643 lines
14 KiB
C
643 lines
14 KiB
C
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/* traps.c: high-level exception handler for FR-V
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*
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* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched/signal.h>
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#include <linux/sched/debug.h>
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#include <linux/signal.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <linux/user.h>
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#include <linux/string.h>
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/asm-offsets.h>
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#include <asm/setup.h>
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#include <asm/fpu.h>
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#include <linux/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/siginfo.h>
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#include <asm/unaligned.h>
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void show_backtrace(struct pt_regs *, unsigned long);
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extern asmlinkage void __break_hijack_kernel_event(void);
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/*****************************************************************************/
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/*
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* instruction access error
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*/
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asmlinkage void insn_access_error(unsigned long esfr1, unsigned long epcr0, unsigned long esr0)
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{
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siginfo_t info;
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die_if_kernel("-- Insn Access Error --\n"
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"EPCR0 : %08lx\n"
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"ESR0 : %08lx\n",
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epcr0, esr0);
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info.si_signo = SIGSEGV;
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info.si_code = SEGV_ACCERR;
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info.si_errno = 0;
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info.si_addr = (void __user *) ((epcr0 & EPCR0_V) ? (epcr0 & EPCR0_PC) : __frame->pc);
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force_sig_info(info.si_signo, &info, current);
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} /* end insn_access_error() */
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/*****************************************************************************/
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/*
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* handler for:
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* - illegal instruction
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* - privileged instruction
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* - unsupported trap
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* - debug exceptions
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*/
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asmlinkage void illegal_instruction(unsigned long esfr1, unsigned long epcr0, unsigned long esr0)
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{
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siginfo_t info;
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die_if_kernel("-- Illegal Instruction --\n"
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"EPCR0 : %08lx\n"
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"ESR0 : %08lx\n"
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"ESFR1 : %08lx\n",
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epcr0, esr0, esfr1);
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info.si_errno = 0;
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info.si_addr = (void __user *) ((epcr0 & EPCR0_V) ? (epcr0 & EPCR0_PC) : __frame->pc);
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switch (__frame->tbr & TBR_TT) {
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case TBR_TT_ILLEGAL_INSTR:
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info.si_signo = SIGILL;
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info.si_code = ILL_ILLOPC;
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break;
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case TBR_TT_PRIV_INSTR:
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info.si_signo = SIGILL;
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info.si_code = ILL_PRVOPC;
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break;
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case TBR_TT_TRAP2 ... TBR_TT_TRAP126:
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info.si_signo = SIGILL;
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info.si_code = ILL_ILLTRP;
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break;
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/* GDB uses "tira gr0, #1" as a breakpoint instruction. */
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case TBR_TT_TRAP1:
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case TBR_TT_BREAK:
