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, 135 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/register-dump.h b/sysdeps/unix/sysv/linux/arm/register-dump.h
deleted file mode 100644
index 1cbdbe38e1..0000000000
--- a/sysdeps/unix/sysv/linux/arm/register-dump.h
+++ /dev/null
@@ -1,135 +0,0 @@
-/* Dump registers.
-   Copyright (C) 1998-2022 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 <sys/ucontext.h>
-
-/* We will print the register dump in this format:
-
- R0: XXXXXXXX   R1: XXXXXXXX   R2: XXXXXXXX   R3: XXXXXXXX
- R4: XXXXXXXX   R5: XXXXXXXX   R6: XXXXXXXX   R7: XXXXXXXX
- R8: XXXXXXXX   R9: XXXXXXXX   SL: XXXXXXXX   FP: XXXXXXXX
- IP: XXXXXXXX   SP: XXXXXXXX   LR: XXXXXXXX   PC: XXXXXXXX
-
- CPSR: XXXXXXXX
-
- Trap: XXXXXXXX   Error: XXXXXXXX   OldMask: XXXXXXXX
- Addr: 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 ucontext_t *ctx)
-{
-  char regs[21][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.arm_r0, regs[0], 8);
-  hexvalue (ctx->uc_mcontext.arm_r1, regs[1], 8);
-  hexvalue (ctx->uc_mcontext.arm_r2, regs[2], 8);
-  hexvalue (ctx->uc_mcontext.arm_r3, regs[3], 8);
-  hexvalue (ctx->uc_mcontext.arm_r4, regs[4], 8);
-  hexvalue (ctx->uc_mcontext.arm_r5, regs[5], 8);
-  hexvalue (ctx->uc_mcontext.arm_r6, regs[6], 8);
-  hexvalue (ctx->uc_mcontext.arm_r7, regs[7], 8);
-  hexvalue (ctx->uc_mcontext.arm_r8, regs[8], 8);
-  hexvalue (ctx->uc_mcontext.arm_r9, regs[9], 8);
-  hexvalue (ctx->uc_mcontext.arm_r10, regs[10], 8);
-  hexvalue (ctx->uc_mcontext.arm_fp, regs[11], 8);
-  hexvalue (ctx->uc_mcontext.arm_ip, regs[12], 8);
-  hexvalue (ctx->uc_mcontext.arm_sp, regs[13], 8);
-  hexvalue (ctx->uc_mcontext.arm_lr, regs[14], 8);
-  hexvalue (ctx->uc_mcontext.arm_pc, regs[15], 8);
-  hexvalue (ctx->uc_mcontext.arm_cpsr, regs[16], 8);
-  hexvalue (ctx->uc_mcontext.trap_no, regs[17], 8);
-  hexvalue (ctx->uc_mcontext.error_code, regs[18], 8);
-  hexvalue (ctx->uc_mcontext.oldmask, regs[19], 8);
-  hexvalue (ctx->uc_mcontext.fault_address, regs[20], 8);
-
-  /* Generate the output.  */
-  ADD_STRING ("Register dump:\n\n R0: ");
-  ADD_MEM (regs[0], 8);
-  ADD_STRING ("   R1: ");
-  ADD_MEM (regs[1], 8);
-  ADD_STRING ("   R2: ");
-  ADD_MEM (regs[2], 8);
-  ADD_STRING ("   R3: ");
-  ADD_MEM (regs[3], 8);
-  ADD_STRING ("\n R4: ");
-  ADD_MEM (regs[4], 8);
-  ADD_STRING ("   R5: ");
-  ADD_MEM (regs[5], 8);
-  ADD_STRING ("   R6: ");
-  ADD_MEM (regs[6], 8);
-  ADD_STRING ("   R7: ");
-  ADD_MEM (regs[7], 8);
-  ADD_STRING ("\n R8: ");
-  ADD_MEM (regs[8], 8);
-  ADD_STRING ("   R9: ");
-  ADD_MEM (regs[9], 8);
-  ADD_STRING ("   SL: ");
-  ADD_MEM (regs[10], 8);
-  ADD_STRING ("   FP: ");
-  ADD_MEM (regs[11], 8);
-  ADD_STRING ("\n IP: ");
-  ADD_MEM (regs[12], 8);
-  ADD_STRING ("   SP: ");
-  ADD_MEM (regs[13], 8);
-  ADD_STRING ("   LR: ");
-  ADD_MEM (regs[14], 8);
-  ADD_STRING ("   PC: ");
-  ADD_MEM (regs[15], 8);
-  ADD_STRING ("\n\n CPSR: ");
-  ADD_MEM (regs[16], 8);
-  ADD_STRING ("\n\n Trap: ");
-  ADD_MEM (regs[17], 8);
-  ADD_STRING ("   Error: ");
-  ADD_MEM (regs[18], 8);
-  ADD_STRING ("   OldMask: ");
-  ADD_MEM (regs[19], 8);
-  ADD_STRING ("\n Addr: ");
-  ADD_MEM (regs[20], 8);
-
-  ADD_STRING ("\n");
-
-  /* Write the stuff out.  */
-  writev (fd, iov, nr);
-}
-
-
-#define REGISTER_DUMP register_dump (fd, ctx)