8 files changed, 112 insertions, 75 deletions

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 322410be573c..0022b4d57f8b 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -608,33 +608,33 @@ call_fpe:
  THUMB( add     pc, r8                  )
         nop
 
-        W(mov)  pc, lr                          @ CP#0
+        movw_pc lr                              @ CP#0
         W(b)    do_fpe                          @ CP#1 (FPE)
         W(b)    do_fpe                          @ CP#2 (FPE)
-        W(mov)  pc, lr                          @ CP#3
+        movw_pc lr                              @ CP#3
 #ifdef CONFIG_CRUNCH
         b       crunch_task_enable              @ CP#4 (MaverickCrunch)
         b       crunch_task_enable              @ CP#5 (MaverickCrunch)
         b       crunch_task_enable              @ CP#6 (MaverickCrunch)
 #else
-        W(mov)  pc, lr                          @ CP#4
-        W(mov)  pc, lr                          @ CP#5
-        W(mov)  pc, lr                          @ CP#6
+        movw_pc lr                              @ CP#4
+        movw_pc lr                              @ CP#5
+        movw_pc lr                              @ CP#6
 #endif
-        W(mov)  pc, lr                          @ CP#7
-        W(mov)  pc, lr                          @ CP#8
-        W(mov)  pc, lr                          @ CP#9
+        movw_pc lr                              @ CP#7
+        movw_pc lr                              @ CP#8
+        movw_pc lr                              @ CP#9
 #ifdef CONFIG_VFP
         W(b)    do_vfp                          @ CP#10 (VFP)
         W(b)    do_vfp                          @ CP#11 (VFP)
 #else
-        W(mov)  pc, lr                          @ CP#10 (VFP)
-        W(mov)  pc, lr                          @ CP#11 (VFP)
+        movw_pc lr                              @ CP#10 (VFP)
+        movw_pc lr                              @ CP#11 (VFP)
 #endif
-        W(mov)  pc, lr                          @ CP#12
-        W(mov)  pc, lr                          @ CP#13
-        W(mov)  pc, lr                          @ CP#14 (Debug)
-        W(mov)  pc, lr                          @ CP#15 (Control)
+        movw_pc lr                              @ CP#12
+        movw_pc lr                              @ CP#13
+        movw_pc lr                              @ CP#14 (Debug)
+        movw_pc lr                              @ CP#15 (Control)
 
 #ifdef CONFIG_NEON
         .align  6
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index ac34c0d9384b..7e9ed1eea40a 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -110,6 +110,13 @@
         mov     \rd, sp, lsr #13
         mov     \rd, \rd, lsl #13
         .endm
+
+        @
+        @ 32-bit wide "mov pc, reg"
+        @
+        .macro  movw_pc, reg
+        mov     pc, \reg
+        .endm
 #else   /* CONFIG_THUMB2_KERNEL */
         .macro  svc_exit, rpsr
         clrex                                   @ clear the exclusive monitor
@@ -146,6 +153,14 @@
         lsr     \rd, \rd, #13
         mov     \rd, \rd, lsl #13
         .endm
+
+        @
+        @ 32-bit wide "mov pc, reg"
+        @
+        .macro  movw_pc, reg
+        mov     pc, \reg
+        nop
+        .endm
 #endif  /* !CONFIG_THUMB2_KERNEL */
 
 /*
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 790fbee92ec5..0d96d0171c05 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -328,6 +328,15 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
 }
 
 /*
+ * 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)
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 1423a3419789..2a573d4fea24 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -1,7 +1,7 @@
 /*
  *  linux/arch/arm/kernel/signal.c
  *
- *  Copyright (C) 1995-2002 Russell King
+ *  Copyright (C) 1995-2009 Russell King
  *
  * 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
@@ -29,6 +29,7 @@
  */
 #define SWI_SYS_SIGRETURN       (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
 #define SWI_SYS_RT_SIGRETURN    (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
+#define SWI_SYS_RESTART         (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
 
 /*
  * With EABI, the syscall number has to be loaded into r7.
@@ -49,6 +50,18 @@ const unsigned long sigreturn_codes[7] = {
 };
 
 /*
+ * Either we support OABI only, or we have EABI with the OABI
+ * compat layer enabled.  In the later case we don't know if
+ * user space is EABI or not, and if not we must not clobber r7.
+ * Always using the OABI syscall solves that issue and works for
+ * all those cases.
+ */
+const unsigned long syscall_restart_code[2] = {
+        SWI_SYS_RESTART,        /* swi  __NR_restart_syscall */
+        0xe49df004,             /* ldr  pc, [sp], #4 */
+};
+
+/*
  * atomically swap in the new signal mask, and wait for a signal.
  */
 asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
@@ -645,32 +658,12 @@ static void do_signal(struct pt_regs *regs, int syscall)
                                 regs->ARM_pc -= 4;
 #else
                                 u32 __user *usp;
-                                u32 swival = __NR_restart_syscall;
 
-                                regs->ARM_sp -= 12;
+                                regs->ARM_sp -= 4;
                                 usp = (u32 __user *)regs->ARM_sp;
 
