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Update comment about _SLOWDOWN flags.

This commit is contained in:
Ulrich Drepper 2000-03-20 00:46:01 +00:00
parent 4cec02b2ba
commit 460adbb847
7 changed files with 1425 additions and 752 deletions
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13
elf/Makefile
View File

@ -157,11 +157,18 @@ CPPFLAGS-dl-load.c = -I$(objpfx).
ifeq (yes,$(build-shared))
$(inst_slibdir)/$(rtld-version-installed-name): $(objpfx)ld.so $(+force)
$(do-install-program)
$(make-target-directory)
$(INSTALL_PROGRAM) $< $@.new
$(inst_slibdir)/$(rtld-installed-name): \
$(inst_slibdir)/$(rtld-version-installed-name)
$(make-shlib-link)
$(inst_slibdir)/$(rtld-version-installed-name) \
$(inst_slibdir)/libc-$(version).so
rm -f $@ $<
$(symbolic-link-prog) $<.new $@
ln $<.new $<
rm -f $@
$(symbolic-link-prog) $(<F) $@
rm -f $<.new
# Special target called by parent to install just the dynamic linker.
.PHONY: ldso_install

3
manual/pattern.texi
View File

@ -142,7 +142,8 @@ extensions.
@table @code
@item gl_pathc
The number of elements in the vector.
The number of elements in the vector, excluding the initial null entries
if the GLOB_DOOFFS flag is used (see gl_offs below).
@item gl_pathv
The address of the vector. This field has type @w{@code{char **}}.

1826
po/fr.po
View File

File diff suppressed because it is too large Load Diff

19
posix/globtest.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
/* Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -29,7 +29,9 @@ main (int argc, char *argv[])
glob_t g;
int quotes = 1;
while ((i = getopt (argc, argv, "bcdegmopqstT")) != -1)
g.gl_offs = 0;
while ((i = getopt (argc, argv, "bcdeEgmopqstT")) != -1)
switch(i)
{
case 'b':
@ -44,6 +46,9 @@ main (int argc, char *argv[])
case 'e':
glob_flags |= GLOB_NOESCAPE;
break;
case 'E':
glob_flags |= GLOB_ERR;
break;
case 'g':
glob_flags |= GLOB_NOMAGIC;
break;
@ -96,15 +101,17 @@ main (int argc, char *argv[])
else if (i == GLOB_NOMATCH)
puts ("GLOB_NOMATCH");
/* If we set an offset, fill in the first field. */
if (glob_flags & GLOB_DOOFFS)
/* If we set an offset, fill in the first field.
(Unless glob() has filled it in already - which is an error) */
if ((glob_flags & GLOB_DOOFFS) && g.gl_pathv[0] == NULL)
g.gl_pathv[0] = (char *) "abc";
/* Print out the names. Unless otherwise specified, qoute them. */
if (g.gl_pathv)
{
for (i = 0; i < g.gl_pathc; ++i)
printf ("%s%s%s\n", quotes ? "`" : "", g.gl_pathv[i],
for (i = 0; i < g.gl_offs + g.gl_pathc; ++i)
printf ("%s%s%s\n", quotes ? "`" : "",
g.gl_pathv[i] ? g.gl_pathv[i] : "(null)",
quotes ? "'" : "");
}
return 0;

76
posix/globtest.sh
View File

@ -27,9 +27,9 @@ export LANG
testdir=$TMPDIR/globtest-dir
testout=$TMPDIR/globtest-out
trap 'rm -fr $testdir $testout' 1 2 3 15
trap 'chmod 777 $testdir/noread; rm -fr $testdir $testout' 1 2 3 15
rm -fr $testdir
rm -fr $testdir 2>/dev/null
mkdir $testdir
echo 1 > $testdir/file1
echo 2 > $testdir/file2
@ -39,6 +39,8 @@ echo 5 > $testdir/.file5
echo 6 > $testdir/'*file6'
mkdir $testdir/dir1
mkdir $testdir/dir2
test -d $testdir/noread || mkdir $testdir/noread
chmod a-r $testdir/noread
echo 1_1 > $testdir/dir1/file1_1
echo 1_2 > $testdir/dir1/file1_2
@ -56,6 +58,7 @@ cat <<"EOF" | cmp - $testout || result=1
`dir2'
`file1'
`file2'
`noread'
`~file4'
EOF
@ -70,6 +73,7 @@ cat <<"EOF" | cmp - $testout || result=1
`dir2'
`file1'
`file2'
`noread'
`~file4'
EOF
@ -84,6 +88,7 @@ cat <<"EOF" | cmp - $testout || result=1
`dir2/'
`file1'
`file2'
`noread/'
`~file4'
EOF
@ -101,6 +106,7 @@ cat <<"EOF" | cmp - $testout || result=1
`dir2'
`file1'
`file2'
`noread'
`~file4'
EOF
@ -201,6 +207,24 @@ cat <<"EOF" | cmp - $testout || result=1
`dir1/file1_2'
EOF
# Test subdirs with [ .. ]
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest "$testdir" "*/file1_[12]" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
`dir1/file1_1'
`dir1/file1_2'
EOF
# Test ']' inside bracket expression
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest "$testdir" "dir1/file1_[]12]" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
`dir1/file1_1'
`dir1/file1_2'
EOF
# Test tilde expansion
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest -q -t "$testdir" "~" |
@ -243,6 +267,14 @@ cat <<"EOF" | cmp - $testout || result=1
GLOB_NOMATCH
EOF
# Matching \*file6 should find *file6
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest "$testdir" "\*file6" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
`*file6'
EOF
# Try a recursive failed search
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest -e "$testdir" "a*/*" |
@ -251,6 +283,44 @@ cat <<"EOF" | cmp - $testout || result=1
GLOB_NOMATCH
EOF
# ... with GLOB_ERR
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest -E "$testdir" "a*/*" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
GLOB_NOMATCH
EOF
# Try a recursive search in unreadable directory
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest "$testdir" "noread/*" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
GLOB_NOMATCH
EOF
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest "$testdir" "noread*/*" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
GLOB_NOMATCH
EOF
# ... with GLOB_ERR
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest -E "$testdir" "noread/*" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
GLOB_ABORTED
EOF
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest -E "$testdir" "noread*/*" |
sort > $testout
cat <<"EOF" | cmp - $testout || result=1
GLOB_ABORTED
EOF
# Try multiple patterns (GLOB_APPEND)
${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
${common_objpfx}posix/globtest "$testdir" "file1" "*/*" |
@ -279,9 +349,11 @@ sort > $testout
cat <<"EOF" | cmp - $testout || result=1
`dir1/blahblah'
`dir2/blahblah'
`noread/blahblah'
EOF
if test $result -eq 0; then
chmod 777 $testdir/noread
rm -fr $testdir $testout
fi

224
sysdeps/generic/glob.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
/* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
@ -248,9 +248,16 @@ extern char *alloca ();
# define readdir(str) __readdir (str)
# define getpwnam_r(name, bufp, buf, len, res) \
__getpwnam_r (name, bufp, buf, len, res)
# ifndef __stat
# define __stat(fname, buf) __xstat (_STAT_VER, fname, buf)
# ifndef __stat64
# define __stat64(fname, buf) __xstat64 (_STAT_VER, fname, buf)
# endif
# define HAVE_STAT64 1
#endif
#ifndef HAVE_STAT64
# define __stat64(fname, buf) __stat (fname, buf)
/* This is the variable name we are using. */
# define st64 st
#endif
#if !(defined STDC_HEADERS || defined __GNU_LIBRARY__)
@ -372,6 +379,11 @@ glob (pattern, flags, errfunc, pglob)
return -1;
}
if (!(flags & GLOB_DOOFFS))
/* Have to do this so `globfree' knows where to start freeing. It
also makes all the code that uses gl_offs simpler. */
pglob->gl_offs = 0;
if (flags & GLOB_BRACE)
{
const char *begin = strchr (pattern, '{');
@ -598,10 +610,22 @@ glob (pattern, flags, errfunc, pglob)
if (!(flags & GLOB_APPEND))
{
pglob->gl_pathc = 0;
pglob->gl_pathv = NULL;
if (!(flags & GLOB_DOOFFS))
pglob->gl_pathv = NULL;
else
{
int i;
pglob->gl_pathv = (char **) malloc ((pglob->gl_offs + 1)
* sizeof (char *));
if (pglob->gl_pathv == NULL)
return GLOB_NOSPACE;
for (i = 0; i <= pglob->gl_offs; ++i)
pglob->gl_pathv[i] = NULL;
}
}
oldcount = pglob->gl_pathc;
oldcount = pglob->gl_pathc + pglob->gl_offs;
#ifndef VMS
if ((flags & (GLOB_TILDE|GLOB_TILDE_CHECK)) && dirname[0] == '~')
@ -785,45 +809,42 @@ glob (pattern, flags, errfunc, pglob)
if (filename == NULL)
{
struct stat st;
#ifdef HAVE_STAT64
struct stat64 st64;
#endif
/* Return the directory if we don't check for error or if it exists. */
if ((flags & GLOB_NOCHECK)
|| (((flags & GLOB_ALTDIRFUNC)
? (*pglob->gl_stat) (dirname, &st)
: __stat (dirname, &st)) == 0
&& S_ISDIR (st.st_mode)))
? ((*pglob->gl_stat) (dirname, &st) == 0
&& S_ISDIR (st.st_mode))
: (__stat64 (dirname, &st64) == 0 && S_ISDIR (st64.st_mode)))))
{
int newcount = pglob->gl_pathc + pglob->gl_offs;
pglob->gl_pathv
= (char **) realloc (pglob->gl_pathv,
(pglob->gl_pathc +
((flags & GLOB_DOOFFS) ?
pglob->gl_offs : 0) +
1 + 1) *
sizeof (char *));
(newcount + 1 + 1) * sizeof (char *));
if (pglob->gl_pathv == NULL)
return GLOB_NOSPACE;
if (flags & GLOB_DOOFFS)
while (pglob->gl_pathc < pglob->gl_offs)
pglob->gl_pathv[pglob->gl_pathc++] = NULL;
#if defined HAVE_STRDUP || defined _LIBC
pglob->gl_pathv[pglob->gl_pathc] = strdup (dirname);
pglob->gl_pathv[newcount] = strdup (dirname);
#else
{
size_t len = strlen (dirname) + 1;
char *dircopy = malloc (len);
if (dircopy != NULL)
pglob->gl_pathv[pglob->gl_pathc] = memcpy (dircopy, dirname,
len);
pglob->gl_pathv[newcount] = memcpy (dircopy, dirname, len);
}
#endif
if (pglob->gl_pathv[pglob->gl_pathc] == NULL)
if (pglob->gl_pathv[newcount] == NULL)
{
free (pglob->gl_pathv);
return GLOB_NOSPACE;
}
pglob->gl_pathv[++pglob->gl_pathc] = NULL;
pglob->gl_pathv[++newcount] = NULL;
++pglob->gl_pathc;
pglob->gl_flags = flags;
return 0;
@ -883,8 +904,7 @@ glob (pattern, flags, errfunc, pglob)
old_pathc = pglob->gl_pathc;
status = glob_in_dir (filename, dirs.gl_pathv[i],
