mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-05 08:14:19 +08:00
fefb4b30e6
* archures.c, reloc.c, section.c, tekhex.c: Use PARAMS in declaring pointers to functions. * cache.c, elf.c: Move static function decls to top, use PARAMS. * seclet.h: Declare external function with PARAMS. * libbfd.h: Update, based on changes in source code and chew.
941 lines
25 KiB
C
941 lines
25 KiB
C
/* BFD support for handling relocation entries.
|
|
Copyright (C) 1990-1991 Free Software Foundation, Inc.
|
|
Written by Cygnus Support.
|
|
|
|
This file is part of BFD, the Binary File Descriptor library.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
SECTION
|
|
Relocations
|
|
|
|
BFD maintains relocations in much the same was as it maintains
|
|
symbols; they are left alone until required, then read in
|
|
en-mass and traslated into an internal form. There is a common
|
|
routine <<bfd_perform_relocation>> which acts upon the
|
|
canonical form to to the actual fixup.
|
|
|
|
Note that relocations are maintained on a per section basis,
|
|
whilst symbols are maintained on a per BFD basis.
|
|
|
|
All a back end has to do to fit the BFD interface is to create
|
|
as many <<struct reloc_cache_entry>> as there are relocations
|
|
in a particuar section, and fill in the right bits:
|
|
|
|
@menu
|
|
@* typedef arelent::
|
|
@* howto manager::
|
|
@end menu
|
|
|
|
*/
|
|
#include "bfd.h"
|
|
#include "sysdep.h"
|
|
#include "libbfd.h"
|
|
#include "seclet.h"
|
|
/*
|
|
DOCDD
|
|
INODE
|
|
typedef arelent, howto manager, Relocations, Relocations
|
|
|
|
SUBSECTION
|
|
typedef arelent
|
|
|
|
This is the structure of a relocation entry:
|
|
|
|
CODE_FRAGMENT
|
|
.
|
|
.typedef enum bfd_reloc_status
|
|
.{
|
|
. {* No errors detected *}
|
|
. bfd_reloc_ok,
|
|
.
|
|
. {* The relocation was performed, but there was an overflow. *}
|
|
. bfd_reloc_overflow,
|
|
.
|
|
. {* The address to relocate was not within the section supplied*}
|
|
. bfd_reloc_outofrange,
|
|
.
|
|
. {* Used by special functions *}
|
|
. bfd_reloc_continue,
|
|
.
|
|
. {* Unused *}
|
|
. bfd_reloc_notsupported,
|
|
.
|
|
. {* Unsupported relocation size requested. *}
|
|
. bfd_reloc_other,
|
|
.
|
|
. {* The symbol to relocate against was undefined.*}
|
|
. bfd_reloc_undefined,
|
|
.
|
|
. {* The relocation was performed, but may not be ok - presently
|
|
. generated only when linking i960 coff files with i960 b.out
|
|
. symbols. *}
|
|
. bfd_reloc_dangerous
|
|
. }
|
|
. bfd_reloc_status_type;
|
|
.
|
|
.
|
|
.typedef struct reloc_cache_entry
|
|
.{
|
|
. {* A pointer into the canonical table of pointers *}
|
|
. struct symbol_cache_entry **sym_ptr_ptr;
|
|
.
|
|
. {* offset in section *}
|
|
. rawdata_offset address;
|
|
.
|
|
. {* addend for relocation value *}
|
|
. bfd_vma addend;
|
|
.
|
|
. {* Pointer to how to perform the required relocation *}
|
|
. CONST struct reloc_howto_struct *howto;
|
|
.
|
|
.} arelent;
|
|
|
|
*/
|
|
|
|
/*
|
|
DESCRIPTION
|
|
|
|
Here is a description of each of the fields within a relent:
|
|
|
|
o sym_ptr_ptr
|
|
|
|
The symbol table pointer points to a pointer to the symbol
|
|
associated with the relocation request. This would naturally
|
|
be the pointer into the table returned by the back end's
|
|
get_symtab action. @xref{Symbols}. The symbol is referenced
|
|
through a pointer to a pointer so that tools like the linker
|
|
can fix up all the symbols of the same name by modifying only
|
|
one pointer. The relocation routine looks in the symbol and
|
|
uses the base of the section the symbol is attached to and the
|
|
value of the symbol as the initial relocation offset. If the
|
|
symbol pointer is zero, then the section provided is looked up.
