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ARC: gdbserver breakage in Big-Endian configuration #1
[Based on mainline commit 502a0c775c7f0a: "ARC: pt_regs update imx6-dongle#5"]
gdbserver needs @stop_pc, served by ptrace, but fetched from pt_regs
differently, based on in_brkpt_traps(), which in turn relies on
additional machine state in pt_regs->event bitfield.
unsigned long orig_r8:16, event:16;
For big endian config, this macro was returning false, despite being in
breakpoint Trap exception, causing wrong @stop_pc to be returned to gdb.
Issue #1: In BE, @event above is at offset 2 in word, while a STW insn
at offset 0 was used to update it. Resort to using ST insn
which updates the half-word at right location.
Issue imx6-dongle#2: The union involving bitfields causes all the members to be
laid out at offset 0. So with fix#1 above, ASM was now
updating at offset 2, "C" code was still referencing at
offset 0. Fixed by wrapping bitfield in a struct.
Reported-by: Noam Camus <[email protected]>
Tested-by: Anton Kolesov <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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