[src/trunk]: src/external/gpl3/gdb/dist/gdb Add some precautions for platform...

[rin <rin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fefa9920bbdb
branches:  trunk
changeset: 979115:fefa9920bbdb
user:      rin <rin%NetBSD.org@localhost>
date:      Mon Dec 14 02:05:07 2020 +0000

description:
Add some precautions for platforms without PT_STEP support.

"nat/gdb_ptrace.h" defines PT_STEP as 9, if it is not defined. nat-ptrace.c
depends on this; inf_ptrace_target::resume() uses PT_STEP unconditionally
when its ``step'' argument is non-zero. Therefore,

- Add comment that nbsd-nat.c should include <sys/ptrace.h> directly,
  instead of "nat/gdb_ptrace.h".

- Add gdb_assert(step == 0) in nbsd_nat_target::resume() ifndef PT_STEP,
  before calling inf_ptrace_target::resume().

diffstat:

 external/gpl3/gdb/dist/gdb/nbsd-nat.c |  4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diffs (21 lines):

diff -r 2e48dbce5e50 -r fefa9920bbdb external/gpl3/gdb/dist/gdb/nbsd-nat.c
--- a/external/gpl3/gdb/dist/gdb/nbsd-nat.c     Mon Dec 14 02:01:03 2020 +0000
+++ b/external/gpl3/gdb/dist/gdb/nbsd-nat.c     Mon Dec 14 02:05:07 2020 +0000
@@ -27,6 +27,9 @@
 #include "gdbarch.h"
 
 #include <sys/types.h>
+/* Use <sys/ptrace.h> directly, instead of "nat/gdb_ptrace.h".  Otherwise,
+   PT_STEP will be defined unintentionally, which breaks platforms without
+   PT_STEP support.  */
 #include <sys/ptrace.h>
 #include <sys/sysctl.h>
 #include <sys/wait.h>
@@ -539,6 +542,7 @@
        nbsd_resume (this, ptid_t (inf->pid, 0, 0), step, signal);
     }
 #else
+    gdb_assert(step == 0);
     if (ptid.pid () == -1)
       ptid = inferior_ptid;
     inf_ptrace_target::resume (ptid, step, signal);