|
|
|
|
o address
|
|
|
|
The address field gives the offset in bytes from the base of
|
|
the section data which owns the relocation record to the first
|
|
byte of relocatable information. The actual data relocated
|
|
will be relative to this point - for example, a relocation
|
|
type which modifies the bottom two bytes of a four byte word
|
|
would not touch the first byte pointed to in a big endian
|
|
world.
|
|
|
|
o addend
|
|
|
|
The addend is a value provided by the back end to be added (!)
|
|
to the relocation offset. Its interpretation is dependent upon
|
|
the howto. For example, on the 68k the code:
|
|
|
|
|
|
| char foo[];
|
|
| main()
|
|
| {
|
|
| return foo[0x12345678];
|
|
| }
|
|
|
|
Could be compiled into:
|
|
|
|
| linkw fp,#-4
|
|
| moveb @@#12345678,d0
|
|
| extbl d0
|
|
| unlk fp
|
|
| rts
|
|
|
|
|
|
This could create a reloc pointing to foo, but leave the
|
|
offset in the data (something like)
|
|
|
|
|
|
|RELOCATION RECORDS FOR [.text]:
|
|
|offset type value
|
|
|00000006 32 _foo
|
|
|
|
|
|00000000 4e56 fffc ; linkw fp,#-4
|
|
|00000004 1039 1234 5678 ; moveb @@#12345678,d0
|
|
|0000000a 49c0 ; extbl d0
|
|
|0000000c 4e5e ; unlk fp
|
|
|0000000e 4e75 ; rts
|
|
|
|
|
|
Using coff and an 88k, some instructions don't have enough
|
|
space in them to represent the full address range, and
|
|
pointers have to be loaded in two parts. So you'd get something like:
|
|
|
|
|
|
| or.u r13,r0,hi16(_foo+0x12345678)
|
|
| ld.b r2,r13,lo16(_foo+0x12345678)
|
|
| jmp r1
|
|
|
|
|
|
This whould create two relocs, both pointing to _foo, and with
|
|
0x12340000 in their addend field. The data would consist of:
|
|
|
|
|
|
|RELOCATION RECORDS FOR [.text]:
|
|
|offset type value
|
|
|00000002 HVRT16 _foo+0x12340000
|
|
|00000006 LVRT16 _foo+0x12340000
|
|
|
|
|00000000 5da05678 ; or.u r13,r0,0x5678
|
|
|00000004 1c4d5678 ; ld.b r2,r13,0x5678
|
|
|00000008 f400c001 ; jmp r1
|
|
|
|
|
|
The relocation routine digs out the value from the data, adds
|
|
it to the addend to get the original offset and then adds the
|
|
value of _foo. Note that all 32 bits have to be kept around
|
|
somewhere, to cope with carry from bit 15 to bit 16.
|
|
|
|
On further example is the sparc and the a.out format. The
|
|
sparc has a similar problem to the 88k, in that some
|
|
instructions don't have room for an entire offset, but on the
|
|
sparc the parts are created odd sized lumps. The designers of
|
|
the a.out format chose not to use the data within the section
|
|
for storing part of the offset; all the offset is kept within
|
|
the reloc. Any thing in the data should be ignored.
|
|
|
|
| save %sp,-112,%sp
|
|
| sethi %hi(_foo+0x12345678),%g2
|
|
| ldsb [%g2+%lo(_foo+0x12345678)],%i0
|
|
| ret
|
|
| restore
|
|
|
|
Both relocs contains a pointer to foo, and the offsets would
|
|
contain junk.
