[PATCH 6/6] Fetch and store VFP registers by PTRACE_{G,S}ETREGSET

[Yao Qi <qiyaoltc@gmail.com>]

This patch is to use PTRACE_{G,S}ETREGSET to fetch and store VFP
registers if kernel supports.

gdb:

2015-05-28  Yao Qi  <yao.qi@linaro.org>

	* arm-linux-nat.c (fetch_vfp_regs): Use PTRACE_GETREGSET.
	(store_vfp_regs): Use PTRACE_SETREGSET.
---
 gdb/arm-linux-nat.c | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c
index b74767c..dd24ef6 100644
--- a/gdb/arm-linux-nat.c
+++ b/gdb/arm-linux-nat.c
@@ -591,7 +591,17 @@ fetch_vfp_regs (struct regcache *regcache)
   /* Get the thread id for the ptrace call.  */
   tid = GET_THREAD_ID (inferior_ptid);
 
-  ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
+  if (have_ptrace_getregset == 1)
+    {
+      struct iovec iov;
+
+      iov.iov_base = regbuf;
+      iov.iov_len = VFP_REGS_SIZE;
+      ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iov);
+    }
+  else
+    ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
+
   if (ret < 0)
     {
       warning (_("Unable to fetch VFP registers."));
@@ -617,7 +627,17 @@ store_vfp_regs (const struct regcache *regcache)
   /* Get the thread id for the ptrace call.  */
   tid = GET_THREAD_ID (inferior_ptid);
 
-  ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
+  if (have_ptrace_getregset == 1)
+    {
+      struct iovec iov;
+
+      iov.iov_base = regbuf;
+      iov.iov_len = VFP_REGS_SIZE;
+      ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iov);
+    }
+  else
+    ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
+
   if (ret < 0)
     {
       warning (_("Unable to fetch VFP registers (for update)."));
@@ -631,7 +651,16 @@ store_vfp_regs (const struct regcache *regcache)
   regcache_raw_collect (regcache, ARM_FPSCR_REGNUM,
 			(char *) regbuf + 32 * 8);
 
-  ret = ptrace (PTRACE_SETVFPREGS, tid, 0, regbuf);
+  if (have_ptrace_getregset == 1)
+    {
+      struct iovec iov;
+
+      iov.iov_base = regbuf;
+      iov.iov_len = VFP_REGS_SIZE;
+      ret = ptrace (PTRACE_SETREGSET, tid, NT_ARM_VFP, &iov);
+    }
+  else
+    ret = ptrace (PTRACE_SETVFPREGS, tid, 0, regbuf);
 
   if (ret < 0)
     {
-- 
1.9.1