zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/kernel/process.c b/ap/os/linux/linux-3.4.x/arch/arm/kernel/process.c
new file mode 100755
index 0000000..e0f534a
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/kernel/process.c
@@ -0,0 +1,645 @@
+/*
+ * 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/delay.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/init.h>
+#include <linux/cpu.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/cpuidle.h>
+#include <linux/console.h>
+
+#include <asm/cacheflush.h>
+#include <asm/processor.h>
+#include <asm/thread_notify.h>
+#include <asm/stacktrace.h>
+#include <asm/mach/time.h>
+
+/*add for HUB: CVE-2014-9870*/
+#include <asm/tls.h>
+
+#ifdef CONFIG_CC_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+s64 pm_enter_time = 0;
+static const char *processor_modes[] = {
+ "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" , "UK6_32" , "ABT_32" ,
+ "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
+};
+
+static const char *isa_modes[] = {
+ "ARM" , "Thumb" , "Jazelle", "ThumbEE"
+};
+
+extern void setup_mm_for_reboot(void);
+
+static volatile int hlt_counter;
+
+#ifdef CONFIG_SMP
+void arch_trigger_all_cpu_backtrace(void)
+{
+ smp_send_all_cpu_backtrace();
+}
+#endif
+
+void disable_hlt(void)
+{
+ hlt_counter++;
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void enable_hlt(void)
+{
+ hlt_counter--;
+}
+
+EXPORT_SYMBOL(enable_hlt);
+
+static int __init nohlt_setup(char *__unused)
+{
+ hlt_counter = 1;
+ return 1;
+}
+
+static int __init hlt_setup(char *__unused)
+{
+ hlt_counter = 0;
+ return 1;
+}
+
+__setup("nohlt", nohlt_setup);
+__setup("hlt", hlt_setup);
+
+extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
+typedef void (*phys_reset_t)(unsigned long);
+
+#ifdef CONFIG_ARM_FLUSH_CONSOLE_ON_RESTART
+void arm_machine_flush_console(void)
+{
+ printk("\n");
+ pr_emerg("Restarting %s\n", linux_banner);
+ if (console_trylock()) {
+ console_unlock();
+ return;
+ }
+
+ mdelay(50);
+
+ local_irq_disable();
+ if (!console_trylock())
+ pr_emerg("arm_restart: Console was locked! Busting\n");
+ else
+ pr_emerg("arm_restart: Console was locked!\n");
+ console_unlock();
+}
+#else
+void arm_machine_flush_console(void)
+{
+}
+#endif
+
+/*
+ * A temporary stack to use for CPU reset. This is static so that we
+ * don't clobber it with the identity mapping. When running with this
+ * stack, any references to the current task *will not work* so you
+ * should really do as little as possible before jumping to your reset
+ * code.
+ */
+static u64 soft_restart_stack[16];
+
+static void __soft_restart(void *addr)
+{
+ phys_reset_t phys_reset;
+
+ /* Take out a flat memory mapping. */
+ setup_mm_for_reboot();
+
+ /* Clean and invalidate caches */
+ flush_cache_all();
+
+ /* Turn off caching */
+ cpu_proc_fin();
+
+ /* Push out any further dirty data, and ensure cache is empty */
+ flush_cache_all();
+
+ /* Switch to the identity mapping. */
+ phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
+ phys_reset((unsigned long)addr);
+
+ /* Should never get here. */
+ BUG();
+}
+
+void soft_restart(unsigned long addr)
+{
+ u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
+
+ /* Disable interrupts first */
+ local_irq_disable();
+ local_fiq_disable();
+
+ /* Disable the L2 if we're the last man standing. */
+ if (num_online_cpus() == 1)
+ outer_disable();
+
+ /* Change to the new stack and continue with the reset. */
+ call_with_stack(__soft_restart, (void *)addr, (void *)stack);
+
+ /* Should never get here. */
+ BUG();
+}
+
+static void null_restart(char mode, const char *cmd)
+{
+}
+
+/*
+ * Function pointers to optional machine specific functions
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+void (*arm_pm_restart)(char str, const char *cmd) = null_restart;
+EXPORT_SYMBOL_GPL(arm_pm_restart);
+
+static void do_nothing(void *unused)
+{
+}
+
+/*
+ * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
+ * pm_idle and update to new pm_idle value. Required while changing pm_idle
+ * handler on SMP systems.
+ *
+ * Caller must have changed pm_idle to the new value before the call. Old
+ * pm_idle value will not be used by any CPU after the return of this function.
+ */
+void cpu_idle_wait(void)
+{
+ smp_mb();
+ /* kick all the CPUs so that they exit out of pm_idle */
+ smp_call_function(do_nothing, NULL, 1);
+}
+EXPORT_SYMBOL_GPL(cpu_idle_wait);
+
+/*
+ * This is our default idle handler.
+ */
+extern void pm_idle_sram_print(void);
+
+void (*arm_pm_idle)(void);
+
+static void default_idle(void)
+{
+ if (arm_pm_idle)
+ arm_pm_idle();
+ else
+ cpu_do_idle();
+ local_irq_enable();
+#ifdef CONFIG_PM
+ pm_idle_sram_print();
+#endif
+}
+
+void (*pm_idle)(void) = default_idle;
+EXPORT_SYMBOL(pm_idle);
+
+/*
+ * The idle thread, has rather strange semantics for calling pm_idle,
+ * but this is what x86 does and we need to do the same, so that
+ * things like cpuidle get called in the same way. The only difference
+ * is that we always respect 'hlt_counter' to prevent low power idle.
+ */
+void cpu_idle(void)
+{
+ local_fiq_enable();
+
+ /* endless idle loop with no priority at all */
+ while (1) {
+ idle_notifier_call_chain(IDLE_START);
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
+ while (!need_resched()) {
+#ifdef CONFIG_HOTPLUG_CPU
+ if (cpu_is_offline(smp_processor_id()))
+ cpu_die();
+#endif
+
+ /*
+ * We need to disable interrupts here
+ * to ensure we don't miss a wakeup call.
+ */
+ local_irq_disable();
+#ifdef CONFIG_PL310_ERRATA_769419
+ wmb();
+#endif
+ if (hlt_counter) {
+ local_irq_enable();
+ cpu_relax();
+ } else if (!need_resched()) {
+ stop_critical_timings();
+ pm_enter_time = ktime_to_us(ktime_get());
+ if (cpuidle_idle_call())
+ pm_idle();
+ start_critical_timings();
+ /*
+ * pm_idle functions must always
+ * return with IRQs enabled.
+ */
+ WARN_ON(irqs_disabled());
+ } else
+ local_irq_enable();
+ }
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
+ idle_notifier_call_chain(IDLE_END);
+ schedule_preempt_disabled();
+ }
+}
+
+static char reboot_mode = 'h';
+
+int __init reboot_setup(char *str)
+{
+ reboot_mode = str[0];
+ return 1;
+}
+
+__setup("reboot=", reboot_setup);
+
+void machine_shutdown(void)
+{
+#ifdef CONFIG_SMP
+
+ preempt_disable();
+
+ smp_send_stop();
+#endif
+}
+
+void machine_halt(void)
+{
+ machine_shutdown();
+ local_irq_disable();
+ while (1);
+}
+
+void machine_power_off(void)
+{
+ machine_shutdown();
+ if (pm_power_off)
+ pm_power_off();
+}
+
+void machine_restart(char *cmd)
+{
+ machine_shutdown();
+ arm_machine_flush_console();
+
+ arm_pm_restart(reboot_mode, cmd);
+
+ /* Give a grace period for failure to restart of 1s */
+ mdelay(1000);
+
+ /* Whoops - the platform was unable to reboot. Tell the user! */
+ printk("Reboot failed -- System halted\n");
+ local_irq_disable();
+ while (1);
+}
+
+void __show_regs(struct pt_regs *regs)
+{
+ unsigned long flags;
+ char buf[64];
+
+ printk("CPU: %d %s (%s %.*s)\n",
+ raw_smp_processor_id(), print_tainted(),
+ init_utsname()->release,
+ (int)strcspn(init_utsname()->version, " "),
+ init_utsname()->version);
+ 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';
+
+ 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");
+#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
+
+ //show_extra_register_data(regs, 128);
+}
+
+void show_regs(struct pt_regs * regs)
+{
+ printk("\n");
+ printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
+ __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));
+
+ 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 pt_regs *regs)
+{
+ struct thread_info *thread = task_thread_info(p);
+ struct pt_regs *childregs = task_pt_regs(p);
+
+ *childregs = *regs;
+ childregs->ARM_r0 = 0;
+ childregs->ARM_sp = stack_start;
+
+ memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
+ thread->cpu_context.sp = (unsigned long)childregs;
+ thread->cpu_context.pc = (unsigned long)ret_from_fork;
+
+ clear_ptrace_hw_breakpoint(p);
+
+ /*Fix for HUB: CVE-2014-9870*/
+ 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);
+
+/*
+ * Shuffle the argument into the correct register before calling the
+ * thread function. r4 is the thread argument, r5 is the pointer to
+ * the thread function, and r6 points to the exit function.
