Merge commit 'perf/core' into perf/hw-breakpoint

Conflicts:
	kernel/Makefile
	kernel/trace/Makefile
	kernel/trace/trace.h
	samples/Makefile

Merge reason: We need to be uptodate with the perf events development
branch because we plan to rewrite the breakpoints API on top of
perf events.

16 files changed, 2940 insertions, 0 deletions

diff --git a/arch/score/kernel/Makefile b/arch/score/kernel/Makefile
new file mode 100644
index 00000000000..f218673b5d3
--- /dev/null
+++ b/arch/score/kernel/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for the Linux/SCORE kernel.
+#
+
+extra-y	:= head.o vmlinux.lds
+
+obj-y += entry.o init_task.o irq.o process.o ptrace.o \
+	setup.o signal.o sys_score.o time.o traps.o \
+	sys_call_table.o
+
+obj-$(CONFIG_MODULES) += module.o
diff --git a/arch/score/kernel/asm-offsets.c b/arch/score/kernel/asm-offsets.c
new file mode 100644
index 00000000000..57788f44c6f
--- /dev/null
+++ b/arch/score/kernel/asm-offsets.c
@@ -0,0 +1,216 @@
+/*
+ * arch/score/kernel/asm-offsets.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/kbuild.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+
+#include <asm-generic/cmpxchg-local.h>
+
+void output_ptreg_defines(void)
+{
+	COMMENT("SCORE pt_regs offsets.");
+	OFFSET(PT_R0, pt_regs, regs[0]);
+	OFFSET(PT_R1, pt_regs, regs[1]);
+	OFFSET(PT_R2, pt_regs, regs[2]);
+	OFFSET(PT_R3, pt_regs, regs[3]);
+	OFFSET(PT_R4, pt_regs, regs[4]);
+	OFFSET(PT_R5, pt_regs, regs[5]);
+	OFFSET(PT_R6, pt_regs, regs[6]);
+	OFFSET(PT_R7, pt_regs, regs[7]);
+	OFFSET(PT_R8, pt_regs, regs[8]);
+	OFFSET(PT_R9, pt_regs, regs[9]);
+	OFFSET(PT_R10, pt_regs, regs[10]);
+	OFFSET(PT_R11, pt_regs, regs[11]);
+	OFFSET(PT_R12, pt_regs, regs[12]);
+	OFFSET(PT_R13, pt_regs, regs[13]);
+	OFFSET(PT_R14, pt_regs, regs[14]);
+	OFFSET(PT_R15, pt_regs, regs[15]);
+	OFFSET(PT_R16, pt_regs, regs[16]);
+	OFFSET(PT_R17, pt_regs, regs[17]);
+	OFFSET(PT_R18, pt_regs, regs[18]);
+	OFFSET(PT_R19, pt_regs, regs[19]);
+	OFFSET(PT_R20, pt_regs, regs[20]);
+	OFFSET(PT_R21, pt_regs, regs[21]);
+	OFFSET(PT_R22, pt_regs, regs[22]);
+	OFFSET(PT_R23, pt_regs, regs[23]);
+	OFFSET(PT_R24, pt_regs, regs[24]);
+	OFFSET(PT_R25, pt_regs, regs[25]);
+	OFFSET(PT_R26, pt_regs, regs[26]);
+	OFFSET(PT_R27, pt_regs, regs[27]);
+	OFFSET(PT_R28, pt_regs, regs[28]);
+	OFFSET(PT_R29, pt_regs, regs[29]);
+	OFFSET(PT_R30, pt_regs, regs[30]);
+	OFFSET(PT_R31, pt_regs, regs[31]);
+
+	OFFSET(PT_ORIG_R4, pt_regs, orig_r4);
+	OFFSET(PT_ORIG_R7, pt_regs, orig_r7);
+	OFFSET(PT_CEL, pt_regs, cel);
+	OFFSET(PT_CEH, pt_regs, ceh);
+	OFFSET(PT_SR0, pt_regs, sr0);
+	OFFSET(PT_SR1, pt_regs, sr1);
+	OFFSET(PT_SR2, pt_regs, sr2);
+	OFFSET(PT_EPC, pt_regs, cp0_epc);
+	OFFSET(PT_EMA, pt_regs, cp0_ema);
+	OFFSET(PT_PSR, pt_regs, cp0_psr);
+	OFFSET(PT_ECR, pt_regs, cp0_ecr);
+	OFFSET(PT_CONDITION, pt_regs, cp0_condition);
+	OFFSET(PT_IS_SYSCALL, pt_regs, is_syscall);
+
+	DEFINE(PT_SIZE, sizeof(struct pt_regs));
+	BLANK();
+}
+
+void output_task_defines(void)
+{
+	COMMENT("SCORE task_struct offsets.");
+	OFFSET(TASK_STATE, task_struct, state);
+	OFFSET(TASK_THREAD_INFO, task_struct, stack);
+	OFFSET(TASK_FLAGS, task_struct, flags);
+	OFFSET(TASK_MM, task_struct, mm);
+	OFFSET(TASK_PID, task_struct, pid);
+	DEFINE(TASK_STRUCT_SIZE, sizeof(struct task_struct));
+	BLANK();
+}
+
+void output_thread_info_defines(void)
+{
+	COMMENT("SCORE thread_info offsets.");
+	OFFSET(TI_TASK, thread_info, task);
+	OFFSET(TI_EXEC_DOMAIN, thread_info, exec_domain);
+	OFFSET(TI_FLAGS, thread_info, flags);
+	OFFSET(TI_TP_VALUE, thread_info, tp_value);
+	OFFSET(TI_CPU, thread_info, cpu);
+	OFFSET(TI_PRE_COUNT, thread_info, preempt_count);
+	OFFSET(TI_ADDR_LIMIT, thread_info, addr_limit);
+	OFFSET(TI_RESTART_BLOCK, thread_info, restart_block);
+	OFFSET(TI_REGS, thread_info, regs);
+	DEFINE(KERNEL_STACK_SIZE, THREAD_SIZE);
+	DEFINE(KERNEL_STACK_MASK, THREAD_MASK);
+	BLANK();
+}
+
+void output_thread_defines(void)
+{
+	COMMENT("SCORE specific thread_struct offsets.");
+	OFFSET(THREAD_REG0, task_struct, thread.reg0);
+	OFFSET(THREAD_REG2, task_struct, thread.reg2);
+	OFFSET(THREAD_REG3, task_struct, thread.reg3);
+	OFFSET(THREAD_REG12, task_struct, thread.reg12);
+	OFFSET(THREAD_REG13, task_struct, thread.reg13);
+	OFFSET(THREAD_REG14, task_struct, thread.reg14);
+	OFFSET(THREAD_REG15, task_struct, thread.reg15);
+	OFFSET(THREAD_REG16, task_struct, thread.reg16);
+	OFFSET(THREAD_REG17, task_struct, thread.reg17);
+	OFFSET(THREAD_REG18, task_struct, thread.reg18);
+	OFFSET(THREAD_REG19, task_struct, thread.reg19);
+	OFFSET(THREAD_REG20, task_struct, thread.reg20);
+	OFFSET(THREAD_REG21, task_struct, thread.reg21);
+	OFFSET(THREAD_REG29, task_struct, thread.reg29);
+
+	OFFSET(THREAD_PSR, task_struct, thread.cp0_psr);
+	OFFSET(THREAD_EMA, task_struct, thread.cp0_ema);
+	OFFSET(THREAD_BADUADDR, task_struct, thread.cp0_baduaddr);
+	OFFSET(THREAD_ECODE, task_struct, thread.error_code);
