gdb/

	* features/mips-dsp.xml: New file.
	* features/mips64-dsp.xml: New file.
	* features/mips-dsp-linux.xml: New file.
	* features/mips64-dsp-linux.xml: New file.
	* features/Makefile (WHICH): Add mips-dsp-linux and
	mips64-dsp-linux.
	(mips-dsp-expedite, mips64-dsp-expedite): New variables.
	* features/mips-dsp-linux.c: New file.
	* features/mips64-dsp-linux.c: New file.
	* regformats/mips-dsp-linux.dat: New file.
	* regformats/mips64-dsp-linux.dat: New file.
	* mips-linux-nat.c (mips_linux_register_addr): Handle DSP
	registers.
	(mips64_linux_register_addr): Likewise.
	(mips64_linux_regsets_fetch_registers): Likewise.
	(mips64_linux_regsets_store_registers): Likewise.
	(mips64_linux_fetch_registers): Update call to
	mips64_linux_regsets_fetch_registers.
	(mips64_linux_store_registers): Update call to
	mips64_linux_regsets_store_registers.
	(mips_linux_read_description): Probe for DSP registers.
	(_initialize_mips_linux_nat): Call initialize_tdesc_mips_dsp_linux
	and initialize_tdesc_mips64_dsp_linux.
	* mips-linux-tdep.c (supply_gregset, mips64_supply_gregset):
	Remove padding of no longer used embedded register slots.
	* mips-linux-tdep.h (DSP_BASE, DSP_CONTROL): New macros.
	(MIPS_RESTART_REGNUM): Redefine enum value.
	* mips-tdep.c (mips_generic_reg_names): Remove trailing null
	strings.
	(mips_tx39_reg_names): Likewise.
	(mips_linux_reg_names): New array of register names for Linux
	targets.
	(mips_register_name): Check for a null pointer in
	mips_processor_reg_names and return an empty string.
	(mips_register_type): Exclude embedded registers for the IRIX
	and Linux ABIs.
	(mips_pseudo_register_type): Likewise.  Use dynamic numbers to
	refer to FP registers, LO, HI, BadVAddr, Cause and PC.  Handle
	DSP registers.
	(mips_stab_reg_to_regnum): Handle DSP accumulators.
	(mips_dwarf_dwarf2_ecoff_reg_to_regnum): Likewise.
	(mips_gdbarch_init): Likewise.  Initialize internal register
	indices for the Linux ABI.  Use dynamic numbers to refer to
	registers, as applicable, while parsing the target description.
	* mips-tdep.h (struct mips_regnum): Add dspacc/dspctl offsets.

	gdb/doc/
	* gdb.texinfo (MIPS Features): Add org.gnu.gdb.mips.dsp.

