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144 lines
4.0 KiB
144 lines
4.0 KiB
/* |
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* HW exception handling |
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* |
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* Copyright (C) 2008-2009 Michal Simek <[email protected]> |
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* Copyright (C) 2008 PetaLogix |
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* |
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* This file is subject to the terms and conditions of the GNU General |
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* Public License. See the file COPYING in the main directory of this |
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* archive for more details. |
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*/ |
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/* |
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* This file handles the architecture-dependent parts of hardware exceptions |
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*/ |
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/kallsyms.h> |
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#include <asm/exceptions.h> |
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#include <asm/entry.h> /* For KM CPU var */ |
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#include <linux/uaccess.h> |
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#include <linux/errno.h> |
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#include <linux/ptrace.h> |
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#include <asm/current.h> |
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#include <asm/cacheflush.h> |
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#define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02 |
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#define MICROBLAZE_IBUS_EXCEPTION 0x03 |
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#define MICROBLAZE_DBUS_EXCEPTION 0x04 |
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#define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05 |
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#define MICROBLAZE_FPU_EXCEPTION 0x06 |
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#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07 |
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static DEFINE_SPINLOCK(die_lock); |
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void die(const char *str, struct pt_regs *fp, long err) |
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{ |
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console_verbose(); |
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spin_lock_irq(&die_lock); |
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pr_warn("Oops: %s, sig: %ld\n", str, err); |
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show_regs(fp); |
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spin_unlock_irq(&die_lock); |
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/* do_exit() should take care of panic'ing from an interrupt |
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* context so we don't handle it here |
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*/ |
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do_exit(err); |
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} |
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/* for user application debugging */ |
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asmlinkage void sw_exception(struct pt_regs *regs) |
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{ |
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_exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16); |
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flush_dcache_range(regs->r16, regs->r16 + 0x4); |
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flush_icache_range(regs->r16, regs->r16 + 0x4); |
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} |
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void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) |
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{ |
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if (kernel_mode(regs)) |
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die("Exception in kernel mode", regs, signr); |
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force_sig_fault(signr, code, (void __user *)addr); |
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} |
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asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, |
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int fsr, int addr) |
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{ |
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addr = regs->pc; |
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#if 0 |
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pr_warn("Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n", |
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type, user_mode(regs) ? "user" : "kernel", fsr, |
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(unsigned int) regs->pc, (unsigned int) regs->esr); |
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#endif |
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switch (type & 0x1F) { |
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case MICROBLAZE_ILL_OPCODE_EXCEPTION: |
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if (user_mode(regs)) { |
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pr_debug("Illegal opcode exception in user mode\n"); |
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_exception(SIGILL, regs, ILL_ILLOPC, addr); |
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return; |
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} |
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pr_warn("Illegal opcode exception in kernel mode.\n"); |
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die("opcode exception", regs, SIGBUS); |
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break; |
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case MICROBLAZE_IBUS_EXCEPTION: |
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if (user_mode(regs)) { |
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pr_debug("Instruction bus error exception in user mode\n"); |
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_exception(SIGBUS, regs, BUS_ADRERR, addr); |
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return; |
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} |
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pr_warn("Instruction bus error exception in kernel mode.\n"); |
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die("bus exception", regs, SIGBUS); |
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break; |
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case MICROBLAZE_DBUS_EXCEPTION: |
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if (user_mode(regs)) { |
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pr_debug("Data bus error exception in user mode\n"); |
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_exception(SIGBUS, regs, BUS_ADRERR, addr); |
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return; |
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} |
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pr_warn("Data bus error exception in kernel mode.\n"); |
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die("bus exception", regs, SIGBUS); |
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break; |
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case MICROBLAZE_DIV_ZERO_EXCEPTION: |
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if (user_mode(regs)) { |
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pr_debug("Divide by zero exception in user mode\n"); |
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_exception(SIGFPE, regs, FPE_INTDIV, addr); |
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return; |
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} |
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pr_warn("Divide by zero exception in kernel mode.\n"); |
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die("Divide by zero exception", regs, SIGBUS); |
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break; |
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case MICROBLAZE_FPU_EXCEPTION: |
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pr_debug("FPU exception\n"); |
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/* IEEE FP exception */ |
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/* I removed fsr variable and use code var for storing fsr */ |
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if (fsr & FSR_IO) |
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fsr = FPE_FLTINV; |
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else if (fsr & FSR_OF) |
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fsr = FPE_FLTOVF; |
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else if (fsr & FSR_UF) |
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fsr = FPE_FLTUND; |
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else if (fsr & FSR_DZ) |
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fsr = FPE_FLTDIV; |
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else if (fsr & FSR_DO) |
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fsr = FPE_FLTRES; |
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_exception(SIGFPE, regs, fsr, addr); |
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break; |
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case MICROBLAZE_PRIVILEGED_EXCEPTION: |
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pr_debug("Privileged exception\n"); |
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_exception(SIGILL, regs, ILL_PRVOPC, addr); |
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break; |
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default: |
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/* FIXME what to do in unexpected exception */ |
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pr_warn("Unexpected exception %02x PC=%08x in %s mode\n", |
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type, (unsigned int) addr, |
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kernel_mode(regs) ? "kernel" : "user"); |
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} |
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return; |
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}
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