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powerpc: Don't update CR0 in emulation of popcnt, prty, bpermd instructions

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The architecture shows the least-significant bit of the instruction
word as reserved for the popcnt[bwd], prty[wd] and bpermd
instructions, that is, these instructions never update CR0.
Therefore this changes the emulation of these instructions to
skip the CR0 update.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras 2017-08-30 14:12:30 +10:00 committed by Michael Ellerman
parent f1bbb99f41
commit 5762e08344
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/lib/sstep.c
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@ -1469,7 +1469,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
case 122: /* popcntb */
do_popcnt(regs, op, regs->gpr[rd], 8);
goto logical_done;
goto logical_done_nocc;
case 124: /* nor */
op->val = ~(regs->gpr[rd] | regs->gpr[rb]);
@ -1477,15 +1477,15 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
case 154: /* prtyw */
do_prty(regs, op, regs->gpr[rd], 32);
goto logical_done;
goto logical_done_nocc;
case 186: /* prtyd */
do_prty(regs, op, regs->gpr[rd], 64);
goto logical_done;
goto logical_done_nocc;
#ifdef CONFIG_PPC64
case 252: /* bpermd */
do_bpermd(regs, op, regs->gpr[rd], regs->gpr[rb]);
goto logical_done;
goto logical_done_nocc;
#endif
case 284: /* xor */
op->val = ~(regs->gpr[rd] ^ regs->gpr[rb]);
@ -1497,7 +1497,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
case 378: /* popcntw */
do_popcnt(regs, op, regs->gpr[rd], 32);
goto logical_done;
goto logical_done_nocc;
case 412: /* orc */
op->val = regs->gpr[rd] | ~regs->gpr[rb];
@ -1513,7 +1513,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
#ifdef CONFIG_PPC64
case 506: /* popcntd */
do_popcnt(regs, op, regs->gpr[rd], 64);
goto logical_done;
goto logical_done_nocc;
#endif
case 922: /* extsh */
op->val = (signed short) regs->gpr[rd];