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semihosting: support fileio operation

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This patch adds support for bridging semihosting to GDB's File-I/O
remote protocol extension. For the most part operations match up 1:1,
however some require a working area to complete successfully, namely
operations that devolve to read, stat, and gettimeofday.

A new command was added to enable support for fileio named `arm
semihosting_fileio`, which ensures that the default behavior remains
intact for those that prefer it.

Finally, redundant logging was removed from the target_arch_state
function; this permits ARM targets to quiesce log output when polling
for a fileio reply. This prevents filling the logs with halt/resume
messages when using semihosting fileio.

Change-Id: Ifbb864fc2373336a501cc0332675b887b552e1ee
Signed-off-by: Steven Stallion <stallion@squareup.com>
Reviewed-on: http://openocd.zylin.com/3566
Tested-by: jenkins
Reviewed-by: Steven Stallion <sstallion@gmail.com>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
This commit is contained in:
Steven Stallion
2016-07-22 15:43:11 -05:00
committed by Paul Fertser
parent dc0a009ef4
commit c0e7ccbd87
12 changed files with 448 additions and 158 deletions
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11
doc/openocd.texi
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@@ -7404,6 +7404,17 @@ requests by using a special SVC instruction that is trapped at the
Supervisor Call vector by OpenOCD.
@end deffn
@deffn Command {arm semihosting_fileio} [@option{enable}|@option{disable}]
@cindex ARM semihosting
Display status of semihosting fileio, after optionally changing that
status.
Enabling this option forwards semihosting I/O to GDB process using the
File-I/O remote protocol extension. This is especially useful for
interacting with remote files or displaying console messages in the
debugger.
@end deffn
@section ARMv4 and ARMv5 Architecture
@cindex ARMv4
@cindex ARMv5