Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 738 insertions, 0 deletions

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
new file mode 100644
index 000000000000..8b90e9528b91
--- /dev/null
+++ b/arch/s390/kernel/traps.c
@@ -0,0 +1,738 @@
+/*
+ *  arch/s390/kernel/traps.c
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ *
+ *  Derived from "arch/i386/kernel/traps.c"
+ *    Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+/*
+ * '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>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/mathemu.h>
+#include <asm/cpcmd.h>
+#include <asm/s390_ext.h>
+#include <asm/lowcore.h>
+#include <asm/debug.h>
+
+/* Called from entry.S only */
+extern void handle_per_exception(struct pt_regs *regs);
+
+typedef void pgm_check_handler_t(struct pt_regs *, long);
+pgm_check_handler_t *pgm_check_table[128];
+
+#ifdef CONFIG_SYSCTL
+#ifdef CONFIG_PROCESS_DEBUG
+int sysctl_userprocess_debug = 1;
+#else
+int sysctl_userprocess_debug = 0;
+#endif
+#endif
+
+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);
+extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code);
+static ext_int_info_t ext_int_pfault;
+#endif
+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
+#define FOURLONG "%08lx %08lx %08lx %08lx\n"
+static int kstack_depth_to_print = 12;
+#else /* CONFIG_ARCH_S390X */
+#define FOURLONG "%016lx %016lx %016lx %016lx\n"
+static int kstack_depth_to_print = 20;
+#endif /* CONFIG_ARCH_S390X */
+
+/*
+ * For show_trace we have tree different stack to consider:
+ *   - the panic stack which is used if the kernel stack has overflown
+ *   - the asynchronous interrupt stack (cpu related)
+ *   - the synchronous kernel stack (process related)
+ * The stack trace can start at any of the three stack and can potentially
+ * touch all of them. The order is: panic stack, async stack, sync stack.
+ */
+static unsigned long
+__show_trace(unsigned long sp, unsigned long low, unsigned long high)
+{
+        struct stack_frame *sf;
+        struct pt_regs *regs;
+
+        while (1) {
+                sp = sp & PSW_ADDR_INSN;
+                if (sp < low || sp > high - sizeof(*sf))
+                        return sp;
+                sf = (struct stack_frame *) sp;
+                printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
+                print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
+                /* Follow the backchain. */
+                while (1) {
+                        low = sp;
+                        sp = sf->back_chain & PSW_ADDR_INSN;
+                        if (!sp)
+                                break;
+                        if (sp <= low || sp > high - sizeof(*sf))
+                                return sp;
+                        sf = (struct stack_frame *) sp;
+                        printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
+                        print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
+                }
+                /* Zero backchain detected, check for interrupt frame. */
+                sp = (unsigned long) (sf + 1);
+                if (sp <= low || sp > high - sizeof(*regs))
+                        return sp;
+                regs = (struct pt_regs *) sp;
+                printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
+                print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
+                low = sp;
+                sp = regs->gprs[15];
+        }
+}
+
+void show_trace(struct task_struct *task, unsigned long * stack)
+{
+        register unsigned long __r15 asm ("15");
+        unsigned long sp;
+
+        sp = (unsigned long) stack;
+        if (!sp)
+                sp = task ? task->thread.ksp : __r15;
+        printk("Call Trace:\n");
+#ifdef CONFIG_CHECK_STACK
+        sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
+                          S390_lowcore.panic_stack);
+#endif
+        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);
+        else
+                __show_trace(sp, S390_lowcore.thread_info,
+                             S390_lowcore.thread_info + THREAD_SIZE);
+        printk("\n");
+}
+
+void show_stack(struct task_struct *task, unsigned long *sp)
+{
+        register unsigned long * __r15 asm ("15");
+        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 = sp;
+        for (i = 0; i < kstack_depth_to_print; i++) {
+                if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
+                        break;
+                if (i && ((i * sizeof (long) % 32) == 0))
+                        printk("\n       ");
+                printk("%p ", (void *)*stack++);
+        }
+        printk("\n");
+        show_trace(task, sp);
+}
+
+/*
+ * The architecture-independent dump_stack generator
+ */
+void dump_stack(void)
+{
+        show_stack(0, 0);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void show_registers(struct pt_regs *regs)
+{
+        mm_segment_t old_fs;
+        char *mode;
+        int i;
+
+        mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
+        printk("%s PSW : %p %p",
+               mode, (void *) regs->psw.mask,
+               (void *) regs->psw.addr);
+        print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
+        printk("%s GPRS: " FOURLONG, mode,
+               regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
+        printk("           " FOURLONG,
+               regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
+        printk("           " FOURLONG,
+               regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
+        printk("           " FOURLONG,
+               regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
+
+#if 0
+        /* FIXME: this isn't needed any more but it changes the ksymoops
+         * input. To remove or not to remove ... */
+        save_access_regs(regs->acrs);
+        printk("%s ACRS: %08x %08x %08x %08x\n", mode,
+               regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]);
+        printk("           %08x %08x %08x %08x\n",
+               regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]);
+        printk("           %08x %08x %08x %08x\n",
+               regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]);
+        printk("           %08x %08x %08x %08x\n",
+               regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]);
+#endif
+
+        /*
+         * Print the first 20 byte of the instruction stream at the
+         * time of the fault.