((flags | GLOB_APPEND)
& ~(GLOB_NOCHECK | GLOB_ERR)),
((flags | GLOB_APPEND) & ~GLOB_NOCHECK),
errfunc, pglob);
if (status == GLOB_NOMATCH)
/* No matches in this directory. Try the next. */
@ -899,7 +919,7 @@ glob (pattern, flags, errfunc, pglob)
/* Stick the directory on the front of each name. */
if (prefix_array (dirs.gl_pathv[i],
&pglob->gl_pathv[old_pathc],
&pglob->gl_pathv[old_pathc + pglob->gl_offs],
pglob->gl_pathc - old_pathc))
{
globfree (&dirs);
@ -911,36 +931,33 @@ glob (pattern, flags, errfunc, pglob)
flags |= GLOB_MAGCHAR;
/* We have ignored the GLOB_NOCHECK flag in the `glob_in_dir' calls.
But if we have not found any matching entry and thie GLOB_NOCHECK
But if we have not found any matching entry and the GLOB_NOCHECK
flag was set we must return the list consisting of the disrectory
names followed by the filename. */
if (pglob->gl_pathc == oldcount)
if (pglob->gl_pathc + pglob->gl_offs == oldcount)
{
/* No matches. */
if (flags & GLOB_NOCHECK)
{
size_t filename_len = strlen (filename) + 1;
char **new_pathv;
int newcount = pglob->gl_pathc + pglob->gl_offs;
struct stat st;
#ifdef HAVE_STAT64
struct stat64 st64;
#endif
/* This is an pessimistic guess about the size. */
pglob->gl_pathv
= (char **) realloc (pglob->gl_pathv,
(pglob->gl_pathc +
((flags & GLOB_DOOFFS) ?
pglob->gl_offs : 0) +
dirs.gl_pathc + 1) *
sizeof (char *));
(newcount + dirs.gl_pathc + 1)
* sizeof (char *));
if (pglob->gl_pathv == NULL)
{
globfree (&dirs);
return GLOB_NOSPACE;
}
if (flags & GLOB_DOOFFS)
while (pglob->gl_pathc < pglob->gl_offs)
pglob->gl_pathv[pglob->gl_pathc++] = NULL;
for (i = 0; i < dirs.gl_pathc; ++i)
{
const char *dir = dirs.gl_pathv[i];
@ -948,14 +965,16 @@ glob (pattern, flags, errfunc, pglob)
/* First check whether this really is a directory. */
if (((flags & GLOB_ALTDIRFUNC)
? (*pglob->gl_stat) (dir, &st) : __stat (dir, &st)) != 0
|| !S_ISDIR (st.st_mode))
? ((*pglob->gl_stat) (dir, &st) != 0
|| !S_ISDIR (st.st_mode))
: (__stat64 (dir, &st64) != 0
|| !S_ISDIR (st64.st_mode))))
/* No directory, ignore this entry. */
continue;
pglob->gl_pathv[pglob->gl_pathc] = malloc (dir_len + 1
+ filename_len);
if (pglob->gl_pathv[pglob->gl_pathc] == NULL)
pglob->gl_pathv[newcount] = malloc (dir_len + 1
+ filename_len);
if (pglob->gl_pathv[newcount] == NULL)
{
globfree (&dirs);
globfree (pglob);
@ -963,25 +982,26 @@ glob (pattern, flags, errfunc, pglob)
}
#ifdef HAVE_MEMPCPY
mempcpy (mempcpy (mempcpy (pglob->gl_pathv[pglob->gl_pathc],
mempcpy (mempcpy (mempcpy (pglob->gl_pathv[newcount],
dir, dir_len),
"/", 1),
filename, filename_len);
#else
memcpy (pglob->gl_pathv[pglob->gl_pathc], dir, dir_len);
pglob->gl_pathv[pglob->gl_pathc][dir_len] = '/';
memcpy (&pglob->gl_pathv[pglob->gl_pathc][dir_len + 1],
memcpy (pglob->gl_pathv[newcount], dir, dir_len);
pglob->gl_pathv[newcount][dir_len] = '/';
memcpy (&pglob->gl_pathv[newcount][dir_len + 1],
filename, filename_len);
#endif
++pglob->gl_pathc;
++newcount;
}
pglob->gl_pathv[pglob->gl_pathc] = NULL;
pglob->gl_pathv[newcount] = NULL;
pglob->gl_flags = flags;
/* Now we know how large the gl_pathv vector must be. */
new_pathv = (char **) realloc (pglob->gl_pathv,
((pglob->gl_pathc + 1)