|
|
|
|
|
|
|RELOCATION RECORDS FOR [.text]:
|
|
|offset type value
|
|
|00000004 HI22 _foo+0x12345678
|
|
|00000008 LO10 _foo+0x12345678
|
|
|
|
|00000000 9de3bf90 ; save %sp,-112,%sp
|
|
|00000004 05000000 ; sethi %hi(_foo+0),%g2
|
|
|00000008 f048a000 ; ldsb [%g2+%lo(_foo+0)],%i0
|
|
|0000000c 81c7e008 ; ret
|
|
|00000010 81e80000 ; restore
|
|
|
|
|
|
o howto
|
|
|
|
The howto field can be imagined as a
|
|
relocation instruction. It is a pointer to a struct which
|
|
contains information on what to do with all the other
|
|
information in the reloc record and data section. A back end
|
|
would normally have a relocation instruction set and turn
|
|
relocations into pointers to the correct structure on input -
|
|
but it would be possible to create each howto field on demand.
|
|
|
|
*/
|
|
|
|
|
|
/*
|
|
SUBSUBSECTION
|
|
<<reloc_howto_type>>
|
|
|
|
The <<reloc_howto_type>> is a structure which contains all the
|
|
information that BFD needs to know to tie up a back end's data.
|
|
|
|
CODE_FRAGMENT
|
|
.struct symbol_cache_entry; {* Forward declaration *}
|
|
.
|
|
.typedef CONST struct reloc_howto_struct
|
|
.{
|
|
. {* The type field has mainly a documetary use - the back end can
|
|
. to what it wants with it, though the normally the back end's
|
|
. external idea of what a reloc number would be would be stored
|
|
. in this field. For example, the a PC relative word relocation
|
|
. in a coff environment would have the type 023 - because that's
|
|
. what the outside world calls a R_PCRWORD reloc. *}
|
|
. unsigned int type;
|
|
.
|
|
. {* The value the final relocation is shifted right by. This drops
|
|
. unwanted data from the relocation. *}
|
|
. unsigned int rightshift;
|
|
.
|
|
. {* The size of the item to be relocated - 0, is one byte, 1 is 2
|
|
. bytes, 3 is four bytes. A -ve value indicates that the
|
|
. result is to be subtracted from the data*}
|
|
. int size;
|
|
.
|
|
. {* Now obsolete *}
|
|
. unsigned int bitsize;
|
|
.
|
|
. {* Notes that the relocation is relative to the location in the
|
|
. data section of the addend. The relocation function will
|
|
. subtract from the relocation value the address of the location
|
|
. being relocated. *}
|
|
. boolean pc_relative;
|
|
.
|
|
. {* Now obsolete *}
|
|
. unsigned int bitpos;
|
|
.
|
|
. {* Now obsolete *}
|
|
. boolean absolute;
|
|
.
|
|
. {* Causes the relocation routine to return an error if overflow
|
|
. is detected when relocating. *}
|
|
. boolean complain_on_overflow;
|
|
.
|
|
. {* If this field is non null, then the supplied function is
|
|
. called rather than the normal function. This allows really
|
|
. strange relocation methods to be accomodated (eg, i960 callj
|
|
. instructions). *}
|
|
. bfd_reloc_status_type (*special_function)
|
|
. PARAMS ((bfd *abfd,
|
|
. arelent *reloc_entry,
|
|
. struct symbol_cache_entry *symbol,
|
|
. PTR data,
|
|
. asection *input_section,
|
|
. bfd *output_bfd));
|
|
.
|
|
. {* The textual name of the relocation type. *}
|
|
. char *name;
|
|
.
|
|
. {* When performing a partial link, some formats must modify the
|
|
. relocations rather than the data - this flag signals this.*}
|
|
. boolean partial_inplace;
|
|
.
|
|
. {* The src_mask is used to select what parts of the read in data
|
|
. are to be used in the relocation sum. Eg, if this was an 8 bit
|
|
. bit of data which we read and relocated, this would be
|
|
. 0x000000ff. When we have relocs which have an addend, such as
|
|
. sun4 extended relocs, the value in the offset part of a
|
|
. relocating field is garbage so we never use it. In this case
|
|
. the mask would be 0x00000000. *}
|
|
. bfd_word src_mask;
|
|
.
