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a806170e29
linux_dsm_epyc7002/arch/s390/kernel/traps.c
Heiko Carstens a806170e29 [S390] Fix a lot of sparse warnings. 
Most noteable part of this commit is the new local header file entry.h
which contains all the function declarations of functions that get only
called from asm code or are arch internal. That way we can avoid extern
declarations in C files.
This is more or less the same that was done for sparc64.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-04-17 07:47:06 +02:00

740 lines
22 KiB
C
Raw Blame History

/*
* 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/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/init.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kdebug.h>
#include <linux/kallsyms.h>
#include <linux/reboot.h>
#include <linux/kprobes.h>
#include <linux/bug.h>
#include <linux/utsname.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>
#include "entry.h"
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_asce_exception;
#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
#ifndef CONFIG_64BIT
#define FOURLONG "%08lx %08lx %08lx %08lx\n"
static int kstack_depth_to_print = 12;
#else /* CONFIG_64BIT */
#define FOURLONG "%016lx %016lx %016lx %016lx\n"
static int kstack_depth_to_print = 20;
#endif /* CONFIG_64BIT */
/*
* 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_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);
printk("\n");
if (!task)
task = current;
debug_show_held_locks(task);
}
void show_stack(struct task_struct *task, unsigned long *sp)
{
register unsigned long * __r15 asm ("15");
unsigned long *stack;
int i;
if (!sp)
stack = task ? (unsigned long *) task->thread.ksp : __r15;
else
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)
{
printk("CPU: %d %s %s %.*s\n",
task_thread_info(current)->cpu, print_tainted(),
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
current->comm, current->pid, current,
(void *) current->thread.ksp);
show_stack(NULL, NULL);
}
EXPORT_SYMBOL(dump_stack);
static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
{
return (regs->psw.mask & bits) / ((~bits + 1) & bits);
}
void show_registers(struct pt_regs *regs)
{
char *mode;
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(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
"P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
#ifdef CONFIG_64BIT
printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS));
#endif
printk("\n%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]);
show_code(regs);
}
/* This is called from fs/proc/array.c */
void task_show_regs(struct seq_file *m, struct task_struct *task)
{
struct pt_regs *regs;
regs = task_pt_regs(task);
seq_printf(m, "task: %p, ksp: %p\n",
task, (void *)task->thread.ksp);
seq_printf(m, "User PSW : %p %p\n",
(void *) regs->psw.mask, (void *)regs->psw.addr);
seq_printf(m, "User GPRS: " FOURLONG,
regs->gprs[0], regs->gprs[1],
regs->gprs[2], regs->gprs[3]);
seq_printf(m, " " FOURLONG,
regs->gprs[4], regs->gprs[5],
regs->gprs[6], regs->gprs[7]);
seq_printf(m, " " FOURLONG,
regs->gprs[8], regs->gprs[9],
regs->gprs[10], regs->gprs[11]);
seq_printf(m, " " FOURLONG,
regs->gprs[12], regs->gprs[13],
regs->gprs[14], regs->gprs[15]);
seq_printf(m, "User ACRS: %08x %08x %08x %08x\n",
task->thread.acrs[0], task->thread.acrs[1],
task->thread.acrs[2], task->thread.acrs[3]);
seq_printf(m, " %08x %08x %08x %08x\n",
task->thread.acrs[4], task->thread.acrs[5],
task->thread.acrs[6], task->thread.acrs[7]);
seq_printf(m, " %08x %08x %08x %08x\n",
task->thread.acrs[8], task->thread.acrs[9],
task->thread.acrs[10], task->thread.acrs[11]);
seq_printf(m, " %08x %08x %08x %08x\n",
task->thread.acrs[12], task->thread.acrs[13],
task->thread.acrs[14], task->thread.acrs[15]);
}
static DEFINE_SPINLOCK(die_lock);
void die(const char * str, struct pt_regs * regs, long err)
{
static int die_counter;
oops_enter();
debug_stop_all();
console_verbose();
spin_lock_irq(&die_lock);
bust_spinlocks(1);
printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
printk("SMP ");
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
show_regs(regs);
bust_spinlocks(0);
add_taint(TAINT_DIE);
spin_unlock_irq(&die_lock);
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception: panic_on_oops");
oops_exit();
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
}
int is_valid_bugaddr(unsigned long addr)
{
return 1;
}
static void __kprobes 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 (notify_die(DIE_TRAP, str, regs, interruption_code,
interruption_code, signr) == NOTIFY_STOP)
return;
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 {
enum bug_trap_type btt;
btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
if (btt == BUG_TRAP_TYPE_WARN)
return;
die(str, regs, interruption_code);
}
}
}
static inline void __user *get_check_address(struct pt_regs *regs)
{
return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
}
void __kprobes do_single_step(struct pt_regs *regs)
{
if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
SIGTRAP) == NOTIFY_STOP){
return;
}
if ((current->ptrace & PT_PTRACED) != 0)
force_sig(SIGTRAP, current);
}
static 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) \
static 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 = 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 __user *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);
}
static void illegal_op(struct pt_regs * regs, long interruption_code)
{
siginfo_t info;
__u8 opcode[6];
__u16 __user *location;
int signal = 0;
location = 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) {
if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
return;
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) {
if (get_user(*((__u16 *) (opcode+2)), location+1))
return;
signal = math_emu_b3(opcode, regs);
} else if (opcode[0] == 0xed) {
if (get_user(*((__u32 *) (opcode+2)),
(__u32 __user *)(location+1)))
return;
signal = math_emu_ed(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb299) {
if (get_user(*((__u16 *) (opcode+2)), location+1))
return;
signal = math_emu_srnm(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb29c) {
if (get_user(*((__u16 *) (opcode+2)), location+1))
return;
signal = math_emu_stfpc(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb29d) {
if (get_user(*((__u16 *) (opcode+2)), location+1))
return;
signal = math_emu_lfpc(opcode, regs);
#endif
} else
signal = SIGILL;
} else {
/*
* If we get an illegal op in kernel mode, send it through the
* kprobes notifier. If kprobes doesn't pick it up, SIGILL
*/
if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
3, SIGTRAP) != NOTIFY_STOP)
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 __user *) 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 __user *) 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 __user *location = NULL;
int signal = 0;
location = (__u16 __user *) 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
static void data_exception(struct pt_regs * regs, long interruption_code)
{
__u16 __user *location;
int signal = 0;
location = 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" : "=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 __user *)(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);
}
}
static 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)
{
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)
{
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;
#ifdef CONFIG_64BIT
pgm_check_table[0x38] = &do_asce_exception;
pgm_check_table[0x39] = &do_dat_exception;
pgm_check_table[0x3A] = &do_dat_exception;
pgm_check_table[0x3B] = &do_dat_exception;
#endif /* CONFIG_64BIT */
pgm_check_table[0x15] = &operand_exception;
pgm_check_table[0x1C] = &space_switch_exception;
pgm_check_table[0x1D] = &hfp_sqrt_exception;
pfault_irq_init();
}
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