Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

Pull arm64 support from Catalin Marinas:
 "Linux support for the 64-bit ARM architecture (AArch64)

  Features currently supported:
   - 39-bit address space for user and kernel (each)
   - 4KB and 64KB page configurations
   - Compat (32-bit) user applications (ARMv7, EABI only)
   - Flattened Device Tree (mandated for all AArch64 platforms)
   - ARM generic timers"

* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (35 commits)
  arm64: ptrace: remove obsolete ptrace request numbers from user headers
  arm64: Do not set the SMP/nAMP processor bit
  arm64: MAINTAINERS update
  arm64: Build infrastructure
  arm64: Miscellaneous header files
  arm64: Generic timers support
  arm64: Loadable modules
  arm64: Miscellaneous library functions
  arm64: Performance counters support
  arm64: Add support for /proc/sys/debug/exception-trace
  arm64: Debugging support
  arm64: Floating point and SIMD
  arm64: 32-bit (compat) applications support
  arm64: User access library functions
  arm64: Signal handling support
  arm64: VDSO support
  arm64: System calls handling
  arm64: ELF definitions
  arm64: SMP support
  arm64: DMA mapping API
  ...

1 files changed, 348 insertions, 0 deletions

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
new file mode 100644
index 000000000000..3883f842434f
--- /dev/null
+++ b/arch/arm64/kernel/traps.c
@@ -0,0 +1,348 @@
+/*
+ * Based on arch/arm/kernel/traps.c
+ *
+ * Copyright (C) 1995-2009 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/signal.h>
+#include <linux/personality.h>
+#include <linux/kallsyms.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/hardirq.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+
+#include <asm/atomic.h>
+#include <asm/traps.h>
+#include <asm/stacktrace.h>
+#include <asm/exception.h>
+#include <asm/system_misc.h>
+
+static const char *handler[]= {
+        "Synchronous Abort",
+        "IRQ",
+        "FIQ",
+        "Error"
+};
+
+int show_unhandled_signals = 1;
+
+/*
+ * Dump out the contents of some memory nicely...
+ */
+static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
+                     unsigned long top)
+{
+        unsigned long first;
+        mm_segment_t fs;
+        int i;
+
+        /*
+         * We need to switch to kernel mode so that we can use __get_user
+         * to safely read from kernel space.  Note that we now dump the
+         * code first, just in case the backtrace kills us.
+         */
+        fs = get_fs();
+        set_fs(KERNEL_DS);
+
+        printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
+
+        for (first = bottom & ~31; first < top; first += 32) {
+                unsigned long p;
+                char str[sizeof(" 12345678") * 8 + 1];
+
+                memset(str, ' ', sizeof(str));
+                str[sizeof(str) - 1] = '\0';
+
+                for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
+                        if (p >= bottom && p < top) {
+                                unsigned int val;
+                                if (__get_user(val, (unsigned int *)p) == 0)
+                                        sprintf(str + i * 9, " %08x", val);
+                                else
+                                        sprintf(str + i * 9, " ????????");
+                        }
+                }
+                printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
+        }
+
+        set_fs(fs);
+}
+
+static void dump_backtrace_entry(unsigned long where, unsigned long stack)
+{
+        print_ip_sym(where);
+        if (in_exception_text(where))
+                dump_mem("", "Exception stack", stack,
+                         stack + sizeof(struct pt_regs));
+}
+
+static void dump_instr(const char *lvl, struct pt_regs *regs)
+{
+        unsigned long addr = instruction_pointer(regs);
+        mm_segment_t fs;
+        char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
+        int i;
+
+        /*
+         * We need to switch to kernel mode so that we can use __get_user
+         * to safely read from kernel space.  Note that we now dump the
+         * code first, just in case the backtrace kills us.
+         */
+        fs = get_fs();
+        set_fs(KERNEL_DS);
+
+        for (i = -4; i < 1; i++) {
+                unsigned int val, bad;
+
+                bad = __get_user(val, &((u32 *)addr)[i]);
+
+                if (!bad)
+                        p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
+                else {
+                        p += sprintf(p, "bad PC value");
+                        break;
+                }
+        }
+        printk("%sCode: %s\n", lvl, str);
+
+        set_fs(fs);
+}
+
+static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+{
+        struct stackframe frame;
+        const register unsigned long current_sp asm ("sp");
+
+        pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
+
+        if (!tsk)
+                tsk = current;
+
+        if (regs) {
+                frame.fp = regs->regs[29];
+                frame.sp = regs->sp;
+                frame.pc = regs->pc;
+        } else if (tsk == current) {
+                frame.fp = (unsigned long)__builtin_frame_address(0);
+                frame.sp = current_sp;
+                frame.pc = (unsigned long)dump_backtrace;
