Fixed MTP to work with TWRP

arch/openrisc/kernel/Makefile

@@ -0,0 +1,14 @@
+#
+# Makefile for the linux kernel.
+#
+
+extra-y	:= head.o vmlinux.lds
+
+obj-y	:= setup.o or32_ksyms.o process.o dma.o \
+	   traps.o time.o irq.o entry.o ptrace.o signal.o \
+	   sys_call_table.o
+
+obj-$(CONFIG_MODULES)		+= module.o
+obj-$(CONFIG_OF)		+= prom.o
+
+clean:

arch/openrisc/kernel/asm-offsets.c

@@ -0,0 +1,66 @@
+/*
+ * OpenRISC asm-offsets.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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 used to generate definitions needed by
+ * assembly language modules.
+ *
+ * We use the technique used in the OSF Mach kernel code:
+ * generate asm statements containing #defines,
+ * compile this file to assembler, and then extract the
+ * #defines from the assembly-language output.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/thread_info.h>
+#include <linux/kbuild.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+
+int main(void)
+{
+	/* offsets into the task_struct */
+	DEFINE(TASK_STATE, offsetof(struct task_struct, state));
+	DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
+	DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
+	DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
+	DEFINE(TASK_MM, offsetof(struct task_struct, mm));
+	DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
+
+	/* offsets into thread_info */
+	DEFINE(TI_TASK, offsetof(struct thread_info, task));
+	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
+	DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
+	DEFINE(TI_KSP, offsetof(struct thread_info, ksp));
+
+	DEFINE(PT_SIZE, sizeof(struct pt_regs));
+
+	/* Interrupt register frame */
+	DEFINE(STACK_FRAME_OVERHEAD, STACK_FRAME_OVERHEAD);
+	DEFINE(INT_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs));
+
+	DEFINE(NUM_USER_SEGMENTS, TASK_SIZE >> 28);
+	return 0;
+}

arch/openrisc/kernel/dma.c

@@ -0,0 +1,254 @@
+/*
+ * OpenRISC Linux
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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.
+ *
+ * DMA mapping callbacks...
+ * As alloc_coherent is the only DMA callback being used currently, that's
+ * the only thing implemented properly.  The rest need looking into...
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/dma-debug.h>
+#include <linux/export.h>
+#include <linux/dma-attrs.h>
+
+#include <asm/cpuinfo.h>
+#include <asm/spr_defs.h>
+#include <asm/tlbflush.h>
+
+static int
+page_set_nocache(pte_t *pte, unsigned long addr,
+		 unsigned long next, struct mm_walk *walk)
+{
+	unsigned long cl;
+
+	pte_val(*pte) |= _PAGE_CI;
+
+	/*
+	 * Flush the page out of the TLB so that the new page flags get
+	 * picked up next time there's an access
+	 */
+	flush_tlb_page(NULL, addr);
+
+	/* Flush page out of dcache */
+	for (cl = __pa(addr); cl < __pa(next); cl += cpuinfo.dcache_block_size)
+		mtspr(SPR_DCBFR, cl);
+
+	return 0;
+}
+
+static int
+page_clear_nocache(pte_t *pte, unsigned long addr,
+		   unsigned long next, struct mm_walk *walk)
+{
+	pte_val(*pte) &= ~_PAGE_CI;
+
+	/*
+	 * Flush the page out of the TLB so that the new page flags get
+	 * picked up next time there's an access
+	 */
+	flush_tlb_page(NULL, addr);
+
+	return 0;
+}
+
+/*
+ * Alloc "coherent" memory, which for OpenRISC means simply uncached.
+ *
+ * This function effectively just calls __get_free_pages, sets the
+ * cache-inhibit bit on those pages, and makes sure that the pages are
+ * flushed out of the cache before they are used.
+ *
+ * If the NON_CONSISTENT attribute is set, then this function just
+ * returns "normal", cachable memory.
+ *
+ * There are additional flags WEAK_ORDERING and WRITE_COMBINE to take
+ * into consideration here, too.  All current known implementations of
+ * the OR1K support only strongly ordered memory accesses, so that flag
+ * is being ignored for now; uncached but write-combined memory is a
+ * missing feature of the OR1K.
+ */
+static void *
+or1k_dma_alloc(struct device *dev, size_t size,
+	       dma_addr_t *dma_handle, gfp_t gfp,
+	       struct dma_attrs *attrs)
+{
+	unsigned long va;
+	void *page;
+	struct mm_walk walk = {
+		.pte_entry = page_set_nocache,
+		.mm = &init_mm
+	};
+
+	page = alloc_pages_exact(size, gfp);
+	if (!page)
+		return NULL;
+
+	/* This gives us the real physical address of the first page. */
+	*dma_handle = __pa(page);
+
+	va = (unsigned long)page;
+
+	if (!dma_get_attr(DMA_ATTR_NON_CONSISTENT, attrs)) {
+		/*
+		 * We need to iterate through the pages, clearing the dcache for
+		 * them and setting the cache-inhibit bit.
+		 */
+		if (walk_page_range(va, va + size, &walk)) {
+			free_pages_exact(page, size);
+			return NULL;
+		}
+	}
+
+	return (void *)va;
+}
+
+static void
+or1k_dma_free(struct device *dev, size_t size, void *vaddr,
+	      dma_addr_t dma_handle, struct dma_attrs *attrs)
+{
+	unsigned long va = (unsigned long)vaddr;
+	struct mm_walk walk = {
+		.pte_entry = page_clear_nocache,
+		.mm = &init_mm
+	};
+
+	if (!dma_get_attr(DMA_ATTR_NON_CONSISTENT, attrs)) {
+		/* walk_page_range shouldn't be able to fail here */
+		WARN_ON(walk_page_range(va, va + size, &walk));
+	}
+
+	free_pages_exact(vaddr, size);
+}
+
+static dma_addr_t
+or1k_map_page(struct device *dev, struct page *page,
+	      unsigned long offset, size_t size,
+	      enum dma_data_direction dir,
+	      struct dma_attrs *attrs)
+{
+	unsigned long cl;
+	dma_addr_t addr = page_to_phys(page) + offset;
+
+	switch (dir) {
+	case DMA_TO_DEVICE:
+		/* Flush the dcache for the requested range */
+		for (cl = addr; cl < addr + size;
+		     cl += cpuinfo.dcache_block_size)
+			mtspr(SPR_DCBFR, cl);
+		break;
+	case DMA_FROM_DEVICE:
+		/* Invalidate the dcache for the requested range */
+		for (cl = addr; cl < addr + size;
+		     cl += cpuinfo.dcache_block_size)
+			mtspr(SPR_DCBIR, cl);
+		break;
+	default:
+		/*
+		 * NOTE: If dir == DMA_BIDIRECTIONAL then there's no need to
+		 * flush nor invalidate the cache here as the area will need
+		 * to be manually synced anyway.
+		 */
+		break;
+	}
+
+	return addr;
+}
+
+static void
+or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
+		size_t size, enum dma_data_direction dir,
+		struct dma_attrs *attrs)
+{
+	/* Nothing special to do here... */
+}
+
+static int
+or1k_map_sg(struct device *dev, struct scatterlist *sg,
+	    int nents, enum dma_data_direction dir,
+	    struct dma_attrs *attrs)
+{
+	struct scatterlist *s;
+	int i;
+
+	for_each_sg(sg, s, nents, i) {
+		s->dma_address = or1k_map_page(dev, sg_page(s), s->offset,
+					       s->length, dir, NULL);
+	}
+
+	return nents;
+}
+
+static void
+or1k_unmap_sg(struct device *dev, struct scatterlist *sg,
+	      int nents, enum dma_data_direction dir,
+	      struct dma_attrs *attrs)
+{
+	struct scatterlist *s;
+	int i;
+
+	for_each_sg(sg, s, nents, i) {
+		or1k_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, NULL);
+	}
+}
+
+static void
+or1k_sync_single_for_cpu(struct device *dev,
+			 dma_addr_t dma_handle, size_t size,
+			 enum dma_data_direction dir)
+{
+	unsigned long cl;
+	dma_addr_t addr = dma_handle;
+
+	/* Invalidate the dcache for the requested range */
+	for (cl = addr; cl < addr + size; cl += cpuinfo.dcache_block_size)
+		mtspr(SPR_DCBIR, cl);
+}
+
+static void
+or1k_sync_single_for_device(struct device *dev,
+			    dma_addr_t dma_handle, size_t size,
+			    enum dma_data_direction dir)
+{
+	unsigned long cl;
+	dma_addr_t addr = dma_handle;
+
+	/* Flush the dcache for the requested range */
+	for (cl = addr; cl < addr + size; cl += cpuinfo.dcache_block_size)
+		mtspr(SPR_DCBFR, cl);
+}
+
+struct dma_map_ops or1k_dma_map_ops = {
+	.alloc = or1k_dma_alloc,
+	.free = or1k_dma_free,
+	.map_page = or1k_map_page,
+	.unmap_page = or1k_unmap_page,
+	.map_sg = or1k_map_sg,
+	.unmap_sg = or1k_unmap_sg,
+	.sync_single_for_cpu = or1k_sync_single_for_cpu,
+	.sync_single_for_device = or1k_sync_single_for_device,
+};
+EXPORT_SYMBOL(or1k_dma_map_ops);
+
+/* Number of entries preallocated for DMA-API debugging */
+#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
+
+static int __init dma_init(void)
+{
+	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+
+	return 0;
+}
+fs_initcall(dma_init);

arch/openrisc/kernel/irq.c

@@ -0,0 +1,54 @@
+/*
+ * OpenRISC irq.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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/interrupt.h>
+#include <linux/init.h>
+#include <linux/ftrace.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/export.h>
+#include <linux/irqflags.h>
+
+/* read interrupt enabled status */
+unsigned long arch_local_save_flags(void)
+{
+	return mfspr(SPR_SR) & (SPR_SR_IEE|SPR_SR_TEE);
+}
+EXPORT_SYMBOL(arch_local_save_flags);
+
+/* set interrupt enabled status */
+void arch_local_irq_restore(unsigned long flags)
+{
+	mtspr(SPR_SR, ((mfspr(SPR_SR) & ~(SPR_SR_IEE|SPR_SR_TEE)) | flags));
+}
+EXPORT_SYMBOL(arch_local_irq_restore);
+
+void __init init_IRQ(void)
+{
+	irqchip_init();
+}
+
+static void (*handle_arch_irq)(struct pt_regs *);
+
+void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
+{
+	handle_arch_irq = handle_irq;
+}
+
+void __irq_entry do_IRQ(struct pt_regs *regs)
+{
+	handle_arch_irq(regs);
+}

arch/openrisc/kernel/module.c

@@ -0,0 +1,70 @@
+/*
+ * OpenRISC module.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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/moduleloader.h>
+#include <linux/elf.h>
+
+int apply_relocate_add(Elf32_Shdr *sechdrs,
+		       const char *strtab,
+		       unsigned int symindex,
+		       unsigned int relsec,
+		       struct module *me)
+{
+	unsigned int i;
+	Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+	Elf32_Sym *sym;
+	uint32_t *location;
+	uint32_t value;
+
+	pr_debug("Applying relocate section %u to %u\n", relsec,
+		 sechdrs[relsec].sh_info);
+	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+		/* This is where to make the change */
+		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+			+ rel[i].r_offset;
+
+		/* This is the symbol it is referring to.  Note that all
+		   undefined symbols have been resolved.  */
+		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+			+ ELF32_R_SYM(rel[i].r_info);
+		value = sym->st_value + rel[i].r_addend;
+
+		switch (ELF32_R_TYPE(rel[i].r_info)) {
+		case R_OR32_32:
+			*location = value;
+			break;
+		case R_OR32_CONST:
+			*((uint16_t *)location + 1) = value;
+			break;
+		case R_OR32_CONSTH:
+			*((uint16_t *)location + 1) = value >> 16;
+			break;
+		case R_OR32_JUMPTARG:
+			value -= (uint32_t)location;
+			value >>= 2;
+			value &= 0x03ffffff;
+			value |= *location & 0xfc000000;
+			*location = value;
+			break;
+		default:
+			pr_err("module %s: Unknown relocation: %u\n",
+			       me->name, ELF32_R_TYPE(rel[i].r_info));
+			break;
+		}
+	}
+
+	return 0;
+}

arch/openrisc/kernel/or32_ksyms.c

@@ -0,0 +1,46 @@
+/*
+ * OpenRISC or32_ksyms.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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/module.h>
+#include <linux/elfcore.h>
+#include <linux/sched.h>
+#include <linux/in6.h>
+#include <linux/interrupt.h>
+#include <linux/vmalloc.h>
+#include <linux/semaphore.h>
+
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <asm/checksum.h>
+#include <asm/io.h>
+#include <asm/hardirq.h>
+#include <asm/delay.h>
+#include <asm/pgalloc.h>
+
+#define DECLARE_EXPORT(name) extern void name(void); EXPORT_SYMBOL(name)
+
+/* compiler generated symbols */
+DECLARE_EXPORT(__udivsi3);
+DECLARE_EXPORT(__divsi3);
+DECLARE_EXPORT(__umodsi3);
+DECLARE_EXPORT(__modsi3);
+DECLARE_EXPORT(__muldi3);
+DECLARE_EXPORT(__ashrdi3);
+DECLARE_EXPORT(__ashldi3);
+DECLARE_EXPORT(__lshrdi3);
+
+EXPORT_SYMBOL(__copy_tofrom_user);

