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-rw-r--r--arch/s390/kernel/traps.c690
1 files changed, 174 insertions, 516 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index c5bd36fae56..c5762324d9e 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -1,8 +1,6 @@
/*
- * arch/s390/kernel/traps.c
- *
* S390 version
- * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright IBM Corp. 1999, 2000
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
*
@@ -14,503 +12,245 @@
* '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/kprobes.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
#include <linux/ptrace.h>
-#include <linux/timer.h>
+#include <linux/sched.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;
+#include "entry.h"
-#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
+int show_unhandled_signals = 1;
-#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)
+static inline void __user *get_trap_ip(struct pt_regs *regs)
{
- 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];
- }
-}
+#ifdef CONFIG_64BIT
+ unsigned long address;
-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);
+ if (regs->int_code & 0x200)
+ address = *(unsigned long *)(current->thread.trap_tdb + 24);
else
- __show_trace(sp, S390_lowcore.thread_info,
- S390_lowcore.thread_info + THREAD_SIZE);
- printk("\n");
+ 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
}
-void show_stack(struct task_struct *task, unsigned long *sp)
+static inline void report_user_fault(struct pt_regs *regs, int signr)
{
- 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++);
- }
+ 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_trace(task, sp);
+ show_regs(regs);
}
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
+int is_valid_bugaddr(unsigned long addr)
{
- show_stack(0, 0);
+ return 1;
}
-EXPORT_SYMBOL(dump_stack);
-
-void show_registers(struct pt_regs *regs)
+static void __kprobes do_trap(struct pt_regs *regs,
+ int si_signo, int si_code, char *str)
{
- 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);
-}
+ siginfo_t info;
-static void inline
-report_user_fault(long interruption_code, struct pt_regs *regs)
-{
-#if defined(CONFIG_SYSCTL)
- if (!sysctl_userprocess_debug)
+ if (notify_die(DIE_TRAP, str, regs, 0,
+ regs->int_code, si_signo) == NOTIFY_STOP)
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);
+ 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 = fixup->fixup | PSW_ADDR_AMODE;
- else
- die(str, regs, interruption_code);
+ 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);
+ }
}
}
-static inline void *get_check_address(struct pt_regs *regs)
+void __kprobes do_per_trap(struct pt_regs *regs)
{
- return (void *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
-}
+ siginfo_t info;
-void do_single_step(struct pt_regs *regs)
-{
- if ((current->ptrace & PT_PTRACED) != 0)
- force_sig(SIGTRAP, current);
+ 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);
}
-asmlinkage void
-default_trap_handler(struct pt_regs * regs, long interruption_code)
+void default_trap_handler(struct pt_regs *regs)
{
- if (regs->psw.mask & PSW_MASK_PSTATE) {
- local_irq_enable();
+ if (user_mode(regs)) {
+ report_user_fault(regs, SIGSEGV);
do_exit(SIGSEGV);
- report_user_fault(interruption_code, regs);
} else
- die("Unknown program exception", regs, interruption_code);
+ die(regs, "Unknown program exception");
}
-#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); \
+#define DO_ERROR_INFO(name, signr, sicode, str) \
+void name(struct pt_regs *regs) \
+{ \
+ do_trap(regs, signr, sicode, str); \
}
-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;
+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
- si.si_signo = SIGFPE;
- si.si_errno = 0;
- si.si_addr = location;
- si.si_code = 0;
+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.si_code = FPE_FLTINV;
+ si_code = FPE_FLTINV;
else if (fpc & 0x4000) /* div by 0 */
- si.si_code = FPE_FLTDIV;
+ si_code = FPE_FLTDIV;
else if (fpc & 0x2000) /* overflow */
- si.si_code = FPE_FLTOVF;
+ si_code = FPE_FLTOVF;
else if (fpc & 0x1000) /* underflow */
- si.si_code = FPE_FLTUND;
+ si_code = FPE_FLTUND;
else if (fpc & 0x0800) /* inexact */
- si.si_code = FPE_FLTRES;
+ si_code = FPE_FLTRES;
}
- current->thread.ieee_instruction_pointer = (addr_t) location;
- do_trap(interruption_code, SIGFPE,
- "floating point exception", regs, &si);
