2012-03-05 11:49:27 +00:00
|
|
|
/*
|
|
|
|
* Based on arch/arm/kernel/traps.c
|
|
|
|
*
|
|
|
|
* Copyright (C) 1995-2009 Russell King
|
|
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
|
2015-07-24 15:37:48 +00:00
|
|
|
#include <linux/bug.h>
|
2012-03-05 11:49:27 +00:00
|
|
|
#include <linux/signal.h>
|
|
|
|
#include <linux/personality.h>
|
|
|
|
#include <linux/kallsyms.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <linux/hardirq.h>
|
|
|
|
#include <linux/kdebug.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kexec.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/syscalls.h>
|
|
|
|
|
|
|
|
#include <asm/atomic.h>
|
2015-07-24 15:37:48 +00:00
|
|
|
#include <asm/bug.h>
|
2013-03-16 08:48:13 +00:00
|
|
|
#include <asm/debug-monitors.h>
|
2014-11-18 12:16:30 +00:00
|
|
|
#include <asm/esr.h>
|
2015-07-24 15:37:48 +00:00
|
|
|
#include <asm/insn.h>
|
2012-03-05 11:49:27 +00:00
|
|
|
#include <asm/traps.h>
|
|
|
|
#include <asm/stacktrace.h>
|
|
|
|
#include <asm/exception.h>
|
|
|
|
#include <asm/system_misc.h>
|
|
|
|
|
|
|
|
static const char *handler[]= {
|
|
|
|
"Synchronous Abort",
|
|
|
|
"IRQ",
|
|
|
|
"FIQ",
|
|
|
|
"Error"
|
|
|
|
};
|
|
|
|
|
|
|
|
int show_unhandled_signals = 1;
|
|
|
|
|
|
|
|
/*
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
* Dump out the contents of some kernel memory nicely...
|
2012-03-05 11:49:27 +00:00
|
|
|
*/
|
|
|
|
static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
unsigned long top)
|
2012-03-05 11:49:27 +00:00
|
|
|
{
|
|
|
|
unsigned long first;
|
|
|
|
mm_segment_t fs;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We need to switch to kernel mode so that we can use __get_user
|
2016-06-13 10:15:14 +00:00
|
|
|
* to safely read from kernel space.
|
2012-03-05 11:49:27 +00:00
|
|
|
*/
|
|
|
|
fs = get_fs();
|
|
|
|
set_fs(KERNEL_DS);
|
|
|
|
|
|
|
|
printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
|
|
|
|
|
|
|
|
for (first = bottom & ~31; first < top; first += 32) {
|
|
|
|
unsigned long p;
|
|
|
|
char str[sizeof(" 12345678") * 8 + 1];
|
|
|
|
|
|
|
|
memset(str, ' ', sizeof(str));
|
|
|
|
str[sizeof(str) - 1] = '\0';
|
|
|
|
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
for (p = first, i = 0; i < (32 / 8)
|
|
|
|
&& p < top; i++, p += 8) {
|
2012-03-05 11:49:27 +00:00
|
|
|
if (p >= bottom && p < top) {
|
2015-07-10 08:23:59 +00:00
|
|
|
unsigned long val;
|
|
|
|
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
if (__get_user(val, (unsigned long *)p) == 0)
|
|
|
|
sprintf(str + i * 17, " %016lx", val);
|
|
|
|
else
|
|
|
|
sprintf(str + i * 17, " ????????????????");
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
|
|
|
|
}
|
|
|
|
|
|
|
|
set_fs(fs);
|
|
|
|
}
|
|
|
|
|
2015-10-17 14:28:11 +00:00
|
|
|
static void dump_backtrace_entry(unsigned long where)
|
2012-03-05 11:49:27 +00:00
|
|
|
{
|
2015-10-17 14:28:11 +00:00
|
|
|
/*
|
|
|
|
* Note that 'where' can have a physical address, but it's not handled.
|
|
|
|
*/
|
2012-03-05 11:49:27 +00:00
|
|
|
print_ip_sym(where);
|
|
|
|
}
|
|
|
|
|
2016-06-13 10:15:14 +00:00
|
|
|
static void __dump_instr(const char *lvl, struct pt_regs *regs)
|
2012-03-05 11:49:27 +00:00
|
|
|
{
|
|
|
|
unsigned long addr = instruction_pointer(regs);
|
|
|
|
char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = -4; i < 1; i++) {
|
|
|
|
unsigned int val, bad;
|
|
|
|
|
|
|
|
bad = __get_user(val, &((u32 *)addr)[i]);
|
|
|
|
|
|
|
|
if (!bad)
|
|
|
|
p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
|
|
|
|
else {
|
|
|
|
p += sprintf(p, "bad PC value");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
printk("%sCode: %s\n", lvl, str);
|
2016-06-13 10:15:14 +00:00
|
|
|
}
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2016-06-13 10:15:14 +00:00
|
|
|
static void dump_instr(const char *lvl, struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
if (!user_mode(regs)) {
|
|
|
|
mm_segment_t fs = get_fs();
|
|
|
|
set_fs(KERNEL_DS);
|
|
|
|
__dump_instr(lvl, regs);
|
|
|
|
set_fs(fs);
|
|
|
|
} else {
|
|
|
|
__dump_instr(lvl, regs);
|
|
|
|
}
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
|
|
|
|
{
|
|
|
|
struct stackframe frame;
|
2016-02-11 21:53:10 +00:00
|
|
|
unsigned long irq_stack_ptr;
|
2015-12-15 08:33:41 +00:00
|
|
|
int skip;
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2016-02-11 21:53:10 +00:00
|
|
|
/*
|
|
|
|
* Switching between stacks is valid when tracing current and in
|
|
|
|
* non-preemptible context.
|
|
|
|
*/
|
|
|
|
if (tsk == current && !preemptible())
|
|
|
|
irq_stack_ptr = IRQ_STACK_PTR(smp_processor_id());
|
|
|
|
else
|
|
|
|
irq_stack_ptr = 0;
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
|
|
|
|
|
|
|
|
if (!tsk)
|
|
|
|
tsk = current;
|
|
|
|
|
2015-12-15 08:33:41 +00:00
|
|
|
if (tsk == current) {
|
2012-03-05 11:49:27 +00:00
|
|
|
frame.fp = (unsigned long)__builtin_frame_address(0);
|
2014-08-27 04:29:32 +00:00
|
|
|
frame.sp = current_stack_pointer;
|
2012-03-05 11:49:27 +00:00
|
|
|
frame.pc = (unsigned long)dump_backtrace;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* task blocked in __switch_to
|
|
|
|
*/
|
|
|
|
frame.fp = thread_saved_fp(tsk);
|
|
|
|
frame.sp = thread_saved_sp(tsk);
|
|
|
|
frame.pc = thread_saved_pc(tsk);
|
|
|
|
}
|
2015-12-15 08:33:41 +00:00
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
frame.graph = tsk->curr_ret_stack;
|
|
|
|
#endif
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2015-12-15 08:33:41 +00:00
|
|
|
skip = !!regs;
|
2015-12-21 16:44:27 +00:00
|
|
|
printk("Call trace:\n");
|
2012-03-05 11:49:27 +00:00
|
|
|
while (1) {
|
|
|
|
unsigned long where = frame.pc;
|
2015-10-17 14:28:11 +00:00
|
|
|
unsigned long stack;
|
2012-03-05 11:49:27 +00:00
|
|
|
int ret;
|
|
|
|
|
2015-12-15 08:33:41 +00:00
|
|
|
/* skip until specified stack frame */
|
|
|
|
if (!skip) {
|
|
|
|
dump_backtrace_entry(where);
|
|
|
|
} else if (frame.fp == regs->regs[29]) {
|
|
|
|
skip = 0;
|
|
|
|
/*
|
|
|
|
* Mostly, this is the case where this function is
|
|
|
|
* called in panic/abort. As exception handler's
|
|
|
|
* stack frame does not contain the corresponding pc
|
|
|
|
* at which an exception has taken place, use regs->pc
|
|
|
|
* instead.