|
|
. {* The dst_mask is what parts of the instruction are replaced
|
|
. into the instruction. In most cases src_mask == dst_mask,
|
|
. except in the above special case, where dst_mask would be
|
|
. 0x000000ff, and src_mask would be 0x00000000. *}
|
|
. bfd_word dst_mask;
|
|
.
|
|
. {* When some formats create PC relative instructions, they leave
|
|
. the value of the pc of the place being relocated in the offset
|
|
. slot of the instruction, so that a PC relative relocation can
|
|
. be made just by adding in an ordinary offset (eg sun3 a.out).
|
|
. Some formats leave the displacement part of an instruction
|
|
. empty (eg m88k bcs), this flag signals the fact.*}
|
|
. boolean pcrel_offset;
|
|
.
|
|
.} reloc_howto_type;
|
|
|
|
*/
|
|
|
|
/*
|
|
FUNCTION
|
|
the HOWTO macro
|
|
|
|
DESCRIPTION
|
|
The HOWTO define is horrible and will go away.
|
|
|
|
|
|
.#define HOWTO(C, R,S,B, P, BI, ABS, O, SF, NAME, INPLACE, MASKSRC, MASKDST, PC) \
|
|
. {(unsigned)C,R,S,B, P, BI, ABS,O,SF,NAME,INPLACE,MASKSRC,MASKDST,PC}
|
|
|
|
DESCRIPTION
|
|
And will be replaced with the totally magic way. But for the
|
|
moment, we are compatible, so do it this way..
|
|
|
|
|
|
.#define NEWHOWTO( FUNCTION, NAME,SIZE,REL,IN) HOWTO(0,0,SIZE,0,REL,0,false,false,FUNCTION, NAME,false,0,0,IN)
|
|
.
|
|
DESCRIPTION
|
|
Helper routine to turn a symbol into a relocation value.
|
|
|
|
.#define HOWTO_PREPARE(relocation, symbol) \
|
|
. { \
|
|
. if (symbol != (asymbol *)NULL) { \
|
|
. if (symbol->section == &bfd_com_section) { \
|
|
. relocation = 0; \
|
|
. } \
|
|
. else { \
|
|
. relocation = symbol->value; \
|
|
. } \
|
|
. } \
|
|
.}
|
|
|
|
*/
|
|
|
|
/*
|
|
TYPEDEF
|
|
reloc_chain
|
|
|
|
DESCRIPTION
|
|
|
|
How relocs are tied together
|
|
|
|
.typedef unsigned char bfd_byte;
|
|
.
|
|
.typedef struct relent_chain {
|
|
. arelent relent;
|
|
. struct relent_chain *next;
|
|
.} arelent_chain;
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_perform_relocation
|
|
|
|
SYNOPSIS
|
|
bfd_reloc_status_type
|
|
bfd_perform_relocation
|
|
(bfd * abfd,
|
|
arelent *reloc_entry,
|
|
PTR data,
|
|
asection *input_section,
|
|
bfd *output_bfd);
|
|
|
|
DESCRIPTION
|
|
If an output_bfd is supplied to this function the generated
|
|
image will be relocatable, the relocations are copied to the
|
|
output file after they have been changed to reflect the new
|
|
state of the world. There are two ways of reflecting the
|
|
results of partial linkage in an output file; by modifying the
|
|
output data in place, and by modifying the relocation record.
|
|
Some native formats (eg basic a.out and basic coff) have no
|
|
way of specifying an addend in the relocation type, so the
|
|
addend has to go in the output data. This is no big deal
|
|
since in these formats the output data slot will always be big
|
|
enough for the addend. Complex reloc types with addends were
|
|
invented to solve just this problem.
