Add support for NetBSD threads in arm-nbsd-nat.c

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

gdb/ChangeLog:

	* arm-nbsd-nat.c (fetch_register): New variable lwp and pass
	it to the ptrace call.
	* arm-nbsd-nat.c (fetch_fp_register): Likewise.
	* arm-nbsd-nat.c (fetch_fp_regs): Likewise.
	* arm-nbsd-nat.c (store_register): Likewise.
	* arm-nbsd-nat.c (store_regs): Likewise.
	* arm-nbsd-nat.c (store_fp_register): Likewise.
	* arm-nbsd-nat.c (store_fp_regs): Likewise.

2 files changed, 28 insertions, 9 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 66ef062..10f52eb 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,16 @@
 2020-03-14  Kamil Rytarowski  <n54@gmx.com>
 
+	* arm-nbsd-nat.c (fetch_register): New variable lwp and pass
+	it to the ptrace call.
+	* arm-nbsd-nat.c (fetch_fp_register): Likewise.
+	* arm-nbsd-nat.c (fetch_fp_regs): Likewise.
+	* arm-nbsd-nat.c (store_register): Likewise.
+	* arm-nbsd-nat.c (store_regs): Likewise.
+	* arm-nbsd-nat.c (store_fp_register): Likewise.
+	* arm-nbsd-nat.c (store_fp_regs): Likewise.
+
+2020-03-14  Kamil Rytarowski  <n54@gmx.com>
+
 	* arm-nbsd-nat.c (arm_netbsd_nat_target): Inherit from
 	nbsd_nat_target instead of inf_ptrace_target.
 	* arm-nbsd-nat.c: Include "nbsd-nat.h", as we are now using
diff --git a/gdb/arm-nbsd-nat.c b/gdb/arm-nbsd-nat.c
index e7cd236..a8a67e6 100644
--- a/gdb/arm-nbsd-nat.c
+++ b/gdb/arm-nbsd-nat.c
@@ -66,9 +66,10 @@ fetch_register (struct regcache *regcache, int regno)
 {
   struct reg inferior_registers;
   int ret;
+  int lwp = regcache->ptid ().lwp ();
 
   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
-		(PTRACE_TYPE_ARG3) &inferior_registers, 0);
+		(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 
   if (ret < 0)
     {
@@ -83,8 +84,10 @@ static void
 fetch_fp_register (struct regcache *regcache, int regno)
 {
   struct fpreg inferior_fp_registers;
+  int lwp = regcache->ptid ().lwp ();
+
   int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
-		    (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
+		    (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
 
   struct vfpreg &vfp = inferior_fp_registers.fpr_vfp;
 
@@ -111,11 +114,12 @@ static void
 fetch_fp_regs (struct regcache *regcache)
 {
   struct fpreg inferior_fp_registers;
+  int lwp = regcache->ptid ().lwp ();
   int ret;
   int regno;
 
   ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
-		(PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
+		(PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
 
   if (ret < 0)
     {
@@ -149,10 +153,11 @@ store_register (const struct regcache *regcache, int regno)
 {
   struct gdbarch *gdbarch = regcache->arch ();
   struct reg inferior_registers;
+  int lwp = regcache->ptid ().lwp ();
   int ret;
 
   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
-		(PTRACE_TYPE_ARG3) &inferior_registers, 0);
+		(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 
   if (ret < 0)
     {
@@ -210,7 +215,7 @@ store_register (const struct regcache *regcache, int regno)
     }
 
   ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
-		(PTRACE_TYPE_ARG3) &inferior_registers, 0);
+		(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 
   if (ret < 0)
     warning (_("unable to write register %d to inferior"), regno);
@@ -221,6 +226,7 @@ store_regs (const struct regcache *regcache)
 {
   struct gdbarch *gdbarch = regcache->arch ();
   struct reg inferior_registers;
+  int lwp = regcache->ptid ().lwp ();
   int ret;
   int regno;
 
@@ -252,7 +258,7 @@ store_regs (const struct regcache *regcache)
     }
 
   ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
-		(PTRACE_TYPE_ARG3) &inferior_registers, 0);
+		(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 
   if (ret < 0)
     warning (_("unable to store general registers"));
@@ -262,8 +268,9 @@ static void
 store_fp_register (const struct regcache *regcache, int regno)
 {
   struct fpreg inferior_fp_registers;
+  int lwp = regcache->ptid ().lwp ();
   int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
-		    (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
+		    (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
   struct vfpreg &vfp = inferior_fp_registers.fpr_vfp;
 
   if (ret < 0)
@@ -285,7 +292,7 @@ store_fp_register (const struct regcache *regcache, int regno)
     warning (_("Invalid register number."));
 
   ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
-		(PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
+		(PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
 
   if (ret < 0)
     warning (_("unable to write register %d to inferior"), regno);
@@ -295,6 +302,7 @@ static void
 store_fp_regs (const struct regcache *regcache)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ());
+  int lwp = regcache->ptid ().lwp ();
   if (tdep->vfp_register_count == 0)
     return;
 
@@ -307,7 +315,7 @@ store_fp_regs (const struct regcache *regcache)
 			 (char *) &fpregs.fpr_vfp.vfp_fpscr);
 
   int ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
-		    (PTRACE_TYPE_ARG3) &fpregs, 0);
+		    (PTRACE_TYPE_ARG3) &fpregs, lwp);
 
   if (ret < 0)
     warning (_("unable to store floating-point registers"));