[PATCH v2 10/10] Add minimal and functional NetBSD/amd64 gdbserver

Kamil Rytarowski
2020-09-04T00:30:07Z

Implement the following functionality: create_inferior,
post_create_inferior, attach, kill, detach, mourn, join, thread_alive,
resume, wait, fetch_registers, store_registers, read_memory, write_memory,
request_interrupt, supports_read_auxv, read_auxv,
supports_hardware_single_step, sw_breakpoint_from_kind,
supports_z_point_type, insert_point, remove_point,
stopped_by_sw_breakpoint, supports_qxfer_siginfo, qxfer_siginfo,
supports_stopped_by_sw_breakpoint, supports_non_stop,
supports_multi_process, supports_fork_events, supports_vfork_events,
supports_exec_events, supports_disable_randomization,
supports_qxfer_libraries_svr4, qxfer_libraries_svr4,
supports_pid_to_exec_file, pid_to_exec_file, thread_name,
supports_catch_syscall.

The only CPU architecture supported: x86_64.

Implement only support for hardware assisted single step and
software breakpoint.

Implement support only for regular X86 registers, thus no FPU.

gdbserver/ChangeLog:

* netbsd-low.cc: Add.
* netbsd-low.h: Likewise.
* netbsd-x86_64-low.cc: Likewise.
* Makefile.in (SFILES): Register "netbsd-low.cc", "netbsd-low.h",
"netbsd-x86_64-low.cc".
* configure.srv: Add x86_64-*-netbsd*.
---
gdbserver/ChangeLog | 9 +
gdbserver/Makefile.in | 3 +
gdbserver/configure.srv | 6 +
gdbserver/netbsd-low.cc | 1348 ++++++++++++++++++++++++++++++++
gdbserver/netbsd-low.h | 154 ++++
gdbserver/netbsd-x86_64-low.cc | 187 +++++
6 files changed, 1707 insertions(+)
create mode 100644 gdbserver/netbsd-low.cc
create mode 100644 gdbserver/netbsd-low.h
create mode 100644 gdbserver/netbsd-x86_64-low.cc

diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog
index e437493b56d..022d0bbfee6 100644
--- a/gdbserver/ChangeLog
+++ b/gdbserver/ChangeLog
@@ -1,3 +1,12 @@
+2020-09-04 Kamil Rytarowski <n54@gmx.com>
+
+ * netbsd-low.cc: Add.
+ * netbsd-low.h: Likewise.
+ * netbsd-x86_64-low.cc: Likewise.
+ * Makefile.in (SFILES): Register "netbsd-low.cc", "netbsd-low.h",
+ "netbsd-x86_64-low.cc".
+ * configure.srv: Add x86_64-*-netbsd*.
+
2020-08-13 Simon Marchi <simon.marchi@polymtl.ca>

* server.cc (captured_main): Accept multiple `--selftest=`
diff --git a/gdbserver/Makefile.in b/gdbserver/Makefile.in
index 9d7687be534..1d597b14523 100644
--- a/gdbserver/Makefile.in
+++ b/gdbserver/Makefile.in
@@ -193,6 +193,9 @@ SFILES = \
$(srcdir)/linux-x86-low.cc \
$(srcdir)/linux-xtensa-low.cc \
$(srcdir)/mem-break.cc \
+ $(srcdir)/netbsd-low.cc \
+ $(srcdir)/netbsd-low.h \
+ $(srcdir)/netbsd-x86_64-low.cc \
$(srcdir)/proc-service.cc \
$(srcdir)/proc-service.list \
$(srcdir)/regcache.cc \
diff --git a/gdbserver/configure.srv b/gdbserver/configure.srv
index 5e33bd9c54d..5ac4b8f809e 100644
--- a/gdbserver/configure.srv
+++ b/gdbserver/configure.srv
@@ -349,6 +349,12 @@ case "${gdbserver_host}" in
srv_tgtobj="${srv_tgtobj} nat/windows-nat.o"
srv_tgtobj="${srv_tgtobj} arch/amd64.o arch/i386.o"
;;
+ x86_64-*-netbsd*) srv_regobj=""
+ srv_tgtobj="netbsd-low.o netbsd-x86_64-low.o fork-child.o"
+ srv_tgtobj="${srv_tgtobj} nat/fork-inferior.o"
+ srv_tgtobj="${srv_tgtobj} nat/netbsd-nat.o"
+ srv_tgtobj="${srv_tgtobj} arch/amd64.o"
+ ;;

xtensa*-*-linux*) srv_regobj=reg-xtensa.o
srv_tgtobj="$srv_linux_obj linux-xtensa-low.o"
diff --git a/gdbserver/netbsd-low.cc b/gdbserver/netbsd-low.cc
new file mode 100644
index 00000000000..27006615e7b
--- /dev/null
+++ b/gdbserver/netbsd-low.cc
@@ -0,0 +1,1348 @@
+/* Copyright (C) 2020 Free Software Foundation, Inc.
+
+ 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 "server.h"
+#include "target.h"
+#include "netbsd-low.h"
+#include "nat/netbsd-nat.h"
+
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include <sys/ptrace.h>
+#include <sys/sysctl.h>
+
+#include <limits.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <elf.h>
+
+#include <type_traits>
+
+#include "gdbsupport/eintr.h"
+#include "gdbsupport/gdb_wait.h"
+#include "gdbsupport/filestuff.h"
+#include "gdbsupport/common-inferior.h"
+#include "nat/fork-inferior.h"
+#include "hostio.h"
+
+int using_threads = 1;
+
+const struct target_desc *netbsd_tdesc;
+
+/* Call add_process with the given parameters, and initialize
+ the process' private data. */
+
+static void
+netbsd_add_process (int pid, int attached)
+{
+ struct process_info *proc = add_process (pid, attached);
+ proc->tdesc = netbsd_tdesc;
+ proc->priv = nullptr;
+}
+
+/* Callback used by fork_inferior to start tracing the inferior. */
+
+static void
+netbsd_ptrace_fun ()
+{
+ /* Switch child to its own process group so that signals won't
+ directly affect GDBserver. */
+ if (setpgid (0, 0) < 0)
+ trace_start_error_with_name (("setpgid"));
+
+ if (ptrace (PT_TRACE_ME, 0, nullptr, 0) < 0)
+ trace_start_error_with_name (("ptrace"));
+
+ /* If GDBserver is connected to gdb via stdio, redirect the inferior's
+ stdout to stderr so that inferior i/o doesn't corrupt the connection.
+ Also, redirect stdin to /dev/null. */
+ if (remote_connection_is_stdio ())
+ {
+ if (close (0) < 0)
+ trace_start_error_with_name (("close"));
+ if (open ("/dev/null", O_RDONLY) < 0)
+ trace_start_error_with_name (("open"));
+ if (dup2 (2, 1) < 0)
+ trace_start_error_with_name (("dup2"));
+ if (write (2, "stdin/stdout redirected\n",
+ sizeof ("stdin/stdout redirected\n") - 1) < 0)
+ {
+ /* Errors ignored. */
+ }
+ }
+}
+
+/* Register threads in the process specified by PID. */
+
+static void
+netbsd_add_threads (pid_t pid)
+{
+ auto fn
+ = [] (ptid_t ptid)
+ {
+ add_thread (ptid, nullptr);
+ };
+
+ netbsd_nat::for_each_thread (pid, fn);
+}
+
+/* Implement the create_inferior method of the target_ops vector. */
+
+int
+netbsd_process_target::create_inferior (const char *program,
+ const std::vector<char *> &program_args)
+{
+ std::string str_program_args = construct_inferior_arguments (program_args);
+
+ pid_t pid = fork_inferior (program, str_program_args.c_str (),
+ get_environ ()->envp (), netbsd_ptrace_fun,
+ nullptr, nullptr, nullptr, nullptr);
+
+ netbsd_add_process (pid, 0);
+
+ post_fork_inferior (pid, program);
+
+ return pid;
+}
+
+/* Implement the post_create_inferior target_ops method. */
+
+void
+netbsd_process_target::post_create_inferior ()
+{
+ pid_t pid = current_process ()->pid;
+ netbsd_nat::enable_proc_events (pid);
+}
+
+/* Implement the attach target_ops method. */
+
+int
+netbsd_process_target::attach (unsigned long pid)
+{
+
+ if (ptrace (PT_ATTACH, pid, nullptr, 0) != 0)
+ error ("Cannot attach to process %lu: %s (%d)\n", pid,
+ safe_strerror (errno), errno);
+
+ netbsd_add_process (pid, 1);
+ netbsd_nat::enable_proc_events (pid);
+ netbsd_add_threads (pid);
+
+ return 0;
+}
+
+/* Returns true if GDB is interested in any child syscalls. */
+
+static bool
+gdb_catching_syscalls_p (pid_t pid)
+{
+ struct process_info *proc = find_process_pid (pid);
+ return !proc->syscalls_to_catch.empty ();
+}
+
+/* Implement the resume target_ops method. */
+
+void
+netbsd_process_target::resume (struct thread_resume *resume_info, size_t n)
+{
+ ptid_t resume_ptid = resume_info[0].thread;
+ const int signal = resume_info[0].sig;
+ const bool step = resume_info[0].kind == resume_step;
+
+ if (resume_ptid == minus_one_ptid)
+ resume_ptid = ptid_of (current_thread);
+
+ const pid_t pid = resume_ptid.pid ();
+ const lwpid_t lwp = resume_ptid.lwp ();
+ regcache_invalidate_pid (pid);
+
+ auto fn
+ = [&] (ptid_t ptid)
+ {
+ if (step)
+ {
+ if (ptid.lwp () == lwp || n != 1)
+ {
+ if (ptrace (PT_SETSTEP, pid, NULL, ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ if (ptrace (PT_RESUME, pid, NULL, ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+ else
+ {
+ if (ptrace (PT_CLEARSTEP, pid, NULL, ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ if (ptrace (PT_SUSPEND, pid, NULL, ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+ }
+ else
+ {
+ if (ptrace (PT_CLEARSTEP, pid, NULL, ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ if (ptrace (PT_RESUME, pid, NULL, ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+ };
+
+ netbsd_nat::for_each_thread (pid, fn);
+
+ int request = gdb_catching_syscalls_p (pid) ? PT_CONTINUE : PT_SYSCALL;
+
+ errno = 0;
+ ptrace (request, pid, (void *)1, signal);
+ if (errno)
+ perror_with_name (("ptrace"));
+}
+
+/* Returns true if GDB is interested in the reported SYSNO syscall. */
+
+static bool
+netbsd_catch_this_syscall (int sysno)
+{
+ struct process_info *proc = current_process ();
+
+ if (proc->syscalls_to_catch.empty ())
+ return false;
+
+ if (proc->syscalls_to_catch[0] == ANY_SYSCALL)
+ return true;
+
+ for (int iter : proc->syscalls_to_catch)
+ if (iter == sysno)
+ return true;
+
+ return false;
+}
+
+/* Helper function for child_wait and the derivatives of child_wait.
+ HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
+ translation of that in OURSTATUS. */
+
+static void
+netbsd_store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus)
+{
+ if (WIFEXITED (hoststatus))
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXITED;
+ ourstatus->value.integer = WEXITSTATUS (hoststatus);
+ }
+ else if (!WIFSTOPPED (hoststatus))
+ {
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus));
+ }
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_STOPPED;
+ ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus));
+ }
+}
+
+/* Implement a safe wrapper around waitpid(). */
+
+static pid_t
+netbsd_waitpid (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
+{
+ int status;
+
+ pid_t pid
+ = gdb::handle_eintr<int> (-1, ::waitpid, ptid.pid (), &status, options);
+
+ if (pid == -1)
+ perror_with_name (_("Child process unexpectedly missing"));
+
+ netbsd_store_waitstatus (ourstatus, status);
+ return pid;
+}
+
+
+/* Implement the wait target_ops method.
+
+ Wait for the child specified by PTID to do something. Return the
+ process ID of the child, or MINUS_ONE_PTID in case of error; store
+ the status in *OURSTATUS. */
+
+static ptid_t
+netbsd_wait (ptid_t ptid, struct target_waitstatus *ourstatus,
+ int target_options)
+{
+ pid_t pid = netbsd_waitpid (ptid, ourstatus, target_options);
+ ptid_t wptid = ptid_t (pid);
+
+ if (pid == 0)
+ {
+ gdb_assert (target_options & TARGET_WNOHANG);
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+ return null_ptid;
+ }
+
+ gdb_assert (pid != -1);
+
+ /* If the child stopped, keep investigating its status. */
+ if (ourstatus->kind != TARGET_WAITKIND_STOPPED)
+ return wptid;
+
+ /* Extract the event and thread that received a signal. */
+ ptrace_siginfo_t psi;
+ if (ptrace (PT_GET_SIGINFO, pid, &psi, sizeof (psi)) == -1)
+ perror_with_name (("ptrace"));
+
+ /* Pick child's siginfo_t. */
+ siginfo_t *si = &psi.psi_siginfo;
+
+ lwpid_t lwp = psi.psi_lwpid;
+
+ int signo = si->si_signo;
+ const int code = si->si_code;
+
+ /* Construct PTID with a specified thread that received the event.
+ If a signal was targeted to the whole process, lwp is 0. */
+ wptid = ptid_t (pid, lwp, 0);
+
+ /* Bail out on non-debugger oriented signals. */
+ if (signo != SIGTRAP)
+ return wptid;
+
+ /* Stop examining non-debugger oriented SIGTRAP codes. */
+ if (code <= SI_USER || code == SI_NOINFO)
+ return wptid;
+
+ /* Process state for threading events. */
+ ptrace_state_t pst = {};
+ if (code == TRAP_LWP)
+ if (ptrace (PT_GET_PROCESS_STATE, pid, &pst, sizeof (pst)) == -1)
+ perror_with_name (("ptrace"));
+
+ if (code == TRAP_LWP && pst.pe_report_event == PTRACE_LWP_EXIT)
+ {
+ /* If GDB attaches to a multi-threaded process, exiting
+ threads might be skipped during post_attach that
+ have not yet reported their PTRACE_LWP_EXIT event.
