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* som.c (som_prep_for_fixups): New function.

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Jeff Law 1993-11-13 23:28:34 +00:00
parent 938fa52b82
commit aff9779048
2 changed files with 101 additions and 0 deletions
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4
bfd/ChangeLog
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@ -1,3 +1,7 @@
Sat Nov 13 15:27:15 1993 Jeffrey A. Law (law@snake.cs.utah.edu)
* som.c (som_prep_for_fixups): New function.
Fri Nov 12 15:29:36 1993 Jeffrey A. Law (law@snake.cs.utah.edu)
* som.c (som_write_object_contents): Do not abort. Flesh out.

97
bfd/som.c
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@ -161,6 +161,7 @@ static boolean som_prep_headers PARAMS ((bfd *));
static int som_sizeof_headers PARAMS ((bfd *, boolean));
static boolean som_write_headers PARAMS ((bfd *));
static boolean som_build_and_write_symbol_table PARAMS ((bfd *));
static void som_prep_for_fixups PARAMS ((bfd *, asymbol **, unsigned long));
static reloc_howto_type som_hppa_howto_table[] =
@ -1443,6 +1444,102 @@ compare_syms (sym1, sym2)
return 0;
}
/* Perform various work in preparation for emitting the fixup stream. */
static void
som_prep_for_fixups (abfd, syms, num_syms)
bfd *abfd;
asymbol **syms;
unsigned long num_syms;
{
int i;
asection *section;
/* Most SOM relocations involving a symbol have a length which is
dependent on the index of the symbol. So symbols which are
used often in relocations should have a small index. */
/* First initialize the counters for each symbol. */
for (i = 0; i < num_syms; i++)
{
/* Handle a section symbol; these have no pointers back to the
SOM symbol info. So we just use the pointer field (udata)
to hold the relocation count.
FIXME. While we're here set the name of any section symbol
to something which will not screw GDB. How do other formats
deal with this?!? */
if (som_symbol_data (syms[i]) == NULL)
{
syms[i]->flags |= BSF_SECTION_SYM;
syms[i]->name = "L$0\002";
syms[i]->udata = (PTR) 0;
}
else
(*som_symbol_data (syms[i]))->reloc_count = 0;
}
/* Now that the counters are initialized, make a weighted count
of how often a given symbol is used in a relocation. */
for (section = abfd->sections; section != NULL; section = section->next)
{
int i;
/* Does this section have any relocations? */
if (section->reloc_count <= 0)
continue;
/* Walk through each relocation for this section. */
for (i = 1; i < section->reloc_count; i++)
{
arelent *reloc = section->orelocation[i];
int scale;
/* If no symbol, then there is no counter to increase. */
if (reloc->sym_ptr_ptr == NULL)
continue;
/* Scaling to encourage symbols involved in R_DP_RELATIVE
and R_CODE_ONE_SYMBOL relocations to come first. These
two relocations have single byte versions if the symbol
index is very small. */
if (reloc->howto->type == R_DP_RELATIVE
|| reloc->howto->type == R_CODE_ONE_SYMBOL)
scale = 2;
else
scale = 1;
/* Handle section symbols by ramming the count in the udata
field. It will not be used and the count is very important
for these symbols. */
if ((*reloc->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
{
(*reloc->sym_ptr_ptr)->udata =
(PTR) ((int) (*reloc->sym_ptr_ptr)->udata + scale);
continue;
}
/* A normal symbol. Increment the count. */
(*som_symbol_data ((*reloc->sym_ptr_ptr)))->reloc_count += scale;
}
}
/* Now sort the symbols. */
qsort (syms, num_syms, sizeof (asymbol *), compare_syms);
/* Compute the symbol indexes, they will be needed by the relocation
code. */
for (i = 0; i < num_syms; i++)
{
/* A section symbol. Again, there is no pointer to backend symbol
information, so we reuse (abuse) the udata field again. */
if (syms[i]->flags & BSF_SECTION_SYM)
syms[i]->udata = (PTR) i;
else
(*som_symbol_data (syms[i]))->index = i;
}
}
/* Finally, scribble out the various headers to the disk. */
static boolean