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glibc/glibc-rh2040657-7.patch
Florian Weimer de9746926c More reliable CPU compatibility diagnostics (#2040657) 
Resolves: #2040657
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2022-01-20 18:44:48 +01:00

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commit b693d75f0c611bce9b0ad984bad306121d42c535
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Jan 14 20:16:05 2022 +0100
elf: Split dl-printf.c from dl-misc.c
This allows to use different compiler flags for the diagnostics
code.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
diff --git a/elf/Makefile b/elf/Makefile
index 124905f96c88ab53..52aafc89cec835ab 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -64,6 +64,7 @@ dl-routines = \
dl-object \
dl-open \
dl-origin \
+ dl-printf \
dl-profile \
dl-reloc \
dl-runtime \
diff --git a/elf/dl-misc.c b/elf/dl-misc.c
index b256d792c6198683..f17140b129343f7b 100644
--- a/elf/dl-misc.c
+++ b/elf/dl-misc.c
@@ -16,24 +16,16 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <assert.h>
+#include <_itoa.h>
#include <fcntl.h>
#include <ldsodefs.h>
-#include <limits.h>
#include <link.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
+#include <not-cancel.h>
#include <stdint.h>
+#include <stdlib.h>
#include <sys/mman.h>
-#include <sys/param.h>
#include <sys/stat.h>
-#include <sys/uio.h>
-#include <sysdep.h>
-#include <_itoa.h>
-#include <dl-writev.h>
-#include <not-cancel.h>
+#include <unistd.h>
/* Read the whole contents of FILE into new mmap'd space with given
protections. *SIZEP gets the size of the file. On error MAP_FAILED
@@ -70,270 +62,6 @@ _dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
return result;
}
-
-/* Bare-bones printf implementation. This function only knows about
- the formats and flags needed and can handle only up to 64 stripes in
- the output. */
-static void
-_dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
-{
-# define NIOVMAX 64
- struct iovec iov[NIOVMAX];
- int niov = 0;
- pid_t pid = 0;
- char pidbuf[12];
-
- while (*fmt != '\0')
- {
- const char *startp = fmt;
-
- if (tag_p > 0)
- {
- /* Generate the tag line once. It consists of the PID and a
- colon followed by a tab. */
- if (pid == 0)
- {
- char *p;
- pid = __getpid ();
- assert (pid >= 0 && sizeof (pid_t) <= 4);
- p = _itoa (pid, &pidbuf[10], 10, 0);
- while (p > pidbuf)
- *--p = ' ';
- pidbuf[10] = ':';
- pidbuf[11] = '\t';
- }
-
- /* Append to the output. */
- assert (niov < NIOVMAX);
- iov[niov].iov_len = 12;
- iov[niov++].iov_base = pidbuf;
-
- /* No more tags until we see the next newline. */
- tag_p = -1;
- }
-
- /* Skip everything except % and \n (if tags are needed). */
- while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
- ++fmt;
-
- /* Append constant string. */
- assert (niov < NIOVMAX);
- if ((iov[niov].iov_len = fmt - startp) != 0)
- iov[niov++].iov_base = (char *) startp;
-
- if (*fmt == '%')
- {
- /* It is a format specifier. */
- char fill = ' ';
- int width = -1;
- int prec = -1;
-#if LONG_MAX != INT_MAX
- int long_mod = 0;
-#endif
-
- /* Recognize zero-digit fill flag. */
- if (*++fmt == '0')
- {
- fill = '0';
- ++fmt;
- }
-
- /* See whether with comes from a parameter. Note that no other
- way to specify the width is implemented. */
- if (*fmt == '*')
