Initial x32 support.

2011-07-07  H.J. Lu  <hongjiu.lu@intel.com>

	* config.gcc: Support --with-multilib-list for x86 Linux
	targets.

	* configure.ac: Mention x86-64 for --with-multilib-list.
	* configure: Regenerated.

	* config/i386/gnu-user64.h (SPEC_64): Support x32.
	(SPEC_32): Likewise.
	(ASM_SPEC): Likewise.
	(LINK_SPEC): Likewise.
	(TARGET_THREAD_SSP_OFFSET): Likewise.
	(TARGET_THREAD_SPLIT_STACK_OFFSET): Likewise.
	(SPEC_X32): New.

	* config/i386/i386.h (TARGET_X32): New.
	(TARGET_LP64): New.
	(LONG_TYPE_SIZE): Likewise.
	(POINTER_SIZE): Likewise.
	(POINTERS_EXTEND_UNSIGNED): Likewise.
	(OPT_ARCH64): Support x32.
	(OPT_ARCH32): Likewise.

	* config/i386/i386.opt (mx32): New.

	* config/i386/kfreebsd-gnu64.h (GNU_USER_LINK_EMULATIONX32): New.
	(GLIBC_DYNAMIC_LINKERX32): Likewise.
	* config/i386/linux64.h (GNU_USER_LINK_EMULATIONX32): Likewise.
	(GLIBC_DYNAMIC_LINKERX32): Likewise.

	* config/linux.h (UCLIBC_DYNAMIC_LINKERX32): New.
	(BIONIC_DYNAMIC_LINKERX32): Likewise.
	(GNU_USER_DYNAMIC_LINKERX32): Likewise.

	* config/i386/t-linux64: Support TM_MULTILIB_CONFIG.

	* doc/install.texi: Document --with-multilib-list for
	Linux/x86-64.

	* doc/invoke.texi: Document -mx32.

From-SVN: r175984

13 files changed, 156 insertions, 22 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1c481de..35d8859 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,45 @@
+2011-07-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* config.gcc: Support --with-multilib-list for x86 Linux
+	targets.
+
+	* configure.ac: Mention x86-64 for --with-multilib-list.
+	* configure: Regenerated.
+
+	* config/i386/gnu-user64.h (SPEC_64): Support x32.
+	(SPEC_32): Likewise.
+	(ASM_SPEC): Likewise.
+	(LINK_SPEC): Likewise.
+	(TARGET_THREAD_SSP_OFFSET): Likewise.
+	(TARGET_THREAD_SPLIT_STACK_OFFSET): Likewise.
+	(SPEC_X32): New.
+
+	* config/i386/i386.h (TARGET_X32): New.
+	(TARGET_LP64): New.
+	(LONG_TYPE_SIZE): Likewise.
+	(POINTER_SIZE): Likewise.
+	(POINTERS_EXTEND_UNSIGNED): Likewise.
+	(OPT_ARCH64): Support x32.
+	(OPT_ARCH32): Likewise.
+
+	* config/i386/i386.opt (mx32): New.
+
+	* config/i386/kfreebsd-gnu64.h (GNU_USER_LINK_EMULATIONX32): New.
+	(GLIBC_DYNAMIC_LINKERX32): Likewise.
+	* config/i386/linux64.h (GNU_USER_LINK_EMULATIONX32): Likewise.
+	(GLIBC_DYNAMIC_LINKERX32): Likewise.
+
+	* config/linux.h (UCLIBC_DYNAMIC_LINKERX32): New.
+	(BIONIC_DYNAMIC_LINKERX32): Likewise.
+	(GNU_USER_DYNAMIC_LINKERX32): Likewise.
+
+	* config/i386/t-linux64: Support TM_MULTILIB_CONFIG.
+
+	* doc/install.texi: Document --with-multilib-list for
+	Linux/x86-64.
+
+	* doc/invoke.texi: Document -mx32.
+
 2011-07-07  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	* doc/invoke.texi (mwords-little-endian): Deprecate.
diff --git a/gcc/config.gcc b/gcc/config.gcc
index c590577..f8d7274 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1281,6 +1281,22 @@ i[34567]86-*-linux* | i[34567]86-*-kfreebsd*-gnu | i[34567]86-*-knetbsd*-gnu | i
 			tm_file="${tm_file} i386/x86-64.h i386/gnu-user64.h i386/linux64.h"
 			tm_defines="${tm_defines} TARGET_BI_ARCH=1"
 			tmake_file="${tmake_file} i386/t-linux64"
+			x86_multilibs="${with_multilib_list}"
+			if test "$x86_multilibs" = "default"; then
+				x86_multilibs="m64,m32"
+			fi
+			x86_multilibs=`echo $x86_multilibs | sed -e 's/,/ /g'`
+			for x86_multilib in ${x86_multilibs}; do
+				case ${x86_multilib} in
+				m32 | m64 | mx32)
+					TM_MULTILIB_CONFIG="${TM_MULTILIB_CONFIG},${x86_multilib}"
+					;;
+				*)
+					echo "--with-multilib-list=${x86_with_multilib} not supported."
+					exit 1
+				esac
+			done
+			TM_MULTILIB_CONFIG=`echo $TM_MULTILIB_CONFIG | sed 's/^,//'`
 			need_64bit_hwint=yes
 			need_64bit_isa=yes
 			case X"${with_cpu}" in
@@ -1319,6 +1335,22 @@ x86_64-*-linux* | x86_64-*-kfreebsd*-gnu | x86_64-*-knetbsd*-gnu)
 	x86_64-*-knetbsd*-gnu) tm_file="${tm_file} knetbsd-gnu.h" ;;
 	esac
 	tmake_file="${tmake_file} i386/t-linux64 i386/t-crtstuff i386/t-crtpc i386/t-crtfm t-dfprules"
+	x86_multilibs="${with_multilib_list}"
+	if test "$x86_multilibs" = "default"; then
+		x86_multilibs="m64,m32"
+	fi
+	x86_multilibs=`echo $x86_multilibs | sed -e 's/,/ /g'`
+	for x86_multilib in ${x86_multilibs}; do
+		case ${x86_multilib} in
+		m32 | m64 | mx32)
+			TM_MULTILIB_CONFIG="${TM_MULTILIB_CONFIG},${x86_multilib}"
+			;;
+		*)
+			echo "--with-multilib-list=${x86_with_multilib} not supported."
+			exit 1
+		esac
+	done
+	TM_MULTILIB_CONFIG=`echo $TM_MULTILIB_CONFIG | sed 's/^,//'`
 	;;
 i[34567]86-pc-msdosdjgpp*)
 	xm_file=i386/xm-djgpp.h
diff --git a/gcc/config/i386/gnu-user64.h b/gcc/config/i386/gnu-user64.h
index b069975..954f3b2 100644
--- a/gcc/config/i386/gnu-user64.h
+++ b/gcc/config/i386/gnu-user64.h
@@ -58,25 +58,31 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #if TARGET_64BIT_DEFAULT
 #define SPEC_32 "m32"
-#define SPEC_64 "!m32"
+#define SPEC_64 "m32|mx32:;"
+#define SPEC_X32 "mx32"
 #else
-#define SPEC_32 "!m64"
+#define SPEC_32 "m64|mx32:;"
 #define SPEC_64 "m64"
+#define SPEC_X32 "mx32"
 #endif
 
 #undef ASM_SPEC
-#define ASM_SPEC "%{" SPEC_32 ":--32} %{" SPEC_64 ":--64} \
+#define ASM_SPEC "%{" SPEC_32 ":--32} \
+ %{" SPEC_64 ":--64} \
+ %{" SPEC_X32 ":--x32} \
  %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
 
 #undef	LINK_SPEC
 #define LINK_SPEC "%{" SPEC_64 ":-m " GNU_USER_LINK_EMULATION64 "} \
                    %{" SPEC_32 ":-m " GNU_USER_LINK_EMULATION32 "} \
+                   %{" SPEC_X32 ":-m " GNU_USER_LINK_EMULATIONX32 "} \
   %{shared:-shared} \
   %{!shared: \
     %{!static: \
       %{rdynamic:-export-dynamic} \
       %{" SPEC_32 ":-dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "} \
-      %{" SPEC_64 ":-dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}} \
+      %{" SPEC_64 ":-dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "} \
+      %{" SPEC_X32 ":-dynamic-linker " GNU_USER_DYNAMIC_LINKERX32 "}} \
     %{static:-static}}"
 