	gdb/gdbserver/
	* linux-low.h (linux_target_ops): Add regset_bitmap member.
	* linux-low.c (use_linux_regsets): New macro.
	[!HAVE_LINUX_REGSETS] (regsets_fetch_inferior_registers): Likewise.
	[!HAVE_LINUX_REGSETS] (regsets_store_inferior_registers): Likewise.
	(linux_register_in_regsets): New function.
	(usr_fetch_inferior_registers): Skip registers covered by
	regsets.
	(usr_store_inferior_registers): Likewise.
	(usr_fetch_inferior_registers): New macro.
	(usr_store_inferior_registers): Likewise.
	(linux_fetch_registers): Handle mixed regset/non-regset targets.
	(linux_store_registers): Likewise.
	* linux-mips-low.c (init_registers_mips_dsp_linux): New
	prototype.
	(init_registers_mips64_dsp_linux): Likewise.
	(init_registers_mips_linux): New macro.
	(init_registers_mips_dsp_linux): Likewise.
	(mips_dsp_num_regs): Likewise.
	(DSP_BASE, DSP_CONTROL): New fallback macros.
	(mips_base_regs): New macro.
	(mips_regmap): Use it.  Fix the size.
	(mips_dsp_regmap): New variable.
	(mips_dsp_regset_bitmap): Likewise.
	(mips_arch_setup): New function.
	(mips_cannot_fetch_register): Use the_low_target.regmap rather
	than mips_regmap.
	(mips_cannot_store_register): Likewise.
	(the_low_target): Update .arch_setup, .num_regs and .regmap
	initializers.  Add .regset_bitmap initializer.
	* linux-arm-low.c (the_low_target): Add .regset_bitmap
	initializer.
	* linux-bfin-low.c (the_low_target): Likewise.
	* linux-cris-low.c (the_low_target): Likewise.
	* linux-crisv32-low.c (the_low_target): Likewise.
	* linux-ia64-low.c (the_low_target): Likewise.
	* linux-m32r-low.c (the_low_target): Likewise.
	* linux-m68k-low.c (the_low_target): Likewise.
	* linux-ppc-low.c (the_low_target): Likewise.
	* linux-s390-low.c (the_low_target): Likewise.
	* linux-sh-low.c (the_low_target): Likewise.
	* linux-sparc-low.c (the_low_target): Likewise.
	* linux-tic6x-low.c (the_low_target): Likewise.
	* linux-x86-low.c (the_low_target): Likewise.
	* linux-xtensa-low.c (the_low_target): Likewise.
	* configure.srv <mips*-*-linux*>: Add mips-dsp-linux.o and
	mips64-dsp-linux.o to srv_regobj.  Add mips-dsp-linux.xml,
	mips64-dsp-linux.xml, mips-dsp.xml and mips64-dsp.xml to
	srv_xmlfiles.
	* Makefile.in (mips-dsp-linux.o, mips-dsp-linux.c): New targets.
	(mips64-dsp-linux.o, mips64-dsp-linux.c): Likewise.

	gdb/testsuite/
	* gdb.xml/tdesc-regs.exp: Add "mips-dsp.xml" to the list of MIPS
	core registers.

1 files changed, 94 insertions, 25 deletions

diff --git a/gdb/gdbserver/linux-mips-low.c b/gdb/gdbserver/linux-mips-low.c
index 1fb62377a32..1f584425a14 100644
--- a/gdb/gdbserver/linux-mips-low.c
+++ b/gdb/gdbserver/linux-mips-low.c
@@ -27,8 +27,17 @@
 
 /* Defined in auto-generated file mips-linux.c.  */
 void init_registers_mips_linux (void);
+/* Defined in auto-generated file mips-dsp-linux.c.  */
+void init_registers_mips_dsp_linux (void);
 /* Defined in auto-generated file mips64-linux.c.  */
 void init_registers_mips64_linux (void);
+/* Defined in auto-generated file mips64-dsp-linux.c.  */
+void init_registers_mips64_dsp_linux (void);
+
+#ifdef __mips64
+#define init_registers_mips_linux init_registers_mips64_linux
+#define init_registers_mips_dsp_linux init_registers_mips64_dsp_linux
+#endif
 
 #ifndef PTRACE_GET_THREAD_AREA
 #define PTRACE_GET_THREAD_AREA 25
@@ -39,9 +48,15 @@ void init_registers_mips64_linux (void);
 #endif
 
 #define mips_num_regs 73
+#define mips_dsp_num_regs 80
 
 #include <asm/ptrace.h>
 
+#ifndef DSP_BASE
+#define DSP_BASE 71
+#define DSP_CONTROL 77
+#endif
+
 union mips_register
 {
   unsigned char buf[8];
@@ -53,27 +68,84 @@ union mips_register
 
 /* Return the ptrace ``address'' of register REGNO. */
 
-static int mips_regmap[] = {
-  -1,  1,  2,  3,  4,  5,  6,  7,
-  8,  9,  10, 11, 12, 13, 14, 15,
-  16, 17, 18, 19, 20, 21, 22, 23,
-  24, 25, 26, 27, 28, 29, 30, 31,
+#define mips_base_regs							\
+  -1,  1,  2,  3,  4,  5,  6,  7,					\
+  8,  9,  10, 11, 12, 13, 14, 15,					\
+  16, 17, 18, 19, 20, 21, 22, 23,					\
+  24, 25, 26, 27, 28, 29, 30, 31,					\
+									\
+  -1, MMLO, MMHI, BADVADDR, CAUSE, PC,					\
+									\
+  FPR_BASE,      FPR_BASE + 1,  FPR_BASE + 2,  FPR_BASE + 3,		\
+  FPR_BASE + 4,  FPR_BASE + 5,  FPR_BASE + 6,  FPR_BASE + 7,		\
+  FPR_BASE + 8,  FPR_BASE + 9,  FPR_BASE + 10, FPR_BASE + 11,		\
+  FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,		\
+  FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,		\
+  FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,		\
+  FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,		\
+  FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,		\
+  FPC_CSR, FPC_EIR
+
+#define mips_dsp_regs							\
+  DSP_BASE,      DSP_BASE + 1,  DSP_BASE + 2,  DSP_BASE + 3,		\
+  DSP_BASE + 4,  DSP_BASE + 5,						\
+  DSP_CONTROL
+
+static int mips_regmap[mips_num_regs] = {
+  mips_base_regs,
+  0
+};
 
