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, 124 deletions

diff --git a/sysdeps/powerpc/powerpc64/register-dump.h b/sysdeps/powerpc/powerpc64/register-dump.h
deleted file mode 100644
index 73454e5d34..0000000000
--- a/sysdeps/powerpc/powerpc64/register-dump.h
+++ /dev/null
@@ -1,124 +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>
-
-/* This prints out the information in the following form: */
-static const char dumpform[] = "\
-Register dump:\n\
-sr0=000000000000020% sr1=000000000000021% dar=000000000000029% dsi=000002a%\n\
-lr=000000000000024%  ctr=000000000000023% gr3*=000000000000022% trap=0000028%\n\
-ccr=0000026%  xer=0000025%\n\
-gr0-3:   000000000000000% 000000000000001% 000000000000002% 000000000000003%\n\
-gr4-7:   000000000000004% 000000000000005% 000000000000006% 000000000000007%\n\
-gr8-11:  000000000000008% 000000000000009% 00000000000000a% 00000000000000b%\n\
-gr12-15: 00000000000000c% 00000000000000d% 00000000000000e% 00000000000000f%\n\
-gr16-19: 000000000000010% 000000000000011% 000000000000012% 000000000000013%\n\
-gr20-23: 000000000000014% 000000000000015% 000000000000016% 000000000000017%\n\
-gr24-27: 000000000000018% 000000000000019% 00000000000001a% 00000000000001b%\n\
-gr28-31: 00000000000001c% 00000000000001d% 00000000000001e% 00000000000001f%\n\
-fscr=000000000000050%\n\
-fp0-3:   000000000000030% 000000000000031% 000000000000032% 000000000000033%\n\
-fp4-7:   000000000000034% 000000000000035% 000000000000036% 000000000000037%\n\
-fp8-11:  000000000000038% 000000000000038% 00000000000003a% 00000000000003b%\n\
-fp12-15: 00000000000003c% 00000000000003d% 00000000000003e% 00000000000003f%\n\
-fp16-19: 000000000000040% 000000000000041% 000000000000042% 000000000000043%\n\
-fp20-23: 000000000000044% 000000000000045% 000000000000046% 000000000000047%\n\
-fp24-27: 000000000000048% 000000000000049% 00000000000004a% 00000000000004b%\n\
-fp28-31: 00000000000004c% 00000000000004d% 00000000000004e% 00000000000004f%\n\
-";
-
-/* Most of the fields are self-explanatory.  'sr0' is the next
-   instruction to execute, from SRR0, which may have some relationship
-   with the instruction that caused the exception.  'r3*' is the value
-   that will be returned in register 3 when the current system call
-   returns.  'sr1' is SRR1, bits 16-31 of which are copied from the MSR:
-
-   16 - External interrupt enable
-   17 - Privilege level (1=user, 0=supervisor)
-   18 - FP available
-   19 - Machine check enable (if clear, processor locks up on machine check)
-   20 - FP exception mode bit 0 (FP exceptions recoverable)
-   21 - Single-step trace enable
-   22 - Branch trace enable
-   23 - FP exception mode bit 1
-   25 - exception prefix (if set, exceptions are taken from 0xFFFnnnnn,
-        otherwise from 0x000nnnnn).
-   26 - Instruction address translation enabled.
-   27 - Data address translation enabled.
-   30 - Exception is recoverable (otherwise, don't try to return).
-   31 - Little-endian mode enable.
-
-   'Trap' is the address of the exception:
-
-   00200 - Machine check exception (memory parity error, for instance)
-   00300 - Data access exception (memory not mapped, see dsisr for why)
-   00400 - Instruction access exception (memory not mapped)
-   00500 - External interrupt
-   00600 - Alignment exception (see dsisr for more information)
-   00700 - Program exception (illegal/trap instruction, FP exception)
-   00800 - FP unavailable (should not be seen by user code)
-   00900 - Decrementer exception (for instance, SIGALRM)
-   00A00 - I/O controller interface exception
-   00C00 - System call exception (for instance, kill(3)).
-   00E00 - FP assist exception (optional FP instructions, etc.)
-
-   'dar' is the memory location, for traps 00300, 00400, 00600, 00A00.
-   'dsisr' has the following bits under trap 00300:
-   0 - direct-store error exception
-   1 - no page table entry for page
-   4 - memory access not permitted
-   5 - trying to access I/O controller space or using lwarx/stwcx on
-       non-write-cached memory
-   6 - access was store
-   9 - data access breakpoint hit
-   10 - segment table search failed to find translation (64-bit ppcs only)
-   11 - I/O controller instruction not permitted
-   For trap 00400, the same bits are set in SRR1 instead.
-   For trap 00600, bits 12-31 of the DSISR set to allow emulation of
-   the instruction without actually having to read it from memory.
-*/
-
-#define xtoi(x) (x >= 'a' ? x + 10 - 'a' : x - '0')
-
-static void
-register_dump (int fd, struct sigcontext *ctx)
-{
-  char buffer[sizeof (dumpform)];
-  char *bufferpos;
-  unsigned regno;
-  unsigned long *regs = (unsigned long *)(ctx->regs);
-
-  memcpy(buffer, dumpform, sizeof (dumpform));
-
-  /* Generate the output.  */
-  while ((bufferpos = memchr (buffer, '%', sizeof (dumpform))))
-    {
-      regno = xtoi (bufferpos[-1]) | xtoi (bufferpos[-2]) << 4;
-      memset (bufferpos-2, '0', 3);
-      _itoa_word (regs[regno], bufferpos+1, 16, 0);
-    }
-
-  /* Write the output.  */
-  write (fd, buffer, sizeof (buffer) - 1);
-}
-
-
-#define REGISTER_DUMP \
-  register_dump (fd, ctx)