 /* Similar to standard GNU userspace, but adding -ffast-math support.  */
@@ -110,10 +116,13 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #ifdef TARGET_LIBC_PROVIDES_SSP
 /* i386 glibc provides __stack_chk_guard in %gs:0x14,
+   x32 glibc provides it in %fs:0x18. 
    x86_64 glibc provides it in %fs:0x28.  */
-#define TARGET_THREAD_SSP_OFFSET	(TARGET_64BIT ? 0x28 : 0x14)
+#define TARGET_THREAD_SSP_OFFSET \
+  (TARGET_64BIT ? (TARGET_X32 ? 0x18 : 0x28) : 0x14)
 
 /* We steal the last transactional memory word.  */
 #define TARGET_CAN_SPLIT_STACK
-#define TARGET_THREAD_SPLIT_STACK_OFFSET (TARGET_64BIT ? 0x70 : 0x30)
+#define TARGET_THREAD_SPLIT_STACK_OFFSET \
+  (TARGET_64BIT ? (TARGET_X32 ? 0x40 : 0x70) : 0x30)
 #endif
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index a1ac6b6..8cef4e7 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -42,6 +42,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 /* Redefines for option macros.  */
 
 #define TARGET_64BIT	OPTION_ISA_64BIT
+#define TARGET_X32	OPTION_ISA_X32
 #define TARGET_MMX	OPTION_ISA_MMX
 #define TARGET_3DNOW	OPTION_ISA_3DNOW
 #define TARGET_3DNOW_A	OPTION_ISA_3DNOW_A
@@ -72,6 +73,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define TARGET_RDRND	OPTION_ISA_RDRND
 #define TARGET_F16C	OPTION_ISA_F16C
 
+#define TARGET_LP64	(TARGET_64BIT && !TARGET_X32)
 
 /* SSE4.1 defines round instructions */
 #define	OPTION_MASK_ISA_ROUND	OPTION_MASK_ISA_SSE4_1
@@ -516,8 +518,8 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 #define OPT_ARCH64 "!m32"
 #define OPT_ARCH32 "m32"
 #else
-#define OPT_ARCH64 "m64"
-#define OPT_ARCH32 "!m64"
+#define OPT_ARCH64 "m64|mx32"
+#define OPT_ARCH32 "m64|mx32:;"
 #endif
 
 /* Support for configure-time defaults of some command line options.
@@ -637,6 +639,8 @@ enum target_cpu_default
 
 #define SHORT_TYPE_SIZE 16
 #define INT_TYPE_SIZE 32
+#define LONG_TYPE_SIZE (TARGET_X32 ? 32 : BITS_PER_WORD)
+#define POINTER_SIZE (TARGET_X32 ? 32 : BITS_PER_WORD)
 #define LONG_LONG_TYPE_SIZE 64
 #define FLOAT_TYPE_SIZE 32
 #define DOUBLE_TYPE_SIZE 64
@@ -1742,6 +1746,13 @@ do {							\
    between pointers and any other objects of this machine mode.  */
 #define Pmode (TARGET_64BIT ? DImode : SImode)
 
+/* A C expression whose value is zero if pointers that need to be extended
+   from being `POINTER_SIZE' bits wide to `Pmode' are sign-extended and
+   greater then zero if they are zero-extended and less then zero if the
+   ptr_extend instruction should be used.  */
+
+#define POINTERS_EXTEND_UNSIGNED 1
+
 /* A function address in a call instruction
    is a byte address (for indexing purposes)
    so give the MEM rtx a byte's mode.  */
diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt
index 9886b7b..8dea93e 100644
--- a/gcc/config/i386/i386.opt
+++ b/gcc/config/i386/i386.opt
@@ -398,9 +398,13 @@ Target RejectNegative Negative(m64) Report InverseMask(ISA_64BIT) Var(ix86_isa_f
 Generate 32bit i386 code
 
 m64
-Target RejectNegative Negative(m32) Report Mask(ISA_64BIT) Var(ix86_isa_flags) Save
+Target RejectNegative Negative(mx32) Report Mask(ISA_64BIT) Var(ix86_isa_flags) Save
 Generate 64bit x86-64 code
 
+mx32
+Target RejectNegative Negative(m32) Report Mask(ISA_X32) Var(ix86_isa_flags) Save
+Generate 32bit x86-64 code
+
 mmmx
 Target Report Mask(ISA_MMX) Var(ix86_isa_flags) Save
 Support MMX built-in functions
diff --git a/gcc/config/i386/kfreebsd-gnu64.h b/gcc/config/i386/kfreebsd-gnu64.h
index c3798a5..2085ca5 100644
--- a/gcc/config/i386/kfreebsd-gnu64.h
+++ b/gcc/config/i386/kfreebsd-gnu64.h
@@ -21,6 +21,8 @@ along with GCC; see the file COPYING3.  If not see
 
 #define GNU_USER_LINK_EMULATION32 "elf_i386_fbsd"
 #define GNU_USER_LINK_EMULATION64 "elf_x86_64_fbsd"
+#define GNU_USER_LINK_EMULATIONX32 "elf32_x86_64_fbsd"
 
 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 #define GLIBC_DYNAMIC_LINKER64 "/lib/ld-kfreebsd-x86-64.so.1"
+#define GLIBC_DYNAMIC_LINKERX32 "/lib/ld-kfreebsd-x32.so.1"
diff --git a/gcc/config/i386/linux64.h b/gcc/config/i386/linux64.h
index 5d33224..5b0a212 100644
--- a/gcc/config/i386/linux64.h
+++ b/gcc/config/i386/linux64.h
@@ -26,6 +26,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #define GNU_USER_LINK_EMULATION32 "elf_i386"
 #define GNU_USER_LINK_EMULATION64 "elf_x86_64"
+#define GNU_USER_LINK_EMULATIONX32 "elf32_x86_64"
 
 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
+#define GLIBC_DYNAMIC_LINKERX32 "/libx32/ld-linux-x32.so.2"
diff --git a/gcc/config/i386/t-linux64 b/gcc/config/i386/t-linux64
index 5d5a476..ea8f5e9 100644
--- a/gcc/config/i386/t-linux64
+++ b/gcc/config/i386/t-linux64
@@ -1,4 +1,5 @@
-# Copyright (C) 2002, 2005, 2007, 2008 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2005, 2007, 2008, 2011
+# Free Software Foundation, Inc.
 #
 # This file is part of GCC.
 #
@@ -23,9 +24,19 @@
 # it doesn't tell anything about the 32bit libraries on those systems.  Set
 # MULTILIB_OSDIRNAMES according to what is found on the target.
 
-MULTILIB_OPTIONS = m64/m32
-MULTILIB_DIRNAMES = 64 32 
-MULTILIB_OSDIRNAMES = ../lib64 $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)
+# To support i386, x86-64 and x32 libraries, the directory structrue
+# should be:
+#
+# 	/lib has i386 libraries.
+# 	/lib64 has x86-64 libraries.
+# 	/libx32 has x32 libraries.
+#
+comma=,
+MULTILIB_OPTIONS    = $(subst $(comma),/,$(TM_MULTILIB_CONFIG))
+MULTILIB_DIRNAMES   = $(patsubst m%, %, $(subst /, ,$(MULTILIB_OPTIONS)))
+MULTILIB_OSDIRNAMES = m64=../lib64
+MULTILIB_OSDIRNAMES+= m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)
+MULTILIB_OSDIRNAMES+= mx32=../libx32
 
 LIBGCC = stmp-multilib
 INSTALL_LIBGCC = install-multilib
diff --git a/gcc/config/linux.h b/gcc/config/linux.h
index fc897b1..dbbeea5 100644
--- a/gcc/config/linux.h
+++ b/gcc/config/linux.h
@@ -77,9 +77,11 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
+#define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0"
 #define BIONIC_DYNAMIC_LINKER "/system/bin/linker"
 #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker"
 #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64"
+#define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32"
 
 #define GNU_USER_DYNAMIC_LINKER						\
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER,	\
@@ -90,6 +92,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define GNU_USER_DYNAMIC_LINKER64					\
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
 			 BIONIC_DYNAMIC_LINKER64)
+#define GNU_USER_DYNAMIC_LINKERX32					\
+  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \
+			 BIONIC_DYNAMIC_LINKERX32)
 
