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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.
This commit is contained in:
Adhemerval Zanella
@ -1,176 +0,0 @@
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/* Dump registers.
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Copyright (C) 1998-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <sys/uio.h>
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#include <_itoa.h>
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/* We will print the register dump in this format:
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D0: XXXXXXXX D1: XXXXXXXX D2: XXXXXXXX D3: XXXXXXXX
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D4: XXXXXXXX D5: XXXXXXXX D6: XXXXXXXX D7: XXXXXXXX
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A0: XXXXXXXX A1: XXXXXXXX A2: XXXXXXXX A3: XXXXXXXX
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A4: XXXXXXXX A5: XXXXXXXX A6: XXXXXXXX A7: XXXXXXXX
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PC: XXXXXXXX SR: XXXX
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OldMask: XXXXXXXX Vector: XXXX
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FP0: XXXXXXXXXXXXXXXXXXXXXXXX FP1: XXXXXXXXXXXXXXXXXXXXXXXX
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FP2: XXXXXXXXXXXXXXXXXXXXXXXX FP3: XXXXXXXXXXXXXXXXXXXXXXXX
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FP4: XXXXXXXXXXXXXXXXXXXXXXXX FP5: XXXXXXXXXXXXXXXXXXXXXXXX
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FP6: XXXXXXXXXXXXXXXXXXXXXXXX FP7: XXXXXXXXXXXXXXXXXXXXXXXX
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FPCR: XXXXXXXX FPSR: XXXXXXXX FPIAR: XXXXXXXX
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*/
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#define FPCONTEXT_SIZE 216
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#define uc_formatvec __glibc_reserved1[FPCONTEXT_SIZE/4]
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#define uc_oldmask uc_sigmask.__val[0]
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static void
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hexvalue (unsigned long int value, char *buf, size_t len)
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{
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char *cp = _itoa_word (value, buf + len, 16, 0);
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while (cp > buf)
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*--cp = '0';
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}
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static void
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register_dump (int fd, struct ucontext_t *ctx)
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{
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char regs[20][8];
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char fpregs[11][24];
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struct iovec iov[63], *next_iov = iov;
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int i, j, fpreg_size;
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#define ADD_STRING(str) \
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next_iov->iov_base = (char *) (str); \
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next_iov->iov_len = strlen (str); \
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++next_iov
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#define ADD_MEM(str, len) \
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next_iov->iov_base = (str); \
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next_iov->iov_len = (len); \
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++next_iov
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#ifdef __mcoldfire__
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fpreg_size = 16;
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#else
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fpreg_size = 24;
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#endif
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/* Generate strings of register contents. */
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hexvalue (ctx->uc_mcontext.gregs[R_D0], regs[0], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D1], regs[1], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D2], regs[2], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D3], regs[3], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D4], regs[4], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D5], regs[5], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D6], regs[6], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_D7], regs[7], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A0], regs[8], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A1], regs[9], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A2], regs[10], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A3], regs[11], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A4], regs[12], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A5], regs[13], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_A6], regs[14], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_SP], regs[15], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_PC], regs[16], 8);
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hexvalue (ctx->uc_mcontext.gregs[R_PS], regs[17], 4);
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hexvalue (ctx->uc_oldmask, regs[18], 8);
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hexvalue (ctx->uc_formatvec & 0xfff, regs[19], 4);
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for (i = 0; i < 8; i++)
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for (j = 0; j < fpreg_size; j += 8)
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hexvalue (ctx->uc_mcontext.fpregs.f_fpregs[i][j/8], fpregs[i] + j, 8);
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hexvalue (ctx->uc_mcontext.fpregs.f_pcr, fpregs[8], 8);
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hexvalue (ctx->uc_mcontext.fpregs.f_psr, fpregs[9], 8);
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hexvalue (ctx->uc_mcontext.fpregs.f_fpiaddr, fpregs[10], 8);
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/* Generate the output. */
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ADD_STRING ("Register dump:\n\n D0: ");
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ADD_MEM (regs[0], 8);
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ADD_STRING (" D1: ");
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ADD_MEM (regs[1], 8);
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ADD_STRING (" D2: ");
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ADD_MEM (regs[2], 8);
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ADD_STRING (" D3: ");
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ADD_MEM (regs[3], 8);
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ADD_STRING ("\n D4: ");
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ADD_MEM (regs[4], 8);
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ADD_STRING (" D5: ");
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ADD_MEM (regs[5], 8);
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ADD_STRING (" D6: ");
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ADD_MEM (regs[6], 8);
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ADD_STRING (" D7: ");
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ADD_MEM (regs[7], 8);
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ADD_STRING ("\n A0: ");
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ADD_MEM (regs[8], 8);
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ADD_STRING (" A1: ");
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ADD_MEM (regs[9], 8);
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ADD_STRING (" A2: ");
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ADD_MEM (regs[10], 8);
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ADD_STRING (" A3: ");
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ADD_MEM (regs[11], 8);
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ADD_STRING ("\n A4: ");
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ADD_MEM (regs[12], 8);
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ADD_STRING (" A5: ");
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ADD_MEM (regs[13], 8);
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ADD_STRING (" A6: ");
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ADD_MEM (regs[14], 8);
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ADD_STRING (" A7: ");
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ADD_MEM (regs[15], 8);
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ADD_STRING ("\n PC: ");
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ADD_MEM (regs[16], 8);
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ADD_STRING (" SR: ");
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ADD_MEM (regs[17], 4);
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ADD_STRING ("\n\n OldMask: ");
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ADD_MEM (regs[18], 8);
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ADD_STRING (" Vector: ");
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ADD_MEM (regs[19], 4);
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ADD_STRING ("\n\n FP0: ");
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ADD_MEM (fpregs[0], fpreg_size);
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ADD_STRING (" FP1: ");
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ADD_MEM (fpregs[1], fpreg_size);
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ADD_STRING ("\n FP2: ");
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ADD_MEM (fpregs[2], fpreg_size);
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ADD_STRING (" FP3: ");
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ADD_MEM (fpregs[3], fpreg_size);
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ADD_STRING ("\n FP4: ");
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ADD_MEM (fpregs[4], fpreg_size);
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ADD_STRING (" FP5: ");
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ADD_MEM (fpregs[5], fpreg_size);
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ADD_STRING ("\n FP6: ");
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ADD_MEM (fpregs[6], fpreg_size);
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ADD_STRING (" FP7: ");
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ADD_MEM (fpregs[7], fpreg_size);
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ADD_STRING ("\n FPCR: ");
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ADD_MEM (fpregs[8], 8);
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ADD_STRING (" FPSR: ");
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ADD_MEM (fpregs[9], 8);
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ADD_STRING (" FPIAR: ");
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ADD_MEM (fpregs[10], 8);
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ADD_STRING ("\n");
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/* Write the stuff out. */
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writev (fd, iov, next_iov - iov);
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}
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#define REGISTER_DUMP register_dump (fd, ctx)
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