arch: remove frv port

The Fujitsu FRV kernel port has been around for a long time, but has not
seen regular updates in several years and instead was marked 'Orphaned'
in 2016 by long-time maintainer David Howells.

The SoC product line apparently is apparently still around in the form
of the Socionext Milbeaut image processor, but this one no longer uses
the FRV CPU cores.

This removes all FRV specific files from the kernel.

Link: http://www.socionext.com/en/products/assp/milbeaut/
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

41 files changed, 0 insertions, 13795 deletions

diff --git a/arch/frv/kernel/.gitignore b/arch/frv/kernel/.gitignore
deleted file mode 100644
index c5f676c3c224..000000000000
--- a/arch/frv/kernel/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-vmlinux.lds
diff --git a/arch/frv/kernel/Makefile b/arch/frv/kernel/Makefile
deleted file mode 100644
index 216ddf30c3c1..000000000000
--- a/arch/frv/kernel/Makefile
+++ /dev/null
@@ -1,24 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for the linux kernel.
-#
-
-heads-y				:= head-uc-fr401.o head-uc-fr451.o head-uc-fr555.o
-heads-$(CONFIG_MMU)		:= head-mmu-fr451.o
-
-extra-y:= head.o vmlinux.lds
-
-obj-y := $(heads-y) entry.o entry-table.o break.o switch_to.o \
-	 process.o traps.o ptrace.o signal.o dma.o \
-	 sys_frv.o time.o setup.o frv_ksyms.o \
-	 debug-stub.o irq.o sleep.o uaccess.o
-
-obj-$(CONFIG_GDBSTUB)		+= gdb-stub.o gdb-io.o
-
-obj-$(CONFIG_MB93091_VDK)	+= irq-mb93091.o
-obj-$(CONFIG_PM)		+= pm.o cmode.o
-obj-$(CONFIG_MB93093_PDK)	+= pm-mb93093.o
-obj-$(CONFIG_FUJITSU_MB93493)	+= irq-mb93493.o
-obj-$(CONFIG_SYSCTL)		+= sysctl.o
-obj-$(CONFIG_FUTEX)		+= futex.o
-obj-$(CONFIG_MODULES)		+= module.o
diff --git a/arch/frv/kernel/asm-offsets.c b/arch/frv/kernel/asm-offsets.c
deleted file mode 100644
index 0a468e9b51ad..000000000000
--- a/arch/frv/kernel/asm-offsets.c
+++ /dev/null
@@ -1,96 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Generate definitions needed by assembly language modules.
- * This code generates raw asm output which is post-processed
- * to extract and format the required data.
- */
-
-#include <linux/sched.h>
-#include <linux/signal.h>
-#include <linux/personality.h>
-#include <linux/kbuild.h>
-#include <asm/registers.h>
-#include <asm/ucontext.h>
-#include <asm/processor.h>
-#include <asm/thread_info.h>
-#include <asm/gdb-stub.h>
-
-#define DEF_PTREG(sym, reg) OFFSET(sym, pt_regs, reg)
-#define DEF_IREG(sym, reg) OFFSET(sym, user_context, reg)
-#define DEF_FREG(sym, reg) OFFSET(sym, user_context, reg)
-#define DEF_0REG(sym, reg) OFFSET(sym, frv_frame0, reg)
-
-void foo(void)
-{
-	/* offsets into the thread_info structure */
-	OFFSET(TI_TASK,			thread_info, task);