((newcount + 1)
* sizeof (char *)));
if (new_pathv != NULL)
pglob->gl_pathv = new_pathv;
@ -994,6 +1014,8 @@ glob (pattern, flags, errfunc, pglob)
}
else
{
int old_pathc = pglob->gl_pathc;
status = glob_in_dir (filename, dirname, flags, errfunc, pglob);
if (status != 0)
return status;
@ -1001,14 +1023,9 @@ glob (pattern, flags, errfunc, pglob)
if (dirlen > 0)
{
/* Stick the directory on the front of each name. */
int ignore = oldcount;
if ((flags & GLOB_DOOFFS) && ignore < pglob->gl_offs)
ignore = pglob->gl_offs;
if (prefix_array (dirname,
&pglob->gl_pathv[ignore],
pglob->gl_pathc - ignore))
&pglob->gl_pathv[old_pathc + pglob->gl_offs],
pglob->gl_pathc - old_pathc))
{
globfree (pglob);
return GLOB_NOSPACE;
@ -1021,11 +1038,16 @@ glob (pattern, flags, errfunc, pglob)
/* Append slashes to directory names. */
int i;
struct stat st;
for (i = oldcount; i < pglob->gl_pathc; ++i)
#ifdef HAVE_STAT64
struct stat64 st64;
#endif
for (i = oldcount; i < pglob->gl_pathc + pglob->gl_offs; ++i)
if (((flags & GLOB_ALTDIRFUNC)
? (*pglob->gl_stat) (pglob->gl_pathv[i], &st)
: __stat (pglob->gl_pathv[i], &st)) == 0
&& S_ISDIR (st.st_mode))
? ((*pglob->gl_stat) (pglob->gl_pathv[i], &st) == 0
&& S_ISDIR (st.st_mode))
: (__stat64 (pglob->gl_pathv[i], &st64) == 0
&& S_ISDIR (st64.st_mode))))
{
size_t len = strlen (pglob->gl_pathv[i]) + 2;
char *new = realloc (pglob->gl_pathv[i], len);
@ -1042,13 +1064,8 @@ glob (pattern, flags, errfunc, pglob)
if (!(flags & GLOB_NOSORT))
{
/* Sort the vector. */
int non_sort = oldcount;
if ((flags & GLOB_DOOFFS) && pglob->gl_offs > oldcount)
non_sort = pglob->gl_offs;
qsort ((__ptr_t) &pglob->gl_pathv[non_sort],
pglob->gl_pathc - non_sort,
qsort ((__ptr_t) &pglob->gl_pathv[oldcount],
pglob->gl_pathc + pglob->gl_offs - oldcount,
sizeof (char *), collated_compare);
}
@ -1065,8 +1082,8 @@ globfree (pglob)
{
register int i;
for (i = 0; i < pglob->gl_pathc; ++i)
if (pglob->gl_pathv[i] != NULL)
free ((__ptr_t) pglob->gl_pathv[i]);
if (pglob->gl_pathv[pglob->gl_offs + i] != NULL)
free ((__ptr_t) pglob->gl_pathv[pglob->gl_offs + i]);
free ((__ptr_t) pglob->gl_pathv);
}
}
@ -1214,7 +1231,6 @@ glob_in_dir (pattern, directory, flags, errfunc, pglob)
glob_t *pglob;
{
__ptr_t stream = NULL;
struct globlink
{
struct globlink *next;
@ -1226,38 +1242,42 @@ glob_in_dir (pattern, directory, flags, errfunc, pglob)
int save;
meta = __glob_pattern_p (pattern, !(flags & GLOB_NOESCAPE));
if (meta == 0)
if (meta == 0 && (flags & (GLOB_NOCHECK|GLOB_NOMAGIC)))
{
if (flags & (GLOB_NOCHECK|GLOB_NOMAGIC))
/* We need not do any tests. The PATTERN contains no meta
characters and we must not return an error therefore the
result will always contain exactly one name. */
flags |= GLOB_NOCHECK;
else
{
/* Since we use the normal file functions we can also use stat()
to verify the file is there. */
struct stat st;
size_t patlen = strlen (pattern);
size_t dirlen = strlen (directory);
char *fullname = (char *) __alloca (dirlen + 1 + patlen + 1);
/* We need not do any tests. The PATTERN contains no meta
characters and we must not return an error therefore the
result will always contain exactly one name. */
flags |= GLOB_NOCHECK;
nfound = 0;
}
else if (meta == 0 &&
