[PATCH] Add support for NetBSD threads in sparc-nat.c

[Kamil Rytarowski <n54@gmx.com>]

NetBSD ptrace(2) accepts thread id (LWP) as the 4th argument for threads.

This file is still shared with other targets that use different 4th argument
type.
---
 gdb/sparc-nat.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/gdb/sparc-nat.c b/gdb/sparc-nat.c
index dff0f521565..1e890bd8613 100644
--- a/gdb/sparc-nat.c
+++ b/gdb/sparc-nat.c
@@ -154,6 +154,12 @@ sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
      registers can be written.  */
   pid = get_ptrace_pid (regcache->ptid ());

+#ifdef __NetBSD__
+# define lwp regcache->ptid ().lwp ()
+#else
+# define lwp (PTRACE_TYPE_ARG4) 0
+#endif
+
   if (regnum == SPARC_G0_REGNUM)
     {
       gdb_byte zero[8] = { 0 };
@@ -166,7 +172,7 @@ sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
     {
       gregset_t regs;

-      if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+      if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, lwp) == -1)
 	perror_with_name (_("Couldn't get registers"));

       sparc_supply_gregset (sparc_gregmap, regcache, -1, &regs);
@@ -178,11 +184,13 @@ sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
     {
       fpregset_t fpregs;

-      if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+      if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
 	perror_with_name (_("Couldn't get floating point status"));

       sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs);
     }
+
+#undef lwp
 }

 void
@@ -195,6 +203,12 @@ sparc_store_inferior_registers (struct regcache *regcache, int regnum)
      about threaded assumptions.  */
   pid = get_ptrace_pid (regcache->ptid ());

+#ifdef __NetBSD__
+# define lwp regcache->ptid ().lwp ()
+#else
+# define lwp (PTRACE_TYPE_ARG4) 0
+#endif
+
   if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
     {
       gregset_t regs;
@@ -245,6 +259,7 @@ sparc_store_inferior_registers (struct regcache *regcache, int regnum)
       if (regnum != -1)
 	return;
     }
+#undef lwp
 }

 \f
--
2.25.0