+         */
+        old_fs = get_fs();
+        if (regs->psw.mask & PSW_MASK_PSTATE)
+                set_fs(USER_DS);
+        else
+                set_fs(KERNEL_DS);
+        printk("%s Code: ", mode);
+        for (i = 0; i < 20; i++) {
+                unsigned char c;
+                if (__get_user(c, (char __user *)(regs->psw.addr + i))) {
+                        printk(" Bad PSW.");
+                        break;
+                }
+                printk("%02x ", c);
+        }
+        set_fs(old_fs);
+
+        printk("\n");
+}       
+
+/* This is called from fs/proc/array.c */
+char *task_show_regs(struct task_struct *task, char *buffer)
+{
+        struct pt_regs *regs;
+
+        regs = __KSTK_PTREGS(task);
+        buffer += sprintf(buffer, "task: %p, ksp: %p\n",
+                       task, (void *)task->thread.ksp);
+        buffer += sprintf(buffer, "User PSW : %p %p\n",
+                       (void *) regs->psw.mask, (void *)regs->psw.addr);
+
+        buffer += sprintf(buffer, "User GPRS: " FOURLONG,
+                          regs->gprs[0], regs->gprs[1],
+                          regs->gprs[2], regs->gprs[3]);
+        buffer += sprintf(buffer, "           " FOURLONG,
+                          regs->gprs[4], regs->gprs[5],
+                          regs->gprs[6], regs->gprs[7]);
+        buffer += sprintf(buffer, "           " FOURLONG,
+                          regs->gprs[8], regs->gprs[9],
+                          regs->gprs[10], regs->gprs[11]);
+        buffer += sprintf(buffer, "           " FOURLONG,
+                          regs->gprs[12], regs->gprs[13],
+                          regs->gprs[14], regs->gprs[15]);
+        buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
+                          task->thread.acrs[0], task->thread.acrs[1],
+                          task->thread.acrs[2], task->thread.acrs[3]);
+        buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
+                          task->thread.acrs[4], task->thread.acrs[5],
+                          task->thread.acrs[6], task->thread.acrs[7]);
+        buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
+                          task->thread.acrs[8], task->thread.acrs[9],
+                          task->thread.acrs[10], task->thread.acrs[11]);
+        buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
+                          task->thread.acrs[12], task->thread.acrs[13],
+                          task->thread.acrs[14], task->thread.acrs[15]);
+        return buffer;
+}
+
+DEFINE_SPINLOCK(die_lock);
+
+void die(const char * str, struct pt_regs * regs, long err)
+{
+        static int die_counter;
+
+        debug_stop_all();
+        console_verbose();
+        spin_lock_irq(&die_lock);
+        bust_spinlocks(1);
+        printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
+        show_regs(regs);
+        bust_spinlocks(0);
+        spin_unlock_irq(&die_lock);
+        if (in_interrupt())
+                panic("Fatal exception in interrupt");
+        if (panic_on_oops)
+                panic("Fatal exception: panic_on_oops");
+        do_exit(SIGSEGV);
+}
+
+static void inline
+report_user_fault(long interruption_code, struct pt_regs *regs)
+{
+#if defined(CONFIG_SYSCTL)
+        if (!sysctl_userprocess_debug)
+                return;
+#endif
+#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
+        printk("User process fault: interruption code 0x%lX\n",
+               interruption_code);
+        show_regs(regs);
+#endif
+}
+
+static void inline do_trap(long interruption_code, int signr, char *str,
+                           struct pt_regs *regs, siginfo_t *info)
+{
+        /*
+         * We got all needed information from the lowcore and can
+         * now safely switch on interrupts.
+         */
+        if (regs->psw.mask & PSW_MASK_PSTATE)
+                local_irq_enable();
+
+        if (regs->psw.mask & PSW_MASK_PSTATE) {
+                struct task_struct *tsk = current;
+
+                tsk->thread.trap_no = interruption_code & 0xffff;
+                force_sig_info(signr, info, tsk);
+                report_user_fault(interruption_code, regs);
+        } else {
+                const struct exception_table_entry *fixup;
+                fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
+                if (fixup)
+                        regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
+                else
+                        die(str, regs, interruption_code);
+        }
+}
+
+static inline void *get_check_address(struct pt_regs *regs)
+{
+        return (void *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
+}
+
+void do_single_step(struct pt_regs *regs)
+{
+        if ((current->ptrace & PT_PTRACED) != 0)
+                force_sig(SIGTRAP, current);
+}
+
+asmlinkage void
+default_trap_handler(struct pt_regs * regs, long interruption_code)
+{
+        if (regs->psw.mask & PSW_MASK_PSTATE) {
+                local_irq_enable();
+                do_exit(SIGSEGV);
+                report_user_fault(interruption_code, regs);
+        } else
+                die("Unknown program exception", regs, interruption_code);
+}
+
+#define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
+asmlinkage void name(struct pt_regs * regs, long interruption_code) \
+{ \
+        siginfo_t info; \
+        info.si_signo = signr; \
+        info.si_errno = 0; \
+        info.si_code = sicode; \
+        info.si_addr = (void *)siaddr; \
+        do_trap(interruption_code, signr, str, regs, &info); \
+}
+
+DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
+              ILL_ILLADR, get_check_address(regs))
+DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
+              ILL_ILLOPN, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
+              FPE_INTDIV, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "fixpoint overflow exception", overflow_exception,
+              FPE_INTOVF, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "HFP overflow exception", hfp_overflow_exception,
+              FPE_FLTOVF, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "HFP underflow exception", hfp_underflow_exception,
+              FPE_FLTUND, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "HFP significance exception", hfp_significance_exception,
+              FPE_FLTRES, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "HFP divide exception", hfp_divide_exception,
+              FPE_FLTDIV, get_check_address(regs))
+DO_ERROR_INFO(SIGFPE,  "HFP square root exception", hfp_sqrt_exception,
+              FPE_FLTINV, get_check_address(regs))
+DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
+              ILL_ILLOPN, get_check_address(regs))
+DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
+              ILL_PRVOPC, get_check_address(regs))
+DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
+              ILL_ILLOPN, get_check_address(regs))
+DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
+              ILL_ILLOPN, get_check_address(regs))
+
+static inline void
+do_fp_trap(struct pt_regs *regs, void *location,
+           int fpc, long interruption_code)
+{
+        siginfo_t si;
+
+        si.si_signo = SIGFPE;
+        si.si_errno = 0;
+        si.si_addr = location;
+        si.si_code = 0;
+        /* FPC[2] is Data Exception Code */
+        if ((fpc & 0x00000300) == 0) {
+                /* bits 6 and 7 of DXC are 0 iff IEEE exception */
+                if (fpc & 0x8000) /* invalid fp operation */
+                        si.si_code = FPE_FLTINV;
+                else if (fpc & 0x4000) /* div by 0 */
+                        si.si_code = FPE_FLTDIV;
+                else if (fpc & 0x2000) /* overflow */
+                        si.si_code = FPE_FLTOVF;
+                else if (fpc & 0x1000) /* underflow */
+                        si.si_code = FPE_FLTUND;
+                else if (fpc & 0x0800) /* inexact */
+                        si.si_code = FPE_FLTRES;
+        }
+        current->thread.ieee_instruction_pointer = (addr_t) location;
+        do_trap(interruption_code, SIGFPE,
+                "floating point exception", regs, &si);
+}
+
+asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
+{
+        siginfo_t info;
+        __u8 opcode[6];
+        __u16 *location;
+        int signal = 0;
+
+        location = (__u16 *) get_check_address(regs);
+
+        /*
+         * We got all needed information from the lowcore and can
+         * now safely switch on interrupts.
+         */
+        if (regs->psw.mask & PSW_MASK_PSTATE)
+                local_irq_enable();
+
+        if (regs->psw.mask & PSW_MASK_PSTATE) {
+                get_user(*((__u16 *) opcode), (__u16 __user *) location);
+                if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
+                        if (current->ptrace & PT_PTRACED)
+                                force_sig(SIGTRAP, current);
+                        else
+                                signal = SIGILL;
+#ifdef CONFIG_MATHEMU
+                } else if (opcode[0] == 0xb3) {
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_b3(opcode, regs);
+                } else if (opcode[0] == 0xed) {
+                        get_user(*((__u32 *) (opcode+2)),
+                                 (__u32 *)(location+1));
+                        signal = math_emu_ed(opcode, regs);
+                } else if (*((__u16 *) opcode) == 0xb299) {
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_srnm(opcode, regs);
+                } else if (*((__u16 *) opcode) == 0xb29c) {
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_stfpc(opcode, regs);
+                } else if (*((__u16 *) opcode) == 0xb29d) {
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_lfpc(opcode, regs);
+#endif
+                } else
+                        signal = SIGILL;
+        } else
+                signal = SIGILL;
+
+#ifdef CONFIG_MATHEMU
+        if (signal == SIGFPE)
+                do_fp_trap(regs, location,
+                           current->thread.fp_regs.fpc, interruption_code);
+        else if (signal == SIGSEGV) {
+                info.si_signo = signal;
+                info.si_errno = 0;
+                info.si_code = SEGV_MAPERR;
+                info.si_addr = (void *) location;
+                do_trap(interruption_code, signal,
+                        "user address fault", regs, &info);
+        } else
+#endif
+        if (signal) {
+                info.si_signo = signal;
+                info.si_errno = 0;
+                info.si_code = ILL_ILLOPC;
+                info.si_addr = (void *) location;
+                do_trap(interruption_code, signal,
+                        "illegal operation", regs, &info);
+        }
+}
+
+
+#ifdef CONFIG_MATHEMU
+asmlinkage void 
+specification_exception(struct pt_regs * regs, long interruption_code)
+{
+        __u8 opcode[6];
+        __u16 *location = NULL;
+        int signal = 0;
+
+        location = (__u16 *) get_check_address(regs);
+
+        /*
+         * We got all needed information from the lowcore and can
+         * now safely switch on interrupts.
+         */
+        if (regs->psw.mask & PSW_MASK_PSTATE)
+                local_irq_enable();
+
+        if (regs->psw.mask & PSW_MASK_PSTATE) {
+                get_user(*((__u16 *) opcode), location);
+                switch (opcode[0]) {
+                case 0x28: /* LDR Rx,Ry   */
+                        signal = math_emu_ldr(opcode);
+                        break;
+                case 0x38: /* LER Rx,Ry   */
+                        signal = math_emu_ler(opcode);
+                        break;
+                case 0x60: /* STD R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_std(opcode, regs);
+                        break;
+                case 0x68: /* LD R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_ld(opcode, regs);
+                        break;
+                case 0x70: /* STE R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_ste(opcode, regs);
+                        break;
+                case 0x78: /* LE R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_le(opcode, regs);
+                        break;
+                default:
+                        signal = SIGILL;
+                        break;
+                }
+        } else
+                signal = SIGILL;
+
+        if (signal == SIGFPE)
+                do_fp_trap(regs, location,
+                           current->thread.fp_regs.fpc, interruption_code);
+        else if (signal) {
+                siginfo_t info;
+                info.si_signo = signal;
+                info.si_errno = 0;
+                info.si_code = ILL_ILLOPN;
+                info.si_addr = location;
+                do_trap(interruption_code, signal, 
+                        "specification exception", regs, &info);
+        }
+}
+#else
+DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
+              ILL_ILLOPN, get_check_address(regs));
+#endif
+
+asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
+{
+        __u16 *location;
+        int signal = 0;
+
+        location = (__u16 *) get_check_address(regs);
+
+        /*
+         * We got all needed information from the lowcore and can
+         * now safely switch on interrupts.
