Line data Source code
1 : /* Fetch live process registers from TID.
2 : Copyright (C) 2013, 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 : #include "system.h"
34 : #include <assert.h>
35 : #if defined(__aarch64__) && defined(__linux__)
36 : # include <linux/uio.h>
37 : # include <sys/user.h>
38 : # include <sys/ptrace.h>
39 : /* Deal with old glibc defining user_pt_regs instead of user_regs_struct. */
40 : # ifndef HAVE_SYS_USER_REGS
41 : # define user_regs_struct user_pt_regs
42 : # define user_fpsimd_struct user_fpsimd_state
43 : # endif
44 : #endif
45 :
46 : #define BACKEND aarch64_
47 : #include "libebl_CPU.h"
48 :
49 : bool
50 0 : aarch64_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
51 : ebl_tid_registers_t *setfunc __attribute__ ((unused)),
52 : void *arg __attribute__ ((unused)))
53 : {
54 : #if !defined(__aarch64__) || !defined(__linux__)
55 0 : return false;
56 : #else /* __aarch64__ */
57 :
58 : /* General registers. */
59 : struct user_regs_struct gregs;
60 : struct iovec iovec;
61 : iovec.iov_base = &gregs;
62 : iovec.iov_len = sizeof (gregs);
63 : if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
64 : return false;
65 :
66 : /* X0..X30 plus SP. */
67 : if (! setfunc (0, 32, (Dwarf_Word *) &gregs.regs[0], arg))
68 : return false;
69 :
70 : /* PC. */
71 : if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.pc, arg))
72 : return false;
73 :
74 : /* ELR cannot be found. */
75 :
76 : /* FP registers (only 64bits are used). */
77 : struct user_fpsimd_struct fregs;
78 : iovec.iov_base = &fregs;
79 : iovec.iov_len = sizeof (fregs);
80 : if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec) != 0)
81 : return false;
82 :
83 : Dwarf_Word dwarf_fregs[32];
84 : for (int r = 0; r < 32; r++)
85 : dwarf_fregs[r] = fregs.vregs[r] & 0xFFFFFFFF;
86 :
87 : if (! setfunc (64, 32, dwarf_fregs, arg))
88 : return false;
89 :
90 : return true;
91 : #endif /* __aarch64__ */
92 : }
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