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Diffstat (limited to 'arch/ppc64/kernel/traps.c')
-rw-r--r--arch/ppc64/kernel/traps.c568
1 files changed, 0 insertions, 568 deletions
diff --git a/arch/ppc64/kernel/traps.c b/arch/ppc64/kernel/traps.c
deleted file mode 100644
index a728c9f0b53..00000000000
--- a/arch/ppc64/kernel/traps.c
+++ /dev/null
@@ -1,568 +0,0 @@
-/*
- * linux/arch/ppc64/kernel/traps.c
- *
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Modified by Cort Dougan (cort@cs.nmt.edu)
- * and Paul Mackerras (paulus@cs.anu.edu.au)
- */
-
-/*
- * This file handles the architecture-dependent parts of hardware exceptions
- */
-
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/slab.h>
-#include <linux/user.h>
-#include <linux/a.out.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/kprobes.h>
-#include <asm/kdebug.h>
-
-#include <asm/pgtable.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/ppcdebug.h>
-#include <asm/rtas.h>
-#include <asm/systemcfg.h>
-#include <asm/machdep.h>
-#include <asm/pmc.h>
-
-#ifdef CONFIG_DEBUGGER
-int (*__debugger)(struct pt_regs *regs);
-int (*__debugger_ipi)(struct pt_regs *regs);
-int (*__debugger_bpt)(struct pt_regs *regs);
-int (*__debugger_sstep)(struct pt_regs *regs);
-int (*__debugger_iabr_match)(struct pt_regs *regs);
-int (*__debugger_dabr_match)(struct pt_regs *regs);
-int (*__debugger_fault_handler)(struct pt_regs *regs);
-
-EXPORT_SYMBOL(__debugger);
-EXPORT_SYMBOL(__debugger_ipi);
-EXPORT_SYMBOL(__debugger_bpt);
-EXPORT_SYMBOL(__debugger_sstep);
-EXPORT_SYMBOL(__debugger_iabr_match);
-EXPORT_SYMBOL(__debugger_dabr_match);
-EXPORT_SYMBOL(__debugger_fault_handler);
-#endif
-
-struct notifier_block *powerpc_die_chain;
-static DEFINE_SPINLOCK(die_notifier_lock);
-
-int register_die_notifier(struct notifier_block *nb)
-{
- int err = 0;
- unsigned long flags;
-
- spin_lock_irqsave(&die_notifier_lock, flags);
- err = notifier_chain_register(&powerpc_die_chain, nb);
- spin_unlock_irqrestore(&die_notifier_lock, flags);
- return err;
-}
-
-/*
- * Trap & Exception support
- */
-
-static DEFINE_SPINLOCK(die_lock);
-
-int die(const char *str, struct pt_regs *regs, long err)
-{
- static int die_counter;
- int nl = 0;
-
- if (debugger(regs))
- return 1;
-
- console_verbose();
- spin_lock_irq(&die_lock);
- bust_spinlocks(1);
- printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
-#ifdef CONFIG_PREEMPT
- printk("PREEMPT ");
- nl = 1;
-#endif
-#ifdef CONFIG_SMP
- printk("SMP NR_CPUS=%d ", NR_CPUS);
- nl = 1;
-#endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
- printk("DEBUG_PAGEALLOC ");
- nl = 1;
-#endif
-#ifdef CONFIG_NUMA
- printk("NUMA ");
- nl = 1;
-#endif
- switch(systemcfg->platform) {
- case PLATFORM_PSERIES:
- printk("PSERIES ");
- nl = 1;
- break;
- case PLATFORM_PSERIES_LPAR:
- printk("PSERIES LPAR ");
- nl = 1;
- break;
- case PLATFORM_ISERIES_LPAR:
- printk("ISERIES LPAR ");
- nl = 1;
- break;
- case PLATFORM_POWERMAC:
- printk("POWERMAC ");
- nl = 1;
- break;
- case PLATFORM_BPA:
- printk("BPA ");
- nl = 1;
- break;
- }
- if (nl)
- printk("\n");
- print_modules();
- show_regs(regs);
- bust_spinlocks(0);
- spin_unlock_irq(&die_lock);
-
- if (in_interrupt())
- panic("Fatal exception in interrupt");
-
- if (panic_on_oops) {
- printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