+ Ignore exited events for an unknown LWP. */
+ thread_info *thr = find_thread_ptid (wptid);
+ if (thr == nullptr)
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED;
+ /* NetBSD does not store an LWP exit status. */
+ ourstatus->value.integer = 0;
+
+ remove_thread (thr);
+ }
+ return wptid;
+ }
+
+ if (find_thread_ptid (ptid_t (pid)))
+ current_thread = find_thread_ptid (wptid);
+
+ if (code == TRAP_LWP && pst.pe_report_event == PTRACE_LWP_CREATE)
+ {
+ /* If GDB attaches to a multi-threaded process, newborn
+ threads might be added by nbsd_add_threads that have
+ not yet reported their PTRACE_LWP_CREATE event. Ignore
+ born events for an already-known LWP. */
+ if (find_thread_ptid (wptid))
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ else
+ {
+ add_thread (wptid, NULL);
+ ourstatus->kind = TARGET_WAITKIND_THREAD_CREATED;
+ }
+ return wptid;
+ }
+
+ if (code == TRAP_EXEC)
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXECD;
+ ourstatus->value.execd_pathname
+ = xstrdup (netbsd_nat::pid_to_exec_file (pid));
+ return wptid;
+ }
+
+ if (code == TRAP_TRACE)
+ return wptid;
+
+ if (code == TRAP_SCE || code == TRAP_SCX)
+ {
+ int sysnum = si->si_sysnum;
+
+ if (!netbsd_catch_this_syscall(sysnum))
+ {
+ /* If the core isn't interested in this event, ignore it. */
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ return wptid;
+ }
+
+ ourstatus->kind
+ = ((code == TRAP_SCE) ? TARGET_WAITKIND_SYSCALL_ENTRY :
+ TARGET_WAITKIND_SYSCALL_RETURN);
+ ourstatus->value.syscall_number = sysnum;
+ return wptid;
+ }
+
+ if (code == TRAP_BRKPT)
+ {
+#ifdef PTRACE_BREAKPOINT_ADJ
+ CORE_ADDR pc;
+ struct reg r;
+ ptrace (PT_GETREGS, pid, &r, psi.psi_lwpid);
+ pc = PTRACE_REG_PC (&r);
+ PTRACE_REG_SET_PC (&r, pc - PTRACE_BREAKPOINT_ADJ);
+ ptrace (PT_SETREGS, pid, &r, psi.psi_lwpid);
+#endif
+ return wptid;
+ }
+
+ /* Unclassified SIGTRAP event. */
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ return wptid;
+}
+
+/* Implement the wait target_ops method. */
+
+ptid_t
+netbsd_process_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
+ int target_options)
+{
+ while (true)
+ {
+ ptid_t wptid = netbsd_wait (ptid, ourstatus, target_options);
+
+ /* Register thread in the gdbcore if a thread was not reported earlier.
+ This is required after ::create_inferior, when the gdbcore does not
+ know about the first internal thread.
+ This may also happen on attach, when an event is registered on a thread
+ that was not fully initialized during the attach stage. */
+ if (wptid.lwp () != 0 && !find_thread_ptid (wptid)
+ && ourstatus->kind != TARGET_WAITKIND_THREAD_EXITED)
+ add_thread (wptid, nullptr);
+
+ switch (ourstatus->kind)
+ {
+ case TARGET_WAITKIND_EXITED:
+ case TARGET_WAITKIND_STOPPED:
+ case TARGET_WAITKIND_SIGNALLED:
+ case TARGET_WAITKIND_FORKED:
+ case TARGET_WAITKIND_VFORKED:
+ case TARGET_WAITKIND_EXECD:
+ case TARGET_WAITKIND_VFORK_DONE:
+ case TARGET_WAITKIND_SYSCALL_ENTRY:
+ case TARGET_WAITKIND_SYSCALL_RETURN:
+ /* Pass the result to the generic code. */
+ return wptid;
+ case TARGET_WAITKIND_THREAD_CREATED:
+ case TARGET_WAITKIND_THREAD_EXITED:
+ /* The core needlessly stops on these events. */
+ /* FALLTHROUGH */
+ case TARGET_WAITKIND_SPURIOUS:
+ /* Spurious events are unhandled by the gdbserver core. */
+ if (ptrace (PT_CONTINUE, current_process ()->pid, (void *) 1, 0)
+ == -1)
+ perror_with_name (("ptrace"));
+ break;
+ default:
+ error (("Unknown stopped status"));
+ }
+ }
+}
+
+/* Implement the kill target_ops method. */
+
+int
+netbsd_process_target::kill (process_info *process)
+{
+ pid_t pid = process->pid;
+ if (ptrace (PT_KILL, pid, nullptr, 0) == -1)
+ return -1;
+
+ int status;
+ if (gdb::handle_eintr<int> (-1, ::waitpid, pid, &status, 0) == -1)
+ return -1;
+ mourn (process);
+ return 0;
+}
+
+/* Implement the detach target_ops method. */
+
+int
+netbsd_process_target::detach (process_info *process)
+{
+ pid_t pid = process->pid;
+
+ ptrace (PT_DETACH, pid, (void *) 1, 0);
+ mourn (process);
+ return 0;
+}
+
+/* Implement the mourn target_ops method. */
+
+void
+netbsd_process_target::mourn (struct process_info *proc)
+{
+ for_each_thread (proc->pid, remove_thread);
+
+ remove_process (proc);
+}
+
+/* Implement the join target_ops method. */
+
+void
+netbsd_process_target::join (int pid)
+{
+ /* The PT_DETACH is sufficient to detach from the process.
+ So no need to do anything extra. */
+}
+
+/* Implement the thread_alive target_ops method. */
+
+bool
+netbsd_process_target::thread_alive (ptid_t ptid)
+{
+ return netbsd_nat::thread_alive (ptid);
+}
+
+/* Implement the fetch_registers target_ops method. */
+
+void
+netbsd_process_target::fetch_registers (struct regcache *regcache, int regno)
+{
+ struct netbsd_regset_info *regset = netbsd_target_regsets;
+ ptid_t inferior_ptid = ptid_of (current_thread);
+
+ while (regset->size >= 0)
+ {
+ char *buf = (char *) xmalloc (regset->size);
+ int res = ptrace (regset->get_request, inferior_ptid.pid (), buf,
+ inferior_ptid.lwp ());
+ if (res == -1)
+ perror_with_name (("ptrace"));
+ regset->store_function (regcache, buf);
+ free (buf);
+ regset++;
+ }
+}
+
+/* Implement the store_registers target_ops method. */
+
+void
+netbsd_process_target::store_registers (struct regcache *regcache, int regno)
+{
+ struct netbsd_regset_info *regset = netbsd_target_regsets;
+ ptid_t inferior_ptid = ptid_of (current_thread);
+
+ while (regset->size >= 0)
+ {
+ char *buf = (char *)xmalloc (regset->size);
+ int res = ptrace (regset->get_request, inferior_ptid.pid (), buf,
+ inferior_ptid.lwp ());
+ if (res == -1)
+ perror_with_name (("ptrace"));
+ if (res == 0)
+ {
+ /* Then overlay our cached registers on that. */
+ regset->fill_function (regcache, buf);
+ /* Only now do we write the register set. */
+ res = ptrace (regset->set_request, inferior_ptid.pid (), buf,
+ inferior_ptid.lwp ());
+ }
+ free (buf);
+ regset++;
+ }
+}
+
+/* Implement the read_memory target_ops method. */
+
+int
+netbsd_process_target::read_memory (CORE_ADDR memaddr, unsigned char *myaddr,
+ int size)
+{
+ struct ptrace_io_desc io;
+ io.piod_op = PIOD_READ_D;
+ io.piod_len = size;
+
+ pid_t pid = current_process ()->pid;
+
+ int bytes_read = 0;
+
+ if (size == 0)
+ {
+ /* Zero length write always succeeds. */
+ return 0;
+ }
+ do
+ {
+ io.piod_offs = (void *)(memaddr + bytes_read);
+ io.piod_addr = myaddr + bytes_read;
+
+ int rv = ptrace (PT_IO, pid, &io, 0);
+ if (rv == -1)
+ return errno;
+ if (io.piod_len == 0)
+ return 0;
+
+ bytes_read += io.piod_len;
+ io.piod_len = size - bytes_read;
+ }
+ while (bytes_read < size);
+
+ return 0;
+}
+
+/* Implement the write_memory target_ops method. */
+
+int
+netbsd_process_target::write_memory (CORE_ADDR memaddr,
+ const unsigned char *myaddr, int size)
+{
+ struct ptrace_io_desc io;
+ io.piod_op = PIOD_WRITE_D;
+ io.piod_len = size;
+
+ pid_t pid = current_process ()->pid;
+
+ int bytes_written = 0;
