Release 4.14 arch/microblaze/kernel/exceptions.c
/*
* HW exception handling
*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008 PetaLogix
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*/
/*
* This file handles the architecture-dependent parts of hardware exceptions
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/kallsyms.h>
#include <asm/exceptions.h>
#include <asm/entry.h> /* For KM CPU var */
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <asm/current.h>
#include <asm/cacheflush.h>
#define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02
#define MICROBLAZE_IBUS_EXCEPTION 0x03
#define MICROBLAZE_DBUS_EXCEPTION 0x04
#define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05
#define MICROBLAZE_FPU_EXCEPTION 0x06
#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07
static DEFINE_SPINLOCK(die_lock);
void die(const char *str, struct pt_regs *fp, long err)
{
console_verbose();
spin_lock_irq(&die_lock);
pr_warn("Oops: %s, sig: %ld\n", str, err);
show_regs(fp);
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michal Simek | 53 | 100.00% | 2 | 100.00% |
| Total | 53 | 100.00% | 2 | 100.00% |
/* for user application debugging */
asmlinkage void sw_exception(struct pt_regs *regs)
{
_exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16);
flush_dcache_range(regs->r16, regs->r16 + 0x4);
flush_icache_range(regs->r16, regs->r16 + 0x4);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michal Simek | 50 | 100.00% | 3 | 100.00% |
| Total | 50 | 100.00% | 3 | 100.00% |
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
{
siginfo_t info;
if (kernel_mode(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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michal Simek | 78 | 100.00% | 1 | 100.00% |
| Total | 78 | 100.00% | 1 | 100.00% |
asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
int fsr, int addr)
{
#ifdef CONFIG_MMU
addr = regs->pc;
#endif
#if 0
pr_warn("Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n",
type, user_mode(regs) ? "user" : "kernel", fsr,
(unsigned int) regs->pc, (unsigned int) regs->esr);
#endif
switch (type & 0x1F) {
case MICROBLAZE_ILL_OPCODE_EXCEPTION:
if (user_mode(regs)) {
pr_debug("Illegal opcode exception in user mode\n");
_exception(SIGILL, regs, ILL_ILLOPC, addr);
return;
}
pr_warn("Illegal opcode exception in kernel mode.\n");
die("opcode exception", regs, SIGBUS);
break;
case MICROBLAZE_IBUS_EXCEPTION:
if (user_mode(regs)) {
pr_debug("Instruction bus error exception in user mode\n");
_exception(SIGBUS, regs, BUS_ADRERR, addr);
return;
}
pr_warn("Instruction bus error exception in kernel mode.\n");
die("bus exception", regs, SIGBUS);
break;
case MICROBLAZE_DBUS_EXCEPTION:
if (user_mode(regs)) {
pr_debug("Data bus error exception in user mode\n");
_exception(SIGBUS, regs, BUS_ADRERR, addr);
return;
}
pr_warn("Data bus error exception in kernel mode.\n");
die("bus exception", regs, SIGBUS);
break;
case MICROBLAZE_DIV_ZERO_EXCEPTION:
if (user_mode(regs)) {
pr_debug("Divide by zero exception in user mode\n");
_exception(SIGFPE, regs, FPE_INTDIV, addr);
return;
}
pr_warn("Divide by zero exception in kernel mode.\n");
die("Divide by zero exception", regs, SIGBUS);
break;
case MICROBLAZE_FPU_EXCEPTION:
pr_debug("FPU exception\n");
/* IEEE FP exception */
/* I removed fsr variable and use code var for storing fsr */
if (fsr & FSR_IO)
fsr = FPE_FLTINV;
else if (fsr & FSR_OF)
fsr = FPE_FLTOVF;
else if (fsr & FSR_UF)
fsr = FPE_FLTUND;
else if (fsr & FSR_DZ)
fsr = FPE_FLTDIV;
else if (fsr & FSR_DO)
fsr = FPE_FLTRES;
_exception(SIGFPE, regs, fsr, addr);
break;
#ifdef CONFIG_MMU
case MICROBLAZE_PRIVILEGED_EXCEPTION:
pr_debug("Privileged exception\n");
_exception(SIGILL, regs, ILL_PRVOPC, addr);
break;
#endif
default:
/* FIXME what to do in unexpected exception */
pr_warn("Unexpected exception %02x PC=%08x in %s mode\n",
type, (unsigned int) addr,
kernel_mode(regs) ? "kernel" : "user");
}
return;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michal Simek | 342 | 98.28% | 5 | 62.50% |
| Joe Perches | 4 | 1.15% | 1 | 12.50% |
| Randy Dunlap | 1 | 0.29% | 1 | 12.50% |
| Edgar E. Iglesias | 1 | 0.29% | 1 | 12.50% |
| Total | 348 | 100.00% | 8 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michal Simek | 593 | 98.50% | 9 | 69.23% |
| Joe Perches | 4 | 0.66% | 1 | 7.69% |
| Ingo Molnar | 3 | 0.50% | 1 | 7.69% |
| Randy Dunlap | 1 | 0.17% | 1 | 7.69% |
| Edgar E. Iglesias | 1 | 0.17% | 1 | 7.69% |
| Total | 602 | 100.00% | 13 | 100.00% |
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