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Commit 2c979c48 authored by Matt Brown's avatar Matt Brown Committed by Michael Ellerman
Browse files

powerpc/lib/sstep: Add prty instruction emulation 



This adds emulation for the prtyw and prtyd instructions.
Tested for logical correctness against the prtyw and prtyd instructions
on ppc64le.

Signed-off-by: default avatarMatt Brown <matthew.brown.dev@gmail.com>
Reviewed-by: default avatarCyril Bur <cyrilbur@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent f312793d

arch/powerpc/lib/sstep.c

+26 −0
Original line number Diff line number Diff line
@@ -657,6 +657,24 @@ static nokprobe_inline void do_bpermd(struct pt_regs *regs, unsigned long v1, 
	regs->gpr[ra] = perm;

}

#endif /* CONFIG_PPC64 */

/*

 * The size parameter adjusts the equivalent prty instruction.

 * prtyw = 32, prtyd = 64

 */

static nokprobe_inline void do_prty(struct pt_regs *regs, unsigned long v,

				int size, int ra)

{

	unsigned long long res = v ^ (v >> 8);



	res ^= res >> 16;

	if (size == 32) {		/* prtyw */

		regs->gpr[ra] = res & 0x0000000100000001;

		return;

	}



	res ^= res >> 32;

	regs->gpr[ra] = res & 1;	/*prtyd */

}



static nokprobe_inline int trap_compare(long v1, long v2)

{
@@ -1262,6 +1280,14 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs, 
		case 124:	/* nor */

			regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);

			goto logical_done;



		case 154:	/* prtyw */

			do_prty(regs, regs->gpr[rd], 32, ra);

			goto logical_done;



		case 186:	/* prtyd */

			do_prty(regs, regs->gpr[rd], 64, ra);

			goto logical_done;

#ifdef CONFIG_PPC64

		case 252:	/* bpermd */

			do_bpermd(regs, regs->gpr[rd], regs->gpr[rb], ra);