/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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_segment_exception; extern pgm_check_handler_t do_region_exception; extern pgm_check_handler_t do_page_exception; extern pgm_check_handler_t do_pseudo_page_fault; #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 #if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_VIRT_TIMER) extern pgm_check_handler_t do_monitor_call; #endif #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; }) #ifndef CONFIG_ARCH_S390X #define RET_ADDR 56 #define FOURLONG "%08lx %08lx %08lx %08lx\n" static int kstack_depth_to_print = 12; #else /* CONFIG_ARCH_S390X */ #define RET_ADDR 112 #define FOURLONG "%016lx %016lx %016lx %016lx\n" static int kstack_depth_to_print = 20; #endif /* CONFIG_ARCH_S390X */ void show_trace(struct task_struct *task, unsigned long * stack) { unsigned long backchain, low_addr, high_addr, ret_addr; if (!stack) stack = (task == NULL) ? *stack_pointer : &(task->thread.ksp); printk("Call Trace:\n"); low_addr = ((unsigned long) stack) & PSW_ADDR_INSN; high_addr = (low_addr & (-THREAD_SIZE)) + THREAD_SIZE; /* Skip the first frame (biased stack) */ backchain = *((unsigned long *) low_addr) & PSW_ADDR_INSN; /* Print up to 8 lines */ while (backchain > low_addr && backchain <= high_addr) { ret_addr = *((unsigned long *) (backchain+RET_ADDR)) & PSW_ADDR_INSN; printk(" [<%016lx>] ", ret_addr); print_symbol("%s\n", ret_addr); low_addr = backchain; backchain = *((unsigned long *) backchain) & PSW_ADDR_INSN; } printk("\n"); } void show_stack(struct task_struct *task, unsigned long *sp) { unsigned long *stack; int i; // debugging aid: "show_stack(NULL);" prints the // back trace for this cpu. if (!sp) { if (task) sp = (unsigned long *) task->thread.ksp; else sp = *stack_pointer; } 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 *)(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; } spinlock_t die_lock = SPIN_LOCK_UNLOCKED; void die(const char * str, struct pt_regs * regs, long err) { static int die_counter; 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 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; if (info) force_sig_info(signr, info, tsk); else force_sig(signr, tsk); #ifndef CONFIG_SYSCTL #ifdef CONFIG_PROCESS_DEBUG printk("User process fault: interruption code 0x%lX\n", interruption_code); show_regs(regs); #endif #else if (sysctl_userprocess_debug) { printk("User process fault: interruption code 0x%lX\n", interruption_code); show_regs(regs); } #endif } 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); } int do_debugger_trap(struct pt_regs *regs) { if ((regs->psw.mask & PSW_MASK_PSTATE) && (current->ptrace & PT_PTRACED)) { force_sig(SIGTRAP,current); return 0; } return 1; } #define DO_ERROR(signr, str, name) \ asmlinkage void name(struct pt_regs * regs, long interruption_code) \ { \ do_trap(interruption_code, signr, str, regs, NULL); \ } #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(SIGSEGV, "Unknown program exception", default_trap_handler) DO_ERROR_INFO(SIGBUS, "addressing exception", addressing_exception, BUS_ADRERR, 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(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) { __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), location); else *((__u16 *)opcode)=*((__u16 *)location); if (*((__u16 *)opcode)==S390_BREAKPOINT_U16) { if(do_debugger_trap(regs)) signal = SIGILL; } #ifdef CONFIG_MATHEMU else if (regs->psw.mask & PSW_MASK_PSTATE) { 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); } else signal = SIGILL; } #endif else signal = SIGILL; if (signal == SIGFPE) do_fp_trap(regs, location, current->thread.fp_regs.fpc, interruption_code); else if (signal) do_trap(interruption_code, signal, "illegal operation", regs, NULL); } #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); } } /* 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[9] = ÷_exception; pgm_check_table[0x10] = &do_segment_exception; pgm_check_table[0x11] = &do_page_exception; pgm_check_table[0x12] = &translation_exception; pgm_check_table[0x13] = &special_op_exception; #ifndef CONFIG_ARCH_S390X pgm_check_table[0x14] = &do_pseudo_page_fault; #else /* CONFIG_ARCH_S390X */ pgm_check_table[0x38] = &addressing_exception; pgm_check_table[0x3B] = &do_region_exception; #endif /* CONFIG_ARCH_S390X */ pgm_check_table[0x15] = &operand_exception; pgm_check_table[0x1C] = &privileged_op; #if defined(CONFIG_VIRT_TIMER) || defined(CONFIG_NO_IDLE_HZ) pgm_check_table[0x40] = &do_monitor_call; #endif if (MACHINE_IS_VM) { /* * First try to get pfault pseudo page faults going. * If this isn't available turn on pagex page faults. */ #ifdef CONFIG_PFAULT /* request the 0x2603 external interrupt */ 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 #ifndef CONFIG_ARCH_S390X cpcmd("SET PAGEX ON", NULL, 0); #endif } }