|
|
|
|
*/
|
|
|
|
dump_backtrace_entry(regs->pc);
|
|
|
|
}
|
2015-12-15 08:33:40 +00:00
|
|
|
ret = unwind_frame(tsk, &frame);
|
2012-03-05 11:49:27 +00:00
|
|
|
if (ret < 0)
|
|
|
|
break;
|
2015-10-17 14:28:11 +00:00
|
|
|
stack = frame.sp;
|
2015-12-04 11:02:26 +00:00
|
|
|
if (in_exception_text(where)) {
|
|
|
|
/*
|
|
|
|
* If we switched to the irq_stack before calling this
|
|
|
|
* exception handler, then the pt_regs will be on the
|
|
|
|
* task stack. The easiest way to tell is if the large
|
|
|
|
* pt_regs would overlap with the end of the irq_stack.
|
|
|
|
*/
|
|
|
|
if (stack < irq_stack_ptr &&
|
|
|
|
(stack + sizeof(struct pt_regs)) > irq_stack_ptr)
|
|
|
|
stack = IRQ_STACK_TO_TASK_STACK(irq_stack_ptr);
|
|
|
|
|
2015-10-17 14:28:11 +00:00
|
|
|
dump_mem("", "Exception stack", stack,
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
stack + sizeof(struct pt_regs));
|
2015-12-04 11:02:26 +00:00
|
|
|
}
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void show_stack(struct task_struct *tsk, unsigned long *sp)
|
|
|
|
{
|
|
|
|
dump_backtrace(NULL, tsk);
|
|
|
|
barrier();
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
|
|
#define S_PREEMPT " PREEMPT"
|
|
|
|
#else
|
|
|
|
#define S_PREEMPT ""
|
|
|
|
#endif
|
|
|
|
#define S_SMP " SMP"
|
|
|
|
|
|
|
|
static int __die(const char *str, int err, struct thread_info *thread,
|
|
|
|
struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
struct task_struct *tsk = thread->task;
|
|
|
|
static int die_counter;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
|
|
|
|
str, err, ++die_counter);
|
|
|
|
|
|
|
|
/* trap and error numbers are mostly meaningless on ARM */
|
|
|
|
ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV);
|
|
|
|
if (ret == NOTIFY_STOP)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
print_modules();
|
|
|
|
__show_regs(regs);
|
|
|
|
pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
|
|
|
|
TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
|
|
|
|
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
if (!user_mode(regs)) {
|
2012-03-05 11:49:27 +00:00
|
|
|
dump_mem(KERN_EMERG, "Stack: ", regs->sp,
|
arm64: simplify dump_mem
Currently dump_mem attempts to dump memory in 64-bit chunks when
reporting a failure in 64-bit code, or 32-bit chunks when reporting a
failure in 32-bit code. We added code to handle these two cases
separately in commit e147ae6d7f908412 ("arm64: modify the dump mem for
64 bit addresses").
However, in all cases dump_mem is called, the failing context is a
kernel rather than user context. Additionally dump_mem is assumed to
only be used for kernel contexts, as internally it switches to
KERNEL_DS, and its callers pass kernel stack bounds.
This patch removes the redundant 32-bit chunk logic and associated
compat parameter, largely reverting the aforementioned commit. For the
call in __die(), the check of in_interrupt() is removed also, as __die()
is only called in response to faults from the kernel's exception level,
and thus the !user_mode(regs) check is sufficient. Were this not the
case, the used of task_stack_page(tsk) to generate the stack bounds
would be erroneous.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-13 10:15:15 +00:00
|
|
|
THREAD_SIZE + (unsigned long)task_stack_page(tsk));
|
2012-03-05 11:49:27 +00:00
|
|
|
dump_backtrace(regs, tsk);
|
|
|
|
dump_instr(KERN_EMERG, regs);
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEFINE_RAW_SPINLOCK(die_lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This function is protected against re-entrancy.
|
|
|
|
*/
|
|
|
|
void die(const char *str, struct pt_regs *regs, int err)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = current_thread_info();
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
oops_enter();
|
|
|
|
|
|
|
|
raw_spin_lock_irq(&die_lock);
|
|
|
|
console_verbose();
|
|
|
|
bust_spinlocks(1);
|
|
|
|
ret = __die(str, err, thread, regs);
|
|
|
|
|
|
|
|
if (regs && kexec_should_crash(thread->task))
|
|
|
|
crash_kexec(regs);
|
|
|
|
|
|
|
|
bust_spinlocks(0);
|
2013-01-21 06:47:39 +00:00
|
|
|
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
|
2012-03-05 11:49:27 +00:00
|
|
|
raw_spin_unlock_irq(&die_lock);
|
|
|
|
oops_exit();
|
|
|
|
|
|
|
|
if (in_interrupt())
|
|
|
|
panic("Fatal exception in interrupt");
|
|
|
|
if (panic_on_oops)
|
|
|
|
panic("Fatal exception");
|
|
|
|
if (ret != NOTIFY_STOP)
|
|
|
|
do_exit(SIGSEGV);
|
|
|
|
}
|
|
|
|
|
|
|
|
void arm64_notify_die(const char *str, struct pt_regs *regs,
|
|
|
|
struct siginfo *info, int err)
|
|
|
|
{
|
2014-04-06 22:04:12 +00:00
|
|
|
if (user_mode(regs)) {
|
|
|
|
current->thread.fault_address = 0;
|
|
|
|
current->thread.fault_code = err;
|
2012-03-05 11:49:27 +00:00
|
|
|
force_sig_info(info->si_signo, info, current);
|
2014-04-06 22:04:12 +00:00
|
|
|
} else {
|
2012-03-05 11:49:27 +00:00
|
|
|
die(str, regs, err);
|
2014-04-06 22:04:12 +00:00
|
|
|
}
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
2014-11-18 11:41:22 +00:00
|
|
|
static LIST_HEAD(undef_hook);
|
|
|
|
static DEFINE_RAW_SPINLOCK(undef_lock);
|
|
|
|
|
|
|
|
void register_undef_hook(struct undef_hook *hook)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
raw_spin_lock_irqsave(&undef_lock, flags);
|
|
|
|
list_add(&hook->node, &undef_hook);
|
|
|
|
raw_spin_unlock_irqrestore(&undef_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
void unregister_undef_hook(struct undef_hook *hook)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
raw_spin_lock_irqsave(&undef_lock, flags);
|
|
|
|
list_del(&hook->node);
|
|
|
|
raw_spin_unlock_irqrestore(&undef_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int call_undef_hook(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
struct undef_hook *hook;
|
|
|
|
unsigned long flags;
|
|
|
|
u32 instr;
|
|
|
|
int (*fn)(struct pt_regs *regs, u32 instr) = NULL;
|
|
|
|
void __user *pc = (void __user *)instruction_pointer(regs);
|
|
|
|
|
|
|
|
if (!user_mode(regs))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (compat_thumb_mode(regs)) {
|
|
|
|
/* 16-bit Thumb instruction */
|
|
|
|
if (get_user(instr, (u16 __user *)pc))
|
|
|
|
goto exit;
|
|
|
|
instr = le16_to_cpu(instr);
|
|
|
|
if (aarch32_insn_is_wide(instr)) {
|
|
|
|
u32 instr2;
|
|
|
|
|
|
|
|
if (get_user(instr2, (u16 __user *)(pc + 2)))
|
|
|
|
goto exit;
|
|
|
|
instr2 = le16_to_cpu(instr2);
|
|
|
|
instr = (instr << 16) | instr2;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* 32-bit ARM instruction */
|
|
|
|
if (get_user(instr, (u32 __user *)pc))
|
|
|
|
goto exit;
|
|
|
|
instr = le32_to_cpu(instr);
|
|
|
|
}
|
|
|
|
|
|
|
|
raw_spin_lock_irqsave(&undef_lock, flags);
|
|
|
|
list_for_each_entry(hook, &undef_hook, node)
|
|
|
|
if ((instr & hook->instr_mask) == hook->instr_val &&
|
|
|
|
(regs->pstate & hook->pstate_mask) == hook->pstate_val)
|
|
|
|
fn = hook->fn;
|
|
|
|
|
|
|
|
raw_spin_unlock_irqrestore(&undef_lock, flags);
|
|
|
|
exit:
|
|
|
|
return fn ? fn(regs, instr) : 1;
|
|
|
|
}
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
siginfo_t info;
|
|
|
|
void __user *pc = (void __user *)instruction_pointer(regs);
|
|
|
|
|
|
|
|
/* check for AArch32 breakpoint instructions */
|
2013-03-16 08:48:13 +00:00
|
|
|
if (!aarch32_break_handler(regs))
|
2012-03-05 11:49:27 +00:00
|
|
|
return;
|
|
|
|
|
2014-11-18 11:41:22 +00:00
|
|
|
if (call_undef_hook(regs) == 0)
|
|
|
|
return;
|
|
|
|
|
2015-07-03 14:08:08 +00:00
|
|
|
if (unhandled_signal(current, SIGILL) && show_unhandled_signals_ratelimited()) {
|
2012-03-05 11:49:27 +00:00
|
|
|
pr_info("%s[%d]: undefined instruction: pc=%p\n",
|
|
|
|
current->comm, task_pid_nr(current), pc);
|
|
|
|
dump_instr(KERN_INFO, regs);
|
|
|
|
}
|
|
|
|
|
|
|
|
info.si_signo = SIGILL;
|
|
|
|
info.si_errno = 0;
|
|
|
|
info.si_code = ILL_ILLOPC;
|
|
|
|
info.si_addr = pc;
|
|
|
|
|
|
|
|
arm64_notify_die("Oops - undefined instruction", regs, &info, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
long compat_arm_syscall(struct pt_regs *regs);
|
|
|
|
|
|
|
|
asmlinkage long do_ni_syscall(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
long ret;
|
|
|
|