|
|
|
|
*/
|
|
|
|
|
|
bfd_reloc_status_type
|
|
DEFUN(bfd_perform_relocation,(abfd,
|
|
reloc_entry,
|
|
data,
|
|
input_section,
|
|
output_bfd),
|
|
bfd *abfd AND
|
|
arelent *reloc_entry AND
|
|
PTR data AND
|
|
asection *input_section AND
|
|
bfd *output_bfd)
|
|
{
|
|
bfd_vma relocation;
|
|
bfd_reloc_status_type flag = bfd_reloc_ok;
|
|
bfd_vma addr = reloc_entry->address ;
|
|
bfd_vma output_base = 0;
|
|
reloc_howto_type *howto = reloc_entry->howto;
|
|
asection *reloc_target_output_section ;
|
|
|
|
asymbol *symbol;
|
|
|
|
symbol = *( reloc_entry->sym_ptr_ptr);
|
|
if ((symbol->section == &bfd_abs_section)
|
|
&& output_bfd != (bfd *)NULL)
|
|
{
|
|
reloc_entry->address += input_section->output_offset;
|
|
|
|
return bfd_reloc_ok;
|
|
|
|
}
|
|
|
|
if ((symbol->section == &bfd_und_section) && output_bfd == (bfd *)NULL) {
|
|
flag = bfd_reloc_undefined;
|
|
}
|
|
|
|
if (howto->special_function) {
|
|
bfd_reloc_status_type cont;
|
|
cont = howto->special_function(abfd,
|
|
reloc_entry,
|
|
symbol,
|
|
data,
|
|
input_section,
|
|
output_bfd);
|
|
if (cont != bfd_reloc_continue) return cont;
|
|
}
|
|
|
|
/*
|
|
Work out which section the relocation is targetted at and the
|
|
initial relocation command value.
|
|
*/
|
|
|
|
|
|
if (symbol->section == &bfd_com_section) {
|
|
relocation = 0;
|
|
}
|
|
else {
|
|
relocation = symbol->value;
|
|
}
|
|
|
|
|
|
reloc_target_output_section = symbol->section->output_section;
|
|
|
|
if (output_bfd && howto->partial_inplace==false) {
|
|
output_base = 0;
|
|
}
|
|
else {
|
|
output_base = reloc_target_output_section->vma;
|
|
|
|
}
|
|
|
|
relocation += output_base + symbol->section->output_offset;
|
|
|
|
|
|
relocation += reloc_entry->addend ;
|
|
|
|
|
|
if(reloc_entry->address > input_section->_cooked_size)
|
|
{
|
|
return bfd_reloc_outofrange;
|
|
}
|
|
|
|
|
|
if (howto->pc_relative == true)
|
|
{
|
|
/*
|
|
Anything which started out as pc relative should end up that
|
|
way too.
|
|
|
|
There are two ways we can see a pcrel instruction. Sometimes
|
|
the pcrel displacement has been partially calculated, it
|
|
includes the distance from the start of the section to the
|
|
instruction in it (eg sun3), and sometimes the field is
|
|
totally blank - eg m88kbcs.
|
|
*/
|
|
|
|
|
|
relocation -=
|
|
input_section->output_section->vma + input_section->output_offset;
|
|
|
|
if (howto->pcrel_offset == true) {
|
|
relocation -= reloc_entry->address;
|
|
}
|
|
|
|
}
|
|
|
|
if (output_bfd!= (bfd *)NULL)
|
|
{
|
|
if ( howto->partial_inplace == false)
|
|
{
|
|
/*
|
|
This is a partial relocation, and we want to apply the relocation
|
|
to the reloc entry rather than the raw data. Modify the reloc
|
|
inplace to reflect what we now know.
|
|
*/
|
|
reloc_entry->addend = relocation ;
|
|
reloc_entry->address += input_section->output_offset;
|
|
return flag;
|
|
}
|
|
else
|
|
{
|
|
/* This is a partial relocation, but inplace, so modify the
|
|
reloc record a bit.