+
+ if (size == 0)
+ {
+ /* Zero length write always succeeds. */
+ return 0;
+ }
+
+ do
+ {
+ io.piod_addr = (void *)(myaddr + bytes_written);
+ io.piod_offs = (void *)(memaddr + bytes_written);
+
+ int rv = ptrace (PT_IO, pid, &io, 0);
+ if (rv == -1)
+ return errno;
+ if (io.piod_len == 0)
+ return 0;
+
+ bytes_written += io.piod_len;
+ io.piod_len = size - bytes_written;
+ }
+ while (bytes_written < size);
+
+ return 0;
+}
+
+/* Implement the request_interrupt target_ops method. */
+
+void
+netbsd_process_target::request_interrupt ()
+{
+ ptid_t inferior_ptid = ptid_of (get_first_thread ());
+
+ ::kill (inferior_ptid.pid(), SIGINT);
+}
+
+/* Read the AUX Vector for the specified PID, wrapping the ptrace(2) call
+ with the PIOD_READ_AUXV operation and using the PT_IO standard input
+ and output arguments. */
+
+static size_t
+netbsd_read_auxv(pid_t pid, void *offs, void *addr, size_t len)
+{
+ struct ptrace_io_desc pio;
+
+ pio.piod_op = PIOD_READ_AUXV;
+ pio.piod_offs = offs;
+ pio.piod_addr = addr;
+ pio.piod_len = len;
+
+ if (ptrace (PT_IO, pid, &pio, 0) == -1)
+ perror_with_name (("ptrace"));
+
+ return pio.piod_len;
+}
+
+/* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
+ to debugger memory starting at MYADDR. */
+
+int
+netbsd_process_target::read_auxv (CORE_ADDR offset,
+ unsigned char *myaddr, unsigned int len)
+{
+ pid_t pid = pid_of (current_thread);
+
+ return netbsd_read_auxv (pid, (void *) (intptr_t) offset, myaddr, len);
+}
+
+bool
+netbsd_process_target::supports_z_point_type (char z_type)
+{
+ switch (z_type)
+ {
+ case Z_PACKET_SW_BP:
+ return true;
+ case Z_PACKET_HW_BP:
+ case Z_PACKET_WRITE_WP:
+ case Z_PACKET_READ_WP:
+ case Z_PACKET_ACCESS_WP:
+ default:
+ return false; /* Not supported. */
+ }
+}
+
+/* Insert {break/watch}point at address ADDR. SIZE is not used. */
+
+int
+netbsd_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp)
+{
+ switch (type)
+ {
+ case raw_bkpt_type_sw:
+ return insert_memory_breakpoint (bp);
+ case raw_bkpt_type_hw:
+ case raw_bkpt_type_write_wp:
+ case raw_bkpt_type_read_wp:
+ case raw_bkpt_type_access_wp:
+ default:
+ return 1; /* Not supported. */
+ }
+}
+
+/* Remove {break/watch}point at address ADDR. SIZE is not used. */
+
+int
+netbsd_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp)
+{
+ switch (type)
+ {
+ case raw_bkpt_type_sw:
+ return remove_memory_breakpoint (bp);
+ case raw_bkpt_type_hw:
+ case raw_bkpt_type_write_wp:
+ case raw_bkpt_type_read_wp:
+ case raw_bkpt_type_access_wp:
+ default:
+ return 1; /* Not supported. */
+ }
+}
+
+/* Implement the stopped_by_sw_breakpoint target_ops method. */
+
+bool
+netbsd_process_target::stopped_by_sw_breakpoint ()
+{
+ ptrace_siginfo_t psi;
+ pid_t pid = current_process ()->pid;
+
+ if (ptrace (PT_GET_SIGINFO, pid, &psi, sizeof (psi)) == -1)
+ perror_with_name (("ptrace"));
+
+ return psi.psi_siginfo.si_signo == SIGTRAP &&
+ psi.psi_siginfo.si_code == TRAP_BRKPT;
+}
+
+/* Implement the supports_stopped_by_sw_breakpoint target_ops method. */
+
+bool
+netbsd_process_target::supports_stopped_by_sw_breakpoint ()
+{
+ return true;
+}
+
+/* Implement the supports_qxfer_siginfo target_ops method. */
+
+bool
+netbsd_process_target::supports_qxfer_siginfo ()
+{
+ return true;
+}
+
+/* Implement the qxfer_siginfo target_ops method. */
+
+int
+netbsd_process_target::qxfer_siginfo (const char *annex, unsigned char *readbuf,
+ unsigned const char *writebuf,
+ CORE_ADDR offset, int len)
+{
+ if (current_thread == nullptr)
+ return -1;
+
+ pid_t pid = current_process ()->pid;
+
+ return netbsd_nat::qxfer_siginfo(pid, annex, readbuf, writebuf, offset, len);
+}
+
+/* Implement the supports_non_stop target_ops method. */
+
+bool
+netbsd_process_target::supports_non_stop ()
+{
+ return false;
+}
+
+/* Implement the supports_multi_process target_ops method. */
+
+bool
+netbsd_process_target::supports_multi_process ()
+{
+ return true;
+}
+
+/* Check if fork events are supported. */
+
+bool
+netbsd_process_target::supports_fork_events ()
+{
+ return false;
+}
+
+/* Check if vfork events are supported. */
+
+bool
+netbsd_process_target::supports_vfork_events ()
+{
+ return false;
+}
+
+/* Check if exec events are supported. */
+
+bool
+netbsd_process_target::supports_exec_events ()
+{
+ return true;
+}
+
+/* Implement the supports_disable_randomization target_ops method. */
+
+bool
+netbsd_process_target::supports_disable_randomization ()
+{
+ return false;
+}
+
+/* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
+
+template <typename T>
+int get_phdr_phnum_from_proc_auxv (const pid_t pid,
+ CORE_ADDR *phdr_memaddr, int *num_phdr)
+{
+ typedef typename std::conditional<sizeof(T) == sizeof(int64_t),
+ Aux64Info, Aux32Info>::type auxv_type;
+ const size_t auxv_size = sizeof (auxv_type);
+ const size_t auxv_buf_size = 128 * sizeof (auxv_type);
+
+ char *auxv_buf = (char *) xmalloc (auxv_buf_size);
+
+ netbsd_read_auxv (pid, nullptr, auxv_buf, auxv_buf_size);
+
+ *phdr_memaddr = 0;
+ *num_phdr = 0;
+
+ for (char *buf = auxv_buf; buf < (auxv_buf + auxv_buf_size); buf += auxv_size)
+ {
+ auxv_type *const aux = (auxv_type *) buf;
+
+ switch (aux->a_type)
+ {
+ case AT_PHDR:
+ *phdr_memaddr = aux->a_v;
+ break;
+ case AT_PHNUM:
+ *num_phdr = aux->a_v;
+ break;
+ }
+
+ if (*phdr_memaddr != 0 && *num_phdr != 0)
+ break;
+ }
+
+ xfree (auxv_buf);
+
+ if (*phdr_memaddr == 0 || *num_phdr == 0)
+ {
+ warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
+ "phdr_memaddr = %s, phdr_num = %d",
+ core_addr_to_string (*phdr_memaddr), *num_phdr);
+ return 2;
+ }
+
+ return 0;
+}
+
+/* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
+
+template <typename T>
+static CORE_ADDR
+get_dynamic (netbsd_process_target *target, const pid_t pid)
+{
+ typedef typename std::conditional<sizeof(T) == sizeof(int64_t),
+ Elf64_Phdr, Elf32_Phdr>::type phdr_type;
+ const int phdr_size = sizeof (phdr_type);
+
+ CORE_ADDR phdr_memaddr;
+ int num_phdr;
+ if (get_phdr_phnum_from_proc_auxv<T> (pid, &phdr_memaddr, &num_phdr))
+ return 0;
+
+ std::vector<unsigned char> phdr_buf;
+ phdr_buf.resize (num_phdr * phdr_size);
+
+ if (target->read_memory (phdr_memaddr, phdr_buf.data (), phdr_buf.size ()))
+ return 0;
+
+ /* Compute relocation: it is expected to be 0 for "regular" executables,
+ non-zero for PIE ones. */
+ CORE_ADDR relocation = -1;
+ for (int i = 0; relocation == -1 && i < num_phdr; i++)
+ {
+ phdr_type *const p = (phdr_type *) (phdr_buf.data() + i * phdr_size);
+
+ if (p->p_type == PT_PHDR)
+ relocation = phdr_memaddr - p->p_vaddr;
+ }
+
+ if (relocation == -1)
+ {
+ /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
+ any real world executables, including PIE executables, have always
+ PT_PHDR present. PT_PHDR is not present in some shared libraries or
+ in fpc (Free Pascal 2.4) binaries but neither of those have a need for
+ or present DT_DEBUG anyway (fpc binaries are statically linked).
