253 lines
6.6 KiB
C
253 lines
6.6 KiB
C
/* Copyright (C) 2009-2020 Free Software Foundation, Inc.
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Contributed by ARM Ltd.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "gdbsupport/common-defs.h"
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#include "gdbsupport/break-common.h"
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#include "nat/linux-nat.h"
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#include "nat/aarch64-linux-hw-point.h"
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#include "nat/aarch64-linux.h"
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#include "elf/common.h"
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#include "nat/gdb_ptrace.h"
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#include <asm/ptrace.h>
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#include <sys/uio.h>
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/* Called when resuming a thread LWP.
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The hardware debug registers are updated when there is any change. */
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void
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aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
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{
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struct arch_lwp_info *info = lwp_arch_private_info (lwp);
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/* NULL means this is the main thread still going through the shell,
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or, no watchpoint has been set yet. In that case, there's
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nothing to do. */
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if (info == NULL)
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return;
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if (DR_HAS_CHANGED (info->dr_changed_bp)
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|| DR_HAS_CHANGED (info->dr_changed_wp))
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{
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ptid_t ptid = ptid_of_lwp (lwp);
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int tid = ptid.lwp ();
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struct aarch64_debug_reg_state *state
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= aarch64_get_debug_reg_state (ptid.pid ());
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if (show_debug_regs)
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debug_printf ("prepare_to_resume thread %d\n", tid);
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/* Watchpoints. */
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if (DR_HAS_CHANGED (info->dr_changed_wp))
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{
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aarch64_linux_set_debug_regs (state, tid, 1);
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DR_CLEAR_CHANGED (info->dr_changed_wp);
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}
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/* Breakpoints. */
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if (DR_HAS_CHANGED (info->dr_changed_bp))
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{
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aarch64_linux_set_debug_regs (state, tid, 0);
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DR_CLEAR_CHANGED (info->dr_changed_bp);
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}
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}
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}
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/* Function to call when a new thread is detected. */
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void
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aarch64_linux_new_thread (struct lwp_info *lwp)
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{
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ptid_t ptid = ptid_of_lwp (lwp);
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struct aarch64_debug_reg_state *state
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= aarch64_get_debug_reg_state (ptid.pid ());
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struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
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/* If there are hardware breakpoints/watchpoints in the process then mark that
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all the hardware breakpoint/watchpoint register pairs for this thread need
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to be initialized (with data from aarch_process_info.debug_reg_state). */
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if (aarch64_linux_any_set_debug_regs_state (state, false))
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DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
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if (aarch64_linux_any_set_debug_regs_state (state, true))
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DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
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lwp_set_arch_private_info (lwp, info);
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}
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/* See nat/aarch64-linux.h. */
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void
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aarch64_linux_delete_thread (struct arch_lwp_info *arch_lwp)
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{
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xfree (arch_lwp);
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}
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/* Convert native siginfo FROM to the siginfo in the layout of the
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inferior's architecture TO. */
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void
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aarch64_compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
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{
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memset (to, 0, sizeof (*to));
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to->si_signo = from->si_signo;
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to->si_errno = from->si_errno;
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to->si_code = from->si_code;
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if (to->si_code == SI_TIMER)
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{
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to->cpt_si_timerid = from->si_timerid;
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to->cpt_si_overrun = from->si_overrun;
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to->cpt_si_ptr = (intptr_t) from->si_ptr;
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}
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else if (to->si_code == SI_USER)
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{
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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}
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else if (to->si_code < 0)
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{
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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to->cpt_si_ptr = (intptr_t) from->si_ptr;
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}
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else
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{
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switch (to->si_signo)
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{
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case SIGCHLD:
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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to->cpt_si_status = from->si_status;
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to->cpt_si_utime = from->si_utime;
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to->cpt_si_stime = from->si_stime;
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
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to->cpt_si_addr = (intptr_t) from->si_addr;
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break;
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case SIGPOLL:
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to->cpt_si_band = from->si_band;
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to->cpt_si_fd = from->si_fd;
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break;
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default:
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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to->cpt_si_ptr = (intptr_t) from->si_ptr;
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break;
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}
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}
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}
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/* Convert inferior's architecture siginfo FROM to native siginfo TO. */
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void
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aarch64_siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
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{
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memset (to, 0, sizeof (*to));
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to->si_signo = from->si_signo;
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to->si_errno = from->si_errno;
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to->si_code = from->si_code;
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if (to->si_code == SI_TIMER)
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{
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to->si_timerid = from->cpt_si_timerid;
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to->si_overrun = from->cpt_si_overrun;
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to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
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}
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else if (to->si_code == SI_USER)
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{
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to->si_pid = from->cpt_si_pid;
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to->si_uid = from->cpt_si_uid;
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}
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if (to->si_code < 0)
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{
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to->si_pid = from->cpt_si_pid;
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to->si_uid = from->cpt_si_uid;
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to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
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}
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else
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{
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switch (to->si_signo)
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{
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case SIGCHLD:
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to->si_pid = from->cpt_si_pid;
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to->si_uid = from->cpt_si_uid;
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to->si_status = from->cpt_si_status;
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to->si_utime = from->cpt_si_utime;
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to->si_stime = from->cpt_si_stime;
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
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to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
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break;
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case SIGPOLL:
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to->si_band = from->cpt_si_band;
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to->si_fd = from->cpt_si_fd;
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break;
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default:
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to->si_pid = from->cpt_si_pid;
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to->si_uid = from->cpt_si_uid;
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to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
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break;
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}
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}
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}
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/* Called by libthread_db. Returns a pointer to the thread local
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storage (or its descriptor). */
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ps_err_e
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aarch64_ps_get_thread_area (struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base,
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int is_64bit_p)
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{
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struct iovec iovec;
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uint64_t reg64;
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uint32_t reg32;
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if (is_64bit_p)
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{
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iovec.iov_base = ®64;
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iovec.iov_len = sizeof (reg64);
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}
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else
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{
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iovec.iov_base = ®32;
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iovec.iov_len = sizeof (reg32);
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}
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if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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if (is_64bit_p)
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*base = (void *) (reg64 - idx);
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else
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*base = (void *) (uintptr_t) (reg32 - idx);
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return PS_OK;
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}
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