[PowerPC] Add support for TAR

This patch adds support for the Target Address Register for powerpc
linux native and core file targets, and in the powerpc linux server
stub.

gdb/ChangeLog:
2018-10-26  Edjunior Barbosa Machado  <emachado@linux.vnet.ibm.com>
	    Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

	* arch/ppc-linux-tdesc.h (tdesc_powerpc_isa207_vsx32l)
	(tdesc_powerpc_isa207_vsx64l): Declare.
	* arch/ppc-linux-common.h (PPC_LINUX_SIZEOF_TARREGSET): Define.
	(struct ppc_linux_features) <isa207>: New field.
	(ppc_linux_no_features): Add initializer for isa207 field.
	* arch/ppc-linux-common.c (ppc_linux_match_description): Return
	new tdescs.
	* nat/ppc-linux.h (PPC_FEATURE2_ARCH_2_07, PPC_FEATURE2_TAR)
	(NT_PPC_TAR): Define if not already defined.
	* features/Makefile (WHICH): Add rs6000/powerpc-isa207-vsx32l and
	rs6000/powerpc-isa207-vsx64l.
	(XMLTOC): Add rs6000/powerpc-isa207-vsx32l.xml and
	rs6000/powerpc-isa207-vsx64l.xml.
	* features/rs6000/power-tar.xml: New file.
	* features/rs6000/powerpc-isa207-vsx32l.xml: New file.
	* features/rs6000/powerpc-isa207-vsx64l.xml: New file.
	* features/rs6000/powerpc-isa207-vsx32l.c: Generate.
	* features/rs6000/powerpc-isa207-vsx64l.c: Generate.
	* regformats/rs6000/powerpc-isa207-vsx32l.dat: Generate.
	* regformats/rs6000/powerpc-isa207-vsx64l.dat: Generate.
	* ppc-linux-nat.c (fetch_register, fetch_ppc_registers): Call
	fetch_regset with the TAR regset.
	(store_register, store_ppc_registers): Call store_regset with the
	TAR regset.
	(ppc_linux_nat_target::read_description): Set isa207 field in the
	features struct if needed.
	* ppc-linux-tdep.c: Include
	features/rs6000/powerpc-isa207-vsx32l.c and
	features/rs6000/powerpc-isa207-vsx64l.c.
	(ppc32_regmap_tar, ppc32_linux_tarregset): New globals.
	(ppc_linux_iterate_over_regset_sections): Call back with the tar
	regset.
	(ppc_linux_core_read_description): Check if the tar section is
	present and set isa207 in the features struct.
	(_initialize_ppc_linux_tdep): Call
	initialize_tdesc_powerpc_isa207_vsx32l and
	initialize_tdesc_powerpc_isa207_vsx64l.
	* ppc-linux-tdep.h (ppc32_linux_tarregset): Declare.
	* ppc-tdep.h (gdbarch_tdep) <ppc_tar_regnum>: New field.
	(enum) <PPC_TAR_REGNUM>: New enum value.
	* rs6000-tdep.c (rs6000_gdbarch_init): Look for and validate tar
	feature.
	(ppc_process_record_op31): Record changes to TAR.

gdb/gdbserver/ChangeLog:
2018-10-26  Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

	* configure.srv (ipa_ppc_linux_regobj): Add
	powerpc-isa207-vsx64l-ipa.o and powerpc-isa207-vsx32l-ipa.o.
	(powerpc*-*-linux*): Add powerpc-isa207-vsx32l.o and
	powerpc-isa207-vsx64l.o to srv_regobj, add rs6000/power-tar.xml,
	rs6000/powerpc-isa207-vsx32l.xml, and
	rs6000/powerpc-isa207-vsx64l.xml to srv_xmlfiles.
	* linux-ppc-tdesc-init.h (enum ppc_linux_tdesc)
	<PPC_TDESC_ISA207_VSX>: New enum value.
	(init_registers_powerpc_isa207_vsx32l): Declare.
	(init_registers_powerpc_isa207_vsx64l): Declare.
	* linux-ppc-low.c (ppc_fill_tarregset): New function.
	(ppc_store_tarregset): New function.
	(ppc_regsets): Add entry for the TAR regset.
	(ppc_arch_setup): Set isa207 in features struct when needed.  Set
	size for the TAR regsets.
	(ppc_get_ipa_tdesc_idx): Return PPC_TDESC_ISA207_VSX.
	(initialize_low_arch): Call init_registers_powerpc_isa207_vsx32l
	and init_registers_powerpc_isa207_vsx64l.
	* linux-ppc-ipa.c (get_ipa_tdesc): Handle PPC_TDESC_ISA207_VSX.
	(initialize_low_tracepoint): Call
	init_registers_powerpc_isa207_vsx32l and
	init_registers_powerpc_isa207_vsx64l.

gdb/testsuite/ChangeLog:
2018-10-26  Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

	* gdb.arch/powerpc-tar.c: New file.
	* gdb.arch/powerpc-tar.exp: New file.

gdb/doc/ChangeLog:
2018-10-26  Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

	* gdb.texinfo (PowerPC Features): Describe new feature
	"org.gnu.gdb.power.tar".

