From FEDORA_PATCHES Mon Sep 17 00:00:00 2001

From: Keith Seitz <keiths@redhat.com>

Date: Fri, 11 Jan 2019 17:02:17 -0500

Subject: gdb-rhbz1187581-power8-regs-not-in-8.2-12of15.patch

;; [PowerPC] Add support for EBB and PMU registers

;; Edjunior Barbosa Machado and Pedro Franco de Carvalho, RH BZ 1187581m

[PowerPC] Add support for EBB and PMU registers

This patch adds support for registers of the Event Based Branching and

Performance Monitoring Units for the powerpc linux native and core

file targets, and for the powerpc linux server stub.

All three EBB registers are accessible.  Only a subset of the PMU

registers can be accessed through ptrace.  Because of this, the PMU

registers are enumerated individually in gdbarch_tdep, as opposed to

having a single "have_pmu" flag.  This is intended to make it easier

to add additional PMU registers in the future, since checking a

"have_pmu" flag elsewhere in the code would no longer be correct.  The

tdesc feature is named org.gnu.gdb.power.linux.pmu because of this.

It's unclear if it makes sense to save and restore these registers

across function calls, since some of them can be modified

asynchronously.  They are also not tracked in record-replay mode.

The kernel can return ENODATA when ptrace is used to get the EBB

registers, unless a linux performance event that uses EBB is open in

the inferior.  For this reason, the "fill" functions in the server

stub for the ebb register sets is not implemented.

Since gdbserver writes all registers in one go before resuming the

inferior, this error would not be detected at the time the user tries

to write to one of the registers on the client side, and gdbserver

would print out warnings every time it resumes the inferior when no

ebb performance event is opened, so there is currently no

straightforward way to handle this case.  This means the ebb registers

in the client-side regcache can become dirty when the user tries to

write to them, until the inferior is resumed and stopped again.

A related issue is that 'G' packets used to write to unrelated

registers will include bad data for the EBB registers if they are

unavailable, since no register status information is included in the

'G' packet.  This data won't be written to the inferior by the

gdbserver stub because the "fill" functions are not implemented, and

currently the gdbserver stub doesn't change the status of the

registers in its own regcache in response to 'G' packets.

Another limitation for the ebb registers is that traceframes don't

record if registers are available or not, so if these registers are

collected when a tracepoint is hit and the inferior has no ebb event

opened, the user will see zero values for all of them, instead of the

usual <unavailable>.

Because these registers are often unavailable, trying to store them

with target_store_registers with -1 for the regno argument (all

registers) would almost always fail, so they are ignored in this case.

gdb/ChangeLog:

2018-10-26  Edjunior Barbosa Machado  <emachado@linux.vnet.ibm.com>

        Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

    * arch/ppc-linux-common.h (PPC_LINUX_SIZEOF_EBBREGSET)

    (PPC_LINUX_SIZEOF_PMUREGSET): Declare.

    * nat/ppc-linux.h (PPC_FEATURE2_EBB, NT_PPC_EBB, NT_PPC_PMU):

    Define if not already defined.

    * features/rs6000/power-ebb.xml: New file.

    * features/rs6000/power-linux-pmu.xml: New file.

    * features/rs6000/powerpc-isa207-vsx32l.xml: Include ebb and pmu

    features.

    * features/rs6000/powerpc-isa207-vsx64l.xml: Likewise.

    * features/rs6000/powerpc-isa207-vsx32l.c: Re-generate.

    * features/rs6000/powerpc-isa207-vsx64l.c: Re-generate.

    * regformats/rs6000/powerpc-isa207-vsx32l.dat: Re-generate.

    * regformats/rs6000/powerpc-isa207-vsx64l.dat: Re-generate.

    * ppc-linux-nat.c (fetch_register, fetch_ppc_registers): Call

    fetch_regset with ebb and pmu regsets.

    (store_register, store_ppc_registers): Call store_regset with ebb

    and pmu regsets.

    (ppc_linux_nat_target::read_description): Set isa207 field in the

    features struct if ebb and pmu are avaiable.

    * ppc-linux-tdep.c (ppc32_regmap_ebb, ppc32_regmap_pmu)

    (ppc32_linux_ebbregset, ppc32_linux_pmuregset): New globals.

    (ppc_linux_iterate_over_regset_sections): Call back with the ebb

    and pmu regsets.

    (ppc_linux_core_read_description): Check if the pmu section is

    present and set isa207 in the features struct.

    * ppc-linux-tdep.h (ppc32_linux_ebbregset)

    (ppc32_linux_pmuregset): Declare.

    * ppc-tdep.h (struct gdbarch_tdep) <ppc_mmcr0_regnum>: New field.

    <ppc_mmcr2_regnum, ppc_siar_regnum, ppc_sdar_regnum>: New fields.

    <ppc_sier_regnum>: New field.

    (enum): <PPC_BESCR_REGNUM, PPC_EBBHR_REGNUM, PPC_EBBRR_REGNUM>:

    New enum values.

    <PPC_MMCR0_REGNUM, PPC_MMCR2_REGNUM, PPC_SIAR_REGNUM>: New enum

    values.

    <PPC_SDAR_REGNUM, PPC_SIER_REGNUM>: New enum values.

    (PPC_IS_EBB_REGNUM, PPC_IS_PMU_REGNUM): Define.

    * rs6000-tdep.c (rs6000_gdbarch_init): Look for and validate the

    ebb and pmu features.

gdb/gdbserver/ChangeLog:

2018-10-26  Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

    * configure.srv (powerpc*-*-linux*): Add rs6000/power-ebb.xml and

    rs6000/power-linux-pmu.xml to srv_xmlfiles.

    * linux-ppc-low.c (ppc_store_ebbregset, ppc_fill_pmuregset)

    (ppc_store_pmuregset): New functions.

    (ppc_regsets): Add entries for ebb and pmu regsets.

    (ppc_arch_setup): Set isa207 in features struct if the ebb and

    pmu regsets are available.  Set sizes for these regsets.

gdb/doc/ChangeLog:

2018-10-26  Pedro Franco de Carvalho  <pedromfc@linux.ibm.com>

    * gdb.texinfo (PowerPC Features): Describe new features

    "org.gnu.gdb.power.ebb" and "org.gnu.gdb.power.linux.pmu".

diff --git a/gdb/arch/ppc-linux-common.h b/gdb/arch/ppc-linux-common.h

--- a/gdb/arch/ppc-linux-common.h

+++ b/gdb/arch/ppc-linux-common.h

@@ -33,6 +33,8 @@ struct target_desc;

 #define PPC_LINUX_SIZEOF_PPRREGSET 8

 #define PPC_LINUX_SIZEOF_DSCRREGSET 8

 #define PPC_LINUX_SIZEOF_TARREGSET 8

+#define PPC_LINUX_SIZEOF_EBBREGSET (3*8)

+#define PPC_LINUX_SIZEOF_PMUREGSET (5*8)

 /* Check if the hwcap auxv entry indicates that isa205 is supported.  */

 bool ppc_linux_has_isa205 (CORE_ADDR hwcap);

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo

--- a/gdb/doc/gdb.texinfo

+++ b/gdb/doc/gdb.texinfo

@@ -42564,6 +42564,15 @@ contain the 64-bit register @samp{dscr}.

 The @samp{org.gnu.gdb.power.tar} feature is optional.  It should

 contain the 64-bit register @samp{tar}.

+The @samp{org.gnu.gdb.power.ebb} feature is optional.  It should

+contain registers @samp{bescr}, @samp{ebbhr} and @samp{ebbrr}, all

+64-bit wide.

+

+The @samp{org.gnu.gdb.power.linux.pmu} feature is optional.  It should

+contain registers @samp{mmcr0}, @samp{mmcr2}, @samp{siar}, @samp{sdar}

+and @samp{sier}, all 64-bit wide.  This is the subset of the isa 2.07

+server PMU registers provided by @sc{gnu}/Linux.

+

 @node S/390 and System z Features

 @subsection S/390 and System z Features

 @cindex target descriptions, S/390 features

diff --git a/gdb/features/rs6000/power-ebb.xml b/gdb/features/rs6000/power-ebb.xml

new file mode 100644

--- /dev/null

+++ b/gdb/features/rs6000/power-ebb.xml

@@ -0,0 +1,14 @@

+

+

+

+     Copying and distribution of this file, with or without modification,

+     are permitted in any medium without royalty provided the copyright

+     notice and this notice are preserved.  -->

+

+

+

+<feature name="org.gnu.gdb.power.ebb">

+  <reg name="bescr" bitsize="64" type="uint64" save-restore="no"/>

+  <reg name="ebbhr" bitsize="64" type="uint64" save-restore="no"/>

+  <reg name="ebbrr" bitsize="64" type="uint64" save-restore="no"/>

+</feature>

diff --git a/gdb/features/rs6000/power-linux-pmu.xml b/gdb/features/rs6000/power-linux-pmu.xml

new file mode 100644

--- /dev/null

+++ b/gdb/features/rs6000/power-linux-pmu.xml

@@ -0,0 +1,17 @@

+

+

+

+     Copying and distribution of this file, with or without modification,

+     are permitted in any medium without royalty provided the copyright

+     notice and this notice are preserved.  -->

+

+

+     provided by Linux.  -->

+

+<feature name="org.gnu.gdb.power.linux.pmu">

+  <reg name="mmcr0" bitsize="64" type="uint64" save-restore="no"/>

+  <reg name="mmcr2" bitsize="64" type="uint64" save-restore="no"/>

+  <reg name="siar" bitsize="64" type="uint64" save-restore="no"/>

+  <reg name="sdar" bitsize="64" type="uint64" save-restore="no"/>

+  <reg name="sier" bitsize="64" type="uint64" save-restore="no"/>

+</feature>

diff --git a/gdb/features/rs6000/powerpc-isa207-vsx32l.c b/gdb/features/rs6000/powerpc-isa207-vsx32l.c

--- a/gdb/features/rs6000/powerpc-isa207-vsx32l.c

+++ b/gdb/features/rs6000/powerpc-isa207-vsx32l.c

@@ -199,5 +199,17 @@ initialize_tdesc_powerpc_isa207_vsx32l (void)

   feature = tdesc_create_feature (result, "org.gnu.gdb.power.tar");

   tdesc_create_reg (feature, "tar", 141, 1, NULL, 64, "uint64");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.power.ebb");

+  tdesc_create_reg (feature, "bescr", 142, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "ebbhr", 143, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "ebbrr", 144, 0, NULL, 64, "uint64");

+

+  feature = tdesc_create_feature (result, "org.gnu.gdb.power.linux.pmu");

+  tdesc_create_reg (feature, "mmcr0", 145, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "mmcr2", 146, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "siar", 147, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "sdar", 148, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "sier", 149, 0, NULL, 64, "uint64");

+

   tdesc_powerpc_isa207_vsx32l = result;

 }

diff --git a/gdb/features/rs6000/powerpc-isa207-vsx32l.xml b/gdb/features/rs6000/powerpc-isa207-vsx32l.xml

--- a/gdb/features/rs6000/powerpc-isa207-vsx32l.xml

+++ b/gdb/features/rs6000/powerpc-isa207-vsx32l.xml

@@ -16,4 +16,6 @@

   <xi:include href="power-ppr.xml"/>

   <xi:include href="power-dscr.xml"/>

   <xi:include href="power-tar.xml"/>

+  <xi:include href="power-ebb.xml"/>

+  <xi:include href="power-linux-pmu.xml"/>

 </target>

diff --git a/gdb/features/rs6000/powerpc-isa207-vsx64l.c b/gdb/features/rs6000/powerpc-isa207-vsx64l.c

--- a/gdb/features/rs6000/powerpc-isa207-vsx64l.c

+++ b/gdb/features/rs6000/powerpc-isa207-vsx64l.c

@@ -199,5 +199,17 @@ initialize_tdesc_powerpc_isa207_vsx64l (void)

   feature = tdesc_create_feature (result, "org.gnu.gdb.power.tar");

   tdesc_create_reg (feature, "tar", 141, 1, NULL, 64, "uint64");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.power.ebb");

+  tdesc_create_reg (feature, "bescr", 142, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "ebbhr", 143, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "ebbrr", 144, 0, NULL, 64, "uint64");

+

+  feature = tdesc_create_feature (result, "org.gnu.gdb.power.linux.pmu");

+  tdesc_create_reg (feature, "mmcr0", 145, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "mmcr2", 146, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "siar", 147, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "sdar", 148, 0, NULL, 64, "uint64");

+  tdesc_create_reg (feature, "sier", 149, 0, NULL, 64, "uint64");

+

   tdesc_powerpc_isa207_vsx64l = result;

