[Gdb] examining mmap memory?

[David Feng]

I am debugging an user space program that maps in some PCI memory using mmap via my device driver.  The program runs fine and is able access the PCI memory fine using the returned pointer from mmap.  However, when I am in gdb stepping through the program, I get a "Cannot access memory at address 0x40231d00" message when I try to use that pointer to examine memory.

 

The memory is mapped at 0x40231000 and the size is 0x1000.  I have added a mem region as follows:

 

Num Enb Low Addr      High Addr     Attrs

1      y     0x40231000  0x40232000  rw 32 nocache

 

I am running Debian linux version 2.4.19.

 

thanks,

 

Dave Feng

 

 

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