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powerpc/lib/sstep: Add isel instruction emulation

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This adds emulation for the isel instruction.
Tested for correctness against the isel instruction and its extended
mnemonics (lt, gt, eq) on ppc64le.

Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com>
Reviewed-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Matt Brown 2017-07-31 10:58:26 +10:00 committed by Michael Ellerman
parent 2c979c489f
commit e27f71e5ff
1 changed files with 8 additions and 0 deletions
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arch/powerpc/lib/sstep.c
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@ -1255,6 +1255,14 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs,
/* /*
* Logical instructions * Logical instructions
*/ */
case 15: /* isel */
mb = (instr >> 6) & 0x1f; /* bc */
val = (regs->ccr >> (31 - mb)) & 1;
val2 = (ra) ? regs->gpr[ra] : 0;
regs->gpr[rd] = (val) ? val2 : regs->gpr[rb];
goto logical_done;
case 26: /* cntlzw */ case 26: /* cntlzw */
asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) : asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) :
"r" (regs->gpr[rd])); "r" (regs->gpr[rd]));