[src/trunk]: src/sys/arch/arm/include Obsolete PT_STEP and friends, that have...

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

details:   https://anonhg.NetBSD.org/src/rev/e6ff3fb07595
branches:  trunk
changeset: 979113:e6ff3fb07595
user:      rin <rin%NetBSD.org@localhost>
date:      Mon Dec 14 01:58:48 2020 +0000

description:
Obsolete PT_STEP and friends, that have never been implemented.

PT_STEP was exposed to userland for NetBSD 1.6 to 9, and
PT_SETSTEP and PT_CLEARSTEP was for 8 to 9. Therefore, they cannot be
reused for other purposes.

PT_STEP was introduced to arm/ptrace.h rev 1.2:

http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/arm/include/ptrace.h#rev1.2

This was for workaround against GDB, which assumes PT_STEP is 9 (even
today!!), if it is undefined. But, this should have been dealt with
differently...

diffstat:

 sys/arch/arm/include/ptrace.h |  14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diffs (46 lines):

diff -r dab449ef9af3 -r e6ff3fb07595 sys/arch/arm/include/ptrace.h
--- a/sys/arch/arm/include/ptrace.h     Sun Dec 13 21:55:25 2020 +0000
+++ b/sys/arch/arm/include/ptrace.h     Mon Dec 14 01:58:48 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ptrace.h,v 1.16 2020/12/01 02:48:29 rin Exp $  */
+/*     $NetBSD: ptrace.h,v 1.17 2020/12/14 01:58:48 rin Exp $  */
 
 /*
  * Copyright (c) 1995 Frank Lancaster
@@ -36,7 +36,8 @@
 /*
  * arm-dependent ptrace definitions
  */
-#ifndef _KERNEL
+#if 0
+/* Exposed to userland for NetBSD 1.6 to 9. Do not reuse for other purpose. */
 #define PT_STEP                (PT_FIRSTMACH + 0) /* Not implemented */
 #endif
 #define        PT_GETREGS      (PT_FIRSTMACH + 1)
@@ -44,21 +45,22 @@
 /* 3 and 4 are for FPE registers */
 #define        PT_GETFPREGS    (PT_FIRSTMACH + 5)
 #define        PT_SETFPREGS    (PT_FIRSTMACH + 6)
-#ifndef _KERNEL
+#if 0
+/* Exposed to userland for NetBSD 8 to 9. Do not reuse for other purpose. */
 #define PT_SETSTEP     (PT_FIRSTMACH + 7) /* Not implemented */
 #define PT_CLEARSTEP   (PT_FIRSTMACH + 8) /* Not implemented */
 #endif
 
 #define PT_MACHDEP_STRINGS \
-       "PT_STEP", \
+       "n/a PT_STEP", \
        "PT_GETREGS", \
        "PT_SETREGS", \
        "old PT_GETFPREGS", \
        "old PT_SETFPREGS", \
        "PT_GETFPREGS", \
        "PT_SETFPREGS", \
-       "PT_SETSTEP", \
-       "PT_CLEARSTEP",
+       "n/a PT_SETSTEP", \
+       "n/a PT_CLEARSTEP",
 
 #include <machine/reg.h>
 #define PTRACE_REG_PC(_r)              (_r)->r_pc