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Clean up arm_semihosting() entry a bit, comment some issues and just
which SVC opcodes are getting intercepted. Microcontroller profile
cores will need a new entry, since they use BKPT instead (and don't
have either SVC mode or an SPSR register).
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
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Store a flag and errno in in "struct arm".
Have "poll" output report when semihosting is active.
Shrink some of the affected lines.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
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Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
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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>
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