1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
388 lines
12 KiB
C
388 lines
12 KiB
C
/*
|
|
* $FreeBSD$
|
|
*/
|
|
/*-
|
|
* This code is derived from software copyrighted by the Free Software
|
|
* Foundation.
|
|
*
|
|
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
|
|
*/
|
|
|
|
#define SUN_COMPAT
|
|
|
|
#ifndef N_SIZE
|
|
#define N_SIZE 0xc
|
|
#endif
|
|
|
|
#ifndef min
|
|
#define min(a,b) ((a) < (b) ? (a) : (b))
|
|
#endif
|
|
|
|
#ifndef __P
|
|
#ifndef __STDC__
|
|
#define __P(a) ()
|
|
#else
|
|
#define __P(a) a
|
|
#endif
|
|
#endif
|
|
|
|
/* If compiled with GNU C, use the built-in alloca */
|
|
#if defined(__GNUC__) || defined(sparc)
|
|
#define alloca __builtin_alloca
|
|
#endif
|
|
|
|
#include "md.h"
|
|
#include "link.h"
|
|
|
|
/* Macro to control the number of undefined references printed */
|
|
#define MAX_UREFS_PRINTED 10
|
|
|
|
/* Align to power-of-two boundary */
|
|
#define PALIGN(x,p) (((x) + (u_long)(p) - 1) & (-(u_long)(p)))
|
|
|
|
/* Align to machine dependent boundary */
|
|
#define MALIGN(x) PALIGN(x,MAX_ALIGNMENT)
|
|
|
|
/* Define this to specify the default executable format. */
|
|
#ifndef DEFAULT_MAGIC
|
|
#ifdef __FreeBSD__
|
|
#define DEFAULT_MAGIC QMAGIC
|
|
extern int netzmagic;
|
|
#else
|
|
#define DEFAULT_MAGIC ZMAGIC
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef DEMANGLE_CPLUSPLUS
|
|
extern char *demangle __P((char*));
|
|
#else
|
|
#define demangle(name) name
|
|
#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_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.
|
|
*
|
|
*
|
|
*/
|
|
|
|
|
|
/* 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
|
|
#if defined(RTLD) && defined(SUN_COMPAT)
|
|
#define RELOC_TARGET_SIZE(r) (2) /* !!!!! Sun BUG compatible */
|
|
#else
|
|
#define RELOC_TARGET_SIZE(r) ((r)->r_length)
|
|
#endif
|
|
#define RELOC_TARGET_BITPOS(r) 0
|
|
#define RELOC_TARGET_BITSIZE(r) 32
|
|
|
|
#endif
|
|
|
|
#ifdef nounderscore
|
|
#define LPREFIX '.'
|
|
#else
|
|
#define LPREFIX 'L'
|
|
#endif
|
|
|
|
#ifndef TEXT_START
|
|
#define TEXT_START(x) N_TXTADDR(x)
|
|
#endif
|
|
|
|
#ifndef DATA_START
|
|
#define DATA_START(x) N_DATADDR(x)
|
|
#endif
|
|
|
|
/* If a this type of symbol is encountered, its name is a warning
|
|
message to print each time the symbol referenced by the next symbol
|
|
table entry is referenced.
|
|
|
|
This feature may be used to allow backwards compatibility with
|
|
certain functions (eg. gets) but to discourage programmers from
|
|
their use.
|
|
|
|
So if, for example, you wanted to have ld print a warning whenever
|
|
the function "gets" was used in their C program, you would add the
|
|
following to the assembler file in which gets is defined:
|
|
|
|
.stabs "Obsolete function \"gets\" referenced",30,0,0,0
|
|
.stabs "_gets",1,0,0,0
|
|
|
|
These .stabs do not necessarily have to be in the same file as the
|
|
gets function, they simply must exist somewhere in the compilation. */
|
|
|
|
#ifndef N_WARNING
|
|
#define N_WARNING 0x1E /* Warning message to print if symbol
|
|
included */
|
|
#endif /* This is input to ld */
|
|
|
|
/* Special global symbol types understood by GNU LD. */
|
|
|
|
/* 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.
