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).
This commit is contained in:
Ulrich Drepper
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c53a89d434
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a0780919b4
15
ChangeLog
15
ChangeLog
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@ -1,3 +1,18 @@
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1998-09-20 09:37 Ulrich Drepper <drepper@cygnus.com>
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* elf/Versions [GLIBC_2.1] (libc): Add __fpu_control.
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* elf/elf.h: Add AT_FPUCW.
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* elf/Makefile (dl-routines): Add fpu_control.
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(elide-routines.os): Add fpu_control.
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(rtld-routines): Add fpu_control.
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* math/Makefile (aux): Remove fpu_control.
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* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): Handle AT_FPUCW.
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(_dl_show_auxv): Likewise.
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* sysdeps/unix/sysv/linux/init-first.c (init): Use __setfpucw only
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if different from OS default.
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* stdio-common/tstscanf.c: Add test case for (nil).
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1998-09-18 17:41 Ulrich Drepper <drepper@cygnus.com>
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* libio/fileops.c (_IO_new_file_underflow): Before allocating
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@ -28,13 +28,15 @@ routines = $(dl-routines) dl-open dl-close dl-symbol dl-support \
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# profiled libraries.
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dl-routines = $(addprefix dl-,load cache lookup object reloc deps \
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runtime error init fini debug misc \
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version profile)
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version profile) \
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fpu_control
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# But they are absent from the shared libc, because that code is in ld.so.
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elide-routines.os = $(dl-routines) dl-support enbl-secure
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elide-routines.os = $(dl-routines) dl-support enbl-secure fpu_control
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# ld.so uses those routines, plus some special stuff for being the program
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# interpreter and operating independent of libc.
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rtld-routines := rtld $(dl-routines) dl-sysdep dl-environ dl-minimal
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rtld-routines := rtld $(dl-routines) dl-sysdep dl-environ dl-minimal \
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fpu_control
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distribute = $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
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dl-hash.h soinit.c sofini.c ldd.bash.in eval.c \
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genrtldtbl.awk atomicity.h dl-procinfo.h ldsodefs.h \
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@ -19,7 +19,7 @@ libc {
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GLIBC_2.1 {
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# global variables
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_dl_profile; _dl_profile_map; _dl_profile_output; _dl_start_profile;
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_dl_loaded; _dl_main_searchlist;
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_dl_loaded; _dl_main_searchlist; __fpu_control;
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# functions used in other libraries
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_dl_mcount; _dl_mcount_wrapper; _dl_mcount_wrapper_check; _dl_unload_cache;
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@ -777,6 +777,10 @@ typedef struct
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#define AT_HWCAP 16 /* Machine dependent hints about
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processor capabilities. */
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/* This entry gives some information about the FPU initialization
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performed by the kernel. */
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#define AT_FPUCW 17 /* Used FPU control word. */
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/* Note section contents. Each entry in the note section begins with
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a header of a fixed form. */
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@ -29,7 +29,7 @@ headers := math.h bits/mathcalls.h bits/mathinline.h bits/huge_val.h \
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distribute := math_private.h machine/asm.h machine/endian.h
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# FPU support code.
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aux := fpu_control setfpucw
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aux := setfpucw
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# Build the -lm library.
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@ -219,5 +219,21 @@ main (int argc, char **argv)
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}
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}
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fputs ("Test 6:\n", stdout);
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{
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char *p = (char *) -1;
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int res;
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sprintf (buf, "%p", NULL);
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res = sscanf (buf, "%p", &p);
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printf ("sscanf (\"%s\", \"%%p\", &p) = %d, p == %p\n", buf, res, p);
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if (res != 1 || p != NULL)
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{
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fputs ("test failed!\n", stdout);
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result = 1;
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}
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}
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exit (result);
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}
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@ -28,6 +28,7 @@
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#include <sys/mman.h>
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#include <elf/ldsodefs.h>
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#include <stdio-common/_itoa.h>
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#include <fpu_control.h>
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#include <entry.h>
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#include <dl-machine.h>
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@ -126,6 +127,9 @@ _dl_sysdep_start (void **start_argptr,
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case AT_HWCAP:
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_dl_hwcap = av->a_un.a_val;
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break;
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case AT_FPUCW:
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__fpu_control = av->a_un.a_val;
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break;
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}
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/* Linux doesn't provide us with any of these values on the stack
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@ -249,6 +253,12 @@ _dl_show_auxv (void)
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16, 0),
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"\n", NULL);
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break;
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case AT_FPUCW:
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_dl_sysdep_message ("AT_FPUCW: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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}
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}
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@ -60,8 +60,10 @@ init (int argc, char **argv, char **envp)
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the executable format. */
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__personality (PER_LINUX);
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/* Set the FPU control word to the proper default value. */
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__setfpucw (__fpu_control);
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/* Set the FPU control word to the proper default value if the
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kernel would use a different value. */
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if (__fpu_control != _FPU_DEFAULT)
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__setfpucw (__fpu_control);
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}
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/* Save the command-line arguments. */
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