x32 Fast tracepoints: IPA target descriptions

Building GDB for x32 fails building the IPA, with:

   .../src/gdb/gdbserver/linux-amd64-ipa.c: In function ‘const target_desc* get_ipa_tdesc(int)’:
   .../src/gdb/gdbserver/linux-amd64-ipa.c:182:14: error: ‘tdesc_amd64_avx_linux’ was not declared in this scope
	  return tdesc_amd64_avx_linux;
		 ^
   .../src/gdb/gdbserver/linux-amd64-ipa.c:184:14: error: ‘tdesc_amd64_mpx_linux’ was not declared in this scope
	  return tdesc_amd64_mpx_linux;
		 ^
   .../src/gdb/gdbserver/linux-amd64-ipa.c:186:14: error: ‘tdesc_amd64_avx_mpx_linux’ was not declared in this scope
	  return tdesc_amd64_avx_mpx_linux;
		 ^
  [...]

The problem is that the IPA is trying to use the 64-bit descriptions,
when it should be using the x32 ones.

gdb/gdbserver/ChangeLog:
2016-08-19  Pedro Alves  <palves@redhat.com>

	PR gdb/20415
	* Makefile.in (x32-linux-ipa.o, x32-avx-linux-ipa.o)
	(x32-avx512-linux-ipa.o): New rules.
	* configure.ac (x86_64-*-linux*): New x32 check.
	* configure.srv (ipa_x32_linux_regobj): New.
	(x86_64-*-linux*): Use $ipa_x32_linux_regobj if building for x32.
	* linux-amd64-ipa.c (get_ipa_tdesc) [__ILP32__]: Return x32
	descriptions.
	(initialize_low_tracepoint) [__ILP32__]: Initialize x32
	descriptions.
	* configure: Regenerate.

gdb/gdbserver/ChangeLog

@@ -1,3 +1,17 @@
+2016-08-19  Pedro Alves  <palves@redhat.com>
+
+	PR gdb/20415
+	* Makefile.in (x32-linux-ipa.o, x32-avx-linux-ipa.o)
+	(x32-avx512-linux-ipa.o): New rules.
+	* configure.ac (x86_64-*-linux*): New x32 check.
+	* configure.srv (ipa_x32_linux_regobj): New.
+	(x86_64-*-linux*): Use $ipa_x32_linux_regobj if building for x32.
+	* linux-amd64-ipa.c (get_ipa_tdesc) [__ILP32__]: Return x32
+	descriptions.
+	(initialize_low_tracepoint) [__ILP32__]: Initialize x32
+	descriptions.
+	* configure: Regenerate.
+
 2016-08-09  Pedro Alves  <palves@redhat.com>
 
 	PR gdb/18653

gdb/gdbserver/Makefile.in

@@ -648,6 +648,15 @@ rsp-low-ipa.o: ../common/rsp-low.c
 errors-ipa.o: ../common/errors.c
 	$(IPAGENT_COMPILE) $<
 	$(POSTCOMPILE)
+x32-linux-ipa.o: x32-linux.c
+	$(IPAGENT_COMPILE) $<
+	$(POSTCOMPILE)
+x32-avx-linux-ipa.o: x32-avx-linux.c
+	$(IPAGENT_COMPILE) $<
+	$(POSTCOMPILE)
+x32-avx512-linux-ipa.o: x32-avx512-linux.c
+	$(IPAGENT_COMPILE) $<
+	$(POSTCOMPILE)
 
 ax.o: ax.c
 	$(COMPILE) $(WARN_CFLAGS_NO_FORMAT) $<

gdb/gdbserver/configure

@@ -6796,6 +6796,37 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gdb_cv_i386_is_x86_64" >&5
 $as_echo "$gdb_cv_i386_is_x86_64" >&6; }
     ;;
+
+  x86_64-*-linux*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking if building for x32" >&5
+$as_echo_n "checking if building for x32... " >&6; }
+if test "${gdb_cv_x86_is_x32+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  save_CPPFLAGS="$CPPFLAGS"
+		    CPPFLAGS="$CPPFLAGS $CFLAGS"
+		    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#if __x86_64__ && __ILP32__
+got it
+#endif
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "got it" >/dev/null 2>&1; then :
+  gdb_cv_x86_is_x32=yes
+else
+  gdb_cv_x86_is_x32=no
+fi
+rm -f conftest*
+
+		    CPPFLAGS="$save_CPPFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gdb_cv_x86_is_x32" >&5
+$as_echo "$gdb_cv_x86_is_x32" >&6; }
+    ;;
+
   m68k-*-*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking if building for Coldfire" >&5
 $as_echo_n "checking if building for Coldfire... " >&6; }