+	OFFSET(THREAD_TRAPNO, task_struct, thread.trap_no);
+	BLANK();
+}
+
+void output_mm_defines(void)
+{
+	COMMENT("Size of struct page");
+	DEFINE(STRUCT_PAGE_SIZE, sizeof(struct page));
+	BLANK();
+	COMMENT("Linux mm_struct offsets.");
+	OFFSET(MM_USERS, mm_struct, mm_users);
+	OFFSET(MM_PGD, mm_struct, pgd);
+	OFFSET(MM_CONTEXT, mm_struct, context);
+	BLANK();
+	DEFINE(_PAGE_SIZE, PAGE_SIZE);
+	DEFINE(_PAGE_SHIFT, PAGE_SHIFT);
+	BLANK();
+	DEFINE(_PGD_T_SIZE, sizeof(pgd_t));
+	DEFINE(_PTE_T_SIZE, sizeof(pte_t));
+	BLANK();
+	DEFINE(_PGD_ORDER, PGD_ORDER);
+	DEFINE(_PTE_ORDER, PTE_ORDER);
+	BLANK();
+	DEFINE(_PGDIR_SHIFT, PGDIR_SHIFT);
+	BLANK();
+	DEFINE(_PTRS_PER_PGD, PTRS_PER_PGD);
+	DEFINE(_PTRS_PER_PTE, PTRS_PER_PTE);
+	BLANK();
+}
+
+void output_sc_defines(void)
+{
+	COMMENT("Linux sigcontext offsets.");
+	OFFSET(SC_REGS, sigcontext, sc_regs);
+	OFFSET(SC_MDCEH, sigcontext, sc_mdceh);
+	OFFSET(SC_MDCEL, sigcontext, sc_mdcel);
+	OFFSET(SC_PC, sigcontext, sc_pc);
+	OFFSET(SC_PSR, sigcontext, sc_psr);
+	OFFSET(SC_ECR, sigcontext, sc_ecr);
+	OFFSET(SC_EMA, sigcontext, sc_ema);
+	BLANK();
+}
+
+void output_signal_defined(void)
+{
+	COMMENT("Linux signal numbers.");
+	DEFINE(_SIGHUP, SIGHUP);
+	DEFINE(_SIGINT, SIGINT);
+	DEFINE(_SIGQUIT, SIGQUIT);
+	DEFINE(_SIGILL, SIGILL);
+	DEFINE(_SIGTRAP, SIGTRAP);
+	DEFINE(_SIGIOT, SIGIOT);
+	DEFINE(_SIGABRT, SIGABRT);
+	DEFINE(_SIGFPE, SIGFPE);
+	DEFINE(_SIGKILL, SIGKILL);
+	DEFINE(_SIGBUS, SIGBUS);
+	DEFINE(_SIGSEGV, SIGSEGV);
+	DEFINE(_SIGSYS, SIGSYS);
+	DEFINE(_SIGPIPE, SIGPIPE);
+	DEFINE(_SIGALRM, SIGALRM);
+	DEFINE(_SIGTERM, SIGTERM);
+	DEFINE(_SIGUSR1, SIGUSR1);
+	DEFINE(_SIGUSR2, SIGUSR2);
+	DEFINE(_SIGCHLD, SIGCHLD);
+	DEFINE(_SIGPWR, SIGPWR);
+	DEFINE(_SIGWINCH, SIGWINCH);
+	DEFINE(_SIGURG, SIGURG);
+	DEFINE(_SIGIO, SIGIO);
+	DEFINE(_SIGSTOP, SIGSTOP);
+	DEFINE(_SIGTSTP, SIGTSTP);
+	DEFINE(_SIGCONT, SIGCONT);
+	DEFINE(_SIGTTIN, SIGTTIN);
+	DEFINE(_SIGTTOU, SIGTTOU);
+	DEFINE(_SIGVTALRM, SIGVTALRM);
+	DEFINE(_SIGPROF, SIGPROF);
+	DEFINE(_SIGXCPU, SIGXCPU);
+	DEFINE(_SIGXFSZ, SIGXFSZ);
+	BLANK();
+}
diff --git a/arch/score/kernel/entry.S b/arch/score/kernel/entry.S
new file mode 100644
index 00000000000..577abba3fac
--- /dev/null
+++ b/arch/score/kernel/entry.S
@@ -0,0 +1,514 @@
+/*
+ * arch/score/kernel/entry.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+
+#include <asm/asmmacro.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+
+/*
+ * disable interrupts.
+ */
+.macro	disable_irq
+	mfcr	r8, cr0
+	srli	r8, r8, 1
+	slli	r8, r8, 1
+	mtcr	r8, cr0
+	nop
+	nop
+	nop
+	nop
+	nop
+.endm
+
+/*
+ * enable interrupts.
+ */
+.macro	enable_irq
+	mfcr	r8, cr0
+	ori	r8, 1
+	mtcr	r8, cr0
+	nop
+	nop
+	nop
+	nop
+	nop
+.endm
+
+__INIT
+ENTRY(debug_exception_vector)
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+
+ENTRY(general_exception_vector)			# should move to addr 0x200
+	j	general_exception
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+
+ENTRY(interrupt_exception_vector)		# should move to addr 0x210
+	j	interrupt_exception
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+	nop!
+
+	.section ".text", "ax"
+	.align	2;
+general_exception:
+	mfcr	r31, cr2
+	nop
+	la	r30, exception_handlers
+	andi	r31, 0x1f			# get ecr.exc_code
+	slli	r31, r31, 2
+	add	r30, r30, r31
+	lw	r30, [r30]
+	br	r30
+
+interrupt_exception:
+	SAVE_ALL
+	mfcr	r4, cr2
+	nop
+	lw	r16, [r28, TI_REGS]
+	sw	r0, [r28, TI_REGS]
+	la	r3, ret_from_irq
+	srli	r4, r4, 18			# get ecr.ip[7:2], interrupt No.
+	mv	r5, r0
+	j	do_IRQ
+
+ENTRY(handle_nmi)				# NMI #1
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, nmi_exception_handler
+	brl	r8
+	j	restore_all
+
+ENTRY(handle_adelinsn)				# AdEL-instruction #2
+	SAVE_ALL
+	mfcr	r8, cr6
+	nop
+	nop
+	sw	r8, [r0, PT_EMA]
+	mv	r4, r0
+	la	r8, do_adelinsn
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_ibe)				# BusEL-instruction #5
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_be
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_pel)				# P-EL #6
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_pel
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_ccu)				# CCU #8
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_ccu
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_ri)				# RI #9
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_ri
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_tr)				# Trap #10
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_tr
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_adedata)				# AdES-instruction #12
+	SAVE_ALL
+	mfcr	r8, cr6
+	nop
+	nop
+	sw	r8, [r0, PT_EMA]
+	mv	r4, r0
+	la	r8, do_adedata
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_cee)				# CeE #16
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_cee
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_cpe)				# CpE #17
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_cpe
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_dbe)				# BusEL-data #18
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_be
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+ENTRY(handle_reserved)				# others
+	SAVE_ALL
+	mv	r4, r0
+	la	r8, do_reserved
+	brl	r8
+	mv	r4, r0
+	j	ret_from_exception
+	nop
+
+#ifndef CONFIG_PREEMPT
+#define resume_kernel	restore_all
+#else
+#define __ret_from_irq	ret_from_exception
+#endif
+
+	.align	2
+#ifndef CONFIG_PREEMPT
+ENTRY(ret_from_exception)
+	disable_irq			# preempt stop
+	nop
+	j	__ret_from_irq
+	nop
+#endif
+
+ENTRY(ret_from_irq)
+	sw	r16, [r28, TI_REGS]
+
+ENTRY(__ret_from_irq)
+	lw	r8, [r0, PT_PSR]	# returning to kernel mode?
+	andri.c	r8, r8, KU_USER
+	beq	resume_kernel
+
+resume_userspace:
+	disable_irq
+	lw	r6, [r28, TI_FLAGS]	# current->work
+	li	r8, _TIF_WORK_MASK
+	and.c	r8, r8, r6		# ignoring syscall_trace
+	bne	work_pending
+	nop
+	j	restore_all
+	nop
+
+#ifdef CONFIG_PREEMPT
+resume_kernel:
+	disable_irq
+	lw	r8, [r28, TI_PRE_COUNT]
+	cmpz.c	r8
+	bne	r8, restore_all
+need_resched:
+	lw	r8, [r28, TI_FLAGS]
+	andri.c	r9, r8, _TIF_NEED_RESCHED
+	beq	restore_all
+	lw	r8, [r28, PT_PSR]		# Interrupts off?
+	andri.c	r8, r8, 1
+	beq	restore_all
+	bl	preempt_schedule_irq
+	nop
+	j	need_resched
+	nop
+#endif
+
+ENTRY(ret_from_fork)
+	bl	schedule_tail			# r4=struct task_struct *prev
+
+ENTRY(syscall_exit)
+	nop
+	disable_irq
+	lw	r6, [r28, TI_FLAGS]		# current->work
+	li	r8, _TIF_WORK_MASK
+	and.c	r8, r6, r8
+	bne	syscall_exit_work
+
+ENTRY(restore_all)					# restore full frame
+	RESTORE_ALL_AND_RET
+
+work_pending:
+	andri.c	r8, r6, _TIF_NEED_RESCHED # r6 is preloaded with TI_FLAGS
+	beq	work_notifysig
+work_resched:
+	bl	schedule
+	nop
+	disable_irq
+	lw	r6, [r28, TI_FLAGS]
+	li	r8, _TIF_WORK_MASK
+	and.c	r8, r6, r8	# is there any work to be done
+				# other than syscall tracing?
+	beq	restore_all
+	andri.c	r8, r6, _TIF_NEED_RESCHED
+	bne	work_resched
+
+work_notifysig:
+	mv	r4, r0
+	li	r5, 0
+	bl	do_notify_resume	# r6 already loaded
+	nop
+	j	resume_userspace
+	nop
+
+ENTRY(syscall_exit_work)
+	li	r8, _TIF_SYSCALL_TRACE
+	and.c	r8, r8, r6		# r6 is preloaded with TI_FLAGS
+	beq	work_pending		# trace bit set?
+	nop
+	enable_irq
+	mv	r4, r0
+	li	r5, 1
+	bl	do_syscall_trace
+	nop
+	b	resume_userspace
+	nop
+
+.macro	save_context	reg
+	sw	r12, [\reg, THREAD_REG12];
+	sw	r13, [\reg, THREAD_REG13];
+	sw	r14, [\reg, THREAD_REG14];
+	sw	r15, [\reg, THREAD_REG15];
+	sw	r16, [\reg, THREAD_REG16];
+	sw	r17, [\reg, THREAD_REG17];
+	sw	r18, [\reg, THREAD_REG18];
+	sw	r19, [\reg, THREAD_REG19];
+	sw	r20, [\reg, THREAD_REG20];
+	sw	r21, [\reg, THREAD_REG21];
+	sw	r29, [\reg, THREAD_REG29];
+	sw	r2, [\reg, THREAD_REG2];
+	sw	r0, [\reg, THREAD_REG0]
+.endm
+
+.macro	restore_context	reg
+	lw	r12, [\reg, THREAD_REG12];
+	lw	r13, [\reg, THREAD_REG13];
+	lw	r14, [\reg, THREAD_REG14];
+	lw	r15, [\reg, THREAD_REG15];
+	lw	r16, [\reg, THREAD_REG16];
+	lw	r17, [\reg, THREAD_REG17];
+	lw	r18, [\reg, THREAD_REG18];
+	lw	r19, [\reg, THREAD_REG19];
+	lw	r20, [\reg, THREAD_REG20];
+	lw	r21, [\reg, THREAD_REG21];
+	lw	r29, [\reg, THREAD_REG29];
+	lw	r0, [\reg, THREAD_REG0];
+	lw	r2, [\reg, THREAD_REG2];
+	lw	r3, [\reg, THREAD_REG3]
+.endm
+
+/*
+ * task_struct *resume(task_struct *prev, task_struct *next,
+ *			struct thread_info *next_ti)
+ */
+ENTRY(resume)
+	mfcr	r9, cr0
+	nop
+	nop
+	sw	r9, [r4, THREAD_PSR]
+	save_context	r4
+	sw	r3, [r4, THREAD_REG3]
+
+	mv	r28, r6
+	restore_context	r5
+	mv	r8, r6
+	addi	r8, KERNEL_STACK_SIZE
+	subi	r8, 32
+	la 	r9, kernelsp;
+	sw 	r8, [r9];
+
+	mfcr	r9, cr0
+	ldis	r7, 0x00ff
+	nop
+	and	r9, r9, r7
+	lw	r6, [r5, THREAD_PSR]
+	not	r7, r7
+	and	r6, r6, r7
+	or	r6, r6, r9
+	mtcr	r6, cr0
+	nop; nop; nop; nop; nop
+	br	r3
+
+ENTRY(handle_sys)
+	SAVE_ALL
+	sw	r8, [r0, 16]		# argument 5 from user r8
+	sw	r9, [r0, 20]		# argument 6 from user r9
+	enable_irq
+
