Commit 2c979c48 authored by Matt Brown's avatar Matt Brown Committed by Michael Ellerman

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: default avatarMatt Brown <matthew.brown.dev@gmail.com>
Reviewed-by: default avatarCyril Bur <cyrilbur@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent f312793d
......@@ -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);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment