xref: /third_party/elfutils/backends/linux-core-note.c

/* Common core note type descriptions for Linux.
   Copyright (C) 2007-2010 Red Hat, Inc.
   Copyright (C) H.J. Lu <hjl.tools@gmail.com>, 2015.
   This file is part of elfutils.

   This file is free software; you can redistribute it and/or modify
   it under the terms of either

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at
       your option) any later version

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at
       your option) any later version

   or both in parallel, as here.

   elfutils 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
   General Public License for more details.

   You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <http://www.gnu.org/licenses/>.  */

#include <string.h>

/* The including CPU_corenote.c file provides prstatus_regs and
   defines macros ULONG, [PUG]ID_T, and ALIGN_*, TYPE_*.

   Here we describe the common layout used in <linux/elfcore.h>.  */

#define	CHAR			int8_t
#define	ALIGN_CHAR		1
#define	TYPE_CHAR		ELF_T_BYTE
#define	SHORT			uint16_t
#define ALIGN_SHORT		2
#define TYPE_SHORT		ELF_T_HALF
#define	INT			int32_t
#ifndef ALIGN_INT
# define ALIGN_INT		4
#endif
#define TYPE_INT		ELF_T_SWORD
#ifndef PR_REG
# define PR_REG			ULONG
#endif
#ifndef ALIGN_PR_REG
# define ALIGN_PR_REG		ALIGN_ULONG
#endif
#ifndef PRPSINFO_UID_T
# define PRPSINFO_UID_T		UID_T
# define ALIGN_PRPSINFO_UID_T	ALIGN_UID_T
# define TYPE_PRPSINFO_UID_T	TYPE_UID_T
#endif
#ifndef PRPSINFO_GID_T
# define PRPSINFO_GID_T		GID_T
# define ALIGN_PRPSINFO_GID_T	ALIGN_GID_T
# define TYPE_PRPSINFO_GID_T	TYPE_GID_T
#endif

#define FIELD(type, name) type name __attribute__ ((aligned (ALIGN_##type)))

struct EBLHOOK(siginfo)
{
  FIELD (INT, si_signo);
  FIELD (INT, si_code);
  FIELD (INT, si_errno);
};

struct EBLHOOK(timeval)
{
  FIELD (ULONG, tv_sec);
  FIELD (ULONG, tv_usec);
};

/* On sparc64, tv_usec (suseconds_t) is actually 32 bits with 32 bits padding.
   The 'T'|0x80 value for .format indicates this as a special kludge.  */
#if SUSECONDS_HALF
# define TIMEVAL_FIELD(name)	FIELD (time, ULONG, name, 'T'|0x80, .count = 2)
#else
# define TIMEVAL_FIELD(name)	FIELD (time, ULONG, name, 'T', .count = 2)
#endif


struct EBLHOOK(prstatus)
{
  struct EBLHOOK(siginfo) pr_info;
  FIELD (SHORT, pr_cursig);
  FIELD (ULONG, pr_sigpend);
  FIELD (ULONG, pr_sighold);
  FIELD (PID_T, pr_pid);
  FIELD (PID_T, pr_ppid);
  FIELD (PID_T, pr_pgrp);
  FIELD (PID_T, pr_sid);
  struct EBLHOOK(timeval) pr_utime;
  struct EBLHOOK(timeval) pr_stime;
  struct EBLHOOK(timeval) pr_cutime;
  struct EBLHOOK(timeval) pr_cstime;
  struct
  {
    FIELD (PR_REG, pr_reg[PRSTATUS_REGS_SIZE / sizeof (PR_REG)]);
  }
#ifdef ALIGN_PR_REG
    __attribute__ ((aligned (ALIGN_PR_REG)))
#endif
    ;
  FIELD (INT, pr_fpvalid);
}
#ifdef ALIGN_PRSTATUS
  attribute_packed __attribute__ ((aligned (ALIGN_PRSTATUS)))
#endif
;

#define	FNAMESZ	16
#define	PRARGSZ	80

struct EBLHOOK(prpsinfo)
{
  FIELD (CHAR, pr_state);
  FIELD (CHAR, pr_sname);
  FIELD (CHAR, pr_zomb);
  FIELD (CHAR, pr_nice);
  FIELD (ULONG, pr_flag);
  FIELD (PRPSINFO_UID_T, pr_uid);
  FIELD (PRPSINFO_GID_T, pr_gid);
  FIELD (PID_T, pr_pid);
  FIELD (PID_T, pr_ppid);
  FIELD (PID_T, pr_pgrp);
  FIELD (PID_T, pr_sid);
  FIELD (CHAR, pr_fname[FNAMESZ]);
  FIELD (CHAR, pr_psargs[PRARGSZ]);
};

#undef	FIELD

#define FIELD(igroup, itype, item, fmt, ...)			\
    {								\
      .name = #item,						\
      .group = #igroup,					\
      .offset = offsetof (struct EBLHOOK(prstatus), pr_##item),	\
      .type = TYPE_##itype,					\
      .format = fmt,						\
      __VA_ARGS__						\
    }

static const Ebl_Core_Item prstatus_items[] =
  {
    FIELD (signal, INT, info.si_signo, 'd'),
    FIELD (signal, INT, info.si_code, 'd'),
    FIELD (signal, INT, info.si_errno, 'd'),
    FIELD (signal, SHORT, cursig, 'd'),

