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| author | Sandipan Das <sandipan@linux.ibm.com> | 2019-02-22 09:53:29 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-25 16:05:17 +0300 |
| commit | 32628b5cf3bcdf31d7e00b0e8229051ee2afe96e (patch) | |
| tree | eff0fafa6b77197669758dd1698a0efab2784b3d /arch/powerpc | |
| parent | a23987ef267a3549667fed5d69c0174e7fc15910 (diff) | |
| download | linux-32628b5cf3bcdf31d7e00b0e8229051ee2afe96e.tar.xz | |
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>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index ab575e02f9b8..94189da4c159 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1820,6 +1820,20 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, 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]; goto logical_done; |