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basic ARM semihosting support

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Semihosting enables code running on an ARM target to use the
I/O facilities on the host computer. The target application must
be linked against a library that forwards operation requests by
using the SVC instruction that is trapped at the Supervisor Call
vector by the debugger.  The "hosted" library version provided
with CodeSourcery's Sourcery G++ Lite for ARM EABI is one example.

This is currently available for ARM9 processors, but any ARM
variant should be able to support this with little additional work.

Tested using binaries compiled with Sourcery G++ Lite 2009q1-161
and ARM RVCT 3.0.

[dbrownell@users.sourceforge.net: doc tweaks, NEWS]

Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
Nicolas Pitre
2009-12-03 17:27:13 -05:00
committed by David Brownell
parent f62c035c52
commit ed59dfc80a
6 changed files with 528 additions and 0 deletions
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11
doc/openocd.texi
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@@ -5674,6 +5674,17 @@ cables (FT2232), but might be unsafe if used with targets running at very low
speeds, like the 32kHz startup clock of an AT91RM9200.
@end deffn
@deffn Command {arm7_9 semihosting} [@option{enable}|@option{disable}]
Display status of semihosting, after optionally changing that status.
Semihosting allows for code executing on an ARM target to use the
I/O facilities on the host computer i.e. the system where OpenOCD
is running. The target application must be linked against a library
implementing the ARM semihosting convention that forwards operation
requests by using a special SVC instruction that is trapped at the
Supervisor Call vector by OpenOCD.
@end deffn
@subsection ARM720T specific commands
@cindex ARM720T