 /* Determine whether the entire c99 runtime
    is present in the runtime library.  */
diff --git a/gcc/configure b/gcc/configure
index 3c717c0..9fb4317 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -1655,7 +1655,7 @@ Optional Packages:
   --with-specs=SPECS      add SPECS to driver command-line processing
   --with-pkgversion=PKG   Use PKG in the version string in place of "GCC"
   --with-bugurl=URL       Direct users to URL to report a bug
-  --with-multilib-list    select multilibs (SH only)
+  --with-multilib-list    select multilibs (SH and x86-64 only)
   --with-gnu-ld           assume the C compiler uses GNU ld default=no
   --with-libiconv-prefix[=DIR]  search for libiconv in DIR/include and DIR/lib
   --without-libiconv-prefix     don't search for libiconv in includedir and libdir
diff --git a/gcc/configure.ac b/gcc/configure.ac
index f899991..c2163bf 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -795,7 +795,7 @@ esac],
 [enable_languages=c])
 
 AC_ARG_WITH(multilib-list,
-[AS_HELP_STRING([--with-multilib-list], [select multilibs (SH only)])],
+[AS_HELP_STRING([--with-multilib-list], [select multilibs (SH and x86-64 only)])],
 :,
 with_multilib_list=default)
 
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index f93413f..833b4c9 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -1049,8 +1049,10 @@ sysv, aix.
 @item --with-multilib-list=@var{list}
 @itemx --without-multilib-list
 Specify what multilibs to build.
-Currently only implemented for sh*-*-*.
+Currently only implemented for sh*-*-* and x86-64-*-linux*.
 
+@table @code
+@item sh*-*-*
 @var{list} is a comma separated list of CPU names.  These must be of the
 form @code{sh*} or @code{m*} (in which case they match the compiler option
 for that processor).  The list should not contain any endian options -
@@ -1082,6 +1084,16 @@ only little endian SH4AL:
 --with-multilib-list=sh4al,!mb/m4al
 @end smallexample
 
+@item x86-64-*-linux*
+@var{list} is a comma separated list of @code{m32}, @code{m64} and
+@code{mx32} to enable 32-bit, 64-bit and x32 run-time libraries,
+respectively.  If @var{list} is empty, then there will be no multilibs
+and only the default run-time library will be enabled.
+
+If @option{--with-multilib-list} is not given, then only 32-bit and
+64-bit run-time libraries will be enabled.
+@end table
+
 @item --with-endian=@var{endians}
 Specify what endians to use.
 Currently only implemented for sh*-*-*.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index c8ec451..f146cc5 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -610,7 +610,7 @@ Objective-C and Objective-C++ Dialects}.
 -mpc32 -mpc64 -mpc80 -mstackrealign @gol
 -momit-leaf-frame-pointer  -mno-red-zone -mno-tls-direct-seg-refs @gol
 -mcmodel=@var{code-model} -mabi=@var{name} @gol
--m32  -m64 -mlarge-data-threshold=@var{num} @gol
+-m32 -m64 -mx32 -mlarge-data-threshold=@var{num} @gol
 -msse2avx -mfentry -m8bit-idiv @gol
 -mavx256-split-unaligned-load -mavx256-split-unaligned-store}
 
@@ -12853,15 +12853,19 @@ on AMD x86-64 processors in 64-bit environments.
 @table @gcctabopt
 @item -m32
 @itemx -m64
+@itemx -mx32
 @opindex m32
 @opindex m64
+@opindex mx32
 Generate code for a 32-bit or 64-bit environment.
-The 32-bit environment sets int, long and pointer to 32 bits and
+The @option{-m32} option sets int, long and pointer to 32 bits and
 generates code that runs on any i386 system.
-The 64-bit environment sets int to 32 bits and long and pointer
-to 64 bits and generates code for AMD's x86-64 architecture. For
-darwin only the -m64 option turns off the @option{-fno-pic} and
-@option{-mdynamic-no-pic} options.
+The @option{-m64} option sets int to 32 bits and long and pointer
+to 64 bits and generates code for AMD's x86-64 architecture.
+The @option{-mx32} option sets int, long and pointer to 32 bits and
+generates code for AMD's x86-64 architecture.
+For darwin only the @option{-m64} option turns off the @option{-fno-pic}
+and @option{-mdynamic-no-pic} options.
 
 @item -mno-red-zone
 @opindex mno-red-zone