Branch data Line data Source code
1 : : /* Fetch live process registers from TID.
2 : : This file is part of elfutils.
3 : :
4 : : This file is free software; you can redistribute it and/or modify
5 : : it under the terms of either
6 : :
7 : : * the GNU Lesser General Public License as published by the Free
8 : : Software Foundation; either version 3 of the License, or (at
9 : : your option) any later version
10 : :
11 : : or
12 : :
13 : : * the GNU General Public License as published by the Free
14 : : Software Foundation; either version 2 of the License, or (at
15 : : your option) any later version
16 : :
17 : : or both in parallel, as here.
18 : :
19 : : elfutils is distributed in the hope that it will be useful, but
20 : : WITHOUT ANY WARRANTY; without even the implied warranty of
21 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 : : General Public License for more details.
23 : :
24 : : You should have received copies of the GNU General Public License and
25 : : the GNU Lesser General Public License along with this program. If
26 : : not, see <http://www.gnu.org/licenses/>. */
27 : :
28 : : #ifdef HAVE_CONFIG_H
29 : : # include <config.h>
30 : : #endif
31 : :
32 : : #include "system.h"
33 : : #include <assert.h>
34 : : #if defined __riscv && defined __linux__
35 : : # include <sys/uio.h>
36 : : # include <sys/procfs.h>
37 : : # include <sys/ptrace.h>
38 : : #endif
39 : :
40 : : #define BACKEND riscv_
41 : : #include "libebl_CPU.h"
42 : :
43 : : bool
44 : 0 : riscv_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
45 : : ebl_tid_registers_t *setfunc __attribute__ ((unused)),
46 : : void *arg __attribute__ ((unused)))
47 : : {
48 : : #if !defined __riscv || !defined __linux__
49 : 0 : return false;
50 : : #else /* __riscv */
51 : :
52 : : /* General registers. */
53 : : elf_gregset_t gregs;
54 : : struct iovec iovec;
55 : : iovec.iov_base = &gregs;
56 : : iovec.iov_len = sizeof (gregs);
57 : : if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
58 : : return false;
59 : :
60 : : /* X0 is constant 0. */
61 : : Dwarf_Word zero = 0;
62 : : if (! setfunc (0, 1, &zero, arg))
63 : : return false;
64 : :
65 : : /* X1..X31. */
66 : : if (! setfunc (1, 32, (Dwarf_Word *) &gregs[1], arg))
67 : : return false;
68 : :
69 : : /* PC. */
70 : : if (! setfunc (-1, 1, (Dwarf_Word *) &gregs[0], arg))
71 : : return false;
72 : :
73 : : /* FP registers not yet supported. */
74 : :
75 : : return true;
76 : : #endif /* __riscv */
77 : : }
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