score: Add support for Sunplus S+core architecture

This is the complete set of new arch Score's files for linux.
Score instruction set support 16bits, 32bits and 64bits instruction,
Score SOC had been used in game machine and LCD TV.

Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 349 insertions, 0 deletions

diff --git a/arch/score/kernel/traps.c b/arch/score/kernel/traps.c
new file mode 100644
index 0000000..957ae9e
--- /dev/null
+++ b/arch/score/kernel/traps.c
@@ -0,0 +1,349 @@
+/*
+ * arch/score/kernel/traps.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/module.h>
+#include <linux/sched.h>
+
+#include <asm/cacheflush.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+
+unsigned long exception_handlers[32];
+
+/*
+ * The architecture-independent show_stack generator
+ */
+void show_stack(struct task_struct *task, unsigned long *sp)
+{
+	int i;
+	long stackdata;
+
+	sp = sp ? sp : (unsigned long *)&sp;
+
+	printk(KERN_NOTICE "Stack: ");
+	i = 1;
+	while ((long) sp & (PAGE_SIZE - 1)) {
+		if (i && ((i % 8) == 0))
+			printk(KERN_NOTICE "\n");
+		if (i > 40) {
+			printk(KERN_NOTICE " ...");
+			break;
+		}
+
+		if (__get_user(stackdata, sp++)) {
+			printk(KERN_NOTICE " (Bad stack address)");
+			break;
+		}
+
+		printk(KERN_NOTICE " %08lx", stackdata);
+		i++;
+	}
+	printk(KERN_NOTICE "\n");
+}
+
+static void show_trace(long *sp)
+{
+	int i;
+	long addr;
+
+	sp = sp ? sp : (long *) &sp;
+
+	printk(KERN_NOTICE "Call Trace:  ");
+	i = 1;
+	while ((long) sp & (PAGE_SIZE - 1)) {
+		if (__get_user(addr, sp++)) {
+			if (i && ((i % 6) == 0))
+				printk(KERN_NOTICE "\n");
+			printk(KERN_NOTICE " (Bad stack address)\n");
+			break;
+		}
+
+		if (kernel_text_address(addr)) {
+			if (i && ((i % 6) == 0))
+				printk(KERN_NOTICE "\n");
+			if (i > 40) {
+				printk(KERN_NOTICE " ...");
+				break;
+			}
+
+			printk(KERN_NOTICE " [<%08lx>]", addr);
+			i++;
+		}
+	}
+	printk(KERN_NOTICE "\n");
+}
+
+static void show_code(unsigned int *pc)
+{
+	long i;
+
+	printk(KERN_NOTICE "\nCode:");
+
+	for (i = -3; i < 6; i++) {
+		unsigned long insn;
+		if (__get_user(insn, pc + i)) {
+			printk(KERN_NOTICE " (Bad address in epc)\n");
+			break;
+		}
+		printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
+			insn, (i ? ' ' : '>'));
+	}
+}
+
+/*
+ * FIXME: really the generic show_regs should take a const pointer argument.
+ */
+void show_regs(struct pt_regs *regs)
+{
+	printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
+		regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
+		regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
+	printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
+		regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
+		regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
+	printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
+		regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
+		regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
+	printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
+		regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
+		regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
+
+	printk("CEH : %08lx\n", regs->ceh);
+	printk("CEL : %08lx\n", regs->cel);
+
+	printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
+		regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
+		regs->cp0_ecr, regs->cp0_condition);
+}
+
+static void show_registers(struct pt_regs *regs)
+{
+	show_regs(regs);
+	printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
+		current->comm, current->pid, (unsigned long) current);
+	show_stack(current_thread_info()->task, (long *) regs->regs[0]);
+	show_trace((long *) regs->regs[0]);
+	show_code((unsigned int *) regs->cp0_epc);
+	printk(KERN_NOTICE "\n");
+}
+
+/*
+ * The architecture-independent dump_stack generator
+ */
+void dump_stack(void)
+{
+	show_stack(current_thread_info()->task,
+		   (long *) get_irq_regs()->regs[0]);
+}
+EXPORT_SYMBOL(dump_stack);
+
+void __die(const char *str, struct pt_regs *regs, const char *file,
+	const char *func, unsigned long line)
+{
+	console_verbose();
+	printk("%s", str);
+	if (file && func)
+		printk(" in %s:%s, line %ld", file, func, line);
+	printk(":\n");
+	show_registers(regs);
+	do_exit(SIGSEGV);
+}
+
+void __die_if_kernel(const char *str, struct pt_regs *regs,
+		const char *file, const char *func, unsigned long line)
+{
+	if (!user_mode(regs))
+		__die(str, regs, file, func, line);
+}
+
+asmlinkage void do_adelinsn(struct pt_regs *regs)