-	OFFSET(TI_FLAGS,		thread_info, flags);
-	OFFSET(TI_STATUS,		thread_info, status);
-	OFFSET(TI_CPU,			thread_info, cpu);
-	OFFSET(TI_PREEMPT_COUNT,	thread_info, preempt_count);
-	OFFSET(TI_ADDR_LIMIT,		thread_info, addr_limit);
-	BLANK();
-
-	/* offsets into register file storage */
-	DEF_PTREG(REG_PSR,		psr);
-	DEF_PTREG(REG_ISR,		isr);
-	DEF_PTREG(REG_CCR,		ccr);
-	DEF_PTREG(REG_CCCR,		cccr);
-	DEF_PTREG(REG_LR,		lr);
-	DEF_PTREG(REG_LCR,		lcr);
-	DEF_PTREG(REG_PC,		pc);
-	DEF_PTREG(REG__STATUS,		__status);
-	DEF_PTREG(REG_SYSCALLNO,	syscallno);
-	DEF_PTREG(REG_ORIG_GR8,		orig_gr8);
-	DEF_PTREG(REG_GNER0,		gner0);
-	DEF_PTREG(REG_GNER1,		gner1);
-	DEF_PTREG(REG_IACC0,		iacc0);
-	DEF_PTREG(REG_TBR,		tbr);
-	DEF_PTREG(REG_GR0,		tbr);
-	DEFINE(REG__END,		sizeof(struct pt_regs));
-	BLANK();
-
-	DEF_0REG(REG_DCR,		debug.dcr);
-	DEF_0REG(REG_IBAR0,		debug.ibar[0]);
-	DEF_0REG(REG_DBAR0,		debug.dbar[0]);
-	DEF_0REG(REG_DBDR00,		debug.dbdr[0][0]);
-	DEF_0REG(REG_DBMR00,		debug.dbmr[0][0]);
-	BLANK();
-
-	DEF_IREG(__INT_GR0,		i.gr[0]);
-	DEF_FREG(__USER_FPMEDIA,	f);
-	DEF_FREG(__FPMEDIA_FR0,		f.fr[0]);
-	DEF_FREG(__FPMEDIA_FNER0,	f.fner[0]);
-	DEF_FREG(__FPMEDIA_MSR0,	f.msr[0]);
-	DEF_FREG(__FPMEDIA_ACC0,	f.acc[0]);
-	DEF_FREG(__FPMEDIA_ACCG0,	f.accg[0]);
-	DEF_FREG(__FPMEDIA_FSR0,	f.fsr[0]);
-	BLANK();
-
-	DEFINE(NR_PT_REGS,		sizeof(struct pt_regs) / 4);
-	DEFINE(NR_USER_INT_REGS,	sizeof(struct user_int_regs) / 4);
-	DEFINE(NR_USER_FPMEDIA_REGS,	sizeof(struct user_fpmedia_regs) / 4);
-	DEFINE(NR_USER_CONTEXT,		sizeof(struct user_context) / 4);
-	DEFINE(FRV_FRAME0_SIZE,		sizeof(struct frv_frame0));
-	BLANK();
-
-	/* offsets into thread_struct */
-	OFFSET(__THREAD_FRAME,		thread_struct, frame);
-	OFFSET(__THREAD_CURR,		thread_struct, curr);
-	OFFSET(__THREAD_SP,		thread_struct, sp);
-	OFFSET(__THREAD_FP,		thread_struct, fp);
-	OFFSET(__THREAD_LR,		thread_struct, lr);
-	OFFSET(__THREAD_PC,		thread_struct, pc);
-	OFFSET(__THREAD_GR16,		thread_struct, gr[0]);
-	OFFSET(__THREAD_SCHED_LR,	thread_struct, sched_lr);
-	OFFSET(__THREAD_FRAME0,		thread_struct, frame0);
-	OFFSET(__THREAD_USER,		thread_struct, user);
-	BLANK();
-
-	/* offsets into frv_debug_status */
-	OFFSET(DEBUG_BPSR,		frv_debug_status, bpsr);
-	OFFSET(DEBUG_DCR,		frv_debug_status, dcr);
-	OFFSET(DEBUG_BRR,		frv_debug_status, brr);
-	OFFSET(DEBUG_NMAR,		frv_debug_status, nmar);
-	BLANK();
-}
diff --git a/arch/frv/kernel/break.S b/arch/frv/kernel/break.S
deleted file mode 100644
index cbb6958a3147..000000000000
--- a/arch/frv/kernel/break.S
+++ /dev/null
@@ -1,792 +0,0 @@
-/* break.S: Break interrupt handling (kept separate from entry.S)
- *
- * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.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.
