mirror of https://gitee.com/openkylin/linux.git
392 lines
10 KiB
C
392 lines
10 KiB
C
/*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999, 2000
|
|
* 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/kprobes.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include "entry.h"
|
|
|
|
int show_unhandled_signals = 1;
|
|
|
|
static inline void __user *get_trap_ip(struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_64BIT
|
|
unsigned long address;
|
|
|
|
if (regs->int_code & 0x200)
|
|
address = *(unsigned long *)(current->thread.trap_tdb + 24);
|
|
else
|
|
address = regs->psw.addr;
|
|
return (void __user *)
|
|
((address - (regs->int_code >> 16)) & PSW_ADDR_INSN);
|
|
#else
|
|
return (void __user *)
|
|
((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
|
|
#endif
|
|
}
|
|
|
|
static inline void report_user_fault(struct pt_regs *regs, int signr)
|
|
{
|
|
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
|
|
return;
|
|
if (!unhandled_signal(current, signr))
|
|
return;
|
|
if (!printk_ratelimit())
|
|
return;
|
|
printk("User process fault: interruption code 0x%X ", regs->int_code);
|
|
print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN);
|
|
printk("\n");
|
|
show_regs(regs);
|
|
}
|
|
|
|
int is_valid_bugaddr(unsigned long addr)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void __kprobes do_trap(struct pt_regs *regs,
|
|
int si_signo, int si_code, char *str)
|
|
{
|
|
siginfo_t info;
|
|
|
|
if (notify_die(DIE_TRAP, str, regs, 0,
|
|
regs->int_code, si_signo) == NOTIFY_STOP)
|
|
return;
|
|
|
|
if (user_mode(regs)) {
|
|
info.si_signo = si_signo;
|
|
info.si_errno = 0;
|
|
info.si_code = si_code;
|
|
info.si_addr = get_trap_ip(regs);
|
|
force_sig_info(si_signo, &info, current);
|
|
report_user_fault(regs, si_signo);
|
|
} else {
|
|
const struct exception_table_entry *fixup;
|
|
fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
|
|
if (fixup)
|
|
regs->psw.addr = extable_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(regs, str);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __kprobes do_per_trap(struct pt_regs *regs)
|
|
{
|
|
siginfo_t info;
|
|
|
|
if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
|
|
return;
|
|
if (!current->ptrace)
|
|
return;
|
|
info.si_signo = SIGTRAP;
|
|
info.si_errno = 0;
|
|
info.si_code = TRAP_HWBKPT;
|
|
info.si_addr =
|
|
(void __force __user *) current->thread.per_event.address;
|
|
force_sig_info(SIGTRAP, &info, current);
|
|
}
|
|
|
|
void default_trap_handler(struct pt_regs *regs)
|
|
{
|
|
if (user_mode(regs)) {
|
|
report_user_fault(regs, SIGSEGV);
|
|
do_exit(SIGSEGV);
|
|
} else
|
|
die(regs, "Unknown program exception");
|
|
}
|
|
|
|
#define DO_ERROR_INFO(name, signr, sicode, str) \
|
|
void name(struct pt_regs *regs) \
|
|
{ \
|
|
do_trap(regs, signr, sicode, str); \
|
|
}
|
|
|
|
DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR,
|
|
"addressing exception")
|
|
DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN,
|
|
"execute exception")
|
|
DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV,
|
|
"fixpoint divide exception")
|
|
DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF,
|
|
"fixpoint overflow exception")
|
|
DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF,
|
|
"HFP overflow exception")
|
|
DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND,
|
|
"HFP underflow exception")
|
|
DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES,
|
|
"HFP significance exception")
|
|
DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV,
|
|
"HFP divide exception")
|
|
DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV,
|
|
"HFP square root exception")
|
|
DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN,
|
|
"operand exception")
|
|
DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC,
|
|
"privileged operation")
|
|
DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
|
|
"special operation exception")
|
|
DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
|
|
"translation exception")
|
|
|
|
#ifdef CONFIG_64BIT
|
|
DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
|
|
"transaction constraint exception")
|
|
#endif
|
|
|
|
static inline void do_fp_trap(struct pt_regs *regs, int fpc)
|
|
{
|
|
int 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_code = FPE_FLTINV;
|
|
else if (fpc & 0x4000) /* div by 0 */
|
|
si_code = FPE_FLTDIV;
|
|
else if (fpc & 0x2000) /* overflow */
|
|
si_code = FPE_FLTOVF;
|
|
else if (fpc & 0x1000) /* underflow */
|
|
si_code = FPE_FLTUND;
|
|
else if (fpc & 0x0800) /* inexact */
|
|
si_code = FPE_FLTRES;
|
|
}
|
|
do_trap(regs, SIGFPE, si_code, "floating point exception");
|
|
}
|
|
|
|
void __kprobes illegal_op(struct pt_regs *regs)
|
|
{
|
|
siginfo_t info;
|
|
__u8 opcode[6];
|
|
__u16 __user *location;
|
|
int signal = 0;
|
|
|
|
location = get_trap_ip(regs);
|
|
|
|
if (user_mode(regs)) {
|
|
if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
|
|
return;
|
|
if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
|
|
if (current->ptrace) {
|
|
info.si_signo = SIGTRAP;
|
|
info.si_errno = 0;
|
|
info.si_code = TRAP_BRKPT;
|
|
info.si_addr = location;
|
|
force_sig_info(SIGTRAP, &info, 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, 0,
|
|
3, SIGTRAP) != NOTIFY_STOP)
|
|
signal = SIGILL;
|
|
}
|
|
|
|
#ifdef CONFIG_MATHEMU
|
|
if (signal == SIGFPE)
|
|
do_fp_trap(regs, current->thread.fp_regs.fpc);
|
|
else if (signal == SIGSEGV)
|
|
do_trap(regs, signal, SEGV_MAPERR, "user address fault");
|
|
else
|
|
#endif
|
|
if (signal)
|
|
do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_MATHEMU
|
|
void specification_exception(struct pt_regs *regs)
|
|
{
|
|
__u8 opcode[6];
|
|
__u16 __user *location = NULL;
|
|
int signal = 0;
|
|
|
|
location = (__u16 __user *) get_trap_ip(regs);
|
|
|
|
if (user_mode(regs)) {
|
|
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, current->thread.fp_regs.fpc);
|
|
else if (signal)
|
|
do_trap(regs, signal, ILL_ILLOPN, "specification exception");
|
|
}
|
|
#else
|
|
DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
|
|
"specification exception");
|
|
#endif
|
|
|
|
void data_exception(struct pt_regs *regs)
|
|
{
|
|
__u16 __user *location;
|
|
int signal = 0;
|
|
|
|
location = get_trap_ip(regs);
|
|
|
|
if (MACHINE_HAS_IEEE)
|
|
asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
|
|
|
|
#ifdef CONFIG_MATHEMU
|
|
else if (user_mode(regs)) {
|
|
__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, current->thread.fp_regs.fpc);
|
|
else if (signal)
|
|
do_trap(regs, signal, ILL_ILLOPN, "data exception");
|
|
}
|
|
|
|
void space_switch_exception(struct pt_regs *regs)
|
|
{
|
|
/* Set user psw back to home space mode. */
|
|
if (user_mode(regs))
|
|
regs->psw.mask |= PSW_ASC_HOME;
|
|
/* Send SIGILL. */
|
|
do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
|
|
}
|
|
|
|
void __kprobes 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.");
|
|
}
|
|
|
|
void __init trap_init(void)
|
|
{
|
|
local_mcck_enable();
|
|
}
|