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openrisc: support framepointers and STACKTRACE_SUPPORT

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For lockdep support a reliable stack trace mechanism is needed.  This
patch adds support in OpenRISC for the stacktrace framework, implemented
by a simple unwinder api.  The unwinder api supports both framepointer
and basic stack tracing.

The unwinder is now used to replace the stack_dump() implementation as
well. The new traces are inline with other architectures trace format:

 Call trace:
 [<c0004448>] show_stack+0x3c/0x58
 [<c031c940>] dump_stack+0xa8/0xe4
 [<c0008104>] __cpu_up+0x64/0x130
 [<c000d268>] bringup_cpu+0x3c/0x178
 [<c000d038>] cpuhp_invoke_callback+0xa8/0x1fc
 [<c000d680>] cpuhp_up_callbacks+0x44/0x14c
 [<c000e400>] cpu_up+0x14c/0x1bc
 [<c041da60>] smp_init+0x104/0x15c
 [<c033843c>] ? kernel_init+0x0/0x140
 [<c0415e04>] kernel_init_freeable+0xbc/0x25c
 [<c033843c>] ? kernel_init+0x0/0x140
 [<c0338458>] kernel_init+0x1c/0x140
 [<c003a174>] ? schedule_tail+0x18/0xa0
 [<c0006b80>] ret_from_fork+0x1c/0x9c

Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne
2017-07-24 21:44:35 +09:00
parent 306e5e50a3
commit eecac38b04
6 changed files with 224 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
arch/openrisc/kernel/traps.c
View File

@@ -38,6 +38,7 @@
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/unwinder.h>
extern char _etext, _stext;
@@ -45,61 +46,20 @@ int kstack_depth_to_print = 0x180;
int lwa_flag;
unsigned long __user *lwa_addr;
static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
void print_trace(void *data, unsigned long addr, int reliable)
{
return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
}
void show_trace(struct task_struct *task, unsigned long *stack)
{
struct thread_info *context;
unsigned long addr;
context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));
while (valid_stack_ptr(context, stack)) {
addr = *stack++;
if (__kernel_text_address(addr)) {
printk(" [<%08lx>]", addr);
print_symbol(" %s", addr);
printk("\n");
}
}
printk(" =======================\n");
pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
(void *) addr);
}
/* displays a short stack trace */
void show_stack(struct task_struct *task, unsigned long *esp)
{
unsigned long addr, *stack;
int i;
if (esp == NULL)
esp = (unsigned long *)&esp;
stack = esp;
printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
for (i = 0; i < kstack_depth_to_print; i++) {
if (kstack_end(stack))
break;
if (__get_user(addr, stack)) {
/* This message matches "failing address" marked
s390 in ksymoops, so lines containing it will
not be filtered out by ksymoops. */
printk("Failing address 0x%lx\n", (unsigned long)stack);
break;
}
stack++;
printk("sp + %02d: 0x%08lx\n", i * 4, addr);
}
printk("\n");
show_trace(task, esp);
return;
pr_emerg("Call trace:\n");
unwind_stack(NULL, esp, print_trace);
}
void show_trace_task(struct task_struct *tsk)
@@ -115,7 +75,7 @@ void show_registers(struct pt_regs *regs)
int in_kernel = 1;
unsigned long esp;
esp = (unsigned long)(&regs->sp);
esp = (unsigned long)(regs->sp);
if (user_mode(regs))
in_kernel = 0;