Re: gdb: Can not access memory at address 0x0

• Subject: Re: gdb: Can not access memory at address 0x0
• From: Chris Sarcone <email@hidden>
• Date: Mon, 20 Sep 2004 10:01:00 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Lalit --

1) Target: nvram boot-args="debug=0x14e"

2) Reboot target.
3) Host: arp -s <target> <mac address>
4) Target: kextload -l -s /tmp my_driver.kext
5) Target: tar -cvf sym.tar /tmp/*.sym
6) ftp host, put sym.tar, also put source
7) Host: untar sym.tar
8) Host: gdb mach_kernel (from th SDK)
9) Host: (gdb) target remote-kdb

remote-kdp (but this is probably a mis-type right?)

10) Host: Add the symbols
11) Target: kextload -m my_driver.kext
12) Target : Run test so that systme becomes non-responsive
13) Target: Give NMI to enter into debugging
14) Host: (gdb) attach target
15) source kgmacros
16) showallstacks
17) Get the message: Cannot access memory at address 0x0

Try doing:

(gdb) p proc0

Then the showallstacks. Sometimes gdb needs a 'poke' to get going.

HTH,

-- Chris

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fax:   (408) 862-7577
email: email@hidden

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