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* read.c (emit_expr): Check for overflow of a negative value

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correctly.
	* write.c (fixup_segment): Likewise.
	* config/obj-coff.c (fixup_segment): Likewise.
PR 11411.
This commit is contained in:
Ian Lance Taylor
1997-01-09 19:13:42 +00:00
parent d703b5a783
commit 6468dabdec
2 changed files with 21 additions and 3 deletions
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5
gas/ChangeLog
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@ -1,5 +1,10 @@
Thu Jan 9 09:08:43 1997 Ian Lance Taylor <ian@cygnus.com> Thu Jan 9 09:08:43 1997 Ian Lance Taylor <ian@cygnus.com>
* read.c (emit_expr): Check for overflow of a negative value
correctly.
* write.c (fixup_segment): Likewise.
* config/obj-coff.c (fixup_segment): Likewise.
* config/tc-m68k.c (struct label_line): Define. * config/tc-m68k.c (struct label_line): Define.
(labels, current_label): New static variables. (labels, current_label): New static variables.
(md_assemble): Mark current_label as text, and clear it. (md_assemble): Mark current_label as text, and clear it.

19
gas/read.c
View File

@ -3198,14 +3198,25 @@ emit_expr (exp, nbytes)
register valueT get; register valueT get;
register valueT use; register valueT use;
register valueT mask; register valueT mask;
valueT hibit;
register valueT unmask; register valueT unmask;
/* JF << of >= number of bits in the object is undefined. In /* JF << of >= number of bits in the object is undefined. In
particular SPARC (Sun 4) has problems */ particular SPARC (Sun 4) has problems */
if (nbytes >= sizeof (valueT)) if (nbytes >= sizeof (valueT))
mask = 0; {
mask = 0;
if (nbytes > sizeof (valueT))
hibit = 0;
else
hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1);
}
else else
mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */ {
/* Don't store these bits. */
mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes);
hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1);
}
unmask = ~mask; /* Do store these bits. */ unmask = ~mask; /* Do store these bits. */
@ -3216,7 +3227,9 @@ emit_expr (exp, nbytes)
get = exp->X_add_number; get = exp->X_add_number;
use = get & unmask; use = get & unmask;
if ((get & mask) != 0 && (get & mask) != mask) if ((get & mask) != 0
&& ((get & mask) != mask
|| (get & hibit) == 0))
{ /* Leading bits contain both 0s & 1s. */ { /* Leading bits contain both 0s & 1s. */
as_warn ("Value 0x%lx truncated to 0x%lx.", as_warn ("Value 0x%lx truncated to 0x%lx.",
(unsigned long) get, (unsigned long) use); (unsigned long) get, (unsigned long) use);