![Rusty Russell](/assets/img/avatar_default.png)
Fix up all callers as they were before, with make one change: an unsigned module taints the kernel, but doesn't turn off lockdep. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
634 lines
17 KiB
C
634 lines
17 KiB
C
/*
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* S390 version
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* Copyright IBM Corp. 1999, 2000
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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*
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* Derived from "arch/i386/kernel/traps.c"
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* 'Traps.c' handles hardware traps and faults after we have saved some
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* state in 'asm.s'.
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/seq_file.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/kdebug.h>
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#include <linux/kallsyms.h>
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#include <linux/reboot.h>
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#include <linux/kprobes.h>
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#include <linux/bug.h>
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#include <linux/utsname.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/atomic.h>
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#include <asm/mathemu.h>
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#include <asm/cpcmd.h>
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#include <asm/lowcore.h>
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#include <asm/debug.h>
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#include <asm/ipl.h>
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#include "entry.h"
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int show_unhandled_signals = 1;
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#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
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#ifndef CONFIG_64BIT
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#define LONG "%08lx "
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#define FOURLONG "%08lx %08lx %08lx %08lx\n"
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static int kstack_depth_to_print = 12;
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#else /* CONFIG_64BIT */
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#define LONG "%016lx "
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#define FOURLONG "%016lx %016lx %016lx %016lx\n"
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static int kstack_depth_to_print = 20;
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#endif /* CONFIG_64BIT */
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static inline void __user *get_trap_ip(struct pt_regs *regs)
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{
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#ifdef CONFIG_64BIT
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unsigned long address;
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if (regs->int_code & 0x200)
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address = *(unsigned long *)(current->thread.trap_tdb + 24);
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else
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address = regs->psw.addr;
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return (void __user *)
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((address - (regs->int_code >> 16)) & PSW_ADDR_INSN);
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#else
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return (void __user *)
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((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
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#endif
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}
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/*
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* For show_trace we have tree different stack to consider:
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* - the panic stack which is used if the kernel stack has overflown
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* - the asynchronous interrupt stack (cpu related)
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* - the synchronous kernel stack (process related)
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* The stack trace can start at any of the three stack and can potentially
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* touch all of them. The order is: panic stack, async stack, sync stack.
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*/
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static unsigned long
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__show_trace(unsigned long sp, unsigned long low, unsigned long high)
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{
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struct stack_frame *sf;
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struct pt_regs *regs;
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while (1) {
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sp = sp & PSW_ADDR_INSN;
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if (sp < low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
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print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
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/* Follow the backchain. */
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while (1) {
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low = sp;
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sp = sf->back_chain & PSW_ADDR_INSN;
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if (!sp)
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break;
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if (sp <= low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
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print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
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}
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/* Zero backchain detected, check for interrupt frame. */
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sp = (unsigned long) (sf + 1);
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if (sp <= low || sp > high - sizeof(*regs))
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return sp;
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regs = (struct pt_regs *) sp;
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printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
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print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
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low = sp;
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sp = regs->gprs[15];
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}
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}
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static void show_trace(struct task_struct *task, unsigned long *stack)
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{
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register unsigned long __r15 asm ("15");
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unsigned long sp;
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sp = (unsigned long) stack;
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if (!sp)
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sp = task ? task->thread.ksp : __r15;
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printk("Call Trace:\n");
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#ifdef CONFIG_CHECK_STACK
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sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
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S390_lowcore.panic_stack);
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#endif
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sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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if (task)
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__show_trace(sp, (unsigned long) task_stack_page(task),
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(unsigned long) task_stack_page(task) + THREAD_SIZE);
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else
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__show_trace(sp, S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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if (!task)
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task = current;
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debug_show_held_locks(task);
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}
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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register unsigned long * __r15 asm ("15");
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unsigned long *stack;
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int i;
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if (!sp)
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stack = task ? (unsigned long *) task->thread.ksp : __r15;
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else
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stack = sp;
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
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break;
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if ((i * sizeof(long) % 32) == 0)
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printk("%s ", i == 0 ? "" : "\n");
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printk(LONG, *stack++);
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}
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printk("\n");
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show_trace(task, sp);
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}
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static void show_last_breaking_event(struct pt_regs *regs)
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{
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#ifdef CONFIG_64BIT
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printk("Last Breaking-Event-Address:\n");