gdb/gdbserver/configure.ac

@@ -218,6 +218,20 @@ got it
                     [gdb_cv_i386_is_x86_64=no])
                     CPPFLAGS="$save_CPPFLAGS"])
     ;;
+
+  x86_64-*-linux*)
+    AC_CACHE_CHECK([if building for x32], [gdb_cv_x86_is_x32],
+		   [save_CPPFLAGS="$CPPFLAGS"
+		    CPPFLAGS="$CPPFLAGS $CFLAGS"
+		    AC_EGREP_CPP([got it], [
+#if __x86_64__ && __ILP32__
+got it
+#endif
+		 ], [gdb_cv_x86_is_x32=yes],
+		    [gdb_cv_x86_is_x32=no])
+		    CPPFLAGS="$save_CPPFLAGS"])
+    ;;
+
   m68k-*-*)
     AC_CACHE_CHECK([if building for Coldfire], [gdb_cv_m68k_is_coldfire],
       	           [save_CPPFLAGS="$CPPFLAGS"

gdb/gdbserver/configure.srv

@@ -31,6 +31,7 @@ srv_amd64_linux_regobj="amd64-linux.o amd64-avx-linux.o amd64-avx512-linux.o amd
 
 ipa_i386_linux_regobj="i386-linux-ipa.o i386-avx-linux-ipa.o  i386-avx-mpx-linux-ipa.o i386-avx512-linux-ipa.o i386-mpx-linux-ipa.o i386-mmx-linux-ipa.o"
 ipa_amd64_linux_regobj="amd64-linux-ipa.o amd64-avx-linux-ipa.o amd64-avx-mpx-linux-ipa.o amd64-avx512-linux-ipa.o amd64-mpx-linux-ipa.o"
+ipa_x32_linux_regobj="x32-linux-ipa.o x32-avx-linux-ipa.o x32-avx512-linux-ipa.o"
 ipa_ppc_linux_regobj="powerpc-32l-ipa.o powerpc-altivec32l-ipa.o powerpc-cell32l-ipa.o powerpc-vsx32l-ipa.o powerpc-isa205-32l-ipa.o powerpc-isa205-altivec32l-ipa.o powerpc-isa205-vsx32l-ipa.o powerpc-e500l-ipa.o powerpc-64l-ipa.o powerpc-altivec64l-ipa.o powerpc-cell64l-ipa.o powerpc-vsx64l-ipa.o powerpc-isa205-64l-ipa.o powerpc-isa205-altivec64l-ipa.o powerpc-isa205-vsx64l-ipa.o"
 
 srv_i386_32bit_xmlfiles="i386/32bit-core.xml i386/32bit-sse.xml i386/32bit-avx.xml i386/32bit-avx512.xml i386/32bit-mpx.xml"
@@ -364,7 +365,12 @@ case "${target}" in
 			srv_linux_regsets=yes
 			srv_linux_thread_db=yes
 			srv_linux_btrace=yes
-			ipa_obj="${ipa_amd64_linux_regobj} linux-amd64-ipa.o"
+			if test "$gdb_cv_x86_is_x32" = yes ; then
+			    ipa_obj="${ipa_x32_linux_regobj}"
+			else
+			    ipa_obj="${ipa_amd64_linux_regobj}"
+			fi
+			ipa_obj="${ipa_obj} linux-amd64-ipa.o"
 			;;
   x86_64-*-mingw*)	srv_regobj="$srv_amd64_regobj"
 			srv_tgtobj="x86-low.o x86-dregs.o i387-fp.o win32-low.o win32-i386-low.o"

gdb/gdbserver/linux-amd64-ipa.c

@@ -174,6 +174,19 @@ supply_static_tracepoint_registers (struct regcache *regcache,
 const struct target_desc *
 get_ipa_tdesc (int idx)
 {
+#if defined __ILP32__
+  switch (idx)
+    {
+    case X86_TDESC_SSE:
+      return tdesc_x32_linux;
+    case X86_TDESC_AVX:
+      return tdesc_x32_avx_linux;
+    case X86_TDESC_AVX512:
+      return tdesc_x32_avx512_linux;
+    default:
+      break;
+    }
+#else
   switch (idx)
     {
     case X86_TDESC_SSE:
@@ -186,11 +199,11 @@ get_ipa_tdesc (int idx)
       return tdesc_amd64_avx_mpx_linux;
     case X86_TDESC_AVX512:
       return tdesc_amd64_avx512_linux;
-    default:
-      internal_error (__FILE__, __LINE__,
-		      "unknown ipa tdesc index: %d", idx);
-      return tdesc_amd64_linux;
     }
+#endif
+
+  internal_error (__FILE__, __LINE__,
+		  "unknown ipa tdesc index: %d", idx);
 }
 
 /* Allocate buffer for the jump pads.  Since we're using 32-bit jumps
@@ -213,9 +226,15 @@ alloc_jump_pad_buffer (size_t size)
 void
 initialize_low_tracepoint (void)
 {
+#if defined __ILP32__
+  init_registers_x32_linux ();
+  init_registers_x32_avx_linux ();
+  init_registers_x32_avx512_linux ();
+#else
   init_registers_amd64_linux ();
   init_registers_amd64_avx_linux ();
   init_registers_amd64_avx_mpx_linux ();
   init_registers_amd64_mpx_linux ();
   init_registers_amd64_avx512_linux ();
+#endif
 }