- {
- width = va_arg (arg, int);
- ++fmt;
- }
-
- /* Handle precision. */
- if (*fmt == '.' && fmt[1] == '*')
- {
- prec = va_arg (arg, int);
- fmt += 2;
- }
-
- /* Recognize the l modifier. It is only important on some
- platforms where long and int have a different size. We
- can use the same code for size_t. */
- if (*fmt == 'l' || *fmt == 'Z')
- {
-#if LONG_MAX != INT_MAX
- long_mod = 1;
-#endif
- ++fmt;
- }
-
- switch (*fmt)
- {
- /* Integer formatting. */
- case 'd':
- case 'u':
- case 'x':
- {
- /* We have to make a difference if long and int have a
- different size. */
-#if LONG_MAX != INT_MAX
- unsigned long int num = (long_mod
- ? va_arg (arg, unsigned long int)
- : va_arg (arg, unsigned int));
-#else
- unsigned long int num = va_arg (arg, unsigned int);
-#endif
- bool negative = false;
- if (*fmt == 'd')
- {
-#if LONG_MAX != INT_MAX
- if (long_mod)
- {
- if ((long int) num < 0)
- negative = true;
- }
- else
- {
- if ((int) num < 0)
- {
- num = (unsigned int) num;
- negative = true;
- }
- }
-#else
- if ((int) num < 0)
- negative = true;
-#endif
- }
-
- /* We use alloca() to allocate the buffer with the most
- pessimistic guess for the size. Using alloca() allows
- having more than one integer formatting in a call. */
- char *buf = (char *) alloca (1 + 3 * sizeof (unsigned long int));
- char *endp = &buf[1 + 3 * sizeof (unsigned long int)];
- char *cp = _itoa (num, endp, *fmt == 'x' ? 16 : 10, 0);
-
- /* Pad to the width the user specified. */
- if (width != -1)
- while (endp - cp < width)
- *--cp = fill;
-
- if (negative)
- *--cp = '-';
-
- iov[niov].iov_base = cp;
- iov[niov].iov_len = endp - cp;
- ++niov;
- }
- break;
-
- case 's':
- /* Get the string argument. */
- iov[niov].iov_base = va_arg (arg, char *);
- iov[niov].iov_len = strlen (iov[niov].iov_base);
- if (prec != -1)
- iov[niov].iov_len = MIN ((size_t) prec, iov[niov].iov_len);
- ++niov;
- break;
-
- case '%':
- iov[niov].iov_base = (void *) fmt;
- iov[niov].iov_len = 1;
- ++niov;
- break;
-
- default:
- assert (! "invalid format specifier");
- }
- ++fmt;
- }
- else if (*fmt == '\n')
- {
- /* See whether we have to print a single newline character. */
- if (fmt == startp)
- {
- iov[niov].iov_base = (char *) startp;
- iov[niov++].iov_len = 1;
- }
- else
- /* No, just add it to the rest of the string. */
- ++iov[niov - 1].iov_len;
-
- /* Next line, print a tag again. */
- tag_p = 1;
- ++fmt;
- }
- }
-
- /* Finally write the result. */
- _dl_writev (fd, iov, niov);
-}
-
-
-/* Write to debug file. */
-void
-_dl_debug_printf (const char *fmt, ...)
-{
- va_list arg;
-
- va_start (arg, fmt);
- _dl_debug_vdprintf (GLRO(dl_debug_fd), 1, fmt, arg);
- va_end (arg);
-}
-
-
-/* Write to debug file but don't start with a tag. */
-void
-_dl_debug_printf_c (const char *fmt, ...)
-{
- va_list arg;
-
- va_start (arg, fmt);
- _dl_debug_vdprintf (GLRO(dl_debug_fd), -1, fmt, arg);
- va_end (arg);
-}
-
-
-/* Write the given file descriptor. */
-void
-_dl_dprintf (int fd, const char *fmt, ...)
-{
- va_list arg;
-
- va_start (arg, fmt);
- _dl_debug_vdprintf (fd, 0, fmt, arg);
- va_end (arg);
-}
-
-void
-_dl_printf (const char *fmt, ...)
-{
- va_list arg;
-
- va_start (arg, fmt);
- _dl_debug_vdprintf (STDOUT_FILENO, 0, fmt, arg);
- va_end (arg);
-}
-
-void
-_dl_error_printf (const char *fmt, ...)
-{
- va_list arg;
-
- va_start (arg, fmt);
- _dl_debug_vdprintf (STDERR_FILENO, 0, fmt, arg);
- va_end (arg);
-}
-
-void
-_dl_fatal_printf (const char *fmt, ...)
-{
- va_list arg;
-
- va_start (arg, fmt);
- _dl_debug_vdprintf (STDERR_FILENO, 0, fmt, arg);
- va_end (arg);
- _exit (127);
-}
-rtld_hidden_def (_dl_fatal_printf)
-
/* Test whether given NAME matches any of the names of the given object. */
int
_dl_name_match_p (const char *name, const struct link_map *map)
@@ -354,7 +82,6 @@ _dl_name_match_p (const char *name, const struct link_map *map)
return 0;
}
-
unsigned long int
_dl_higher_prime_number (unsigned long int n)
{
diff --git a/elf/dl-printf.c b/elf/dl-printf.c
new file mode 100644
index 0000000000000000..d3264ba96cd959bf
--- /dev/null
+++ b/elf/dl-printf.c
@@ -0,0 +1,292 @@
+/* printf implementation for the dynamic loader.
+ Copyright (C) 1997-2022 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
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <_itoa.h>
+#include <assert.h>
+#include <dl-writev.h>
+#include <ldsodefs.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/uio.h>
+#include <unistd.h>
+
+/* Bare-bones printf implementation. This function only knows about
+ the formats and flags needed and can handle only up to 64 stripes in
+ the output. */
+static void
+_dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
+{
+# define NIOVMAX 64
+ struct iovec iov[NIOVMAX];
+ int niov = 0;
+ pid_t pid = 0;
+ char pidbuf[12];
+
+ while (*fmt != '\0')
+ {
+ const char *startp = fmt;
+
+ if (tag_p > 0)
+ {
+ /* Generate the tag line once. It consists of the PID and a
+ colon followed by a tab. */
+ if (pid == 0)
+ {
+ char *p;
+ pid = __getpid ();
+ assert (pid >= 0 && sizeof (pid_t) <= 4);
+ p = _itoa (pid, &pidbuf[10], 10, 0);
+ while (p > pidbuf)
+ *--p = ' ';
+ pidbuf[10] = ':';
+ pidbuf[11] = '\t';
+ }
+
+ /* Append to the output. */
+ assert (niov < NIOVMAX);
+ iov[niov].iov_len = 12;
+ iov[niov++].iov_base = pidbuf;
+
+ /* No more tags until we see the next newline. */
+ tag_p = -1;
+ }
+
+ /* Skip everything except % and \n (if tags are needed). */
+ while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
+ ++fmt;
+
+ /* Append constant string. */
+ assert (niov < NIOVMAX);
+ if ((iov[niov].iov_len = fmt - startp) != 0)
+ iov[niov++].iov_base = (char *) startp;
+
+ if (*fmt == '%')
+ {
+ /* It is a format specifier. */
+ char fill = ' ';
+ int width = -1;
+ int prec = -1;
+#if LONG_MAX != INT_MAX
+ int long_mod = 0;
+#endif
+
+ /* Recognize zero-digit fill flag. */
+ if (*++fmt == '0')
+ {
+ fill = '0';
+ ++fmt;
+ }
+
+ /* See whether with comes from a parameter. Note that no other
+ way to specify the width is implemented. */
+ if (*fmt == '*')
+ {
+ width = va_arg (arg, int);
+ ++fmt;
+ }
+
+ /* Handle precision. */
+ if (*fmt == '.' && fmt[1] == '*')
+ {
+ prec = va_arg (arg, int);
+ fmt += 2;
+ }
+
+ /* Recognize the l modifier. It is only important on some
+ platforms where long and int have a different size. We
+ can use the same code for size_t. */
+ if (*fmt == 'l' || *fmt == 'Z')
+ {
+#if LONG_MAX != INT_MAX
+ long_mod = 1;
+#endif
+ ++fmt;
+ }
+
+ switch (*fmt)
+ {
+ /* Integer formatting. */
+ case 'd':
+ case 'u':
+ case 'x':
+ {
+ /* We have to make a difference if long and int have a
+ different size. */
+#if LONG_MAX != INT_MAX
+ unsigned long int num = (long_mod
+ ? va_arg (arg, unsigned long int)
+ : va_arg (arg, unsigned int));
+#else
+ unsigned long int num = va_arg (arg, unsigned int);
+#endif
+ bool negative = false;
+ if (*fmt == 'd')
+ {
+#if LONG_MAX != INT_MAX
+ if (long_mod)
+ {
+ if ((long int) num < 0)
+ negative = true;
+ }
+ else
+ {
+ if ((int) num < 0)
+ {
+ num = (unsigned int) num;
+ negative = true;
+ }
+ }
+#else
+ if ((int) num < 0)
+ negative = true;
+#endif
+ }
+
+ /* We use alloca() to allocate the buffer with the most
+ pessimistic guess for the size. Using alloca() allows
+ having more than one integer formatting in a call. */
+ char *buf = (char *) alloca (1 + 3 * sizeof (unsigned long int));
+ char *endp = &buf[1 + 3 * sizeof (unsigned long int)];
+ char *cp = _itoa (num, endp, *fmt == 'x' ? 16 : 10, 0);
+
+ /* Pad to the width the user specified. */
+ if (width != -1)
+ while (endp - cp < width)
+ *--cp = fill;
+
+ if (negative)
+ *--cp = '-';
+
+ iov[niov].iov_base = cp;
+ iov[niov].iov_len = endp - cp;
+ ++niov;
+ }
+ break;
+
+ case 's':
+ /* Get the string argument. */
+ iov[niov].iov_base = va_arg (arg, char *);
+ iov[niov].iov_len = strlen (iov[niov].iov_base);
+ if (prec != -1)
+ iov[niov].iov_len = MIN ((size_t) prec, iov[niov].iov_len);
+ ++niov;
+ break;
+
+ case '%':
+ iov[niov].iov_base = (void *) fmt;
+ iov[niov].iov_len = 1;
+ ++niov;
+ break;
+
+ default:
+ assert (! "invalid format specifier");
+ }
+ ++fmt;
+ }
+ else if (*fmt == '\n')
+ {
+ /* See whether we have to print a single newline character. */
+ if (fmt == startp)
+ {
+ iov[niov].iov_base = (char *) startp;
+ iov[niov++].iov_len = 1;
+ }
+ else
+ /* No, just add it to the rest of the string. */
+ ++iov[niov - 1].iov_len;
+
+ /* Next line, print a tag again. */
+ tag_p = 1;
+ ++fmt;
+ }
+ }
+
+ /* Finally write the result. */
+ _dl_writev (fd, iov, niov);
+}
+
+
+/* Write to debug file. */
+void
+_dl_debug_printf (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (GLRO(dl_debug_fd), 1, fmt, arg);
+ va_end (arg);
+}
+
+
+/* Write to debug file but don't start with a tag. */
+void
+_dl_debug_printf_c (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (GLRO(dl_debug_fd), -1, fmt, arg);
+ va_end (arg);
+}
+
+
+/* Write the given file descriptor. */
+void
+_dl_dprintf (int fd, const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (fd, 0, fmt, arg);
+ va_end (arg);
+}
+
+void
+_dl_printf (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (STDOUT_FILENO, 0, fmt, arg);
+ va_end (arg);
+}
+
+void
+_dl_error_printf (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (STDERR_FILENO, 0, fmt, arg);
+ va_end (arg);
+}
+
+void
+_dl_fatal_printf (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (STDERR_FILENO, 0, fmt, arg);
+ va_end (arg);
+ _exit (127);
+}
+rtld_hidden_def (_dl_fatal_printf)
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