+ do_trap(regs, SIGFPE, si_code, "floating point exception");
}
-asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
+void __kprobes illegal_op(struct pt_regs *regs)
{
siginfo_t info;
__u8 opcode[6];
- __u16 *location;
+ __u16 __user *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();
+ location = get_trap_ip(regs);
- if (regs->psw.mask & PSW_MASK_PSTATE) {
- get_user(*((__u16 *) opcode), (__u16 __user *) location);
+ if (user_mode(regs)) {
+ 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
+ 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) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_b3(opcode, regs);
} else if (opcode[0] == 0xed) {
- get_user(*((__u32 *) (opcode+2)),
- (__u32 *)(location+1));
+ if (get_user(*((__u32 *) (opcode+2)),
+ (__u32 __user *)(location+1)))
+ return;
signal = math_emu_ed(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb299) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_srnm(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb29c) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_stfpc(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb29d) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_lfpc(opcode, regs);
#endif
} else
signal = SIGILL;
- } 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, 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
+ 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) {
- 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);
- }
+ if (signal)
+ do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
}
#ifdef CONFIG_MATHEMU
-asmlinkage void
-specification_exception(struct pt_regs * regs, long interruption_code)
+void specification_exception(struct pt_regs *regs)
{
__u8 opcode[6];
- __u16 *location = NULL;
+ __u16 __user *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();
+ location = (__u16 __user *) get_trap_ip(regs);
- if (regs->psw.mask & PSW_MASK_PSTATE) {
+ if (user_mode(regs)) {
get_user(*((__u16 *) opcode), location);
switch (opcode[0]) {
case 0x28: /* LDR Rx,Ry */
@@ -543,43 +283,27 @@ specification_exception(struct pt_regs * regs, long interruption_code)
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);
- }
+ do_fp_trap(regs, current->thread.fp_regs.fpc);
+ else if (signal)
+ do_trap(regs, signal, ILL_ILLOPN, "specification exception");
}
#else
-DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
- ILL_ILLOPN, get_check_address(regs));
+DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
+ "specification exception");
#endif
-asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
+void data_exception(struct pt_regs *regs)
{
- __u16 *location;
+ __u16 __user *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();
+ location = get_trap_ip(regs);
if (MACHINE_HAS_IEEE)
- __asm__ volatile ("stfpc %0\n\t"
- : "=m" (current->thread.fp_regs.fpc));
+ asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
#ifdef CONFIG_MATHEMU
- else if (regs->psw.mask & PSW_MASK_PSTATE) {
+ else if (user_mode(regs)) {
__u8 opcode[6];
get_user(*((__u16 *) opcode), location);
switch (opcode[0]) {
@@ -611,7 +335,7 @@ asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
break;
case 0xed:
get_user(*((__u32 *) (opcode+2)),
- (__u32 *)(location+1));
+ (__u32 __user *)(location+1));
signal = math_emu_ed(opcode, regs);
break;
case 0xb2:
@@ -638,35 +362,21 @@ asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
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);
- }
+ do_fp_trap(regs, current->thread.fp_regs.fpc);
+ else if (signal)
+ do_trap(regs, signal, ILL_ILLOPN, "data exception");
}
-asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code)
+void space_switch_exception(struct pt_regs *regs)
{
- siginfo_t info;
-
/* Set user psw back to home space mode. */
- if (regs->psw.mask & PSW_MASK_PSTATE)
+ if (user_mode(regs))
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);
+ do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
}
-asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
+void __kprobes kernel_stack_overflow(struct pt_regs * regs)
{
bust_spinlocks(1);
printk("Kernel stack overflow.\n");
@@ -675,59 +385,7 @@ asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
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
- }
+ local_mcck_enable();
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 19:37:07 +0000