debug: Remove catchsegv and libSegfault (BZ #14913)

Trapping SIGSEGV within the process is error-prone, adds security
issues, and modern analysis design tends to happen out of the
process (either by attaching a debugger or by post-mortem analysis).

The libSegfault also has some design problems, it uses non
async-signal-safe function (backtrace) on signal handler.

There are multiple alternatives if users do want to use similar
functionality, such as sigsegv gnulib module or libsegfault.

1 files changed, 0 insertions, 63 deletions

diff --git a/sysdeps/unix/sysv/linux/riscv/register-dump.h b/sysdeps/unix/sysv/linux/riscv/register-dump.h
deleted file mode 100644
index 177636f18f..0000000000
--- a/sysdeps/unix/sysv/linux/riscv/register-dump.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/* Dump registers.
-   Copyright (C) 2000-2022 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 <unistd.h>
-#include <string.h>
-#include <_itoa.h>
-
-static void
-hexvalue (unsigned long int value, char *buf, size_t len)
-{
-  char *cp = _itoa_word (value, buf + len, 16, 0);
-  while (cp > buf)
-    *--cp = '0';
-}
-
-#define REGDUMP_NREGS 32
-#define REGDUMP_PER_LINE (80 / (__WORDSIZE / 4 + 4))
-
-static void
-register_dump (int fd, ucontext_t *ctx)
-{
-  int i;
-  char regvalue[__WORDSIZE / 4 + 1];
-  char str[82 * ((REGDUMP_NREGS + REGDUMP_PER_LINE - 1) / REGDUMP_PER_LINE)];
-
-  static const char names[REGDUMP_NREGS][4] = {
-    "pc", "ra", "sp", "gp", "tp", "t0", "t1", "t2",
-    "s0", "s1", "a0", "a1", "a2", "a3", "a4", "a5",
-    "a6", "a7", "s2", "s3", "s4", "s5", "s6", "s7",
-    "s8", "s9", "sA", "sB", "t3", "t4", "t5", "t6"
-  };
-
-  str[0] = 0;
-  for (i = 0; i < REGDUMP_NREGS; i++)
-    {
-      strcat (str, names[i]);
-      strcat (str, " ");
-      hexvalue (ctx->uc_mcontext.__gregs[i], regvalue, __WORDSIZE / 4);
-      strcat (str, regvalue);
-
-      if ((i + 1) % REGDUMP_PER_LINE == 0)
-	strcat (str, "\n");
-    }
-
-  write (fd, str, strlen (str));
-}
-
-#define REGISTER_DUMP register_dump (fd, ctx)