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android_kernel_xiaomi_sm7250/arch/s390/kernel/traps.c
Martin Schwidefsky d4b6899678 [PATCH] s390: remove pagex support 
Remove pagex pseudo page fault code.  It does not work together with the
system call speedup that makes the complete system call path enabled for
interrupts.  To make pagex and the syscall speedup code work together we would
have to add code to the program check handler to do a critical section cleanup
like the asynchronous interrupt code.  This would make program checks slower.
Not what we want.

Newer versions of z/VM have the improved pfault pseudo page fault interface.
This replaces the old pagex interface and does not have the problem.  So its
better to just rip out the pagex code.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:33 -08:00

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/*
* 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 <linux/reboot.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;
#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)
{
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_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) {
#ifdef CONFIG_PFAULT
/*
* Try to get pfault pseudo page faults going.
*/
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
}
}
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