Can't see function parameters using GDB

Advancid · **Joined:** Mon Aug 24, 2015 7:37 am **Posts:** 1

Hello,

I'm using GDB to debug my kernel with QEMU.
It works well but I can't see the function parameters.
It outputs the following for example:

Code:

Breakpoint 3, memsetw (
    dest=<error reading variable: can't compute CFA for this frame>, 
    val=<error reading variable: can't compute CFA for this frame>, 
    count=<error reading variable: can't compute CFA for this frame>)
    at kernel/memory.c:26
26   uint16_t *memsetw(uint16_t *dest, uint16_t val, size_t count) {

I searched but I didn't find anything.
Here are the flags I'm using:

gcc (compiler and linker): -ffreestanding -Ikernel/include -Wall -Wextra -std=gnu99 -g -nostdlib
as: -g

Then I use the following command to start QEMU:

Code:

qemu-system-i386 -kernel kernel/kernel-debug -s -S

And I connect to QEMU with GDB by using this command:

Code:

gdb -ex "target remote localhost:1234" kernel/kernel-debug

Thank you for you help.

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Can't see function parameters using GDB

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