* NEWS: Mention ARM VFP support.

	* target-descriptions.c (tdesc_register_type): Make public.
	(tdesc_unnumbered_register): New function.
	(tdesc_register_reggroup_p): Allow missing
	pseudo_register_reggroup_p.
	* target-descriptions.h (tdesc_register_type): Declare.
	(tdesc_unnumbered_register): Declare.
	* arm-tdep.c (arm_neon_quad_read, arm_neon_quad_write): New functions.
	(arm_push_dummy_call): Use arm_neon_quad_write.
	(arm_neon_double_type, arm_neon_quad_type): New functions.
	(arm_register_type): Handle VFP and NEON registers.  Override the
	types of double-precision registers for NEON.  Disable FPA registers
	if they are not present.
	(arm_dwarf_reg_to_regnum): Add current VFP and NEON register numbers.
	(arm_return_value): Use arm_neon_quad_write and arm_neon_quad_read.
	(arm_register_name): Handle VFP single and NEON quad registers.
	(arm_pseudo_read, arm_pseudo_write): New functions.
	(arm_gdbarch_init): Check for VFP and NEON in the target description.
	Assign numbers to double-precision registers.  Register VFP and NEON
	pseudo registers.  Remove a shadowed "i" variable.
	* arm-tdep.h (enum gdb_regnum): Add ARM_D0_REGNUM and
	ARM_D31_REGNUM.
	(struct gdbarch_tdep): Add have_neon_pseudos, have_neon,
	have_vfp_registers, have_vfp_pseudos, neon_double_type,
	and neon_quad_type.

	* features/Makefile: Make expedite settings only architecture
	specific.
	(WHICH): Add new ARM descriptions.
	* features/arm-with-neon.xml, features/arm-with-vfpv2.c,
	features/arm-with-vfpv3.c, features/arm-vfpv2.xml,
	features/arm-vfpv3.xml, features/arm-with-vfpv2.xml,
	features/arm-with-vfpv3.xml, features/arm-with-neon.c: New files.
	* regformats/arm-with-neon.dat, regformats/arm-with-vfpv2.dat,
	regformats/arm-with-vfpv3.dat: Generate.

	doc/
	* gdb.texinfo (ARM Features): Document org.gnu.gdb.arm.vfp and
	org.gnu.gdb.arm.neon.

	gdbserver/
	* linux-low.c (linux_write_memory): Update debugging output.
	* Makefile.in (clean): Add new descriptions.
	(arm-with-vfpv2.o, arm-with-vfpv2.c, arm-with-vfpv3.o)
	(arm-with-vfpv3.c, arm-with-neon.o, arm-with-neon.c): New rules.
	* configure.srv: Add new files for arm*-*-linux*.
	* linux-arm-low.c: Add new declarations.
	(PTRACE_GETVFPREGS, PTRACE_SETVFPREGS): Define if undefined.
	(arm_hwcap, HWCAP_VFP, HWCAP_IWMMXT, HWCAP_NEON, HWCAP_VFPv3)
	(HWCAP_VFPv3D16): New.
	(arm_fill_wmmxregset, arm_store_wmmxregset): Check HWCAP_IWMMXT
	instead of __IWMMXT__.
	(arm_fill_vfpregset, arm_store_vfpregset, arm_get_hwcap)
	(arm_arch_setup): New.
	(target_regsets): Remove #ifdef.  Add VFP regset.
	(the_low_target): Use arm_arch_setup.

	testsuite/
	* gdb.base/float.exp: Handle VFP registers.

1 files changed, 141 insertions, 12 deletions

diff --git a/gdb/gdbserver/linux-arm-low.c b/gdb/gdbserver/linux-arm-low.c
index 70597fc2aab..d47ee977311 100644
--- a/gdb/gdbserver/linux-arm-low.c
+++ b/gdb/gdbserver/linux-arm-low.c
@@ -20,14 +20,17 @@
 #include "server.h"
 #include "linux-low.h"
 
+#include <elf.h>
 #include <sys/ptrace.h>
 
 #include "gdb_proc_service.h"
 
-/* Defined in auto-generated file reg-arm.c.  */
+/* Defined in auto-generated files.  */
 void init_registers_arm (void);
-/* Defined in auto-generated file arm-with-iwmmxt.c.  */
 void init_registers_arm_with_iwmmxt (void);
+void init_registers_arm_with_vfpv2 (void);
+void init_registers_arm_with_vfpv3 (void);
+void init_registers_arm_with_neon (void);
 
 #ifndef PTRACE_GET_THREAD_AREA
 #define PTRACE_GET_THREAD_AREA 22
@@ -38,6 +41,20 @@ void init_registers_arm_with_iwmmxt (void);
 # define PTRACE_SETWMMXREGS 19
 #endif
 
+#ifndef PTRACE_GETVFPREGS
+# define PTRACE_GETVFPREGS 27
+# define PTRACE_SETVFPREGS 28
+#endif
+
+static unsigned long arm_hwcap;
+
+/* These are in <asm/elf.h> in current kernels.  */
+#define HWCAP_VFP       64
+#define HWCAP_IWMMXT    512
+#define HWCAP_NEON      4096
+#define HWCAP_VFPv3     8192
+#define HWCAP_VFPv3D16  16384
+
 #ifdef HAVE_SYS_REG_H
 #include <sys/reg.h>
 #endif
@@ -87,13 +104,14 @@ arm_store_gregset (const void *buf)
       supply_register (i, zerobuf);
 }
 
-#ifdef __IWMMXT__
-
 static void
 arm_fill_wmmxregset (void *buf)
 {
   int i;
 
+  if (!(arm_hwcap & HWCAP_IWMMXT))
+    return;
+
   for (i = 0; i < 16; i++)
     collect_register (arm_num_regs + i, (char *) buf + i * 8);
 
@@ -107,6 +125,9 @@ arm_store_wmmxregset (const void *buf)
 {
   int i;
 
+  if (!(arm_hwcap & HWCAP_IWMMXT))
+    return;
+
   for (i = 0; i < 16; i++)
     supply_register (arm_num_regs + i, (char *) buf + i * 8);
 
@@ -115,7 +136,45 @@ arm_store_wmmxregset (const void *buf)
     supply_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);
 }
 
-#endif /* __IWMMXT__ */
+static void
+arm_fill_vfpregset (void *buf)
+{
+  int i, num, base;
+
+  if (!(arm_hwcap & HWCAP_VFP))
+    return;
+
+  if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
+    num = 32;
+  else
+    num = 16;
+
+  base = find_regno ("d0");
+  for (i = 0; i < num; i++)
+    collect_register (base + i, (char *) buf + i * 8);
+
+  collect_register_by_name ("fpscr", (char *) buf + 32 * 8);
+}
+
+static void
+arm_store_vfpregset (const void *buf)
+{
+  int i, num, base;
+
+  if (!(arm_hwcap & HWCAP_VFP))
+    return;
+
+  if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
+    num = 32;
+  else
+    num = 16;
+
+  base = find_regno ("d0");
+  for (i = 0; i < num; i++)
+    supply_register (base + i, (char *) buf + i * 8);
+
+  supply_register_by_name ("fpscr", (char *) buf + 32 * 8);
+}
 
 extern int debug_threads;
 
@@ -208,24 +267,94 @@ ps_get_thread_area (const struct ps_prochandle *ph,
   return PS_OK;
 }
 
+static int
+arm_get_hwcap (unsigned long *valp)
+{
+  unsigned char *data = alloca (8);
+  int offset = 0;
+
+  while ((*the_target->read_auxv) (offset, data, 8) == 8)
+    {
+      unsigned int *data_p = (unsigned int *)data;
+      if (data_p[0] == AT_HWCAP)
+	{
+	  *valp = data_p[1];
+	  return 1;
+	}
+
+      offset += 8;
+    }
+
+  *valp = 0;
+  return 0;
+}
+
+static void
+arm_arch_setup (void)
+{
+  arm_hwcap = 0;
+  if (arm_get_hwcap (&arm_hwcap) == 0)
+    {
+      init_registers_arm ();
+      return;
+    }
+
+  if (arm_hwcap & HWCAP_IWMMXT)
+    {
+      init_registers_arm_with_iwmmxt ();
+      return;
+    }
+
+  if (arm_hwcap & HWCAP_VFP)
+    {
+      int pid;
+      char *buf;
+
+      /* NEON implies either no VFP, or VFPv3-D32.  We only support
+	 it with VFP.  */
+      if (arm_hwcap & HWCAP_NEON)
+	init_registers_arm_with_neon ();
+      else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
+	init_registers_arm_with_vfpv3 ();
+      else
+	init_registers_arm_with_vfpv2 ();
+
+      /* Now make sure that the kernel supports reading these
+	 registers.  Support was added in 2.6.30.  */
+      pid = lwpid_of (get_thread_lwp (current_inferior));
+      errno = 0;
+      buf = malloc (32 * 8 + 4);
+      if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
+	  && errno == EIO)
+	{
+	  arm_hwcap = 0;
+	  init_registers_arm ();
+	}
+      free (buf);
+
+      return;
+    }
+
+  /* The default configuration uses legacy FPA registers, probably
+     simulated.  */
+  init_registers_arm ();
+}
+
 struct regset_info target_regsets[] = {
   { PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4,
     GENERAL_REGS,
     arm_fill_gregset, arm_store_gregset },
-#ifdef __IWMMXT__
   { PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4,
     EXTENDED_REGS,
     arm_fill_wmmxregset, arm_store_wmmxregset },
-#endif
+  { PTRACE_GETVFPREGS, PTRACE_SETVFPREGS, 32 * 8 + 4,
+    EXTENDED_REGS,
+    arm_fill_vfpregset, arm_store_vfpregset },
   { 0, 0, -1, -1, NULL, NULL }
 };
 
 struct linux_target_ops the_low_target = {
-#ifdef __IWMMXT__
-  init_registers_arm_with_iwmmxt,
-#else
-  init_registers_arm,
-#endif
+  arm_arch_setup,
   arm_num_regs,
   arm_regmap,
   arm_cannot_fetch_register,