K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2018-07-25T18:11:37.365670Z
K 7
svn:log
V 657
Raise a proper SIGTRAP / TRAP_TRACE signal for a PT_STEP step on arm.

Previously, a step by PT_STEP resulted in no signal being raised to
the debugger so that a step was silently completed with the program
continuing to execute after the step.  Fix by raising a SIGTRAP
signal with TRAP_TRACE as the signal code.

To simplify the error handling cases (if ptrace_clear_single_step()
fails, etc.) move the handling of PTRACE_BREAKPOINT into the
gdb_trapper() function.  If ptrace_clear_single_step() fails,
gdb_trapper() won't claim the fault, and the default case of
SIGILL / ILL_OPC will be used.

Differential Revision:	https://reviews.freebsd.org/D16100

END