| Brian Silverman | 8649792 | 2018-02-10 19:28:39 -0500 | [diff] [blame] | 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 | 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 | 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 | } |