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info.si_signo = SIGTRAP;
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info.si_code =
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(__frame->__status & REG__STATUS_STEPPED) ? TRAP_TRACE : TRAP_BRKPT;
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break;
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}
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force_sig_info(info.si_signo, &info, current);
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} /* end illegal_instruction() */
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/*****************************************************************************/
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/*
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* handle atomic operations with errors
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* - arguments in gr8, gr9, gr10
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* - original memory value placed in gr5
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* - replacement memory value placed in gr9
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*/
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asmlinkage void atomic_operation(unsigned long esfr1, unsigned long epcr0,
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unsigned long esr0)
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{
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static DEFINE_SPINLOCK(atomic_op_lock);
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unsigned long x, y, z;
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unsigned long __user *p;
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mm_segment_t oldfs;
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siginfo_t info;
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int ret;
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y = 0;
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z = 0;
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oldfs = get_fs();
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if (!user_mode(__frame))
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set_fs(KERNEL_DS);
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switch (__frame->tbr & TBR_TT) {
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/* TIRA gr0,#120
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* u32 __atomic_user_cmpxchg32(u32 *ptr, u32 test, u32 new)
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*/
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case TBR_TT_ATOMIC_CMPXCHG32:
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p = (unsigned long __user *) __frame->gr8;
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x = __frame->gr9;
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y = __frame->gr10;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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if (z != x)
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goto done;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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if (z != x)
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goto done2;
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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/* TIRA gr0,#121
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* u32 __atomic_kernel_xchg32(void *v, u32 new)
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*/
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case TBR_TT_ATOMIC_XCHG32:
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p = (unsigned long __user *) __frame->gr8;
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y = __frame->gr9;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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/* TIRA gr0,#122
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* ulong __atomic_kernel_XOR_return(ulong i, ulong *v)
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*/
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case TBR_TT_ATOMIC_XOR:
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p = (unsigned long __user *) __frame->gr8;
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x = __frame->gr9;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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y = x ^ z;
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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/* TIRA gr0,#123
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* ulong __atomic_kernel_OR_return(ulong i, ulong *v)
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*/
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case TBR_TT_ATOMIC_OR:
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p = (unsigned long __user *) __frame->gr8;
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x = __frame->gr9;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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y = x ^ z;
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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/* TIRA gr0,#124
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* ulong __atomic_kernel_AND_return(ulong i, ulong *v)
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*/
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case TBR_TT_ATOMIC_AND:
