[PATCH] s390: put sys_call_table into .rodata section and write protect it

[safe/jmp/linux-2.6] / arch / s390 / kernel / traps.c

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 8b90e95..12240c0 100644 (file)
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -14,7 +14,6 @@
  * 'Traps.c' handles hardware traps and faults after we have saved some
  * state in 'asm.s'.
  */
-#include <linux/config.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
@@ -29,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
+#include <linux/reboot.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -56,7 +56,6 @@ int sysctl_userprocess_debug = 0;
 
 extern pgm_check_handler_t do_protection_exception;
 extern pgm_check_handler_t do_dat_exception;
-extern pgm_check_handler_t do_pseudo_page_fault;
 #ifdef CONFIG_PFAULT
 extern int pfault_init(void);
 extern void pfault_fini(void);
@@ -67,13 +66,13 @@ extern pgm_check_handler_t do_monitor_call;
 
 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
 
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
 #define FOURLONG "%08lx %08lx %08lx %08lx\n"
 static int kstack_depth_to_print = 12;
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
 static int kstack_depth_to_print = 20;
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
 
 /*
  * For show_trace we have tree different stack to consider:
@@ -136,8 +135,8 @@ void show_trace(struct task_struct *task, unsigned long * stack)
        sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
                          S390_lowcore.async_stack);
        if (task)
-               __show_trace(sp, (unsigned long) task->thread_info,
-                            (unsigned long) task->thread_info + THREAD_SIZE);
+               __show_trace(sp, (unsigned long) task_stack_page(task),
+                            (unsigned long) task_stack_page(task) + THREAD_SIZE);
        else
                __show_trace(sp, S390_lowcore.thread_info,
                             S390_lowcore.thread_info + THREAD_SIZE);
@@ -150,13 +149,11 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        unsigned long *stack;
        int i;
 
-       // debugging aid: "show_stack(NULL);" prints the
-       // back trace for this cpu.
-
        if (!sp)
-               sp = task ? (unsigned long *) task->thread.ksp : __r15;
+               stack = task ? (unsigned long *) task->thread.ksp : __r15;
+       else
+               stack = sp;
 
-       stack = sp;
        for (i = 0; i < kstack_depth_to_print; i++) {
                if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
                        break;
@@ -240,7 +237,7 @@ char *task_show_regs(struct task_struct *task, char *buffer)
 {
        struct pt_regs *regs;
 
-       regs = __KSTK_PTREGS(task);
+       regs = task_pt_regs(task);
        buffer += sprintf(buffer, "task: %p, ksp: %p\n",
                       task, (void *)task->thread.ksp);
        buffer += sprintf(buffer, "User PSW : %p %p\n",
@@ -486,7 +483,7 @@ asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
                info.si_signo = signal;
                info.si_errno = 0;
                info.si_code = ILL_ILLOPC;
-               info.si_addr = (void *) location;
+               info.si_addr = (void __user *) location;
                do_trap(interruption_code, signal,
                        "illegal operation", regs, &info);
        }
@@ -668,11 +665,13 @@ asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code)
 
 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
 {
-       die("Kernel stack overflow", regs, 0);
+       bust_spinlocks(1);
+       printk("Kernel stack overflow.\n");
+       show_regs(regs);
+       bust_spinlocks(0);
        panic("Corrupt kernel stack, can't continue.");
 }
 
-
 /* init is done in lowcore.S and head.S */
 
 void __init trap_init(void)
@@ -700,26 +699,22 @@ void __init trap_init(void)
         pgm_check_table[0x11] = &do_dat_exception;
         pgm_check_table[0x12] = &translation_exception;
         pgm_check_table[0x13] = &special_op_exception;
-#ifndef CONFIG_ARCH_S390X
-       pgm_check_table[0x14] = &do_pseudo_page_fault;
-#else /* CONFIG_ARCH_S390X */
+#ifdef CONFIG_64BIT
         pgm_check_table[0x38] = &do_dat_exception;
        pgm_check_table[0x39] = &do_dat_exception;
        pgm_check_table[0x3A] = &do_dat_exception;
         pgm_check_table[0x3B] = &do_dat_exception;
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
         pgm_check_table[0x15] = &operand_exception;
         pgm_check_table[0x1C] = &space_switch_exception;
         pgm_check_table[0x1D] = &hfp_sqrt_exception;
        pgm_check_table[0x40] = &do_monitor_call;
 
        if (MACHINE_IS_VM) {
+#ifdef CONFIG_PFAULT
                /*
-                * First try to get pfault pseudo page faults going.
-                * If this isn't available turn on pagex page faults.
+                * Try to get pfault pseudo page faults going.
                 */
-#ifdef CONFIG_PFAULT
-               /* request the 0x2603 external interrupt */
                if (register_early_external_interrupt(0x2603, pfault_interrupt,
                                                      &ext_int_pfault) != 0)
                        panic("Couldn't request external interrupt 0x2603");
@@ -731,8 +726,5 @@ void __init trap_init(void)
                unregister_early_external_interrupt(0x2603, pfault_interrupt,
                                                    &ext_int_pfault);
 #endif
-#ifndef CONFIG_ARCH_S390X
-               cpcmd("SET PAGEX ON", NULL, 0);
-#endif
        }
 }