[PATCH 2/6] powerpc sstep: Add darn instruction emulation
From: Sandipan Das <hidden>
Date: 2018-09-03 15:19:53
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
This adds emulation support for the following integer instructions: * Deliver A Random Number (darn) Signed-off-by: Sandipan Das <redacted> --- arch/powerpc/lib/sstep.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index b40ec18515bd..18ac0a26c4fc 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c@@ -1728,6 +1728,25 @@ 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: + asm("darn %0,0" : "=r" (op->val)); + goto compute_done; + + case 1: + asm("darn %0,1" : "=r" (op->val)); + goto compute_done; + + case 2: + asm("darn %0,2" : "=r" (op->val)); + goto compute_done; + } + + return -1; + /* * Logical instructions
--
2.14.4