[PATCH 3/5] powerpc/lib/sstep: Add bpermd instruction emulation
Matt Brown
matthew.brown.dev at gmail.com
Thu Jul 13 13:25:46 AEST 2017
This adds emulation for the bpermd instruction.
Signed-off-by: Matt Brown <matthew.brown.dev at gmail.com>
---
arch/powerpc/lib/sstep.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index cf69987..603654d 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -637,6 +637,21 @@ static nokprobe_inline void do_popcnt(struct pt_regs *regs, unsigned long v1,
regs->gpr[ra] = out_val;
}
+static nokprobe_inline void do_bpermd(struct pt_regs *regs, unsigned long v1,
+ unsigned long v2, int ra)
+{
+ unsigned int idx, i;
+ unsigned char perm;
+
+ perm = 0x0;
+ for (i = 0; i < 8; i++) {
+ idx = (v1 >> (i * 8)) & 0xff;
+ if (idx < 64)
+ perm |= (v2 & (1 << idx)) >> (idx - i);
+ }
+ regs->gpr[ra] = 0 | perm;
+}
+
static nokprobe_inline int trap_compare(long v1, long v2)
{
int ret = 0;
@@ -1274,6 +1289,14 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs,
goto logical_done;
#endif
+#ifdef __powerpc64__
+ case 2396736: /* bpermd */
+ val = regs->gpr[rd];
+ val2 = regs->gpr[rb];
+ do_bpermd(regs, val, val2, ra);
+ goto logical_done;
+#endif
+
/*
* Shift instructions
*/
--
2.9.3
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