+{
+	printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
+		 regs->cp0_ema, regs->cp0_epc);
+	die_if_kernel("do_ade execution Exception\n", regs);
+	force_sig(SIGBUS, current);
+}
+
+asmlinkage void do_adedata(struct pt_regs *regs)
+{
+	const struct exception_table_entry *fixup;
+	fixup = search_exception_tables(regs->cp0_epc);
+	if (fixup) {
+		regs->cp0_epc = fixup->fixup;
+		return;
+	}
+	printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
+		 regs->cp0_ema, regs->cp0_epc);
+	die_if_kernel("do_ade execution Exception\n", regs);
+	force_sig(SIGBUS, current);
+}
+
+asmlinkage void do_pel(struct pt_regs *regs)
+{
+	die_if_kernel("do_pel execution Exception", regs);
+	force_sig(SIGFPE, current);
+}
+
+asmlinkage void do_cee(struct pt_regs *regs)
+{
+	die_if_kernel("do_cee execution Exception", regs);
+	force_sig(SIGFPE, current);
+}
+
+asmlinkage void do_cpe(struct pt_regs *regs)
+{
+	die_if_kernel("do_cpe execution Exception", regs);
+	force_sig(SIGFPE, current);
+}
+
+asmlinkage void do_be(struct pt_regs *regs)
+{
+	die_if_kernel("do_be execution Exception", regs);
+	force_sig(SIGBUS, current);
+}
+
+asmlinkage void do_ov(struct pt_regs *regs)
+{
+	siginfo_t info;
+
+	die_if_kernel("do_ov execution Exception", regs);
+
+	info.si_code = FPE_INTOVF;
+	info.si_signo = SIGFPE;
+	info.si_errno = 0;
+	info.si_addr = (void *)regs->cp0_epc;
+	force_sig_info(SIGFPE, &info, current);
+}
+
+asmlinkage void do_tr(struct pt_regs *regs)
+{
+	die_if_kernel("do_tr execution Exception", regs);
+	force_sig(SIGTRAP, current);
+}
+
+asmlinkage void do_ri(struct pt_regs *regs)
+{
+	unsigned long epc_insn;
+	unsigned long epc = regs->cp0_epc;
+
+	read_tsk_long(current, epc, &epc_insn);
+	if (current->thread.single_step == 1) {
+		if ((epc == current->thread.addr1) ||
+		    (epc == current->thread.addr2)) {
+			clear_single_step(current);
+			force_sig(SIGTRAP, current);
+			return;
+		} else
+			BUG();
+	} else if ((epc_insn == BREAKPOINT32_INSN) ||
+		   ((epc_insn & 0x0000FFFF) == 0x7002) ||
+		   ((epc_insn & 0xFFFF0000) == 0x70020000)) {
+			force_sig(SIGTRAP, current);
+			return;
+	} else {
+		die_if_kernel("do_ri execution Exception", regs);
+		force_sig(SIGILL, current);
+	}
+}
+
+asmlinkage void do_ccu(struct pt_regs *regs)
+{
+	die_if_kernel("do_ccu execution Exception", regs);
+	force_sig(SIGILL, current);
+}
+
+asmlinkage void do_reserved(struct pt_regs *regs)
+{
+	/*
+	 * Game over - no way to handle this if it ever occurs.  Most probably
+	 * caused by a new unknown cpu type or after another deadly
+	 * hard/software error.
+	 */
+	die_if_kernel("do_reserved execution Exception", regs);
+	show_regs(regs);
+	panic("Caught reserved exception - should not happen.");
+}
+
+/*
+ * NMI exception handler.
+ */
+void nmi_exception_handler(struct pt_regs *regs)
+{
+	die_if_kernel("nmi_exception_handler execution Exception", regs);
+	die("NMI", regs);
+}
+
+/* Install CPU exception handler */
+void *set_except_vector(int n, void *addr)
+{
+	unsigned long handler = (unsigned long) addr;
+	unsigned long old_handler = exception_handlers[n];
+
+	exception_handlers[n] = handler;
+	return (void *)old_handler;
+}
+
+void __init trap_init(void)
+{
+	int i;
+
+	pgd_current = (unsigned long)init_mm.pgd;
+	/* DEBUG EXCEPTION */
+	memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
+			&debug_exception_vector, DEBUG_VECTOR_SIZE);
+	/* NMI EXCEPTION */
+	memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
+			&general_exception_vector, GENERAL_VECTOR_SIZE);
+
+	/*
+	 * Initialise exception handlers
+	 */
+	for (i = 0; i <= 31; i++)
+		set_except_vector(i, handle_reserved);
+
+	set_except_vector(1, handle_nmi);
+	set_except_vector(2, handle_adelinsn);
+	set_except_vector(3, handle_tlb_refill);
+	set_except_vector(4, handle_tlb_invaild);
+	set_except_vector(5, handle_ibe);
+	set_except_vector(6, handle_pel);
+	set_except_vector(7, handle_sys);
+	set_except_vector(8, handle_ccu);
+	set_except_vector(9, handle_ri);
+	set_except_vector(10, handle_tr);
+	set_except_vector(11, handle_adedata);
+	set_except_vector(12, handle_adedata);
+	set_except_vector(13, handle_tlb_refill);
+	set_except_vector(14, handle_tlb_invaild);
+	set_except_vector(15, handle_mod);
+	set_except_vector(16, handle_cee);
+	set_except_vector(17, handle_cpe);
+	set_except_vector(18, handle_dbe);
+	flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);
+
+	atomic_inc(&init_mm.mm_count);
+	current->active_mm = &init_mm;
+	cpu_cache_init();
+}