powerpc: sstep: Add support for darn instruction (a23987ef) · Commits · 戴 / test

This adds emulation support for the following integer instructions: * Deliver A Random Number (darn) As suggested by Michael, this uses a raw .long for specifying the instruction word when using inline assembly to retain compatibility with older binutils. Signed-off-by:

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

Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/lib/sstep.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -1728,6 +1728,28 @@ 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:
		/* 32-bit conditioned */
		asm volatile(PPC_DARN(%0, 0) : "=r" (op->val));
		goto compute_done;

		case 1:
		/* 64-bit conditioned */
		asm volatile(PPC_DARN(%0, 1) : "=r" (op->val));
		goto compute_done;

		case 2:
		/* 64-bit raw */
		asm volatile(PPC_DARN(%0, 2) : "=r" (op->val));
		goto compute_done;
		}

		return -1;


		/*
		* Logical instructions

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