- ssleep(5);
- panic("Fatal exception");
- }
- do_exit(SIGSEGV);
-
- return 0;
-}
-
-void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
-{
- siginfo_t info;
-
- if (!user_mode(regs)) {
- if (die("Exception in kernel mode", regs, signr))
- return;
- }
-
- memset(&info, 0, sizeof(info));
- info.si_signo = signr;
- info.si_code = code;
- info.si_addr = (void __user *) addr;
- force_sig_info(signr, &info, current);
-}
-
-void system_reset_exception(struct pt_regs *regs)
-{
- /* See if any machine dependent calls */
- if (ppc_md.system_reset_exception)
- ppc_md.system_reset_exception(regs);
-
- die("System Reset", regs, 0);
-
- /* Must die if the interrupt is not recoverable */
- if (!(regs->msr & MSR_RI))
- panic("Unrecoverable System Reset");
-
- /* What should we do here? We could issue a shutdown or hard reset. */
-}
-
-void machine_check_exception(struct pt_regs *regs)
-{
- int recover = 0;
-
- /* See if any machine dependent calls */
- if (ppc_md.machine_check_exception)
- recover = ppc_md.machine_check_exception(regs);
-
- if (recover)
- return;
-
- if (debugger_fault_handler(regs))
- return;
- die("Machine check", regs, 0);
-
- /* Must die if the interrupt is not recoverable */
- if (!(regs->msr & MSR_RI))
- panic("Unrecoverable Machine check");
-}
-
-void unknown_exception(struct pt_regs *regs)
-{
- printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
- regs->nip, regs->msr, regs->trap);
-
- _exception(SIGTRAP, regs, 0, 0);
-}
-
-void instruction_breakpoint_exception(struct pt_regs *regs)
-{
- if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5,
- 5, SIGTRAP) == NOTIFY_STOP)
- return;
- if (debugger_iabr_match(regs))
- return;
- _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
-}
-
-void __kprobes single_step_exception(struct pt_regs *regs)
-{
- regs->msr &= ~MSR_SE; /* Turn off 'trace' bit */
-
- if (notify_die(DIE_SSTEP, "single_step", regs, 5,
- 5, SIGTRAP) == NOTIFY_STOP)
- return;
- if (debugger_sstep(regs))
- return;
-
- _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
-}
-
-/*
- * After we have successfully emulated an instruction, we have to
- * check if the instruction was being single-stepped, and if so,
- * pretend we got a single-step exception. This was pointed out
- * by Kumar Gala. -- paulus
- */
-static inline void emulate_single_step(struct pt_regs *regs)
-{
- if (regs->msr & MSR_SE)
- single_step_exception(regs);
-}
-
-static void parse_fpe(struct pt_regs *regs)
-{
- int code = 0;
- unsigned long fpscr;
-
- flush_fp_to_thread(current);
-
- fpscr = current->thread.fpscr;
-
- /* Invalid operation */
- if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
- code = FPE_FLTINV;
-
- /* Overflow */
- else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX))
- code = FPE_FLTOVF;
-
- /* Underflow */
- else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX))
- code = FPE_FLTUND;
-
- /* Divide by zero */
- else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX))
- code = FPE_FLTDIV;
-
- /* Inexact result */
- else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX))
- code = FPE_FLTRES;
-
- _exception(SIGFPE, regs, code, regs->nip);
-}
-
-/*
- * Illegal instruction emulation support. Return non-zero if we can't
- * emulate, or -EFAULT if the associated memory access caused an access
- * fault. Return zero on success.