+	sw	r4, [r0, PT_ORIG_R4]	#for restart syscall
+	sw	r7, [r0, PT_ORIG_R7]	#for restart syscall
+	sw	r27, [r0, PT_IS_SYSCALL] # it from syscall
+
+	lw	r9, [r0, PT_EPC]	# skip syscall on return
+	addi	r9, 4
+	sw	r9, [r0, PT_EPC]
+
+	cmpi.c	r27, __NR_syscalls 	# check syscall number
+	bgtu	illegal_syscall
+
+	slli	r8, r27, 2		# get syscall routine
+	la	r11, sys_call_table
+	add	r11, r11, r8
+	lw	r10, [r11]		# get syscall entry
+
+	cmpz.c	r10
+	beq	illegal_syscall
+
+	lw	r8, [r28, TI_FLAGS]
+	li	r9, _TIF_SYSCALL_TRACE
+	and.c	r8, r8, r9
+	bne	syscall_trace_entry
+
+	brl	r10			# Do The Real system call
+
+	cmpi.c	r4, 0
+	blt	1f
+	ldi	r8, 0
+	sw	r8, [r0, PT_R7]
+	b 2f
+1:
+	cmpi.c	r4, -MAX_ERRNO - 1
+	ble	2f
+	ldi	r8, 0x1;
+	sw	r8, [r0, PT_R7]
+	neg	r4, r4
+2:
+	sw	r4, [r0, PT_R4]		# save result
+
+syscall_return:
+	disable_irq
+	lw	r6, [r28, TI_FLAGS]	# current->work
+	li	r8, _TIF_WORK_MASK
+	and.c	r8, r6, r8
+	bne	syscall_return_work
+	j	restore_all
+
+syscall_return_work:
+	j	syscall_exit_work
+
+syscall_trace_entry:
+	mv	r16, r10
+	mv	r4, r0
+	li	r5, 0
+	bl	do_syscall_trace
+
+	mv	r8, r16
+	lw	r4, [r0, PT_R4]		# Restore argument registers
+	lw	r5, [r0, PT_R5]
+	lw	r6, [r0, PT_R6]
+	lw	r7, [r0, PT_R7]
+	brl	r8
+
+	li	r8, -MAX_ERRNO - 1
+	sw	r8, [r0, PT_R7]		# set error flag
+
+	neg	r4, r4			# error
+	sw	r4, [r0, PT_R0]		# set flag for syscall
+					# restarting
+1:	sw	r4, [r0, PT_R2]		# result
+	j	syscall_exit
+
+illegal_syscall:
+	ldi	r4, -ENOSYS		# error
+	sw	r4, [r0, PT_ORIG_R4]
+	sw	r4, [r0, PT_R4]
+	ldi	r9, 1			# set error flag
+	sw	r9, [r0, PT_R7]
+	j	syscall_return
+
+ENTRY(sys_execve)
+	mv	r4, r0
+	la	r8, score_execve
+	br	r8
+
+ENTRY(sys_clone)
+	mv	r4, r0
+	la	r8, score_clone
+	br	r8
+
+ENTRY(sys_rt_sigreturn)
+	mv	r4, r0
+	la	r8, score_rt_sigreturn
+	br	r8
+
+ENTRY(sys_sigaltstack)
+	mv	r4, r0
+	la	r8, score_sigaltstack
+	br	r8
+
+#ifdef __ARCH_WANT_SYSCALL_DEPRECATED
+ENTRY(sys_fork)
+	mv	r4, r0
+	la	r8, score_fork
+	br	r8
+
+ENTRY(sys_vfork)
+	mv	r4, r0
+	la	r8, score_vfork
+	br	r8
+#endif /* __ARCH_WANT_SYSCALL_DEPRECATED */
+
diff --git a/arch/score/kernel/head.S b/arch/score/kernel/head.S
new file mode 100644
index 00000000000..22a7e3c7292
--- /dev/null
+++ b/arch/score/kernel/head.S
@@ -0,0 +1,70 @@
+/*
+ * arch/score/kernel/head.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/init.h>
+#include <linux/linkage.h>
+
+#include <asm/asm-offsets.h>
+
+	.extern start_kernel
+	.global init_thread_union
+	.global	kernelsp
+
+__INIT
+ENTRY(_stext)
+	la	r30, __bss_start	/* initialize BSS segment. */
+	la	r31, _end
+	xor	r8, r8, r8
+
+1:	cmp.c	r31, r30
+	beq	2f
+
+	sw	r8, [r30]		/* clean memory. */
+	addi	r30, 4
+	b	1b
+
+2:	la	r28, init_thread_union	/* set kernel stack. */
+	mv	r0, r28
+	addi	r0, KERNEL_STACK_SIZE - 32
+	la	r30, kernelsp
+	sw	r0, [r30]
+	subi	r0, 4*4
+	xor	r30, r30, r30
+	ori	r30, 0x02		/* enable MMU. */
+	mtcr	r30, cr4
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	/* there is no parameter */
+	xor	r4, r4, r4
+	xor	r5, r5, r5
+	xor	r6, r6, r6
+	xor	r7, r7, r7
+	la	r30, start_kernel	/* jump to init_arch */
+	br	r30
diff --git a/arch/score/kernel/init_task.c b/arch/score/kernel/init_task.c
new file mode 100644
index 00000000000..baa03ee217d
--- /dev/null
+++ b/arch/score/kernel/init_task.c
@@ -0,0 +1,46 @@
+/*
+ * arch/score/kernel/init_task.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/init_task.h>
+#include <linux/mqueue.h>
+
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+
+/*
+ * Initial thread structure.
+ *
+ * We need to make sure that this is THREAD_SIZE aligned due to the
+ * way process stacks are handled. This is done by having a special
+ * "init_task" linker map entry..
+ */
+union thread_union init_thread_union __init_task_data =
+	{ INIT_THREAD_INFO(init_task) };
+
+/*
+ * Initial task structure.
+ *
+ * All other task structs will be allocated on slabs in fork.c
+ */
+struct task_struct init_task = INIT_TASK(init_task);
+EXPORT_SYMBOL(init_task);
diff --git a/arch/score/kernel/irq.c b/arch/score/kernel/irq.c
new file mode 100644
index 00000000000..47647dde09c
--- /dev/null
+++ b/arch/score/kernel/irq.c
@@ -0,0 +1,148 @@
+/*
+ * arch/score/kernel/irq.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/seq_file.h>
+
+#include <asm/io.h>
+
+/* the interrupt controller is hardcoded at this address */
+#define SCORE_PIC		((u32 __iomem __force *)0x95F50000)
+
+#define INT_PNDL		0
+#define INT_PNDH		1
+#define INT_PRIORITY_M		2
+#define INT_PRIORITY_SG0	4
+#define INT_PRIORITY_SG1	5
+#define INT_PRIORITY_SG2	6
+#define INT_PRIORITY_SG3	7
+#define INT_MASKL		8
+#define INT_MASKH		9
+
+/*
+ * handles all normal device IRQs
+ */
+asmlinkage void do_IRQ(int irq)
+{
+	irq_enter();
+	generic_handle_irq(irq);
+	irq_exit();
+}
+
+static void score_mask(unsigned int irq_nr)
+{
+	unsigned int irq_source = 63 - irq_nr;
+
+	if (irq_source < 32)
+		__raw_writel((__raw_readl(SCORE_PIC + INT_MASKL) | \
+			(1 << irq_source)), SCORE_PIC + INT_MASKL);
+	else
+		__raw_writel((__raw_readl(SCORE_PIC + INT_MASKH) | \
+			(1 << (irq_source - 32))), SCORE_PIC + INT_MASKH);
+}
+
+static void score_unmask(unsigned int irq_nr)
+{
+	unsigned int irq_source = 63 - irq_nr;
+
+	if (irq_source < 32)
+		__raw_writel((__raw_readl(SCORE_PIC + INT_MASKL) & \
+			~(1 << irq_source)), SCORE_PIC + INT_MASKL);
+	else
+		__raw_writel((__raw_readl(SCORE_PIC + INT_MASKH) & \
+			~(1 << (irq_source - 32))), SCORE_PIC + INT_MASKH);
+}
+
+struct irq_chip score_irq_chip = {