 }

diff --git a/gdb/features/rs6000/powerpc-isa207-vsx64l.xml b/gdb/features/rs6000/powerpc-isa207-vsx64l.xml

--- a/gdb/features/rs6000/powerpc-isa207-vsx64l.xml

+++ b/gdb/features/rs6000/powerpc-isa207-vsx64l.xml

@@ -16,4 +16,6 @@

   <xi:include href="power-ppr.xml"/>

   <xi:include href="power-dscr.xml"/>

   <xi:include href="power-tar.xml"/>

+  <xi:include href="power-ebb.xml"/>

+  <xi:include href="power-linux-pmu.xml"/>

 </target>

diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv

--- a/gdb/gdbserver/configure.srv

+++ b/gdb/gdbserver/configure.srv

@@ -249,6 +249,8 @@ case "${target}" in

 			srv_xmlfiles="${srv_xmlfiles} rs6000/power-dscr.xml"

 			srv_xmlfiles="${srv_xmlfiles} rs6000/power-ppr.xml"

 			srv_xmlfiles="${srv_xmlfiles} rs6000/power-tar.xml"

+			srv_xmlfiles="${srv_xmlfiles} rs6000/power-ebb.xml"

+			srv_xmlfiles="${srv_xmlfiles} rs6000/power-linux-pmu.xml"

 			srv_xmlfiles="${srv_xmlfiles} rs6000/powerpc-e500l.xml"

 			srv_xmlfiles="${srv_xmlfiles} rs6000/power-spe.xml"

 			srv_xmlfiles="${srv_xmlfiles} rs6000/powerpc-64l.xml"

diff --git a/gdb/gdbserver/linux-ppc-low.c b/gdb/gdbserver/linux-ppc-low.c

--- a/gdb/gdbserver/linux-ppc-low.c

+++ b/gdb/gdbserver/linux-ppc-low.c

@@ -545,6 +545,61 @@ ppc_store_tarregset (struct regcache *regcache, const void *buf)

   supply_register_by_name (regcache, "tar", tar);

 }

+/* Event-Based Branching regset store function.  Unless the inferior

+   has a perf event open, ptrace can return in error when reading and

+   writing to the regset, with ENODATA.  For reading, the registers

+   will correctly show as unavailable.  For writing, gdbserver

+   currently only caches any register writes from P and G packets and

+   the stub always tries to write all the regsets when resuming the

+   inferior, which would result in frequent warnings.  For this

+   reason, we don't define a fill function.  This also means that the

+   client-side regcache will be dirty if the user tries to write to

+   the EBB registers.  G packets that the client sends to write to

+   unrelated registers will also include data for EBB registers, even

+   if they are unavailable.  */

+

+static void

+ppc_store_ebbregset (struct regcache *regcache, const void *buf)

+{

+  const char *regset = (const char *) buf;

+

+  /* The order in the kernel regset is: EBBRR, EBBHR, BESCR.  In the

+     .dat file is BESCR, EBBHR, EBBRR.  */

+  supply_register_by_name (regcache, "ebbrr", &regset[0]);

+  supply_register_by_name (regcache, "ebbhr", &regset[8]);

+  supply_register_by_name (regcache, "bescr", &regset[16]);

+}

+

+/* Performance Monitoring Unit regset fill function.  */

+

+static void

+ppc_fill_pmuregset (struct regcache *regcache, void *buf)

+{

+  char *regset = (char *) buf;

+

+  /* The order in the kernel regset is SIAR, SDAR, SIER, MMCR2, MMCR0.

+     In the .dat file is MMCR0, MMCR2, SIAR, SDAR, SIER.  */

+  collect_register_by_name (regcache, "siar", &regset[0]);

+  collect_register_by_name (regcache, "sdar", &regset[8]);

+  collect_register_by_name (regcache, "sier", &regset[16]);

+  collect_register_by_name (regcache, "mmcr2", &regset[24]);

+  collect_register_by_name (regcache, "mmcr0", &regset[32]);

+}

+

+/* Performance Monitoring Unit regset store function.  */

+

+static void

+ppc_store_pmuregset (struct regcache *regcache, const void *buf)

+{

+  const char *regset = (const char *) buf;

+

+  supply_register_by_name (regcache, "siar", &regset[0]);