|
|
|
|
If we've relocated with a symbol with a section, change
|
|
into a ref to the section belonging to the symbol
|
|
*/
|
|
|
|
reloc_entry->address += input_section->output_offset;
|
|
|
|
if (abfd->xvec->flavour == bfd_target_coff_flavour)
|
|
{
|
|
relocation -= reloc_entry->addend;
|
|
reloc_entry->addend = 0;
|
|
}
|
|
else
|
|
{
|
|
reloc_entry->addend = relocation ;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
reloc_entry->addend = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
Either we are relocating all the way, or we don't want to apply
|
|
the relocation to the reloc entry (probably because there isn't
|
|
any room in the output format to describe addends to relocs)
|
|
*/
|
|
relocation >>= howto->rightshift;
|
|
|
|
/* Shift everything up to where it's going to be used */
|
|
|
|
relocation <<= howto->bitpos;
|
|
|
|
/* Wait for the day when all have the mask in them */
|
|
|
|
/* What we do:
|
|
i instruction to be left alone
|
|
o offset within instruction
|
|
r relocation offset to apply
|
|
S src mask
|
|
D dst mask
|
|
N ~dst mask
|
|
A part 1
|
|
B part 2
|
|
R result
|
|
|
|
Do this:
|
|
i i i i i o o o o o from bfd_get<size>
|
|
and S S S S S to get the size offset we want
|
|
+ r r r r r r r r r r to get the final value to place
|
|
and D D D D D to chop to right size
|
|
-----------------------
|
|
A A A A A
|
|
And this:
|
|
... i i i i i o o o o o from bfd_get<size>
|
|
and N N N N N get instruction
|
|
-----------------------
|
|
... B B B B B
|
|
|
|
And then:
|
|
B B B B B
|
|
or A A A A A
|
|
-----------------------
|
|
R R R R R R R R R R put into bfd_put<size>
|
|
*/
|
|
|
|
#define DOIT(x) \
|
|
x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask))
|
|
|
|
switch (howto->size)
|
|
{
|
|
case 0:
|
|
{
|
|
char x = bfd_get_8(abfd, (char *)data + addr);
|
|
DOIT(x);
|
|
bfd_put_8(abfd,x, (unsigned char *) data + addr);
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
{
|
|
short x = bfd_get_16(abfd, (bfd_byte *)data + addr);
|
|
DOIT(x);
|
|
bfd_put_16(abfd, x, (unsigned char *)data + addr);
|
|
}
|
|
break;
|
|
case 2:
|
|
{
|
|
long x = bfd_get_32(abfd, (bfd_byte *) data + addr);
|
|
DOIT(x);
|
|
bfd_put_32(abfd,x, (bfd_byte *)data + addr);
|
|
}
|
|
break;
|
|
case -2:
|
|
{
|
|
long x = bfd_get_32(abfd, (bfd_byte *) data + addr);
|
|
relocation = -relocation;
|
|
DOIT(x);
|
|
bfd_put_32(abfd,x, (bfd_byte *)data + addr);
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
|
|
/* Do nothing */
|
|
break;
|
|
default:
|
|
return bfd_reloc_other;
|
|
}
|
|
|
|
return flag;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
DOCDD
|
|
INODE
|
|
howto manager, , typedef arelent, Relocations
|
|
|
|
SECTION
|
|
The howto manager
|
|
|
|
When an application wants to create a relocation, but doesn't
|
|
know what the target machine might call it, it can find out by
|
|
using this bit of code.
|
|
|
|
*/
|
|
|
|
/*
|
|
TYPEDEF
|
|
bfd_reloc_code_type
|
|
|
|
DESCRIPTION
|
|
The insides of a reloc code
|
|
|
|
CODE_FRAGMENT
|
|
.
|
|
.typedef enum bfd_reloc_code_real
|
|
.
|
|
.{
|
|
. {* 16 bits wide, simple reloc *}
|
|
. BFD_RELOC_16,
|
|
.
|
|
. {* 8 bits wide, but used to form an address like 0xffnn *}
|
|
. BFD_RELOC_8_FFnn,
|
|
.
|
|
. {* 8 bits wide, simple *}
|
|
. BFD_RELOC_8,
|
|
.
|
|
. {* 8 bits wide, pc relative *}
|
|
. BFD_RELOC_8_PCREL,
|
|
.
|
|
. {* The type of reloc used to build a contructor table - at the
|
|
. moment probably a 32 bit wide abs address, but the cpu can
|
|
. choose. *}
|
|
.
|
|
. BFD_RELOC_CTOR,
|
|
.
|
|
. {* 32 bits wide, simple reloc *}
|
|
. BFD_RELOC_32,
|
|
. {* 32 bits, PC-relative *}
|
|
. BFD_RELOC_32_PCREL,
|
|
.
|
|
. {* High 22 bits of 32-bit value; simple reloc. *}
|
|
. BFD_RELOC_HI22,
|
|
. {* Low 10 bits. *}
|
|
. BFD_RELOC_LO10,
|
|
.
|
|
. {* Reloc types used for i960/b.out. *}
|
|
. BFD_RELOC_24_PCREL,
|
|
. BFD_RELOC_I960_CALLJ,
|
|
.
|
|
. BFD_RELOC_16_PCREL,
|
|
. {* 32-bit pc-relative, shifted right 2 bits (i.e., 30-bit
|
|
. word displacement, e.g. for SPARC) *}
|
|
. BFD_RELOC_32_PCREL_S2,
|
|
.
|
|
. {* now for the sparc/elf codes *}
|
|
. BFD_RELOC_NONE, {* actually used *}
|
|
. BFD_RELOC_SPARC_WDISP22,
|
|
. BFD_RELOC_SPARC22,
|
|
. BFD_RELOC_SPARC13,
|
|
. BFD_RELOC_SPARC_BASE13,
|
|
. BFD_RELOC_SPARC_GOT10,
|
|
. BFD_RELOC_SPARC_GOT13,
|
|
. BFD_RELOC_SPARC_GOT22,
|
|
. BFD_RELOC_SPARC_PC10,
|
|
. BFD_RELOC_SPARC_PC22,
|
|
. BFD_RELOC_SPARC_WPLT30,
|
|
. BFD_RELOC_SPARC_COPY,
|
|
. BFD_RELOC_SPARC_GLOB_DAT,
|
|
. BFD_RELOC_SPARC_JMP_SLOT,
|
|
. BFD_RELOC_SPARC_RELATIVE,
|
|
. BFD_RELOC_SPARC_UA32,
|
|
.
|
|
. {* this one is a.out specific? *}
|
|
. BFD_RELOC_SPARC_BASE22,
|
|
.
|
|
. {* this must be the highest numeric value *}
|
|
. BFD_RELOC_UNUSED
|
|
. } bfd_reloc_code_real_type;
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
SECTION
|
|
bfd_reloc_type_lookup
|
|
|
|
SYNOPSIS
|
|
CONST struct reloc_howto_struct *
|
|
bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code);
|
|
|
|
DESCRIPTION
|
|
This routine returns a pointer to a howto struct which when
|
|
invoked, will perform the supplied relocation on data from the
|
|
architecture noted.
|
|
|
|
*/
|
|
|
|
|
|
CONST struct reloc_howto_struct *
|
|
DEFUN(bfd_reloc_type_lookup,(abfd, code),
|
|
bfd *abfd AND
|
|
bfd_reloc_code_real_type code)
|
|
{
|
|
return BFD_SEND (abfd, reloc_type_lookup, (abfd, code));
|
|
}
|
|
|
|
static reloc_howto_type bfd_howto_32 =
|
|
HOWTO(0, 00,2,32,false,0,false,true,0,"VRT32", false,0xffffffff,0xffffffff,true);
|
|
|
|
|
|
/*
|
|
INTERNAL_FUNCTION
|
|
bfd_default_reloc_type_lookup
|
|
|
|
SYNOPSIS
|
|
CONST struct reloc_howto_struct *bfd_default_reloc_type_lookup
|
|
(CONST struct bfd_arch_info *,
|
|
bfd_reloc_code_real_type code);
|
|
|
|
DESCRIPTION
|
|
Provides a default relocation lookuperer for any architectue
|
|
|
|
|
|
*/
|
|
CONST struct reloc_howto_struct *
|
|
DEFUN(bfd_default_reloc_type_lookup,(arch, code),
|
|
CONST struct bfd_arch_info *arch AND
|
|
bfd_reloc_code_real_type code)
|
|
{
|
|
switch (code)
|
|
{
|
|
case BFD_RELOC_CTOR:
|
|
/* The type of reloc used in a ctor, which will be as wide as the
|
|
address - so either a 64, 32, or 16 bitter.. */
|
|
switch (arch->bits_per_address) {
|
|
case 64:
|
|
BFD_FAIL();
|
|
case 32:
|
|
return &bfd_howto_32;
|
|
case 16:
|
|
BFD_FAIL();
|
|
default:
|
|
BFD_FAIL();
|
|
}
|
|
default:
|
|
BFD_FAIL();
|
|
}
|
|
return (CONST struct reloc_howto_struct *)NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
INTERNAL_FUNCTION
|
|
bfd_generic_relax_section
|
|
|
|
SYNOPSIS
|
|
boolean bfd_generic_relax_section
|
|
(bfd *abfd,
|
|
asection *section,
|
|
asymbol **symbols);
|
|
|
|
DESCRIPTION
|
|
Provides default handling for relaxing for back ends which
|
|
don't do relaxing -- i.e., does nothing.