+	.name		= "Score7-level",
+	.mask		= score_mask,
+	.mask_ack	= score_mask,
+	.unmask		= score_unmask,
+};
+
+/*
+ * initialise the interrupt system
+ */
+void __init init_IRQ(void)
+{
+	int index;
+	unsigned long target_addr;
+
+	for (index = 0; index < NR_IRQS; ++index)
+		set_irq_chip_and_handler(index, &score_irq_chip,
+					 handle_level_irq);
+
+	for (target_addr = IRQ_VECTOR_BASE_ADDR;
+		target_addr <= IRQ_VECTOR_END_ADDR;
+		target_addr += IRQ_VECTOR_SIZE)
+		memcpy((void *)target_addr, \
+			interrupt_exception_vector, IRQ_VECTOR_SIZE);
+
+	__raw_writel(0xffffffff, SCORE_PIC + INT_MASKL);
+	__raw_writel(0xffffffff, SCORE_PIC + INT_MASKH);
+
+	__asm__ __volatile__(
+		"mtcr	%0, cr3\n\t"
+		: : "r" (EXCEPTION_VECTOR_BASE_ADDR | \
+			VECTOR_ADDRESS_OFFSET_MODE16));
+}
+
+/*
+ * Generic, controller-independent functions:
+ */
+int show_interrupts(struct seq_file *p, void *v)
+{
+	int i = *(loff_t *)v, cpu;
+	struct irqaction *action;
+	unsigned long flags;
+
+	if (i == 0) {
+		seq_puts(p, "           ");
+		for_each_online_cpu(cpu)
+			seq_printf(p, "CPU%d       ", cpu);
+		seq_putc(p, '\n');
+	}
+
+	if (i < NR_IRQS) {
+		spin_lock_irqsave(&irq_desc[i].lock, flags);
+		action = irq_desc[i].action;
+		if (!action)
+			goto unlock;
+
+		seq_printf(p, "%3d: ", i);
+		seq_printf(p, "%10u ", kstat_irqs(i));
+		seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
+		seq_printf(p, "  %s", action->name);
+		for (action = action->next; action; action = action->next)
+			seq_printf(p, ", %s", action->name);
+
+		seq_putc(p, '\n');
+unlock:
+		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+	}
+
+	return 0;
+}
diff --git a/arch/score/kernel/module.c b/arch/score/kernel/module.c
new file mode 100644
index 00000000000..4de8d47becd
--- /dev/null
+++ b/arch/score/kernel/module.c
@@ -0,0 +1,165 @@
+/*
+ * arch/score/kernel/module.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/moduleloader.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+
+void *module_alloc(unsigned long size)
+{
+	return size ? vmalloc(size) : NULL;
+}
+
+/* Free memory returned from module_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+	vfree(module_region);
+}
+
+int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
+			char *secstrings, struct module *mod)
+{
+	return 0;
+}
+
+int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
+		unsigned int symindex, unsigned int relindex,
+		struct module *me)
+{
+	Elf32_Shdr *symsec = sechdrs + symindex;
+	Elf32_Shdr *relsec = sechdrs + relindex;
+	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
+	Elf32_Rel *rel = (void *)relsec->sh_addr;
+	unsigned int i;
+
+	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
+		uns