+  supply_register_by_name (regcache, "sdar", &regset[8]);

+  supply_register_by_name (regcache, "sier", &regset[16]);

+  supply_register_by_name (regcache, "mmcr2", &regset[24]);

+  supply_register_by_name (regcache, "mmcr0", &regset[32]);

+}

+

 static void

 ppc_fill_vsxregset (struct regcache *regcache, void *buf)

 {

@@ -654,6 +709,10 @@ static struct regset_info ppc_regsets[] = {

      fetch them every time, but still fall back to PTRACE_PEEKUSER for the

      general registers.  Some kernels support these, but not the newer

      PPC_PTRACE_GETREGS.  */

+  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PPC_EBB, 0, EXTENDED_REGS,

+    NULL, ppc_store_ebbregset },

+  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PPC_PMU, 0, EXTENDED_REGS,

+    ppc_fill_pmuregset, ppc_store_pmuregset },

   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PPC_TAR, 0, EXTENDED_REGS,

     ppc_fill_tarregset, ppc_store_tarregset },

   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PPC_PPR, 0, EXTENDED_REGS,

@@ -734,8 +793,13 @@ ppc_arch_setup (void)

       features.ppr_dscr = true;

       if ((ppc_hwcap2 & PPC_FEATURE2_ARCH_2_07)

 	  && (ppc_hwcap2 & PPC_FEATURE2_TAR)

+	  && (ppc_hwcap2 & PPC_FEATURE2_EBB)

 	  && ppc_check_regset (tid, NT_PPC_TAR,

-			       PPC_LINUX_SIZEOF_TARREGSET))

+			       PPC_LINUX_SIZEOF_TARREGSET)

+	  && ppc_check_regset (tid, NT_PPC_EBB,

+			       PPC_LINUX_SIZEOF_EBBREGSET)

+	  && ppc_check_regset (tid, NT_PPC_PMU,

+			       PPC_LINUX_SIZEOF_PMUREGSET))

 	features.isa207 = true;

     }

@@ -798,6 +862,14 @@ ppc_arch_setup (void)

 	    regset->size = (features.isa207 ?

 			    PPC_LINUX_SIZEOF_TARREGSET : 0);

 	    break;

+	  case NT_PPC_EBB:

+	    regset->size = (features.isa207 ?

+			    PPC_LINUX_SIZEOF_EBBREGSET : 0);

+	    break;

+	  case NT_PPC_PMU:

+	    regset->size = (features.isa207 ?

+			    PPC_LINUX_SIZEOF_PMUREGSET : 0);

+	    break;

 	  default:

 	    break;

 	  }

diff --git a/gdb/nat/ppc-linux.h b/gdb/nat/ppc-linux.h

--- a/gdb/nat/ppc-linux.h

+++ b/gdb/nat/ppc-linux.h

@@ -60,6 +60,9 @@

 #ifndef PPC_FEATURE2_TAR

 #define PPC_FEATURE2_TAR 0x04000000

 #endif

+#ifndef PPC_FEATURE2_EBB

+#define PPC_FEATURE2_EBB 0x10000000

+#endif

 /* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a

    configure time check.  Some older glibc's (for instance 2.2.1)

@@ -106,6 +109,16 @@

 #define NT_PPC_DSCR 0x105

 #endif

+/* Event Based Branch Registers.  */

+#ifndef NT_PPC_EBB

+#define NT_PPC_EBB 0x106

+#endif

+

+/* Performance Monitor Registers.  */

+#ifndef NT_PPC_PMU

+#define NT_PPC_PMU 0x107

+#endif

+

 /* Return the wordsize of the target, either 4 or 8 bytes.  */

 int ppc_linux_target_wordsize (int tid);

diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c

--- a/gdb/ppc-linux-nat.c

+++ b/gdb/ppc-linux-nat.c

@@ -667,6 +667,24 @@ fetch_register (struct regcache *regcache, int tid, int regno)

 		    &ppc32_linux_tarregset);

       return;

     }

+  else if (PPC_IS_EBB_REGNUM (regno))

+    {

+      gdb_assert (tdep->have_ebb);

+

+      fetch_regset (regcache, tid, NT_PPC_EBB,

+		    PPC_LINUX_SIZEOF_EBBREGSET,

+		    &ppc32_linux_ebbregset);

+      return;

