1/* Fetch live process registers from TID.
2   Copyright (C) 2014 Red Hat, Inc.
3   This file is part of elfutils.
4
5   This file is free software; you can redistribute it and/or modify
6   it under the terms of either
7
8     * the GNU Lesser General Public License as published by the Free
9       Software Foundation; either version 3 of the License, or (at
10       your option) any later version
11
12   or
13
14     * the GNU General Public License as published by the Free
15       Software Foundation; either version 2 of the License, or (at
16       your option) any later version
17
18   or both in parallel, as here.
19
20   elfutils is distributed in the hope that it will be useful, but
21   WITHOUT ANY WARRANTY; without even the implied warranty of
22   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
23   General Public License for more details.
24
25   You should have received copies of the GNU General Public License and
26   the GNU Lesser General Public License along with this program.  If
27   not, see <http://www.gnu.org/licenses/>.  */
28
29#ifdef HAVE_CONFIG_H
30# include <config.h>
31#endif
32
33#ifdef __linux__
34#if defined __arm__
35# include <sys/types.h>
36# include <sys/user.h>
37# include <sys/ptrace.h>
38#endif
39
40#ifdef __aarch64__
41# include <linux/uio.h>
42# include <sys/user.h>
43# include <sys/ptrace.h>
44/* Deal with old glibc defining user_pt_regs instead of user_regs_struct.  */
45# ifndef HAVE_SYS_USER_REGS
46#  define user_regs_struct user_pt_regs
47# endif
48#endif
49#endif
50
51#define BACKEND arm_
52#include "libebl_CPU.h"
53
54bool
55arm_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
56			  ebl_tid_registers_t *setfunc __attribute__ ((unused)),
57			       void *arg __attribute__ ((unused)))
58{
59#if !defined(__linux__) || (!defined __arm__ && !defined __aarch64__)
60  return false;
61#else	/* __arm__ || __aarch64__ */
62#if defined __arm__
63  struct user_regs user_regs;
64  if (ptrace (PTRACE_GETREGS, tid, NULL, &user_regs) != 0)
65    return false;
66
67  Dwarf_Word dwarf_regs[16];
68  /* R0..R12 SP LR PC */
69  for (int i = 0; i < 16; i++)
70    dwarf_regs[i] = user_regs.uregs[i];
71
72  return setfunc (0, 16, dwarf_regs, arg);
73#elif defined __aarch64__
74  /* Compat mode: arm compatible code running on aarch64 */
75  int i;
76  struct user_regs_struct gregs;
77  struct iovec iovec;
78  iovec.iov_base = &gregs;
79  iovec.iov_len = sizeof (gregs);
80  if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
81    return false;
82
83  Dwarf_Word dwarf_regs[16];
84  /* R0..R12 SP LR PC, encoded as 32 bit quantities */
85  uint32_t *u32_ptr = (uint32_t *) &gregs.regs[0];
86  for (i = 0; i < 16; i++)
87    dwarf_regs[i] = u32_ptr[i];
88
89  return setfunc (0, 16, dwarf_regs, arg);
90#else
91# error "source file error, it cannot happen"
92#endif
93#endif
94}
95