|
|
|
|
So, for example, the following two lines placed in an assembler
|
|
input file would result in an object file which would direct gnu ld
|
|
to resolve all references to symbol "foo" as references to symbol
|
|
"bar".
|
|
|
|
.stabs "_foo",11,0,0,0
|
|
.stabs "_bar",1,0,0,0
|
|
|
|
Note that (11 == (N_INDR | N_EXT)) and (1 == (N_UNDF | N_EXT)). */
|
|
|
|
#ifndef N_INDR
|
|
#define N_INDR 0xa
|
|
#endif
|
|
|
|
/* The following symbols refer to set elements. These are expected
|
|
only in input to the loader; they should not appear in loader
|
|
output (unless relocatable output is requested). To be recognized
|
|
by the loader, the input symbols must have their N_EXT bit set.
|
|
All the N_SET[ATDB] symbols with the same name form one set. The
|
|
loader collects all of these elements at load time and outputs a
|
|
vector for each name.
|
|
Space (an array of 32 bit words) is allocated for the set in the
|
|
data section, and the n_value field of each set element value is
|
|
stored into one word of the array.
|
|
The first word of the array is the length of the set (number of
|
|
elements). The last word of the vector is set to zero for possible
|
|
use by incremental loaders. The array is ordered by the linkage
|
|
order; the first symbols which the linker encounters will be first
|
|
in the array.
|
|
|
|
In C syntax this looks like:
|
|
|
|
struct set_vector {
|
|
unsigned int length;
|
|
unsigned int vector[length];
|
|
unsigned int always_zero;
|
|
};
|
|
|
|
Before being placed into the array, each element is relocated
|
|
according to its type. This allows the loader to create an array
|
|
of pointers to objects automatically. N_SETA type symbols will not
|
|
be relocated.
|
|
|
|
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.
|
|
|
|
For the purposes of determining whether or not to load in a library
|
|
file, set element definitions are not considered "real
|
|
definitions"; they will not cause the loading of a library
|
|
member.
|
|
|
|
If relocatable output is requested, none of this processing is
|
|
done. The symbols are simply relocated and passed through to the
|
|
output file.
|
|
|
|
So, for example, the following three lines of assembler code
|
|
(whether in one file or scattered between several different ones)
|
|
will produce a three element vector (total length is five words;
|
|
see above), referenced by the symbol "_xyzzy", which will have the
|
|
addresses of the routines _init1, _init2, and _init3.
|
|
|
|
*NOTE*: If symbolic addresses are used in the n_value field of the
|
|
defining .stabs, those symbols must be defined in the same file as
|
|
that containing the .stabs.