-  -1, MMLO, MMHI, BADVADDR, CAUSE, PC,
+static int mips_dsp_regmap[mips_dsp_num_regs] = {
+  mips_base_regs,
+  mips_dsp_regs,
+  0
+};
 
-  FPR_BASE,      FPR_BASE + 1,  FPR_BASE + 2,  FPR_BASE + 3,
-  FPR_BASE + 4,  FPR_BASE + 5,  FPR_BASE + 6,  FPR_BASE + 7,
-  FPR_BASE + 8,  FPR_BASE + 9,  FPR_BASE + 10, FPR_BASE + 11,
-  FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,
-  FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,
-  FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,
-  FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,
-  FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
-  FPC_CSR, FPC_EIR,
+/* DSP registers are not in any regset and can only be accessed
+   individually.  */
 
-  0
+static unsigned char mips_dsp_regset_bitmap[(mips_dsp_num_regs + 7) / 8] = {
+  0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x80
 };
 
+/* Try peeking at an arbitrarily chosen DSP register and pick the available
+   user register set accordingly.  */
+
+static void
+mips_arch_setup (void)
+{
+  static void (*init_registers) (void);
+
+  gdb_assert (current_inferior);
+
+  if (init_registers == NULL)
+    {
+      int pid = lwpid_of (get_thread_lwp (current_inferior));
+
+      ptrace (PTRACE_PEEKUSER, pid, DSP_CONTROL, 0);
+      switch (errno)
+	{
+	case 0:
+	  the_low_target.num_regs = mips_dsp_num_regs;
+	  the_low_target.regmap = mips_dsp_regmap;
+	  the_low_target.regset_bitmap = mips_dsp_regset_bitmap;
+	  init_registers = init_registers_mips_dsp_linux;
+	  break;
+	case EIO:
+	  the_low_target.num_regs = mips_num_regs;
+	  the_low_target.regmap = mips_regmap;
+	  the_low_target.regset_bitmap = NULL;
+	  init_registers = init_registers_mips_linux;
+	  break;
+	default:
+	  perror_with_name ("ptrace");
+	  break;
+	}
+    }
+  init_registers ();
+}
+
 /* From mips-linux-nat.c.  */
 
 /* Pseudo registers can not be read.  ptrace does not provide a way to
@@ -84,7 +156,7 @@ static int mips_regmap[] = {
 static int
 mips_cannot_fetch_register (int regno)
 {
-  if (mips_regmap[regno] == -1)
+  if (the_low_target.regmap[regno] == -1)
     return 1;
 
   if (find_regno ("r0") == regno)
@@ -96,7 +168,7 @@ mips_cannot_fetch_register (int regno)
 static int
 mips_cannot_store_register (int regno)
 {
-  if (mips_regmap[regno] == -1)
+  if (the_low_target.regmap[regno] == -1)
     return 1;
 
   if (find_regno ("r0") == regno)
@@ -352,13 +424,10 @@ struct regset_info target_regsets[] = {
 };
 
 struct linux_target_ops the_low_target = {
-#ifdef __mips64
-  init_registers_mips64_linux,
-#else
-  init_registers_mips_linux,
-#endif
-  mips_num_regs,
-  mips_regmap,
+  mips_arch_setup,
+  -1,
+  NULL,
+  NULL,
   mips_cannot_fetch_register,
   mips_cannot_store_register,
   mips_get_pc,