[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".

3 files changed, 9 insertions, 2 deletions

diff --git a/gdb/arch/ppc-linux-common.c b/gdb/arch/ppc-linux-common.c
index 7cf08eb7daf..b8a7cdb2ad3 100644
--- a/gdb/arch/ppc-linux-common.c
+++ b/gdb/arch/ppc-linux-common.c
@@ -53,7 +53,8 @@ ppc_linux_match_description (struct ppc_linux_features features)
       if (features.cell)
 	tdesc = tdesc_powerpc_cell64l;
       else if (features.vsx)
-	tdesc = (features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx64l
+	tdesc = (features.isa207? tdesc_powerpc_isa207_vsx64l
+		 : features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx64l
 		 : features.isa205? tdesc_powerpc_isa205_vsx64l
 		 : tdesc_powerpc_vsx64l);
       else if (features.altivec)
@@ -70,7 +71,8 @@ ppc_linux_match_description (struct ppc_linux_features features)
       if (features.cell)
 	tdesc = tdesc_powerpc_cell32l;
       else if (features.vsx)
-	tdesc = (features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx32l
+	tdesc = (features.isa207? tdesc_powerpc_isa207_vsx32l
+		 : features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx32l
 		 : features.isa205? tdesc_powerpc_isa205_vsx32l
 		 : tdesc_powerpc_vsx32l);
       else if (features.altivec)
diff --git a/gdb/arch/ppc-linux-common.h b/gdb/arch/ppc-linux-common.h
index 666954e765a..f0e4a4221fb 100644
--- a/gdb/arch/ppc-linux-common.h
+++ b/gdb/arch/ppc-linux-common.h
@@ -32,6 +32,7 @@ struct target_desc;
 #define PPC_LINUX_SIZEOF_VSXREGSET 256
 #define PPC_LINUX_SIZEOF_PPRREGSET 8
 #define PPC_LINUX_SIZEOF_DSCRREGSET 8
+#define PPC_LINUX_SIZEOF_TARREGSET 8
 
 /* Check if the hwcap auxv entry indicates that isa205 is supported.  */
 bool ppc_linux_has_isa205 (CORE_ADDR hwcap);
@@ -44,6 +45,7 @@ struct ppc_linux_features
   bool vsx;
   bool isa205;
   bool ppr_dscr;
+  bool isa207;
   bool cell;
 };
 
@@ -55,6 +57,7 @@ const struct ppc_linux_features ppc_linux_no_features = {
   false,
   false,
   false,
+  false,
 };
 
 /* Return a target description that matches FEATURES.  */
diff --git a/gdb/arch/ppc-linux-tdesc.h b/gdb/arch/ppc-linux-tdesc.h
index 3b5a2286e0b..99628797866 100644
--- a/gdb/arch/ppc-linux-tdesc.h
+++ b/gdb/arch/ppc-linux-tdesc.h
@@ -30,6 +30,7 @@ extern struct target_desc *tdesc_powerpc_isa205_32l;
 extern struct target_desc *tdesc_powerpc_isa205_altivec32l;
 extern struct target_desc *tdesc_powerpc_isa205_vsx32l;
 extern struct target_desc *tdesc_powerpc_isa205_ppr_dscr_vsx32l;
+extern struct target_desc *tdesc_powerpc_isa207_vsx32l;
 extern struct target_desc *tdesc_powerpc_e500l;
 
 extern struct target_desc *tdesc_powerpc_64l;
@@ -40,5 +41,6 @@ extern struct target_desc *tdesc_powerpc_isa205_64l;
 extern struct target_desc *tdesc_powerpc_isa205_altivec64l;
 extern struct target_desc *tdesc_powerpc_isa205_vsx64l;
 extern struct target_desc *tdesc_powerpc_isa205_ppr_dscr_vsx64l;
+extern struct target_desc *tdesc_powerpc_isa207_vsx64l;
 
 #endif /* ARCH_PPC_LINUX_TDESC_H */