((flags & GLOB_NOESCAPE) || strchr(pattern, '\\') == NULL))
{
/* Since we use the normal file functions we can also use stat()
to verify the file is there. */
struct stat st;
# ifdef HAVE_STAT64
struct stat64 st64;
# endif
size_t patlen = strlen (pattern);
size_t dirlen = strlen (directory);
char *fullname = (char *) __alloca (dirlen + 1 + patlen + 1);
# ifdef HAVE_MEMPCPY
mempcpy (mempcpy (mempcpy (fullname, directory, dirlen),
"/", 1),
pattern, patlen + 1);
mempcpy (mempcpy (mempcpy (fullname, directory, dirlen),
"/", 1),
pattern, patlen + 1);
# else
memcpy (fullname, directory, dirlen);
fullname[dirlen] = '/';
memcpy (&fullname[dirlen + 1], pattern, patlen + 1);
memcpy (fullname, directory, dirlen);
fullname[dirlen] = '/';
memcpy (&fullname[dirlen + 1], pattern, patlen + 1);
# endif
if (((flags & GLOB_ALTDIRFUNC)
? (*pglob->gl_stat) (fullname, &st)
: __stat (fullname, &st)) == 0)
/* We found this file to be existing. Now tell the rest
of the function to copy this name into the result. */
flags |= GLOB_NOCHECK;
}
if (((flags & GLOB_ALTDIRFUNC)
? (*pglob->gl_stat) (fullname, &st)
: __stat64 (fullname, &st64)) == 0)
/* We found this file to be existing. Now tell the rest
of the function to copy this name into the result. */
flags |= GLOB_NOCHECK;
nfound = 0;
}
@ -1368,20 +1388,14 @@ glob_in_dir (pattern, directory, flags, errfunc, pglob)
{
pglob->gl_pathv
= (char **) realloc (pglob->gl_pathv,
(pglob->gl_pathc +
((flags & GLOB_DOOFFS) ? pglob->gl_offs : 0) +
nfound + 1) *
sizeof (char *));
(pglob->gl_pathc + pglob->gl_offs + nfound + 1)
* sizeof (char *));
if (pglob->gl_pathv == NULL)
goto memory_error;
if (flags & GLOB_DOOFFS)
while (pglob->gl_pathc < pglob->gl_offs)
pglob->gl_pathv[pglob->gl_pathc++] = NULL;
for (; names != NULL; names = names->next)
pglob->gl_pathv[pglob->gl_pathc++] = names->name;
pglob->gl_pathv[pglob->gl_pathc] = NULL;
pglob->gl_pathv[pglob->gl_offs + pglob->gl_pathc++] = names->name;
pglob->gl_pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
pglob->gl_flags = flags;
}

16
sysdeps/unix/sysv/linux/i386/sys/debugreg.h
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1998 Free Software Foundation, Inc.
/* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -71,8 +71,18 @@
#define DR_GLOBAL_ENABLE_MASK (0xAA) /* Set global bits for all 4 regs */
/* The second byte to the control register has a few special things.
We can slow the instruction pipeline for instructions coming via the
gdt or the ldt if we want to. I am not sure why this is an advantage */
On the i386, you should set the DR_LOCAL_SLOWDOWN or
DR_GLOBAL_SLOWDOWN bits if you want to know exactly which
instruction triggered the watchpoint. Setting these bits causes
the processor to run more slowly, but leaving them clear makes it
treat watchpoint hits as imprecise exceptions, so you can't
reliably determine which instruction caused the hit.
The i486 and all later IA-32 processors ignore DR_LOCAL_SLOWDOWN
and DR_GLOBAL_SLOWDOWN. They always report the exception
precisely, except in some rare cases, which the user can't do
anything about. */
#define DR_CONTROL_RESERVED (0xFC00) /* Reserved by Intel */
#define DR_LOCAL_SLOWDOWN (0x100) /* Local slow the pipeline */