arch/openrisc/kernel/process.c

@@ -0,0 +1,261 @@
+/*
+ * OpenRISC process.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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 file handles the architecture-dependent parts of process handling...
+ */
+
+#define __KERNEL_SYSCALLS__
+#include <stdarg.h>
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/elfcore.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/init_task.h>
+#include <linux/mqueue.h>
+#include <linux/fs.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/spr_defs.h>
+
+#include <linux/smp.h>
+
+/*
+ * Pointer to Current thread info structure.
+ *
+ * Used at user space -> kernel transitions.
+ */
+struct thread_info *current_thread_info_set[NR_CPUS] = { &init_thread_info, };
+
+void machine_restart(void)
+{
+	printk(KERN_INFO "*** MACHINE RESTART ***\n");
+	__asm__("l.nop 1");
+}
+
+/*
+ * Similar to machine_power_off, but don't shut off power.  Add code
+ * here to freeze the system for e.g. post-mortem debug purpose when
+ * possible.  This halt has nothing to do with the idle halt.
+ */
+void machine_halt(void)
+{
+	printk(KERN_INFO "*** MACHINE HALT ***\n");
+	__asm__("l.nop 1");
+}
+
+/* If or when software power-off is implemented, add code here.  */
+void machine_power_off(void)
+{
+	printk(KERN_INFO "*** MACHINE POWER OFF ***\n");
+	__asm__("l.nop 1");
+}
+
+void (*pm_power_off) (void) = machine_power_off;
+
+/*
+ * When a process does an "exec", machine state like FPU and debug
+ * registers need to be reset.  This is a hook function for that.
+ * Currently we don't have any such state to reset, so this is empty.
+ */
+void flush_thread(void)
+{
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	extern void show_registers(struct pt_regs *regs);
+
+	show_regs_print_info(KERN_DEFAULT);
+	/* __PHX__ cleanup this mess */
+	show_registers(regs);
+}
+
+unsigned long thread_saved_pc(struct task_struct *t)
+{
+	return (unsigned long)user_regs(t->stack)->pc;
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+/*
+ * Copy the thread-specific (arch specific) info from the current
+ * process to the new one p
+ */
+extern asmlinkage void ret_from_fork(void);
+
+/*
+ * copy_thread
+ * @clone_flags: flags
+ * @usp: user stack pointer or fn for kernel thread
+ * @arg: arg to fn for kernel thread; always NULL for userspace thread
+ * @p: the newly created task
+ * @regs: CPU context to copy for userspace thread; always NULL for kthread
+ *
+ * At the top of a newly initialized kernel stack are two stacked pt_reg
+ * structures.  The first (topmost) is the userspace context of the thread.
+ * The second is the kernelspace context of the thread.
+ *
+ * A kernel thread will not be returning to userspace, so the topmost pt_regs
+ * struct can be uninitialized; it _does_ need to exist, though, because
+ * a kernel thread can become a userspace thread by doing a kernel_execve, in
+ * which case the topmost context will be initialized and used for 'returning'
+ * to userspace.
+ *
+ * The second pt_reg struct needs to be initialized to 'return' to
+ * ret_from_fork.  A kernel thread will need to set r20 to the address of
+ * a function to call into (with arg in r22); userspace threads need to set
+ * r20 to NULL in which case ret_from_fork will just continue a return to
+ * userspace.
+ *
+ * A kernel thread 'fn' may return; this is effectively what happens when
+ * kernel_execve is called.  In that case, the userspace pt_regs must have
+ * been initialized (which kernel_execve takes care of, see start_thread
+ * below); ret_from_fork will then continue its execution causing the
+ * 'kernel thread' to return to userspace as a userspace thread.
+ */
+
+int
+copy_thread(unsigned long clone_flags, unsigned long usp,
+	    unsigned long arg, struct task_struct *p)
+{
+	struct pt_regs *userregs;
+	struct pt_regs *kregs;
+	unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
+	unsigned long top_of_kernel_stack;
+
+	top_of_kernel_stack = sp;
+
+	p->set_child_tid = p->clear_child_tid = NULL;
+
+	/* Locate userspace context on stack... */
+	sp -= STACK_FRAME_OVERHEAD;	/* redzone */
+	sp -= sizeof(struct pt_regs);
+	userregs = (struct pt_regs *) sp;
+
+	/* ...and kernel context */
+	sp -= STACK_FRAME_OVERHEAD;	/* redzone */
+	sp -= sizeof(struct pt_regs);
+	kregs = (struct pt_regs *)sp;
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(kregs, 0, sizeof(struct pt_regs));
+		kregs->gpr[20] = usp; /* fn, kernel thread */
+		kregs->gpr[22] = arg;
+	} else {
+		*userregs = *current_pt_regs();
+
+		if (usp)
+			userregs->sp = usp;
+		userregs->gpr[11] = 0;	/* Result from fork() */
+
+		kregs->gpr[20] = 0;	/* Userspace thread */
+	}
+
+	/*
+	 * _switch wants the kernel stack page in pt_regs->sp so that it
+	 * can restore it to thread_info->ksp... see _switch for details.
+	 */
+	kregs->sp = top_of_kernel_stack;
+	kregs->gpr[9] = (unsigned long)ret_from_fork;
+
+	task_thread_info(p)->ksp = (unsigned long)kregs;
+
+	return 0;
+}
+
+/*
+ * Set up a thread for executing a new program
+ */
+void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
+{
+	unsigned long sr = mfspr(SPR_SR) & ~SPR_SR_SM;
+
+	set_fs(USER_DS);
+	memset(regs, 0, sizeof(struct pt_regs));
+
+	regs->pc = pc;
+	regs->sr = sr;
+	regs->sp = sp;
+}
+
+/* Fill in the fpu structure for a core dump.  */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu)
+{
+	/* TODO */
+	return 0;
+}
+
+extern struct thread_info *_switch(struct thread_info *old_ti,
+				   struct thread_info *new_ti);
+
+struct task_struct *__switch_to(struct task_struct *old,
+				struct task_struct *new)
+{
+	struct task_struct *last;
+	struct thread_info *new_ti, *old_ti;
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	/* current_set is an array of saved current pointers
+	 * (one for each cpu). we need them at user->kernel transition,
+	 * while we save them at kernel->user transition
+	 */
+	new_ti = new->stack;
+	old_ti = old->stack;
+
+	current_thread_info_set[smp_processor_id()] = new_ti;
+	last = (_switch(old_ti, new_ti))->task;
+
+	local_irq_restore(flags);
+
+	return last;
+}
+
+/*
+ * Write out registers in core dump format, as defined by the
+ * struct user_regs_struct
+ */
+void dump_elf_thread(elf_greg_t *dest, struct pt_regs* regs)
+{
+	dest[0] = 0; /* r0 */
+	memcpy(dest+1, regs->gpr+1, 31*sizeof(unsigned long));
+	dest[32] = regs->pc;
+	dest[33] = regs->sr;
+	dest[34] = 0;
+	dest[35] = 0;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	/* TODO */
+
+	return 0;
+}

arch/openrisc/kernel/prom.c

@@ -0,0 +1,32 @@
+/*
+ * OpenRISC prom.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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.
+ *
+ * Architecture specific procedures for creating, accessing and
+ * interpreting the device tree.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+
+#include <asm/page.h>
+
+void __init early_init_devtree(void *params)
+{
+	early_init_dt_scan(params);
+	memblock_allow_resize();
+}

