| /* |
| * 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_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"); |
| } |
| |
| 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) |
| { |
| 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 = task_pt_regs(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 __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 *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] = ÷_exception; |
| pgm_check_table[0x0A] = &overflow_exception; |
| pgm_check_table[0x0B] = ÷_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_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_64BIT */ |
| 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 |
| } |
| } |