1 files changed, 32 insertions, 1 deletions

diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 13c00de..1d070dd 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -72,6 +72,7 @@
 #include "features/rs6000/powerpc-isa205-altivec32l.c"
 #include "features/rs6000/powerpc-isa205-vsx32l.c"
 #include "features/rs6000/powerpc-isa205-ppr-dscr-vsx32l.c"
+#include "features/rs6000/powerpc-isa207-vsx32l.c"
 #include "features/rs6000/powerpc-64l.c"
 #include "features/rs6000/powerpc-altivec64l.c"
 #include "features/rs6000/powerpc-cell64l.c"
@@ -80,6 +81,7 @@
 #include "features/rs6000/powerpc-isa205-altivec64l.c"
 #include "features/rs6000/powerpc-isa205-vsx64l.c"
 #include "features/rs6000/powerpc-isa205-ppr-dscr-vsx64l.c"
+#include "features/rs6000/powerpc-isa207-vsx64l.c"
 #include "features/rs6000/powerpc-e500l.c"
 
 /* Shared library operations for PowerPC-Linux.  */
@@ -581,6 +583,22 @@ const struct regset ppc32_linux_dscrregset = {
   regcache_collect_regset
 };
 
+/* Target Address Register regmap.  */
+
+static const struct regcache_map_entry ppc32_regmap_tar[] =
+  {
+      { 1, PPC_TAR_REGNUM, 8 },
+      { 0 }
+  };
+
+/* Target Address Register regset.  */
+
+const struct regset ppc32_linux_tarregset = {
+  ppc32_regmap_tar,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
+
 const struct regset *
 ppc_linux_gregset (int wordsize)
 {
@@ -621,6 +639,7 @@ ppc_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
   int have_vsx = tdep->ppc_vsr0_upper_regnum != -1;
   int have_ppr = tdep->ppc_ppr_regnum != -1;
   int have_dscr = tdep->ppc_dscr_regnum != -1;
+  int have_tar = tdep->ppc_tar_regnum != -1;
 
   if (tdep->wordsize == 4)
     cb (".reg", 48 * 4, 48 * 4, &ppc32_linux_gregset, NULL, cb_data);
@@ -650,6 +669,11 @@ ppc_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
 	PPC_LINUX_SIZEOF_DSCRREGSET,
 	&ppc32_linux_dscrregset, "Data Stream Control Register",
 	cb_data);
+
+  if (have_tar)
+    cb (".reg-ppc-tar", PPC_LINUX_SIZEOF_TARREGSET,
+	PPC_LINUX_SIZEOF_TARREGSET,
+	&ppc32_linux_tarregset, "Target Address Register", cb_data);
 }
 
 static void
@@ -1063,6 +1087,7 @@ ppc_linux_core_read_description (struct gdbarch *gdbarch,
   asection *section = bfd_get_section_by_name (abfd, ".reg");
   asection *ppr = bfd_get_section_by_name (abfd, ".reg-ppc-ppr");
   asection *dscr = bfd_get_section_by_name (abfd, ".reg-ppc-dscr");
+  asection *tar = bfd_get_section_by_name (abfd, ".reg-ppc-tar");
 
   if (! section)
     return NULL;
@@ -1096,7 +1121,11 @@ ppc_linux_core_read_description (struct gdbarch *gdbarch,
   features.isa205 = ppc_linux_has_isa205 (hwcap);
 
   if (ppr && dscr)
-    features.ppr_dscr = true;
+    {
+      features.ppr_dscr = true;
+      if (tar)
+	features.isa207 = true;
+    }
 
   return ppc_linux_match_description (features);
 }
@@ -1972,6 +2001,7 @@ _initialize_ppc_linux_tdep (void)
   initialize_tdesc_powerpc_isa205_altivec32l ();
   initialize_tdesc_powerpc_isa205_vsx32l ();
   initialize_tdesc_powerpc_isa205_ppr_dscr_vsx32l ();
+  initialize_tdesc_powerpc_isa207_vsx32l ();
   initialize_tdesc_powerpc_64l ();
   initialize_tdesc_powerpc_altivec64l ();
   initialize_tdesc_powerpc_cell64l ();
@@ -1980,5 +2010,6 @@ _initialize_ppc_linux_tdep (void)
   initialize_tdesc_powerpc_isa205_altivec64l ();
   initialize_tdesc_powerpc_isa205_vsx64l ();
   initialize_tdesc_powerpc_isa205_ppr_dscr_vsx64l ();
+  initialize_tdesc_powerpc_isa207_vsx64l ();
   initialize_tdesc_powerpc_e500l ();
 }