+         */
+        if (regs->psw.mask & PSW_MASK_PSTATE)
+                local_irq_enable();
+
+        if (MACHINE_HAS_IEEE)
+                __asm__ volatile ("stfpc %0\n\t" 
+                                  : "=m" (current->thread.fp_regs.fpc));
+
+#ifdef CONFIG_MATHEMU
+        else if (regs->psw.mask & PSW_MASK_PSTATE) {
+                __u8 opcode[6];
+                get_user(*((__u16 *) opcode), location);
+                switch (opcode[0]) {
+                case 0x28: /* LDR Rx,Ry   */
+                        signal = math_emu_ldr(opcode);
+                        break;
+                case 0x38: /* LER Rx,Ry   */
+                        signal = math_emu_ler(opcode);
+                        break;
+                case 0x60: /* STD R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_std(opcode, regs);
+                        break;
+                case 0x68: /* LD R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_ld(opcode, regs);
+                        break;
+                case 0x70: /* STE R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_ste(opcode, regs);
+                        break;
+                case 0x78: /* LE R,D(X,B) */
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_le(opcode, regs);
+                        break;
+                case 0xb3:
+                        get_user(*((__u16 *) (opcode+2)), location+1);
+                        signal = math_emu_b3(opcode, regs);
+                        break;
+                case 0xed:
+                        get_user(*((__u32 *) (opcode+2)),
+                                 (__u32 *)(location+1));
+                        signal = math_emu_ed(opcode, regs);
+                        break;
+                case 0xb2:
+                        if (opcode[1] == 0x99) {
+                                get_user(*((__u16 *) (opcode+2)), location+1);
+                                signal = math_emu_srnm(opcode, regs);
+                        } else if (opcode[1] == 0x9c) {
+                                get_user(*((__u16 *) (opcode+2)), location+1);
+                                signal = math_emu_stfpc(opcode, regs);
+                        } else if (opcode[1] == 0x9d) {
+                                get_user(*((__u16 *) (opcode+2)), location+1);
+                                signal = math_emu_lfpc(opcode, regs);
+                        } else
+                                signal = SIGILL;
+                        break;
+                default:
+                        signal = SIGILL;
+                        break;
+                }
+        }
+#endif 
+        if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
+                signal = SIGFPE;
+        else
+                signal = SIGILL;
+        if (signal == SIGFPE)
+                do_fp_trap(regs, location,
+                           current->thread.fp_regs.fpc, interruption_code);
+        else if (signal) {
+                siginfo_t info;
+                info.si_signo = signal;
+                info.si_errno = 0;
+                info.si_code = ILL_ILLOPN;
+                info.si_addr = location;
+                do_trap(interruption_code, signal, 
+                        "data exception", regs, &info);
+        }
+}
+
+asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code)
+{
+        siginfo_t info;
+
+        /* Set user psw back to home space mode. */
+        if (regs->psw.mask & PSW_MASK_PSTATE)
+                regs->psw.mask |= PSW_ASC_HOME;
+        /* Send SIGILL. */
+        info.si_signo = SIGILL;
+        info.si_errno = 0;
+        info.si_code = ILL_PRVOPC;
+        info.si_addr = get_check_address(regs);
+        do_trap(int_code, SIGILL, "space switch event", regs, &info);
+}
+
+asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
+{
+        die("Kernel stack overflow", regs, 0);
+        panic("Corrupt kernel stack, can't continue.");
+}
+
+
+/* init is done in lowcore.S and head.S */
+
+void __init trap_init(void)
+{
+        int i;
+
+        for (i = 0; i < 128; i++)
+          pgm_check_table[i] = &default_trap_handler;
+        pgm_check_table[1] = &illegal_op;
+        pgm_check_table[2] = &privileged_op;
+        pgm_check_table[3] = &execute_exception;
+        pgm_check_table[4] = &do_protection_exception;
+        pgm_check_table[5] = &addressing_exception;
+        pgm_check_table[6] = &specification_exception;
+        pgm_check_table[7] = &data_exception;
+        pgm_check_table[8] = &overflow_exception;
+        pgm_check_table[9] = &divide_exception;
+        pgm_check_table[0x0A] = &overflow_exception;
+        pgm_check_table[0x0B] = &divide_exception;
+        pgm_check_table[0x0C] = &hfp_overflow_exception;
+        pgm_check_table[0x0D] = &hfp_underflow_exception;
+        pgm_check_table[0x0E] = &hfp_significance_exception;
+        pgm_check_table[0x0F] = &hfp_divide_exception;
+        pgm_check_table[0x10] = &do_dat_exception;
+        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 */
+        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 */
+        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) {
+                /*
+                 * First try to get pfault pseudo page faults going.
+                 * If this isn't available turn on pagex page faults.
+                 */
+#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");
+
+                if (pfault_init() == 0) 
+                        return;
+                
+                /* Tough luck, no pfault. */
+                unregister_early_external_interrupt(0x2603, pfault_interrupt,
+                                                    &ext_int_pfault);
+#endif
+#ifndef CONFIG_ARCH_S390X
+                cpcmd("SET PAGEX ON", NULL, 0);
+#endif
+        }
+}