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powerpc sstep: Add support for cnttzw, cnttzd instructions 

This adds emulation support for the following integer instructions:
  * Count Trailing Zeros Word (cnttzw[.])
  * Count Trailing Zeros Doubleword (cnttzd[.])

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sandipan Das 2019-02-22 12:23:29 +05:30 committed by Michael Ellerman
parent a23987ef26
commit 32628b5cf3
1 changed files with 14 additions and 0 deletions
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14
arch/powerpc/lib/sstep.c
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@ -1819,6 +1819,20 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
case 506: /* popcntd */
do_popcnt(regs, op, regs->gpr[rd], 64);
goto logical_done_nocc;
#endif
case 538: /* cnttzw */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -1;
val = (unsigned int) regs->gpr[rd];
op->val = (val ? __builtin_ctz(val) : 32);
goto logical_done;
#ifdef __powerpc64__
case 570: /* cnttzd */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -1;
val = regs->gpr[rd];
op->val = (val ? __builtin_ctzl(val) : 64);
goto logical_done;
#endif
case 922: /* extsh */
op->val = (signed short) regs->gpr[rd];