+ */
+extern void kernel_thread_helper(void);
+asm( ".pushsection .text\n"
+" .align\n"
+" .type kernel_thread_helper, #function\n"
+"kernel_thread_helper:\n"
+#ifdef CONFIG_TRACE_IRQFLAGS
+" bl trace_hardirqs_on\n"
+#endif
+" msr cpsr_c, r7\n"
+" mov r0, r4\n"
+" mov lr, r6\n"
+" mov pc, r5\n"
+" .size kernel_thread_helper, . - kernel_thread_helper\n"
+" .popsection");
+
+#ifdef CONFIG_ARM_UNWIND
+extern void kernel_thread_exit(long code);
+asm( ".pushsection .text\n"
+" .align\n"
+" .type kernel_thread_exit, #function\n"
+"kernel_thread_exit:\n"
+" .fnstart\n"
+" .cantunwind\n"
+" bl do_exit\n"
+" nop\n"
+" .fnend\n"
+" .size kernel_thread_exit, . - kernel_thread_exit\n"
+" .popsection");
+#else
+#define kernel_thread_exit do_exit
+#endif
+
+/*
+ * Create a kernel thread.
+ */
+pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+ struct pt_regs regs;
+
+ memset(®s, 0, sizeof(regs));
+
+ regs.ARM_r4 = (unsigned long)arg;
+ regs.ARM_r5 = (unsigned long)fn;
+ regs.ARM_r6 = (unsigned long)kernel_thread_exit;
+ regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
+ regs.ARM_pc = (unsigned long)kernel_thread_helper;
+ regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT;
+
+ return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+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
+
+/*
+ * CONFIG_SPLIT_PTLOCK_CPUS results in a page->ptl lock. If the lock is not
+ * initialized by pgtable_page_ctor() then a coredump of the vector page will
+ * fail.
+ */
+static int __init vectors_user_mapping_init_page(void)
+{
+ struct page *page;
+ unsigned long addr = 0xffff0000;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset_k(addr);
+ pud = pud_offset(pgd, addr);
+ pmd = pmd_offset(pud, addr);
+ page = pmd_page(*(pmd));
+
+ pgtable_page_ctor(page);
+
+ return 0;
+}
+late_initcall(vectors_user_mapping_init_page);
+
+/*
+ * The vectors page is always readable from user space for the
+ * atomic helpers and the signal restart code. Insert it into the
+ * gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
+ */
+static struct vm_area_struct gate_vma;
+
+static int __init gate_vma_init(void)
+{
+ gate_vma.vm_start = 0xffff0000;
+ gate_vma.vm_end = 0xffff0000 + PAGE_SIZE;
+ gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
+ gate_vma.vm_flags = VM_READ | VM_EXEC |
+ VM_MAYREAD | VM_MAYEXEC;
+ 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);
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ return (vma == &gate_vma) ? "[vectors]" : NULL;
+}
+#endif