Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

Pull MIPS updates from Ralf Baechle:
 "This is the main pull request for MIPS for 4.8.  Also includes is a
  minor SSB cleanup as SSB code traditionally is merged through the MIPS
  tree:

  ATH25:
    - MIPS: Add default configuration for ath25

  Boot:
    - For zboot, copy appended dtb to the end of the kernel
    - store the appended dtb address in a variable

  BPF:
    - Fix off by one error in offset allocation

  Cobalt code:
    - Fix typos

  Core code:
    - debugfs_create_file returns NULL on error, so don't use IS_ERR for
      testing for errors.
    - Fix double locking issue in RM7000 S-cache code.  This would only
      affect RM7000 ARC systems on reboot.
    - Fix page table corruption on THP permission changes.
    - Use compat_sys_keyctl for 32 bit userspace on 64 bit kernels.
      David says, there are no compatibility issues raised by this fix.
    - Move some signal code around.
    - Rewrite r4k count/compare clockevent device registration such that
      min_delta_ticks/max_delta_ticks files are guaranteed to be
      initialized.
    - Only register r4k count/compare as clockevent device if we can
      assume the clock to be constant.
    - Fix MSA asm warnings in control reg accessors
    - uasm and tlbex fixes and tweaking.
    - Print segment physical address when EU=1.
    - Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO.
    - CP: Allow booting by VP other than VP 0
    - Cache handling fixes and optimizations for r4k class caches
    - Add hotplug support for R6 processors
    - Cleanup hotplug bits in kconfig
    - traps: return correct si code for accessing nonmapped addresses
    - Remove cpu_has_safe_index_cacheops

  Lantiq:
    - Register IRQ handler for virtual IRQ number
    - Fix EIU interrupt loading code
    - Use the real EXIN count
    - Fix build error.

  Loongson 3:
    - Increase HPET_MIN_PROG_DELTA and decrease HPET_MIN_CYCLES

  Octeon:
    - Delete built-in DTB pruning code for D-Link DSR-1000N.
    - Clean up GPIO definitions in dlink_dsr-1000n.dts.
    - Add more LEDs to the DSR-100n DTS
    - Fix off by one in octeon_irq_gpio_map()
    - Typo fixes
    - Enable SATA by default in cavium_octeon_defconfig
    - Support readq/writeq()
    - Remove forced mappings of USB interrupts.
    - Ensure DMA descriptors are always in the low 4GB
    - Improve USB reset code for OCTEON II.

  Pistachio:
    - Add maintainers entry for pistachio SoC Support
    - Remove plat_setup_iocoherency

  Ralink:
    - Fix pwm UART in spis group pinmux.

  SSB:
    - Change bare unsigned to unsigned int to suit coding style

  Tools:
    - Fix reloc tool compiler warnings.

  Other:
    - Delete use of ARCH_WANT_OPTIONAL_GPIOLIB"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (61 commits)
  MIPS: mm: Fix definition of R6 cache instruction
  MIPS: tools: Fix relocs tool compiler warnings
  MIPS: Cobalt: Fix typo
  MIPS: Octeon: Fix typo
  MIPS: Lantiq: Fix build failure
  MIPS: Use CPHYSADDR to implement mips32 __pa
  MIPS: Octeon: Dlink_dsr-1000n.dts: add more leds.
  MIPS: Octeon: Clean up GPIO definitions in dlink_dsr-1000n.dts.
  MIPS: Octeon: Delete built-in DTB pruning code for D-Link DSR-1000N.
  MIPS: store the appended dtb address in a variable
  MIPS: ZBOOT: copy appended dtb to the end of the kernel
  MIPS: ralink: fix spis group pinmux
  MIPS: Factor o32 specific code into signal_o32.c
  MIPS: non-exec stack & heap when non-exec PT_GNU_STACK is present
  MIPS: Use per-mm page to execute branch delay slot instructions
  MIPS: Modify error handling
  MIPS: c-r4k: Use SMP calls for CM indexed cache ops
  MIPS: c-r4k: Avoid small flush_icache_range SMP calls
  MIPS: c-r4k: Local flush_icache_range cache op override
  MIPS: c-r4k: Split r4k_flush_kernel_vmap_range()
  ...

