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* som.c (som_reloc_call): New function.

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Jeff Law 1993-11-13 07:22:06 +00:00
parent 2212ff9277
commit 7057b78fb8
2 changed files with 119 additions and 0 deletions
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2
bfd/ChangeLog
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@ -1,5 +1,7 @@
Fri Nov 12 15:29:36 1993 Jeffrey A. Law (law@snake.cs.utah.edu)
* som.c (som_reloc_call): New function.
* som.c (som_sizeof_headers): Add missing prototype.
(som_set_arch_mach): Do not abort.

117
bfd/som.c
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@ -149,6 +149,10 @@ static unsigned char * som_reloc_skip PARAMS ((bfd *, unsigned int,
static unsigned char * som_reloc_addend PARAMS ((bfd *, int, unsigned char *,
unsigned int *,
struct reloc_queue *));
static unsigned char * som_reloc_call PARAMS ((bfd *, unsigned char *,
unsigned int *,
arelent *, int,
struct reloc_queue *));
static unsigned long som_count_spaces PARAMS ((bfd *));
static unsigned long som_count_subspaces PARAMS ((bfd *));
static int compare_syms PARAMS ((asymbol **, asymbol **));
@ -670,6 +674,119 @@ som_reloc_addend (abfd, addend, p, subspace_reloc_sizep, queue)
return p;
}
/* Handle a single function call relocation. */
static unsigned char *
som_reloc_call (abfd, p, subspace_reloc_sizep, bfd_reloc, sym_num, queue)
bfd *abfd;
unsigned char *p;
unsigned int *subspace_reloc_sizep;
arelent *bfd_reloc;
int sym_num;
struct reloc_queue *queue;
{
int arg_bits = HPPA_R_ARG_RELOC (bfd_reloc->addend);
int rtn_bits = arg_bits & 0x3;
int type, done = 0;
/* You'll never believe all this is necessary to handle relocations
for function calls. Having to compute and pack the argument
relocation bits is the real nightmare.
If you're interested in how this works, just forget it. You really
do not want to know about this braindamage. */
/* First see if this can be done with a "simple" relocation. Simple
relocations have a symbol number < 0x100 and have simple encodings
of argument relocations. */
if (sym_num < 0x100)
{
switch (arg_bits)
{
case 0:
case 1:
type = 0;
break;
case 1 << 8:
case 1 << 8 | 1:
type = 1;
break;
case 1 << 8 | 1 << 6:
case 1 << 8 | 1 << 6 | 1:
type = 2;
break;
case 1 << 8 | 1 << 6 | 1 << 4:
case 1 << 8 | 1 << 6 | 1 << 4 | 1:
type = 3;
break;
case 1 << 8 | 1 << 6 | 1 << 4 | 1 << 2:
case 1 << 8 | 1 << 6 | 1 << 4 | 1 << 2 | 1:
type = 4;
break;
default:
/* Not one of the easy encodings. This will have to be
handled by the more complex code below. */
type = -1;
break;
}
if (type != -1)
{
/* Account for the return value too. */
if (rtn_bits)
type += 5;
/* Emit a 2 byte relocation. Then see if it can be handled
with a relocation which is already in the relocation queue. */
bfd_put_8 (abfd, bfd_reloc->howto->type + type, p);
bfd_put_8 (abfd, sym_num, p + 1);
p = try_prev_fixup (abfd, subspace_reloc_sizep, p, 2, queue);
done = 1;
}
}
/* If this could not be handled with a simple relocation, then do a hard
one. Hard relocations occur if the symbol number was too high or if
the encoding of argument relocation bits is too complex. */
if (! done)
{
/* Don't ask about these magic sequences. I took them straight
from gas-1.36 which took them from the a.out man page. */
type = rtn_bits;
if ((arg_bits >> 6 & 0xf) == 0xe)
type += 9 * 40;
else
type += (3 * (arg_bits >> 8 & 3) + (arg_bits >> 6 & 3)) * 40;
if ((arg_bits >> 2 & 0xf) == 0xe)
type += 9 * 4;
else
type += (3 * (arg_bits >> 4 & 3) + (arg_bits >> 2 & 3)) * 4;
/* Output the first two bytes of the relocation. These describe
the length of the relocation and encoding style. */
bfd_put_8 (abfd, bfd_reloc->howto->type + 10
+ 2 * (sym_num >= 0x100) + (type >= 0x100),
p);
bfd_put_8 (abfd, type, p + 1);
/* Now output the symbol index and see if this bizarre relocation
just happened to be in the relocation queue. */
if (sym_num < 0x100)
{
bfd_put_8 (abfd, sym_num, p + 2);
p = try_prev_fixup (abfd, subspace_reloc_sizep, p, 3, queue);
}
else
{
bfd_put_8 (abfd, sym_num >> 16, p + 2);
bfd_put_16 (abfd, sym_num, p + 3);
p = try_prev_fixup (abfd, subspace_reloc_sizep, p, 5, queue);
}
}
return p;
}
/* Return the logarithm of X, base 2, considering X unsigned.
Abort if X is not a power of two -- this should never happen (FIXME:
It will happen on corrupt executables. GDB should give an error, not