- */
-
-#include <linux/linkage.h>
-#include <asm/setup.h>
-#include <asm/segment.h>
-#include <asm/ptrace.h>
-#include <asm/thread_info.h>
-#include <asm/spr-regs.h>
-
-#include <asm/errno.h>
-
-#
-# the break handler has its own stack
-#
-	.section	.bss..stack
-	.globl		__break_user_context
-	.balign		THREAD_SIZE
-__break_stack:
-	.space		THREAD_SIZE - FRV_FRAME0_SIZE
-__break_frame_0:
-	.space		FRV_FRAME0_SIZE
-
-#
-# miscellaneous variables
-#
-	.section	.bss
-#ifdef CONFIG_MMU
-	.globl		__break_tlb_miss_real_return_info
-__break_tlb_miss_real_return_info:
-	.balign		8
-	.space		2*4			/* saved PCSR, PSR for TLB-miss handler fixup */
-#endif
-
-__break_trace_through_exceptions:
-	.space		4
-
-#define CS2_ECS1	0xe1200000
-#define CS2_USERLED	0x4
-
-.macro LEDS val,reg
-#	sethi.p		%hi(CS2_ECS1+CS2_USERLED),gr30
-#	setlo		%lo(CS2_ECS1+CS2_USERLED),gr30
-#	setlos		#~\val,\reg
-#	st		\reg,@(gr30,gr0)
-#	setlos		#0x5555,\reg
-#	sethi.p		%hi(0xffc00100),gr30
-#	setlo		%lo(0xffc00100),gr30
-#	sth		\reg,@(gr30,gr0)
-#	membar
-.endm
-
-###############################################################################
-#
-# entry point for Break Exceptions/Interrupts
-#
-###############################################################################
-	.section	.text..break
-	.balign		4
-	.globl		__entry_break
-__entry_break:
-#ifdef CONFIG_MMU
-	movgs		gr31,scr3
-#endif
-	LEDS		0x1001,gr31
-
-	sethi.p		%hi(__break_frame_0),gr31
-	setlo		%lo(__break_frame_0),gr31
-
-	stdi		gr2,@(gr31,#REG_GR(2))
-	movsg		ccr,gr3
-	sti		gr3,@(gr31,#REG_CCR)
-
-	# catch the return from a TLB-miss handler that had single-step disabled
-	# traps will be enabled, so we have to do this now
-#ifdef CONFIG_MMU
-	movsg		bpcsr,gr3
-	sethi.p		%hi(__break_tlb_miss_return_breaks_here),gr2
-	setlo		%lo(__break_tlb_miss_return_breaks_here),gr2
-	subcc		gr2,gr3,gr0,icc0
-	beq		icc0,#2,__break_return_singlestep_tlbmiss
-#endif
-
-	# determine whether we have stepped through into an exception
-	# - we need to take special action to suspend h/w single stepping if we've done
-	#   that, so that the gdbstub doesn't get bogged down endlessly stepping through
-	#   external interrupt handling
-	movsg		bpsr,gr3
-	andicc		gr3,#BPSR_BET,gr0,icc0
-	bne		icc0,#2,__break_maybe_userspace	/* jump if PSR.ET was 1 */
-
-	LEDS		0x1003,gr2
-
-	movsg		brr,gr3
-	andicc		gr3,#BRR_ST,gr0,icc0
-	andicc.p	gr3,#BRR_SB,gr0,icc1
-	bne		icc0,#2,__break_step		/* jump if single-step caused break */
-	beq		icc1,#2,__break_continue	/* jump if BREAK didn't cause break */
-
-	LEDS		0x1007,gr2
-
-	# handle special breaks
-	movsg		bpcsr,gr3
-
-	sethi.p		%hi(__entry_return_singlestep_breaks_here),gr2
-	setlo		%lo(__entry_return_singlestep_breaks_here),gr2
-	subcc		gr2,gr3,gr0,icc0
-	beq		icc0,#2,__break_return_singlestep
-
-	bra		__break_continue
-
-
-###############################################################################
-#
-# handle BREAK instruction in kernel-mode exception epilogue
-#
-###############################################################################
-__break_return_singlestep:
-	LEDS		0x100f,gr2
-
-	# special break insn requests single-stepping to be turned back on
-	#		HERE		RETT
-	# PSR.ET	0		0
-	# PSR.PS	old PSR.S	?
