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 #if defined __arm__
34 # include <sys/types.h>
35 # include <sys/user.h>
36 # include <sys/ptrace.h>
37 #endif
38
39 #ifdef __aarch64__
40 # include <linux/uio.h>
41 # include <sys/user.h>
42 # include <sys/ptrace.h>
43 /* Deal with old glibc defining user_pt_regs instead of user_regs_struct. */
44 # ifndef HAVE_SYS_USER_REGS
45 # define user_regs_struct user_pt_regs
46 # endif
47 #endif
48
49 #define BACKEND arm_
50 #include "libebl_CPU.h"
51
52 bool
arm_set_initial_registers_tid(pid_t tid,ebl_tid_registers_t * setfunc,void * arg)53 arm_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
54 ebl_tid_registers_t *setfunc __attribute__ ((unused)),
55 void *arg __attribute__ ((unused)))
56 {
57 #if !defined __arm__ && !defined __aarch64__
58 return false;
59 #else /* __arm__ || __aarch64__ */
60 #if defined __arm__
61 struct user_regs user_regs;
62 if (ptrace (PTRACE_GETREGS, tid, NULL, &user_regs) != 0)
63 return false;
64
65 Dwarf_Word dwarf_regs[16];
66 /* R0..R12 SP LR PC */
67 for (int i = 0; i < 16; i++)
68 dwarf_regs[i] = user_regs.uregs[i];
69
70 return setfunc (0, 16, dwarf_regs, arg);
71 #elif defined __aarch64__
72 /* Compat mode: arm compatible code running on aarch64 */
73 int i;
74 struct user_regs_struct gregs;
75 struct iovec iovec;
76 iovec.iov_base = &gregs;
77 iovec.iov_len = sizeof (gregs);
78 if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
79 return false;
80
81 Dwarf_Word dwarf_regs[16];
82 /* R0..R12 SP LR PC, encoded as 32 bit quantities */
83 uint32_t *u32_ptr = (uint32_t *) &gregs.regs[0];
84 for (i = 0; i < 16; i++)
85 dwarf_regs[i] = u32_ptr[i];
86
87 return setfunc (0, 16, dwarf_regs, arg);
88 #else
89 # error "source file error, it cannot happen"
90 #endif
91 #endif
92 }
93