+
+ Therefore if there exists DT_DEBUG there is always also PT_PHDR.
+
+ GDB could find RELOCATION also from AT_ENTRY - e_entry. */
+
+ return 0;
+ }
+
+ for (int i = 0; i < num_phdr; i++)
+ {
+ phdr_type *const p = (phdr_type *) (phdr_buf.data () + i * phdr_size);
+
+ if (p->p_type == PT_DYNAMIC)
+ return p->p_vaddr + relocation;
+ }
+
+ return 0;
+}
+
+/* Return &_r_debug in the inferior, or -1 if not present. Return value
+ can be 0 if the inferior does not yet have the library list initialized.
+ We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
+ DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
+
+template <typename T>
+static CORE_ADDR
+get_r_debug (netbsd_process_target *target, const int pid)
+{
+ typedef typename std::conditional<sizeof(T) == sizeof(int64_t),
+ Elf64_Dyn, Elf32_Dyn>::type dyn_type;
+ const int dyn_size = sizeof (dyn_type);
+ unsigned char buf[sizeof (dyn_type)]; /* The larger of the two. */
+ CORE_ADDR map = -1;
+
+ CORE_ADDR dynamic_memaddr = get_dynamic<T> (target, pid);
+ if (dynamic_memaddr == 0)
+ return map;
+
+ while (target->read_memory (dynamic_memaddr, buf, dyn_size) == 0)
+ {
+ dyn_type *const dyn = (dyn_type *) buf;
+#if defined DT_MIPS_RLD_MAP
+ union
+ {
+ T map;
+ unsigned char buf[sizeof (T)];
+ }
+ rld_map;
+
+ if (dyn->d_tag == DT_MIPS_RLD_MAP)
+ {
+ if (read_memory (dyn->d_un.d_val,
+ rld_map.buf, sizeof (rld_map.buf)) == 0)
+ return rld_map.map;
+ else
+ break;
+ }
+#endif /* DT_MIPS_RLD_MAP */
+
+ if (dyn->d_tag == DT_DEBUG && map == -1)
+ map = dyn->d_un.d_val;
+
+ if (dyn->d_tag == DT_NULL)
+ break;
+
+ dynamic_memaddr += dyn_size;
+ }
+
+ return map;
+}
+
+/* Read one pointer from MEMADDR in the inferior. */
+
+static int
+read_one_ptr (netbsd_process_target *target, CORE_ADDR memaddr, CORE_ADDR *ptr,
+ int ptr_size)
+{
+ /* Go through a union so this works on either big or little endian
+ hosts, when the inferior's pointer size is smaller than the size
+ of CORE_ADDR. It is assumed the inferior's endianness is the
+ same of the superior's. */
+
+ union
+ {
+ CORE_ADDR core_addr;
+ unsigned int ui;
+ unsigned char uc;
+ } addr;
+
+ int ret = target->read_memory (memaddr, &addr.uc, ptr_size);
+ if (ret == 0)
+ {
+ if (ptr_size == sizeof (CORE_ADDR))
+ *ptr = addr.core_addr;
+ else if (ptr_size == sizeof (unsigned int))
+ *ptr = addr.ui;
+ else
+ gdb_assert_not_reached ("unhandled pointer size");
+ }
+ return ret;
+}
+
+/* Construct qXfer:libraries-svr4:read reply. */
+
+template <typename T>
+int
+netbsd_qxfer_libraries_svr4 (netbsd_process_target *target,
+ const pid_t pid, const char *annex,
+ unsigned char *readbuf,
+ unsigned const char *writebuf,
+ CORE_ADDR offset, int len)
+{
+ struct link_map_offsets
+ {
+ /* Offset and size of r_debug.r_version. */
+ int r_version_offset;
+
+ /* Offset and size of r_debug.r_map. */
+ int r_map_offset;
+
+ /* Offset to l_addr field in struct link_map. */
+ int l_addr_offset;
+
+ /* Offset to l_name field in struct link_map. */
+ int l_name_offset;
+
+ /* Offset to l_ld field in struct link_map. */
+ int l_ld_offset;
+
+ /* Offset to l_next field in struct link_map. */
+ int l_next_offset;
+
+ /* Offset to l_prev field in struct link_map. */
+ int l_prev_offset;
+ };
+
+ static const struct link_map_offsets lmo_32bit_offsets =
+ {
+ 0, /* r_version offset. */
+ 4, /* r_debug.r_map offset. */
+ 0, /* l_addr offset in link_map. */
+ 4, /* l_name offset in link_map. */
+ 8, /* l_ld offset in link_map. */
+ 12, /* l_next offset in link_map. */
+ 16 /* l_prev offset in link_map. */
+ };
+
+ static const struct link_map_offsets lmo_64bit_offsets =
+ {
+ 0, /* r_version offset. */
+ 8, /* r_debug.r_map offset. */
+ 0, /* l_addr offset in link_map. */
+ 8, /* l_name offset in link_map. */
+ 16, /* l_ld offset in link_map. */
+ 24, /* l_next offset in link_map. */
+ 32 /* l_prev offset in link_map. */
+ };
+
+ CORE_ADDR lm_addr = 0, lm_prev = 0;
+ CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev;
+ int header_done = 0;
+
+ const struct link_map_offsets *lmo
+ = ((sizeof (T) == sizeof (int64_t))
+ ? &lmo_64bit_offsets : &lmo_32bit_offsets);
+ int ptr_size = sizeof (T);
+
+ while (annex[0] != '\0')
+ {
+ const char *sep = strchr (annex, '=');
+ if (sep == nullptr)
+ break;
+
+ int name_len = sep - annex;
+ CORE_ADDR *addrp;
+ if (name_len == 5 && startswith (annex, "start"))
+ addrp = &lm_addr;
+ else if (name_len == 4 && startswith (annex, "prev"))
+ addrp = &lm_prev;
+ else
+ {
+ annex = strchr (sep, ';');
+ if (annex == nullptr)
+ break;
+ annex++;
+ continue;
+ }
+
+ annex = decode_address_to_semicolon (addrp, sep + 1);
+ }
+
+ if (lm_addr == 0)
+ {
+ CORE_ADDR r_debug = get_r_debug<T> (target, pid);
+
+ /* We failed to find DT_DEBUG. Such situation will not change
+ for this inferior - do not retry it. Report it to GDB as
+ E01, see for the reasons at the GDB solib-svr4.c side. */
+ if (r_debug == (CORE_ADDR) -1)
+ return -1;
+
+ if (r_debug != 0)
+ {
+ CORE_ADDR map_offset = r_debug + lmo->r_map_offset;
+ if (read_one_ptr (target, map_offset, &lm_addr, ptr_size) != 0)
+ warning ("unable to read r_map from %s",
+ core_addr_to_string (map_offset));
+ }
+ }
+
+ std::string document = "<library-list-svr4 version=\"1.0\"";
+
+ while (lm_addr
+ && read_one_ptr (target, lm_addr + lmo->l_name_offset,
+ &l_name, ptr_size) == 0
+ && read_one_ptr (target, lm_addr + lmo->l_addr_offset,
+ &l_addr, ptr_size) == 0