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printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
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print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
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#endif
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}
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/*
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* The architecture-independent dump_stack generator
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*/
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void dump_stack(void)
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{
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printk("CPU: %d %s %s %.*s\n",
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task_thread_info(current)->cpu, print_tainted(),
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init_utsname()->release,
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
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current->comm, current->pid, current,
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(void *) current->thread.ksp);
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show_stack(NULL, NULL);
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}
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EXPORT_SYMBOL(dump_stack);
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static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
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{
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return (regs->psw.mask & bits) / ((~bits + 1) & bits);
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}
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void show_registers(struct pt_regs *regs)
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{
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char *mode;
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mode = user_mode(regs) ? "User" : "Krnl";
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printk("%s PSW : %p %p",
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mode, (void *) regs->psw.mask,
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(void *) regs->psw.addr);
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print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
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printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
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"P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
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mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
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mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
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mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
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mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
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mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
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#ifdef CONFIG_64BIT
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printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
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#endif
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printk("\n%s GPRS: " FOURLONG, mode,
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regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
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printk(" " FOURLONG,
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regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
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printk(" " FOURLONG,
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regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
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printk(" " FOURLONG,
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regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
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show_code(regs);
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}
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void show_regs(struct pt_regs *regs)
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{
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printk("CPU: %d %s %s %.*s\n",
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task_thread_info(current)->cpu, print_tainted(),
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init_utsname()->release,
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
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current->comm, current->pid, current,
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(void *) current->thread.ksp);
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show_registers(regs);
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/* Show stack backtrace if pt_regs is from kernel mode */
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if (!user_mode(regs))
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show_trace(NULL, (unsigned long *) regs->gprs[15]);
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show_last_breaking_event(regs);
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}
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static DEFINE_SPINLOCK(die_lock);
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void die(struct pt_regs *regs, const char *str)
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{
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static int die_counter;
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oops_enter();
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lgr_info_log();
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debug_stop_all();
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console_verbose();
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spin_lock_irq(&die_lock);
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bust_spinlocks(1);
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printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
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#ifdef CONFIG_PREEMPT
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printk("PREEMPT ");
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#endif
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#ifdef CONFIG_SMP
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printk("SMP ");
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#endif
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#ifdef CONFIG_DEBUG_PAGEALLOC
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printk("DEBUG_PAGEALLOC");
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#endif
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printk("\n");
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notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
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print_modules();
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show_regs(regs);
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bust_spinlocks(0);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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if (in_interrupt())
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panic("Fatal exception in interrupt");
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if (panic_on_oops)
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panic("Fatal exception: panic_on_oops");
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oops_exit();
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do_exit(SIGSEGV);
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}
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static inline void report_user_fault(struct pt_regs *regs, int signr)
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{
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if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
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return;
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if (!unhandled_signal(current, signr))
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return;
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if (!printk_ratelimit())
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return;
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printk("User process fault: interruption code 0x%X ", regs->int_code);
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print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN);
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printk("\n");
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show_regs(regs);
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}
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int is_valid_bugaddr(unsigned long addr)
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{
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return 1;
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}
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static void __kprobes do_trap(struct pt_regs *regs,
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int si_signo, int si_code, char *str)
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{
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siginfo_t info;
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if (notify_die(DIE_TRAP, str, regs, 0,
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regs->int_code, si_signo) == NOTIFY_STOP)
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return;
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if (user_mode(regs)) {
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info.si_signo = si_signo;
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info.si_errno = 0;
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info.si_code = si_code;
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info.si_addr = get_trap_ip(regs);
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force_sig_info(si_signo, &info, current);
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report_user_fault(regs, si_signo);
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} else {
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const struct exception_table_entry *fixup;
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fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