+    }

+  else if (PPC_IS_PMU_REGNUM (regno))

+    {

+      gdb_assert (tdep->ppc_mmcr0_regnum != -1);

+

+      fetch_regset (regcache, tid, NT_PPC_PMU,

+		    PPC_LINUX_SIZEOF_PMUREGSET,

+		    &ppc32_linux_pmuregset);

+      return;

+    }

   if (regaddr == -1)

     {

@@ -875,6 +893,14 @@ fetch_ppc_registers (struct regcache *regcache, int tid)

     fetch_regset (regcache, tid, NT_PPC_TAR,

 		  PPC_LINUX_SIZEOF_TARREGSET,

 		  &ppc32_linux_tarregset);

+  if (tdep->have_ebb)

+    fetch_regset (regcache, tid, NT_PPC_EBB,

+		  PPC_LINUX_SIZEOF_EBBREGSET,

+		  &ppc32_linux_ebbregset);

+  if (tdep->ppc_mmcr0_regnum != -1)

+    fetch_regset (regcache, tid, NT_PPC_PMU,

+		  PPC_LINUX_SIZEOF_PMUREGSET,

+		  &ppc32_linux_pmuregset);

 }

 /* Fetch registers from the child process.  Fetch all registers if

@@ -1082,6 +1108,24 @@ store_register (const struct regcache *regcache, int tid, int regno)

 		    &ppc32_linux_tarregset);

       return;

     }

+  else if (PPC_IS_EBB_REGNUM (regno))

+    {

+      gdb_assert (tdep->have_ebb);

+

+      store_regset (regcache, tid, regno, NT_PPC_EBB,

+		    PPC_LINUX_SIZEOF_EBBREGSET,

+		    &ppc32_linux_ebbregset);

+      return;

+    }

+  else if (PPC_IS_PMU_REGNUM (regno))

+    {

+      gdb_assert (tdep->ppc_mmcr0_regnum != -1);

+

+      store_regset (regcache, tid, regno, NT_PPC_PMU,

+		    PPC_LINUX_SIZEOF_PMUREGSET,

+		    &ppc32_linux_pmuregset);

+      return;

+    }

   if (regaddr == -1)

     return;

@@ -1308,6 +1352,15 @@ store_ppc_registers (const struct regcache *regcache, int tid)

     store_regset (regcache, tid, -1, NT_PPC_TAR,

 		  PPC_LINUX_SIZEOF_TARREGSET,

 		  &ppc32_linux_tarregset);

+

+  if (tdep->ppc_mmcr0_regnum != -1)

+    store_regset (regcache, tid, -1, NT_PPC_PMU,

+		  PPC_LINUX_SIZEOF_PMUREGSET,

+		  &ppc32_linux_pmuregset);

+

+  /* Because the EBB registers can be unavailable, attempts to store

+     them here would cause this function to fail most of the time, so

+     we ignore them.  */

 }

 /* Fetch the AT_HWCAP entry from the aux vector.  */

@@ -2439,7 +2492,10 @@ ppc_linux_nat_target::read_description ()

       features.ppr_dscr = true;

       if ((hwcap2 & PPC_FEATURE2_ARCH_2_07)

 	  && (hwcap2 & PPC_FEATURE2_TAR)

-	  && check_regset (tid, NT_PPC_TAR, PPC_LINUX_SIZEOF_TARREGSET))

+	  && (hwcap2 & PPC_FEATURE2_EBB)

+	  && check_regset (tid, NT_PPC_TAR, PPC_LINUX_SIZEOF_TARREGSET)

+	  && check_regset (tid, NT_PPC_EBB, PPC_LINUX_SIZEOF_EBBREGSET)

+	  && check_regset (tid, NT_PPC_PMU, PPC_LINUX_SIZEOF_PMUREGSET))

 	features.isa207 = true;

     }

diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c

--- a/gdb/ppc-linux-tdep.c

+++ b/gdb/ppc-linux-tdep.c

@@ -599,6 +599,44 @@ const struct regset ppc32_linux_tarregset = {

   regcache_collect_regset

 };

+/* Event-Based Branching regmap.  */

+

+static const struct regcache_map_entry ppc32_regmap_ebb[] =

+  {

+      { 1, PPC_EBBRR_REGNUM, 8 },

+      { 1, PPC_EBBHR_REGNUM, 8 },

+      { 1, PPC_BESCR_REGNUM, 8 },

+      { 0 }

+  };

