Commit 151c32bf authored Jul 28, 2020 by Balamuruhan S Committed by Michael Ellerman Jul 29, 2020

powerpc/sstep: Add support for divde[.] and divdeu[.] instructions



This patch adds emulation support for divde, divdeu instructions,
  - Divide Doubleword Extended (divde[.])
  - Divide Doubleword Extended Unsigned (divdeu[.])

Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200728130308.1790982-3-bala24@linux.ibm.com

parent 8902c6f9

arch/powerpc/lib/sstep.c

+12 −1

Original line number	Diff line number	Diff line
		@@ -1806,7 +1806,18 @@ int analyse_instr(struct instruction_op op, const struct pt_regs regs,
		op->val = (int) regs->gpr[ra] /
		(int) regs->gpr[rb];
		goto arith_done;

		#ifdef __powerpc64__
		case 425: /* divde[.] */
		asm volatile(PPC_DIVDE(%0, %1, %2) :
		"=r" (op->val) : "r" (regs->gpr[ra]),
		"r" (regs->gpr[rb]));
		goto arith_done;
		case 393: /* divdeu[.] */
		asm volatile(PPC_DIVDEU(%0, %1, %2) :
		"=r" (op->val) : "r" (regs->gpr[ra]),
		"r" (regs->gpr[rb]));
		goto arith_done;
		#endif
		case 755: /* darn */
		if (!cpu_has_feature(CPU_FTR_ARCH_300))
		return -1;