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Allow address wrap for bitfields again.

This commit is contained in:
Alan Modra 2000-04-11 23:01:50 +00:00
parent 287e305808
commit 8a4ac87108
2 changed files with 17 additions and 9 deletions
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6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2000-04-12 Alan Modra <alan@linuxcare.com.au>
* reloc.c (_bfd_relocate_contents): In complain_overflow_bitfield
case, allow address wrap-around stupidly removed 2000-03-17. Sign
extend without an if statement.
2000-04-11 Alan Modra <alan@linuxcare.com.au>
* coff-mips.c (mips_gprel_reloc): Test for 16 bit range using

20
bfd/reloc.c
View File

@ -1498,11 +1498,9 @@ _bfd_relocate_contents (howto, input_bfd, relocation, location)
trouble; we would need to verify that B is in range, as
we do for A above. */
signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
if ((b & signmask) != 0)
{
/* Set all the bits above the sign bit. */
b -= signmask << 1;
}
/* Set all the bits above the sign bit. */
b = (b ^ signmask) - signmask;
b = (b & addrmask) >> bitpos;
@ -1545,7 +1543,7 @@ _bfd_relocate_contents (howto, input_bfd, relocation, location)
case complain_overflow_bitfield:
/* Much like the signed check, but for a field one bit
wider, and no trimming with addrmask. We allow a
wider, and no trimming inputs with addrmask. We allow a
bitfield to represent numbers in the range -2**n to
2**n-1, where n is the number of bits in the field.
Note that when bfd_vma is 32 bits, a 32-bit reloc can't
@ -1558,15 +1556,19 @@ _bfd_relocate_contents (howto, input_bfd, relocation, location)
flag = bfd_reloc_overflow;
signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
if ((b & signmask) != 0)
b -= signmask << 1;
b = (b ^ signmask) - signmask;
b >>= bitpos;
sum = a + b;
/* We mask with addrmask here to explicitly allow an address
wrap-around. The Linux kernel relies on it, and it is
the only way to write assembler code which can run when
loaded at a location 0x80000000 away from the location at
which it is linked. */
signmask = fieldmask + 1;
if (((~ (a ^ b)) & (a ^ sum)) & signmask)
if (((~ (a ^ b)) & (a ^ sum)) & signmask & addrmask)
flag = bfd_reloc_overflow;
break;