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Commit c1771216 authored by Leonid Yegoshin's avatar Leonid Yegoshin Committed by Ralf Baechle
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MIPS: kernel: unaligned: Handle unaligned accesses for EVA 



Handle unaligned accesses when we access userspace memory
EVA mode.

Signed-off-by: default avatarLeonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent 9d8e5736

arch/mips/kernel/unaligned.c

+85 −1
Original line number Diff line number Diff line
@@ -431,7 +431,9 @@ static void emulate_load_store_insn(struct pt_regs *regs, 
	unsigned long origpc;

	unsigned long orig31;

	void __user *fault_addr = NULL;



#ifdef	CONFIG_EVA

	mm_segment_t seg;

#endif

	origpc = (unsigned long)pc;

	orig31 = regs->regs[31];
@@ -476,6 +478,88 @@ static void emulate_load_store_insn(struct pt_regs *regs, 
		 * The remaining opcodes are the ones that are really of

		 * interest.

		 */

#ifdef CONFIG_EVA

	case spec3_op:

		/*

		 * we can land here only from kernel accessing user memory,

		 * so we need to "switch" the address limit to user space, so

		 * address check can work properly.

		 */

		seg = get_fs();

		set_fs(USER_DS);

		switch (insn.spec3_format.func) {

		case lhe_op:

			if (!access_ok(VERIFY_READ, addr, 2)) {

				set_fs(seg);

				goto sigbus;

			}

			LoadHW(addr, value, res);

			if (res) {

				set_fs(seg);

				goto fault;

			}

			compute_return_epc(regs);

			regs->regs[insn.spec3_format.rt] = value;

			break;

		case lwe_op:

			if (!access_ok(VERIFY_READ, addr, 4)) {

				set_fs(seg);

				goto sigbus;

			}

				LoadW(addr, value, res);

			if (res) {

				set_fs(seg);

				goto fault;

			}

			compute_return_epc(regs);

			regs->regs[insn.spec3_format.rt] = value;

			break;

		case lhue_op:

			if (!access_ok(VERIFY_READ, addr, 2)) {

				set_fs(seg);

				goto sigbus;

			}

			LoadHWU(addr, value, res);

			if (res) {

				set_fs(seg);

				goto fault;

			}

			compute_return_epc(regs);

			regs->regs[insn.spec3_format.rt] = value;

			break;

		case she_op:

			if (!access_ok(VERIFY_WRITE, addr, 2)) {

				set_fs(seg);

				goto sigbus;

			}

			compute_return_epc(regs);

			value = regs->regs[insn.spec3_format.rt];

			StoreHW(addr, value, res);

			if (res) {

				set_fs(seg);

				goto fault;

			}

			break;

		case swe_op:

			if (!access_ok(VERIFY_WRITE, addr, 4)) {

				set_fs(seg);

				goto sigbus;

			}

			compute_return_epc(regs);

			value = regs->regs[insn.spec3_format.rt];

			StoreW(addr, value, res);

			if (res) {

				set_fs(seg);

				goto fault;

			}

			break;

		default:

			set_fs(seg);

			goto sigill;

		}

		set_fs(seg);

		break;

#endif

	case lh_op:

		if (!access_ok(VERIFY_READ, addr, 2))

			goto sigbus;