/* Native-dependent code for NetBSD.
- Copyright (C) 2006-2016 Free Software Foundation, Inc.
+ Copyright (C) 2006-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "nbsd-nat.h"
+#include "gdbthread.h"
+#include "nbsd-tdep.h"
+#include "inferior.h"
+#include "gdbarch.h"
+
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <sys/sysctl.h>
/* Return the name of a file that can be opened to get the symbols for
the child process identified by PID. */
char *
-nbsd_pid_to_exec_file (struct target_ops *self, int pid)
+nbsd_nat_target::pid_to_exec_file (int pid)
{
- ssize_t len;
static char buf[PATH_MAX];
- char name[PATH_MAX];
+ size_t buflen;
+ int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_PATHNAME};
+ buflen = sizeof (buf);
+ if (sysctl (mib, ARRAY_SIZE (mib), buf, &buflen, NULL, 0))
+ return NULL;
+ return buf;
+}
+
+/* Return the current directory for the process identified by PID. */
+
+static std::string
+nbsd_pid_to_cwd (int pid)
+{
+ char buf[PATH_MAX];
+ size_t buflen;
+ int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_CWD};
+ buflen = sizeof (buf);
+ if (sysctl (mib, ARRAY_SIZE (mib), buf, &buflen, NULL, 0))
+ return "";
+ return buf;
+}
+
+/* Return the command line for the process identified by PID. */
+
+static gdb::unique_xmalloc_ptr<char[]>
+nbsd_pid_to_cmdline (int pid)
+{
+ int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV};
+
+ size_t size = 0;
+ if (sysctl (mib, ARRAY_SIZE (mib), NULL, &size, NULL, 0) == -1 || size == 0)
+ return nullptr;
+
+ gdb::unique_xmalloc_ptr<char[]> args (XNEWVAR (char, size));
+
+ if (sysctl (mib, ARRAY_SIZE (mib), args.get (), &size, NULL, 0) == -1
+ || size == 0)
+ return nullptr;
+
+ /* Arguments are returned as a flattened string with NUL separators.
+ Join the arguments with spaces to form a single string. */
+ for (size_t i = 0; i < size - 1; i++)
+ if (args[i] == '\0')
+ args[i] = ' ';
+ args[size - 1] = '\0';
+
+ return args;
+}
+
+/* Generic thread (LWP) lister within a specified process. The callback
+ parameters is a C++ function that is called for each detected thread. */
+
+static bool
+nbsd_thread_lister (const pid_t pid,
+ gdb::function_view<bool (const struct kinfo_lwp *)>
+ callback)
+{
+ int mib[5] = {CTL_KERN, KERN_LWP, pid, sizeof (struct kinfo_lwp), 0};
+ size_t size;
+
+ if (sysctl (mib, ARRAY_SIZE (mib), NULL, &size, NULL, 0) == -1 || size == 0)
+ perror_with_name (("sysctl"));
+
+ mib[4] = size / sizeof (size_t);
+
+ gdb::unique_xmalloc_ptr<struct kinfo_lwp[]> kl
+ ((struct kinfo_lwp *) xcalloc (size, 1));
- xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
- len = readlink (name, buf, PATH_MAX - 1);
- if (len != -1)
+ if (sysctl (mib, ARRAY_SIZE (mib), kl.get (), &size, NULL, 0) == -1
+ || size == 0)
+ perror_with_name (("sysctl"));
+
+ for (size_t i = 0; i < size / sizeof (struct kinfo_lwp); i++)
{
- buf[len] = '\0';
- return buf;
+ struct kinfo_lwp *l = &kl[i];
+
+ /* Return true if the specified thread is alive. */
+ auto lwp_alive
+ = [] (struct kinfo_lwp *lwp)
+ {
+ switch (lwp->l_stat)
+ {
+ case LSSLEEP:
+ case LSRUN:
+ case LSONPROC:
+ case LSSTOP:
+ case LSSUSPENDED:
+ return true;
+ default:
+ return false;
+ }
+ };
+
+ /* Ignore embryonic or demised threads. */
+ if (!lwp_alive (l))
+ continue;
+
+ if (callback (l))
+ return true;
+ }
+
+ return false;
+}
+
+/* Return true if PTID is still active in the inferior. */
+
+bool
+nbsd_nat_target::thread_alive (ptid_t ptid)
+{
+ pid_t pid = ptid.pid ();
+ int lwp = ptid.lwp ();
+
+ auto fn
+ = [&lwp] (const struct kinfo_lwp *kl)
+ {
+ return kl->l_lid == lwp;
+ };
+
+ return nbsd_thread_lister (pid, fn);
+}
+
+/* Return the name assigned to a thread by an application. Returns
+ the string in a static buffer. */
+
+const char *