+ && read_one_ptr (target, lm_addr + lmo->l_ld_offset,
+ &l_ld, ptr_size) == 0
+ && read_one_ptr (target, lm_addr + lmo->l_prev_offset,
+ &l_prev, ptr_size) == 0
+ && read_one_ptr (target, lm_addr + lmo->l_next_offset,
+ &l_next, ptr_size) == 0)
+ {
+ if (lm_prev != l_prev)
+ {
+ warning ("Corrupted shared library list: 0x%lx != 0x%lx",
+ (long) lm_prev, (long) l_prev);
+ break;
+ }
+
+ /* Ignore the first entry even if it has valid name as the first entry
+ corresponds to the main executable. The first entry should not be
+ skipped if the dynamic loader was loaded late by a static executable
+ (see solib-svr4.c parameter ignore_first). But in such case the main
+ executable does not have PT_DYNAMIC present and this function already
+ exited above due to failed get_r_debug. */
+ if (lm_prev == 0)
+ string_appendf (document, " main-lm=\"0x%lx\"",
+ (unsigned long) lm_addr);
+ else
+ {
+ unsigned char libname[PATH_MAX];
+
+ /* Not checking for error because reading may stop before
+ we've got PATH_MAX worth of characters. */
+ libname[0] = '\0';
+ target->read_memory (l_name, libname, sizeof (libname) - 1);
+ libname[sizeof (libname) - 1] = '\0';
+ if (libname[0] != '\0')
+ {
+ if (!header_done)
+ {
+ /* Terminate `<library-list-svr4'. */
+ document += '>';
+ header_done = 1;
+ }
+
+ string_appendf (document, "<library name=\"");
+ xml_escape_text_append (&document, (char *) libname);
+ string_appendf (document, "\" lm=\"0x%lx\" "
+ "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
+ (unsigned long) lm_addr, (unsigned long) l_addr,
+ (unsigned long) l_ld);
+ }
+ }
+
+ lm_prev = lm_addr;
+ lm_addr = l_next;
+ }
+
+ if (!header_done)
+ {
+ /* Empty list; terminate `<library-list-svr4'. */
+ document += "/>";
+ }
+ else
+ document += "</library-list-svr4>";
+
+ int document_len = document.length ();
+ if (offset < document_len)
+ document_len -= offset;
+ else
+ document_len = 0;
+ if (len > document_len)
+ len = document_len;
+
+ memcpy (readbuf, document.data () + offset, len);
+
+ return len;
+}
+
+/* Return true if FILE is a 64-bit ELF file,
+ false if the file is not a 64-bit ELF file,
+ and error if the file is not accessible or doesn't exist. */
+
+static bool
+elf_64_file_p (const char *file)
+{
+ int fd = gdb::handle_eintr<int> (-1, ::open, file, O_RDONLY);
+ if (fd < 0)
+ perror_with_name (("open"));
+
+ Elf64_Ehdr header;
+ ssize_t ret = gdb::handle_eintr<ssize_t> (-1, ::read, fd, &header, sizeof (header));
+ if (ret == -1)
+ perror_with_name (("read"));
+ gdb::handle_eintr<int> (-1, ::close, fd);
+ if (ret != sizeof (header))
+ error ("Cannot read ELF file header: %s", file);
+
+ if (header.e_ident[EI_MAG0] != ELFMAG0
+ || header.e_ident[EI_MAG1] != ELFMAG1
+ || header.e_ident[EI_MAG2] != ELFMAG2
+ || header.e_ident[EI_MAG3] != ELFMAG3)
+ error ("Unrecognized ELF file header: %s", file);
+
+ return header.e_ident[EI_CLASS] == ELFCLASS64;
+}
+
+/* Construct qXfer:libraries-svr4:read reply. */
+
+int
+netbsd_process_target::qxfer_libraries_svr4 (const char *annex,
+ unsigned char *readbuf,
+ unsigned const char *writebuf,
+ CORE_ADDR offset, int len)
+{
+ if (writebuf != nullptr)
+ return -2;
+ if (readbuf == nullptr)
+ return -1;
+
+ struct process_info *proc = current_process ();
+ pid_t pid = proc->pid;
+ bool is_elf64 = elf_64_file_p (netbsd_nat::pid_to_exec_file (pid));
+
+ if (is_elf64)
+ return netbsd_qxfer_libraries_svr4<int64_t> (this, pid, annex, readbuf,
+ writebuf, offset, len);
+ else
+ return netbsd_qxfer_libraries_svr4<int32_t> (this, pid, annex, readbuf,
+ writebuf, offset, len);
+}
+
+/* Implement the supports_qxfer_libraries_svr4 target_ops method. */
+
+bool
+netbsd_process_target::supports_qxfer_libraries_svr4 ()
+{
+ return true;
+}
+
+/* Return the name of a file that can be opened to get the symbols for
+ the child process identified by PID. */
+
+char *
+netbsd_process_target::pid_to_exec_file (pid_t pid)
+{
+ return netbsd_nat::pid_to_exec_file (pid);
+}
+
+/* Implementation of the target_ops method "supports_pid_to_exec_file". */
+
+bool
+netbsd_process_target::supports_pid_to_exec_file ()
+{
+ return true;
+}
+
+/* Implementation of the target_ops method "supports_hardware_single_step". */
+bool
+netbsd_process_target::supports_hardware_single_step ()
+{
+ return true;
+}
+
+/* Implementation of the target_ops method "sw_breakpoint_from_kind". */
+
+const gdb_byte *
+netbsd_process_target::sw_breakpoint_from_kind (int kind, int *size)
+{
+ static gdb_byte brkpt[PTRACE_BREAKPOINT_SIZE] = {*PTRACE_BREAKPOINT};
+
+ *size = PTRACE_BREAKPOINT_SIZE;
+
+ return brkpt;
+}
+
+/* Implement the thread_name target_ops method. */
+
+const char *
+netbsd_process_target::thread_name (ptid_t ptid)
+{
+ return netbsd_nat::thread_name (ptid);
+}
+
+/* Implement the supports_catch_syscall target_ops method. */
+
+bool
+netbsd_process_target::supports_catch_syscall ()
+{
+ return true;
+}
+
+/* Implement the supports_read_auxv target_ops method. */
+
+bool
+netbsd_process_target::supports_read_auxv ()
+{
+ return true;
+}
+
+/* The NetBSD target ops object. */
+
+static netbsd_process_target the_netbsd_target;
+
+void
+initialize_low ()
+{
+ set_target_ops (&the_netbsd_target);
+ the_low_target.arch_setup ();
+}
diff --git a/gdbserver/netbsd-low.h b/gdbserver/netbsd-low.h
new file mode 100644
index 00000000000..3d2ec345a41
--- /dev/null
+++ b/gdbserver/netbsd-low.h
@@ -0,0 +1,154 @@
+/* Copyright (C) 2020 Free Software Foundation, Inc.