+

+/* Event-Based Branching regset.  */

+

+const struct regset ppc32_linux_ebbregset = {

+  ppc32_regmap_ebb,

+  regcache_supply_regset,

+  regcache_collect_regset

+};

+

+/* Performance Monitoring Unit regmap.  */

+

+static const struct regcache_map_entry ppc32_regmap_pmu[] =

+  {

+      { 1, PPC_SIAR_REGNUM, 8 },

+      { 1, PPC_SDAR_REGNUM, 8 },

+      { 1, PPC_SIER_REGNUM, 8 },

+      { 1, PPC_MMCR2_REGNUM, 8 },

+      { 1, PPC_MMCR0_REGNUM, 8 },

+      { 0 }

+  };

+

+/* Performance Monitoring Unit regset.  */

+

+const struct regset ppc32_linux_pmuregset = {

+  ppc32_regmap_pmu,

+  regcache_supply_regset,

+  regcache_collect_regset

+};

+

 const struct regset *

 ppc_linux_gregset (int wordsize)

 {

@@ -674,6 +712,22 @@ ppc_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,

     cb (".reg-ppc-tar", PPC_LINUX_SIZEOF_TARREGSET,

 	PPC_LINUX_SIZEOF_TARREGSET,

 	&ppc32_linux_tarregset, "Target Address Register", cb_data);

+

+  /* EBB registers are unavailable when ptrace returns ENODATA.  Check

+     availability when generating a core file (regcache != NULL).  */

+  if (tdep->have_ebb)

+    if (regcache == NULL

+	|| REG_VALID == regcache->get_register_status (PPC_BESCR_REGNUM))

+      cb (".reg-ppc-ebb", PPC_LINUX_SIZEOF_EBBREGSET,

+	  PPC_LINUX_SIZEOF_EBBREGSET,

+	  &ppc32_linux_ebbregset, "Event-based Branching Registers",

+	  cb_data);

+

+  if (tdep->ppc_mmcr0_regnum != -1)

+    cb (".reg-ppc-pmu", PPC_LINUX_SIZEOF_PMUREGSET,

+	PPC_LINUX_SIZEOF_PMUREGSET,

+	&ppc32_linux_pmuregset, "Performance Monitor Registers",

+	cb_data);

 }

 static void

@@ -1089,6 +1143,7 @@ ppc_linux_core_read_description (struct gdbarch *gdbarch,

   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");

+  asection *pmu = bfd_get_section_by_name (abfd, ".reg-ppc-pmu");

   if (! section)

     return NULL;

@@ -1124,7 +1179,12 @@ ppc_linux_core_read_description (struct gdbarch *gdbarch,

   if (ppr && dscr)

     {

       features.ppr_dscr = true;

-      if (tar)

+

+      /* We don't require the EBB note section to be present in the

+	 core file to select isa207 because these registers could have

+	 been unavailable when the core file was created.  They will

+	 be in the tdep but will show as unavailable.  */

+      if (tar && pmu)

 	features.isa207 = true;

     }

diff --git a/gdb/ppc-linux-tdep.h b/gdb/ppc-linux-tdep.h

--- a/gdb/ppc-linux-tdep.h

+++ b/gdb/ppc-linux-tdep.h

@@ -48,5 +48,7 @@ int ppc_linux_trap_reg_p (struct gdbarch *gdbarch);

 extern const struct regset ppc32_linux_pprregset;

 extern const struct regset ppc32_linux_dscrregset;

 extern const struct regset ppc32_linux_tarregset;

+extern const struct regset ppc32_linux_ebbregset;

+extern const struct regset ppc32_linux_pmuregset;

 #endif /* PPC_LINUX_TDEP_H */

diff --git a/gdb/ppc-tdep.h b/gdb/ppc-tdep.h

--- a/gdb/ppc-tdep.h

+++ b/gdb/ppc-tdep.h

@@ -265,6 +265,15 @@ struct gdbarch_tdep

     /* Decimal 128 registers.  */

     int ppc_dl0_regnum;		/* First Decimal128 argument register pair.  */

+    int have_ebb;

+

+    /* PMU registers.  */

+    int ppc_mmcr0_regnum;

+    int ppc_mmcr2_regnum;

