diff options
Diffstat (limited to 'arch/ia64/kernel/traps.c')
| -rw-r--r-- | arch/ia64/kernel/traps.c | 612 |
1 files changed, 0 insertions, 612 deletions
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c deleted file mode 100644 index e13cb905930f..000000000000 --- a/arch/ia64/kernel/traps.c +++ /dev/null @@ -1,612 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Architecture-specific trap handling. - * - * Copyright (C) 1998-2003 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - * - * 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/sched/signal.h> -#include <linux/sched/debug.h> -#include <linux/tty.h> -#include <linux/vt_kern.h> /* For unblank_screen() */ -#include <linux/export.h> -#include <linux/extable.h> -#include <linux/hardirq.h> -#include <linux/kprobes.h> -#include <linux/delay.h> /* for ssleep() */ -#include <linux/kdebug.h> -#include <linux/uaccess.h> - -#include <asm/fpswa.h> -#include <asm/intrinsics.h> -#include <asm/processor.h> -#include <asm/exception.h> -#include <asm/setup.h> - -fpswa_interface_t *fpswa_interface; -EXPORT_SYMBOL(fpswa_interface); - -void __init -trap_init (void) -{ - if (ia64_boot_param->fpswa) - /* FPSWA fixup: make the interface pointer a kernel virtual address: */ - fpswa_interface = __va(ia64_boot_param->fpswa); -} - -int -die (const char *str, struct pt_regs *regs, long err) -{ - static struct { - spinlock_t lock; - u32 lock_owner; - int lock_owner_depth; - } die = { - .lock = __SPIN_LOCK_UNLOCKED(die.lock), - .lock_owner = -1, - .lock_owner_depth = 0 - }; - static int die_counter; - int cpu = get_cpu(); - - if (die.lock_owner != cpu) { - console_verbose(); - spin_lock_irq(&die.lock); - die.lock_owner = cpu; - die.lock_owner_depth = 0; - bust_spinlocks(1); - } - put_cpu(); - - if (++die.lock_owner_depth < 3) { - printk("%s[%d]: %s %ld [%d]\n", - current->comm, task_pid_nr(current), str, err, ++die_counter); - if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV) - != NOTIFY_STOP) - show_regs(regs); - else - regs = NULL; - } else - printk(KERN_ERR "Recursive die() failure, output suppressed\n"); - - bust_spinlocks(0); - die.lock_owner = -1; - add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); - spin_unlock_irq(&die.lock); - - if (!regs) - return 1; - - if (panic_on_oops) - panic("Fatal exception"); - - do_exit(SIGSEGV); - return 0; -} - -int -die_if_kernel (char *str, struct pt_regs *regs, long err) -{ - if (!user_mode(regs)) - return die(str, regs, err); - return 0; -} - -void -__kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs) -{ - int sig, code; - - switch (break_num) { - case 0: /* unknown error (used by GCC for __builtin_abort()) */ - if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP) - == NOTIFY_STOP) - return; - if (die_if_kernel("bugcheck!", regs, break_num)) - return; - sig = SIGILL; code = ILL_ILLOPC; - break; - - case 1: /* integer divide by zero */ - sig = SIGFPE; code = FPE_INTDIV; - break; - - case 2: /* integer overflow */ - sig = SIGFPE; code = FPE_INTOVF; - break; - - case 3: /* range check/bounds check */ - sig = SIGFPE; code = FPE_FLTSUB; - break; - - case 4: /* null pointer dereference */ - sig = SIGSEGV; code = SEGV_MAPERR; - break; - - case 5: /* misaligned data */ - sig = SIGSEGV; code = BUS_ADRALN; - break; - - case 6: /* decimal overflow */ - sig = SIGFPE; code = __FPE_DECOVF; - break; - - case 7: /* decimal divide by zero */ - sig = SIGFPE; code = __FPE_DECDIV; - break; - - case 8: /* packed decimal error */ - sig = SIGFPE; code = __FPE_DECERR; - break; - - case 9: /* invalid ASCII digit */ - sig = SIGFPE; code = __FPE_INVASC; - break; - - case 10: /* invalid decimal digit */ - sig = SIGFPE; code = __FPE_INVDEC; - break; - - case 11: /* paragraph stack overflow */ - sig = SIGSEGV; code = __SEGV_PSTKOVF; - break; - - case 0x3f000 ... 