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Update TODO and a README

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Gregory Nutt 2014-09-16 13:58:55 -06:00
parent 02c3e834d5
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configs/sama5d4-ek/README.txt
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@ -3930,23 +3930,10 @@ Configurations
file system. A considerable amount of testing has been done and file system. A considerable amount of testing has been done and
there are no known defects as of this writing. there are no known defects as of this writing.
2014-9-13: Currently a program running as a process in the kernel build 2014-9-16: After some substantial effort, I think I may have resolved
mode cannot run other programs that reside on the file system. Why? the last of the mainstream bugs that prevented from executing other
Because in order to run those other programs, the new program's user processes from a user processes. Long story but I am glad to
address environment must be instantiated in memory to load the .text haave that done.
and .data and to allocate the initial user space components from the
new user heap.
However, the previous program's stack currently resides in its heap.
So when a process tries to run another program, its heap is unmapped
and the system crashes. The fix is to add a separate stack in a
separate memory region that does not get unmapped when creating new
processes. There are hooks in place to do this; I just need to get
time to get that done.
To see the bug in action:
nsh> /bin/hello
nsh: nsh: