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powerpc/lib/sstep: Add prty instruction emulation 

This adds emulation for the prtyw and prtyd instructions.
Tested for logical correctness against the prtyw and prtyd instructions
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 10:58:25 +10:00 committed by Michael Ellerman
parent f312793dda
commit 2c979c489f
1 changed files with 26 additions and 0 deletions
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26
arch/powerpc/lib/sstep.c
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@ -657,6 +657,24 @@ static nokprobe_inline void do_bpermd(struct pt_regs *regs, unsigned long v1,
regs->gpr[ra] = perm;
}
#endif /* CONFIG_PPC64 */
/*
* The size parameter adjusts the equivalent prty instruction.
* prtyw = 32, prtyd = 64
*/
static nokprobe_inline void do_prty(struct pt_regs *regs, unsigned long v,
int size, int ra)
{
unsigned long long res = v ^ (v >> 8);
res ^= res >> 16;
if (size == 32) { /* prtyw */
regs->gpr[ra] = res & 0x0000000100000001;
return;
}
res ^= res >> 32;
regs->gpr[ra] = res & 1; /*prtyd */
}
static nokprobe_inline int trap_compare(long v1, long v2)
{
@ -1262,6 +1280,14 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs,
case 124: /* nor */
regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);
goto logical_done;
case 154: /* prtyw */
do_prty(regs, regs->gpr[rd], 32, ra);
goto logical_done;
case 186: /* prtyd */
do_prty(regs, regs->gpr[rd], 64, ra);
goto logical_done;
#ifdef CONFIG_PPC64
case 252: /* bpermd */
do_bpermd(regs, regs->gpr[rd], regs->gpr[rb], ra);