Step debugging with QEMU
Posted: Sun Mar 14, 2010 4:32 pm
I've got my kernel working with PowerPC (isim built into gdb) but I've started to port it over to x86.
Seeing as there's no built in simulator that I could see, I've followed the debugging information on this site and have QEMU built and working. However, I only seem to be able to debug to breakpoints - if i continue or "step" then execution continues until the next breakpoint rather than stepping correctly.
The only changes I've made to QEMU (0.12.13) are to run the socket as Ip4 rather than Ip6.
Is this caused by something in the kernel that it should be stepping up or is it solely an error in my QEMU build?
Below is the change I made to QEMU:
Any ideas how I can get QEMU to step properly?
Ta
Seeing as there's no built in simulator that I could see, I've followed the debugging information on this site and have QEMU built and working. However, I only seem to be able to debug to breakpoints - if i continue or "step" then execution continues until the next breakpoint rather than stepping correctly.
The only changes I've made to QEMU (0.12.13) are to run the socket as Ip4 rather than Ip6.
Is this caused by something in the kernel that it should be stepping up or is it solely an error in my QEMU build?
Below is the change I made to QEMU:
Code: Select all
diff -urpN qemu-0.12.1/gdbstub.c samos_qemu-0.12.1/gdbstub.c
--- qemu-0.12.1/gdbstub.c 2009-12-20 01:32:16.000000000 +0000
+++ samos_qemu-0.12.1/gdbstub.c 2010-01-17 16:43:29.752978300 +0000
@@ -2564,7 +2564,7 @@ int gdbserver_start(const char *device)
if (strstart(device, "tcp:", NULL)) {
/* enforce required TCP attributes */
snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
- "%s,nowait,nodelay,server", device);
+ "%s,nowait,nodelay,server,ipv4", device);
device = gdbstub_device_name;
}
#ifndef _WIN32
Ta