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| author | Matt Brown <matthew.brown.dev@gmail.com> | 2017-07-31 03:58:26 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-10 15:30:29 +0300 |
| commit | e27f71e5ff3c2ec5db96fc9aeb831b7bb31e3b6d (patch) | |
| tree | 3c8bd30afa1de473dfb0fe251e7acd034cd3db9c /arch/powerpc/lib/sstep.c | |
| parent | 2c979c489fee0e6b418133a9d0b938f02f47232a (diff) | |
| download | linux-e27f71e5ff3c2ec5db96fc9aeb831b7bb31e3b6d.tar.xz | |
powerpc/lib/sstep: Add isel instruction emulation
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>
Diffstat (limited to 'arch/powerpc/lib/sstep.c')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index a2ded89db73e..a85b82c0e3f3 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1255,6 +1255,14 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs, /* * 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 */ asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) : "r" (regs->gpr[rd])); |