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Commit 84fef630 authored by Markos Chandras's avatar Markos Chandras
Browse files

MIPS: Emulate the new MIPS R6 BALC instruction 



MIPS R6 uses the <R6 swc2 opcode for the new BALC instructions.

Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent 10d962d5

arch/mips/include/uapi/asm/inst.h

+1 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ enum major_op { 
	sdl_op, sdr_op, swr_op, cache_op,

	ll_op, lwc1_op, lwc2_op, bc6_op = lwc2_op, pref_op,

	lld_op, ldc1_op, ldc2_op, ld_op,

	sc_op, swc1_op, swc2_op, major_3b_op,

	sc_op, swc1_op, swc2_op, balc6_op = swc2_op, major_3b_op,

	scd_op, sdc1_op, sdc2_op, sd_op

};

arch/mips/kernel/branch.c

+10 −0
Original line number Diff line number Diff line
@@ -789,6 +789,16 @@ int __compute_return_epc_for_insn(struct pt_regs *regs, 
		}

		regs->cp0_epc += 8;

		break;

	case balc6_op:

		if (!cpu_has_mips_r6) {

			ret = -SIGILL;

			break;

		}

		/* Compact branch: BALC */

		regs->regs[31] = epc + 4;

		epc += 4 + (insn.i_format.simmediate << 2);

		regs->cp0_epc = epc;

		break;

#endif

	case cbcond0_op:

	case cbcond1_op:

arch/mips/math-emu/cp1emu.c

+8 −0
Original line number Diff line number Diff line
@@ -670,6 +670,14 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, 
		*contpc = regs->cp0_epc + dec_insn.pc_inc +

			dec_insn.next_pc_inc;



		return 1;

	case balc6_op:

		if (!cpu_has_mips_r6)

			break;

		regs->regs[31] = regs->cp0_epc + 4;

		*contpc = regs->cp0_epc + dec_insn.pc_inc +

			dec_insn.next_pc_inc;



		return 1;

#endif

	case cop0_op: