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xtensa: rearrange show_stack output

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Minimal stack alignment on xtensa is 16 bytes, having stack dump in
32-byte lines may be visually misleading as the stack frame border may
be in the middle of the line.
Arrange stack dump in 16-byte lines. Mark lines at stack frame borders
with arrows.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2023-03-17 16:18:07 -07:00
parent f29cf77609
commit cc34f2909d
1 changed files with 42 additions and 15 deletions
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55
arch/xtensa/kernel/traps.c
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@ -549,31 +549,58 @@ static void show_trace(struct task_struct *task, unsigned long *sp,
}
#define STACK_DUMP_ENTRY_SIZE 4
#define STACK_DUMP_LINE_SIZE 32
#define STACK_DUMP_LINE_SIZE 16
static size_t kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH;
struct stack_fragment
{
size_t len;
size_t off;
u8 *sp;
const char *loglvl;
};
static int show_stack_fragment_cb(struct stackframe *frame, void *data)
{
struct stack_fragment *sf = data;
while (sf->off < sf->len) {
u8 line[STACK_DUMP_LINE_SIZE];
size_t line_len = sf->len - sf->off > STACK_DUMP_LINE_SIZE ?
STACK_DUMP_LINE_SIZE : sf->len - sf->off;
bool arrow = sf->off == 0;
if (frame && frame->sp == (unsigned long)(sf->sp + sf->off))
arrow = true;
__memcpy(line, sf->sp + sf->off, line_len);
print_hex_dump(sf->loglvl, arrow ? "> " : " ", DUMP_PREFIX_NONE,
STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE,
line, line_len, false);
sf->off += STACK_DUMP_LINE_SIZE;
if (arrow)
return 0;
}
return 1;
}
void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
{
size_t len, off = 0;
struct stack_fragment sf;
if (!sp)
sp = stack_pointer(task);
len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE),
sf.len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE),
kstack_depth_to_print * STACK_DUMP_ENTRY_SIZE);
sf.off = 0;
sf.sp = (u8 *)sp;
sf.loglvl = loglvl;
printk("%sStack:\n", loglvl);
while (off < len) {
u8 line[STACK_DUMP_LINE_SIZE];
size_t line_len = len - off > STACK_DUMP_LINE_SIZE ?
STACK_DUMP_LINE_SIZE : len - off;
__memcpy(line, (u8 *)sp + off, line_len);
print_hex_dump(loglvl, " ", DUMP_PREFIX_NONE,
STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE,
line, line_len, false);
off += STACK_DUMP_LINE_SIZE;
}
walk_stackframe(sp, show_stack_fragment_cb, &sf);
while (sf.off < sf.len)
show_stack_fragment_cb(NULL, &sf);
show_trace(task, sp, loglvl);
}