Initial import

1 files changed, 423 insertions, 0 deletions

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
new file mode 100644
index 000000000..f192a2a41
--- /dev/null
+++ b/arch/arm/kernel/process.c
@@ -0,0 +1,423 @@
+/*
+ *  linux/arch/arm/kernel/process.c
+ *
+ *  Copyright (C) 1996-2000 Russell King - Converted to ARM.
+ *  Original Copyright (C) 1995  Linus Torvalds
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <stdarg.h>
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/user.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/init.h>
+#include <linux/elfcore.h>
+#include <linux/pm.h>
+#include <linux/tick.h>
+#include <linux/utsname.h>
+#include <linux/uaccess.h>
+#include <linux/random.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/leds.h>
+
+#include <asm/processor.h>
+#include <asm/thread_notify.h>
+#include <asm/stacktrace.h>
+#include <asm/system_misc.h>
+#include <asm/mach/time.h>
+#include <asm/tls.h>
+#include <asm/vdso.h>
+
+#ifdef CONFIG_CC_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+static const char *processor_modes[] __maybe_unused = {
+  "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
+  "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
+  "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "MON_32" , "ABT_32" ,
+  "UK8_32" , "UK9_32" , "HYP_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
+};
+
+static const char *isa_modes[] __maybe_unused = {
+  "ARM" , "Thumb" , "Jazelle", "ThumbEE"
+};
+
+/*
+ * This is our default idle handler.
+ */
+
+void (*arm_pm_idle)(void);
+
+/*
+ * Called from the core idle loop.
+ */
+
+void arch_cpu_idle(void)
+{
+	if (arm_pm_idle)
+		arm_pm_idle();
+	else
+		cpu_do_idle();
+	local_irq_enable();
+}
+
+void arch_cpu_idle_prepare(void)
+{
+	local_fiq_enable();
+}
+
+void arch_cpu_idle_enter(void)
+{
+	ledtrig_cpu(CPU_LED_IDLE_START);
+#ifdef CONFIG_PL310_ERRATA_769419
+	wmb();
+#endif
+}
+
+void arch_cpu_idle_exit(void)
+{
+	ledtrig_cpu(CPU_LED_IDLE_END);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void arch_cpu_idle_dead(void)
+{
+	cpu_die();
+}
+#endif
+
+void __show_regs(struct pt_regs *regs)
+{
+	unsigned long flags;
+	char buf[64];
+
+	show_regs_print_info(KERN_DEFAULT);
+
+	print_symbol("PC is at %s\n", instruction_pointer(regs));
+	print_symbol("LR is at %s\n", regs->ARM_lr);
+	printk("pc : [<%08lx>]    lr : [<%08lx>]    psr: %08lx\n"
+	       "sp : %08lx  ip : %08lx  fp : %08lx\n",
+		regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
+		regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
+	printk("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
+		regs->ARM_r10, regs->ARM_r9,
+		regs->ARM_r8);
+	printk("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
+		regs->ARM_r7, regs->ARM_r6,
+		regs->ARM_r5, regs->ARM_r4);
+	printk("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
+		regs->ARM_r3, regs->ARM_r2,
+		regs->ARM_r1, regs->ARM_r0);
+
+	flags = regs->ARM_cpsr;
+	buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
+	buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
+	buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
+	buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
+	buf[4] = '\0';
+
+#ifndef CONFIG_CPU_V7M
+	printk("Flags: %s  IRQs o%s  FIQs o%s  Mode %s  ISA %s  Segment %s\n",
+		buf, interrupts_enabled(regs) ? "n" : "ff",
+		fast_interrupts_enabled(regs) ? "n" : "ff",
+		processor_modes[processor_mode(regs)],
+		isa_modes[isa_mode(regs)],
+		get_fs() == get_ds() ? "kernel" : "user");
+#else
+	printk("xPSR: %08lx\n", regs->ARM_cpsr);
+#endif
+
+#ifdef CONFIG_CPU_CP15
+	{
+		unsigned int ctrl;
+
+		buf[0] = '\0';
+#ifdef CONFIG_CPU_CP15_MMU
+		{
+			unsigned int transbase, dac;
+			asm("mrc p15, 0, %0, c2, c0\n\t"
+			    "mrc p15, 0, %1, c3, c0\n"
+			    : "=r" (transbase), "=r" (dac));
+			snprintf(buf, sizeof(buf), "  Table: %08x  DAC: %08x",
+			  	transbase, dac);
+		}
+#endif
+		asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
+
+		printk("Control: %08x%s\n", ctrl, buf);
+	}
+#endif
+}
+
+void show_regs(struct pt_regs * regs)
+{
+	__show_regs(regs);
+	dump_stack();
+}
+
+ATOMIC_NOTIFIER_HEAD(thread_notify_head);
+
+EXPORT_SYMBOL_GPL(thread_notify_head);
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+	thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
+}
+
+void flush_thread(void)
+{
+	struct thread_info *thread = current_thread_info();
+	struct task_struct *tsk = current;
+
+	flush_ptrace_hw_breakpoint(tsk);
+
+	memset(thread->used_cp, 0, sizeof(thread->used_cp));
+	memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
+	memset(&thread->fpstate, 0, sizeof(union fp_state));
+
+	flush_tls();
+
+	thread_notify(THREAD_NOTIFY_FLUSH, thread);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
+
+int
+copy_thread(unsigned long clone_flags, unsigned long stack_start,
+	    unsigned long stk_sz, struct task_struct *p)
+{
+	struct thread_info *thread = task_thread_info(p);
+	struct pt_regs *childregs = task_pt_regs(p);
+
+	memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
+
+	if (likely(!(p->flags & PF_KTHREAD))) {
+		*childregs = *current_pt_regs();
+		childregs->ARM_r0 = 0;
+		if (stack_start)
+			childregs->ARM_sp = stack_start;
+	} else {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		thread->cpu_context.r4 = stk_sz;
+		thread->cpu_context.r5 = stack_start;
+		childregs->ARM_cpsr = SVC_MODE;
+	}
+	thread->cpu_context.pc = (unsigned long)ret_from_fork;
+	thread->cpu_context.sp = (unsigned long)childregs;
+
+	clear_ptrace_hw_breakpoint(p);
+
+	if (clone_flags & CLONE_SETTLS)
+		thread->tp_value[0] = childregs->ARM_r3;
+	thread->tp_value[1] = get_tpuser();
+
+	thread_notify(THREAD_NOTIFY_COPY, thread);
+
+	return 0;
+}
+
+/*
+ * Fill in the task's elfregs structure for a core dump.
+ */
+int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
+{
+	elf_core_copy_regs(elfregs, task_pt_regs(t));
+	return 1;
+}
+
+/*
+ * fill in the fpe structure for a core dump...
+ */
+int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
+{
+	struct thread_info *thread = current_thread_info();
+	int used_math = thread->used_cp[1] | thread->used_cp[2];
+
+	if (used_math)
+		memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
+
+	return used_math != 0;
+}
+EXPORT_SYMBOL(dump_fpu);
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	struct stackframe frame;
+	unsigned long stack_page;
+	int count = 0;
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	frame.fp = thread_saved_fp(p);
+	frame.sp = thread_saved_sp(p);
+	frame.lr = 0;			/* recovered from the stack */
+	frame.pc = thread_saved_pc(p);
+	stack_page = (unsigned long)task_stack_page(p);
+	do {
+		if (frame.sp < stack_page ||
+		    frame.sp >= stack_page + THREAD_SIZE ||
+		    unwind_frame(&frame) < 0)
+			return 0;
+		if (!in_sched_functions(frame.pc))
+			return frame.pc;
+	} while (count ++ < 16);
+	return 0;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+	unsigned long range_end = mm->brk + 0x02000000;
+	return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
+}
+
+#ifdef CONFIG_MMU
+#ifdef CONFIG_KUSER_HELPERS
+/*
+ * The vectors page is always readable from user space for the
+ * atomic helpers. Insert it into the gate_vma so that it is visible
+ * through ptrace and /proc/<pid>/mem.
+ */
+static struct vm_area_struct gate_vma = {
+	.vm_start	= 0xffff0000,
+	.vm_end		= 0xffff0000 + PAGE_SIZE,
+	.vm_flags	= VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYEXEC,
+};
+
+static int __init gate_vma_init(void)
+{
+	gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
+	return 0;
+}
+arch_initcall(gate_vma_init);
+
+struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
+{
+	return &gate_vma;
+}
+
+int in_gate_area(struct mm_struct *mm, unsigned long addr)
+{
+	return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
+}
+
+int in_gate_area_no_mm(unsigned long addr)
+{
+	return in_gate_area(NULL, addr);
+}
+#define is_gate_vma(vma)	((vma) == &gate_vma)
+#else
+#define is_gate_vma(vma)	0
+#endif
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+	return is_gate_vma(vma) ? "[vectors]" : NULL;
+}
+
+/* If possible, provide a placement hint at a random offset from the
+ * stack for the sigpage and vdso pages.
+ */
+static unsigned long sigpage_addr(const struct mm_struct *mm,
+				  unsigned int npages)
+{
+	unsigned long offset;
+	unsigned long first;
+	unsigned long last;
+	unsigned long addr;
+	unsigned int slots;
+
+	first = PAGE_ALIGN(mm->start_stack);
+
+	last = TASK_SIZE - (npages << PAGE_SHIFT);
+
+	/* No room after stack? */
+	if (first > last)
+		return 0;
+
+	/* Just enough room? */
+	if (first == last)
+		return first;
+
+	slots = ((last - first) >> PAGE_SHIFT) + 1;
+
+	offset = get_random_int() % slots;
+
+	addr = first + (offset << PAGE_SHIFT);
+
+	return addr;
+}
+
+static struct page *signal_page;
+extern struct page *get_signal_page(void);
+
+static const struct vm_special_mapping sigpage_mapping = {
+	.name = "[sigpage]",
+	.pages = &signal_page,
+};
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+	unsigned long npages;
+	unsigned long addr;
+	unsigned long hint;
+	int ret = 0;
+
+	if (!signal_page)
+		signal_page = get_signal_page();
+	if (!signal_page)
+		return -ENOMEM;
+
+	npages = 1; /* for sigpage */
+	npages += vdso_total_pages;
+
+	down_write(&mm->mmap_sem);
+	hint = sigpage_addr(mm, npages);
+	addr = get_unmapped_area(NULL, hint, npages << PAGE_SHIFT, 0, 0);
+	if (IS_ERR_VALUE(addr)) {
+		ret = addr;
+		goto up_fail;
+	}
+
+	vma = _install_special_mapping(mm, addr, PAGE_SIZE,
+		VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
+		&sigpage_mapping);
+
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto up_fail;
+	}
+
+	mm->context.sigpage = addr;
+
+	/* Unlike the sigpage, failure to install the vdso is unlikely
+	 * to be fatal to the process, so no error check needed
+	 * here.
+	 */
+	arm_install_vdso(mm, addr + PAGE_SIZE);
+
+ up_fail:
+	up_write(&mm->mmap_sem);
+	return ret;
+}
+#endif