+nbsd_nat_target::thread_name (struct thread_info *thr)
+{
+ ptid_t ptid = thr->ptid;
+ pid_t pid = ptid.pid ();
+ int lwp = ptid.lwp ();
+
+ static char buf[KI_LNAMELEN] = {};
+
+ auto fn
+ = [&lwp] (const struct kinfo_lwp *kl)
+ {
+ if (kl->l_lid == lwp)
+ {
+ xsnprintf (buf, sizeof buf, "%s", kl->l_name);
+ return true;
+ }
+ return false;
+ };
+
+ if (nbsd_thread_lister (pid, fn))
+ return buf;
+ else
+ return NULL;
+}
+
+/* Implement the "post_attach" target_ops method. */
+
+static void
+nbsd_add_threads (nbsd_nat_target *target, pid_t pid)
+{
+ auto fn
+ = [&target, &pid] (const struct kinfo_lwp *kl)
+ {
+ ptid_t ptid = ptid_t (pid, kl->l_lid, 0);
+ if (!in_thread_list (target, ptid))
+ {
+ if (inferior_ptid.lwp () == 0)
+ thread_change_ptid (target, inferior_ptid, ptid);
+ else
+ add_thread (target, ptid);
+ }
+ return false;
+ };
+
+ nbsd_thread_lister (pid, fn);
+}
+
+/* Implement the "post_attach" target_ops method. */
+
+void
+nbsd_nat_target::post_attach (int pid)
+{
+ nbsd_add_threads (this, pid);
+}
+
+/* Implement the "update_thread_list" target_ops method. */
+
+void
+nbsd_nat_target::update_thread_list ()
+{
+ prune_threads ();
+
+ nbsd_add_threads (this, inferior_ptid.pid ());
+}
+
+/* Convert PTID to a string. */
+
+std::string
+nbsd_nat_target::pid_to_str (ptid_t ptid)
+{
+ int lwp = ptid.lwp ();
+
+ if (lwp != 0)
+ {
+ pid_t pid = ptid.pid ();
+
+ return string_printf ("LWP %d of process %d", lwp, pid);
+ }
+
+ return normal_pid_to_str (ptid);
+}
+
+/* Retrieve all the memory regions in the specified process. */
+
+static gdb::unique_xmalloc_ptr<struct kinfo_vmentry[]>
+nbsd_kinfo_get_vmmap (pid_t pid, size_t *size)
+{
+ int mib[5] = {CTL_VM, VM_PROC, VM_PROC_MAP, pid,
+ sizeof (struct kinfo_vmentry)};
+
+ size_t length = 0;
+ if (sysctl (mib, ARRAY_SIZE (mib), NULL, &length, NULL, 0))
+ {
+ *size = 0;
+ return NULL;
+ }
+
+ /* Prereserve more space. The length argument is volatile and can change
+ between the sysctl(3) calls as this function can be called against a
+ running process. */
+ length = length * 5 / 3;
+
+ gdb::unique_xmalloc_ptr<struct kinfo_vmentry[]> kiv
+ (XNEWVAR (kinfo_vmentry, length));
+
+ if (sysctl (mib, ARRAY_SIZE (mib), kiv.get (), &length, NULL, 0))
+ {
+ *size = 0;
+ return NULL;
+ }
+
+ *size = length / sizeof (struct kinfo_vmentry);
+ return kiv;
+}
+
+/* Iterate over all the memory regions in the current inferior,
+ calling FUNC for each memory region. OBFD is passed as the last
+ argument to FUNC. */
+
+int
+nbsd_nat_target::find_memory_regions (find_memory_region_ftype func,
+ void *data)
+{
+ pid_t pid = inferior_ptid.pid ();
+
+ size_t nitems;
+ gdb::unique_xmalloc_ptr<struct kinfo_vmentry[]> vmentl
+ = nbsd_kinfo_get_vmmap (pid, &nitems);
+ if (vmentl == NULL)
+ perror_with_name (_("Couldn't fetch VM map entries."));
+
+ for (size_t i = 0; i < nitems; i++)
+ {
+ struct kinfo_vmentry *kve = &vmentl[i];
+
+ /* Skip unreadable segments and those where MAP_NOCORE has been set. */
+ if (!(kve->kve_protection & KVME_PROT_READ)
+ || kve->kve_flags & KVME_FLAG_NOCOREDUMP)
+ continue;
+
+ /* Skip segments with an invalid type. */
+ switch (kve->kve_type)
+ {
+ case KVME_TYPE_VNODE:
+ case KVME_TYPE_ANON:
+ case KVME_TYPE_SUBMAP:
+ case KVME_TYPE_OBJECT:
+ break;
+ default:
+ continue;
+ }
+
+ size_t size = kve->kve_end - kve->kve_start;
+ if (info_verbose)
+ {
+ fprintf_filtered (gdb_stdout,
+ "Save segment, %ld bytes at %s (%c%c%c)\n",
+ (long) size,
+ paddress (target_gdbarch (), kve->kve_start),
+ kve->kve_protection & KVME_PROT_READ ? 'r' : '-',
+ kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-',
+ kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-');
+ }
+
+ /* Invoke the callback function to create the corefile segment.
+ Pass MODIFIED as true, we do not know the real modification state. */
+ func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ,
+ kve->kve_protection & KVME_PROT_WRITE,
+ kve->kve_protection & KVME_PROT_EXEC, 1, data);
+ }
+ return 0;
+}
+
+/* Implement the "info_proc" target_ops method. */
+
+bool
+nbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
+{
+ pid_t pid;
+ bool do_cmdline = false;
+ bool do_cwd = false;
+ bool do_exe = false;
+ bool do_mappings = false;
+
+ switch (what)
+ {
+ case IP_MINIMAL:
+ do_cmdline = true;
+ do_cwd = true;
+ do_exe = true;
+ break;
+ case IP_MAPPINGS:
+ do_mappings = true;
+ break;
+ case IP_CMDLINE:
+ do_cmdline = true;
+ break;
+ case IP_EXE:
+ do_exe = true;
+ break;
+ case IP_CWD:
+ do_cwd = true;
+ break;
+ case IP_ALL:
+ do_cmdline = true;
+ do_cwd = true;
+ do_exe = true;
+ do_mappings = true;
+ break;
+ default:
+ error (_("Not supported on this target."));
+ }
+
+ gdb_argv built_argv (args);
+ if (built_argv.count () == 0)
+ {
+ pid = inferior_ptid.pid ();
+ if (pid == 0)
+ error (_("No current process: you must name one."));
+ }
+ else if (built_argv.count () == 1 && isdigit (built_argv[0][0]))
+ pid = strtol (built_argv[0], NULL, 10);
+ else
+ error (_("Invalid arguments."));
+
+ printf_filtered (_("process %d\n"), pid);
+
+ if (do_cmdline)
+ {
+ gdb::unique_xmalloc_ptr<char[]> cmdline = nbsd_pid_to_cmdline (pid);
+ if (cmdline != nullptr)
+ printf_filtered ("cmdline = '%s'\n", cmdline.get ());
+ else
+ warning (_("unable to fetch command line"));
+ }
+ if (do_cwd)
+ {
+ std::string cwd = nbsd_pid_to_cwd (pid);
+ if (cwd != "")
+ printf_filtered ("cwd = '%s'\n", cwd.c_str ());
+ else
+ warning (_("unable to fetch current working directory"));
+ }
+ if (do_exe)
+ {
+ const char *exe = pid_to_exec_file (pid);
+ if (exe != nullptr)
+ printf_filtered ("exe = '%s'\n", exe);
+ else
+ warning (_("unable to fetch executable path name"));
+ }
+ if (do_mappings)
+ {
+ size_t nvment;
+ gdb::unique_xmalloc_ptr<struct kinfo_vmentry[]> vmentl
+ = nbsd_kinfo_get_vmmap (pid, &nvment);
+
+ if (vmentl != nullptr)
+ {
+ int addr_bit = TARGET_CHAR_BIT * sizeof (void *);
+ nbsd_info_proc_mappings_header (addr_bit);
+
+ struct kinfo_vmentry *kve = vmentl.get ();
+ for (int i = 0; i < nvment; i++, kve++)
+ nbsd_info_proc_mappings_entry (addr_bit, kve->kve_start,
+ kve->kve_end, kve->kve_offset,
+ kve->kve_flags, kve->kve_protection,
+ kve->kve_path);
+ }
+ else
+ warning (_("unable to fetch virtual memory map"));
}
- return NULL;
+ return true;
}
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