From 4339421da94cf8cdf9557a4b5ec307b870a9d362 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 2 Aug 2022 10:46:01 -0700
Subject: fbsd-nat: Add a have_register_set helper function.

This is similar to have_regset but is used for older register sets that
pre-date PT_GETREGSET and use separate fetch and store ptrace operations.
---
 gdb/fbsd-nat.c | 10 ++++++++++
 gdb/fbsd-nat.h | 14 ++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 32e8f77..9b2a7ed 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -1954,6 +1954,16 @@ fbsd_nat_target::supports_disable_randomization ()
 }
 
 /* See fbsd-nat.h.  */
+bool
+fbsd_nat_target::have_register_set (ptid_t ptid, int fetch_op, void *regs,
+				    size_t size)
+{
+  pid_t pid = get_ptrace_pid (ptid);
+
+  return ptrace (fetch_op, pid, (PTRACE_TYPE_ARG3) regs, 0) == 0;
+}
+
+/* See fbsd-nat.h.  */
 
 bool
 fbsd_nat_target::fetch_register_set (struct regcache *regcache, int regnum,
diff --git a/gdb/fbsd-nat.h b/gdb/fbsd-nat.h
index c0ab1be..b74be75 100644
--- a/gdb/fbsd-nat.h
+++ b/gdb/fbsd-nat.h
@@ -130,6 +130,13 @@ protected:
 private:
   ptid_t wait_1 (ptid_t, struct target_waitstatus *, target_wait_flags);
 
+  /* Helper routine for use in read_description in subclasses.  This
+     routine checks if the register set fetched via FETCH_OP is
+     present for a given PTID and returns a bool indicating success or
+     failure.  */
+
+  bool have_register_set (ptid_t ptid, int fetch_op, void *regs, size_t size);
+
   /* Helper routines for use in fetch_registers and store_registers in
      subclasses.  These routines fetch and store a single set of
      registers described by REGSET.  The REGSET's 'regmap' field must
@@ -171,6 +178,13 @@ protected:
      type such as 'struct reg' or 'struct fpreg'.  */
 
   template <class Regset>
+  bool have_register_set (ptid_t ptid, int fetch_op)
+  {
+    Regset regs;
+    return have_register_set (ptid, fetch_op, &regs, sizeof (regs));
+  }
+
+  template <class Regset>
   bool fetch_register_set (struct regcache *regcache, int regnum, int fetch_op,
 			   const struct regset *regset, int regbase = 0)
   {
-- 
cgit v1.1