1 files changed, 92 insertions, 0 deletions

diff --git a/arch/mips/include/asm/dsemul.h b/arch/mips/include/asm/dsemul.h
new file mode 100644
index 000000000000..a6e067801f23
--- /dev/null
+++ b/arch/mips/include/asm/dsemul.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef __MIPS_ASM_DSEMUL_H__
+#define __MIPS_ASM_DSEMUL_H__
+
+#include <asm/break.h>
+#include <asm/inst.h>
+
+/* Break instruction with special math emu break code set */
+#define BREAK_MATH(micromips)	(((micromips) ? 0x7 : 0xd) | (BRK_MEMU << 16))
+
+/* When used as a frame index, indicates the lack of a frame */
+#define BD_EMUFRAME_NONE	((int)BIT(31))
+
+struct mm_struct;
+struct pt_regs;
+struct task_struct;
+
+/**
+ * mips_dsemul() - 'Emulate' an instruction from a branch delay slot
+ * @regs:	User thread register context.
+ * @ir:		The instruction to be 'emulated'.
+ * @branch_pc:	The PC of the branch instruction.
+ * @cont_pc:	The PC to continue at following 'emulation'.
+ *
+ * Emulate or execute an arbitrary MIPS instruction within the context of
+ * the current user thread. This is used primarily to handle instructions
+ * in the delay slots of emulated branch instructions, for example FP
+ * branch instructions on systems without an FPU.
+ *
+ * Return: Zero on success, negative if ir is a NOP, signal number on failure.
+ */
+extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
+		       unsigned long branch_pc, unsigned long cont_pc);
+
+/**
+ * do_dsemulret() - Return from a delay slot 'emulation' frame
+ * @xcp:	User thread register context.
+ *
+ * Call in response to the BRK_MEMU break instruction used to return to
+ * the kernel from branch delay slot 'emulation' frames following a call
+ * to mips_dsemul(). Restores the user thread PC to the value that was
+ * passed as the cpc parameter to mips_dsemul().
+ *
+ * Return: True if an emulation frame was returned from, else false.
+ */
+extern bool do_dsemulret(struct pt_regs *xcp);
+
+/**
+ * dsemul_thread_cleanup() - Cleanup thread 'emulation' frame
+ * @tsk: The task structure associated with the thread
+ *
+ * If the thread @tsk has a branch delay slot 'emulation' frame
+ * allocated to it then free that frame.
+ *
+ * Return: True if a frame was freed, else false.
+ */
+extern bool dsemul_thread_cleanup(struct task_struct *tsk);
+
+/**
+ * dsemul_thread_rollback() - Rollback from an 'emulation' frame
+ * @regs:	User thread register context.
+ *
+ * If the current thread, whose register context is represented by @regs,
+ * is executing within a delay slot 'emulation' frame then exit that
+ * frame. The PC will be rolled back to the branch if the instruction
+ * that was being 'emulated' has not yet executed, or advanced to the
+ * continuation PC if it has.
+ *
+ * Return: True if a frame was exited, else false.
+ */
+extern bool dsemul_thread_rollback(struct pt_regs *regs);
+
+/**
+ * dsemul_mm_cleanup() - Cleanup per-mm delay slot 'emulation' state
+ * @mm:		The struct mm_struct to cleanup state for.
+ *
+ * Cleanup state for the given @mm, ensuring that any memory allocated
+ * for delay slot 'emulation' book-keeping is freed. This is to be called
+ * before @mm is freed in order to avoid memory leaks.
+ */
+extern void dsemul_mm_cleanup(struct mm_struct *mm);
+
+#endif /* __MIPS_ASM_DSEMUL_H__ */