- */
-
-#define INST_MFSPR_PVR 0x7c1f42a6
-#define INST_MFSPR_PVR_MASK 0xfc1fffff
-
-#define INST_DCBA 0x7c0005ec
-#define INST_DCBA_MASK 0x7c0007fe
-
-#define INST_MCRXR 0x7c000400
-#define INST_MCRXR_MASK 0x7c0007fe
-
-static int emulate_instruction(struct pt_regs *regs)
-{
- unsigned int instword;
-
- if (!user_mode(regs))
- return -EINVAL;
-
- CHECK_FULL_REGS(regs);
-
- if (get_user(instword, (unsigned int __user *)(regs->nip)))
- return -EFAULT;
-
- /* Emulate the mfspr rD, PVR. */
- if ((instword & INST_MFSPR_PVR_MASK) == INST_MFSPR_PVR) {
- unsigned int rd;
-
- rd = (instword >> 21) & 0x1f;
- regs->gpr[rd] = mfspr(SPRN_PVR);
- return 0;
- }
-
- /* Emulating the dcba insn is just a no-op. */
- if ((instword & INST_DCBA_MASK) == INST_DCBA) {
- static int warned;
-
- if (!warned) {
- printk(KERN_WARNING
- "process %d (%s) uses obsolete 'dcba' insn\n",
- current->pid, current->comm);
- warned = 1;
- }
- return 0;
- }
-
- /* Emulate the mcrxr insn. */
- if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
- static int warned;
- unsigned int shift;
-
- if (!warned) {
- printk(KERN_WARNING
- "process %d (%s) uses obsolete 'mcrxr' insn\n",
- current->pid, current->comm);
- warned = 1;
- }
-
- shift = (instword >> 21) & 0x1c;
- regs->ccr &= ~(0xf0000000 >> shift);
- regs->ccr |= (regs->xer & 0xf0000000) >> shift;
- regs->xer &= ~0xf0000000;
- return 0;
- }
-
- return -EINVAL;
-}
-
-/*
- * Look through the list of trap instructions that are used for BUG(),
- * BUG_ON() and WARN_ON() and see if we hit one. At this point we know
- * that the exception was caused by a trap instruction of some kind.
- * Returns 1 if we should continue (i.e. it was a WARN_ON) or 0
- * otherwise.
- */
-extern struct bug_entry __start___bug_table[], __stop___bug_table[];
-
-#ifndef CONFIG_MODULES
-#define module_find_bug(x) NULL
-#endif
-
-struct bug_entry *find_bug(unsigned long bugaddr)
-{
- struct bug_entry *bug;
-
- for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
- if (bugaddr == bug->bug_addr)
- return bug;
- return module_find_bug(bugaddr);
-}
-
-static int
-check_bug_trap(struct pt_regs *regs)
-{
- struct bug_entry *bug;
- unsigned long addr;
-
- if (regs->msr & MSR_PR)
- return 0; /* not in kernel */
- addr = regs->nip; /* address of trap instruction */
- if (addr < PAGE_OFFSET)
- return 0;
- bug = find_bug(regs->nip);
- if (bug == NULL)
- return 0;
- if (bug->line & BUG_WARNING_TRAP) {
- /* this is a WARN_ON rather than BUG/BUG_ON */
- printk(KERN_ERR "Badness in %s at %s:%d\n",
- bug->function, bug->file,
- bug->line & ~BUG_WARNING_TRAP);
- show_stack(current, (void *)regs->gpr[1]);
- return 1;
- }
- printk(KERN_CRIT "kernel BUG in %s at %s:%d!\n",
- bug->function, bug->file, bug->line);
- return 0;
-}
-
-void __kprobes program_check_exception(struct pt_regs *regs)
-{
- if (debugger_fault_handler(regs))
- return;
-
- if (regs->msr & 0x100000) {
- /* IEEE FP exception */
- parse_fpe(regs);
- } else if (regs->msr & 0x20000) {
- /* trap exception */
-
- if (notify_die(DIE_BPT, "breakpoint", regs, 5,
- 5, SIGTRAP) == NOTIFY_STOP)
- return;
- if (debugger_bpt(regs))
- return;
-
- if (check_bug_trap(regs)) {
- regs->nip += 4;
- return;
- }
- _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
-
- } else {
- /* Privileged or illegal instruction; try to emulate it. */
- switch (emulate_instruction(regs)) {
- case 0:
- regs->nip += 4;
- emulate_single_step(regs);
- break;
-
- case -EFAULT:
