| /* |
| * 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@samba.org) |
| */ |
| |
| /* |
| * 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/delay.h> |
| #include <linux/kprobes.h> |
| #include <linux/kexec.h> |
| #include <linux/backlight.h> |
| #include <linux/bug.h> |
| |
| #include <asm/kdebug.h> |
| #include <asm/pgtable.h> |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| #include <asm/io.h> |
| #include <asm/machdep.h> |
| #include <asm/rtas.h> |
| #include <asm/pmc.h> |
| #ifdef CONFIG_PPC32 |
| #include <asm/reg.h> |
| #endif |
| #ifdef CONFIG_PMAC_BACKLIGHT |
| #include <asm/backlight.h> |
| #endif |
| #ifdef CONFIG_PPC64 |
| #include <asm/firmware.h> |
| #include <asm/processor.h> |
| #endif |
| #include <asm/kexec.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 |
| |
| ATOMIC_NOTIFIER_HEAD(powerpc_die_chain); |
| |
| int register_die_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_register(&powerpc_die_chain, nb); |
| } |
| EXPORT_SYMBOL(register_die_notifier); |
| |
| int unregister_die_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_unregister(&powerpc_die_chain, nb); |
| } |
| EXPORT_SYMBOL(unregister_die_notifier); |
| |
| /* |
| * Trap & Exception support |
| */ |
| |
| static DEFINE_SPINLOCK(die_lock); |
| |
| int die(const char *str, struct pt_regs *regs, long err) |
| { |
| static int die_counter; |
| |
| if (debugger(regs)) |
| return 1; |
| |
| console_verbose(); |
| spin_lock_irq(&die_lock); |
| bust_spinlocks(1); |
| #ifdef CONFIG_PMAC_BACKLIGHT |
| mutex_lock(&pmac_backlight_mutex); |
| if (machine_is(powermac) && pmac_backlight) { |
| struct backlight_properties *props; |
| |
| down(&pmac_backlight->sem); |
| props = pmac_backlight->props; |
| props->brightness = props->max_brightness; |
| props->power = FB_BLANK_UNBLANK; |
| props->update_status(pmac_backlight); |
| up(&pmac_backlight->sem); |
| } |
| mutex_unlock(&pmac_backlight_mutex); |
| #endif |
| printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter); |
| #ifdef CONFIG_PREEMPT |
| printk("PREEMPT "); |
| #endif |
| #ifdef CONFIG_SMP |
| printk("SMP NR_CPUS=%d ", NR_CPUS); |
| #endif |
| #ifdef CONFIG_DEBUG_PAGEALLOC |
| printk("DEBUG_PAGEALLOC "); |
| #endif |
| #ifdef CONFIG_NUMA |
| printk("NUMA "); |
| #endif |
| printk("%s\n", ppc_md.name ? "" : ppc_md.name); |
| |
| print_modules(); |
| show_regs(regs); |
| bust_spinlocks(0); |
| spin_unlock_irq(&die_lock); |
| |
| if (kexec_should_crash(current) || |
| kexec_sr_activated(smp_processor_id())) |
| crash_kexec(regs); |
| crash_kexec_secondary(regs); |
| |
| if (in_interrupt()) |
| panic("Fatal exception in interrupt"); |
| |
| if (panic_on_oops) |
| panic("Fatal exception"); |
| |
| do_exit(err); |
| |
| 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); |
| |
| /* |
| * 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_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); |
| } |
| } |
| } |
| |
| #ifdef CONFIG_PPC64 |
| void system_reset_exception(struct pt_regs *regs) |
| { |
| /* See if any machine dependent calls */ |
| if (ppc_md.system_reset_exception) { |
| if (ppc_md.system_reset_exception(regs)) |
| return; |
| } |
| |
| #ifdef CONFIG_KEXEC |
| cpu_set(smp_processor_id(), cpus_in_sr); |
| #endif |
| |
| die("System Reset", regs, SIGABRT); |
| |
| /* |
| * Some CPUs when released from the debugger will execute this path. |
| * These CPUs entered the debugger via a soft-reset. If the CPU was |
| * hung before entering the debugger it will return to the hung |
| * state when exiting this function. This causes a problem in |
| * kdump since the hung CPU(s) will not respond to the IPI sent |
| * from kdump. To prevent the problem we call crash_kexec_secondary() |
| * here. If a kdump had not been initiated or we exit the debugger |
| * with the "exit and recover" command (x) crash_kexec_secondary() |