|
|
*/
|
|
|
|
boolean
|
|
DEFUN(bfd_generic_relax_section,(abfd, section, symbols),
|
|
bfd *abfd AND
|
|
asection *section AND
|
|
asymbol **symbols)
|
|
{
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
INTERNAL_FUNCTION
|
|
bfd_generic_get_relocated_section_contents
|
|
|
|
SYNOPSIS
|
|
bfd_byte *
|
|
bfd_generic_get_relocated_section_contents(bfd *abfd,
|
|
struct bfd_seclet_struct *seclet,
|
|
bfd_byte *data)
|
|
|
|
DESCRIPTION
|
|
Provides default handling of relocation effort for back ends
|
|
which can't be bothered to do it efficiently.
|
|
|
|
*/
|
|
|
|
bfd_byte *
|
|
DEFUN(bfd_generic_get_relocated_section_contents,(abfd, seclet, data),
|
|
bfd *abfd AND
|
|
struct bfd_seclet_struct *seclet AND
|
|
bfd_byte *data)
|
|
{
|
|
extern bfd_error_vector_type bfd_error_vector;
|
|
|
|
/* Get enough memory to hold the stuff */
|
|
bfd *input_bfd = seclet->u.indirect.section->owner;
|
|
asection *input_section = seclet->u.indirect.section;
|
|
|
|
|
|
|
|
bfd_size_type reloc_size = bfd_get_reloc_upper_bound(input_bfd,
|
|
input_section);
|
|
arelent **reloc_vector = (arelent **) alloca(reloc_size);
|
|
|
|
/* read in the section */
|
|
bfd_get_section_contents(input_bfd,
|
|
input_section,
|
|
data,
|
|
0,
|
|
input_section->_raw_size);
|
|
|
|
/* We're not relaxing the section, so just copy the size info */
|
|
input_section->_cooked_size = input_section->_raw_size;
|
|
input_section->reloc_done = true;
|
|
|
|
|
|
if (bfd_canonicalize_reloc(input_bfd,
|
|
input_section,
|
|
reloc_vector,
|
|
seclet->u.indirect.symbols) )
|
|
{
|
|
arelent **parent;
|
|
for (parent = reloc_vector; * parent != (arelent *)NULL;
|
|
parent++)
|
|
{
|
|
bfd_reloc_status_type r=
|
|
bfd_perform_relocation(input_bfd,
|
|
*parent,
|
|
data,
|
|
input_section, 0);
|
|
|
|
|
|
if (r != bfd_reloc_ok)
|
|
{
|
|
switch (r)
|
|
{
|
|
case bfd_reloc_undefined:
|
|
bfd_error_vector.undefined_symbol(*parent, seclet);
|
|
break;
|
|
case bfd_reloc_dangerous:
|
|
bfd_error_vector.reloc_dangerous(*parent, seclet);
|
|
break;
|
|
case bfd_reloc_outofrange:
|
|
case bfd_reloc_overflow:
|
|
bfd_error_vector.reloc_value_truncated(*parent, seclet);
|
|
break;
|
|
default:
|
|
abort();
|
|
break;
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
return data;
|
|
|
|
|
|
}
|
|
|