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
riscv_set_initial_registers_tid(pid_t tid,ebl_tid_registers_t * setfunc,void * arg)44 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 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 }
78