| * will return after 5ms and the CPU returns to its previous state. |
| */ |
| crash_kexec_secondary(regs); |
| |
| /* 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. */ |
| } |
| #endif |
| |
| /* |
| * 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) |
| { |
| #ifdef CONFIG_PPC32 |
| 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; |
| if (*nip == 0x7c0004ac || (*nip >> 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_PPC32 */ |
| 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) |
| #ifndef CONFIG_FSL_BOOKE |
| #define get_mc_reason(regs) ((regs)->dsisr) |
| #else |
| #define get_mc_reason(regs) (mfspr(SPRN_MCSR)) |
| #endif |
| #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) |
| { |
| } |
| |
| void machine_check_exception(struct pt_regs *regs) |
| { |
| int recover = 0; |
| unsigned long reason = get_mc_reason(regs); |
| |
| /* See if any machine dependent calls */ |
| if (ppc_md.machine_check_exception) |
| recover = ppc_md.machine_check_exception(regs); |
| |
| if (recover) |
| 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(regs)) { |
| regs->msr |= MSR_RI; |
| return; |
| } |
| |
| if (check_io_access(regs)) |
| return; |
| |
| #if defined(CONFIG_4xx) && !defined(CONFIG_440A) |
| if (reason & ESR_IMCP) { |
| printk("Instruction"); |
| mtspr(SPRN_ESR, reason & ~ESR_IMCP); |
| } else |
| printk("Data"); |
| printk(" machine check in kernel mode.\n"); |
| #elif defined(CONFIG_440A) |
| 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); |
| } |
| #elif defined (CONFIG_E500) |
| printk("Machine check in kernel mode.\n"); |
| printk("Caused by (from MCSR=%lx): ", reason); |
| |
| if (reason & MCSR_MCP) |
| printk("Machine Check Signal\n"); |
| if (reason & MCSR_ICPERR) |
| printk("Instruction Cache Parity Error\n"); |
| if (reason & MCSR_DCP_PERR) |
| printk("Data Cache Push Parity Error\n"); |
| if (reason & MCSR_DCPERR) |
| printk("Data Cache Parity Error\n"); |
| if (reason & MCSR_GL_CI) |
| printk("Guarded Load or Cache-Inhibited stwcx.\n"); |
| if (reason & MCSR_BUS_IAERR) |
| printk("Bus - Instruction Address Error\n"); |
| if (reason & MCSR_BUS_RAERR) |
| printk("Bus - Read Address Error\n"); |
| if (reason & MCSR_BUS_WAERR) |
| printk("Bus - Write Address Error\n"); |
| if (reason & MCSR_BUS_IBERR) |
| printk("Bus - Instruction Data Error\n"); |
| if (reason & MCSR_BUS_RBERR) |
| printk("Bus - Read Data Bus Error\n"); |
| if (reason & MCSR_BUS_WBERR) |
| printk("Bus - Read Data Bus Error\n"); |
| if (reason & MCSR_BUS_IPERR) |
| printk("Bus - Instruction Parity Error\n"); |
| if (reason & MCSR_BUS_RPERR) |
| printk("Bus - Read Parity Error\n"); |
| #elif defined (CONFIG_E200) |
| printk("Machine check in kernel mode.\n"); |
| printk("Caused by (from MCSR=%lx): ", reason); |
| |
| if (reason & MCSR_MCP) |
| printk("Machine Check Signal\n"); |
| if (reason & MCSR_CP_PERR) |
| printk("Cache Push Parity Error\n"); |
| if (reason & MCSR_CPERR) |
| printk("Cache Parity Error\n"); |
| if (reason & MCSR_EXCP_ERR) |
| printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n"); |
| if (reason & MCSR_BUS_IRERR) |
| printk("Bus - Read Bus Error on instruction fetch\n"); |
| if (reason & MCSR_BUS_DRERR) |
| printk("Bus - Read Bus Error on data load\n"); |
| if (reason & MCSR_BUS_WRERR) |
| printk("Bus - Write Bus Error on buffered store or cache line push\n"); |
| #else /* !CONFIG_4xx && !CONFIG_E500 && !CONFIG_E200 */ |
| 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"); |
| } |
| #endif /* CONFIG_4xx */ |
| |
| /* |
| * Optional platform-provided routine to print out |
| * additional info, e.g. bus error registers. |
| */ |
| platform_machine_check(regs); |
| |
| if (debugger_fault_handler(regs)) |
| return; |
| die("Machine check", regs, SIGBUS); |
| |
| /* Must die if the interrupt is not recoverable */ |
| if (!(regs->msr & MSR_RI)) |
| panic("Unrecoverable Machine check"); |
| } |
| |