arch/openrisc/kernel/ptrace.c

@@ -0,0 +1,205 @@
+/*
+ * OpenRISC ptrace.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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 <stddef.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/audit.h>
+#include <linux/regset.h>
+#include <linux/tracehook.h>
+#include <linux/elf.h>
+
+#include <asm/thread_info.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+/*
+ * Copy the thread state to a regset that can be interpreted by userspace.
+ *
+ * It doesn't matter what our internal pt_regs structure looks like.  The
+ * important thing is that we export a consistent view of the thread state
+ * to userspace.  As such, we need to make sure that the regset remains
+ * ABI compatible as defined by the struct user_regs_struct:
+ *
+ * (Each item is a 32-bit word)
+ * r0 = 0 (exported for clarity)
+ * 31 GPRS r1-r31
+ * PC (Program counter)
+ * SR (Supervision register)
+ */
+static int genregs_get(struct task_struct *target,
+		       const struct user_regset *regset,
+		       unsigned int pos, unsigned int count,
+		       void *kbuf, void __user * ubuf)
+{
+	const struct pt_regs *regs = task_pt_regs(target);
+	int ret;
+
+	/* r0 */
+	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  regs->gpr+1, 4, 4*32);
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				  &regs->pc, 4*32, 4*33);
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &regs->sr, 4*33, 4*34);
+	if (!ret)
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       4*34, -1);
+
+	return ret;
+}
+
+/*
+ * Set the thread state from a regset passed in via ptrace
+ */
+static int genregs_set(struct task_struct *target,
+		       const struct user_regset *regset,
+		       unsigned int pos, unsigned int count,
+		       const void *kbuf, const void __user * ubuf)
+{
+	struct pt_regs *regs = task_pt_regs(target);
+	int ret;
+
+	/* ignore r0 */
+	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
+	/* r1 - r31 */
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 regs->gpr+1, 4, 4*32);
+	/* PC */
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 &regs->pc, 4*32, 4*33);
+	/*
+	 * Skip SR and padding... userspace isn't allowed to changes bits in
+	 * the Supervision register
+	 */
+	if (!ret)
+		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+						4*33, -1);
+
+	return ret;
+}
+
+/*
+ * Define the register sets available on OpenRISC under Linux
+ */
+enum or1k_regset {
+	REGSET_GENERAL,
+};
+
+static const struct user_regset or1k_regsets[] = {
+	[REGSET_GENERAL] = {
+			    .core_note_type = NT_PRSTATUS,
+			    .n = ELF_NGREG,
+			    .size = sizeof(long),
+			    .align = sizeof(long),
+			    .get = genregs_get,
+			    .set = genregs_set,
+			    },
+};
+
+static const struct user_regset_view user_or1k_native_view = {
+	.name = "or1k",
+	.e_machine = EM_OPENRISC,
+	.regsets = or1k_regsets,
+	.n = ARRAY_SIZE(or1k_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+	return &user_or1k_native_view;
+}
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure the single step bit is not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+	pr_debug("ptrace_disable(): TODO\n");
+
+	user_disable_single_step(child);
+	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+}
+
+long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
+		 unsigned long data)
+{
+	int ret;
+
+	switch (request) {
+	default:
+		ret = ptrace_request(child, request, addr, data);
+		break;
+	}
+
+	return ret;
+}
+
+/*
+ * Notification of system call entry/exit
+ * - triggered by current->work.syscall_trace
+ */
+asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
+{
+	long ret = 0;
+
+	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+	    tracehook_report_syscall_entry(regs))
+		/*
+		 * Tracing decided this syscall should not happen.
+		 * We'll return a bogus call number to get an ENOSYS
+		 * error, but leave the original number in <something>.
+		 */
+		ret = -1L;
+
+	audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
+			    regs->gpr[5], regs->gpr[6]);
+
+	return ret ? : regs->gpr[11];
+}
+
+asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
+{
+	int step;
+
+	audit_syscall_exit(regs);
+
+	step = test_thread_flag(TIF_SINGLESTEP);
+	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(regs, step);
+}

arch/openrisc/kernel/setup.c

@@ -0,0 +1,379 @@
+/*
+ * OpenRISC setup.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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 file handles the architecture-dependent parts of initialization
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/serial.h>
+#include <linux/initrd.h>
+#include <linux/of_fdt.h>
+#include <linux/of.h>
+#include <linux/memblock.h>
+#include <linux/device.h>
+#include <linux/of_platform.h>
+
+#include <asm/sections.h>
+#include <asm/segment.h>
+#include <asm/pgtable.h>
+#include <asm/types.h>
+#include <asm/setup.h>
+#include <asm/io.h>
+#include <asm/cpuinfo.h>
+#include <asm/delay.h>
+
+#include "vmlinux.h"
+
+static unsigned long __init setup_memory(void)
+{
+	unsigned long bootmap_size;
+	unsigned long ram_start_pfn;
+	unsigned long free_ram_start_pfn;
+	unsigned long ram_end_pfn;
+	phys_addr_t memory_start, memory_end;
+	struct memblock_region *region;
+
+	memory_end = memory_start = 0;
+
+	/* Find main memory where is the kernel */
+	for_each_memblock(memory, region) {
+		memory_start = region->base;
+		memory_end = region->base + region->size;
+		printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
+		       memory_start, memory_end);
+	}
+
+	if (!memory_end) {
+		panic("No memory!");
+	}
+
+	ram_start_pfn = PFN_UP(memory_start);
+	/* free_ram_start_pfn is first page after kernel */
+	free_ram_start_pfn = PFN_UP(__pa(_end));
+	ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
+
+	max_pfn = ram_end_pfn;
+
+	/*
+	 * initialize the boot-time allocator (with low memory only).
+	 *
+	 * This makes the memory from the end of the kernel to the end of
+	 * RAM usable.
+	 * init_bootmem sets the global values min_low_pfn, max_low_pfn.
+	 */
+	bootmap_size = init_bootmem(free_ram_start_pfn,
+				    ram_end_pfn - ram_start_pfn);
+	free_bootmem(PFN_PHYS(free_ram_start_pfn),
+		     (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
+	reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
+			BOOTMEM_DEFAULT);
+
+	for_each_memblock(reserved, region) {
+		printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
+		       (u32) region->base, (u32) region->size);
+		reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
+	}
+
+	return ram_end_pfn;
+}
+
+struct cpuinfo cpuinfo;
+
+static void print_cpuinfo(void)
+{
+	unsigned long upr = mfspr(SPR_UPR);
+	unsigned long vr = mfspr(SPR_VR);
+	unsigned int version;
+	unsigned int revision;
+
+	version = (vr & SPR_VR_VER) >> 24;
+	revision = (vr & SPR_VR_REV);
+
+	printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
