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, 263 deletions

diff --git a/sysdeps/unix/sysv/linux/sh/register-dump.h b/sysdeps/unix/sysv/linux/sh/register-dump.h
deleted file mode 100644
index b37faa707d..0000000000
--- a/sysdeps/unix/sysv/linux/sh/register-dump.h
+++ /dev/null
@@ -1,263 +0,0 @@
-/* Dump registers.
-   Copyright (C) 1999-2022 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>
-
-/* 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  R10: XXXXXXXX  R11: XXXXXXXX
- R12: XXXXXXXX  R13: XXXXXXXX  R14: XXXXXXXX  R15: XXXXXXXX
-
-MACL: XXXXXXXX MACH: XXXXXXXX
-
-  PC: XXXXXXXX   PR: XXXXXXXX  GBR: XXXXXXXX   SR: XXXXXXXX
-
- FR0: XXXXXXXX  FR1: XXXXXXXX  FR2: XXXXXXXX  FR3: XXXXXXXX
- FR4: XXXXXXXX  FR5: XXXXXXXX  FR6: XXXXXXXX  FR7: XXXXXXXX
- FR8: XXXXXXXX  FR9: XXXXXXXX FR10: XXXXXXXX FR11: XXXXXXXX
-FR12: XXXXXXXX FR13: XXXXXXXX FR14: XXXXXXXX FR15: XXXXXXXX
-
- XR0: XXXXXXXX  XR1: XXXXXXXX  XR2: XXXXXXXX  XR3: XXXXXXXX
- XR4: XXXXXXXX  XR5: XXXXXXXX  XR6: XXXXXXXX  XR7: XXXXXXXX
- XR8: XXXXXXXX  XR9: XXXXXXXX XR10: XXXXXXXX XR11: XXXXXXXX
-XR12: XXXXXXXX XR13: XXXXXXXX XR14: XXXXXXXX XR15: XXXXXXXX
-
-FPSCR: XXXXXXXX FPUL: 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, struct ucontext_t *ctx)
-{
-  char regs[22][8];
-  struct iovec iov[22 * 2 + 34 * 2 + 2];
-  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[REG_R0], regs[0], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R1], regs[1], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R2], regs[2], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R3], regs[3], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R4], regs[4], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R5], regs[5], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R6], regs[6], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R7], regs[7], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R8], regs[8], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R9], regs[9], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R10], regs[10], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R11], regs[11], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R12], regs[12], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R13], regs[13], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R14], regs[14], 8);
-  hexvalue (ctx->uc_mcontext.gregs[REG_R15], regs[15], 8);
-  hexvalue (ctx->uc_mcontext.macl, regs[16], 8);
-  hexvalue (ctx->uc_mcontext.mach, regs[17], 8);
-  hexvalue (ctx->uc_mcontext.pc, regs[18], 8);
-  hexvalue (ctx->uc_mcontext.pr, regs[19], 8);
-  hexvalue (ctx->uc_mcontext.gbr, regs[20], 8);
-  hexvalue (ctx->uc_mcontext.sr, regs[21], 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 ("  R10: ");
-  ADD_MEM (regs[10], 8);
-  ADD_STRING ("  R11: ");
-  ADD_MEM (regs[11], 8);
-  ADD_STRING ("\n R12: ");
-  ADD_MEM (regs[12], 8);
-  ADD_STRING ("  R13: ");
-  ADD_MEM (regs[13], 8);
-  ADD_STRING ("  R14: ");
-  ADD_MEM (regs[14], 8);
-  ADD_STRING ("  R15: ");
-  ADD_MEM (regs[15], 8);
-
-  ADD_STRING ("\n\nMACL: ");
-  ADD_MEM (regs[16], 8);
-  ADD_STRING (" MACH: ");
-  ADD_MEM (regs[17], 8);
-
-  ADD_STRING ("\n\n  PC: ");
-  ADD_MEM (regs[18], 8);
-  ADD_STRING ("   PR: ");
-  ADD_MEM (regs[19], 8);
-  ADD_STRING ("  GBR: ");
-  ADD_MEM (regs[20], 8);
-  ADD_STRING ("   SR: ");
-  ADD_MEM (regs[21], 8);
-
-  ADD_STRING ("\n");
-
-#ifdef __SH_FPU_ANY__
-  char fpregs[34][8];
-  if (ctx->uc_mcontext.ownedfp != 0)
-    {
-      hexvalue (ctx->uc_mcontext.fpregs[0], fpregs[0], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[1], fpregs[1], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[2], fpregs[2], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[3], fpregs[3], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[4], fpregs[4], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[5], fpregs[5], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[6], fpregs[6], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[7], fpregs[7], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[8], fpregs[8], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[9], fpregs[9], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[10], fpregs[10], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[11], fpregs[11], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[12], fpregs[12], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[13], fpregs[13], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[14], fpregs[14], 8);
