+++ /dev/null
-/*
- * 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/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.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/prctl.h>
-#include <linux/bug.h>
-
-#include <asm/pgtable.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/reg.h>
-#include <asm/xmon.h>
-#include <asm/pmc.h>
-
-#ifdef CONFIG_XMON
-extern int xmon_bpt(struct pt_regs *regs);
-extern int xmon_sstep(struct pt_regs *regs);
-extern int xmon_iabr_match(struct pt_regs *regs);
-extern int xmon_dabr_match(struct pt_regs *regs);
-
-int (*debugger)(struct pt_regs *regs) = xmon;
-int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
-int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
-int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
-int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
-void (*debugger_fault_handler)(struct pt_regs *regs);
-#else
-#ifdef CONFIG_KGDB
-int (*debugger)(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);
-void (*debugger_fault_handler)(struct pt_regs *regs);
-#else
-#define debugger(regs) do { } while (0)
-#define debugger_bpt(regs) 0
-#define debugger_sstep(regs) 0
-#define debugger_iabr_match(regs) 0
-#define debugger_dabr_match(regs) 0
-#define debugger_fault_handler ((void (*)(struct pt_regs *))0)
-#endif
-#endif
-
-/*
- * Trap & Exception support
- */
-
-DEFINE_SPINLOCK(die_lock);
-
-int die(const char * str, struct pt_regs * fp, long err)
-{
- static int die_counter;
- int nl = 0;
- console_verbose();
- spin_lock_irq(&die_lock);
- 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
- if (nl)
- printk("\n");
- show_regs(fp);
- add_taint(TAINT_DIE);
- spin_unlock_irq(&die_lock);
- /* do_exit() should take care of panic'ing from an interrupt
- * context so we don't handle it here
- */
- do_exit(err);
-}
-
-void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
-{
- siginfo_t info;
-
- if (!user_mode(regs)) {
- debugger(regs);
- die("Exception in kernel mode", regs, signr);
- }
- info.si_signo = signr;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void __user *) addr;
- force_sig_info(signr, &info, current);
-
- /*
- * Init gets no signals that it doesn't have a handler for.
- * That's all very well, but if it has caused a synchronous
- * exception and we ignore the resulting signal, it will just
- * generate the same exception over and over again and we get
- * nowhere. Better to kill it and let the kernel panic.
- */
- if (is_global_init(current)) {
- __sighandler_t handler;
-
- spin_lock_irq(¤t->sighand->siglock);
- handler = current->sighand->action[signr-1].sa.sa_handler;
- spin_unlock_irq(¤t->sighand->siglock);
- if (handler == SIG_DFL) {
- /* init has generated a synchronous exception
- and it doesn't have a handler for the signal */
- printk(KERN_CRIT "init has generated signal %d "
- "but has no handler for it\n", signr);
- do_exit(signr);
- }
- }
-}
-
-/*
- * I/O accesses can cause machine checks on powermacs.
- * Check if the NIP corresponds to the address of a sync
- * instruction for which there is an entry in the exception
- * table.
- * Note that the 601 only takes a machine check on TEA
- * (transfer error ack) signal assertion, and does not
- * set any of the top 16 bits of SRR1.
- * -- paulus.
- */
-static inline int check_io_access(struct pt_regs *regs)
-{
-#if defined CONFIG_8xx
- unsigned long msr = regs->msr;
- const struct exception_table_entry *entry;
- unsigned int *nip = (unsigned int *)regs->nip;
-
- if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000)))
- && (entry = search_exception_tables(regs->nip)) != NULL) {
- /*
- * Check that it's a sync instruction, or somewhere
- * in the twi; isync; nop sequence that inb/inw/inl uses.
- * As the address is in the exception table
- * we should be able to read the instr there.
- * For the debug message, we look at the preceding
- * load or store.
