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-rw-r--r--arch/s390/kernel/traps.c738
1 files changed, 738 insertions, 0 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
new file mode 100644
index 00000000000..8b90e9528b9
--- /dev/null
+++ b/arch/s390/kernel/traps.c
@@ -0,0 +1,738 @@
+/*
+ * 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 <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;
+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
+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)
+{
+ die("Kernel stack overflow", regs, 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;
+#ifndef CONFIG_ARCH_S390X
+ pgm_check_table[0x14] = &do_pseudo_page_fault;
+#else /* 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) {
+ /*
+ * 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
+ }
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-08 18:38:40 +0000