-	# PSR.S		1		1
-	# BPSR.ET	0		1 (can't have caused orig excep otherwise)
-	# BPSR.BS	1		old PSR.S
-	movsg		dcr,gr2
-	sethi.p		%hi(DCR_SE),gr3
-	setlo		%lo(DCR_SE),gr3
-	or		gr2,gr3,gr2
-	movgs		gr2,dcr
-
-	movsg		psr,gr2
-	andi		gr2,#PSR_PS,gr2
-	slli		gr2,#11,gr2			/* PSR.PS -> BPSR.BS */
-	ori		gr2,#BPSR_BET,gr2		/* 1 -> BPSR.BET */
-	movgs		gr2,bpsr
-
-	# return to the invoker of the original kernel exception
-	movsg		pcsr,gr2
-	movgs		gr2,bpcsr
-
-	LEDS		0x101f,gr2
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	lddi.p		@(gr31,#REG_GR(2)),gr2
-	xor		gr31,gr31,gr31
-	movgs		gr0,brr
-#ifdef CONFIG_MMU
-	movsg		scr3,gr31
-#endif
-	rett		#1
-
-###############################################################################
-#
-# handle BREAK instruction in TLB-miss handler return path
-#
-###############################################################################
-#ifdef CONFIG_MMU
-__break_return_singlestep_tlbmiss:
-	LEDS		0x1100,gr2
-
-	sethi.p		%hi(__break_tlb_miss_real_return_info),gr3
-	setlo		%lo(__break_tlb_miss_real_return_info),gr3
-	lddi		@(gr3,#0),gr2
-	movgs		gr2,pcsr
-	movgs		gr3,psr
-
-	bra		__break_return_singlestep
-#endif
-
-
-###############################################################################
-#
-# handle single stepping into an exception prologue from kernel mode
-# - we try and catch it whilst it is still in the main vector table
-# - if we catch it there, we have to jump to the fixup handler
-#   - there is a fixup table that has a pointer for every 16b slot in the trap
-#     table
-#
-###############################################################################
-__break_step:
-	LEDS		0x2003,gr2
-
-	# external interrupts seem to escape from the trap table before single
-	# step catches up with them
-	movsg		bpcsr,gr2
-	sethi.p		%hi(__entry_kernel_external_interrupt),gr3
-	setlo		%lo(__entry_kernel_external_interrupt),gr3
-	subcc.p		gr2,gr3,gr0,icc0
-	sethi		%hi(__entry_uspace_external_interrupt),gr3
-	setlo.p		%lo(__entry_uspace_external_interrupt),gr3
-	beq		icc0,#2,__break_step_kernel_external_interrupt
-	subcc.p		gr2,gr3,gr0,icc0
-	sethi		%hi(__entry_kernel_external_interrupt_virtually_disabled),gr3
-	setlo.p		%lo(__entry_kernel_external_interrupt_virtually_disabled),gr3
-	beq		icc0,#2,__break_step_uspace_external_interrupt
-	subcc.p		gr2,gr3,gr0,icc0
-	sethi		%hi(__entry_kernel_external_interrupt_virtual_reenable),gr3
-	setlo.p		%lo(__entry_kernel_external_interrupt_virtual_reenable),gr3
-	beq		icc0,#2,__break_step_kernel_external_interrupt_virtually_disabled
-	subcc		gr2,gr3,gr0,icc0
-	beq		icc0,#2,__break_step_kernel_external_interrupt_virtual_reenable
-
-	LEDS		0x2007,gr2
-
-	# the two main vector tables are adjacent on one 8Kb slab
-	movsg		bpcsr,gr2
-	setlos		#0xffffe000,gr3
-	and		gr2,gr3,gr2
-	sethi.p		%hi(__trap_tables),gr3
-	setlo		%lo(__trap_tables),gr3
-	subcc		gr2,gr3,gr0,icc0
-	bne		icc0,#2,__break_continue
-
-	LEDS		0x200f,gr2
-
-	# skip workaround if so requested by GDB
-	sethi.p		%hi(__break_trace_through_exceptions),gr3
-	setlo		%lo(__break_trace_through_exceptions),gr3