|
|
|
|
.stabs "_xyzzy",23,0,0,_init1
|
|
.stabs "_xyzzy",23,0,0,_init2
|
|
.stabs "_xyzzy",23,0,0,_init3
|
|
|
|
Note that (23 == (N_SETT | N_EXT)). */
|
|
|
|
#ifndef N_SETA
|
|
#define N_SETA 0x14 /* Absolute set element symbol */
|
|
#endif /* This is input to LD, in a .o file. */
|
|
|
|
#ifndef N_SETT
|
|
#define N_SETT 0x16 /* Text set element symbol */
|
|
#endif /* This is input to LD, in a .o file. */
|
|
|
|
#ifndef N_SETD
|
|
#define N_SETD 0x18 /* Data set element symbol */
|
|
#endif /* This is input to LD, in a .o file. */
|
|
|
|
#ifndef N_SETB
|
|
#define N_SETB 0x1A /* Bss set element symbol */
|
|
#endif /* This is input to LD, in a .o file. */
|
|
|
|
/* Macros dealing with the set element symbols defined in a.out.h */
|
|
#define SET_ELEMENT_P(x) ((x) >= N_SETA && (x) <= (N_SETB|N_EXT))
|
|
#define TYPE_OF_SET_ELEMENT(x) ((x) - N_SETA + N_ABS)
|
|
|
|
#ifndef N_SETV
|
|
#define N_SETV 0x1C /* Pointer to set vector in data area. */
|
|
#endif /* This is output from LD. */
|
|
|
|
|
|
#ifndef __GNU_STAB__
|
|
/* Line number for the data section. This is to be used to describe
|
|
the source location of a variable declaration. */
|
|
#ifndef N_DSLINE
|
|
#define N_DSLINE (N_SLINE+N_DATA-N_TEXT)
|
|
#endif
|
|
|
|
/* Line number for the bss section. This is to be used to describe
|
|
the source location of a variable declaration. */
|
|
#ifndef N_BSLINE
|
|
#define N_BSLINE (N_SLINE+N_BSS-N_TEXT)
|
|
#endif
|
|
#endif /* not __GNU_STAB__ */
|
|
|
|
|
|
/* Number of buckets in symbol hash table */
|
|
#define SYMTABSIZE 1009
|
|
|
|
/* # of global symbols referenced and not defined. */
|
|
extern int undefined_global_sym_count;
|
|
|
|
/* # of weak symbols referenced and not defined. */
|
|
extern int undefined_weak_sym_count;
|
|
|
|
/* # of undefined symbols referenced by shared objects */
|
|
extern int undefined_shobj_sym_count;
|
|
|
|
/* # of multiply defined symbols. */
|
|
extern int multiple_def_count;
|
|
|
|
/* # of common symbols. */
|
|
extern int common_defined_global_count;
|
|
|
|
/* # of warning symbols encountered. */
|
|
extern int warn_sym_count;
|
|
extern int list_warning_symbols;
|
|
|
|
/*
|
|
* Define a linked list of strings which define symbols which should be
|
|
* treated as set elements even though they aren't. Any symbol with a prefix
|
|
* matching one of these should be treated as a set element.
|
|
*
|
|
* This is to make up for deficiencies in many assemblers which aren't willing
|
|
* to pass any stabs through to the loader which they don't understand.
|
|
*/
|
|
struct string_list_element {
|
|
char *str;
|
|
struct string_list_element *next;
|
|
};
|
|
|
|
struct glosym;
|
|
#ifndef __symbol_defined__
|
|
#define __symbol_defined__
|
|
typedef struct glosym symbol;
|
|
#endif
|
|
|
|
extern symbol *entry_symbol; /* the entry symbol, if any */
|
|
extern symbol *edata_symbol; /* the symbol _edata */
|
|
extern symbol *etext_symbol; /* the symbol _etext */
|
|
extern symbol *end_symbol; /* the symbol _end */
|
|
|
|
/*
|
|
* Section start addresses.
|
|
*/
|
|
extern int text_size; /* total size of text. */
|
|
extern int text_start; /* start of text */
|
|
extern int text_pad; /* clear space between text and data */
|
|
extern int data_size; /* total size of data. */
|
|
extern int data_start; /* start of data */
|
|
extern int data_pad; /* part of bss segment within data */
|
|
|
|
extern int bss_size; /* total size of bss. */
|
|
extern int bss_start; /* start of bss */
|
|
|
|
extern int text_reloc_size; /* total size of text relocation. */
|
|
extern int data_reloc_size; /* total size of data relocation. */
|
|
|
|
extern int magic; /* Output file magic. */
|
|
extern int relocatable_output;
|
|
|
|
/* Size of a page. */
|
|
extern int page_size;
|
|
|
|
extern char **search_dirs; /* Directories to search for libraries. */
|
|
extern int n_search_dirs; /* Length of above. */
|
|
|
|
extern int write_map; /* write a load map (`-M') */
|
|
|
|
#include "dynamic.h"
|