@@ -52,15 +52,14 @@ static const char *handler[]= {
int show_unhandled_signals = 1;
/*
- * Dump out the contents of some memory nicely...
+ * Dump out the contents of some kernel memory nicely...
*/
static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
- unsigned long top, bool compat)
+ unsigned long top)
{
unsigned long first;
mm_segment_t fs;
int i;
- unsigned int width = compat ? 4 : 8;
/*
* We need to switch to kernel mode so that we can use __get_user
@@ -78,22 +77,15 @@ static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
memset(str, ' ', sizeof(str));
str[sizeof(str) - 1] = '\0';
- for (p = first, i = 0; i < (32 / width)
- && p < top; i++, p += width) {
+ for (p = first, i = 0; i < (32 / 8)
+ && p < top; i++, p += 8) {
if (p >= bottom && p < top) {
unsigned long val;
- if (width == 8) {
- if (__get_user(val, (unsigned long *)p) == 0)
- sprintf(str + i * 17, " %016lx", val);
- else
- sprintf(str + i * 17, " ????????????????");
- } else {
- if (__get_user(val, (unsigned int *)p) == 0)
- sprintf(str + i * 9, " %08lx", val);
- else
- sprintf(str + i * 9, " ????????");
- }
+ if (__get_user(val, (unsigned long *)p) == 0)
+ sprintf(str + i * 17, " %016lx", val);
+ else
+ sprintf(str + i * 17, " ????????????????");
}
}
printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
@@ -216,7 +208,7 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
stack = IRQ_STACK_TO_TASK_STACK(irq_stack_ptr);
dump_mem("", "Exception stack", stack,
- stack + sizeof(struct pt_regs), false);
+ stack + sizeof(struct pt_regs));
}
}
}
@@ -254,10 +246,9 @@ static int __die(const char *str, int err, struct thread_info *thread,
pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
- if (!user_mode(regs) || in_interrupt()) {
+ if (!user_mode(regs)) {
dump_mem(KERN_EMERG, "Stack: ", regs->sp,
- THREAD_SIZE + (unsigned long)task_stack_page(tsk),
- compat_user_mode(regs));
+ THREAD_SIZE + (unsigned long)task_stack_page(tsk));
dump_backtrace(regs, tsk);
dump_instr(KERN_EMERG, regs);
}
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: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> --- arch/arm64/kernel/traps.c | 31 +++++++++++-------------------- 1 file changed, 11 insertions(+), 20 deletions(-) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel