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/* Copyright (C) 2009-2022 Free Software Foundation, Inc.
Contributed by ARM Ltd.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "gdbsupport/common-defs.h"
#include "gdbsupport/break-common.h"
#include "nat/linux-nat.h"
#include "nat/aarch64-linux-hw-point.h"
#include "nat/aarch64-linux.h"
#include "elf/common.h"
#include "nat/gdb_ptrace.h"
#include <asm/ptrace.h>
#include <sys/uio.h>
/* Called when resuming a thread LWP.
The hardware debug registers are updated when there is any change. */
void
aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
{
struct arch_lwp_info *info = lwp_arch_private_info (lwp);
/* NULL means this is the main thread still going through the shell,
or, no watchpoint has been set yet. In that case, there's
nothing to do. */
if (info == NULL)
return;
if (DR_HAS_CHANGED (info->dr_changed_bp)
|| DR_HAS_CHANGED (info->dr_changed_wp))
{
ptid_t ptid = ptid_of_lwp (lwp);
int tid = ptid.lwp ();
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (ptid.pid ());
if (show_debug_regs)
debug_printf ("prepare_to_resume thread %d\n", tid);
/* Watchpoints. */
if (DR_HAS_CHANGED (info->dr_changed_wp))
{
aarch64_linux_set_debug_regs (state, tid, 1);
DR_CLEAR_CHANGED (info->dr_changed_wp);
}
/* Breakpoints. */
if (DR_HAS_CHANGED (info->dr_changed_bp))
{
aarch64_linux_set_debug_regs (state, tid, 0);
DR_CLEAR_CHANGED (info->dr_changed_bp);
}
}
}
/* Function to call when a new thread is detected. */
void
aarch64_linux_new_thread (struct lwp_info *lwp)
{
ptid_t ptid = ptid_of_lwp (lwp);
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (ptid.pid ());
struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
/* If there are hardware breakpoints/watchpoints in the process then mark that
all the hardware breakpoint/watchpoint register pairs for this thread need
to be initialized (with data from aarch_process_info.debug_reg_state). */
if (aarch64_linux_any_set_debug_regs_state (state, false))
DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
if (aarch64_linux_any_set_debug_regs_state (state, true))
DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
lwp_set_arch_private_info (lwp, info);
}
/* See nat/aarch64-linux.h. */
void
aarch64_linux_delete_thread (struct arch_lwp_info *arch_lwp)
{
xfree (arch_lwp);
}
/* Convert native siginfo FROM to the siginfo in the layout of the
inferior's architecture TO. */
void
aarch64_compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->cpt_si_timerid = from->si_timerid;
to->cpt_si_overrun = from->si_overrun;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else if (to->si_code == SI_USER)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
}
else if (to->si_code < 0)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_status = from->si_status;
to->cpt_si_utime = from->si_utime;
to->cpt_si_stime = from->si_stime;
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->cpt_si_addr = (intptr_t) from->si_addr;
break;
case SIGPOLL:
to->cpt_si_band = from->si_band;
to->cpt_si_fd = from->si_fd;
break;
default:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
break;
}
}
}
/* Convert inferior's architecture siginfo FROM to native siginfo TO. */
void
aarch64_siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->si_timerid = from->cpt_si_timerid;
to->si_overrun = from->cpt_si_overrun;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else if (to->si_code == SI_USER)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
}
if (to->si_code < 0)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_status = from->cpt_si_status;
to->si_utime = from->cpt_si_utime;
to->si_stime = from->cpt_si_stime;
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
break;
case SIGPOLL:
to->si_band = from->cpt_si_band;
to->si_fd = from->cpt_si_fd;
break;
default:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
break;
}
}
}
/* Called by libthread_db. Returns a pointer to the thread local
storage (or its descriptor). */
ps_err_e
aarch64_ps_get_thread_area (struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base,
int is_64bit_p)
{
struct iovec iovec;
uint64_t reg64;
uint32_t reg32;
if (is_64bit_p)
{
iovec.iov_base = ®64;
iovec.iov_len = sizeof (reg64);
}
else
{
iovec.iov_base = ®32;
iovec.iov_len = sizeof (reg32);
}
if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0)
return PS_ERR;
/* IDX is the bias from the thread pointer to the beginning of the
thread descriptor. It has to be subtracted due to implementation
quirks in libthread_db. */
if (is_64bit_p)
*base = (void *) (reg64 - idx);
else
*base = (void *) (uintptr_t) (reg32 - idx);
return PS_OK;
}
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