Add support for MIPS O32 FPXX and .MIPS.abiflags

	* elf/elf.h (PT_MIPS_ABIFLAGS): Define.
	(Elf_MIPS_ABIFlags_v0): New structure.
	(EF_MIPS_FP64): Define.
	(MIPS_AFL_REG_NONE, MIPS_AFL_REG_32, MIPS_AFL_REG_64): Likewise.
	(MIPS_AFL_REG_128, MIPS_AFL_ASE_DSP, MIPS_AFL_ASE_DSP64): Likewise.
	(MIPS_AFL_ASE_DSPR2, MIPS_AFL_ASE_EVA, MIPS_AFL_ASE_MCU): Likewise.
	(MIPS_AFL_ASE_MDMX, MIPS_AFL_ASE_MIPS3D, MIPS_AFL_ASE_MT): Likewise.
	(MIPS_AFL_ASE_SMARTMIPS, MIPS_AFL_ASE_VIRT): Likewise.
	(MIPS_AFL_ASE_VIRT64, MIPS_AFL_ASE_MSA, MIPS_AFL_ASE_MSA64): Likewise.
	(MIPS_AFL_ASE_MIPS16, MIPS_AFL_ASE_MICROMIPS): Likewise.
	(MIPS_AFL_ASE_XPA, MIPS_AFL_EXT_XLR, MIPS_AFL_EXT_OCTEON2): Likewise.
	(MIPS_AFL_EXT_OCTEONP, MIPS_AFL_EXT_LOONGSON_3A): Likewise.
	(MIPS_AFL_EXT_OCTEON, MIPS_AFL_EXT_5900, MIPS_AFL_EXT_4010): Likewise.
	(MIPS_AFL_EXT_4100, MIPS_AFL_EXT_3900, MIPS_AFL_EXT_10000): Likewise.
	(MIPS_AFL_EXT_SB1, MIPS_AFL_EXT_4111, MIPS_AFL_EXT_4120): Likewise.
	(MIPS_AFL_EXT_5400, MIPS_AFL_EXT_5500): Likewise.
	(MIPS_AFL_EXT_LOONGSON_2E, MIPS_AFL_EXT_LOONGSON_2F): Likewise.
	(Val_GNU_MIPS_ABI_FP_ANY, Val_GNU_MIPS_ABI_FP_DOUBLE): New enum values.
	(Val_GNU_MIPS_ABI_FP_SINGLE, Val_GNU_MIPS_ABI_FP_SOFT): Likewise.
	(Val_GNU_MIPS_ABI_FP_OLD_64, Val_GNU_MIPS_ABI_FP_XX): Likewise.
	(Val_GNU_MIPS_ABI_FP_64, Val_GNU_MIPS_ABI_FP_64A): Likewise.
	(Val_GNU_MIPS_ABI_FP_MAX): Likewise.
	* sysdeps/mips/Makefile [subdir=elf]: Add tst-abi-interlink,
	tst-mode-switch-1, tst-mode-switch-2, tst-mode-switch-3 tests.
	* sysdeps/mips/bits/linkmap.h (struct link_map_machine): Add fpmode
	field.
	* sysdeps/mips/dl-machine.h (elf_machine_matches_host): Reject
	EF_MIPS_FP64.
	* sysdeps/mips/dl-machine-reject-phdr.h: New file.
	* sysdeps/mips/tst-abi-fp32mod.c: Likewise.
	* sysdeps/mips/tst-abi-fpxxmod.c: Likewise.
	* sysdeps/mips/tst-abi-fpxxomod.c: Likewise.
	* sysdeps/mips/tst-abi-fp64mod.c: Likewise.
	* sysdeps/mips/tst-abi-fp64amod.c: Likewise.
	* sysdeps/mips/tst-abi-interlink.c: Likewise.
	* sysdeps/mips/tst-mode-switch-1.c: Likewise.
	* sysdeps/mips/tst-mode-switch-2.c: Likewise.
	* sysdeps/mips/tst-mode-switch-3.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/configure.ac (o32-fpabi): Define to
	record the current FP ABI extension.
	(mips-mode-switch): Define to show if kernel headers support mode
	switching.
	* sysdeps/unix/sysv/linux/mips/configure: Regenerate.
	* sysdeps/unix/sysv/linux/mips/ldsodefs.h: Increase maximum
	supported SYSV ABI version to 3.
	* sysdeps/unix/sysv/linux/mips/libc-abis: Add new MIPS_O32_FP64
	feature.

4 files changed, 199 insertions, 1 deletions

diff --git a/sysdeps/unix/sysv/linux/mips/configure b/sysdeps/unix/sysv/linux/mips/configure
index 6db1f80a4f..83f8b13aab 100644
--- a/sysdeps/unix/sysv/linux/mips/configure
+++ b/sysdeps/unix/sysv/linux/mips/configure
@@ -105,6 +105,148 @@ if test -z "$libc_mips_float"; then
   as_fn_error $? "could not determine if compiler is using hard or soft floating point ABI" "$LINENO" 5
 fi
 
