/* Dump registers.
   Copyright (C) 1998-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Andreas Schwab <schwab@gnu.org>.

   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
   <http://www.gnu.org/licenses/>.  */

#include <stddef.h>
#include <sys/uio.h>
#include <_itoa.h>

/* We will print the register dump in this format:

  D0: XXXXXXXX   D1: XXXXXXXX   D2: XXXXXXXX   D3: XXXXXXXX
  D4: XXXXXXXX   D5: XXXXXXXX   D6: XXXXXXXX   D7: XXXXXXXX
  A0: XXXXXXXX   A1: XXXXXXXX   A2: XXXXXXXX   A3: XXXXXXXX
  A4: XXXXXXXX   A5: XXXXXXXX   A6: XXXXXXXX   A7: XXXXXXXX
  PC: XXXXXXXX   SR: XXXX

  OldMask: XXXXXXXX  Vector: XXXX

  FP0: XXXXXXXXXXXXXXXXXXXXXXXX   FP1: XXXXXXXXXXXXXXXXXXXXXXXX
  FP2: XXXXXXXXXXXXXXXXXXXXXXXX   FP3: XXXXXXXXXXXXXXXXXXXXXXXX
  FP4: XXXXXXXXXXXXXXXXXXXXXXXX   FP5: XXXXXXXXXXXXXXXXXXXXXXXX
  FP6: XXXXXXXXXXXXXXXXXXXXXXXX   FP7: XXXXXXXXXXXXXXXXXXXXXXXX
  FPCR: XXXXXXXX   FPSR: XXXXXXXX   FPIAR: XXXXXXXX

*/

/* Linux saves only the call-clobbered registers in the sigcontext.  We
   need to use a trampoline that saves the rest so that the C code can
   access them.  We use the sc_fpstate field, since the handler is not
   supposed to return anyway, thus it doesn't matter that it's clobbered.  */

/* static */ void catch_segfault (int, int, struct sigcontext *);

/* Dummy function so that we can use asm with arguments.  */
static void __attribute_used__
__dummy__ (void)
{
  asm ("\n\
catch_segfault:\n\
	move.l 12(%%sp),%%a0\n\
	lea %c0(%%a0),%%a0\n\
	/* Clear the first 4 bytes to make it a null fp state, just\n\
	   in case the handler does return.  */\n\
	clr.l (%%a0)+\n\
	movem.l %%d2-%%d7/%%a2-%%a6,(%%a0)\n"
#ifndef __mcoldfire__
       "fmovem.x %%fp2-%%fp7,11*4(%%a0)\n"
#elif defined __mcffpu__
       "fmovem.d %%fp2-%%fp7,11*4(%%a0)\n"
#endif
       "jra real_catch_segfault"
       : : "n" (offsetof (struct sigcontext, sc_fpstate)));
}
#define catch_segfault(a,b) \
  __attribute_used__ real_catch_segfault(a,b)

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 sigcontext *ctx)
{
  char regs[20][8];
  char fpregs[11][24];
  struct iovec iov[63], *next_iov = iov;
  unsigned long *p = (unsigned long *) ctx->sc_fpstate + 1;
  unsigned long *pfp = (unsigned long *) ctx->sc_fpregs;
  int i, j, fpreg_size;

#define ADD_STRING(str) \
  next_iov->iov_base = (char *) (str); \
  next_iov->iov_len = strlen (str); \
  ++next_iov
#define ADD_MEM(str, len) \
  next_iov->iov_base = (str); \
  next_iov->iov_len = (len); \
  ++next_iov