+
+ 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/>. */
+
+#ifndef GDBSERVER_NETBSD_LOW_H
+#define GDBSERVER_NETBSD_LOW_H
+
+struct regcache;
+struct target_desc;
+
+/* Some information relative to a given register set. */
+
+struct netbsd_regset_info
+{
+ /* The ptrace request needed to get/set registers of this set. */
+ int get_request, set_request;
+ /* The size of the register set. */
+ int size;
+ /* Fill the buffer BUF from the contents of the given REGCACHE. */
+ void (*fill_function) (struct regcache *regcache, char *buf);
+ /* Store the register value in BUF in the given REGCACHE. */
+ void (*store_function) (struct regcache *regcache, const char *buf);
+};
+
+/* A list of regsets for the target being debugged, terminated by an entry
+ where the size is negative.
+
+ This list should be created by the target-specific code. */
+
+extern struct netbsd_regset_info netbsd_target_regsets[];
+
+/* The target-specific operations for NetBSD support. */
+
+struct netbsd_target_ops
+{
+ /* Architecture-specific setup. */
+ void (*arch_setup) ();
+};
+
+/* Target ops definitions for a NetBSD target. */
+
+class netbsd_process_target : public process_stratum_target
+{
+public:
+
+ int create_inferior (const char *program,
+ const std::vector<char *> &program_args) override;
+
+ void post_create_inferior () override;
+
+ int attach (unsigned long pid) override;
+
+ int kill (process_info *proc) override;
+
+ int detach (process_info *proc) override;
+
+ void mourn (process_info *proc) override;
+
+ void join (int pid) override;
+
+ bool thread_alive (ptid_t pid) override;
+
+ void resume (thread_resume *resume_info, size_t n) override;
+
+ ptid_t wait (ptid_t ptid, target_waitstatus *status,
+ int options) override;
+
+ void fetch_registers (regcache *regcache, int regno) override;
+
+ void store_registers (regcache *regcache, int regno) override;
+
+ int read_memory (CORE_ADDR memaddr, unsigned char *myaddr,
+ int len) override;
+
+ int write_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
+ int len) override;
+
+ void request_interrupt () override;
+
+ bool supports_read_auxv () override;
+
+ int read_auxv (CORE_ADDR offset, unsigned char *myaddr,
+ unsigned int len) override;
+
+ bool supports_hardware_single_step () override;
+
+ const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
+
+ bool supports_z_point_type (char z_type) override;
+
+ int insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp) override;
+
+ int remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp) override;
+
+ bool stopped_by_sw_breakpoint () override;
+
+ bool supports_qxfer_siginfo () override;
+
+ int qxfer_siginfo (const char *annex, unsigned char *readbuf,
+ unsigned const char *writebuf, CORE_ADDR offset,
+ int len) override;
+
+ bool supports_stopped_by_sw_breakpoint () override;
+
+ bool supports_non_stop () override;
+
+ bool supports_multi_process () override;
+
+ bool supports_fork_events () override;
+
+ bool supports_vfork_events () override;
+
+ bool supports_exec_events () override;
+
+ bool supports_disable_randomization () override;
+
+ bool supports_qxfer_libraries_svr4 () override;
+
+ int qxfer_libraries_svr4 (const char*, unsigned char*, const unsigned char*,
+ CORE_ADDR, int) override;
+
+ bool supports_pid_to_exec_file () override;
+
+ char *pid_to_exec_file (int pid) override;
+
+ const char *thread_name (ptid_t thread) override;
+
+ bool supports_catch_syscall () override;
+};
+
+/* The inferior's target description. This is a global because the
+ NetBSD ports support neither bi-arch nor multi-process. */
+
+extern struct netbsd_target_ops the_low_target;
+
+/* XXX: multilib */
+extern const struct target_desc *netbsd_tdesc;
+
+#endif /* GDBSERVER_NETBSD_LOW_H */
diff --git a/gdbserver/netbsd-x86_64-low.cc b/gdbserver/netbsd-x86_64-low.cc
new file mode 100644
index 00000000000..9b8ea9b8aa6
--- /dev/null
+++ b/gdbserver/netbsd-x86_64-low.cc
@@ -0,0 +1,187 @@
+/* Copyright (C) 2020 Free Software Foundation, Inc.
+
+ 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 <sys/types.h>
+#include <sys/ptrace.h>
+#include <limits.h>
+
+#include "server.h"
+#include "netbsd-low.h"
+#include "gdbsupport/x86-xstate.h"
+#include "arch/amd64.h"
+#include "x86-tdesc.h"
+#include "tdesc.h"
+
+/* The index of various registers inside the regcache. */
+
+enum netbsd_x86_64_gdb_regnum
+{
+ AMD64_RAX_REGNUM, /* %rax */
+ AMD64_RBX_REGNUM, /* %rbx */
+ AMD64_RCX_REGNUM, /* %rcx */
+ AMD64_RDX_REGNUM, /* %rdx */
+ AMD64_RSI_REGNUM, /* %rsi */
+ AMD64_RDI_REGNUM, /* %rdi */
+ AMD64_RBP_REGNUM, /* %rbp */
+ AMD64_RSP_REGNUM, /* %rsp */
+ AMD64_R8_REGNUM, /* %r8 */
+ AMD64_R9_REGNUM, /* %r9 */
+ AMD64_R10_REGNUM, /* %r10 */
+ AMD64_R11_REGNUM, /* %r11 */
+ AMD64_R12_REGNUM, /* %r12 */
+ AMD64_R13_REGNUM, /* %r13 */
+ AMD64_R14_REGNUM, /* %r14 */
+ AMD64_R15_REGNUM, /* %r15 */
+ AMD64_RIP_REGNUM, /* %rip */
+ AMD64_EFLAGS_REGNUM, /* %eflags */