-	ld		@(gr3,gr0),gr3
-	subcc		gr3,gr0,gr0,icc0
-	bne		icc0,#0,__break_continue
-
-	LEDS		0x201f,gr2
-
-	# access the fixup table - there's a 1:1 mapping between the slots in the trap tables and
-	# the slots in the trap fixup tables allowing us to simply divide the offset into the
-	# former by 4 to access the latter
-	sethi.p		%hi(__trap_tables),gr3
-	setlo		%lo(__trap_tables),gr3
-	movsg		bpcsr,gr2
-	sub		gr2,gr3,gr2
-	srli.p		gr2,#2,gr2
-
-	sethi		%hi(__trap_fixup_tables),gr3
-	setlo.p		%lo(__trap_fixup_tables),gr3
-	andi		gr2,#~3,gr2
-	ld		@(gr2,gr3),gr2
-	jmpil		@(gr2,#0)
-
-# step through an internal exception from kernel mode
-	.globl		__break_step_kernel_softprog_interrupt
-__break_step_kernel_softprog_interrupt:
-	sethi.p		%hi(__entry_kernel_softprog_interrupt_reentry),gr3
-	setlo		%lo(__entry_kernel_softprog_interrupt_reentry),gr3
-	bra		__break_return_as_kernel_prologue
-
-# step through an external interrupt from kernel mode
-	.globl		__break_step_kernel_external_interrupt
-__break_step_kernel_external_interrupt:
-	# deal with virtual interrupt disablement
-	beq		icc2,#0,__break_step_kernel_external_interrupt_virtually_disabled
-
-	sethi.p		%hi(__entry_kernel_external_interrupt_reentry),gr3
-	setlo		%lo(__entry_kernel_external_interrupt_reentry),gr3
-
-__break_return_as_kernel_prologue:
-	LEDS		0x203f,gr2
-
-	movgs		gr3,bpcsr
-
-	# do the bit we had to skip
-#ifdef CONFIG_MMU
-	movsg		ear0,gr2		/* EAR0 can get clobbered by gdb-stub (ICI/ICEI) */
-	movgs		gr2,scr2
-#endif
-
-	or.p		sp,gr0,gr2		/* set up the stack pointer */
-	subi		sp,#REG__END,sp
-	sti.p		gr2,@(sp,#REG_SP)
-
-	setlos		#REG__STATUS_STEP,gr2
-	sti		gr2,@(sp,#REG__STATUS)		/* record single step status */
-
-	# cancel single-stepping mode
-	movsg		dcr,gr2
-	sethi.p		%hi(~DCR_SE),gr3
-	setlo		%lo(~DCR_SE),gr3
-	and		gr2,gr3,gr2
-	movgs		gr2,dcr
-
-	LEDS		0x207f,gr2
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	lddi.p		@(gr31,#REG_GR(2)),gr2
-	xor		gr31,gr31,gr31
-	movgs		gr0,brr
-#ifdef CONFIG_MMU
-	movsg		scr3,gr31
-#endif
-	rett		#1
-
-# we single-stepped into an interrupt handler whilst interrupts were merely virtually disabled
-# need to really disable interrupts, set flag, fix up and return
-__break_step_kernel_external_interrupt_virtually_disabled:
-	movsg		psr,gr2
-	andi		gr2,#~PSR_PIL,gr2
-	ori		gr2,#PSR_PIL_14,gr2	/* debugging interrupts only */
-	movgs		gr2,psr
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	subcc.p		gr0,gr0,gr0,icc2	/* leave Z set, clear C */
-
-	# exceptions must've been enabled and we must've been in supervisor mode
-	setlos		BPSR_BET|BPSR_BS,gr3
-	movgs		gr3,bpsr
-
-	# return to where the interrupt happened
-	movsg		pcsr,gr2
-	movgs		gr2,bpcsr
-
-	lddi.p		@(gr31,#REG_GR(2)),gr2
-
-	xor		gr31,gr31,gr31
-	movgs		gr0,brr
-#ifdef CONFIG_MMU
-	movsg		scr3,gr31
-#endif
-	rett		#1
-
-# we stepped through into the virtual interrupt reenablement trap
-#
-# we also want to single step anyway, but after fixing up so that we get an event on the
-# instruction after the broken-into exception returns