-                                /*
-                                 * Either we supports OABI only, or we have
-                                 * EABI with the OABI compat layer enabled.
-                                 * In the later case we don't know if user
-                                 * space is EABI or not, and if not we must
-                                 * not clobber r7.  Always using the OABI
-                                 * syscall solves that issue and works for
-                                 * all those cases.
-                                 */
-                                swival = swival - __NR_SYSCALL_BASE + __NR_OABI_SYSCALL_BASE;
-
-                                put_user(regs->ARM_pc, &usp[0]);
-                                /* swi __NR_restart_syscall */
-                                put_user(0xef000000 | swival, &usp[1]);
-                                /* ldr  pc, [sp], #12 */
-                                put_user(0xe49df00c, &usp[2]);
-
-                                flush_icache_range((unsigned long)usp,
-                                                   (unsigned long)(usp + 3));
-
-                                regs->ARM_pc = regs->ARM_sp + 4;
+                                put_user(regs->ARM_pc, usp);
+                                regs->ARM_pc = KERN_RESTART_CODE;
 #endif
                         }
                 }
diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h
index 27beece15502..6fcfe8398aa4 100644
--- a/arch/arm/kernel/signal.h
+++ b/arch/arm/kernel/signal.h
@@ -1,12 +1,14 @@
 /*
  *  linux/arch/arm/kernel/signal.h
  *
- *  Copyright (C) 2005 Russell King.
+ *  Copyright (C) 2005-2009 Russell King.
  *
  * 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.
  */
 #define KERN_SIGRETURN_CODE     (CONFIG_VECTORS_BASE + 0x00000500)
+#define KERN_RESTART_CODE       (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes))
 
 extern const unsigned long sigreturn_codes[7];
+extern const unsigned long syscall_restart_code[2];
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 4cdc4a0bd02d..d38cdf2c8276 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/time.h>
 #include <linux/init.h>
+#include <linux/sched.h>
 #include <linux/smp.h>
 #include <linux/timex.h>
 #include <linux/errno.h>
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 467b69ed1021..95718a6b50a6 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -1,7 +1,7 @@
 /*
  *  linux/arch/arm/kernel/traps.c
  *
- *  Copyright (C) 1995-2002 Russell King
+ *  Copyright (C) 1995-2009 Russell King
  *  Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds
  *
  * This program is free software; you can redistribute it and/or modify
@@ -45,21 +45,21 @@ static int __init user_debug_setup(char *str)
 __setup("user_debug=", user_debug_setup);
 #endif
 
-static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+static void dump_mem(const char *, const char *, unsigned long, unsigned long);
 
 void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
 {
 #ifdef CONFIG_KALLSYMS
-        printk("[<%08lx>] ", where);
-        print_symbol("(%s) ", where);
-        printk("from [<%08lx>] ", from);
-        print_symbol("(%s)\n", from);
+        char sym1[KSYM_SYMBOL_LEN], sym2[KSYM_SYMBOL_LEN];
+        sprint_symbol(sym1, where);
+        sprint_symbol(sym2, from);
+        printk("[<%08lx>] (%s) from [<%08lx>] (%s)\n", where, sym1, from, sym2);
 #else
         printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
 #endif
 
         if (in_exception_text(where))
-                dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
+                dump_mem("", "Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
 }
 
 #ifndef CONFIG_ARM_UNWIND
@@ -81,9 +81,10 @@ static int verify_stack(unsigned long sp)
 /*
  * Dump out the contents of some memory nicely...
  */
-static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
+static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
+                     unsigned long top)
 {
-        unsigned long p = bottom & ~31;
+        unsigned long first;
         mm_segment_t fs;
         int i;
 
@@ -95,33 +96,37 @@ static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
         fs = get_fs();
         set_fs(KERNEL_DS);
 
-        printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
+        printk("%s%s(0x%08lx to 0x%08lx)\n", lvl, str, bottom, top);
 
-        for (p = bottom & ~31; p < top;) {
-                printk("%04lx: ", p & 0xffff);
+        for (first = bottom & ~31; first < top; first += 32) {
+                unsigned long p;
+                char str[sizeof(" 12345678") * 8 + 1];
 
-                for (i = 0; i < 8; i++, p += 4) {
-                        unsigned int val;
+                memset(str, ' ', sizeof(str));
+                str[sizeof(str) - 1] = '\0';
 
-                        if (p < bottom || p >= top)
-                                printk("         ");
-                        else {
-                                __get_user(val, (unsigned long *)p);
-                                printk("%08x ", val);
+                for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
+                        if (p >= bottom && p < top) {
+                                unsigned long val;
+                                if (__get_user(val, (unsigned long *)p) == 0)
+                                        sprintf(str + i * 9, " %08lx", val);
+                                else
+                                        sprintf(str + i * 9, " ????????");
                         }
                 }
-                printk ("\n");
+                printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
         }
 
         set_fs(fs);
 }
 
-static void dump_instr(struct pt_regs *regs)
+static void dump_instr(const char *lvl, struct pt_regs *regs)
 {
         unsigned long addr = instruction_pointer(regs);
         const int thumb = thumb_mode(regs);
         const int width = thumb ? 4 : 8;
         mm_segment_t fs;
+        char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
         int i;
 