- _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
- break;
-
- default:
- if (regs->msr & 0x40000)
- /* priveleged */
- _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
- else
- /* illegal */
- _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
- break;
- }
- }
-}
-
-void kernel_fp_unavailable_exception(struct pt_regs *regs)
-{
- printk(KERN_EMERG "Unrecoverable FP Unavailable Exception "
- "%lx at %lx\n", regs->trap, regs->nip);
- die("Unrecoverable FP Unavailable Exception", regs, SIGABRT);
-}
-
-void altivec_unavailable_exception(struct pt_regs *regs)
-{
- if (user_mode(regs)) {
- /* A user program has executed an altivec instruction,
- but this kernel doesn't support altivec. */
- _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
- return;
- }
- printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
- "%lx at %lx\n", regs->trap, regs->nip);
- die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
-}
-
-extern perf_irq_t perf_irq;
-
-void performance_monitor_exception(struct pt_regs *regs)
-{
- perf_irq(regs);
-}
-
-void alignment_exception(struct pt_regs *regs)
-{
- int fixed;
-
- fixed = fix_alignment(regs);
-
- if (fixed == 1) {
- regs->nip += 4; /* skip over emulated instruction */
- emulate_single_step(regs);
- return;
- }
-
- /* Operand address was bad */
- if (fixed == -EFAULT) {
- if (user_mode(regs)) {
- _exception(SIGSEGV, regs, SEGV_MAPERR, regs->dar);
- } else {
- /* Search exception table */
- bad_page_fault(regs, regs->dar, SIGSEGV);
- }
-
- return;
- }
-
- _exception(SIGBUS, regs, BUS_ADRALN, regs->nip);
-}
-
-#ifdef CONFIG_ALTIVEC
-void altivec_assist_exception(struct pt_regs *regs)
-{
- int err;
- siginfo_t info;
-
- if (!user_mode(regs)) {
- printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
- " at %lx\n", regs->nip);
- die("Kernel VMX/Altivec assist exception", regs, SIGILL);
- }
-
- flush_altivec_to_thread(current);
-
- err = emulate_altivec(regs);
- if (err == 0) {
- regs->nip += 4; /* skip emulated instruction */
- emulate_single_step(regs);
- return;
- }
-
- if (err == -EFAULT) {
- /* got an error reading the instruction */
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = (void __user *) regs->nip;
- force_sig_info(SIGSEGV, &info, current);
- } else {
- /* didn't recognize the instruction */
- /* XXX quick hack for now: set the non-Java bit in the VSCR */
- if (printk_ratelimit())
- printk(KERN_ERR "Unrecognized altivec instruction "
- "in %s at %lx\n", current->comm, regs->nip);
- current->thread.vscr.u[3] |= 0x10000;
- }
-}
-#endif /* CONFIG_ALTIVEC */
-
-/*
- * We enter here if we get an unrecoverable exception, that is, one
- * that happened at a point where the RI (recoverable interrupt) bit
- * in the MSR is 0. This indicates that SRR0/1 are live, and that
- * we therefore lost state by taking this exception.
- */
-void unrecoverable_exception(struct pt_regs *regs)
-{
- printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n",
- regs->trap, regs->nip);
- die("Unrecoverable exception", regs, SIGABRT);
-}
-
-/*
- * We enter here if we discover during exception entry that we are
- * running in supervisor mode with a userspace value in the stack pointer.
- */
-void kernel_bad_stack(struct pt_regs *regs)
-{
- printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n",
- regs->gpr[1], regs->nip);
- die("Bad kernel stack pointer", regs, SIGABRT);
-}
-
-void __init trap_init(void)
-{
-}
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