Hi all,
I've developed an application for ARM intergrator and it is running find under
QEMU. I am trying to redirect my serial data to my custom emulated device. For
that I've inserted memory watch point at Pl011 UART controllers Data Register
so that whenever some access is made to this register my registered function
gets invoked which will redirect request to my custom emulated device.
I've few questions:
cpu_watchpoint_insert needs a CPU_State parameter. From where can I get this
CPU state.I tried putting code in vl.c and called my custom_init function from
main before main_loop(). Below is source code of my custom_init function:
static void custom_init()
{
CPUState *env;
int err = 0;
for (env = first_cpu; env != NULL; env = env->next_cpu) {
err = cpu_watchpoint_insert(env,369098752,8,BP_MEM_WRITE,NULL);
if (err)
printf("\n Got an error while inserting watchpoint");
}
qemu_add_vm_change_state_handler(myfunc,NULL);
}
This function gets called and does not return error, but when I run my
application it gives me following error of segmentation fault:
VNC server running on `127.0.0.1:5900'
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208740160 (LWP 1912)]
gdb_set_stop_cpu (env=0x9ef36a0) at
/usr/QEMU_Learning/QEMU_Src/qemu-0.12.3/gdbstub.c:2114
2114 gdbserver_state->c_cpu = env;
(gdb) p env
$1 = (struct CPUARMState *) 0x9ef36a0
(gdb) p gdbserver_state->c_cpu
Cannot access memory at address 0x0
Can anybody tell me whats wrong with this?
Thanks,
Taimoor
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