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if (fixup)
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regs->psw.addr = extable_fixup(fixup) | PSW_ADDR_AMODE;
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else {
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enum bug_trap_type btt;
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btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
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if (btt == BUG_TRAP_TYPE_WARN)
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return;
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die(regs, str);
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}
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}
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}
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void __kprobes do_per_trap(struct pt_regs *regs)
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{
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siginfo_t info;
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if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
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return;
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if (!current->ptrace)
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return;
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info.si_signo = SIGTRAP;
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info.si_errno = 0;
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info.si_code = TRAP_HWBKPT;
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info.si_addr =
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(void __force __user *) current->thread.per_event.address;
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force_sig_info(SIGTRAP, &info, current);
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}
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void default_trap_handler(struct pt_regs *regs)
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{
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if (user_mode(regs)) {
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report_user_fault(regs, SIGSEGV);
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do_exit(SIGSEGV);
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} else
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die(regs, "Unknown program exception");
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}
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#define DO_ERROR_INFO(name, signr, sicode, str) \
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void name(struct pt_regs *regs) \
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{ \
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do_trap(regs, signr, sicode, str); \
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}
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DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR,
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"addressing exception")
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DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN,
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"execute exception")
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DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV,
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"fixpoint divide exception")
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DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF,
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"fixpoint overflow exception")
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DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF,
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"HFP overflow exception")
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DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND,
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"HFP underflow exception")
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DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES,
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"HFP significance exception")
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DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV,
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"HFP divide exception")
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DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV,
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"HFP square root exception")
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DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN,
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"operand exception")
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DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC,
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"privileged operation")
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DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
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"special operation exception")
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DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
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"translation exception")
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#ifdef CONFIG_64BIT
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DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
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"transaction constraint exception")
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#endif
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static inline void do_fp_trap(struct pt_regs *regs, int fpc)
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{
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int si_code = 0;
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/* FPC[2] is Data Exception Code */
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if ((fpc & 0x00000300) == 0) {
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/* bits 6 and 7 of DXC are 0 iff IEEE exception */
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if (fpc & 0x8000) /* invalid fp operation */
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si_code = FPE_FLTINV;
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else if (fpc & 0x4000) /* div by 0 */
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si_code = FPE_FLTDIV;
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else if (fpc & 0x2000) /* overflow */
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si_code = FPE_FLTOVF;
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else if (fpc & 0x1000) /* underflow */
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si_code = FPE_FLTUND;
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else if (fpc & 0x0800) /* inexact */
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si_code = FPE_FLTRES;
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}
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do_trap(regs, SIGFPE, si_code, "floating point exception");
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}
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void __kprobes illegal_op(struct pt_regs *regs)
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{
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siginfo_t info;
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__u8 opcode[6];
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__u16 __user *location;
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int signal = 0;
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location = get_trap_ip(regs);
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if (user_mode(regs)) {
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if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
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return;
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if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
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if (current->ptrace) {
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info.si_signo = SIGTRAP;
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info.si_errno = 0;
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info.si_code = TRAP_BRKPT;
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info.si_addr = location;
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force_sig_info(SIGTRAP, &info, current);
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} else
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signal = SIGILL;
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#ifdef CONFIG_MATHEMU
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} else if (opcode[0] == 0xb3) {
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if (get_user(*((__u16 *) (opcode+2)), location+1))
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return;
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signal = math_emu_b3(opcode, regs);
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} else if (opcode[0] == 0xed) {
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if (get_user(*((__u32 *) (opcode+2)),
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(__u32 __user *)(location+1)))
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return;
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signal = math_emu_ed(opcode, regs);
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} else if (*((__u16 *) opcode) == 0xb299) {
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if (get_user(*((__u16 *) (opcode+2)), location+1))
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return;
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signal = math_emu_srnm(opcode, regs);
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} else if (*((__u16 *) opcode) == 0xb29c) {
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if (get_user(*((__u16 *) (opcode+2)), location+1))
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return;
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signal = math_emu_stfpc(opcode, regs);
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} else if (*((__u16 *) opcode) == 0xb29d) {
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if (get_user(*((__u16 *) (opcode+2)), location+1))
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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();
|
|
}
|