+        } else {
+                /*
+                 * task blocked in __switch_to
+                 */
+                frame.fp = thread_saved_fp(tsk);
+                frame.sp = thread_saved_sp(tsk);
+                frame.pc = thread_saved_pc(tsk);
+        }
+
+        printk("Call trace:\n");
+        while (1) {
+                unsigned long where = frame.pc;
+                int ret;
+
+                ret = unwind_frame(&frame);
+                if (ret < 0)
+                        break;
+                dump_backtrace_entry(where, frame.sp);
+        }
+}
+
+void dump_stack(void)
+{
+        dump_backtrace(NULL, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+        dump_backtrace(NULL, tsk);
+        barrier();
+}
+
+#ifdef CONFIG_PREEMPT
+#define S_PREEMPT " PREEMPT"
+#else
+#define S_PREEMPT ""
+#endif
+#ifdef CONFIG_SMP
+#define S_SMP " SMP"
+#else
+#define S_SMP ""
+#endif
+
+static int __die(const char *str, int err, struct thread_info *thread,
+                 struct pt_regs *regs)
+{
+        struct task_struct *tsk = thread->task;
+        static int die_counter;
+        int ret;
+
+        pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
+                 str, err, ++die_counter);
+
+        /* trap and error numbers are mostly meaningless on ARM */
+        ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV);
+        if (ret == NOTIFY_STOP)
+                return ret;
+
+        print_modules();
+        __show_regs(regs);
+        pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
+                 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
+
+        if (!user_mode(regs) || in_interrupt()) {
+                dump_mem(KERN_EMERG, "Stack: ", regs->sp,
+                         THREAD_SIZE + (unsigned long)task_stack_page(tsk));
+                dump_backtrace(regs, tsk);
+                dump_instr(KERN_EMERG, regs);
+        }
+
+        return ret;
+}
+
+static DEFINE_RAW_SPINLOCK(die_lock);
+
+/*
+ * This function is protected against re-entrancy.
+ */
+void die(const char *str, struct pt_regs *regs, int err)
+{
+        struct thread_info *thread = current_thread_info();
+        int ret;
+
+        oops_enter();
+
+        raw_spin_lock_irq(&die_lock);
+        console_verbose();
+        bust_spinlocks(1);
+        ret = __die(str, err, thread, regs);
+
+        if (regs && kexec_should_crash(thread->task))
+                crash_kexec(regs);
+
+        bust_spinlocks(0);
+        add_taint(TAINT_DIE);
+        raw_spin_unlock_irq(&die_lock);
+        oops_exit();
+
+        if (in_interrupt())
+                panic("Fatal exception in interrupt");
+        if (panic_on_oops)
+                panic("Fatal exception");
+        if (ret != NOTIFY_STOP)
+                do_exit(SIGSEGV);
+}
+
+void arm64_notify_die(const char *str, struct pt_regs *regs,
+                      struct siginfo *info, int err)
+{
+        if (user_mode(regs))
+                force_sig_info(info->si_signo, info, current);
+        else
+                die(str, regs, err);
+}
+
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
+{
+        siginfo_t info;
+        void __user *pc = (void __user *)instruction_pointer(regs);
+
+#ifdef CONFIG_COMPAT
+        /* check for AArch32 breakpoint instructions */
+        if (compat_user_mode(regs) && aarch32_break_trap(regs) == 0)
+                return;
+#endif
+
+        if (show_unhandled_signals) {
+                pr_info("%s[%d]: undefined instruction: pc=%p\n",
+                        current->comm, task_pid_nr(current), pc);
+                dump_instr(KERN_INFO, regs);
+        }
+
+        info.si_signo = SIGILL;
+        info.si_errno = 0;
+        info.si_code  = ILL_ILLOPC;
+        info.si_addr  = pc;
+
+        arm64_notify_die("Oops - undefined instruction", regs, &info, 0);
+}
+
+long compat_arm_syscall(struct pt_regs *regs);
+
+asmlinkage long do_ni_syscall(struct pt_regs *regs)
+{
+#ifdef CONFIG_COMPAT
+        long ret;
+        if (is_compat_task()) {
+                ret = compat_arm_syscall(regs);
+                if (ret != -ENOSYS)
+                        return ret;
+        }
+#endif
+
+        if (show_unhandled_signals) {
+                pr_info("%s[%d]: syscall %d\n", current->comm,
+                        task_pid_nr(current), (int)regs->syscallno);
+                dump_instr("", regs);
+                if (user_mode(regs))
+                        __show_regs(regs);
+        }
+
+        return sys_ni_syscall();
+}
+
+/*
+ * bad_mode handles the impossible case in the exception vector.
+ */
+asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
+{
+        console_verbose();
+
+        pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
+                handler[reason], esr);
+
+        die("Oops - bad mode", regs, 0);
+        local_irq_disable();
+        panic("bad mode");
+}
+
+void __pte_error(const char *file, int line, unsigned long val)
+{
+        printk("%s:%d: bad pte %016lx.\n", file, line, val);
+}
+
+void __pmd_error(const char *file, int line, unsigned long val)
+{
+        printk("%s:%d: bad pmd %016lx.\n", file, line, val);
+}
+
+void __pgd_error(const char *file, int line, unsigned long val)
+{
+        printk("%s:%d: bad pgd %016lx.\n", file, line, val);
+}
+
+void __init trap_init(void)
+{
+        return;
+}