- */
- if (*nip == 0x60000000) /* nop */
- nip -= 2;
- else if (*nip == 0x4c00012c) /* isync */
- --nip;
- /* eieio from I/O string functions */
- else if ((*nip) == 0x7c0006ac || *(nip+1) == 0x7c0006ac)
- nip += 2;
- if (*nip == 0x7c0004ac || (*nip >> 26) == 3 ||
- (*(nip+1) >> 26) == 3) {
- /* sync or twi */
- unsigned int rb;
-
- --nip;
- rb = (*nip >> 11) & 0x1f;
- printk(KERN_DEBUG "%s bad port %lx at %p\n",
- (*nip & 0x100)? "OUT to": "IN from",
- regs->gpr[rb] - _IO_BASE, nip);
- regs->msr |= MSR_RI;
- regs->nip = entry->fixup;
- return 1;
- }
- }
-#endif /* CONFIG_8xx */
- return 0;
-}
-
-#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
-/* On 4xx, the reason for the machine check or program exception
- is in the ESR. */
-#define get_reason(regs) ((regs)->dsisr)
-#define get_mc_reason(regs) ((regs)->dsisr)
-#define REASON_FP ESR_FP
-#define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
-#define REASON_PRIVILEGED ESR_PPR
-#define REASON_TRAP ESR_PTR
-
-/* single-step stuff */
-#define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC)
-#define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC)
-
-#else
-/* On non-4xx, the reason for the machine check or program
- exception is in the MSR. */
-#define get_reason(regs) ((regs)->msr)
-#define get_mc_reason(regs) ((regs)->msr)
-#define REASON_FP 0x100000
-#define REASON_ILLEGAL 0x80000
-#define REASON_PRIVILEGED 0x40000
-#define REASON_TRAP 0x20000
-
-#define single_stepping(regs) ((regs)->msr & MSR_SE)
-#define clear_single_step(regs) ((regs)->msr &= ~MSR_SE)
-#endif
-
-/*
- * This is "fall-back" implementation for configurations
- * which don't provide platform-specific machine check info
- */
-void __attribute__ ((weak))
-platform_machine_check(struct pt_regs *regs)
-{
-}
-
-#if defined(CONFIG_4xx)
-int machine_check_4xx(struct pt_regs *regs)
-{
- unsigned long reason = get_mc_reason(regs);
-
- if (reason & ESR_IMCP) {
- printk("Instruction");
- mtspr(SPRN_ESR, reason & ~ESR_IMCP);
- } else
- printk("Data");
- printk(" machine check in kernel mode.\n");
-
- return 0;
-}
-
-int machine_check_440A(struct pt_regs *regs)
-{
- unsigned long reason = get_mc_reason(regs);
-
- printk("Machine check in kernel mode.\n");
- if (reason & ESR_IMCP){
- printk("Instruction Synchronous Machine Check exception\n");
- mtspr(SPRN_ESR, reason & ~ESR_IMCP);
- }
- else {
- u32 mcsr = mfspr(SPRN_MCSR);
- if (mcsr & MCSR_IB)
- printk("Instruction Read PLB Error\n");
- if (mcsr & MCSR_DRB)
- printk("Data Read PLB Error\n");
- if (mcsr & MCSR_DWB)
- printk("Data Write PLB Error\n");
- if (mcsr & MCSR_TLBP)
- printk("TLB Parity Error\n");
- if (mcsr & MCSR_ICP){
- flush_instruction_cache();
- printk("I-Cache Parity Error\n");
- }
- if (mcsr & MCSR_DCSP)
- printk("D-Cache Search Parity Error\n");
- if (mcsr & MCSR_DCFP)
- printk("D-Cache Flush Parity Error\n");
- if (mcsr & MCSR_IMPE)
- printk("Machine Check exception is imprecise\n");
-
- /* Clear MCSR */
- mtspr(SPRN_MCSR, mcsr);
- }
- return 0;
-}
-#else
-int machine_check_generic(struct pt_regs *regs)
-{
- unsigned long reason = get_mc_reason(regs);
-
- printk("Machine check in kernel mode.\n");
- printk("Caused by (from SRR1=%lx): ", reason);
- switch (reason & 0x601F0000) {
- case 0x80000:
- printk("Machine check signal\n");
- break;
- case 0: /* for 601 */
- case 0x40000:
- case 0x140000: /* 7450 MSS error and TEA */
- printk("Transfer error ack signal\n");
- break;
- case 0x20000:
- printk("Data parity error signal\n");
- break;
- case 0x10000:
- printk("Address parity error signal\n");
- break;
- case 0x20000000:
- printk("L1 Data Cache error\n");
- break;
- case 0x40000000:
- printk("L1 Instruction Cache error\n");
- break;
- case 0x00100000:
- printk("L2 data cache parity error\n");
- break;
- default:
- printk("Unknown values in msr\n");
- }
- return 0;
-}
-#endif /* everything else */
-
-void machine_check_exception(struct pt_regs *regs)
-{
- int recover = 0;
-
- if (cur_cpu_spec->machine_check)
- recover = cur_cpu_spec->machine_check(regs);
- if (recover > 0)
- return;
-
- if (user_mode(regs)) {
- regs->msr |= MSR_RI;
- _exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
- return;
- }
-
-#if defined(CONFIG_8xx) && defined(CONFIG_PCI)
- /* the qspan pci read routines can cause machine checks -- Cort */
- bad_page_fault(regs, regs->dar, SIGBUS);
- return;
-#endif
-
- if (debugger_fault_handler) {
- debugger_fault_handler(regs);
- regs->msr |= MSR_RI;
- return;
- }
-
- if (check_io_access(regs))
- return;
-
- /*
- * Optional platform-provided routine to print out
- * additional info, e.g. bus error registers.