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p = (unsigned long __user *) __frame->gr8;
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x = __frame->gr9;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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y = x & z;
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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/* TIRA gr0,#125
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* int __atomic_user_sub_return(atomic_t *v, int i)
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*/
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case TBR_TT_ATOMIC_SUB:
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p = (unsigned long __user *) __frame->gr8;
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x = __frame->gr9;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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y = z - x;
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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/* TIRA gr0,#126
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* int __atomic_user_add_return(atomic_t *v, int i)
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*/
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case TBR_TT_ATOMIC_ADD:
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p = (unsigned long __user *) __frame->gr8;
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x = __frame->gr9;
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for (;;) {
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ret = get_user(z, p);
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if (ret < 0)
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goto error;
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spin_lock_irq(&atomic_op_lock);
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if (__get_user(z, p) == 0) {
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y = z + x;
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if (__put_user(y, p) == 0)
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goto done2;
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goto error2;
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}
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spin_unlock_irq(&atomic_op_lock);
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}
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default:
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BUG();
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}
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done2:
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spin_unlock_irq(&atomic_op_lock);
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done:
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if (!user_mode(__frame))
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set_fs(oldfs);
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__frame->gr5 = z;
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__frame->gr9 = y;
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return;
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error2:
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spin_unlock_irq(&atomic_op_lock);
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error:
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if (!user_mode(__frame))
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set_fs(oldfs);
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__frame->pc -= 4;
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die_if_kernel("-- Atomic Op Error --\n");
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info.si_signo = SIGSEGV;
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info.si_code = SEGV_ACCERR;
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info.si_errno = 0;
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info.si_addr = (void __user *) __frame->pc;
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force_sig_info(info.si_signo, &info, current);
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}
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/*****************************************************************************/
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/*
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*
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*/
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asmlinkage void media_exception(unsigned long msr0, unsigned long msr1)
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{
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siginfo_t info;
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die_if_kernel("-- Media Exception --\n"
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"MSR0 : %08lx\n"
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"MSR1 : %08lx\n",
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msr0, msr1);
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info.si_signo = SIGFPE;
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info.si_code = FPE_MDAOVF;
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info.si_errno = 0;
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info.si_addr = (void __user *) __frame->pc;
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force_sig_info(info.si_signo, &info, current);
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} /* end media_exception() */
