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Handle same-section relocations where the destination is at an address >=

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0x00400000.
This commit is contained in:
Nick Clifton 2000-03-17 19:35:44 +00:00
parent ccdaf797f7
commit 672314026c
2 changed files with 59 additions and 4 deletions
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5
gas/ChangeLog
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@ -1,3 +1,8 @@
2000-03-17 Nick Clifton <nickc@cygnus.com>
* config/tc-arm.c (md_apply_fix3): Handle same-section relocations
that have a destingation >= 0x400000.
Thu Mar 16 23:45:16 2000 J"orn Rennecke <amylaar@cygnus.co.uk>
* config/tc-sh.c (md_begin): When encountering insn that are

58
gas/config/tc-arm.c
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@ -5560,13 +5560,63 @@ md_apply_fix3 (fixP, val, seg)
case BFD_RELOC_ARM_PCREL_BRANCH:
newval = md_chars_to_number (buf, INSN_SIZE);
/* Sign-extend a 24-bit number. */
#define SEXT24(x) ((((x) & 0xffffff) ^ (~ 0x7fffff)) + 0x800000)
#ifdef OBJ_ELF
if (! target_oabi)
value = fixP->fx_offset;
value = fixP->fx_offset;
#endif
value = (value >> 2) & 0x00ffffff;
value = (value + (newval & 0x00ffffff)) & 0x00ffffff;
newval = value | (newval & 0xff000000);
/* We are going to store value (shifted right by two) in the
instruction, in a 24 bit, signed field. Thus we need to check
that none of the top 8 bits of the shifted value (top 7 bits of
the unshifted, unsigned value) are set, or that they are all set. */
if ((value & 0xfe000000UL) != 0
&& ((value & 0xfe000000UL) != 0xfe000000UL))
{
#ifdef OBJ_ELF
/* Normally we would be stuck at this point, since we cannot store
the absolute address that is the destination of the branch in the
24 bits of the branch instruction. If however, we happen to know
that the destination of the branch is in the same section as the
branch instruciton itself, then we can compute the relocation for
ourselves and not have to bother the linker with it.
FIXME: The tests for OBJ_ELF and ! target_oabi are only here
because I have not worked out how to do this for OBJ_COFF or
target_oabi. */
if (! target_oabi
&& fixP->fx_addsy != NULL
&& S_IS_DEFINED (fixP->fx_addsy)
&& S_GET_SEGMENT (fixP->fx_addsy) == seg)
{
/* Get pc relative value to go into the branch. */
value = * val;
/* Permit a backward branch provided that enough bits are set.
Allow a forwards branch, provided that enough bits are clear. */
if ((value & 0xfe000000UL) == 0xfe000000UL
|| (value & 0xfe000000UL) == 0)
fixP->fx_done = 1;
}
if (! fixP->fx_done)
#endif
as_bad_where (fixP->fx_file, fixP->fx_line,
_("gas can't handle same-section branch dest >= 0x04000000"));
}
value >>= 2;
value += SEXT24 (newval);
if ((value & 0xff000000UL) != 0
&& (fixP->fx_done == 0
|| ((value & 0xff000000UL) != 0xff000000UL)))
as_bad_where (fixP->fx_file, fixP->fx_line,
_("out of range branch"));
newval = (value & 0x00ffffff) | (newval & 0xff000000);
md_number_to_chars (buf, newval, INSN_SIZE);
break;