- */
- platform_machine_check(regs);
-
- debugger(regs);
- die("machine check", regs, SIGBUS);
-}
-
-void SMIException(struct pt_regs *regs)
-{
- debugger(regs);
-#if !(defined(CONFIG_XMON) || defined(CONFIG_KGDB))
- show_regs(regs);
- panic("System Management Interrupt");
-#endif
-}
-
-void unknown_exception(struct pt_regs *regs)
-{
- printk("Bad trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
- regs->nip, regs->msr, regs->trap, print_tainted());
- _exception(SIGTRAP, regs, 0, 0);
-}
-
-void instruction_breakpoint_exception(struct pt_regs *regs)
-{
- if (debugger_iabr_match(regs))
- return;
- _exception(SIGTRAP, regs, TRAP_BRKPT, 0);
-}
-
-void RunModeException(struct pt_regs *regs)
-{
- _exception(SIGTRAP, regs, 0, 0);
-}
-
-/* Illegal instruction emulation support. Originally written to
- * provide the PVR to user applications using the mfspr rd, PVR.
- * Return non-zero if we can't emulate, or -EFAULT if the associated
- * memory access caused an access fault. Return zero on success.
- *
- * There are a couple of ways to do this, either "decode" the instruction
- * or directly match lots of bits. In this case, matching lots of
- * bits is faster and easier.
- *
- */
-#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
-
-#define INST_STRING 0x7c00042a
-#define INST_STRING_MASK 0x7c0007fe
-#define INST_STRING_GEN_MASK 0x7c00067e
-#define INST_LSWI 0x7c0004aa
-#define INST_LSWX 0x7c00042a
-#define INST_STSWI 0x7c0005aa
-#define INST_STSWX 0x7c00052a
-
-static int emulate_string_inst(struct pt_regs *regs, u32 instword)
-{
- u8 rT = (instword >> 21) & 0x1f;
- u8 rA = (instword >> 16) & 0x1f;
- u8 NB_RB = (instword >> 11) & 0x1f;
- u32 num_bytes;
- unsigned long EA;
- int pos = 0;
-
- /* Early out if we are an invalid form of lswx */
- if ((instword & INST_STRING_MASK) == INST_LSWX)
- if ((rT == rA) || (rT == NB_RB))
- return -EINVAL;
-
- EA = (rA == 0) ? 0 : regs->gpr[rA];
-
- switch (instword & INST_STRING_MASK) {
- case INST_LSWX:
- case INST_STSWX:
- EA += NB_RB;
- num_bytes = regs->xer & 0x7f;
- break;
- case INST_LSWI:
- case INST_STSWI:
- num_bytes = (NB_RB == 0) ? 32 : NB_RB;
- break;
- default:
- return -EINVAL;
- }
-
- while (num_bytes != 0)
- {
- u8 val;
- u32 shift = 8 * (3 - (pos & 0x3));
-
- switch ((instword & INST_STRING_MASK)) {
- case INST_LSWX:
- case INST_LSWI:
- if (get_user(val, (u8 __user *)EA))
- return -EFAULT;
- /* first time updating this reg,
- * zero it out */
- if (pos == 0)
- regs->gpr[rT] = 0;
- regs->gpr[rT] |= val << shift;
- break;
- case INST_STSWI:
- case INST_STSWX:
- val = regs->gpr[rT] >> shift;
- if (put_user(val, (u8 __user *)EA))
- return -EFAULT;
- break;
- }
- /* move EA to next address */
- EA += 1;
- num_bytes--;
-
- /* manage our position within the register */
- if (++pos == 4) {
- pos = 0;
- if (++rT == 32)
- rT = 0;
- }
- }
-
- return 0;
-}
-
-static int emulate_instruction(struct pt_regs *regs)
-{
- u32 instword;
- u32 rd;
-
- if (!user_mode(regs))
- return -EINVAL;
- CHECK_FULL_REGS(regs);
-
- if (get_user(instword, (u32 __user *)(regs->nip)))
- return -EFAULT;
-
- /* Emulate the mfspr rD, PVR.