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/*****************************************************************************/
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/*
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* instruction or data access exception
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*/
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asmlinkage void memory_access_exception(unsigned long esr0,
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unsigned long ear0,
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unsigned long epcr0)
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{
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siginfo_t info;
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#ifdef CONFIG_MMU
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if (fixup_exception(__frame))
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return;
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#endif
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die_if_kernel("-- Memory Access Exception --\n"
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"ESR0 : %08lx\n"
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"EAR0 : %08lx\n"
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"EPCR0 : %08lx\n",
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esr0, ear0, epcr0);
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info.si_signo = SIGSEGV;
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info.si_code = SEGV_ACCERR;
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info.si_errno = 0;
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info.si_addr = NULL;
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if ((esr0 & (ESRx_VALID | ESR0_EAV)) == (ESRx_VALID | ESR0_EAV))
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info.si_addr = (void __user *) ear0;
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force_sig_info(info.si_signo, &info, current);
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} /* end memory_access_exception() */
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/*****************************************************************************/
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/*
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* data access error
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* - double-word data load from CPU control area (0xFExxxxxx)
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* - read performed on inactive or self-refreshing SDRAM
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* - error notification from slave device
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* - misaligned address
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* - access to out of bounds memory region
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|
* - user mode accessing privileged memory region
|
||
|
|
* - write to R/O memory region
|
||
|
|
*/
|
||
|
|
asmlinkage void data_access_error(unsigned long esfr1, unsigned long esr15, unsigned long ear15)
|
||
|
|
{
|
||
|
|
siginfo_t info;
|
||
|
|
|
||
|
|
die_if_kernel("-- Data Access Error --\n"
|
||
|
|
"ESR15 : %08lx\n"
|
||
|
|
"EAR15 : %08lx\n",
|
||
|
|
esr15, ear15);
|
||
|
|
|
||
|
|
info.si_signo = SIGSEGV;
|
||
|
|
info.si_code = SEGV_ACCERR;
|
||
|
|
info.si_errno = 0;
|
||
|
|
info.si_addr = (void __user *)
|
||
|
|
(((esr15 & (ESRx_VALID|ESR15_EAV)) == (ESRx_VALID|ESR15_EAV)) ? ear15 : 0);
|
||
|
|
|
||
|
|
force_sig_info(info.si_signo, &info, current);
|
||
|
|
} /* end data_access_error() */
|
||
|
|
|
||
|
|
/*****************************************************************************/
|
||
|
|
/*
|
||
|
|
* data store error - should only happen if accessing inactive or self-refreshing SDRAM
|
||
|
|
*/
|
||
|
|
asmlinkage void data_store_error(unsigned long esfr1, unsigned long esr15)
|
||
|
|
{
|
||
|
|
die_if_kernel("-- Data Store Error --\n"
|
||
|
|
"ESR15 : %08lx\n",
|
||
|
|
esr15);
|
||
|
|
BUG();
|
||
|
|
} /* end data_store_error() */
|
||
|
|
|
||
|
|
/*****************************************************************************/
|
||
|
|
/*
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
asmlinkage void division_exception(unsigned long esfr1, unsigned long esr0, unsigned long isr)
|
||
|
|
{
|
||
|
|
siginfo_t info;
|
||
|
|
|
||
|
|
die_if_kernel("-- Division Exception --\n"
|
||
|
|
"ESR0 : %08lx\n"
|
||
|
|
"ISR : %08lx\n",
|
||
|
|
esr0, isr);
|
||
|
|
|
||
|
|
info.si_signo = SIGFPE;
|
||
|
|
info.si_code = FPE_INTDIV;
|
||
|
|
info.si_errno = 0;
|
||
|
|
info.si_addr = (void __user *) __frame->pc;
|
||
|
|
|
||
|
|
force_sig_info(info.si_signo, &info, current);
|
||
|
|
} /* end division_exception() */
|
||
|
|
|
||
|
|
/*****************************************************************************/
|
||
|
|
/*
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
asmlinkage void compound_exception(unsigned long esfr1,
|
||
|
|
unsigned long esr0, unsigned long esr14, unsigned long esr15,
|
||
|
|
unsigned long msr0, unsigned long msr1)
|
||
|
|
{
|
||
|
|
die_if_kernel("-- Compound Exception --\n"
|
||
|
|
"ESR0 : %08lx\n"
|
||
|
|
"ESR15 : %08lx\n"
|
||
|
|
"ESR15 : %08lx\n"
|
||
|
|
"MSR0 : %08lx\n"
|
||
|
|
"MSR1 : %08lx\n",
|
||
|
|
esr0, esr14, esr15, msr0, msr1);
|
||
|
|
BUG();
|
||
|
|
} /* end compound_exception() */
|
||
|
|
|
||
|
|
