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binutils-gdb
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ubsan: ia64: left shift of negative value 

Here, since val is signed:
   *valuep = (val << scale);

	* cpu-ia64-opc.c (ext_imms_scaled): Avoid undefined left shift
	of negative values by using unsigned vars.
This commit is contained in:
Alan Modra 2019-12-10 17:57:14 +10:30
parent d1f80fe061
commit 8ff23dba80
2 changed files with 8 additions and 3 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
2019-12-11 Alan Modra <amodra@gmail.com>
* cpu-ia64-opc.c (ext_imms_scaled): Avoid undefined left shift
of negative values by using unsigned vars.
2019-12-07 Alan Modra <amodra@gmail.com>
PR 25236

6
bfd/cpu-ia64-opc.c
View File

@ -186,7 +186,7 @@ ext_imms_scaled (const struct ia64_operand *self, ia64_insn code,
ia64_insn *valuep, int scale)
{
int i, bits = 0, total = 0;
BFD_HOST_64_BIT val = 0, sign;
BFD_HOST_U_64_BIT val = 0, sign;
for (i = 0; i < NELEMS (self->field) && self->field[i].bits; ++i)
{
@ -196,10 +196,10 @@ ext_imms_scaled (const struct ia64_operand *self, ia64_insn code,
total += bits;
}
/* sign extend: */
sign = (BFD_HOST_64_BIT) 1 << (total - 1);
sign = (BFD_HOST_U_64_BIT) 1 << (total - 1);
val = (val ^ sign) - sign;
*valuep = (val << scale);
*valuep = val << scale;
return 0;
}