mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
6f467986cf
Filling in struct siginfo before calling force_sig_info a tedious and error prone process, where once in a great while the wrong fields are filled out, and siginfo has been inconsistently cleared. Simplify this process by using the helper force_sig_fault. Which takes as a parameters all of the information it needs, ensures all of the fiddly bits of filling in struct siginfo are done properly and then calls force_sig_info. In short about a 5 line reduction in code for every time force_sig_info is called, which makes the calling function clearer. Cc: Michal Simek <monstr@monstr.eu> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
150 lines
4.0 KiB
C
150 lines
4.0 KiB
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);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
|
|
{
|
|
if (kernel_mode(regs))
|
|
die("Exception in kernel mode", regs, signr);
|
|
|
|
force_sig_fault(signr, code, (void __user *)addr, current);
|
|
}
|
|
|
|
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;
|
|
}
|