MAX_ALIGNMENT (sizeof (double)) + +#else /* Not SPARC or AM29K */ + +struct relocation_info +{ + /* Address (within segment) to be relocated. */ + int r_address; + /* 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 file's 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; + /* Four bits that aren't used, but when writing an object file + it is desirable to clear them. */ + unsigned int r_pad:4; +}; +#endif + +/* + * Ok. Following are the relocation information macros. If your + * system should not be able to use the default set (below), you must + * define the following: + + * relocation_info: This must be typedef'd (or #define'd) to the type + * of structure that is stored in the relocation info section of your + * a.out files. Often this is defined in the a.out.h for your system. + * + * RELOC_ADDRESS (rval): Offset into the current section of the + * <whatever> to be relocated. *Must be an lvalue*. + * + * RELOC_EXTERN_P (rval): Is this relocation entry based on an + * external symbol (1), or was it fully resolved upon entering the + * loader (0) in which case some combination of the value in memory + * (if RELOC_MEMORY_ADD_P) and the extra (if RELOC_ADD_EXTRA) contains + * what the value of the relocation actually was. *Must be an lvalue*. + * + * RELOC_TYPE (rval): If this entry was fully resolved upon + * entering the loader, what type should it be relocated as? + * + * RELOC_EXTENDED_TYPE (rval): If this entry is for a machine using + * extended relocatino, what type of field is it? (For example, on RISC + * machines, odd-sized displacements or split displacements occur.) + * + * RELOC_SYMBOL (rval): If this entry was not fully resolved upon + * entering the loader, what is the index of it's symbol in the symbol + * table? *Must be a lvalue*. + * + * RELOC_MEMORY_ADD_P (rval): This should return true if the final + * relocation value output here should be added to memory, or if the + * section of memory described should simply be set to the relocation + * value. + * + * RELOC_ADD_EXTRA (rval): (Optional) This macro, if defined, gives + * an extra value to be added to the relocation value based on the + * individual relocation entry. *Must be an lvalue if defined*. + * + * RELOC_PCREL_P (rval): True if the relocation value described is + * pc relative. + * + * RELOC_VALUE_RIGHTSHIFT (rval): Number of bits right to shift the + * final relocation value before putting it where it belongs. + * + * RELOC_TARGET_SIZE (rval): log to the base 2 of the number of + * bytes of size this relocation entry describes; 1 byte == 0; 2 bytes + * == 1; 4 bytes == 2, and etc. This is somewhat redundant (we could + * do everything in terms of the bit operators below), but having this + * macro could end up producing better code on machines without fancy + * bit twiddling. Also, it's easier to understand/code big/little + * endian distinctions with this macro. + * + * RELOC_TARGET_BITPOS (rval): The starting bit position within the + * object described in RELOC_TARGET_SIZE in which the relocation value + * will go. + * + * RELOC_TARGET_BITSIZE (rval): How many bits are to be replaced + * with the bits of the relocation value. It may be assumed by the + * code that the relocation value will fit into this many bits. This + * may be larger than RELOC_TARGET_SIZE if such be useful. + * + * + * Things I haven't implemented + * ---------------------------- + * + * Values for RELOC_TARGET_SIZE other than 0, 1, or 2. + * + * Pc relative relocation for External references. + */ +#if TARGET == TARGET_SEQUENT +#define RELOC_ADDRESS(r) ((r)->r_address) +#define RELOC_EXTERN_P(r) ((r)->r_extern) +#define RELOC_TYPE(r) ((r)->r_symbolnum) +#define RELOC_SYMBOL(r) ((r)->r_symbolnum) +#define RELOC_MEMORY_SUB_P(r) ((r)->r_bsr) +#define RELOC_MEMORY_ADD_P(r) 1 +#undef RELOC_ADD_EXTRA +#define RELOC_PCREL_P(r) ((r)->r_pcrel || (r)->r_bsr) +#define RELOC_VALUE_RIGHTSHIFT(r) 0 +#define RELOC_TARGET_SIZE(r) ((r)->r_length) +#define RELOC_TARGET_BITPOS(r) 0 +#define RELOC_TARGET_BITSIZE(r) 32 +#endif + +/* Default macros */ +#ifndef RELOC_ADDRESS +#define RELOC_ADDRESS(r) ((r)->r_address) +#define RELOC_EXTERN_P(r) ((r)->r_extern) +#define RELOC_TYPE(r) ((r)->r_symbolnum) +#define RELOC_SYMBOL(r) ((r)->r_symbolnum) +#define RELOC_MEMORY_SUB_P(r) 0 +#define RELOC_MEMORY_ADD_P(r) 1 +#undef RELOC_ADD_EXTRA +#define RELOC_PCREL_P(r) ((r)->r_pcrel) +#define RELOC_VALUE_RIGHTSHIFT(r) 0 +#define RELOC_TARGET_SIZE(r) ((r)->r_length) +#define RELOC_TARGET_BITPOS(r) 0 +#define RELOC_TARGET_BITSIZE(r) 32 +#endif + +/* Maximum alignment required of a common'd variable. If a var of this + size or larger is allocated in BSS when nobody defines it, it gets + this alignment. */ + +#ifndef MAX_ALIGNMENT +#define MAX_ALIGNMENT (sizeof (int)) +#endif + + +/* Definitions for routines that read and write GNU a.out files */ + +enum objfile_kind { + OBJFILE_ERROR, + OBJFILE_UNKNOWN, + OBJFILE_SINGLE, + OBJFILE_ARCHIVE, +}; + +enum objfile_kind read_aout_header(); /* (desc, &header) read&swap header */ + +/* Read an a.out header from DESC and call rel_fn(DESC, header) + if it is an object file, lib_fn(DESC) if it is a library, else + call err_fn("msg") */ +void handle_aout_header(); /* (desc, rel_fn, lib_fn, err_fn) */ + +/* Byte-swapping definitions */ + +void swap_aoutheader(); /* BSD a.out header */ +short swap_getshort (); +void swap_putshort(); +long swap_getlong (); +void swap_putlong(); +void swap_reloc_info_in(); /* BSD relocation information */ +void swap_reloc_info_out(); /* BSD relocation information */ +void swap_nlists(); /* BSD symbol name lists */ +void swap_root_updates(); /* GDB Symseg */ + +/* Bring on the encapsulation, if configured in! */ +#ifdef COFF_ENCAPSULATE +#include "a.out.encap.h" +#endif + +#endif /* __A_OUT_GNU_H__ */ |