void show_stack(struct task_struct *task, unsigned long *sp)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
void show_trace_task(struct task_struct *tsk)
|
||
|
|
{
|
||
|
|
printk("CONTEXT: stack=0x%lx frame=0x%p LR=0x%lx RET=0x%lx\n",
|
||
|
|
tsk->thread.sp, tsk->thread.frame, tsk->thread.lr, tsk->thread.sched_lr);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const char *regnames[] = {
|
||
|
|
"PSR ", "ISR ", "CCR ", "CCCR",
|
||
|
|
"LR ", "LCR ", "PC ", "_stt",
|
||
|
|
"sys ", "GR8*", "GNE0", "GNE1",
|
||
|
|
"IACH", "IACL",
|
||
|
|
"TBR ", "SP ", "FP ", "GR3 ",
|
||
|
|
"GR4 ", "GR5 ", "GR6 ", "GR7 ",
|
||
|
|
"GR8 ", "GR9 ", "GR10", "GR11",
|
||
|
|
"GR12", "GR13", "GR14", "GR15",
|
||
|
|
"GR16", "GR17", "GR18", "GR19",
|
||
|
|
"GR20", "GR21", "GR22", "GR23",
|
||
|
|
"GR24", "GR25", "GR26", "GR27",
|
||
|
|
"EFRM", "CURR", "GR30", "BFRM"
|
||
|
|
};
|
||
|
|
|
||
|
|
void show_regs(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
unsigned long *reg;
|
||
|
|
int loop;
|
||
|
|
|
||
|
|
printk("\n");
|
||
|
|
show_regs_print_info(KERN_DEFAULT);
|
||
|
|
|
||
|
|
printk("Frame: @%08lx [%s]\n",
|
||
|
|
(unsigned long) regs,
|
||
|
|
regs->psr & PSR_S ? "kernel" : "user");
|
||
|
|
|
||
|
|
reg = (unsigned long *) regs;
|
||
|
|
for (loop = 0; loop < NR_PT_REGS; loop++) {
|
||
|
|
printk("%s %08lx", regnames[loop + 0], reg[loop + 0]);
|
||
|
|
|
||
|
|
if (loop == NR_PT_REGS - 1 || loop % 5 == 4)
|
||
|
|
printk("\n");
|
||
|
|
else
|
||
|
|
printk(" | ");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void die_if_kernel(const char *str, ...)
|
||
|
|
{
|
||
|
|
char buffer[256];
|
||
|
|
va_list va;
|
||
|
|
|
||
|
|
if (user_mode(__frame))
|
||
|
|
return;
|
||
|
|
|
||
|
|
va_start(va, str);
|
||
|
|
vsnprintf(buffer, sizeof(buffer), str, va);
|
||
|
|
va_end(va);
|
||
|
|
|
||
|
|
console_verbose();
|
||
|
|
printk("\n===================================\n");
|
||
|
|
printk("%s\n", buffer);
|
||
|
|
show_backtrace(__frame, 0);
|
||
|
|
|
||
|
|
__break_hijack_kernel_event();
|
||
|
|
do_exit(SIGSEGV);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*****************************************************************************/
|
||
|
|
/*
|
||
|
|
* dump the contents of an exception frame
|
||
|
|
*/
|
||
|
|
static void show_backtrace_regs(struct pt_regs *frame)
|
||
|
|
{
|
||
|
|
unsigned long *reg;
|
||
|
|
int loop;
|
||
|
|
|
||
|
|
/* print the registers for this frame */
|
||
|
|
printk("<-- %s Frame: @%p -->\n",
|
||
|
|
frame->psr & PSR_S ? "Kernel Mode" : "User Mode",
|
||
|
|
frame);
|
||
|
|
|
||
|
|
reg = (unsigned long *) frame;
|
||
|
|
for (loop = 0; loop < NR_PT_REGS; loop++) {
|
||
|
|
printk("%s %08lx", regnames[loop + 0], reg[loop + 0]);
|
||
|
|
|
||
|
|
if (loop == NR_PT_REGS - 1 || loop % 5 == 4)
|
||
|
|
printk("\n");
|
||
|
|
else
|
||
|
|
printk(" | ");
|
||
|
|
}
|
||
|
|
|
||
|
|
printk("--------\n");
|
||
|
|
} /* end show_backtrace_regs() */
|
||
|
|
|
||
|
|
/*****************************************************************************/
|
||
|
|
/*
|
||
|
|
* generate a backtrace of the kernel stack
|
||
|
|
*/
|
||
|
|
void show_backtrace(struct pt_regs *frame, unsigned long sp)
|
||
|
|
{
|
||
|
|
struct pt_regs *frame0;
|
||
|
|
unsigned long tos = 0, stop = 0, base;
|
||
|
|
int format;
|
||
|
|
|
||
|
|
base = ((((unsigned long) frame) + 8191) & ~8191) - sizeof(struct user_context);
|
||
|
|
frame0 = (struct pt_regs *) base;
|
||
|
|
|
||
|
|
if (sp) {
|
||
|
|
tos = sp;
|
||
|
|
stop = (unsigned long) frame;
|
||
|
|
}
|
||
|
|
|
||
|
|
printk("\nProcess %s (pid: %d)\n\n", current->comm, current->pid);
|
||
|
|
|
||
|
|
for (;;) {
|
||
|
|
/* dump stack segment between frames */
|
||
|
|
//printk("%08lx -> %08lx\n", tos, stop);
|
||
|
|
format = 0;
|
||
|
|
while (tos < stop) {
|
||
|
|
if (format == 0)
|
||
|
|
printk(" %04lx :", tos & 0xffff);
|
||
|
|
|
||
|
|
printk(" %08lx", *(unsigned long *) tos);
|
||
|
|
|
||
|
|
tos += 4;
|
||
|
|
format++;
|
||
|
|
if (format == 8) {
|
||
|
|
printk("\n");
|
||
|
|
format = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (format > 0)
|
||
|
|
printk("\n");
|
||
|
|
|
||
|
|
/* dump frame 0 outside of the loop */
|
||
|
|
if (frame == frame0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
tos = frame->sp;
|
||
|
|
if (((unsigned long) frame) + sizeof(*frame) != tos) {
|
||
|
|
printk("-- TOS %08lx does not follow frame %p --\n",
|
||
|
|
tos, frame);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
show_backtrace_regs(frame);
|
||
|
|
|
||
|
|
/* dump the stack between this frame and the next */
|
||
|
|
stop = (unsigned long) frame->next_frame;
|
||
|
|
if (stop != base &&
|
||
|
|
(stop < tos ||
|
||
|
|
stop > base ||
|
||
|
|
(stop < base && stop + sizeof(*frame) > base) ||
|
||
|
|
stop & 3)) {
|
||
|
|
printk("-- next_frame %08lx is invalid (range %08lx-%08lx) --\n",
|
||
|
|
stop, tos, base);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* move to next frame */
|
||
|
|
frame = frame->next_frame;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* we can always dump frame 0, even if the rest of the stack is corrupt */
|
||
|
|
show_backtrace_regs(frame0);
|
||
|
|
|
||
|
|
} /* end show_backtrace() */
|
||
|
|
|
||
|
|
/*****************************************************************************/
|
||
|
|
/*
|
||
|
|
* initialise traps
|
||
|
|
*/
|
||
|
|
void __init trap_init (void)
|
||
|
|
{
|
||
|
|
} /* end trap_init() */
|