| void SMIException(struct pt_regs *regs) |
| { |
| die("System Management Interrupt", regs, SIGABRT); |
| } |
| |
| 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 RunModeException(struct pt_regs *regs) |
| { |
| _exception(SIGTRAP, regs, 0, 0); |
| } |
| |
| void __kprobes single_step_exception(struct pt_regs *regs) |
| { |
| regs->msr &= ~(MSR_SE | MSR_BE); /* Turn off 'trace' bits */ |
| |
| 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 void emulate_single_step(struct pt_regs *regs) |
| { |
| if (single_stepping(regs)) { |
| clear_single_step(regs); |
| _exception(SIGTRAP, regs, TRAP_TRACE, 0); |
| } |
| } |
| |
| static inline int __parse_fpscr(unsigned long fpscr) |
| { |
| int ret = 0; |
| |
| /* Invalid operation */ |
| if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) |
| ret = FPE_FLTINV; |
| |
| /* Overflow */ |
| else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX)) |
| ret = FPE_FLTOVF; |
| |
| /* Underflow */ |
| else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX)) |
| ret = FPE_FLTUND; |
| |
| /* Divide by zero */ |
| else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX)) |
| ret = FPE_FLTDIV; |
| |
| /* Inexact result */ |
| else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX)) |
| ret = FPE_FLTRES; |
| |
| return ret; |
| } |
| |
| static void parse_fpe(struct pt_regs *regs) |
| { |
| int code = 0; |
| |
| flush_fp_to_thread(current); |
| |
| code = __parse_fpscr(current->thread.fpscr.val); |
| |
| _exception(SIGFPE, regs, code, regs->nip); |
| } |
| |
| /* |
| * 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 0xfc0007fe |
| |
| #define INST_MCRXR 0x7c000400 |
| #define INST_MCRXR_MASK 0xfc0007fe |
| |
| #define INST_STRING 0x7c00042a |
| #define INST_STRING_MASK 0xfc0007fe |
| #define INST_STRING_GEN_MASK 0xfc00067e |
| #define INST_LSWI 0x7c0004aa |
| #define INST_LSWX 0x7c00042a |
| #define INST_STSWI 0x7c0005aa |
| #define INST_STSWX 0x7c00052a |
| |
| #define INST_POPCNTB 0x7c0000f4 |
| #define INST_POPCNTB_MASK 0xfc0007fe |
| |
| 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_popcntb_inst(struct pt_regs *regs, u32 instword) |
| { |
| u32 ra,rs; |
| unsigned long tmp; |
| |
| ra = (instword >> 16) & 0x1f; |
| rs = (instword >> 21) & 0x1f; |
| |
| tmp = regs->gpr[rs]; |
| tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL); |
| tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL); |
| tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL; |
| regs->gpr[ra] = tmp; |
| |
| return 0; |
| } |
| |
| static int emulate_instruction(struct pt_regs *regs) |
| { |
| u32 instword; |
| u32 rd; |
| |
| if (!user_mode(regs) || (regs->msr & MSR_LE)) |
| 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); |
| |
| /* Emulate the popcntb (Population Count Bytes) instruction. */ |
| if ((instword & INST_POPCNTB_MASK) == INST_POPCNTB) { |
| return emulate_popcntb_inst(regs, instword); |
| } |
| |
| return -EINVAL; |
| } |
| |
| int is_valid_bugaddr(unsigned long addr) |
| { |
| return is_kernel_addr(addr); |
| } |
| |
| void __kprobes program_check_exception(struct pt_regs *regs) |
| { |
| unsigned int reason = get_reason(regs); |
| extern int do_mathemu(struct pt_regs *regs); |
| |
| /* We can now get here via a FP Unavailable exception if the core |
| * has no FPU, in that case the reason flags will be 0 */ |
| |
| if (reason & REASON_FP) { |
| /* IEEE FP exception */ |
| parse_fpe(regs); |
| return; |
| } |
| if (reason & REASON_TRAP) { |
| /* trap exception */ |
| if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP) |
| == NOTIFY_STOP) |
| return; |
| if (debugger_bpt(regs)) |
| return; |
| |
| if (!(regs->msr & MSR_PR) && /* not user-mode */ |
| report_bug(regs->nip) == BUG_TRAP_TYPE_WARN) { |
| regs->nip += 4; |
| return; |
| } |
| _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); |
| return; |
| } |
| |
| local_irq_enable(); |
| |
| #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 occurences etc. -dgibson 31/Mar/2003 */ |
| switch (do_mathemu(regs)) { |
| case 0: |
| emulate_single_step(regs); |
| return; |
| case 1: { |
| int code = 0; |
| code = __parse_fpscr(current->thread.fpscr.val); |
| _exception(SIGFPE, regs, code, regs->nip); |
| return; |
| } |
| case -EFAULT: |
| _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); |
| return; |
| } |
| /* fall through on any other errors */ |
| #endif /* CONFIG_MATH_EMULATION */ |
| |
| /* 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 alignment_exception(struct pt_regs *regs) |
| { |
| int sig, code, fixed = 0; |
| |
| /* we don't implement logging of alignment exceptions */ |
| if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS)) |
| 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) { |
| 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()); |
| } |
| |
| 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); |
| } |
| |
| void performance_monitor_exception(struct pt_regs *regs) |
| { |
| perf_irq(regs); |
| } |
| |
| #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); |
| |
| switch (errcode) { |
| case 0: |
| emulate_single_step(regs); |
| return; |
| case 1: { |
| int code = 0; |
| code = __parse_fpscr(current->thread.fpscr.val); |
| _exception(SIGFPE, regs, code, regs->nip); |
| return; |
| } |
| case -EFAULT: |
| _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); |
| return; |
| default: |
| _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); |
| return; |
| } |
| |
| #else |
| errcode = Soft_emulate_8xx(regs); |
| switch (errcode) { |
| case 0: |
| emulate_single_step(regs); |
| return; |
| case 1: |
| _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); |
| return; |
| case -EFAULT: |
| _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); |
| return; |
| } |
| #endif |
| } |
| #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 */ |
| |
| #ifdef CONFIG_ALTIVEC |
| void altivec_assist_exception(struct pt_regs *regs) |
| { |
| int err; |
| |
| 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 */ |
| _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 */ |
| 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 */ |
| |
| #ifdef CONFIG_FSL_BOOKE |
| void CacheLockingException(struct pt_regs *regs, unsigned long address, |
| unsigned long error_code) |
| { |
| /* We treat cache locking instructions from the user |
| * as priv ops, in the future we could try to do |
| * something smarter |
| */ |
| if (error_code & (ESR_DLK|ESR_ILK)) |
| _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); |
| return; |
| } |
| #endif /* CONFIG_FSL_BOOKE */ |
| |
| #ifdef CONFIG_SPE |
| void SPEFloatingPointException(struct pt_regs *regs) |
| { |
| unsigned long spefscr; |
| int fpexc_mode; |
| int code = 0; |
| |
| spefscr = current->thread.spefscr; |
| fpexc_mode = current->thread.fpexc_mode; |
| |
| /* Hardware does not neccessarily set sticky |
| * underflow/overflow/invalid flags */ |
| if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) { |
| code = FPE_FLTOVF; |
| spefscr |= SPEFSCR_FOVFS; |
| } |
| else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) { |
| code = FPE_FLTUND; |
| spefscr |= SPEFSCR_FUNFS; |
| } |
| else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV)) |
| code = FPE_FLTDIV; |
| else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) { |
| code = FPE_FLTINV; |
| spefscr |= SPEFSCR_FINVS; |
| } |
| else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES)) |
| code = FPE_FLTRES; |
| |
| current->thread.spefscr = spefscr; |
| |
| _exception(SIGFPE, regs, code, regs->nip); |
| return; |
| } |
| #endif |
| |
| /* |
| * 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); |
| } |
| |
| #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 |
| |
| /* |
| * 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) |
| { |
| } |