From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 2 Aug 2022 17:46:01 +0000 (-0700)
Subject: fbsd-nat: Add a have_register_set helper function.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4339421da94cf8cdf9557a4b5ec307b870a9d362;p=thirdparty%2Fbinutils-gdb.git

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.
---

diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 32e8f77ead7..9b2a7eda647 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -1953,6 +1953,16 @@ fbsd_nat_target::supports_disable_randomization ()
 #endif
 }
 
+/* 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
diff --git a/gdb/fbsd-nat.h b/gdb/fbsd-nat.h
index c0ab1be5d58..b74be75d66c 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
@@ -170,6 +177,13 @@ protected:
   /* Wrapper versions of the above helpers which accept a register set
      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)