Commit e27f71e5 authored Jul 31, 2017 by Matt Brown Committed by Michael Ellerman Aug 10, 2017

powerpc/lib/sstep: Add isel instruction emulation



This adds emulation for the isel instruction.
Tested for correctness against the isel instruction and its extended
mnemonics (lt, gt, eq) 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>

parent 2c979c48

arch/powerpc/lib/sstep.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -1255,6 +1255,14 @@ int analyse_instr(struct instruction_op op, struct pt_regs regs,
		/*
		* Logical instructions
		*/
		case 15: /* isel */
		mb = (instr >> 6) & 0x1f; /* bc */
		val = (regs->ccr >> (31 - mb)) & 1;
		val2 = (ra) ? regs->gpr[ra] : 0;

		regs->gpr[rd] = (val) ? val2 : regs->gpr[rb];
		goto logical_done;

		case 26: /* cntlzw */
		asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) :
		"r" (regs->gpr[rd]));