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| author | Sandipan Das <sandipan@linux.ibm.com> | 2019-02-22 12:23:28 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-26 00:05:17 +1100 |
| commit | a23987ef267a3549667fed5d69c0174e7fc15910 (patch) | |
| tree | 141c27f8779c90fb1b8bcb11dddb5fa59fdca234 /arch | |
| parent | 930d6288a26787d2e7f633705434171a506db9c5 (diff) | |
| download | linux-a23987ef267a3549667fed5d69c0174e7fc15910.tar.gz linux-a23987ef267a3549667fed5d69c0174e7fc15910.tar.bz2 linux-a23987ef267a3549667fed5d69c0174e7fc15910.zip | |
powerpc: sstep: Add support for darn instruction
This adds emulation support for the following integer instructions:
* Deliver A Random Number (darn)
As suggested by Michael, this uses a raw .long for specifying the
instruction word when using inline assembly to retain compatibility
with older binutils.
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 67e69ebd6c00..ab575e02f9b8 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1728,6 +1728,28 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, (int) regs->gpr[rb]; goto arith_done; + case 755: /* darn */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return -1; + switch (ra & 0x3) { + case 0: + /* 32-bit conditioned */ + asm volatile(PPC_DARN(%0, 0) : "=r" (op->val)); + goto compute_done; + + case 1: + /* 64-bit conditioned */ + asm volatile(PPC_DARN(%0, 1) : "=r" (op->val)); + goto compute_done; + + case 2: + /* 64-bit raw */ + asm volatile(PPC_DARN(%0, 2) : "=r" (op->val)); + goto compute_done; + } + + return -1; + /* * Logical instructions |