powerpc sstep: Add support for cnttzw, cnttzd instructions (32628b5c) · Commits · 戴 / test

This adds emulation support for the following integer instructions: * Count Trailing Zeros Word (cnttzw[.]) * Count Trailing Zeros Doubleword (cnttzd[.]) Signed-off-by:

Sandipan Das <sandipan@linux.ibm.com> Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/lib/sstep.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -1819,6 +1819,20 @@ int analyse_instr(struct instruction_op op, const struct pt_regs regs,
		case 506: /* popcntd */
		do_popcnt(regs, op, regs->gpr[rd], 64);
		goto logical_done_nocc;
		#endif
		case 538: /* cnttzw */
		if (!cpu_has_feature(CPU_FTR_ARCH_300))
		return -1;
		val = (unsigned int) regs->gpr[rd];
		op->val = (val ? __builtin_ctz(val) : 32);
		goto logical_done;
		#ifdef __powerpc64__
		case 570: /* cnttzd */
		if (!cpu_has_feature(CPU_FTR_ARCH_300))
		return -1;
		val = regs->gpr[rd];
		op->val = (val ? __builtin_ctzl(val) : 64);
		goto logical_done;
		#endif
		case 922: /* extsh */
		op->val = (signed short) regs->gpr[rd];

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