+	       version, revision, cpuinfo.clock_frequency / 1000000);
+
+	if (!(upr & SPR_UPR_UP)) {
+		printk(KERN_INFO
+		       "-- no UPR register... unable to detect configuration\n");
+		return;
+	}
+
+	if (upr & SPR_UPR_DCP)
+		printk(KERN_INFO
+		       "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
+		       cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1);
+	else
+		printk(KERN_INFO "-- dcache disabled\n");
+	if (upr & SPR_UPR_ICP)
+		printk(KERN_INFO
+		       "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
+		       cpuinfo.icache_size, cpuinfo.icache_block_size, 1);
+	else
+		printk(KERN_INFO "-- icache disabled\n");
+
+	if (upr & SPR_UPR_DMP)
+		printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
+		       1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
+		       1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
+	if (upr & SPR_UPR_IMP)
+		printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
+		       1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
+		       1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
+
+	printk(KERN_INFO "-- additional features:\n");
+	if (upr & SPR_UPR_DUP)
+		printk(KERN_INFO "-- debug unit\n");
+	if (upr & SPR_UPR_PCUP)
+		printk(KERN_INFO "-- performance counters\n");
+	if (upr & SPR_UPR_PMP)
+		printk(KERN_INFO "-- power management\n");
+	if (upr & SPR_UPR_PICP)
+		printk(KERN_INFO "-- PIC\n");
+	if (upr & SPR_UPR_TTP)
+		printk(KERN_INFO "-- timer\n");
+	if (upr & SPR_UPR_CUP)
+		printk(KERN_INFO "-- custom unit(s)\n");
+}
+
+void __init setup_cpuinfo(void)
+{
+	struct device_node *cpu;
+	unsigned long iccfgr, dccfgr;
+	unsigned long cache_set_size, cache_ways;
+
+	cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
+	if (!cpu)
+		panic("No compatible CPU found in device tree...\n");
+
+	iccfgr = mfspr(SPR_ICCFGR);
+	cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
+	cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
+	cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
+	cpuinfo.icache_size =
+	    cache_set_size * cache_ways * cpuinfo.icache_block_size;
+
+	dccfgr = mfspr(SPR_DCCFGR);
+	cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
+	cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
+	cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
+	cpuinfo.dcache_size =
+	    cache_set_size * cache_ways * cpuinfo.dcache_block_size;
+
+	if (of_property_read_u32(cpu, "clock-frequency",
+				 &cpuinfo.clock_frequency)) {
+		printk(KERN_WARNING
+		       "Device tree missing CPU 'clock-frequency' parameter."
+		       "Assuming frequency 25MHZ"
+		       "This is probably not what you want.");
+	}
+
+	of_node_put(cpu);
+
+	print_cpuinfo();
+}
+
+/**
+ * or32_early_setup
+ *
+ * Handles the pointer to the device tree that this kernel is to use
+ * for establishing the available platform devices.
+ *
+ * Falls back on built-in device tree in case null pointer is passed.
+ */
+
+void __init or32_early_setup(void *fdt)
+{
+	if (fdt)
+		pr_info("FDT at %p\n", fdt);
+	else {
+		fdt = __dtb_start;
+		pr_info("Compiled-in FDT at %p\n", fdt);
+	}
+	early_init_devtree(fdt);
+}
+
+static int __init openrisc_device_probe(void)
+{
+	of_platform_populate(NULL, NULL, NULL, NULL);
+
+	return 0;
+}
+
+device_initcall(openrisc_device_probe);
+
+static inline unsigned long extract_value_bits(unsigned long reg,
+					       short bit_nr, short width)
+{
+	return (reg >> bit_nr) & (0 << width);
+}
+
+static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
+{
+	while (!(mask & 0x1)) {
+		reg = reg >> 1;
+		mask = mask >> 1;
+	}
+	return mask & reg;
+}
+
+void __init detect_unit_config(unsigned long upr, unsigned long mask,
+			       char *text, void (*func) (void))
+{
+	if (text != NULL)
+		printk("%s", text);
+
+	if (upr & mask) {
+		if (func != NULL)
+			func();
+		else
+			printk("present\n");
+	} else
+		printk("not present\n");
+}
+
+/*
+ * calibrate_delay
+ *
+ * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
+ * from the clock frequency passed in via the device tree
+ *
+ */
+
+void calibrate_delay(void)
+{
+	const int *val;
+	struct device_node *cpu = NULL;
+	cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
+	val = of_get_property(cpu, "clock-frequency", NULL);
+	if (!val)
+		panic("no cpu 'clock-frequency' parameter in device tree");
+	loops_per_jiffy = *val / HZ;
+	pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
+		loops_per_jiffy / (500000 / HZ),
+		(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+	unsigned long max_low_pfn;
+
+	unflatten_and_copy_device_tree();
+
+	setup_cpuinfo();
+
+	/* process 1's initial memory region is the kernel code/data */
+	init_mm.start_code = (unsigned long)_stext;
+	init_mm.end_code = (unsigned long)_etext;
+	init_mm.end_data = (unsigned long)_edata;
+	init_mm.brk = (unsigned long)_end;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	initrd_start = (unsigned long)&__initrd_start;
+	initrd_end = (unsigned long)&__initrd_end;
+	if (initrd_start == initrd_end) {
+		initrd_start = 0;
+		initrd_end = 0;
+	}
+	initrd_below_start_ok = 1;
+#endif
+
+	/* setup bootmem allocator */
+	max_low_pfn = setup_memory();
+
+	/* paging_init() sets up the MMU and marks all pages as reserved */
+	paging_init();
+
+#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
+	if (!conswitchp)
+		conswitchp = &dummy_con;
+#endif
+
+	*cmdline_p = boot_command_line;
+
+	printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n");
+}
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+	unsigned long vr;
+	int version, revision;
+
+	vr = mfspr(SPR_VR);
+	version = (vr & SPR_VR_VER) >> 24;
+	revision = vr & SPR_VR_REV;
+
+	return seq_printf(m,
+			  "cpu\t\t: OpenRISC-%x\n"
+			  "revision\t: %d\n"
+			  "frequency\t: %ld\n"
+			  "dcache size\t: %d bytes\n"
+			  "dcache block size\t: %d bytes\n"
+			  "icache size\t: %d bytes\n"
+			  "icache block size\t: %d bytes\n"
+			  "immu\t\t: %d entries, %lu ways\n"
+			  "dmmu\t\t: %d entries, %lu ways\n"
+			  "bogomips\t: %lu.%02lu\n",
+			  version,
+			  revision,
+			  loops_per_jiffy * HZ,
+			  cpuinfo.dcache_size,
+			  cpuinfo.dcache_block_size,
+			  cpuinfo.icache_size,
+			  cpuinfo.icache_block_size,
+			  1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
+			  1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
+			  1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
+			  1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
+			  (loops_per_jiffy * HZ) / 500000,
+			  ((loops_per_jiffy * HZ) / 5000) % 100);
+}
+
+static void *c_start(struct seq_file *m, loff_t * pos)
+{
+	/* We only have one CPU... */
+	return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t * pos)
+{
+	++*pos;
+	return NULL;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+	.start = c_start,
+	.next = c_next,
+	.stop = c_stop,
+	.show = show_cpuinfo,
+};

