Re: functions about dump backtrace function names in mips arch
On Mon, 2011-01-03 at 22:32 +0800, loody wrote: > hi all: > > 2011/1/3 Sowmya Sridharan : > > > > Hi, > > > > I was able to check it in 2.6.36 version of kernel, and it is defined in > > traps.c. > > http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L205 > > > > dump_stack() calls show_backtrace function which had been show_trace in the > > earlier kernel versions. [...] > > > > [...] > > Regards, > > Sowmya > thanks for your kind help, that is what I want. > previously, I only see the address instead of function name, but after > I select CONFIG_KALLSYMS as Y, I can see the function names also. > BTW, what is the mechanism that kernel take to find out the function name? Enabling the config option, it allows to build the symbol table for kernel. It uses /proc/kallsyms. Below links could help: http://tldp.org/HOWTO/Module-HOWTO/x627.html http://fixunix.com/kernel/134739-proc-kallsyms-symbol-size.html > Regards, > miloody -- Thanks, Nilesh ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: functions about dump backtrace function names in mips arch
hi:
2011/1/3 loody :
> hi all:
>
> 2011/1/3 Sowmya Sridharan :
>>
>> Hi,
>>
>> I was able to check it in 2.6.36 version of kernel, and it is defined in
>> traps.c.
>> http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L205
>>
>> dump_stack() calls show_backtrace function which had been show_trace in the
>> earlier kernel versions.
>> I compared between 2.6.14 and the latest version, and here are the
>> differences:
>> ---
>> http://lxr.linux.no/linux+v2.6.14/arch/mips/kernel/traps.c#L110
>> function: show_trace
>> while (!kstack_end(stack)) {
>> addr = *stack++;
>> if (__kernel_text_address(addr)) {
>> printk(" [<%0*lx>] ", field, addr);
>> print_symbol("%s\n", addr);
>> }
>> }
>> -
>> In the latest kernel, show_backtrace function is used, which does the same
>> thing, but through different functions
>> http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L126
>> function: show_backtrace
>> printk("Call Trace:\n");
>> do {
>> print_ip_sym(pc);
>> pc = unwind_stack(task, &sp, pc, &ra);
>> } while (pc);
>>
>>
>> Regards,
>> Sowmya
> thanks for your kind help, that is what I want.
> previously, I only see the address instead of function name, but after
> I select CONFIG_KALLSYMS as Y, I can see the function names also.
> BTW, what is the mechanism that kernel take to find out the function name?
from log such as:
<80128580>] do_softirq+0x48/0x68
i know 0x48 is the offset of do_softirq, but how can I locate precise
what the offset 0x48 of do_softirq is? "objdump -s"?
Regards,
miloody
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Re: functions about dump backtrace function names in mips arch
hi all:
2011/1/3 Sowmya Sridharan :
>
> Hi,
>
> I was able to check it in 2.6.36 version of kernel, and it is defined in
> traps.c.
> http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L205
>
> dump_stack() calls show_backtrace function which had been show_trace in the
> earlier kernel versions.
> I compared between 2.6.14 and the latest version, and here are the
> differences:
> ---
> http://lxr.linux.no/linux+v2.6.14/arch/mips/kernel/traps.c#L110
> function: show_trace
> while (!kstack_end(stack)) {
> addr = *stack++;
> if (__kernel_text_address(addr)) {
> printk(" [<%0*lx>] ", field, addr);
> print_symbol("%s\n", addr);
> }
> }
> -
> In the latest kernel, show_backtrace function is used, which does the same
> thing, but through different functions
> http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L126
> function: show_backtrace
> printk("Call Trace:\n");
> do {
> print_ip_sym(pc);
> pc = unwind_stack(task, &sp, pc, &ra);
> } while (pc);
>
>
> Regards,
> Sowmya
thanks for your kind help, that is what I want.
previously, I only see the address instead of function name, but after
I select CONFIG_KALLSYMS as Y, I can see the function names also.
BTW, what is the mechanism that kernel take to find out the function name?
Regards,
miloody
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Re: functions about dump backtrace function names in mips arch
Hi,
I was able to check it in 2.6.36 version of kernel, and it is defined in
traps.c.
http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L205
dump_stack() calls show_backtrace function which had been show_trace in
the earlier kernel versions.
I compared between 2.6.14 and the latest version, and here are the
differences:
---
http://lxr.linux.no/linux+v2.6.14/arch/mips/kernel/traps.c#L110
function: show_trace
while (!kstack_end(stack)) {
addr = *stack++;
if (__kernel_text_address(addr)) {
printk(" [<%0*lx>] ", field, addr);
print_symbol("%s\n", addr);
}
}
-
In the latest kernel, show_backtrace function is used, which does the same
thing, but through different functions
http://lxr.linux.no/linux+v2.6.36/arch/mips/kernel/traps.c#L126
function: show_backtrace
printk("Call Trace:\n");
do {
print_ip_sym(pc);
pc = unwind_stack(task, &sp, pc, &ra);
} while (pc);
Regards,
Sowmya
kernelnewbies-boun...@kernelnewbies.org wrote on 01/02/2011 04:31:08 PM:
> [image removed]
>
> Re: functions about dump backtrace function names in mips arch
>
> Mulyadi Santosa
>
> to:
>
> loody
>
> 01/02/2011 04:33 PM
>
> Sent by:
>
> kernelnewbies-boun...@kernelnewbies.org
>
> Cc:
>
> Kernel Newbies
>
> On Sun, Jan 2, 2011 at 15:26, loody wrote:
> > Dear all:
> > If i remember correctly, when kernel panic there is a function I can
> > use to dump all the names of backtrace functions.
> > I have searched arch/mips/traps.c, but I only can see the dump
> > functions of cpu registers,
>
> In x86, it's dump_stack(). The definition can be read here online:
> http://lxr.linux.no/#linux+v2.6.36/arch/x86/kernel/dumpstack.c#L198
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>
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Re: functions about dump backtrace function names in mips arch
On Sun, Jan 2, 2011 at 15:26, loody wrote: > Dear all: > If i remember correctly, when kernel panic there is a function I can > use to dump all the names of backtrace functions. > I have searched arch/mips/traps.c, but I only can see the dump > functions of cpu registers, In x86, it's dump_stack(). The definition can be read here online: http://lxr.linux.no/#linux+v2.6.36/arch/x86/kernel/dumpstack.c#L198 -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
