The GDB tool always returns "Cannot access memory" for me, even on
valid addresses. I proved that with a panic.log from the same
machine and OS which is running GDB.
Using an "assert()" in my kext, I generated a panic.log on the same
machine. Then I ran kextstat and checked that the addresses in this
panic.log fell within the ranges of the kexts involved. Then I tried
to read those addresses with the GDB tool. GDB still returned
"Cannot access memory" for valid addresses in my kext, and also for
addresses within the ranges of several "com.apple.X" kexts.
If you're trying to access memory in your device's address space, you
may need to use the kdp_read_io (mapped memory) and/or kdp_trans_off
(phsical addresses) options. Check here for more info:
Also, I have heard that kdp_trans_off will affect lots of things in
gdb, so its best to enable and then disable before attempting
anything else.
Jim
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