+    int ppc_siar_regnum;

+    int ppc_sdar_regnum;

+    int ppc_sier_regnum;

+

     /* Offset to ABI specific location where link register is saved.  */

     int lr_frame_offset;	

@@ -321,12 +330,31 @@ enum {

   PPC_PPR_REGNUM = 172,

   PPC_DSCR_REGNUM = 173,

   PPC_TAR_REGNUM = 174,

+

+  /* EBB registers.  */

+  PPC_BESCR_REGNUM = 175,

+  PPC_EBBHR_REGNUM = 176,

+  PPC_EBBRR_REGNUM = 177,

+

+  /* PMU registers.  */

+  PPC_MMCR0_REGNUM = 178,

+  PPC_MMCR2_REGNUM = 179,

+  PPC_SIAR_REGNUM = 180,

+  PPC_SDAR_REGNUM = 181,

+  PPC_SIER_REGNUM = 182,

+

   PPC_NUM_REGS

 };

 /* Big enough to hold the size of the largest register in bytes.  */

 #define PPC_MAX_REGISTER_SIZE	64

+#define PPC_IS_EBB_REGNUM(i) \

+	((i) >= PPC_BESCR_REGNUM && (i) <= PPC_EBBRR_REGNUM)

+

+#define PPC_IS_PMU_REGNUM(i) \

+	((i) >= PPC_MMCR0_REGNUM && (i) <= PPC_SIER_REGNUM)

+

 /* An instruction to match.  */

 struct ppc_insn_pattern

diff --git a/gdb/regformats/rs6000/powerpc-isa207-vsx32l.dat b/gdb/regformats/rs6000/powerpc-isa207-vsx32l.dat

--- a/gdb/regformats/rs6000/powerpc-isa207-vsx32l.dat

+++ b/gdb/regformats/rs6000/powerpc-isa207-vsx32l.dat

@@ -145,3 +145,11 @@ expedite:r1,pc

 64:ppr

 64:dscr

 64:tar

+64:bescr

+64:ebbhr

+64:ebbrr

+64:mmcr0

+64:mmcr2

+64:siar

+64:sdar

+64:sier

diff --git a/gdb/regformats/rs6000/powerpc-isa207-vsx64l.dat b/gdb/regformats/rs6000/powerpc-isa207-vsx64l.dat

--- a/gdb/regformats/rs6000/powerpc-isa207-vsx64l.dat

+++ b/gdb/regformats/rs6000/powerpc-isa207-vsx64l.dat

@@ -145,3 +145,11 @@ expedite:r1,pc

 64:ppr

 64:dscr

 64:tar

+64:bescr

+64:ebbhr

+64:ebbrr

+64:mmcr0

+64:mmcr2

+64:siar

+64:sdar

+64:sier

diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c

--- a/gdb/rs6000-tdep.c

+++ b/gdb/rs6000-tdep.c

@@ -5871,7 +5871,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)

   enum powerpc_elf_abi elf_abi = POWERPC_ELF_AUTO;

   int have_fpu = 0, have_spe = 0, have_mq = 0, have_altivec = 0;

   int have_dfp = 0, have_vsx = 0, have_ppr = 0, have_dscr = 0;

-  int have_tar = 0;

+  int have_tar = 0, have_ebb = 0, have_pmu = 0;

   int tdesc_wordsize = -1;

   const struct target_desc *tdesc = info.target_desc;

   struct tdesc_arch_data *tdesc_data = NULL;

@@ -6211,6 +6211,64 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)

 	}

       else

 	have_tar = 0;

+

+      /* Event-based Branching Registers.  */

+      feature = tdesc_find_feature (tdesc,

+				    "org.gnu.gdb.power.ebb");

+      if (feature != NULL)

+	{

+	  static const char *const ebb_regs[] = {

+	    "bescr", "ebbhr", "ebbrr"

+	  };

+

+	  valid_p = 1;

+	  for (i = 0; i < ARRAY_SIZE (ebb_regs); i++)

+	    valid_p &= tdesc_numbered_register (feature, tdesc_data,

+						PPC_BESCR_REGNUM + i,

+						ebb_regs[i]);

+	  if (!valid_p)

+	    {

+	      tdesc_data_cleanup (tdesc_data);

+	      return NULL;

+	    }

+	  have_ebb = 1;

+	}