-      hexvalue (ctx->uc_mcontext.fpregs[15], fpregs[15], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[0], fpregs[16], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[1], fpregs[17], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[2], fpregs[18], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[3], fpregs[19], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[4], fpregs[20], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[5], fpregs[21], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[6], fpregs[22], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[7], fpregs[23], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[8], fpregs[24], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[9], fpregs[25], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[10], fpregs[26], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[11], fpregs[27], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[12], fpregs[28], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[13], fpregs[29], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[14], fpregs[30], 8);
-      hexvalue (ctx->uc_mcontext.xfpregs[15], fpregs[31], 8);
-      hexvalue (ctx->uc_mcontext.fpscr, fpregs[32], 8);
-      hexvalue (ctx->uc_mcontext.fpul, fpregs[33], 8);
-
-      ADD_STRING ("\n\n FR0: ");
-      ADD_MEM (fpregs[0], 8);
-      ADD_STRING ("  FR1: ");
-      ADD_MEM (fpregs[1], 8);
-      ADD_STRING ("  FR2: ");
-      ADD_MEM (fpregs[2], 8);
-      ADD_STRING ("  FR3: ");
-      ADD_MEM (fpregs[3], 8);
-      ADD_STRING ("\n FR4: ");
-      ADD_MEM (fpregs[4], 8);
-      ADD_STRING ("  FR5: ");
-      ADD_MEM (fpregs[5], 8);
-      ADD_STRING ("  FR6: ");
-      ADD_MEM (fpregs[6], 8);
-      ADD_STRING ("  FR7: ");
-      ADD_MEM (fpregs[7], 8);
-      ADD_STRING ("\n FR8: ");
-      ADD_MEM (fpregs[8], 8);
-      ADD_STRING ("  FR9: ");
-      ADD_MEM (fpregs[9], 8);
-      ADD_STRING (" FR10: ");
-      ADD_MEM (fpregs[10], 8);
-      ADD_STRING (" FR11: ");
-      ADD_MEM (fpregs[11], 8);
-      ADD_STRING ("\nFR12: ");
-      ADD_MEM (fpregs[12], 8);
-      ADD_STRING (" FR13: ");
-      ADD_MEM (fpregs[13], 8);
-      ADD_STRING (" FR14: ");
-      ADD_MEM (fpregs[14], 8);
-      ADD_STRING (" FR15: ");
-      ADD_MEM (fpregs[15], 8);
-      ADD_STRING ("\n\n XR0: ");
-      ADD_MEM (fpregs[16], 8);
-      ADD_STRING ("  XR1: ");
-      ADD_MEM (fpregs[17], 8);
-      ADD_STRING ("  XR2: ");
-      ADD_MEM (fpregs[18], 8);
-      ADD_STRING ("  XR3: ");
-      ADD_MEM (fpregs[19], 8);
-      ADD_STRING ("\n XR4: ");
-      ADD_MEM (fpregs[20], 8);
-      ADD_STRING ("  XR5: ");
-      ADD_MEM (fpregs[21], 8);
-      ADD_STRING ("  XR6: ");
-      ADD_MEM (fpregs[22], 8);
-      ADD_STRING ("  XR7: ");
-      ADD_MEM (fpregs[23], 8);
-      ADD_STRING ("\n XR8: ");
-      ADD_MEM (fpregs[24], 8);
-      ADD_STRING ("  XR9: ");
-      ADD_MEM (fpregs[25], 8);
-      ADD_STRING (" XR10: ");
-      ADD_MEM (fpregs[26], 8);
-      ADD_STRING (" XR11: ");
-      ADD_MEM (fpregs[27], 8);
-      ADD_STRING ("\nXR12: ");
-      ADD_MEM (fpregs[28], 8);
-      ADD_STRING (" XR13: ");
-      ADD_MEM (fpregs[29], 8);
-      ADD_STRING (" XR14: ");
-      ADD_MEM (fpregs[30], 8);
-      ADD_STRING (" XR15: ");
-      ADD_MEM (fpregs[31], 8);
-
-      ADD_STRING ("\n\nFPSCR: ");
-      ADD_MEM (fpregs[32], 8);
-      ADD_STRING (" FPUL: ");
-      ADD_MEM (fpregs[33], 8);
-
-      ADD_STRING ("\n");
-    }
-#endif /* __SH_FPU_ANY__  */
-
-  /* Write the stuff out.  */
-  writev (fd, iov, nr);
-}
-
-
-#define REGISTER_DUMP register_dump (fd, ctx)