if (is_compat_task()) {
|
|
|
|
ret = compat_arm_syscall(regs);
|
|
|
|
if (ret != -ENOSYS)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2015-06-19 14:28:03 +00:00
|
|
|
if (show_unhandled_signals_ratelimited()) {
|
2012-03-05 11:49:27 +00:00
|
|
|
pr_info("%s[%d]: syscall %d\n", current->comm,
|
|
|
|
task_pid_nr(current), (int)regs->syscallno);
|
|
|
|
dump_instr("", regs);
|
|
|
|
if (user_mode(regs))
|
|
|
|
__show_regs(regs);
|
|
|
|
}
|
|
|
|
|
|
|
|
return sys_ni_syscall();
|
|
|
|
}
|
|
|
|
|
2014-11-18 12:16:30 +00:00
|
|
|
static const char *esr_class_str[] = {
|
|
|
|
[0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
|
|
|
|
[ESR_ELx_EC_UNKNOWN] = "Unknown/Uncategorized",
|
|
|
|
[ESR_ELx_EC_WFx] = "WFI/WFE",
|
|
|
|
[ESR_ELx_EC_CP15_32] = "CP15 MCR/MRC",
|
|
|
|
[ESR_ELx_EC_CP15_64] = "CP15 MCRR/MRRC",
|
|
|
|
[ESR_ELx_EC_CP14_MR] = "CP14 MCR/MRC",
|
|
|
|
[ESR_ELx_EC_CP14_LS] = "CP14 LDC/STC",
|
|
|
|
[ESR_ELx_EC_FP_ASIMD] = "ASIMD",
|
|
|
|
[ESR_ELx_EC_CP10_ID] = "CP10 MRC/VMRS",
|
|
|
|
[ESR_ELx_EC_CP14_64] = "CP14 MCRR/MRRC",
|
|
|
|
[ESR_ELx_EC_ILL] = "PSTATE.IL",
|
|
|
|
[ESR_ELx_EC_SVC32] = "SVC (AArch32)",
|
|
|
|
[ESR_ELx_EC_HVC32] = "HVC (AArch32)",
|
|
|
|
[ESR_ELx_EC_SMC32] = "SMC (AArch32)",
|
|
|
|
[ESR_ELx_EC_SVC64] = "SVC (AArch64)",
|
|
|
|
[ESR_ELx_EC_HVC64] = "HVC (AArch64)",
|
|
|
|
[ESR_ELx_EC_SMC64] = "SMC (AArch64)",
|
|
|
|
[ESR_ELx_EC_SYS64] = "MSR/MRS (AArch64)",
|
|
|
|
[ESR_ELx_EC_IMP_DEF] = "EL3 IMP DEF",
|
|
|
|
[ESR_ELx_EC_IABT_LOW] = "IABT (lower EL)",
|
|
|
|
[ESR_ELx_EC_IABT_CUR] = "IABT (current EL)",
|
|
|
|
[ESR_ELx_EC_PC_ALIGN] = "PC Alignment",
|
|
|
|
[ESR_ELx_EC_DABT_LOW] = "DABT (lower EL)",
|
|
|
|
[ESR_ELx_EC_DABT_CUR] = "DABT (current EL)",
|
|
|
|
[ESR_ELx_EC_SP_ALIGN] = "SP Alignment",
|
|
|
|
[ESR_ELx_EC_FP_EXC32] = "FP (AArch32)",
|
|
|
|
[ESR_ELx_EC_FP_EXC64] = "FP (AArch64)",
|
|
|
|
[ESR_ELx_EC_SERROR] = "SError",
|
|
|
|
[ESR_ELx_EC_BREAKPT_LOW] = "Breakpoint (lower EL)",
|
|
|
|
[ESR_ELx_EC_BREAKPT_CUR] = "Breakpoint (current EL)",
|
|
|
|
[ESR_ELx_EC_SOFTSTP_LOW] = "Software Step (lower EL)",
|
|
|
|
[ESR_ELx_EC_SOFTSTP_CUR] = "Software Step (current EL)",
|
|
|
|
[ESR_ELx_EC_WATCHPT_LOW] = "Watchpoint (lower EL)",
|
|
|
|
[ESR_ELx_EC_WATCHPT_CUR] = "Watchpoint (current EL)",
|
|
|
|
[ESR_ELx_EC_BKPT32] = "BKPT (AArch32)",
|
|
|
|
[ESR_ELx_EC_VECTOR32] = "Vector catch (AArch32)",
|
|
|
|
[ESR_ELx_EC_BRK64] = "BRK (AArch64)",
|
|
|
|
};
|
|
|
|
|
|
|
|
const char *esr_get_class_string(u32 esr)
|
|
|
|
{
|
|
|
|
return esr_class_str[esr >> ESR_ELx_EC_SHIFT];
|
|
|
|
}
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
/*
|
|
|
|
* bad_mode handles the impossible case in the exception vector.