0x3ffff: /* bundle-update in progress */ - sig = SIGILL; code = __ILL_BNDMOD; - break; - - default: - if ((break_num < 0x40000 || break_num > 0x100000) - && die_if_kernel("Bad break", regs, break_num)) - return; - - if (break_num < 0x80000) { - sig = SIGILL; code = __ILL_BREAK; - } else { - if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP) - == NOTIFY_STOP) - return; - sig = SIGTRAP; code = TRAP_BRKPT; - } - } - force_sig_fault(sig, code, - (void __user *) (regs->cr_iip + ia64_psr(regs)->ri), - break_num, 0 /* clear __ISR_VALID */, 0); -} - -/* - * disabled_fph_fault() is called when a user-level process attempts to access f32..f127 - * and it doesn't own the fp-high register partition. When this happens, we save the - * current fph partition in the task_struct of the fpu-owner (if necessary) and then load - * the fp-high partition of the current task (if necessary). Note that the kernel has - * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes - * care of clearing psr.dfh. - */ -static inline void -disabled_fph_fault (struct pt_regs *regs) -{ - struct ia64_psr *psr = ia64_psr(regs); - - /* first, grant user-level access to fph partition: */ - psr->dfh = 0; - - /* - * Make sure that no other task gets in on this processor - * while we're claiming the FPU - */ - preempt_disable(); -#ifndef CONFIG_SMP - { - struct task_struct *fpu_owner - = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER); - - if (ia64_is_local_fpu_owner(current)) { - preempt_enable_no_resched(); - return; - } - - if (fpu_owner) - ia64_flush_fph(fpu_owner); - } -#endif /* !CONFIG_SMP */ - ia64_set_local_fpu_owner(current); - if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) { - __ia64_load_fpu(current->thread.fph); - psr->mfh = 0; - } else { - __ia64_init_fpu(); - /* - * Set mfh because the state in thread.fph does not match the state in - * the fph partition. - */ - psr->mfh = 1; - } - preempt_enable_no_resched(); -} - -static inline int -fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs, - struct pt_regs *regs) -{ - fp_state_t fp_state; - fpswa_ret_t ret; - - if (!fpswa_interface) - return -1; - - memset(&fp_state, 0, sizeof(fp_state_t)); - - /* - * compute fp_state. only FP registers f6 - f11 are used by the - * kernel, so set those bits in the mask and set the low volatile - * pointer to point to these registers. - */ - fp_state.bitmask_low64 = 0xfc0; /* bit6..bit11 */ - - fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) ®s->f6; - /* - * unsigned long (*EFI_FPSWA) ( - * unsigned long trap_type, - * void *Bundle, - * unsigned long *pipsr, - * unsigned long *pfsr, - * unsigned long *pisr, - * unsigned long *ppreds, - * unsigned long *pifs, - * void *fp_state); - */ - ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle, - (unsigned long *) ipsr, (unsigned long *) fpsr, - (unsigned long *) isr, (unsigned long *) pr, - (unsigned long *) ifs, &fp_state); - - return ret.status; -} - -struct fpu_swa_msg { - unsigned long count; - unsigned long time; -}; -static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast); -DECLARE_PER_CPU(struct fpu_swa_msg, cpulast); -static struct fpu_swa_msg last __cacheline_aligned; - - -/* - * Handle floating-point assist faults and traps. - */ -static int -handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr) -{ - long exception, bundle[2]; - unsigned long fault_ip; - - fault_ip = regs->cr_iip; - if (!fp_fault && (ia64_psr(regs)->ri == 0)) - fault_ip -= 16; - if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle))) - return -1; - - if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) { - unsigned long count, current_jiffies = jiffies; - struct fpu_swa_msg *cp = this_cpu_ptr(&cpulast); - - if (unlikely(current_jiffies > cp->time)) - cp->count = 0; - if (unlikely(cp->count < 5)) { - cp->count++; - cp->time = current_jiffies + 5 * HZ; - - /* minimize races by grabbing a copy of count BEFORE checking last.time. */ - count = last.count; - barrier(); - - /* - * Lower 4 