-	.globl		__break_step_kernel_external_interrupt_virtual_reenable
-__break_step_kernel_external_interrupt_virtual_reenable:
-	movsg		psr,gr2
-	andi		gr2,#~PSR_PIL,gr2
-	movgs		gr2,psr
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	subicc		gr0,#1,gr0,icc2		/* clear Z, set C */
-
-	# save the adjusted ICC2
-	movsg		ccr,gr3
-	sti		gr3,@(gr31,#REG_CCR)
-
-	# exceptions must've been enabled and we must've been in supervisor mode
-	setlos		BPSR_BET|BPSR_BS,gr3
-	movgs		gr3,bpsr
-
-	# return to where the trap happened
-	movsg		pcsr,gr2
-	movgs		gr2,bpcsr
-
-	# and then process the single step
-	bra		__break_continue
-
-# step through an internal exception from uspace mode
-	.globl		__break_step_uspace_softprog_interrupt
-__break_step_uspace_softprog_interrupt:
-	sethi.p		%hi(__entry_uspace_softprog_interrupt_reentry),gr3
-	setlo		%lo(__entry_uspace_softprog_interrupt_reentry),gr3
-	bra		__break_return_as_uspace_prologue
-
-# step through an external interrupt from kernel mode
-	.globl		__break_step_uspace_external_interrupt
-__break_step_uspace_external_interrupt:
-	sethi.p		%hi(__entry_uspace_external_interrupt_reentry),gr3
-	setlo		%lo(__entry_uspace_external_interrupt_reentry),gr3
-
-__break_return_as_uspace_prologue:
-	LEDS		0x20ff,gr2
-
-	movgs		gr3,bpcsr
-
-	# do the bit we had to skip
-	sethi.p		%hi(__kernel_frame0_ptr),gr28
-	setlo		%lo(__kernel_frame0_ptr),gr28
-	ldi.p		@(gr28,#0),gr28
-
-	setlos		#REG__STATUS_STEP,gr2
-	sti		gr2,@(gr28,#REG__STATUS)	/* record single step status */
-
-	# cancel single-stepping mode
-	movsg		dcr,gr2
-	sethi.p		%hi(~DCR_SE),gr3
-	setlo		%lo(~DCR_SE),gr3
-	and		gr2,gr3,gr2
-	movgs		gr2,dcr
-
-	LEDS		0x20fe,gr2
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	lddi.p		@(gr31,#REG_GR(2)),gr2
-	xor		gr31,gr31,gr31
-	movgs		gr0,brr
-#ifdef CONFIG_MMU
-	movsg		scr3,gr31
-#endif
-	rett		#1
-
-#ifdef CONFIG_MMU
-# step through an ITLB-miss handler from user mode
-	.globl		__break_user_insn_tlb_miss
-__break_user_insn_tlb_miss:
-	# we'll want to try the trap stub again
-	sethi.p		%hi(__trap_user_insn_tlb_miss),gr2
-	setlo		%lo(__trap_user_insn_tlb_miss),gr2
-	movgs		gr2,bpcsr
-
-__break_tlb_miss_common:
-	LEDS		0x2101,gr2
-
-	# cancel single-stepping mode
-	movsg		dcr,gr2
-	sethi.p		%hi(~DCR_SE),gr3
-	setlo		%lo(~DCR_SE),gr3
-	and		gr2,gr3,gr2
-	movgs		gr2,dcr
-
-	# we'll swap the real return address for one with a BREAK insn so that we can re-enable
-	# single stepping on return
-	movsg		pcsr,gr2
-	sethi.p		%hi(__break_tlb_miss_real_return_info),gr3
-	setlo		%lo(__break_tlb_miss_real_return_info),gr3
-	sti		gr2,@(gr3,#0)
-
-	sethi.p		%hi(__break_tlb_miss_return_break),gr2
-	setlo		%lo(__break_tlb_miss_return_break),gr2
-	movgs		gr2,pcsr
-
-	# we also have to fudge PSR because the return BREAK is in kernel space and we want
-	# to get a BREAK fault not an access violation should the return be to userspace
-	movsg		psr,gr2
-	sti.p		gr2,@(gr3,#4)
-	ori		gr2,#PSR_PS,gr2
-	movgs		gr2,psr
-
-	LEDS		0x2102,gr2
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	lddi		@(gr31,#REG_GR(2)),gr2
