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, 190 deletions

diff --git a/sysdeps/unix/sysv/linux/csky/register-dump.h b/sysdeps/unix/sysv/linux/csky/register-dump.h
deleted file mode 100644
index f313a6979a..0000000000
--- a/sysdeps/unix/sysv/linux/csky/register-dump.h
+++ /dev/null
@@ -1,190 +0,0 @@
-/* Dump registers.
-   Copyright (C) 2018-2022 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 <sys/uio.h>
-#include <_itoa.h>
-#include <bits/sigcontext.h>
-#include <sys/ucontext.h>
-
-/* abiv1 register dump in this format:
-
- PSR: XXXXXXXX  PC: XXXXXXXX   SP: XXXXXXXX   LR: XXXXXXXX
- MASK: XXXXXXXX
-
- A0: XXXXXXXX   A1: XXXXXXXX   A2: XXXXXXXX   A3: XXXXXXXX
- R6: XXXXXXXX   R7: XXXXXXXX   R8: XXXXXXXX   R9: XXXXXXXX
- R10: XXXXXXXX  R11: XXXXXXXX  R12: XXXXXXXX  R13: XXXXXXXX
- R14: XXXXXXXX  R1: XXXXXXXX
-
- abiv2 register dump in this format:
-
- PSR: XXXXXXXX  PC: XXXXXXXX   SP: XXXXXXXX   LR: XXXXXXXX
- MASK: XXXXXXXX
-
- A0: XXXXXXXX   A1: XXXXXXXX   A2: XXXXXXXX   A3: XXXXXXXX
- R4: XXXXXXXX   R5: XXXXXXXX   R6: XXXXXXXX   R7: XXXXXXXX
- R8: XXXXXXXX   R9: XXXXXXXX   R10: XXXXXXXX  R11: XXXXXXXX
- R12: XXXXXXXX  R13: XXXXXXXX  R14: XXXXXXXX  R15: XXXXXXXX
- R16: XXXXXXXX  R17: XXXXXXXX  R18: XXXXXXXX  R19: XXXXXXXX
- R20: XXXXXXXX  R21: XXXXXXXX  R22: XXXXXXXX  R23: XXXXXXXX
- R24: XXXXXXXX  R25: XXXXXXXX  R26: XXXXXXXX  R27: XXXXXXXX
- R28: XXXXXXXX  R29: XXXXXXXX  R30: XXXXXXXX  R31: XXXXXXXX
-
- */
-
-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';
-}
-
-static void
-register_dump (int fd, const struct ucontext_t *ctx)
-{
-  char regs[35][8];
-  struct iovec iov[97];
-  size_t nr = 0;
-
-#define ADD_STRING(str) \
-  iov[nr].iov_base = (char *) str;					      \
-  iov[nr].iov_len = strlen (str);					      \
-  ++nr
-#define ADD_MEM(str, len) \
-  iov[nr].iov_base = str;						      \
-  iov[nr].iov_len = len;						      \
-  ++nr
-
-  /* Generate strings of register contents.  */
-  hexvalue (ctx->uc_mcontext.__gregs.__sr, regs[0], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__pc, regs[1], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__usp, regs[2], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__lr, regs[3], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__a0, regs[4], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__a1, regs[5], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__a2, regs[6], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__a3, regs[7], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[0], regs[8], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[1], regs[9], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[2], regs[10], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[3], regs[11], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[4], regs[12], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[5], regs[13], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[6], regs[14], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[7], regs[15], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[8], regs[16], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__regs[9], regs[17], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[0], regs[18], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[1], regs[19], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[2], regs[20], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[3], regs[21], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[4], regs[22], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[5], regs[23], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[6], regs[24], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[7], regs[25], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[8], regs[26], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[9], regs[27], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[10], regs[28], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[11], regs[29], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[12], regs[30], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[13], regs[31], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__exregs[14], regs[32], 8);
-  hexvalue (ctx->uc_mcontext.__gregs.__tls, regs[33], 8);
-
-  /* Generate the output.  */
-  ADD_STRING ("Register dump:\n\n PSR: ");
-  ADD_MEM (regs[0], 8);
-  ADD_STRING ("  PC: ");
-  ADD_MEM (regs[1], 8);
-  ADD_STRING ("   SP: ");
-  ADD_MEM (regs[2], 8);
-  ADD_STRING ("   LR: ");
-  ADD_MEM (regs[3], 8);
-  ADD_STRING ("\n\n A0: ");
-  ADD_MEM (regs[4], 8);
-  ADD_STRING ("   A1: ");
-  ADD_MEM (regs[5], 8);
-  ADD_STRING ("   A2: ");
-  ADD_MEM (regs[6], 8);
-  ADD_STRING ("   A3: ");
-  ADD_MEM (regs[7], 8);
-  ADD_STRING ("\n R4: ");
-  ADD_MEM (regs[8], 8);
-  ADD_STRING ("   R5: ");
-  ADD_MEM (regs[9], 8);
-  ADD_STRING ("   R6: ");
-  ADD_MEM (regs[10], 8);
-  ADD_STRING ("   R7: ");
-  ADD_MEM (regs[11], 8);
-  ADD_STRING ("\n R8: ");
-  ADD_MEM (regs[12], 8);
-  ADD_STRING ("   R9: ");
-  ADD_MEM (regs[13], 8);
-  ADD_STRING ("   R10: ");
-  ADD_MEM (regs[14], 8);
-  ADD_STRING ("  R11: ");
-  ADD_MEM (regs[15], 8);
-  ADD_STRING ("\n R12: ");
-  ADD_MEM (regs[16], 8);
-  ADD_STRING ("  R13: ");
-  ADD_MEM (regs[17], 8);
-  ADD_STRING ("  R14: ");
-  ADD_MEM (regs[2], 8);
-  ADD_STRING ("  R15: ");
-  ADD_MEM (regs[3], 8);
-  ADD_STRING ("\n R16: ");
-  ADD_MEM (regs[18], 8);
-  ADD_STRING ("  R17: ");
-  ADD_MEM (regs[19], 8);
-  ADD_STRING ("  R18: ");
-  ADD_MEM (regs[20], 8);
-  ADD_STRING ("  R19: ");
-  ADD_MEM (regs[21], 8);
-  ADD_STRING ("\n R20: ");
-  ADD_MEM (regs[22], 8);
-  ADD_STRING ("  R21: ");
-  ADD_MEM (regs[23], 8);
-  ADD_STRING ("  R22: ");
-  ADD_MEM (regs[24], 8);
-  ADD_STRING ("  R23: ");
-  ADD_MEM (regs[25], 8);
-  ADD_STRING ("\n R24: ");
-  ADD_MEM (regs[26], 8);
-  ADD_STRING ("  R25: ");
-  ADD_MEM (regs[27], 8);
-  ADD_STRING ("  R26: ");
-  ADD_MEM (regs[28], 8);
-  ADD_STRING ("  R27: ");
-  ADD_MEM (regs[29], 8);
-  ADD_STRING ("\n R28: ");
-  ADD_MEM (regs[30], 8);
-  ADD_STRING ("  R29: ");
-  ADD_MEM (regs[31], 8);
-  ADD_STRING ("  R30: ");
-  ADD_MEM (regs[32], 8);
-  ADD_STRING ("  R31: ");
-  ADD_MEM (regs[33], 8);
-
-  ADD_STRING ("\n");
-
-  /* Write the stuff out.  */
-  writev (fd, iov, nr);
-}
-
-#define REGISTER_DUMP register_dump (fd, ctx)