arch/openrisc/kernel/signal.c

@@ -0,0 +1,328 @@
+/*
+ * OpenRISC signal.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/tracehook.h>
+
+#include <asm/processor.h>
+#include <asm/syscall.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+
+#define DEBUG_SIG 0
+
+struct rt_sigframe {
+	struct siginfo info;
+	struct ucontext uc;
+	unsigned char retcode[16];	/* trampoline code */
+};
+
+static int restore_sigcontext(struct pt_regs *regs,
+			      struct sigcontext __user *sc)
+{
+	int err = 0;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	/*
+	 * Restore the regs from &sc->regs.
+	 * (sc is already checked for VERIFY_READ since the sigframe was
+	 *  checked in sys_sigreturn previously)
+	 */
+	err |= __copy_from_user(regs, sc->regs.gpr, 32 * sizeof(unsigned long));
+	err |= __copy_from_user(&regs->pc, &sc->regs.pc, sizeof(unsigned long));
+	err |= __copy_from_user(&regs->sr, &sc->regs.sr, sizeof(unsigned long));
+
+	/* make sure the SM-bit is cleared so user-mode cannot fool us */
+	regs->sr &= ~SPR_SR_SM;
+
+	regs->orig_gpr11 = -1;	/* Avoid syscall restart checks */
+
+	/* TODO: the other ports use regs->orig_XX to disable syscall checks
+	 * after this completes, but we don't use that mechanism. maybe we can
+	 * use it now ?
+	 */
+
+	return err;
+}
+
+asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
+{
+	struct rt_sigframe *frame = (struct rt_sigframe __user *)regs->sp;
+	sigset_t set;
+
+	/*
+	 * Since we stacked the signal on a dword boundary,
+	 * then frame should be dword aligned here.  If it's
+	 * not, then the user is trying to mess with us.
+	 */
+	if (((long)frame) & 3)
+		goto badframe;
+
+	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+		goto badframe;
+	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+		goto badframe;
+
+	set_current_blocked(&set);
+
+	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
+		goto badframe;
+
+	if (restore_altstack(&frame->uc.uc_stack))
+		goto badframe;
+
+	return regs->gpr[11];
+
+badframe:
+	force_sig(SIGSEGV, current);
+	return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+	int err = 0;
+
+	/* copy the regs */
+	/* There should be no need to save callee-saved registers here...
+	 * ...but we save them anyway.  Revisit this
+	 */
+	err |= __copy_to_user(sc->regs.gpr, regs, 32 * sizeof(unsigned long));
+	err |= __copy_to_user(&sc->regs.pc, &regs->pc, sizeof(unsigned long));
+	err |= __copy_to_user(&sc->regs.sr, &regs->sr, sizeof(unsigned long));
+
+	return err;
+}
+
+static inline unsigned long align_sigframe(unsigned long sp)
+{
+	return sp & ~3UL;
+}
+
+/*
+ * Work out where the signal frame should go.  It's either on the user stack
+ * or the alternate stack.
+ */
+
+static inline void __user *get_sigframe(struct ksignal *ksig,
+					struct pt_regs *regs, size_t frame_size)
+{
+	unsigned long sp = regs->sp;
+
+	/* redzone */
+	sp -= STACK_FRAME_OVERHEAD;
+	sp = sigsp(sp, ksig);
+	sp = align_sigframe(sp - frame_size);
+
+	return (void __user *)sp;
+}
+
+/* grab and setup a signal frame.
+ *
+ * basically we stack a lot of state info, and arrange for the
+ * user-mode program to return to the kernel using either a
+ * trampoline which performs the syscall sigreturn, or a provided
+ * user-mode trampoline.
+ */
+static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
+			  struct pt_regs *regs)
+{
+	struct rt_sigframe *frame;
+	unsigned long return_ip;
+	int err = 0;
+
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
+
+	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+		return -EFAULT;
+
+	/* Create siginfo.  */
+	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+		err |= copy_siginfo_to_user(&frame->info, &ksig->info);
+
+	/* Create the ucontext.  */
+	err |= __put_user(0, &frame->uc.uc_flags);
+	err |= __put_user(NULL, &frame->uc.uc_link);
+	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
+	err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
+
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+	if (err)
+		return -EFAULT;
+
+	/* trampoline - the desired return ip is the retcode itself */
+	return_ip = (unsigned long)&frame->retcode;
+	/* This is:
+		l.ori r11,r0,__NR_sigreturn
+		l.sys 1
+	 */
+	err |= __put_user(0xa960,             (short *)(frame->retcode + 0));
+	err |= __put_user(__NR_rt_sigreturn,  (short *)(frame->retcode + 2));
+	err |= __put_user(0x20000001, (unsigned long *)(frame->retcode + 4));
+	err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8));
+
+	if (err)
+		return -EFAULT;
+
+	/* TODO what is the current->exec_domain stuff and invmap ? */
+
+	/* Set up registers for signal handler */
+	regs->pc = (unsigned long)ksig->ka.sa.sa_handler; /* what we enter NOW */
+	regs->gpr[9] = (unsigned long)return_ip;     /* what we enter LATER */
+	regs->gpr[3] = (unsigned long)ksig->sig;           /* arg 1: signo */
+	regs->gpr[4] = (unsigned long)&frame->info;  /* arg 2: (siginfo_t*) */
+	regs->gpr[5] = (unsigned long)&frame->uc;    /* arg 3: ucontext */
+
+	/* actually move the usp to reflect the stacked frame */
+	regs->sp = (unsigned long)frame;
+
+	return 0;
+}
+
+static inline void
+handle_signal(struct ksignal *ksig, struct pt_regs *regs)
+{
+	int ret;
+
+	ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
+
+	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
+}
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ *
+ * Also note that the regs structure given here as an argument, is the latest
+ * pushed pt_regs. It may or may not be the same as the first pushed registers
+ * when the initial usermode->kernelmode transition took place. Therefore
+ * we can use user_mode(regs) to see if we came directly from kernel or user
+ * mode below.
+ */
+
+int do_signal(struct pt_regs *regs, int syscall)
+{
+	struct ksignal ksig;
+	unsigned long continue_addr = 0;
+	unsigned long restart_addr = 0;
+	unsigned long retval = 0;
+	int restart = 0;
+
+	if (syscall) {
+		continue_addr = regs->pc;
+		restart_addr = continue_addr - 4;
+		retval = regs->gpr[11];
+
+		/*
+		 * Setup syscall restart here so that a debugger will
+		 * see the already changed PC.
+		 */
+		switch (retval) {
+		case -ERESTART_RESTARTBLOCK:
+			restart = -2;
+			/* Fall through */
+		case -ERESTARTNOHAND:
+		case -ERESTARTSYS:
+		case -ERESTARTNOINTR:
+			restart++;
+			regs->gpr[11] = regs->orig_gpr11;
+			regs->pc = restart_addr;
+			break;
+		}
+	}
+
+	/*
+	 * Get the signal to deliver.  During the call to get_signal the
+	 * debugger may change all our registers so we may need to revert
+	 * the decision to restart the syscall; specifically, if the PC is
+	 * changed, don't restart the syscall.
+	 */
+	if (get_signal(&ksig)) {
+		if (unlikely(restart) && regs->pc == restart_addr) {
+			if (retval == -ERESTARTNOHAND ||
+			    retval == -ERESTART_RESTARTBLOCK
+			    || (retval == -ERESTARTSYS
+			        && !(ksig.ka.sa.sa_flags & SA_RESTART))) {
+				/* No automatic restart */
+				regs->gpr[11] = -EINTR;
+				regs->pc = continue_addr;
+			}
+		}
+		handle_signal(&ksig, regs);
+	} else {
+		/* no handler */
+		restore_saved_sigmask();
+		/*
+		 * Restore pt_regs PC as syscall restart will be handled by
+		 * kernel without return to userspace
+		 */
+		if (unlikely(restart) && regs->pc == restart_addr) {
+			regs->pc = continue_addr;
+			return restart;
+		}
+	}
+
+	return 0;
+}
+
+asmlinkage int
+do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
+{
+	do {
+		if (likely(thread_flags & _TIF_NEED_RESCHED)) {
+			schedule();
+		} else {
+			if (unlikely(!user_mode(regs)))
+				return 0;
+			local_irq_enable();
+			if (thread_flags & _TIF_SIGPENDING) {
+				int restart = do_signal(regs, syscall);
+				if (unlikely(restart)) {
+					/*
+					 * Restart without handlers.
+					 * Deal with it without leaving
+					 * the kernel space.
+					 */
+					return restart;
+				}
+				syscall = 0;
+			} else {
+				clear_thread_flag(TIF_NOTIFY_RESUME);
+				tracehook_notify_resume(regs);
+			}
+		}
+		local_irq_disable();
+		thread_flags = current_thread_info()->flags;
+	} while (thread_flags & _TIF_WORK_MASK);
+	return 0;
+}

arch/openrisc/kernel/sys_call_table.c

@@ -0,0 +1,28 @@
+/*
+ * OpenRISC sys_call_table.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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/syscalls.h>
+#include <linux/signal.h>
+#include <linux/unistd.h>
+
+#include <asm/syscalls.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+void *sys_call_table[__NR_syscalls] = {
+#include <asm/unistd.h>
+};