- */
- if ((instword & INST_MFSPR_PVR_MASK) == INST_MFSPR_PVR) {
- 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)
- return 0;
-
- /* Emulate the mcrxr insn. */
- if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
- int shift = (instword >> 21) & 0x1c;
- unsigned long msk = 0xf0000000UL >> shift;
-
- regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk);
- regs->xer &= ~0xf0000000UL;
- return 0;
- }
-
- /* Emulate load/store string insn. */
- if ((instword & INST_STRING_GEN_MASK) == INST_STRING)
- return emulate_string_inst(regs, instword);
-
- return -EINVAL;
-}
-
-/*
- * 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 void emulate_single_step(struct pt_regs *regs)
-{
- if (single_stepping(regs)) {
- clear_single_step(regs);
- _exception(SIGTRAP, regs, TRAP_TRACE, 0);
- }
-}
-
-int is_valid_bugaddr(unsigned long addr)
-{
- return addr >= PAGE_OFFSET;
-}
-
-void program_check_exception(struct pt_regs *regs)
-{
- unsigned int reason = get_reason(regs);
- extern int do_mathemu(struct pt_regs *regs);
-
-#ifdef CONFIG_MATH_EMULATION
- /* (reason & REASON_ILLEGAL) would be the obvious thing here,
- * but there seems to be a hardware bug on the 405GP (RevD)
- * that means ESR is sometimes set incorrectly - either to
- * ESR_DST (!?) or 0. In the process of chasing this with the
- * hardware people - not sure if it can happen on any illegal
- * instruction or only on FP instructions, whether there is a
- * pattern to occurrences etc. -dgibson 31/Mar/2003 */
- if (!(reason & REASON_TRAP) && do_mathemu(regs) == 0) {
- emulate_single_step(regs);
- return;
- }
-#endif /* CONFIG_MATH_EMULATION */
-
- if (reason & REASON_FP) {
- /* IEEE FP exception */
- int code = 0;
- u32 fpscr;
-
- /* We must make sure the FP state is consistent with
- * our MSR_FP in regs
- */
- preempt_disable();
- if (regs->msr & MSR_FP)
- giveup_fpu(current);
- preempt_enable();
-
- fpscr = current->thread.fpscr.val;
- fpscr &= fpscr << 22; /* mask summary bits with enables */
- if (fpscr & FPSCR_VX)
- code = FPE_FLTINV;
- else if (fpscr & FPSCR_OX)
- code = FPE_FLTOVF;
- else if (fpscr & FPSCR_UX)
- code = FPE_FLTUND;
- else if (fpscr & FPSCR_ZX)
- code = FPE_FLTDIV;
- else if (fpscr & FPSCR_XX)
- code = FPE_FLTRES;
- _exception(SIGFPE, regs, code, regs->nip);
- return;
- }
-
- if (reason & REASON_TRAP) {
- /* trap exception */
- if (debugger_bpt(regs))
- return;
-
- if (!(regs->msr & MSR_PR) && /* not user-mode */
- report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
- regs->nip += 4;
- return;
- }
- _exception(SIGTRAP, regs, TRAP_BRKPT, 0);
- return;
- }
-
- /* Try to emulate it if we should. */
- if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
- switch (emulate_instruction(regs)) {
- case 0:
- regs->nip += 4;
- emulate_single_step(regs);
- return;
- case -EFAULT:
- _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
- return;
- }
- }
-
- if (reason & REASON_PRIVILEGED)
- _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
- else
- _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
-}
-
-void single_step_exception(struct pt_regs *regs)
-{
- regs->msr &= ~(MSR_SE | MSR_BE); /* Turn off 'trace' bits */
- if (debugger_sstep(regs))
- return;
- _exception(SIGTRAP, regs, TRAP_TRACE, 0);
-}
-
-void alignment_exception(struct pt_regs *regs)
-{
- int sig, code, fixed = 0;
-
- fixed = fix_alignment(regs);
- if (fixed == 1) {
- regs->nip += 4; /* skip over emulated instruction */
- emulate_single_step(regs);
- return;
- }
- if (fixed == -EFAULT) {
- sig = SIGSEGV;
- code = SEGV_ACCERR;
- } else {
- sig = SIGBUS;
- code = BUS_ADRALN;
- }
- if (user_mode(regs))
- _exception(sig, regs, code, regs->dar);
- else
- bad_page_fault(regs, regs->dar, sig);
-}
-
-void StackOverflow(struct pt_regs *regs)
-{
- printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
- current, regs->gpr[1]);
- debugger(regs);
- show_regs(regs);
- panic("kernel stack overflow");
-}
-
-void nonrecoverable_exception(struct pt_regs *regs)
-{
- printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n",
- regs->nip, regs->msr);
- debugger(regs);
- die("nonrecoverable exception", regs, SIGKILL);
-}
-
-void trace_syscall(struct pt_regs *regs)
-{
- printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n",
- current, current->pid, regs->nip, regs->link, regs->gpr[0],
- regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted());
-}
-
-#ifdef CONFIG_8xx
-void SoftwareEmulation(struct pt_regs *regs)
-{
- extern int do_mathemu(struct pt_regs *);
- extern int Soft_emulate_8xx(struct pt_regs *);
- int errcode;
-
- CHECK_FULL_REGS(regs);
-
- if (!user_mode(regs)) {
- debugger(regs);
- die("Kernel Mode Software FPU Emulation", regs, SIGFPE);
- }
-
-#ifdef CONFIG_MATH_EMULATION
- errcode = do_mathemu(regs);
-#else
- errcode = Soft_emulate_8xx(regs);
-#endif
- if (errcode) {
- if (errcode > 0)
- _exception(SIGFPE, regs, 0, 0);
- else if (errcode == -EFAULT)
- _exception(SIGSEGV, regs, 0, 0);
- else
- _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
- } else
- emulate_single_step(regs);
-}
-#endif /* CONFIG_8xx */
-
-#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
-
-void DebugException(struct pt_regs *regs, unsigned long debug_status)
-{
- if (debug_status & DBSR_IC) { /* instruction completion */
- regs->msr &= ~MSR_DE;
- if (user_mode(regs)) {
- current->thread.dbcr0 &= ~DBCR0_IC;
- } else {
- /* Disable instruction completion */
- mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
- /* Clear the instruction completion event */
- mtspr(SPRN_DBSR, DBSR_IC);
- if (debugger_sstep(regs))
- return;
- }
- _exception(SIGTRAP, regs, TRAP_TRACE, 0);
- }
-}
-#endif /* CONFIG_4xx || CONFIG_BOOKE */
-
-#if !defined(CONFIG_TAU_INT)
-void TAUException(struct pt_regs *regs)
-{
- printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
- regs->nip, regs->msr, regs->trap, print_tainted());
-}
-#endif /* CONFIG_INT_TAU */
-
-/*
- * FP unavailable trap from kernel - print a message, but let
- * the task use FP in the kernel until it returns to user mode.
- */
-void kernel_fp_unavailable_exception(struct pt_regs *regs)
-{
- regs->msr |= MSR_FP;
- printk(KERN_ERR "floating point used in kernel (task=%p, pc=%lx)\n",
- current, regs->nip);
-}
-
-void altivec_unavailable_exception(struct pt_regs *regs)
-{
- static int kernel_altivec_count;
-
-#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
- /* The kernel has executed an altivec instruction without
- first enabling altivec. Whinge but let it do it. */
- if (++kernel_altivec_count < 10)
- printk(KERN_ERR "AltiVec used in kernel (task=%p, pc=%lx)\n",
- current, regs->nip);
- regs->msr |= MSR_VEC;
-}
-
-#ifdef CONFIG_ALTIVEC
-void altivec_assist_exception(struct pt_regs *regs)
-{
- int err;
-
- preempt_disable();
- if (regs->msr & MSR_VEC)
- giveup_altivec(current);
- preempt_enable();
- if (!user_mode(regs)) {
- printk(KERN_ERR "altivec assist exception in kernel mode"
- " at %lx\n", regs->nip);
- debugger(regs);
- die("altivec assist exception", regs, SIGFPE);
- return;
- }
-
- 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 */
- _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
- } else {
- /* didn't recognize the instruction */
- /* XXX quick hack for now: set the non-Java bit in the VSCR */
- printk(KERN_ERR "unrecognized altivec instruction "
- "in %s at %lx\n", current->comm, regs->nip);
- current->thread.vscr.u[3] |= 0x10000;
- }
-}
-#endif /* CONFIG_ALTIVEC */
-
-#ifdef CONFIG_BOOKE_WDT
-/*
- * Default handler for a Watchdog exception,
- * spins until a reboot occurs
- */
-void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs)
-{
- /* Generic WatchdogHandler, implement your own */
- mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE));
- return;
-}
-
-void WatchdogException(struct pt_regs *regs)
-{
- printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n");
- WatchdogHandler(regs);
-}
-#endif
-
-void __init trap_init(void)
-{
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff