Commit 5b75bd76 authored by Sathvika Vasireddy's avatar Sathvika Vasireddy Committed by Michael Ellerman
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powerpc/sstep: Add emulation support for ‘setb’ instruction 



This adds emulation support for the following instruction:
   * Set Boolean (setb)

Signed-off-by: default avatarSathvika Vasireddy <sathvika@linux.vnet.ibm.com>
Tested-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: default avatarSegher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7b735b0c898da0db2af8628a64df2f5114596f22.1620727160.git.sathvika@linux.vnet.ibm.com
parent f259fb89

arch/powerpc/lib/sstep.c

+22 −0
Original line number Diff line number Diff line
@@ -1700,6 +1700,28 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, 
			op->val = regs->ccr & imm;

			goto compute_done;



		case 128:	/* setb */

			if (!cpu_has_feature(CPU_FTR_ARCH_300))

				goto unknown_opcode;

			/*

			 * 'ra' encodes the CR field number (bfa) in the top 3 bits.

			 * Since each CR field is 4 bits,

			 * we can simply mask off the bottom two bits (bfa * 4)

			 * to yield the first bit in the CR field.

			 */

			ra = ra & ~0x3;

			/* 'val' stores bits of the CR field (bfa) */

			val = regs->ccr >> (CR0_SHIFT - ra);

			/* checks if the LT bit of CR field (bfa) is set */

			if (val & 8)

				op->val = -1;

			/* checks if the GT bit of CR field (bfa) is set */

			else if (val & 4)

				op->val = 1;

			else

				op->val = 0;

			goto compute_done;



		case 144:	/* mtcrf */

			op->type = COMPUTE + SETCC;

			imm = 0xf0000000UL;