+ AMD64_CS_REGNUM, /* %cs */
+ AMD64_SS_REGNUM, /* %ss */
+ AMD64_DS_REGNUM, /* %ds */
+ AMD64_ES_REGNUM, /* %es */
+ AMD64_FS_REGNUM, /* %fs */
+ AMD64_GS_REGNUM, /* %gs */
+ AMD64_ST0_REGNUM = 24, /* %st0 */
+ AMD64_ST1_REGNUM, /* %st1 */
+ AMD64_FCTRL_REGNUM = AMD64_ST0_REGNUM + 8,
+ AMD64_FSTAT_REGNUM = AMD64_ST0_REGNUM + 9,
+ AMD64_FTAG_REGNUM = AMD64_ST0_REGNUM + 10,
+ AMD64_XMM0_REGNUM = 40, /* %xmm0 */
+ AMD64_XMM1_REGNUM, /* %xmm1 */
+ AMD64_MXCSR_REGNUM = AMD64_XMM0_REGNUM + 16,
+ AMD64_YMM0H_REGNUM, /* %ymm0h */
+ AMD64_YMM15H_REGNUM = AMD64_YMM0H_REGNUM + 15,
+ AMD64_BND0R_REGNUM = AMD64_YMM15H_REGNUM + 1,
+ AMD64_BND3R_REGNUM = AMD64_BND0R_REGNUM + 3,
+ AMD64_BNDCFGU_REGNUM,
+ AMD64_BNDSTATUS_REGNUM,
+ AMD64_XMM16_REGNUM,
+ AMD64_XMM31_REGNUM = AMD64_XMM16_REGNUM + 15,
+ AMD64_YMM16H_REGNUM,
+ AMD64_YMM31H_REGNUM = AMD64_YMM16H_REGNUM + 15,
+ AMD64_K0_REGNUM,
+ AMD64_K7_REGNUM = AMD64_K0_REGNUM + 7,
+ AMD64_ZMM0H_REGNUM,
+ AMD64_ZMM31H_REGNUM = AMD64_ZMM0H_REGNUM + 31,
+ AMD64_PKRU_REGNUM,
+ AMD64_FSBASE_REGNUM,
+ AMD64_GSBASE_REGNUM
+};
+
+/* The fill_function for the general-purpose register set. */
+
+static void
+netbsd_x86_64_fill_gregset (struct regcache *regcache, char *buf)
+{
+ struct reg *r = (struct reg *) buf;
+
+#define netbsd_x86_64_collect_gp(regnum, fld) do { \
+ collect_register (regcache, regnum, &r->regs[_REG_##fld]); \
+ } while (0)
+
+ netbsd_x86_64_collect_gp (AMD64_RAX_REGNUM, RAX);
+ netbsd_x86_64_collect_gp (AMD64_RBX_REGNUM, RBX);
+ netbsd_x86_64_collect_gp (AMD64_RCX_REGNUM, RCX);
+ netbsd_x86_64_collect_gp (AMD64_RDX_REGNUM, RDX);
+ netbsd_x86_64_collect_gp (AMD64_RSI_REGNUM, RSI);
+ netbsd_x86_64_collect_gp (AMD64_RDI_REGNUM, RDI);
+ netbsd_x86_64_collect_gp (AMD64_RBP_REGNUM, RBP);
+ netbsd_x86_64_collect_gp (AMD64_RSP_REGNUM, RSP);
+ netbsd_x86_64_collect_gp (AMD64_R8_REGNUM, R8);
+ netbsd_x86_64_collect_gp (AMD64_R9_REGNUM, R9);
+ netbsd_x86_64_collect_gp (AMD64_R10_REGNUM, R10);
+ netbsd_x86_64_collect_gp (AMD64_R11_REGNUM, R11);
+ netbsd_x86_64_collect_gp (AMD64_R12_REGNUM, R12);
+ netbsd_x86_64_collect_gp (AMD64_R13_REGNUM, R13);
+ netbsd_x86_64_collect_gp (AMD64_R14_REGNUM, R14);
+ netbsd_x86_64_collect_gp (AMD64_R15_REGNUM, R15);
+ netbsd_x86_64_collect_gp (AMD64_RIP_REGNUM, RIP);
+ netbsd_x86_64_collect_gp (AMD64_EFLAGS_REGNUM, RFLAGS);
+ netbsd_x86_64_collect_gp (AMD64_CS_REGNUM, CS);
+ netbsd_x86_64_collect_gp (AMD64_SS_REGNUM, SS);
+ netbsd_x86_64_collect_gp (AMD64_DS_REGNUM, DS);
+ netbsd_x86_64_collect_gp (AMD64_ES_REGNUM, ES);
+ netbsd_x86_64_collect_gp (AMD64_FS_REGNUM, FS);
+ netbsd_x86_64_collect_gp (AMD64_GS_REGNUM, GS);
+}
+
+/* The store_function for the general-purpose register set. */
+
+static void
+netbsd_x86_64_store_gregset (struct regcache *regcache, const char *buf)
+{
+ struct reg *r = (struct reg *) buf;
+
+#define netbsd_x86_64_supply_gp(regnum, fld) do { \
+ supply_register (regcache, regnum, &r->regs[_REG_##fld]); \
+ } while(0)
+
+ netbsd_x86_64_supply_gp (AMD64_RAX_REGNUM, RAX);
+ netbsd_x86_64_supply_gp (AMD64_RBX_REGNUM, RBX);
+ netbsd_x86_64_supply_gp (AMD64_RCX_REGNUM, RCX);
+ netbsd_x86_64_supply_gp (AMD64_RDX_REGNUM, RDX);
+ netbsd_x86_64_supply_gp (AMD64_RSI_REGNUM, RSI);
+ netbsd_x86_64_supply_gp (AMD64_RDI_REGNUM, RDI);
+ netbsd_x86_64_supply_gp (AMD64_RBP_REGNUM, RBP);
+ netbsd_x86_64_supply_gp (AMD64_RSP_REGNUM, RSP);
+ netbsd_x86_64_supply_gp (AMD64_R8_REGNUM, R8);
+ netbsd_x86_64_supply_gp (AMD64_R9_REGNUM, R9);
+ netbsd_x86_64_supply_gp (AMD64_R10_REGNUM, R10);
+ netbsd_x86_64_supply_gp (AMD64_R11_REGNUM, R11);
+ netbsd_x86_64_supply_gp (AMD64_R12_REGNUM, R12);
+ netbsd_x86_64_supply_gp (AMD64_R13_REGNUM, R13);
+ netbsd_x86_64_supply_gp (AMD64_R14_REGNUM, R14);
+ netbsd_x86_64_supply_gp (AMD64_R15_REGNUM, R15);
+ netbsd_x86_64_supply_gp (AMD64_RIP_REGNUM, RIP);
+ netbsd_x86_64_supply_gp (AMD64_EFLAGS_REGNUM, RFLAGS);
+ netbsd_x86_64_supply_gp (AMD64_CS_REGNUM, CS);
+ netbsd_x86_64_supply_gp (AMD64_SS_REGNUM, SS);
+ netbsd_x86_64_supply_gp (AMD64_DS_REGNUM, DS);
+ netbsd_x86_64_supply_gp (AMD64_ES_REGNUM, ES);
+ netbsd_x86_64_supply_gp (AMD64_FS_REGNUM, FS);
+ netbsd_x86_64_supply_gp (AMD64_GS_REGNUM, GS);
+}
+
+/* Implements the netbsd_target_ops.arch_setup routine. */
+
+static void
+netbsd_x86_64_arch_setup (void)
+{
+ struct target_desc *tdesc
+ = amd64_create_target_description (X86_XSTATE_SSE_MASK, false, false, false);
+
+ init_target_desc (tdesc, amd64_expedite_regs);
+
+ netbsd_tdesc = tdesc;
+}
+
+/* Description of all the x86-netbsd register sets. */
+
+struct netbsd_regset_info netbsd_target_regsets[] =
+{
+ /* General Purpose Registers. */
+ {PT_GETREGS, PT_SETREGS, sizeof (struct reg),
+ netbsd_x86_64_fill_gregset, netbsd_x86_64_store_gregset},
+ /* End of list marker. */
+ {0, 0, -1, NULL, NULL }
+};
+
+/* The netbsd_target_ops vector for x86-netbsd. */
+
+struct netbsd_target_ops the_low_target =
+{
+ netbsd_x86_64_arch_setup,
+};
--
2.28.0