Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 565 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/traps.c b/arch/ppc64/kernel/traps.c
new file mode 100644
index 000000000000..10fc61f3f6a4
--- /dev/null
+++ b/arch/ppc64/kernel/traps.c
@@ -0,0 +1,565 @@
+/*
+ *  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 <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 *ppc64_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(&ppc64_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;
+        }
+        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 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,
+                      (unsigned int)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, (unsigned int)bug->line);
+        return 0;
+}
+
+void 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)
+{
+#ifndef CONFIG_ALTIVEC
+        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;
+        }
+#endif
+        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)
+{
+}