| 1 | /* Copyright (C) 2009-2017 Free Software Foundation, Inc. |
| 2 | Contributed by ARM Ltd. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "common-defs.h" |
| 20 | #include "break-common.h" |
| 21 | #include "nat/linux-nat.h" |
| 22 | #include "nat/aarch64-linux-hw-point.h" |
| 23 | #include "nat/aarch64-linux.h" |
| 24 | |
| 25 | #include "elf/common.h" |
| 26 | #include "nat/gdb_ptrace.h" |
| 27 | #include <asm/ptrace.h> |
| 28 | #include <sys/uio.h> |
| 29 | |
| 30 | /* Called when resuming a thread LWP. |
| 31 | The hardware debug registers are updated when there is any change. */ |
| 32 | |
| 33 | void |
| 34 | aarch64_linux_prepare_to_resume (struct lwp_info *lwp) |
| 35 | { |
| 36 | struct arch_lwp_info *info = lwp_arch_private_info (lwp); |
| 37 | |
| 38 | /* NULL means this is the main thread still going through the shell, |
| 39 | or, no watchpoint has been set yet. In that case, there's |
| 40 | nothing to do. */ |
| 41 | if (info == NULL) |
| 42 | return; |
| 43 | |
| 44 | if (DR_HAS_CHANGED (info->dr_changed_bp) |
| 45 | || DR_HAS_CHANGED (info->dr_changed_wp)) |
| 46 | { |
| 47 | ptid_t ptid = ptid_of_lwp (lwp); |
| 48 | int tid = ptid_get_lwp (ptid); |
| 49 | struct aarch64_debug_reg_state *state |
| 50 | = aarch64_get_debug_reg_state (ptid_get_pid (ptid)); |
| 51 | |
| 52 | if (show_debug_regs) |
| 53 | debug_printf ("prepare_to_resume thread %d\n", tid); |
| 54 | |
| 55 | /* Watchpoints. */ |
| 56 | if (DR_HAS_CHANGED (info->dr_changed_wp)) |
| 57 | { |
| 58 | aarch64_linux_set_debug_regs (state, tid, 1); |
| 59 | DR_CLEAR_CHANGED (info->dr_changed_wp); |
| 60 | } |
| 61 | |
| 62 | /* Breakpoints. */ |
| 63 | if (DR_HAS_CHANGED (info->dr_changed_bp)) |
| 64 | { |
| 65 | aarch64_linux_set_debug_regs (state, tid, 0); |
| 66 | DR_CLEAR_CHANGED (info->dr_changed_bp); |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | /* Function to call when a new thread is detected. */ |
| 72 | |
| 73 | void |
| 74 | aarch64_linux_new_thread (struct lwp_info *lwp) |
| 75 | { |
| 76 | struct arch_lwp_info *info = XNEW (struct arch_lwp_info); |
| 77 | |
| 78 | /* Mark that all the hardware breakpoint/watchpoint register pairs |
| 79 | for this thread need to be initialized (with data from |
| 80 | aarch_process_info.debug_reg_state). */ |
| 81 | DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs); |
| 82 | DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs); |
| 83 | |
| 84 | lwp_set_arch_private_info (lwp, info); |
| 85 | } |
| 86 | |
| 87 | /* Convert native siginfo FROM to the siginfo in the layout of the |
| 88 | inferior's architecture TO. */ |
| 89 | |
| 90 | void |
| 91 | aarch64_compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) |
| 92 | { |
| 93 | memset (to, 0, sizeof (*to)); |
| 94 | |
| 95 | to->si_signo = from->si_signo; |
| 96 | to->si_errno = from->si_errno; |
| 97 | to->si_code = from->si_code; |
| 98 | |
| 99 | if (to->si_code == SI_TIMER) |
| 100 | { |
| 101 | to->cpt_si_timerid = from->si_timerid; |
| 102 | to->cpt_si_overrun = from->si_overrun; |
| 103 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 104 | } |
| 105 | else if (to->si_code == SI_USER) |
| 106 | { |
| 107 | to->cpt_si_pid = from->si_pid; |
| 108 | to->cpt_si_uid = from->si_uid; |
| 109 | } |
| 110 | else if (to->si_code < 0) |
| 111 | { |
| 112 | to->cpt_si_pid = from->si_pid; |
| 113 | to->cpt_si_uid = from->si_uid; |
| 114 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 115 | } |
| 116 | else |
| 117 | { |
| 118 | switch (to->si_signo) |
| 119 | { |
| 120 | case SIGCHLD: |
