Update.

1998-09-20 09:37  Ulrich Drepper  <drepper@cygnus.com>

	* elf/Versions [GLIBC_2.1] (libc): Add __fpu_control.
	* elf/elf.h: Add AT_FPUCW.
	* elf/Makefile (dl-routines): Add fpu_control.
	(elide-routines.os): Add fpu_control.
	(rtld-routines): Add fpu_control.
	* math/Makefile (aux): Remove fpu_control.
	* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): Handle AT_FPUCW.
	(_dl_show_auxv): Likewise.
	* sysdeps/unix/sysv/linux/init-first.c (init): Use __setfpucw only
	if different from OS default.

	* stdio-common/tstscanf.c: Add test case for (nil).

diff --git a/ChangeLog b/ChangeLog
index 10b7215..cc83838 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+1998-09-20 09:37  Ulrich Drepper  <drepper@cygnus.com>
+
+       * elf/Versions [GLIBC_2.1] (libc): Add __fpu_control.
+       * elf/elf.h: Add AT_FPUCW.
+       * elf/Makefile (dl-routines): Add fpu_control.
+       (elide-routines.os): Add fpu_control.
+       (rtld-routines): Add fpu_control.
+       * math/Makefile (aux): Remove fpu_control.
+       * sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): Handle AT_FPUCW.
+       (_dl_show_auxv): Likewise.
+       * sysdeps/unix/sysv/linux/init-first.c (init): Use __setfpucw only
+       if different from OS default.
+
+       * stdio-common/tstscanf.c: Add test case for (nil).
+
 1998-09-18 17:41  Ulrich Drepper  <drepper@cygnus.com>
 
        * libio/fileops.c (_IO_new_file_underflow): Before allocating

diff --git a/elf/Makefile b/elf/Makefile
index ddd9d22..6da5e8c 100644 (file)
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -28,13 +28,15 @@ routines    = $(dl-routines) dl-open dl-close dl-symbol dl-support \
 # profiled libraries.
 dl-routines    = $(addprefix dl-,load cache lookup object reloc deps \
                                  runtime error init fini debug misc \
-                                 version profile)
+                                 version profile) \
+                 fpu_control
 # But they are absent from the shared libc, because that code is in ld.so.
-elide-routines.os = $(dl-routines) dl-support enbl-secure
+elide-routines.os = $(dl-routines) dl-support enbl-secure fpu_control
 
 # ld.so uses those routines, plus some special stuff for being the program
 # interpreter and operating independent of libc.
-rtld-routines  := rtld $(dl-routines) dl-sysdep dl-environ dl-minimal
+rtld-routines  := rtld $(dl-routines) dl-sysdep dl-environ dl-minimal \
+                  fpu_control
 distribute     = $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
                  dl-hash.h soinit.c sofini.c ldd.bash.in eval.c \
                  genrtldtbl.awk atomicity.h dl-procinfo.h ldsodefs.h \

diff --git a/elf/Versions b/elf/Versions
index 29795ce..2c93632 100644 (file)
--- a/elf/Versions
+++ b/elf/Versions
@@ -19,7 +19,7 @@ libc {
   GLIBC_2.1 {
     # global variables
     _dl_profile; _dl_profile_map; _dl_profile_output; _dl_start_profile;
-    _dl_loaded; _dl_main_searchlist;
+    _dl_loaded; _dl_main_searchlist; __fpu_control;
 
     # functions used in other libraries
     _dl_mcount; _dl_mcount_wrapper; _dl_mcount_wrapper_check; _dl_unload_cache;

diff --git a/elf/elf.h b/elf/elf.h
index a797cb5..7a53c77 100644 (file)
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -777,6 +777,10 @@ typedef struct
 #define AT_HWCAP       16              /* Machine dependent hints about
                                           processor capabilities.  */
 
+/* This entry gives some information about the FPU initialization
+   performed by the kernel.  */
+#define AT_FPUCW       17              /* Used FPU control word.  */
+
 
 /* Note section contents.  Each entry in the note section begins with
    a header of a fixed form.  */

diff --git a/math/Makefile b/math/Makefile
index ee39968..6988e8b 100644 (file)
--- a/math/Makefile
+++ b/math/Makefile
@@ -29,7 +29,7 @@ headers               := math.h bits/mathcalls.h bits/mathinline.h bits/huge_val.h \
 distribute     := math_private.h machine/asm.h machine/endian.h
 
 # FPU support code.
-aux            := fpu_control setfpucw
+aux            := setfpucw
 
 # Build the -lm library.
 

diff --git a/stdio-common/tstscanf.c b/stdio-common/tstscanf.c
index 3e6e496..52473cd 100644 (file)
--- a/stdio-common/tstscanf.c
+++ b/stdio-common/tstscanf.c
@@ -219,5 +219,21 @@ main (int argc, char **argv)
       }
   }
 
+  fputs ("Test 6:\n", stdout);
+  {
+    char *p = (char *) -1;
+    int res;
+
+    sprintf (buf, "%p", NULL);
+    res = sscanf (buf, "%p", &p);
+    printf ("sscanf (\"%s\", \"%%p\", &p) = %d, p == %p\n", buf, res, p);
+
+    if (res != 1 || p != NULL)
+      {
+       fputs ("test failed!\n", stdout);
+       result = 1;
+      }
+  }
+
   exit (result);
 }

diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c
index 15f8555..120f362 100644 (file)
--- a/sysdeps/generic/dl-sysdep.c
+++ b/sysdeps/generic/dl-sysdep.c
@@ -28,6 +28,7 @@
 #include <sys/mman.h>
 #include <elf/ldsodefs.h>
 #include <stdio-common/_itoa.h>
+#include <fpu_control.h>
 
 #include <entry.h>
 #include <dl-machine.h>
@@ -126,6 +127,9 @@ _dl_sysdep_start (void **start_argptr,
       case AT_HWCAP:
        _dl_hwcap = av->a_un.a_val;
        break;
+      case AT_FPUCW:
+       __fpu_control = av->a_un.a_val;
+       break;
       }
 
   /* Linux doesn't provide us with any of these values on the stack
@@ -249,6 +253,12 @@ _dl_show_auxv (void)
                                          16, 0),
                              "\n", NULL);
        break;
+      case AT_FPUCW:
+       _dl_sysdep_message ("AT_FPUCW:     ",
+                           _itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
+                                       10, 0),
+                           "\n", NULL);
+       break;
       }
 }
 

diff --git a/sysdeps/unix/sysv/linux/init-first.c b/sysdeps/unix/sysv/linux/init-first.c
index 0931e99..4b7af46 100644 (file)
--- a/sysdeps/unix/sysv/linux/init-first.c
+++ b/sysdeps/unix/sysv/linux/init-first.c
@@ -60,8 +60,10 @@ init (int argc, char **argv, char **envp)
         the executable format.  */
       __personality (PER_LINUX);
 
-      /* Set the FPU control word to the proper default value.  */
-      __setfpucw (__fpu_control);
+      /* Set the FPU control word to the proper default value if the
+        kernel would use a different value.  */
+      if (__fpu_control != _FPU_DEFAULT)
+       __setfpucw (__fpu_control);
     }
 
   /* Save the command-line arguments.  */