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udis86: Fix 16-bit jump offset decoding

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This commit is contained in:
Anton Kochkov 2014-02-17 02:30:36 +04:00
parent b81aaf3a30
commit 59651353dc
1 changed files with 6 additions and 1 deletions
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7
shlr/udis86/syn.c
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@ -94,7 +94,12 @@ ud_syn_rel_target(struct ud *u, struct ud_operand *opr)
const uint64_t trunc_mask = 0xffffffffffffffffull >> (64 - u->opr_mode);
switch (opr->size) {
case 8 : return (u->pc + opr->lval.sbyte) & trunc_mask;
case 16: return (u->pc + opr->lval.sword) & trunc_mask;
case 16: {
int delta = (opr->lval.sword & trunc_mask);
if ((u->pc + delta) > 0xffff)
return (u->pc & 0xf0000) + ((u->pc + delta) & 0xffff);
return (u->pc + delta);
}
case 32: return (u->pc + opr->lval.sdword) & trunc_mask;
default: UD_ASSERT(!"invalid relative offset size.");
return 0ull;