         /*
@@ -132,7 +137,6 @@ static void dump_instr(struct pt_regs *regs)
         fs = get_fs();
         set_fs(KERNEL_DS);
 
-        printk("Code: ");
         for (i = -4; i < 1; i++) {
                 unsigned int val, bad;
 
@@ -142,13 +146,14 @@ static void dump_instr(struct pt_regs *regs)
                         bad = __get_user(val, &((u32 *)addr)[i]);
 
                 if (!bad)
-                        printk(i == 0 ? "(%0*x) " : "%0*x ", width, val);
+                        p += sprintf(p, i == 0 ? "(%0*x) " : "%0*x ",
+                                        width, val);
                 else {
-                        printk("bad PC value.");
+                        p += sprintf(p, "bad PC value");
                         break;
                 }
         }
-        printk("\n");
+        printk("%sCode: %s\n", lvl, str);
 
         set_fs(fs);
 }
@@ -224,18 +229,19 @@ static void __die(const char *str, int err, struct thread_info *thread, struct p
         struct task_struct *tsk = thread->task;
         static int die_counter;
 
-        printk("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
+        printk(KERN_EMERG "Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
                str, err, ++die_counter);
+        sysfs_printk_last_file();
         print_modules();
         __show_regs(regs);
-        printk("Process %s (pid: %d, stack limit = 0x%p)\n",
-                tsk->comm, task_pid_nr(tsk), thread + 1);
+        printk(KERN_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("Stack: ", regs->ARM_sp,
+                dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,
                          THREAD_SIZE + (unsigned long)task_stack_page(tsk));
                 dump_backtrace(regs, tsk);
-                dump_instr(regs);
+                dump_instr(KERN_EMERG, regs);
         }
 }
 
@@ -250,13 +256,14 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
 
         oops_enter();
 
-        console_verbose();
         spin_lock_irq(&die_lock);
+        console_verbose();
         bust_spinlocks(1);
         __die(str, err, thread, regs);
         bust_spinlocks(0);
         add_taint(TAINT_DIE);
         spin_unlock_irq(&die_lock);
+        oops_exit();
 
         if (in_interrupt())
                 panic("Fatal exception in interrupt");
@@ -264,7 +271,6 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
         if (panic_on_oops)
                 panic("Fatal exception");
 
-        oops_exit();
         do_exit(SIGSEGV);
 }
 
@@ -349,7 +355,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
         if (user_debug & UDBG_UNDEFINED) {
                 printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n",
                         current->comm, task_pid_nr(current), pc);
-                dump_instr(regs);
+                dump_instr(KERN_INFO, regs);
         }
 #endif
 
@@ -400,7 +406,7 @@ static int bad_syscall(int n, struct pt_regs *regs)
         if (user_debug & UDBG_SYSCALL) {
                 printk(KERN_ERR "[%d] %s: obsolete system call %08x.\n",
                         task_pid_nr(current), current->comm, n);
-                dump_instr(regs);
+                dump_instr(KERN_ERR, regs);
         }
 #endif
 
@@ -579,7 +585,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
         if (user_debug & UDBG_SYSCALL) {
                 printk("[%d] %s: arm syscall %d\n",
                        task_pid_nr(current), current->comm, no);
-                dump_instr(regs);
+                dump_instr("", regs);
                 if (user_mode(regs)) {
                         __show_regs(regs);
                         c_backtrace(regs->ARM_fp, processor_mode(regs));
@@ -656,7 +662,7 @@ baddataabort(int code, unsigned long instr, struct pt_regs *regs)
         if (user_debug & UDBG_BADABORT) {
                 printk(KERN_ERR "[%d] %s: bad data abort: code %d instr 0x%08lx\n",
                         task_pid_nr(current), current->comm, code, instr);
-                dump_instr(regs);
+                dump_instr(KERN_ERR, regs);
                 show_pte(current->mm, addr);
         }
 #endif
@@ -745,6 +751,8 @@ void __init early_trap_init(void)
          */
         memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes,
                sizeof(sigreturn_codes));
+        memcpy((void *)KERN_RESTART_CODE, syscall_restart_code,
+               sizeof(syscall_restart_code));
 
         flush_icache_range(vectors, vectors + PAGE_SIZE);
         modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 39baf1128bfa..786ac2b6914a 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -26,6 +26,15 @@
  * http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html
  */
 
+#if !defined (__ARM_EABI__)
+#warning Your compiler does not have EABI support.
+#warning    ARM unwind is known to compile only with EABI compilers.
+#warning    Change compiler or disable ARM_UNWIND option.
+#elif (__GNUC__ == 4 && __GNUC_MINOR__ <= 2)
+#warning Your compiler is too buggy; it is known to not compile ARM unwind support.
+#warning    Change compiler or disable ARM_UNWIND option.
+#endif
+
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>