-	movsg		scr3,gr31
-	movgs		gr0,brr
-	rett		#1
-
-# step through a DTLB-miss handler from user mode
-	.globl		__break_user_data_tlb_miss
-__break_user_data_tlb_miss:
-	# we'll want to try the trap stub again
-	sethi.p		%hi(__trap_user_data_tlb_miss),gr2
-	setlo		%lo(__trap_user_data_tlb_miss),gr2
-	movgs		gr2,bpcsr
-	bra		__break_tlb_miss_common
-
-# step through an ITLB-miss handler from kernel mode
-	.globl		__break_kernel_insn_tlb_miss
-__break_kernel_insn_tlb_miss:
-	# we'll want to try the trap stub again
-	sethi.p		%hi(__trap_kernel_insn_tlb_miss),gr2
-	setlo		%lo(__trap_kernel_insn_tlb_miss),gr2
-	movgs		gr2,bpcsr
-	bra		__break_tlb_miss_common
-
-# step through a DTLB-miss handler from kernel mode
-	.globl		__break_kernel_data_tlb_miss
-__break_kernel_data_tlb_miss:
-	# we'll want to try the trap stub again
-	sethi.p		%hi(__trap_kernel_data_tlb_miss),gr2
-	setlo		%lo(__trap_kernel_data_tlb_miss),gr2
-	movgs		gr2,bpcsr
-	bra		__break_tlb_miss_common
-#endif
-
-###############################################################################
-#
-# handle debug events originating with userspace
-#
-###############################################################################
-__break_maybe_userspace:
-	LEDS		0x3003,gr2
-
-	setlos		#BPSR_BS,gr2
-	andcc		gr3,gr2,gr0,icc0
-	bne		icc0,#0,__break_continue	/* skip if PSR.S was 1 */
-
-	movsg		brr,gr2
-	andicc		gr2,#BRR_ST|BRR_SB,gr0,icc0
-	beq		icc0,#0,__break_continue	/* jump if not BREAK or single-step */
-
-	LEDS		0x3007,gr2
-
-	# do the first part of the exception prologue here
-	sethi.p		%hi(__kernel_frame0_ptr),gr28
-	setlo		%lo(__kernel_frame0_ptr),gr28
-	ldi		@(gr28,#0),gr28
-	andi		gr28,#~7,gr28
-
-	# set up the kernel stack pointer
-	sti		sp  ,@(gr28,#REG_SP)
-	ori		gr28,0,sp
-	sti		gr0 ,@(gr28,#REG_GR(28))
-
-	stdi		gr20,@(gr28,#REG_GR(20))
-	stdi		gr22,@(gr28,#REG_GR(22))
-
-	movsg		tbr,gr20
-	movsg		bpcsr,gr21
-	movsg		psr,gr22
-
-	# determine the exception type and cancel single-stepping mode
-	or		gr0,gr0,gr23
-
-	movsg		dcr,gr2
-	sethi.p		%hi(DCR_SE),gr3
-	setlo		%lo(DCR_SE),gr3
-	andcc		gr2,gr3,gr0,icc0
-	beq		icc0,#0,__break_no_user_sstep	/* must have been a BREAK insn */
-
-	not		gr3,gr3
-	and		gr2,gr3,gr2
-	movgs		gr2,dcr
-	ori		gr23,#REG__STATUS_STEP,gr23
-
-__break_no_user_sstep:
-	LEDS		0x300f,gr2
-
-	movsg		brr,gr2
-	andi		gr2,#BRR_ST|BRR_SB,gr2
-	slli		gr2,#1,gr2
-	or		gr23,gr2,gr23
-	sti.p		gr23,@(gr28,#REG__STATUS)	/* record single step status */
-
-	# adjust the value acquired from TBR - this indicates the exception
-	setlos		#~TBR_TT,gr2
-	and.p		gr20,gr2,gr20
-	setlos		#TBR_TT_BREAK,gr2
-	or.p		gr20,gr2,gr20
-
-	# fudge PSR.PS and BPSR.BS to return to kernel mode through the trap
-	# table as trap 126
-	andi		gr22,#~PSR_PS,gr22		/* PSR.PS should be 0 */
-	movgs		gr22,psr
-
-	setlos		#BPSR_BS,gr2			/* BPSR.BS should be 1 and BPSR.BET 0 */
-	movgs		gr2,bpsr
-
-	# return through remainder of the exception prologue
-	# - need to load gr23 with return handler address
-	sethi.p		%hi(__entry_return_from_user_exception),gr23