|
|
|
|
*/
|
|
|
|
asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
|
|
|
|
{
|
2013-05-28 14:54:15 +00:00
|
|
|
siginfo_t info;
|
|
|
|
void __user *pc = (void __user *)instruction_pointer(regs);
|
2012-03-05 11:49:27 +00:00
|
|
|
console_verbose();
|
|
|
|
|
2016-05-31 11:07:47 +00:00
|
|
|
pr_crit("Bad mode in %s handler detected on CPU%d, code 0x%08x -- %s\n",
|
|
|
|
handler[reason], smp_processor_id(), esr,
|
|
|
|
esr_get_class_string(esr));
|
2013-05-28 14:54:15 +00:00
|
|
|
__show_regs(regs);
|
|
|
|
|
|
|
|
info.si_signo = SIGILL;
|
|
|
|
info.si_errno = 0;
|
|
|
|
info.si_code = ILL_ILLOPC;
|
|
|
|
info.si_addr = pc;
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2013-05-28 14:54:15 +00:00
|
|
|
arm64_notify_die("Oops - bad mode", regs, &info, 0);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void __pte_error(const char *file, int line, unsigned long val)
|
|
|
|
{
|
2015-12-21 16:44:27 +00:00
|
|
|
pr_err("%s:%d: bad pte %016lx.\n", file, line, val);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void __pmd_error(const char *file, int line, unsigned long val)
|
|
|
|
{
|
2015-12-21 16:44:27 +00:00
|
|
|
pr_err("%s:%d: bad pmd %016lx.\n", file, line, val);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
2014-05-12 09:40:51 +00:00
|
|
|
void __pud_error(const char *file, int line, unsigned long val)
|
|
|
|
{
|
2015-12-21 16:44:27 +00:00
|
|
|
pr_err("%s:%d: bad pud %016lx.\n", file, line, val);
|
2014-05-12 09:40:51 +00:00
|
|
|
}
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
void __pgd_error(const char *file, int line, unsigned long val)
|
|
|
|
{
|
2015-12-21 16:44:27 +00:00
|
|
|
pr_err("%s:%d: bad pgd %016lx.\n", file, line, val);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
2015-07-24 15:37:48 +00:00
|
|
|
/* GENERIC_BUG traps */
|
|
|
|
|
|
|
|
int is_valid_bugaddr(unsigned long addr)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* bug_handler() only called for BRK #BUG_BRK_IMM.
|
|
|
|
* So the answer is trivial -- any spurious instances with no
|
|
|
|
* bug table entry will be rejected by report_bug() and passed
|
|
|
|
* back to the debug-monitors code and handled as a fatal
|
|
|
|
* unexpected debug exception.
|
|
|
|
*/
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int bug_handler(struct pt_regs *regs, unsigned int esr)
|
|
|
|
{
|
|
|
|
if (user_mode(regs))
|
|
|
|
return DBG_HOOK_ERROR;
|
|
|
|
|
|
|
|
switch (report_bug(regs->pc, regs)) {
|
|
|
|
case BUG_TRAP_TYPE_BUG:
|
|
|
|
die("Oops - BUG", regs, 0);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case BUG_TRAP_TYPE_WARN:
|
2015-07-24 15:37:49 +00:00
|
|
|
/* Ideally, report_bug() should backtrace for us... but no. */
|
|
|
|
dump_backtrace(regs, NULL);
|
2015-07-24 15:37:48 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
/* unknown/unrecognised bug trap type */
|
|
|
|
return DBG_HOOK_ERROR;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If thread survives, skip over the BUG instruction and continue: */
|
|
|
|
regs->pc += AARCH64_INSN_SIZE; /* skip BRK and resume */
|
|
|
|
return DBG_HOOK_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct break_hook bug_break_hook = {
|
|
|
|
.esr_val = 0xf2000000 | BUG_BRK_IMM,
|
|
|
|
.esr_mask = 0xffffffff,
|
|
|
|
.fn = bug_handler,
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initial handler for AArch64 BRK exceptions
|
|
|
|
* This handler only used until debug_traps_init().
|
|
|
|
*/
|
|
|
|
int __init early_brk64(unsigned long addr, unsigned int esr,
|
|
|
|
struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
return bug_handler(regs, esr) != DBG_HOOK_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* This registration must happen early, before debug_traps_init(). */
|
2012-03-05 11:49:27 +00:00
|
|
|
void __init trap_init(void)
|
|
|
|
{
|
2015-07-24 15:37:48 +00:00
|
|
|
register_break_hook(&bug_break_hook);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|