+libc_mips_o32_fp=
+
+if test x"$libc_mips_abi" = xo32 -a x"$libc_mips_float" = xhard; then
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+      #if !defined(__mips_fpr)
+      #error Missing FPR sizes
+      #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+        #if (__mips_fpr != 32)
+        #error Not FP32
+        #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=32
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+          #if (__mips_fpr != 0) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+          #error Not FPXX (without odd single-precision registers)
+          #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=xx
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+            #if (__mips_fpr != 0)
+            #error Not FPXX (with odd single precision registers)
+            #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=xxo
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+              #if (__mips_fpr != 64) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+              #error Not FP64A
+              #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=64a
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+                #if (__mips_fpr != 64)
+                #error Not FP64
+                #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=64
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+config_vars="$config_vars
+o32-fpabi = ${libc_mips_o32_fp}"
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+    #include <linux/prctl.h>
+    #if !defined(PR_GET_FP_MODE) || !defined(PR_SET_FP_MODE)
+    #error New prctl support for setting FP modes not found
+    #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_mode_switch=yes
+else
+  libc_mips_mode_switch=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+config_vars="$config_vars
+mips-mode-switch = ${libc_mips_mode_switch}"
+
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
 $as_echo_n "checking for grep that handles long lines and -e... " >&6; }
diff --git a/sysdeps/unix/sysv/linux/mips/configure.ac b/sysdeps/unix/sysv/linux/mips/configure.ac
index c3f217a34f..5039ec969f 100644
--- a/sysdeps/unix/sysv/linux/mips/configure.ac
+++ b/sysdeps/unix/sysv/linux/mips/configure.ac
@@ -44,6 +44,59 @@ if test -z "$libc_mips_float"; then
   AC_MSG_ERROR([could not determine if compiler is using hard or soft floating point ABI])
 fi
 
+libc_mips_o32_fp=
+
+if test x"$libc_mips_abi" = xo32 -a x"$libc_mips_float" = xhard; then
+  AC_COMPILE_IFELSE(
+    [AC_LANG_PROGRAM([
+      #if !defined(__mips_fpr)
+      #error Missing FPR sizes
+      #endif])],
+    [AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM([
+        #if (__mips_fpr != 32)
+        #error Not FP32
+        #endif])],
+      [libc_mips_o32_fp=32],
+      [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([
+          #if (__mips_fpr != 0) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+          #error Not FPXX (without odd single-precision registers)
+          #endif])],
+        [libc_mips_o32_fp=xx],
+        [AC_COMPILE_IFELSE(
+          [AC_LANG_PROGRAM([
+            #if (__mips_fpr != 0)
+            #error Not FPXX (with odd single precision registers)
+            #endif])],
+          [libc_mips_o32_fp=xxo],
+          [AC_COMPILE_IFELSE(
+            [AC_LANG_PROGRAM([
+              #if (__mips_fpr != 64) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+              #error Not FP64A
+              #endif])],
+            [libc_mips_o32_fp=64a],
+            [AC_COMPILE_IFELSE(
+              [AC_LANG_PROGRAM([
+                #if (__mips_fpr != 64)
+                #error Not FP64
+                #endif])],
+              [libc_mips_o32_fp=64],
+              [])])])])])],
+    [])
+fi
+LIBC_CONFIG_VAR([o32-fpabi],[${libc_mips_o32_fp}])
+
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM([
+    #include <linux/prctl.h>
+    #if !defined(PR_GET_FP_MODE) || !defined(PR_SET_FP_MODE)
+    #error New prctl support for setting FP modes not found
+    #endif])],
+  [libc_mips_mode_switch=yes],
+  [libc_mips_mode_switch=no])
+LIBC_CONFIG_VAR([mips-mode-switch],[${libc_mips_mode_switch}])
+
 AC_CACHE_CHECK([whether the compiler is using the 2008 NaN encoding],
   libc_cv_mips_nan2008, [AC_EGREP_CPP(yes, [dnl
 #ifdef __mips_nan2008
diff --git a/sysdeps/unix/sysv/linux/mips/ldsodefs.h b/sysdeps/unix/sysv/linux/mips/ldsodefs.h
index d7c62f4b9c..70f8f16956 100644
--- a/sysdeps/unix/sysv/linux/mips/ldsodefs.h
+++ b/sysdeps/unix/sysv/linux/mips/ldsodefs.h
@@ -34,7 +34,7 @@ extern void _dl_static_init (struct link_map *map);
 #undef VALID_ELF_ABIVERSION
 #define VALID_ELF_ABIVERSION(osabi,ver)			\
   (ver == 0						\
-   || (osabi == ELFOSABI_SYSV && ver < 2)		\
+   || (osabi == ELFOSABI_SYSV && ver < 4)		\
    || (osabi == ELFOSABI_GNU && ver < LIBC_ABI_MAX))
 
 #endif /* ldsodefs.h */
diff --git a/sysdeps/unix/sysv/linux/mips/libc-abis b/sysdeps/unix/sysv/linux/mips/libc-abis
index f180a03efd..14ff60322a 100644
--- a/sysdeps/unix/sysv/linux/mips/libc-abis
+++ b/sysdeps/unix/sysv/linux/mips/libc-abis
@@ -11,3 +11,6 @@ MIPS_PLT	mips*-*-linux*
 # Unique symbol definitions for C++.
 # Architecture independent, all ELF targets (== all targets)
 UNIQUE
+#
+# MIPS O32 FP64
+MIPS_O32_FP64   mips*-*-linux*