-	setlo		%lo(__entry_return_from_user_exception),gr23
-	sethi.p		%hi(__entry_common),gr3
-	setlo		%lo(__entry_common),gr3
-	movgs		gr3,bpcsr
-
-	LEDS		0x301f,gr2
-
-	ldi		@(gr31,#REG_CCR),gr3
-	movgs		gr3,ccr
-	lddi.p		@(gr31,#REG_GR(2)),gr2
-	xor		gr31,gr31,gr31
-	movgs		gr0,brr
-#ifdef CONFIG_MMU
-	movsg		scr3,gr31
-#endif
-	rett		#1
-
-###############################################################################
-#
-# resume normal debug-mode entry
-#
-###############################################################################
-__break_continue:
-	LEDS		0x4003,gr2
-
-	# set up the kernel stack pointer
-	sti		sp,@(gr31,#REG_SP)
-
-	sethi.p		%hi(__break_frame_0),sp
-	setlo		%lo(__break_frame_0),sp
-
-	# finish building the exception frame
-	stdi		gr4 ,@(gr31,#REG_GR(4))
-	stdi		gr6 ,@(gr31,#REG_GR(6))
-	stdi		gr8 ,@(gr31,#REG_GR(8))
-	stdi		gr10,@(gr31,#REG_GR(10))
-	stdi		gr12,@(gr31,#REG_GR(12))
-	stdi		gr14,@(gr31,#REG_GR(14))
-	stdi		gr16,@(gr31,#REG_GR(16))
-	stdi		gr18,@(gr31,#REG_GR(18))
-	stdi		gr20,@(gr31,#REG_GR(20))
-	stdi		gr22,@(gr31,#REG_GR(22))
-	stdi		gr24,@(gr31,#REG_GR(24))
-	stdi		gr26,@(gr31,#REG_GR(26))
-	sti		gr0 ,@(gr31,#REG_GR(28))	/* NULL frame pointer */
-	sti		gr29,@(gr31,#REG_GR(29))
-	sti		gr30,@(gr31,#REG_GR(30))
-	sti		gr8 ,@(gr31,#REG_ORIG_GR8)
-
-#ifdef CONFIG_MMU
-	movsg		scr3,gr19
-	sti		gr19,@(gr31,#REG_GR(31))
-#endif
-
-	movsg		bpsr ,gr19
-	movsg		tbr  ,gr20
-	movsg		bpcsr,gr21
-	movsg		psr  ,gr22
-	movsg		isr  ,gr23
-	movsg		cccr ,gr25
-	movsg		lr   ,gr26
-	movsg		lcr  ,gr27
-
-	andi.p		gr22,#~(PSR_S|PSR_ET),gr5	/* rebuild PSR */
-	andi		gr19,#PSR_ET,gr4
-	or.p		gr4,gr5,gr5
-	srli		gr19,#10,gr4
-	andi		gr4,#PSR_S,gr4
-	or.p		gr4,gr5,gr5
-
-	setlos		#-1,gr6
-	sti		gr20,@(gr31,#REG_TBR)
-	sti		gr21,@(gr31,#REG_PC)
-	sti		gr5 ,@(gr31,#REG_PSR)
-	sti		gr23,@(gr31,#REG_ISR)
-	sti		gr25,@(gr31,#REG_CCCR)
-	stdi		gr26,@(gr31,#REG_LR)
-	sti		gr6 ,@(gr31,#REG_SYSCALLNO)
-
-	# store CPU-specific regs
-	movsg		iacc0h,gr4
-	movsg		iacc0l,gr5
-	stdi		gr4,@(gr31,#REG_IACC0)
-
-	movsg		gner0,gr4
-	movsg		gner1,gr5
-	stdi		gr4,@(gr31,#REG_GNER0)
-
-	# build the debug register frame
-	movsg		brr,gr4
-	movgs		gr0,brr
-	movsg		nmar,gr5
-	movsg		dcr,gr6
-
-	sethi.p		%hi(__debug_status),gr7
-	setlo		%lo(__debug_status),gr7
-
-	stdi		gr4 ,@(gr7,#DEBUG_BRR)
-	sti		gr19,@(gr7,#DEBUG_BPSR)
-	sti.p		gr6 ,@(gr7,#DEBUG_DCR)
-
-	# trap exceptions during break handling and disable h/w breakpoints/watchpoints
-	sethi		%hi(DCR_EBE),gr5
-	setlo.p		%lo(DCR_EBE),gr5
-	sethi		%hi(__entry_breaktrap_table),gr4
-	setlo		%lo(__entry_breaktrap_table),gr4
-	movgs		gr5,dcr
-	movgs		gr4,tbr
-
-	# set up kernel global registers
-	sethi.p		%hi(__kernel_current_task),gr5
-	setlo		%lo(__kernel_current_task),gr5
-	ld		@(gr5,gr0),gr29
-	ldi.p		@(gr29,#4),gr15		; __current_thread_info = current->thread_info
-
-	sethi		%hi(_gp),gr16
-	setlo.p		%lo(_gp),gr16
-
-	# make sure we (the kernel) get div-zero and misalignment exceptions
-	setlos		#ISR_EDE|ISR_DTT_DIVBYZERO|ISR_EMAM_EXCEPTION,gr5
-	movgs		gr5,isr
-
-	# enter the GDB stub
-	LEDS		0x4007,gr2
-