#ifdef __mcoldfire__
  fpreg_size = 16;
#else
  fpreg_size = 24;
#endif

  /* Generate strings of register contents.  */
  hexvalue (ctx->sc_d0, regs[0], 8);
  hexvalue (ctx->sc_d1, regs[1], 8);
  hexvalue (*p++, regs[2], 8);
  hexvalue (*p++, regs[3], 8);
  hexvalue (*p++, regs[4], 8);
  hexvalue (*p++, regs[5], 8);
  hexvalue (*p++, regs[6], 8);
  hexvalue (*p++, regs[7], 8);
  hexvalue (ctx->sc_a0, regs[8], 8);
  hexvalue (ctx->sc_a1, regs[9], 8);
  hexvalue (*p++, regs[10], 8);
  hexvalue (*p++, regs[11], 8);
  hexvalue (*p++, regs[12], 8);
  hexvalue (*p++, regs[13], 8);
  hexvalue (*p++, regs[14], 8);
  hexvalue (ctx->sc_usp, regs[15], 8);
  hexvalue (ctx->sc_pc, regs[16], 8);
  hexvalue (ctx->sc_sr, regs[17], 4);
  hexvalue (ctx->sc_mask, regs[18], 8);
  hexvalue (ctx->sc_formatvec & 0xfff, regs[19], 4);
  for (i = 0; i < 2; i++)
    for (j = 0; j < fpreg_size; j += 8)
      hexvalue (*pfp++, fpregs[i] + j, 8);
  for (i = 2; i < 8; i++)
    for (j = 0; j < fpreg_size; j += 8)
      hexvalue (*p++, fpregs[i] + j, 8);
  hexvalue (ctx->sc_fpcntl[0], fpregs[8], 8);
  hexvalue (ctx->sc_fpcntl[1], fpregs[9], 8);
  hexvalue (ctx->sc_fpcntl[2], fpregs[10], 8);

  /* Generate the output.  */
  ADD_STRING ("Register dump:\n\n  D0: ");
  ADD_MEM (regs[0], 8);
  ADD_STRING ("  D1: ");
  ADD_MEM (regs[1], 8);
  ADD_STRING ("  D2: ");
  ADD_MEM (regs[2], 8);
  ADD_STRING ("  D3: ");
  ADD_MEM (regs[3], 8);
  ADD_STRING ("\n  D4: ");
  ADD_MEM (regs[4], 8);
  ADD_STRING ("  D5: ");
  ADD_MEM (regs[5], 8);
  ADD_STRING ("  D6: ");
  ADD_MEM (regs[6], 8);
  ADD_STRING ("  D7: ");
  ADD_MEM (regs[7], 8);
  ADD_STRING ("\n  A0: ");
  ADD_MEM (regs[8], 8);
  ADD_STRING ("  A1: ");
  ADD_MEM (regs[9], 8);
  ADD_STRING ("  A2: ");
  ADD_MEM (regs[10], 8);
  ADD_STRING ("  A3: ");
  ADD_MEM (regs[11], 8);
  ADD_STRING ("\n  A4: ");
  ADD_MEM (regs[12], 8);
  ADD_STRING ("  A5: ");
  ADD_MEM (regs[13], 8);
  ADD_STRING ("  A6: ");
  ADD_MEM (regs[14], 8);
  ADD_STRING ("  A7: ");
  ADD_MEM (regs[15], 8);
  ADD_STRING ("\n  PC: ");
  ADD_MEM (regs[16], 8);
  ADD_STRING ("  SR: ");
  ADD_MEM (regs[17], 4);

  ADD_STRING ("\n\n  OldMask: ");
  ADD_MEM (regs[18], 8);
  ADD_STRING ("  Vector: ");
  ADD_MEM (regs[19], 4);

  ADD_STRING ("\n\n  FP0: ");
  ADD_MEM (fpregs[0], fpreg_size);
  ADD_STRING ("  FP1: ");
  ADD_MEM (fpregs[1], fpreg_size);
  ADD_STRING ("\n  FP2: ");
  ADD_MEM (fpregs[2], fpreg_size);
  ADD_STRING ("  FP3: ");
  ADD_MEM (fpregs[3], fpreg_size);
  ADD_STRING ("\n  FP4: ");
  ADD_MEM (fpregs[4], fpreg_size);
  ADD_STRING ("  FP5: ");
  ADD_MEM (fpregs[5], fpreg_size);
  ADD_STRING ("\n  FP6: ");
  ADD_MEM (fpregs[6], fpreg_size);
  ADD_STRING ("  FP7: ");
  ADD_MEM (fpregs[7], fpreg_size);
  ADD_STRING ("\n  FPCR: ");
  ADD_MEM (fpregs[8], 8);
  ADD_STRING ("  FPSR: ");
  ADD_MEM (fpregs[9], 8);
  ADD_STRING ("  FPIAR: ");
  ADD_MEM (fpregs[10], 8);
  ADD_STRING ("\n");

  /* Write the stuff out.  */
  writev (fd, iov, next_iov - iov);
}

#define REGISTER_DUMP register_dump (fd, ctx)
