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Fix a problem with 32-bit displacements in .code16gcc mode.

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This commit is contained in:
Alan Modra 2000-06-22 10:49:13 +00:00
parent f777891334
commit 45288df104
2 changed files with 39 additions and 19 deletions
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8
gas/ChangeLog
View File

@ -1,3 +1,11 @@
2000-06-22 Alan Modra <alan@linuxcare.com.au>
* config/tc-i386.c (i386_displacement): Don't assume a constant
displacement is necessarily 16 bits when in 16 bit code mode.
(md_assemble): Instead size the displacement here after we know
for sure that a .code16gcc operand hasn't automatically added
operand size prefixes.
2000-06-21 H.J. Lu <hjl@gnu.org>
* Makefile.am: Rebuild dependency.

50
gas/config/tc-i386.c
View File

@ -1461,6 +1461,31 @@ md_assemble (line)
}
}
if (i.disp_operands)
{
/* Try to use the smallest displacement type too. */
int op;
for (op = i.operands; --op >= 0; )
if ((i.types[op] & Disp)
&& i.op[op].imms->X_op == O_constant)
{
offsetT disp = i.op[op].disps->X_add_number;
if (i.types[op] & Disp16)
{
/* We know this operand is at most 16 bits, so
convert to a signed 16 bit number before trying
to see whether it will fit in an even smaller
size. */
disp = (((disp & 0xffff) ^ 0x8000) - 0x8000);
}
if (fits_in_signed_byte (disp))
i.types[op] |= Disp8;
}
}
overlap0 = 0;
overlap1 = 0;
overlap2 = 0;
@ -2920,28 +2945,15 @@ i386_displacement (disp_start, disp_end)
exp->X_op_symbol = (symbolS *) 0;
}
if (exp->X_op == O_constant)
{
if (i.types[this_operand] & Disp16)
{
/* We know this operand is at most 16 bits, so convert to a
signed 16 bit number before trying to see whether it will
fit in an even smaller size. */
exp->X_add_number =
(((exp->X_add_number & 0xffff) ^ 0x8000) - 0x8000);
}
if (fits_in_signed_byte (exp->X_add_number))
i.types[this_operand] |= Disp8;
}
#if (defined (OBJ_AOUT) || defined (OBJ_MAYBE_AOUT))
else if (
if (exp->X_op != O_constant
#ifdef BFD_ASSEMBLER
OUTPUT_FLAVOR == bfd_target_aout_flavour &&
&& OUTPUT_FLAVOR == bfd_target_aout_flavour
#endif
exp_seg != text_section
&& exp_seg != data_section
&& exp_seg != bss_section
&& exp_seg != undefined_section)
&& exp_seg != text_section
&& exp_seg != data_section
&& exp_seg != bss_section
&& exp_seg != undefined_section)
{
#ifdef BFD_ASSEMBLER
as_bad (_("unimplemented segment %s in operand"), exp_seg->name);