PPC64: Fix gdb.arch/ppc64-atomic-inst.exp with displaced stepping

[deliverable/binutils-gdb.git] / gdb / gdbarch.h

diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index d714281b8372f78ff505dc36af935afd439ea662..c1e2c1ab3e6d304e0efb6ae425388e8b494d16cb 100644 (file)
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -923,7 +923,11 @@ extern void set_gdbarch_max_insn_length (struct gdbarch *gdbarch, ULONGEST max_i
   
    If your architecture doesn't need to adjust instructions before
    single-stepping them, consider using simple_displaced_step_copy_insn
-   here. */
+   here.
+
+   If the instruction cannot execute out of line, return NULL.  The
+   core falls back to stepping past the instruction in-line instead in
+   that case. */
 
 extern int gdbarch_displaced_step_copy_insn_p (struct gdbarch *gdbarch);