    /* Use different group name for a newline delimiter.  */
    FIELD (signal2, ULONG, sigpend, 'B'),
    FIELD (signal3, ULONG, sighold, 'B'),
    FIELD (identity, PID_T, pid, 'd', .thread_identifier = true),
    FIELD (identity, PID_T, ppid, 'd'),
    FIELD (identity, PID_T, pgrp, 'd'),
    FIELD (identity, PID_T, sid, 'd'),
    TIMEVAL_FIELD (utime),
    TIMEVAL_FIELD (stime),
    TIMEVAL_FIELD (cutime),
    TIMEVAL_FIELD (cstime),
#ifdef PRSTATUS_REGSET_ITEMS
    PRSTATUS_REGSET_ITEMS,
#endif
    FIELD (register, INT, fpvalid, 'd'),
  };

#undef	FIELD

#define FIELD(igroup, itype, item, fmt, ...)			\
    {								\
      .name = #item,						\
      .group = #igroup,					\
      .offset = offsetof (struct EBLHOOK(prpsinfo), pr_##item),	\
      .type = TYPE_##itype,					\
      .format = fmt,						\
      __VA_ARGS__						\
    }

static const Ebl_Core_Item prpsinfo_items[] =
  {
    FIELD (state, CHAR, state, 'd'),
    FIELD (state, CHAR, sname, 'c'),
    FIELD (state, CHAR, zomb, 'd'),
    FIELD (state, CHAR, nice, 'd'),
    FIELD (state, ULONG, flag, 'x'),
    FIELD (identity, PRPSINFO_UID_T, uid, 'd'),
    FIELD (identity, PRPSINFO_GID_T, gid, 'd'),
    FIELD (identity, PID_T, pid, 'd'),
    FIELD (identity, PID_T, ppid, 'd'),
    FIELD (identity, PID_T, pgrp, 'd'),
    FIELD (identity, PID_T, sid, 'd'),
    FIELD (command, CHAR, fname, 's', .count = FNAMESZ),
    FIELD (command, CHAR, psargs, 's', .count = PRARGSZ),
  };

static const Ebl_Core_Item vmcoreinfo_items[] =
  {
    {
      .type = ELF_T_BYTE, .format = '\n'
    }
  };

#undef	FIELD

int
EBLHOOK(core_note) (const GElf_Nhdr *nhdr, const char *name,
		    GElf_Word *regs_offset, size_t *nregloc,
		    const Ebl_Register_Location **reglocs,
		    size_t *nitems, const Ebl_Core_Item **items)
{
  switch (nhdr->n_namesz)
    {
    case sizeof "CORE" - 1:	/* Buggy old Linux kernels.  */
      if (memcmp (name, "CORE", nhdr->n_namesz) == 0)
	break;
      return 0;

    case sizeof "CORE":
      if (memcmp (name, "CORE", nhdr->n_namesz) == 0)
	break;
      /* Buggy old Linux kernels didn't terminate "LINUX".  */
      FALLTHROUGH;

    case sizeof "LINUX":
      if (memcmp (name, "LINUX", nhdr->n_namesz) == 0)
	break;
      return 0;

    case sizeof "VMCOREINFO":
      if (nhdr->n_type != 0
	  || memcmp (name, "VMCOREINFO", sizeof "VMCOREINFO") != 0)
	return 0;
      *regs_offset = 0;
      *nregloc = 0;
      *nitems = 1;
      *items = vmcoreinfo_items;
      return 1;

    default:
      return 0;
    }

  switch (nhdr->n_type)
    {
    case NT_PRSTATUS:
      if (nhdr->n_descsz != sizeof (struct EBLHOOK(prstatus)))
	return 0;
      *regs_offset = offsetof (struct EBLHOOK(prstatus), pr_reg);
      *nregloc = sizeof prstatus_regs / sizeof prstatus_regs[0];
      *reglocs = prstatus_regs;
      *nitems = sizeof prstatus_items / sizeof prstatus_items[0];
      *items = prstatus_items;
      return 1;

    case NT_PRPSINFO:
      if (nhdr->n_descsz != sizeof (struct EBLHOOK(prpsinfo)))
	return 0;
      *regs_offset = 0;
      *nregloc = 0;
      *reglocs = NULL;
      *nitems = sizeof prpsinfo_items / sizeof prpsinfo_items[0];
      *items = prpsinfo_items;
      return 1;

#define EXTRA_REGSET(type, size, table)					      \
    case type:								      \
      if (nhdr->n_descsz != size)					      \
	return 0;							      \
      *regs_offset = 0;							      \
      *nregloc = sizeof table / sizeof table[0];			      \
      *reglocs = table;							      \
      *nitems = 0;							      \
      *items = NULL;							      \
      return 1;

#define EXTRA_REGSET_ITEMS(type, size, table, extra_items)		      \
    case type:								      \
      if (nhdr->n_descsz != size)					      \
	return 0;							      \
      *regs_offset = 0;							      \
      *nregloc = sizeof table / sizeof table[0];			      \
      *reglocs = table;							      \
      *nitems = sizeof extra_items / sizeof extra_items[0];		      \
      *items = extra_items;						      \
      return 1;

#define EXTRA_ITEMS(type, size, extra_items)				      \
    case type:								      \
      if (nhdr->n_descsz != size)					      \
	return 0;							      \
      *regs_offset = 0;							      \
      *nregloc = 0;							      \
      *reglocs = NULL;							      \
      *nitems = sizeof extra_items / sizeof extra_items[0];		      \
      *items = extra_items;						      \
      return 1;

#ifdef FPREGSET_SIZE
    EXTRA_REGSET (NT_FPREGSET, FPREGSET_SIZE, fpregset_regs)
#endif

#ifdef EXTRA_NOTES
    EXTRA_NOTES
#endif
    }

  return 0;
}