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[PATCH] i386: multi-column stack backtraces

Bläddra i källkod 
Print stack backtraces in multiple columns, saving screen space.  Number of
columns is configurable and defaults to one so behavior is
backwards-compatible.

Also removes the brackets around addresses when printing more
that one entry per line so they print as:
    <address>
instead of:
    [<address>]
This helps multiple entries fit better on one line.

Original idea by Dave Jones, taken from x86_64.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chuck Ebbert
2006-03-23 02:59:30 -08:00
committad av Linus Torvalds
förälder b824eb605c
incheckning 4d7d8c82c1
2 ändrade filer med 36 tillägg och 5 borttagningar
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32
arch/i386/kernel/traps.c
Visa fil

@@ -112,12 +112,30 @@ static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
p < (void *)tinfo + THREAD_SIZE - 3;
}
static void print_addr_and_symbol(unsigned long addr, char *log_lvl)
/*
* Print CONFIG_STACK_BACKTRACE_COLS address/symbol entries per line.
*/
static inline int print_addr_and_symbol(unsigned long addr, char *log_lvl,
int printed)
{
printk(log_lvl);
if (!printed)
printk(log_lvl);
#if CONFIG_STACK_BACKTRACE_COLS == 1
printk(" [<%08lx>] ", addr);
#else
printk(" <%08lx> ", addr);
#endif
print_symbol("%s", addr);
printk("\n");
printed = (printed + 1) % CONFIG_STACK_BACKTRACE_COLS;
if (printed)
printk(" ");
else
printk("\n");
return printed;
}
static inline unsigned long print_context_stack(struct thread_info *tinfo,
@@ -125,20 +143,24 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo,
char *log_lvl)
{
unsigned long addr;
int printed = 0; /* nr of entries already printed on current line */
#ifdef CONFIG_FRAME_POINTER
while (valid_stack_ptr(tinfo, (void *)ebp)) {
addr = *(unsigned long *)(ebp + 4);
print_addr_and_symbol(addr, log_lvl);
printed = print_addr_and_symbol(addr, log_lvl, printed);
ebp = *(unsigned long *)ebp;
}
#else
while (valid_stack_ptr(tinfo, stack)) {
addr = *stack++;
if (__kernel_text_address(addr))
print_addr_and_symbol(addr, log_lvl);
printed = print_addr_and_symbol(addr, log_lvl, printed);
}
#endif
if (printed)
printk("\n");
return ebp;
}