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-bounces@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-bounces@kernelnewbies.org

Cc:

Kernel Newbies

On Sun, Jan 2, 2011 at 15:26, loody <miloody@gmail.com> 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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hi: 2011/1/3 loody <miloody@gmail.com>:

hi all:

2011/1/3 Sowmya Sridharan <sowmya.sridharan@tcs.com>:

...

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