arch/openrisc/kernel/time.c

@@ -0,0 +1,178 @@
+/*
+ * OpenRISC time.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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/kernel.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/interrupt.h>
+#include <linux/ftrace.h>
+
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/cpuinfo.h>
+
+static int openrisc_timer_set_next_event(unsigned long delta,
+					 struct clock_event_device *dev)
+{
+	u32 c;
+
+	/* Read 32-bit counter value, add delta, mask off the low 28 bits.
+	 * We're guaranteed delta won't be bigger than 28 bits because the
+	 * generic timekeeping code ensures that for us.
+	 */
+	c = mfspr(SPR_TTCR);
+	c += delta;
+	c &= SPR_TTMR_TP;
+
+	/* Set counter and enable interrupt.
+	 * Keep timer in continuous mode always.
+	 */
+	mtspr(SPR_TTMR, SPR_TTMR_CR | SPR_TTMR_IE | c);
+
+	return 0;
+}
+
+static void openrisc_timer_set_mode(enum clock_event_mode mode,
+				    struct clock_event_device *evt)
+{
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		pr_debug(KERN_INFO "%s: periodic\n", __func__);
+		BUG();
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+		pr_debug(KERN_INFO "%s: oneshot\n", __func__);
+		break;
+	case CLOCK_EVT_MODE_UNUSED:
+		pr_debug(KERN_INFO "%s: unused\n", __func__);
+		break;
+	case CLOCK_EVT_MODE_SHUTDOWN:
+		pr_debug(KERN_INFO "%s: shutdown\n", __func__);
+		break;
+	case CLOCK_EVT_MODE_RESUME:
+		pr_debug(KERN_INFO "%s: resume\n", __func__);
+		break;
+	}
+}
+
+/* This is the clock event device based on the OR1K tick timer.
+ * As the timer is being used as a continuous clock-source (required for HR
+ * timers) we cannot enable the PERIODIC feature.  The tick timer can run using
+ * one-shot events, so no problem.
+ */
+
+static struct clock_event_device clockevent_openrisc_timer = {
+	.name = "openrisc_timer_clockevent",
+	.features = CLOCK_EVT_FEAT_ONESHOT,
+	.rating = 300,
+	.set_next_event = openrisc_timer_set_next_event,
+	.set_mode = openrisc_timer_set_mode,
+};
+
+static inline void timer_ack(void)
+{
+	/* Clear the IP bit and disable further interrupts */
+	/* This can be done very simply... we just need to keep the timer
+	   running, so just maintain the CR bits while clearing the rest
+	   of the register
+	 */
+	mtspr(SPR_TTMR, SPR_TTMR_CR);
+}
+
+/*
+ * The timer interrupt is mostly handled in generic code nowadays... this
+ * function just acknowledges the interrupt and fires the event handler that
+ * has been set on the clockevent device by the generic time management code.
+ *
+ * This function needs to be called by the timer exception handler and that's
+ * all the exception handler needs to do.
+ */
+
+irqreturn_t __irq_entry timer_interrupt(struct pt_regs *regs)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+	struct clock_event_device *evt = &clockevent_openrisc_timer;
+
+	timer_ack();
+
+	/*
+	 * update_process_times() expects us to have called irq_enter().
+	 */
+	irq_enter();
+	evt->event_handler(evt);
+	irq_exit();
+
+	set_irq_regs(old_regs);
+
+	return IRQ_HANDLED;
+}
+
+static __init void openrisc_clockevent_init(void)
+{
+	clockevent_openrisc_timer.cpumask = cpumask_of(0);
+
+	/* We only have 28 bits */
+	clockevents_config_and_register(&clockevent_openrisc_timer,
+					cpuinfo.clock_frequency,
+					100, 0x0fffffff);
+
+}
+
+/**
+ * Clocksource: Based on OpenRISC timer/counter
+ *
+ * This sets up the OpenRISC Tick Timer as a clock source.  The tick timer
+ * is 32 bits wide and runs at the CPU clock frequency.
+ */
+
+static cycle_t openrisc_timer_read(struct clocksource *cs)
+{
+	return (cycle_t) mfspr(SPR_TTCR);
+}
+
+static struct clocksource openrisc_timer = {
+	.name = "openrisc_timer",
+	.rating = 200,
+	.read = openrisc_timer_read,
+	.mask = CLOCKSOURCE_MASK(32),
+	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static int __init openrisc_timer_init(void)
+{
+	if (clocksource_register_hz(&openrisc_timer, cpuinfo.clock_frequency))
+		panic("failed to register clocksource");
+
+	/* Enable the incrementer: 'continuous' mode with interrupt disabled */
+	mtspr(SPR_TTMR, SPR_TTMR_CR);
+
+	return 0;
+}
+
+void __init time_init(void)
+{
+	u32 upr;
+
+	upr = mfspr(SPR_UPR);
+	if (!(upr & SPR_UPR_TTP))
+		panic("Linux not supported on devices without tick timer");
+
+	openrisc_timer_init();
+	openrisc_clockevent_init();
+}

arch/openrisc/kernel/traps.c

@@ -0,0 +1,355 @@
+/*
+ * OpenRISC traps.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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.
+ *
+ *  Here we handle the break vectors not used by the system call
+ *  mechanism, as well as some general stack/register dumping
+ *  things.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/kallsyms.h>
+#include <asm/uaccess.h>
+
+#include <asm/segment.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+
+extern char _etext, _stext;
+
+int kstack_depth_to_print = 0x180;
+
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+{
+	return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
+}
+
+void show_trace(struct task_struct *task, unsigned long *stack)
+{
+	struct thread_info *context;
+	unsigned long addr;
+
+	context = (struct thread_info *)
+	    ((unsigned long)stack & (~(THREAD_SIZE - 1)));
+
+	while (valid_stack_ptr(context, stack)) {
+		addr = *stack++;
+		if (__kernel_text_address(addr)) {
+			printk(" [<%08lx>]", addr);
+			print_symbol(" %s", addr);
+			printk("\n");
+		}
+	}
+	printk(" =======================\n");
+}
+
+/* displays a short stack trace */
+void show_stack(struct task_struct *task, unsigned long *esp)
+{
+	unsigned long addr, *stack;
+	int i;
+
+	if (esp == NULL)
+		esp = (unsigned long *)&esp;
+
+	stack = esp;
+
+	printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
+	for (i = 0; i < kstack_depth_to_print; i++) {
+		if (kstack_end(stack))
+			break;
+		if (__get_user(addr, stack)) {
+			/* This message matches "failing address" marked
+			   s390 in ksymoops, so lines containing it will
+			   not be filtered out by ksymoops.  */
+			printk("Failing address 0x%lx\n", (unsigned long)stack);
+			break;
+		}
+		stack++;
+
+		printk("sp + %02d: 0x%08lx\n", i * 4, addr);
+	}
+	printk("\n");
+
+	show_trace(task, esp);
+
+	return;
+}
+
+void show_trace_task(struct task_struct *tsk)
+{
+	/*
+	 * TODO: SysRq-T trace dump...
+	 */
+}
+
+void show_registers(struct pt_regs *regs)
+{
+	int i;
+	int in_kernel = 1;
+	unsigned long esp;
+
+	esp = (unsigned long)(&regs->sp);
+	if (user_mode(regs))
+		in_kernel = 0;
+
+	printk("CPU #: %d\n"
+	       "   PC: %08lx    SR: %08lx    SP: %08lx\n",
+	       smp_processor_id(), regs->pc, regs->sr, regs->sp);
+	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
+	       0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
+	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
+	       regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
+	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
+	       regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
+	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
+	       regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
+	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
+	       regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
+	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
+	       regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
+	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
+	       regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
+	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
+	       regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
+	printk("  RES: %08lx oGPR11: %08lx\n",
+	       regs->gpr[11], regs->orig_gpr11);
+
+	printk("Process %s (pid: %d, stackpage=%08lx)\n",
+	       current->comm, current->pid, (unsigned long)current);
+	/*
+	 * When in-kernel, we also print out the stack and code at the
+	 * time of the fault..
+	 */
+	if (in_kernel) {
+
+		printk("\nStack: ");
+		show_stack(NULL, (unsigned long *)esp);
+
+		printk("\nCode: ");
+		if (regs->pc < PAGE_OFFSET)
+			goto bad;
+
+		for (i = -24; i < 24; i++) {
+			unsigned char c;
+			if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
+bad:
+				printk(" Bad PC value.");
+				break;
+			}
+
+			if (i == 0)
+				printk("(%02x) ", c);
+			else
+				printk("%02x ", c);
+		}
+	}
+	printk("\n");
+}
+
+void nommu_dump_state(struct pt_regs *regs,
+		      unsigned long ea, unsigned long vector)
+{
+	int i;
+	unsigned long addr, stack = regs->sp;
+
+	printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
+
+	printk("CPU #: %d\n"
+	       "   PC: %08lx    SR: %08lx    SP: %08lx\n",
+	       0, regs->pc, regs->sr, regs->sp);
+	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
+	       0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
+	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
+	       regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
+	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
+	       regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
+	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
+	       regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
+	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
+	       regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
+	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
+	       regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
+	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
+	       regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
+	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
+	       regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
+	printk("  RES: %08lx oGPR11: %08lx\n",
+	       regs->gpr[11], regs->orig_gpr11);
+
+	printk("Process %s (pid: %d, stackpage=%08lx)\n",
+	       ((struct task_struct *)(__pa(current)))->comm,
+	       ((struct task_struct *)(__pa(current)))->pid,
+	       (unsigned long)current);
+
+	printk("\nStack: ");
+	printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
+	for (i = 0; i < kstack_depth_to_print; i++) {
+		if (((long)stack & (THREAD_SIZE - 1)) == 0)
+			break;
+		stack++;
+
+		printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
+		       *((unsigned long *)(__pa(stack))));
+	}
+	printk("\n");
+
+	printk("Call Trace:   ");
+	i = 1;
+	while (((long)stack & (THREAD_SIZE - 1)) != 0) {
+		addr = *((unsigned long *)__pa(stack));
+		stack++;
+
+		if (kernel_text_address(addr)) {
+			if (i && ((i % 6) == 0))
+				printk("\n ");
+			printk(" [<%08lx>]", addr);
+			i++;
+		}
+	}
+	printk("\n");
+
+	printk("\nCode: ");
+
+	for (i = -24; i < 24; i++) {
+		unsigned char c;
+		c = ((unsigned char *)(__pa(regs->pc)))[i];
+
+		if (i == 0)
+			printk("(%02x) ", c);
+		else
+			printk("%02x ", c);
+	}
+	printk("\n");
+}
+
+/* This is normally the 'Oops' routine */
+void die(const char *str, struct pt_regs *regs, long err)
+{
+
+	console_verbose();
+	printk("\n%s#: %04lx\n", str, err & 0xffff);
+	show_registers(regs);
+#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
+	printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
+
+	/* shut down interrupts */
+	local_irq_disable();
+
+	__asm__ __volatile__("l.nop   1");
+	do {} while (1);
+#endif
+	do_exit(SIGSEGV);
+}
+
+/* This is normally the 'Oops' routine */
+void die_if_kernel(const char *str, struct pt_regs *regs, long err)
+{
+	if (user_mode(regs))
+		return;
+
+	die(str, regs, err);
+}
+
+void unhandled_exception(struct pt_regs *regs, int ea, int vector)
+{
+	printk("Unable to handle exception at EA =0x%x, vector 0x%x",
+	       ea, vector);
+	die("Oops", regs, 9);
+}
+
+void __init trap_init(void)
+{
+	/* Nothing needs to be done */
+}
+
+asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
+{
+	siginfo_t info;
+	memset(&info, 0, sizeof(info));
+	info.si_signo = SIGTRAP;
+	info.si_code = TRAP_TRACE;
+	info.si_addr = (void *)address;
+	force_sig_info(SIGTRAP, &info, current);
+
+	regs->pc += 4;
+}
+
+asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
+{
+	siginfo_t info;
+
+	if (user_mode(regs)) {
+		/* Send a SIGSEGV */
+		info.si_signo = SIGSEGV;
+		info.si_errno = 0;
+		/* info.si_code has been set above */
+		info.si_addr = (void *)address;
+		force_sig_info(SIGSEGV, &info, current);
+	} else {
+		printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
+		show_registers(regs);
+		die("Die:", regs, address);
+	}
+
+}
+
+asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
+{
+	siginfo_t info;
+
+	if (user_mode(regs)) {
+		/* Send a SIGBUS */
+		info.si_signo = SIGBUS;
+		info.si_errno = 0;
+		info.si_code = BUS_ADRERR;
+		info.si_addr = (void *)address;
+		force_sig_info(SIGBUS, &info, current);
+	} else {		/* Kernel mode */
+		printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
+		show_registers(regs);
+		die("Die:", regs, address);
+	}
+}
+
+asmlinkage void do_illegal_instruction(struct pt_regs *regs,
+				       unsigned long address)
+{
+	siginfo_t info;
+
+	if (user_mode(regs)) {
+		/* Send a SIGILL */
+		info.si_signo = SIGILL;
+		info.si_errno = 0;
+		info.si_code = ILL_ILLOPC;
+		info.si_addr = (void *)address;
+		force_sig_info(SIGBUS, &info, current);
+	} else {		/* Kernel mode */
+		printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
+		       address);
+		show_registers(regs);
+		die("Die:", regs, address);
+	}
+}

arch/openrisc/kernel/vmlinux.h

@@ -0,0 +1,8 @@
+#ifndef __OPENRISC_VMLINUX_H_
+#define __OPENRISC_VMLINUX_H_
+
+#ifdef CONFIG_BLK_DEV_INITRD
+extern char __initrd_start, __initrd_end;
+#endif
+
+#endif

arch/openrisc/kernel/vmlinux.lds.S

@@ -0,0 +1,115 @@
+/*
+ * OpenRISC vmlinux.lds.S
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ *      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.
+ *
+ * ld script for OpenRISC architecture
+ */
+
+/* TODO
+ *		- clean up __offset & stuff
+ *		- change all 8192 aligment to PAGE !!!
+ *		- recheck if all aligments are really needed
+ */
+
+#  define LOAD_OFFSET  PAGE_OFFSET
+#  define LOAD_BASE    PAGE_OFFSET
+
+#include <asm/page.h>
+#include <asm/cache.h>
+#include <asm-generic/vmlinux.lds.h>
+
+OUTPUT_FORMAT("elf32-or32", "elf32-or32", "elf32-or32")
+jiffies = jiffies_64 + 4;
+
+SECTIONS
+{
+        /* Read-only sections, merged into text segment: */
+        . = LOAD_BASE ;
+
+	/* _s_kernel_ro must be page aligned */
+	. = ALIGN(PAGE_SIZE);
+	_s_kernel_ro = .;
+
+        .text                   : AT(ADDR(.text) - LOAD_OFFSET)
+	{
+          _stext = .;
+	  TEXT_TEXT
+	  SCHED_TEXT
+	  LOCK_TEXT
+	  KPROBES_TEXT
+	  IRQENTRY_TEXT
+	  *(.fixup)
+	  *(.text.__*)
+	  _etext = .;
+	}
+	/* TODO: Check if fixup and text.__* are really necessary
+	 * fixup is definitely necessary
+	 */
+
+	_sdata = .;
+
+	/* Page alignment required for RO_DATA_SECTION */
+	RO_DATA_SECTION(PAGE_SIZE)
+	_e_kernel_ro = .;
+
+	/* Whatever comes after _e_kernel_ro had better be page-aligend, too */
+
+	/* 32 here is cacheline size... recheck this */
+	RW_DATA_SECTION(32, PAGE_SIZE, PAGE_SIZE)
+
+        _edata  =  .;
+
+	EXCEPTION_TABLE(4)
+	NOTES
+
+	/* Init code and data */
+	. = ALIGN(PAGE_SIZE);
+	__init_begin = .;
+
+	HEAD_TEXT_SECTION
+
+	/* Page aligned */
+	INIT_TEXT_SECTION(PAGE_SIZE)
+
+	/* Align __setup_start on 16 byte boundary */
+	INIT_DATA_SECTION(16)
+
+	PERCPU_SECTION(L1_CACHE_BYTES)
+
+        __init_end = .;
+
+	. = ALIGN(PAGE_SIZE);
+	.initrd			: AT(ADDR(.initrd) - LOAD_OFFSET)
+	{
+		__initrd_start = .;
+		*(.initrd)
+		__initrd_end = .;
+		FILL (0);
+                . = ALIGN (PAGE_SIZE);
+	}
+
+        __vmlinux_end = .;            /* last address of the physical file */
+
+	BSS_SECTION(0, 0, 0x20)
+
+        _end = .;
+
+	/* Throw in the debugging sections */
+	STABS_DEBUG
+	DWARF_DEBUG
+
+        /* Sections to be discarded -- must be last */
+	DISCARDS
+}