| 121 | to->cpt_si_pid = from->si_pid; |
| 122 | to->cpt_si_uid = from->si_uid; |
| 123 | to->cpt_si_status = from->si_status; |
| 124 | to->cpt_si_utime = from->si_utime; |
| 125 | to->cpt_si_stime = from->si_stime; |
| 126 | break; |
| 127 | case SIGILL: |
| 128 | case SIGFPE: |
| 129 | case SIGSEGV: |
| 130 | case SIGBUS: |
| 131 | to->cpt_si_addr = (intptr_t) from->si_addr; |
| 132 | break; |
| 133 | case SIGPOLL: |
| 134 | to->cpt_si_band = from->si_band; |
| 135 | to->cpt_si_fd = from->si_fd; |
| 136 | break; |
| 137 | default: |
| 138 | to->cpt_si_pid = from->si_pid; |
| 139 | to->cpt_si_uid = from->si_uid; |
| 140 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /* Convert inferior's architecture siginfo FROM to native siginfo TO. */ |
| 147 | |
| 148 | void |
| 149 | aarch64_siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) |
| 150 | { |
| 151 | memset (to, 0, sizeof (*to)); |
| 152 | |
| 153 | to->si_signo = from->si_signo; |
| 154 | to->si_errno = from->si_errno; |
| 155 | to->si_code = from->si_code; |
| 156 | |
| 157 | if (to->si_code == SI_TIMER) |
| 158 | { |
| 159 | to->si_timerid = from->cpt_si_timerid; |
| 160 | to->si_overrun = from->cpt_si_overrun; |
| 161 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 162 | } |
| 163 | else if (to->si_code == SI_USER) |
| 164 | { |
| 165 | to->si_pid = from->cpt_si_pid; |
| 166 | to->si_uid = from->cpt_si_uid; |
| 167 | } |
| 168 | if (to->si_code < 0) |
| 169 | { |
| 170 | to->si_pid = from->cpt_si_pid; |
| 171 | to->si_uid = from->cpt_si_uid; |
| 172 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 173 | } |
| 174 | else |
| 175 | { |
| 176 | switch (to->si_signo) |
| 177 | { |
| 178 | case SIGCHLD: |
| 179 | to->si_pid = from->cpt_si_pid; |
| 180 | to->si_uid = from->cpt_si_uid; |
| 181 | to->si_status = from->cpt_si_status; |
| 182 | to->si_utime = from->cpt_si_utime; |
| 183 | to->si_stime = from->cpt_si_stime; |
| 184 | break; |
| 185 | case SIGILL: |
| 186 | case SIGFPE: |
| 187 | case SIGSEGV: |
| 188 | case SIGBUS: |
| 189 | to->si_addr = (void *) (intptr_t) from->cpt_si_addr; |
| 190 | break; |
| 191 | case SIGPOLL: |
| 192 | to->si_band = from->cpt_si_band; |
| 193 | to->si_fd = from->cpt_si_fd; |
| 194 | break; |
| 195 | default: |
| 196 | to->si_pid = from->cpt_si_pid; |
| 197 | to->si_uid = from->cpt_si_uid; |
| 198 | to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; |
| 199 | break; |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /* Called by libthread_db. Returns a pointer to the thread local |
| 205 | storage (or its descriptor). */ |
| 206 | |
| 207 | ps_err_e |
| 208 | aarch64_ps_get_thread_area (struct ps_prochandle *ph, |
| 209 | lwpid_t lwpid, int idx, void **base, |
| 210 | int is_64bit_p) |
| 211 | { |
| 212 | struct iovec iovec; |
| 213 | uint64_t reg64; |
| 214 | uint32_t reg32; |
| 215 | |
| 216 | if (is_64bit_p) |
| 217 | { |
| 218 | iovec.iov_base = ®64; |
| 219 | iovec.iov_len = sizeof (reg64); |
| 220 | } |
| 221 | else |
| 222 | { |
| 223 | iovec.iov_base = ®32; |
| 224 | iovec.iov_len = sizeof (reg32); |
| 225 | } |
| 226 | |
| 227 | if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0) |
| 228 | return PS_ERR; |
| 229 | |
| 230 | /* IDX is the bias from the thread pointer to the beginning of the |
| 231 | thread descriptor. It has to be subtracted due to implementation |
| 232 | quirks in libthread_db. */ |
| 233 | if (is_64bit_p) |
| 234 | *base = (void *) (reg64 - idx); |
| 235 | else |
| 236 | *base = (void *) (uintptr_t) (reg32 - idx); |
| 237 | |
| 238 | return PS_OK; |
| 239 | } |