Add x86_debug_reg_state to gdbserver

This commit introduces a new function, x86_debug_reg_state, that
shared x86 code can use to access the local mirror of a process's
debug registers.  This function already existed in GDB and was
in use by GDB's x86_linux_prepare_to_resume.  An equivalent was
written for gdbserver and gdbserver's x86_linux_prepare_to_resume
was modified to use it.

gdb/ChangeLog:

	* x86-nat.h (x86_debug_reg_state): Move declaration to...
	* nat/x86-dregs.h (x86_debug_reg_state): New declaration.

gdb/gdbserver/ChangeLog:

	* linux-x86-low.c (x86_debug_reg_state): New function.
	(x86_linux_prepare_to_resume): Use the above.

1 files changed, 5 insertions, 0 deletions

diff --git a/gdb/nat/x86-dregs.h b/gdb/nat/x86-dregs.h
index a2b9926..61a97c8 100644
--- a/gdb/nat/x86-dregs.h
+++ b/gdb/nat/x86-dregs.h
@@ -92,6 +92,11 @@ struct x86_debug_reg_state
 #define ALL_DEBUG_ADDRESS_REGISTERS(i) \
   for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
 
+/* Return a pointer to the local mirror of the debug registers of
+   process PID.  This function must be provided by the client
+   if required.  */
+extern struct x86_debug_reg_state *x86_debug_reg_state (pid_t pid);
+
 /* Insert a watchpoint to watch a memory region which starts at
    address ADDR and whose length is LEN bytes.  Watch memory accesses
    of the type TYPE.  Return 0 on success, -1 on failure.  */