bits are used as a count. Upper bits are a sequence - * number that is updated when count is reset. The cmpxchg will - * fail is seqno has changed. This minimizes mutiple cpus - * resetting the count. - */ - if (current_jiffies > last.time) - (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15)); - - /* used fetchadd to atomically update the count */ - if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) { - last.time = current_jiffies + 5 * HZ; - printk(KERN_WARNING - "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n", - current->comm, task_pid_nr(current), regs->cr_iip + ia64_psr(regs)->ri, isr); - } - } - } - - exception = fp_emulate(fp_fault, bundle, ®s->cr_ipsr, ®s->ar_fpsr, &isr, ®s->pr, - ®s->cr_ifs, regs); - if (fp_fault) { - if (exception == 0) { - /* emulation was successful */ - ia64_increment_ip(regs); - } else if (exception == -1) { - printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n"); - return -1; - } else { - /* is next instruction a trap? */ - int si_code; - - if (exception & 2) { - ia64_increment_ip(regs); - } - si_code = FPE_FLTUNK; /* default code */ - if (isr & 0x11) { - si_code = FPE_FLTINV; - } else if (isr & 0x22) { - /* denormal operand gets the same si_code as underflow - * see arch/i386/kernel/traps.c:math_error() */ - si_code = FPE_FLTUND; - } else if (isr & 0x44) { - si_code = FPE_FLTDIV; - } - force_sig_fault(SIGFPE, si_code, - (void __user *) (regs->cr_iip + ia64_psr(regs)->ri), - 0, __ISR_VALID, isr); - } - } else { - if (exception == -1) { - printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n"); - return -1; - } else if (exception != 0) { - /* raise exception */ - int si_code; - - si_code = FPE_FLTUNK; /* default code */ - if (isr & 0x880) { - si_code = FPE_FLTOVF; - } else if (isr & 0x1100) { - si_code = FPE_FLTUND; - } else if (isr & 0x2200) { - si_code = FPE_FLTRES; - } - force_sig_fault(SIGFPE, si_code, - (void __user *) (regs->cr_iip + ia64_psr(regs)->ri), - 0, __ISR_VALID, isr); - } - } - return 0; -} - -struct illegal_op_return { - unsigned long fkt, arg1, arg2, arg3; -}; - -struct illegal_op_return -ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3, - long arg4, long arg5, long arg6, long arg7, - struct pt_regs regs) -{ - struct illegal_op_return rv; - char buf[128]; - -#ifdef CONFIG_IA64_BRL_EMU - { - extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long); - - rv = ia64_emulate_brl(®s, ec); - if (rv.fkt != (unsigned long) -1) - return rv; - } -#endif - - sprintf(buf, "IA-64 Illegal operation fault"); - rv.fkt = 0; - if (die_if_kernel(buf, ®s, 0)) - return rv; - - force_sig_fault(SIGILL, ILL_ILLOPC, - (void __user *) (regs.cr_iip + ia64_psr(®s)->ri), - 0, 0, 0); - return rv; -} - -void __kprobes -ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, - unsigned long iim, unsigned long itir, long arg5, long arg6, - long arg7, struct pt_regs regs) -{ - unsigned long code, error = isr, iip; - char buf[128]; - int result, sig, si_code; - static const char *reason[] = { - "IA-64 Illegal Operation fault", - "IA-64 Privileged Operation fault", - "IA-64 Privileged Register fault", - "IA-64 Reserved Register/Field fault", - "Disabled Instruction Set Transition fault", - "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault", - "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12", - "Unknown fault 13", "Unknown fault 14", "Unknown fault 15" - }; - - if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) { - /* - * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel - * the lfetch. - */ - ia64_psr(®s)->ed = 1; - return; - } - - iip = regs.cr_iip + ia64_psr(®s)->ri; - - switch (vector) { - case 24: /* General Exception */ - code = (isr >> 4) & 0xf; - sprintf(buf, "General Exception: %s%s", reason[code], - (code == 3) ? ((isr & (1UL << 37)) - ? " (RSE access)" : " (data access)") : ""); - if (code == 8) { -# ifdef CONFIG_IA64_PRINT_HAZARDS - printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n", - current->comm, task_pid_nr(current), - regs.cr_iip + ia64_psr(®s)->ri, regs.pr); -# endif - return; - } - break; - - case 25: /* Disabled FP-Register */ - if (isr & 2) { - disabled_fph_fault(®s); - return; - } - sprintf(buf, "Disabled FPL fault---not supposed to happen!"); - break; - - case 26: /* NaT Consumption */ - if (user_mode(®s)) { - void __user *addr; - - if (((isr >> 4) & 0xf) == 2) { - /* NaT page consumption */ - sig = SIGSEGV; - code = SEGV_ACCERR; - addr = (void __user *) ifa; - } else { - /* register NaT consumption */ - sig = SIGILL; - code = ILL_ILLOPN; - addr = (void __user *) (regs.cr_iip - + ia64_psr(®s)->ri); - } - force_sig_fault(sig, code, addr, - vector, __ISR_VALID, isr); - return; - } else if (ia64_done_with_exception(®s)) - return; - sprintf(buf, "NaT consumption"); - break; - - case 31: /* Unsupported Data Reference */ - if (user_mode(®s)) { - force_sig_fault(SIGILL, ILL_ILLOPN, (void __user *) iip, - vector, __ISR_VALID, isr); - return; - } - sprintf(buf, "Unsupported data reference"); - break; - - case 29: /* Debug */ - case 35: /* Taken Branch Trap */ - case 36: /* Single Step Trap */ - if (fsys_mode(current, ®s)) { - extern char __kernel_syscall_via_break[]; - /* - * Got a trap in fsys-mode: Taken Branch Trap - * and Single Step trap need special handling; - * Debug trap is ignored (we disable it here - * and re-enable it in the lower-privilege trap). - */ - if (unlikely(vector == 29)) { - set_thread_flag(TIF_DB_DISABLED); - ia64_psr(®s)->db = 0; - ia64_psr(®s)->lp = 1; - return; - } - /* re-do the system call via break 0x100000: */ - regs.cr_iip = (unsigned long) __kernel_syscall_via_break; - ia64_psr(®s)->ri = 0; - ia64_psr(®s)->cpl = 3; - return; - } - switch (vector) { - default: - case 29: - si_code = TRAP_HWBKPT; -#ifdef CONFIG_ITANIUM - /* - * Erratum 10 (IFA may contain incorrect address) now has - * "NoFix" status. There are no plans for fixing this. - */ - if (ia64_psr(®s)->is == 0) - ifa = regs.cr_iip; -#endif - break; - case 35: si_code = TRAP_BRANCH; ifa = 0; break; - case 36: si_code = TRAP_TRACE; ifa = 0; break; - } - if (notify_die(DIE_FAULT, "ia64_fault", ®s, vector, si_code, SIGTRAP) - == NOTIFY_STOP) - return; - force_sig_fault(SIGTRAP, si_code, (void __user *) ifa, - 0, __ISR_VALID, isr); - return; - - case 32: /* fp fault */ - case 33: /* fp trap */ - result = handle_fpu_swa((vector == 32) ? 1 : 0, ®s, isr); - if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) { - force_sig_fault(SIGFPE, FPE_FLTINV, (void __user *) iip, - 0, __ISR_VALID, isr); - } - return; - - case 34: - if (isr & 0x2) { - /* Lower-Privilege Transfer Trap */ - - /* If we disabled debug traps during an fsyscall, - * re-enable them here. - */ - if (test_thread_flag(TIF_DB_DISABLED)) { - clear_thread_flag(TIF_DB_DISABLED); - ia64_psr(®s)->db = 1; - } - - /* - * Just clear PSR.lp and then return immediately: - * all the interesting work (e.g., signal delivery) - * is done in the kernel exit path. - */ - ia64_psr(®s)->lp = 0; - return; - } else { - /* Unimplemented Instr. Address Trap */ - if (user_mode(®s)) { - force_sig_fault(SIGILL, ILL_BADIADDR, - (void __user *) iip, - 0, 0, 0); - return; - } - sprintf(buf, "Unimplemented Instruction Address fault"); - } - break; - - case 45: - printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n"); - printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n", - iip, ifa, isr); - force_sig(SIGSEGV); - return; - - case 46: - printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n"); - printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n", - iip, ifa, isr, iim); - force_sig(SIGSEGV); - return; - - case 47: - sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16); - break; - - default: - sprintf(buf, "Fault %lu", vector); - break; - } - if (!die_if_kernel(buf, ®s, error)) - force_sig(SIGILL); -} |