/* Low-level child interface to ptrace.
- Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
- 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 1988-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "command.h"
#include "inferior.h"
#include "inflow.h"
+#include "terminal.h"
#include "gdbcore.h"
#include "regcache.h"
-
-#include "gdb_assert.h"
-#include "gdb_string.h"
-#include "gdb_ptrace.h"
-#include "gdb_wait.h"
+#include "nat/gdb_ptrace.h"
+#include "gdbsupport/gdb_wait.h"
#include <signal.h>
+#include "inf-ptrace.h"
#include "inf-child.h"
#include "gdbthread.h"
+#include "nat/fork-inferior.h"
+#include "utils.h"
+#include "gdbarch.h"
\f
-#ifdef PT_GET_PROCESS_STATE
+/* A unique_ptr helper to unpush a target. */
-static int
-inf_ptrace_follow_fork (struct target_ops *ops, int follow_child)
+struct target_unpusher
{
- pid_t pid, fpid;
- ptrace_state_t pe;
- struct thread_info *last_tp = NULL;
-
- /* FIXME: kettenis/20050720: This stuff should really be passed as
- an argument by our caller. */
+ void operator() (struct target_ops *ops) const
{
- ptid_t ptid;
- struct target_waitstatus status;
-
- get_last_target_status (&ptid, &status);
- gdb_assert (status.kind == TARGET_WAITKIND_FORKED);
-
- pid = ptid_get_pid (ptid);
- last_tp = find_thread_pid (ptid);
+ unpush_target (ops);
}
+};
- if (ptrace (PT_GET_PROCESS_STATE, pid,
- (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
- perror_with_name (("ptrace"));
-
- gdb_assert (pe.pe_report_event == PTRACE_FORK);
- fpid = pe.pe_other_pid;
+/* A unique_ptr that unpushes a target on destruction. */
- if (follow_child)
- {
- /* Copy user stepping state to the new inferior thread. */
- struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint;
- CORE_ADDR step_range_start = last_tp->step_range_start;
- CORE_ADDR step_range_end = last_tp->step_range_end;
- struct frame_id step_frame_id = last_tp->step_frame_id;
- int attach_flag = find_inferior_pid (pid)->attach_flag;
- struct inferior *inf;
- struct thread_info *tp;
-
- /* Otherwise, deleting the parent would get rid of this
- breakpoint. */
- last_tp->step_resume_breakpoint = NULL;
-
- /* Before detaching from the parent, remove all breakpoints from
- it. */
- remove_breakpoints ();
-
- if (ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
- perror_with_name (("ptrace"));
+typedef std::unique_ptr<struct target_ops, target_unpusher> target_unpush_up;
- /* Switch inferior_ptid out of the parent's way. */
- inferior_ptid = pid_to_ptid (fpid);
+\f
- /* Delete the parent. */
- detach_inferior (pid);
+inf_ptrace_target::~inf_ptrace_target ()
+{}
- /* Add the child. */
- inf = add_inferior (fpid);
- inf->attach_flag = attach_flag;
- tp = add_thread_silent (inferior_ptid);
+#ifdef PT_GET_PROCESS_STATE
- tp->step_resume_breakpoint = step_resume_breakpoint;
- tp->step_range_start = step_range_start;
- tp->step_range_end = step_range_end;
- tp->step_frame_id = step_frame_id;
+/* Target hook for follow_fork. On entry and at return inferior_ptid is
+ the ptid of the followed inferior. */
- /* Reset breakpoints in the child as appropriate. */
- follow_inferior_reset_breakpoints ();
- }
- else
+int
+inf_ptrace_target::follow_fork (int follow_child, int detach_fork)
+{
+ if (!follow_child)
{
- inferior_ptid = pid_to_ptid (pid);
- detach_breakpoints (fpid);
+ struct thread_info *tp = inferior_thread ();
+ pid_t child_pid = tp->pending_follow.value.related_pid.pid ();
- if (ptrace (PT_DETACH, fpid, (PTRACE_TYPE_ARG3)1, 0) == -1)
+ /* Breakpoints have already been detached from the child by
+ infrun.c. */
+
+ if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
perror_with_name (("ptrace"));
- detach_inferior (pid);
}
return 0;
}
+int
+inf_ptrace_target::insert_fork_catchpoint (int pid)
+{
+ return 0;
+}
+
+int
+inf_ptrace_target::remove_fork_catchpoint (int pid)
+{
+ return 0;
+}
+
#endif /* PT_GET_PROCESS_STATE */
\f
inf_ptrace_me (void)
{
/* "Trace me, Dr. Memory!" */
- ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0);
+ if (ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3) 0, 0) < 0)
+ trace_start_error_with_name ("ptrace");
}
/* Start a new inferior Unix child process. EXEC_FILE is the file to
ENV is the environment vector to pass. If FROM_TTY is non-zero, be
chatty about it. */
-static void
-inf_ptrace_create_inferior (struct target_ops *ops,
- char *exec_file, char *allargs, char **env,
- int from_tty)
+void
+inf_ptrace_target::create_inferior (const char *exec_file,
+ const std::string &allargs,
+ char **env, int from_tty)
{
- int pid;
+ pid_t pid;
+ ptid_t ptid;
- pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL,
- NULL, NULL);
+ /* Do not change either targets above or the same target if already present.
+ The reason is the target stack is shared across multiple inferiors. */
+ int ops_already_pushed = target_is_pushed (this);
- push_target (ops);
+ target_unpush_up unpusher;
+ if (! ops_already_pushed)
+ {
+ /* Clear possible core file with its process_stratum. */
+ push_target (this);
+ unpusher.reset (this);
+ }
+
+ pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL,
+ NULL, NULL, NULL);
- /* On some targets, there must be some explicit synchronization
- between the parent and child processes after the debugger
- forks, and before the child execs the debuggee program. This
- call basically gives permission for the child to exec. */
+ ptid = ptid_t (pid);
+ /* We have something that executes now. We'll be running through
+ the shell at this point (if startup-with-shell is true), but the
+ pid shouldn't change. */
+ add_thread_silent (this, ptid);
- target_acknowledge_created_inferior (pid);
+ unpusher.release ();
- /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will
- be 1 or 2 depending on whether we're starting without or with a
- shell. */
- startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
+ gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED);
/* On some targets, there must be some explicit actions taken after
the inferior has been started up. */
- target_post_startup_inferior (pid_to_ptid (pid));
+ target_post_startup_inferior (ptid);
}
#ifdef PT_GET_PROCESS_STATE
-static void
-inf_ptrace_post_startup_inferior (ptid_t pid)
+void
+inf_ptrace_target::post_startup_inferior (ptid_t pid)
{
ptrace_event_t pe;
/* Set the initial event mask. */
memset (&pe, 0, sizeof pe);
pe.pe_set_event |= PTRACE_FORK;
- if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid),
+ if (ptrace (PT_SET_EVENT_MASK, pid.pid (),
(PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
perror_with_name (("ptrace"));
}
/* Clean up a rotting corpse of an inferior after it died. */
-static void
-inf_ptrace_mourn_inferior (struct target_ops *ops)
+void
+inf_ptrace_target::mourn_inferior ()
{
int status;
Do not check whether this succeeds though, since we may be
dealing with a process that we attached to. Such a process will
only report its exit status to its original parent. */
- waitpid (ptid_get_pid (inferior_ptid), &status, 0);
+ waitpid (inferior_ptid.pid (), &status, 0);
- unpush_target (ops);
- generic_mourn_inferior ();
+ inf_child_target::mourn_inferior ();
}
/* Attach to the process specified by ARGS. If FROM_TTY is non-zero,
be chatty about it. */
-static void
-inf_ptrace_attach (struct target_ops *ops, char *args, int from_tty)
+void
+inf_ptrace_target::attach (const char *args, int from_tty)
{
- char *exec_file;
pid_t pid;
- char *dummy;
struct inferior *inf;
- if (!args)
- error_no_arg (_("process-id to attach"));
+ /* Do not change either targets above or the same target if already present.
+ The reason is the target stack is shared across multiple inferiors. */
+ int ops_already_pushed = target_is_pushed (this);
- dummy = args;
- pid = strtol (args, &dummy, 0);
- /* Some targets don't set errno on errors, grrr! */
- if (pid == 0 && args == dummy)
- error (_("Illegal process-id: %s."), args);
+ pid = parse_pid_to_attach (args);
if (pid == getpid ()) /* Trying to masturbate? */
error (_("I refuse to debug myself!"));
+ target_unpush_up unpusher;
+ if (! ops_already_pushed)
+ {
+ /* target_pid_to_str already uses the target. Also clear possible core
+ file with its process_stratum. */
+ push_target (this);
+ unpusher.reset (this);
+ }
+
if (from_tty)
{
- exec_file = get_exec_file (0);
+ const char *exec_file = get_exec_file (0);
if (exec_file)
printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file,
- target_pid_to_str (pid_to_ptid (pid)));
+ target_pid_to_str (ptid_t (pid)).c_str ());
else
printf_unfiltered (_("Attaching to %s\n"),
- target_pid_to_str (pid_to_ptid (pid)));
-
- gdb_flush (gdb_stdout);
+ target_pid_to_str (ptid_t (pid)).c_str ());
}
#ifdef PT_ATTACH
error (_("This system does not support attaching to a process"));
#endif
- inferior_ptid = pid_to_ptid (pid);
-
- inf = add_inferior (pid);
+ inf = current_inferior ();
+ inferior_appeared (inf, pid);
inf->attach_flag = 1;
+ inferior_ptid = ptid_t (pid);
/* Always add a main thread. If some target extends the ptrace
target, it should decorate the ptid later with more info. */
- add_thread_silent (inferior_ptid);
+ thread_info *thr = add_thread_silent (this, inferior_ptid);
+ /* Don't consider the thread stopped until we've processed its
+ initial SIGSTOP stop. */
+ set_executing (this, thr->ptid, true);
- push_target(ops);
+ unpusher.release ();
}
#ifdef PT_GET_PROCESS_STATE
void
-inf_ptrace_post_attach (int pid)
+inf_ptrace_target::post_attach (int pid)
{
ptrace_event_t pe;
#endif
-/* Detach from the inferior, optionally passing it the signal
- specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */
+/* Detach from the inferior. If FROM_TTY is non-zero, be chatty about it. */
-static void
-inf_ptrace_detach (struct target_ops *ops, char *args, int from_tty)
+void
+inf_ptrace_target::detach (inferior *inf, int from_tty)
{
- pid_t pid = ptid_get_pid (inferior_ptid);
- int sig = 0;
+ pid_t pid = inferior_ptid.pid ();
- if (from_tty)
- {
- char *exec_file = get_exec_file (0);
- if (exec_file == 0)
- exec_file = "";
- printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file,
- target_pid_to_str (pid_to_ptid (pid)));
- gdb_flush (gdb_stdout);
- }
- if (args)
- sig = atoi (args);
+ target_announce_detach (from_tty);
#ifdef PT_DETACH
/* We'd better not have left any breakpoints in the program or it'll
previously attached to the inferior. It *might* work if we
started the process ourselves. */
errno = 0;
- ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig);
+ ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0);
if (errno != 0)
perror_with_name (("ptrace"));
#else
error (_("This system does not support detaching from a process"));
#endif
+ detach_success (inf);
+}
+
+/* See inf-ptrace.h. */
+
+void
+inf_ptrace_target::detach_success (inferior *inf)
+{
inferior_ptid = null_ptid;
- detach_inferior (pid);
+ detach_inferior (inf);
- if (!have_inferiors ())
- unpush_target (ops);
+ maybe_unpush_target ();
}
/* Kill the inferior. */
-static void
-inf_ptrace_kill (void)
+void
+inf_ptrace_target::kill ()
{
- pid_t pid = ptid_get_pid (inferior_ptid);
+ pid_t pid = inferior_ptid.pid ();
int status;
if (pid == 0)
ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0);
waitpid (pid, &status, 0);
- target_mourn_inferior ();
+ target_mourn_inferior (inferior_ptid);
}
-/* Stop the inferior. */
+/* Return which PID to pass to ptrace in order to observe/control the
+ tracee identified by PTID. */
-static void
-inf_ptrace_stop (ptid_t ptid)
+pid_t
+get_ptrace_pid (ptid_t ptid)
{
- /* Send a SIGINT to the process group. This acts just like the user
- typed a ^C on the controlling terminal. Note that using a
- negative process number in kill() is a System V-ism. The proper
- BSD interface is killpg(). However, all modern BSDs support the
- System V interface too. */
- kill (-inferior_process_group, SIGINT);
+ pid_t pid;
+
+ /* If we have an LWPID to work with, use it. Otherwise, we're
+ dealing with a non-threaded program/target. */
+ pid = ptid.lwp ();
+ if (pid == 0)
+ pid = ptid.pid ();
+ return pid;
}
/* Resume execution of thread PTID, or all threads if PTID is -1. If
STEP is nonzero, single-step it. If SIGNAL is nonzero, give it
that signal. */
-static void
-inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal)
+void
+inf_ptrace_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
{
- pid_t pid = ptid_get_pid (ptid);
- int request = PT_CONTINUE;
+ pid_t pid;
+ int request;
- if (pid == -1)
+ if (minus_one_ptid == ptid)
/* Resume all threads. Traditionally ptrace() only supports
single-threaded processes, so simply resume the inferior. */
- pid = ptid_get_pid (inferior_ptid);
+ pid = inferior_ptid.pid ();
+ else
+ pid = get_ptrace_pid (ptid);
+
+ if (catch_syscall_enabled () > 0)
+ request = PT_SYSCALL;
+ else
+ request = PT_CONTINUE;
if (step)
{
where it was. If GDB wanted it to start some other way, we have
already written a new program counter value to the child. */
errno = 0;
- ptrace (request, pid, (PTRACE_TYPE_ARG3)1, target_signal_to_host (signal));
+ ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal));
if (errno != 0)
perror_with_name (("ptrace"));
}
process ID of the child, or MINUS_ONE_PTID in case of error; store
the status in *OURSTATUS. */
-static ptid_t
-inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
+ptid_t
+inf_ptrace_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
+ int options)
{
pid_t pid;
int status, save_errno;
do
{
- pid = waitpid (ptid_get_pid (ptid), &status, 0);
+ pid = waitpid (ptid.pid (), &status, 0);
save_errno = errno;
}
while (pid == -1 && errno == EINTR);
/* Claim it exited with unknown signal. */
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
- ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+ ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
return inferior_ptid;
}
/* Ignore terminated detached child processes. */
- if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
+ if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ())
pid = -1;
}
while (pid == -1);
{
case PTRACE_FORK:
ourstatus->kind = TARGET_WAITKIND_FORKED;
- ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid);
+ ourstatus->value.related_pid = ptid_t (pe.pe_other_pid);
/* Make sure the other end of the fork is stopped too. */
fpid = waitpid (pe.pe_other_pid, &status, 0);
gdb_assert (pe.pe_report_event == PTRACE_FORK);
gdb_assert (pe.pe_other_pid == pid);
- if (fpid == ptid_get_pid (inferior_ptid))
+ if (fpid == inferior_ptid.pid ())
{
- ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid);
- return pid_to_ptid (fpid);
+ ourstatus->value.related_pid = ptid_t (pe.pe_other_pid);
+ return ptid_t (fpid);
}
- return pid_to_ptid (pid);
+ return ptid_t (pid);
}
}
#endif
store_waitstatus (ourstatus, status);
- return pid_to_ptid (pid);
+ return ptid_t (pid);
}
-/* Attempt a transfer all LEN bytes starting at OFFSET between the
- inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer.
- Return the number of bytes actually transferred. */
+/* Transfer data via ptrace into process PID's memory from WRITEBUF, or
+ from process PID's memory into READBUF. Start at target address ADDR
+ and transfer up to LEN bytes. Exactly one of READBUF and WRITEBUF must
+ be non-null. Return the number of transferred bytes. */
-static LONGEST
-inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
- const char *annex, gdb_byte *readbuf,
- const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
+static ULONGEST
+inf_ptrace_peek_poke (pid_t pid, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST addr, ULONGEST len)
{
- pid_t pid = ptid_get_pid (inferior_ptid);
+ ULONGEST n;
+ unsigned int chunk;
+
+ /* We transfer aligned words. Thus align ADDR down to a word
+ boundary and determine how many bytes to skip at the
+ beginning. */
+ ULONGEST skip = addr & (sizeof (PTRACE_TYPE_RET) - 1);
+ addr -= skip;
+
+ for (n = 0;
+ n < len;
+ n += chunk, addr += sizeof (PTRACE_TYPE_RET), skip = 0)
+ {
+ /* Restrict to a chunk that fits in the current word. */
+ chunk = std::min (sizeof (PTRACE_TYPE_RET) - skip, len - n);
+
+ /* Use a union for type punning. */
+ union
+ {
+ PTRACE_TYPE_RET word;
+ gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
+ } buf;
+
+ /* Read the word, also when doing a partial word write. */
+ if (readbuf != NULL || chunk < sizeof (PTRACE_TYPE_RET))
+ {
+ errno = 0;
+ buf.word = ptrace (PT_READ_I, pid,
+ (PTRACE_TYPE_ARG3)(uintptr_t) addr, 0);
+ if (errno != 0)
+ break;
+ if (readbuf != NULL)
+ memcpy (readbuf + n, buf.byte + skip, chunk);
+ }
+ if (writebuf != NULL)
+ {
+ memcpy (buf.byte + skip, writebuf + n, chunk);
+ errno = 0;
+ ptrace (PT_WRITE_D, pid, (PTRACE_TYPE_ARG3)(uintptr_t) addr,
+ buf.word);
+ if (errno != 0)
+ {
+ /* Using the appropriate one (I or D) is necessary for
+ Gould NP1, at least. */
+ errno = 0;
+ ptrace (PT_WRITE_I, pid, (PTRACE_TYPE_ARG3)(uintptr_t) addr,
+ buf.word);
+ if (errno != 0)
+ break;
+ }
+ }
+ }
+
+ return n;
+}
+
+/* Implement the to_xfer_partial target_ops method. */
+
+enum target_xfer_status
+inf_ptrace_target::xfer_partial (enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
+{
+ pid_t pid = get_ptrace_pid (inferior_ptid);
switch (object)
{
errno = 0;
if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0)
- /* Return the actual number of bytes read or written. */
- return piod.piod_len;
+ {
+ /* Return the actual number of bytes read or written. */
+ *xfered_len = piod.piod_len;
+ return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK;
+ }
/* If the PT_IO request is somehow not supported, fallback on
using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
to indicate failure. */
if (errno != EINVAL)
- return 0;
+ return TARGET_XFER_EOF;
}
#endif
+ *xfered_len = inf_ptrace_peek_poke (pid, readbuf, writebuf,
+ offset, len);
+ return *xfered_len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF;
+
+ case TARGET_OBJECT_UNWIND_TABLE:
+ return TARGET_XFER_E_IO;
+
+ case TARGET_OBJECT_AUXV:
+#if defined (PT_IO) && defined (PIOD_READ_AUXV)
+ /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO
+ request that allows us to read the auxilliary vector. Other
+ BSD's may follow if they feel the need to support PIE. */
{
- union
- {
- PTRACE_TYPE_RET word;
- gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
- } buffer;
- ULONGEST rounded_offset;
- LONGEST partial_len;
-
- /* Round the start offset down to the next long word
- boundary. */
- rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
-
- /* Since ptrace will transfer a single word starting at that
- rounded_offset the partial_len needs to be adjusted down to
- that (remember this function only does a single transfer).
- Should the required length be even less, adjust it down
- again. */
- partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
- if (partial_len > len)
- partial_len = len;
+ struct ptrace_io_desc piod;
if (writebuf)
- {
- /* If OFFSET:PARTIAL_LEN is smaller than
- ROUNDED_OFFSET:WORDSIZE then a read/modify write will
- be needed. Read in the entire word. */
- if (rounded_offset < offset
- || (offset + partial_len
- < rounded_offset + sizeof (PTRACE_TYPE_RET)))
- /* Need part of initial word -- fetch it. */
- buffer.word = ptrace (PT_READ_I, pid,
- (PTRACE_TYPE_ARG3)(uintptr_t)
- rounded_offset, 0);
-
- /* Copy data to be written over corresponding part of
- buffer. */
- memcpy (buffer.byte + (offset - rounded_offset),
- writebuf, partial_len);
-
- errno = 0;
- ptrace (PT_WRITE_D, pid,
- (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset,
- buffer.word);
- if (errno)
- {
- /* Using the appropriate one (I or D) is necessary for
- Gould NP1, at least. */
- errno = 0;
- ptrace (PT_WRITE_I, pid,
- (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset,
- buffer.word);
- if (errno)
- return 0;
- }
- }
+ return TARGET_XFER_E_IO;
+ piod.piod_op = PIOD_READ_AUXV;
+ piod.piod_addr = readbuf;
+ piod.piod_offs = (void *) (long) offset;
+ piod.piod_len = len;
- if (readbuf)
+ errno = 0;
+ if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0)
{
- errno = 0;
- buffer.word = ptrace (PT_READ_I, pid,
- (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset,
- 0);
- if (errno)
- return 0;
- /* Copy appropriate bytes out of the buffer. */
- memcpy (readbuf, buffer.byte + (offset - rounded_offset),
- partial_len);
+ /* Return the actual number of bytes read or written. */
+ *xfered_len = piod.piod_len;
+ return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK;
}
-
- return partial_len;
}
-
- case TARGET_OBJECT_UNWIND_TABLE:
- return -1;
-
- case TARGET_OBJECT_AUXV:
- return -1;
+#endif
+ return TARGET_XFER_E_IO;
case TARGET_OBJECT_WCOOKIE:
- return -1;
+ return TARGET_XFER_E_IO;
default:
- return -1;
+ return TARGET_XFER_E_IO;
}
}
/* Return non-zero if the thread specified by PTID is alive. */
-static int
-inf_ptrace_thread_alive (ptid_t ptid)
+bool
+inf_ptrace_target::thread_alive (ptid_t ptid)
{
/* ??? Is kill the right way to do this? */
- return (kill (ptid_get_pid (ptid), 0) != -1);
+ return (::kill (ptid.pid (), 0) != -1);
}
/* Print status information about what we're accessing. */
-static void
-inf_ptrace_files_info (struct target_ops *ignore)
+void
+inf_ptrace_target::files_info ()
{
struct inferior *inf = current_inferior ();
printf_filtered (_("\tUsing the running image of %s %s.\n"),
inf->attach_flag ? "attached" : "child",
- target_pid_to_str (inferior_ptid));
-}
-
-/* Create a prototype ptrace target. The client can override it with
- local methods. */
-
-struct target_ops *
-inf_ptrace_target (void)
-{
- struct target_ops *t = inf_child_target ();
-
- t->to_attach = inf_ptrace_attach;
- t->to_detach = inf_ptrace_detach;
- t->to_resume = inf_ptrace_resume;
- t->to_wait = inf_ptrace_wait;
- t->to_files_info = inf_ptrace_files_info;
- t->to_kill = inf_ptrace_kill;
- t->to_create_inferior = inf_ptrace_create_inferior;
-#ifdef PT_GET_PROCESS_STATE
- t->to_follow_fork = inf_ptrace_follow_fork;
- t->to_post_startup_inferior = inf_ptrace_post_startup_inferior;
- t->to_post_attach = inf_ptrace_post_attach;
-#endif
- t->to_mourn_inferior = inf_ptrace_mourn_inferior;
- t->to_thread_alive = inf_ptrace_thread_alive;
- t->to_pid_to_str = normal_pid_to_str;
- t->to_stop = inf_ptrace_stop;
- t->to_xfer_partial = inf_ptrace_xfer_partial;
-
- return t;
-}
-\f
-
-/* Pointer to a function that returns the offset within the user area
- where a particular register is stored. */
-static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int);
-
-/* Fetch register REGNUM from the inferior. */
-
-static void
-inf_ptrace_fetch_register (struct regcache *regcache, int regnum)
-{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
- CORE_ADDR addr;
- size_t size;
- PTRACE_TYPE_RET *buf;
- int pid, i;
-
- /* This isn't really an address, but ptrace thinks of it as one. */
- addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0);
- if (addr == (CORE_ADDR)-1
- || gdbarch_cannot_fetch_register (gdbarch, regnum))
- {
- regcache_raw_supply (regcache, regnum, NULL);
- return;
- }
-
- /* Cater for systems like GNU/Linux, that implement threads as
- separate processes. */
- pid = ptid_get_lwp (inferior_ptid);
- if (pid == 0)
- pid = ptid_get_pid (inferior_ptid);
-
- size = register_size (gdbarch, regnum);
- gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
- buf = alloca (size);
-
- /* Read the register contents from the inferior a chunk at a time. */
- for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
- {
- errno = 0;
- buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0);
- if (errno != 0)
- error (_("Couldn't read register %s (#%d): %s."),
- gdbarch_register_name (gdbarch, regnum),
- regnum, safe_strerror (errno));
-
- addr += sizeof (PTRACE_TYPE_RET);
- }
- regcache_raw_supply (regcache, regnum, buf);
+ target_pid_to_str (inferior_ptid).c_str ());
}
-/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
- for all registers. */
-
-static void
-inf_ptrace_fetch_registers (struct regcache *regcache, int regnum)
+std::string
+inf_ptrace_target::pid_to_str (ptid_t ptid)
{
- if (regnum == -1)
- for (regnum = 0;
- regnum < gdbarch_num_regs (get_regcache_arch (regcache));
- regnum++)
- inf_ptrace_fetch_register (regcache, regnum);
- else
- inf_ptrace_fetch_register (regcache, regnum);
+ return normal_pid_to_str (ptid);
}
-/* Store register REGNUM into the inferior. */
+#if defined (PT_IO) && defined (PIOD_READ_AUXV)
-static void
-inf_ptrace_store_register (const struct regcache *regcache, int regnum)
-{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
- CORE_ADDR addr;
- size_t size;
- PTRACE_TYPE_RET *buf;
- int pid, i;
-
- /* This isn't really an address, but ptrace thinks of it as one. */
- addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1);
- if (addr == (CORE_ADDR)-1
- || gdbarch_cannot_store_register (gdbarch, regnum))
- return;
-
- /* Cater for systems like GNU/Linux, that implement threads as
- separate processes. */
- pid = ptid_get_lwp (inferior_ptid);
- if (pid == 0)
- pid = ptid_get_pid (inferior_ptid);
-
- size = register_size (gdbarch, regnum);
- gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
- buf = alloca (size);
-
- /* Write the register contents into the inferior a chunk at a time. */
- regcache_raw_collect (regcache, regnum, buf);
- for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
- {
- errno = 0;
- ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]);
- if (errno != 0)
- error (_("Couldn't write register %s (#%d): %s."),
- gdbarch_register_name (gdbarch, regnum),
- regnum, safe_strerror (errno));
-
- addr += sizeof (PTRACE_TYPE_RET);
- }
-}
-
-/* Store register REGNUM back into the inferior. If REGNUM is -1, do
- this for all registers. */
+/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
+ Return 0 if *READPTR is already at the end of the buffer.
+ Return -1 if there is insufficient buffer for a whole entry.
+ Return 1 if an entry was read into *TYPEP and *VALP. */
-void
-inf_ptrace_store_registers (struct regcache *regcache, int regnum)
+int
+inf_ptrace_target::auxv_parse (gdb_byte **readptr, gdb_byte *endptr,
+ CORE_ADDR *typep, CORE_ADDR *valp)
{
- if (regnum == -1)
- for (regnum = 0;
- regnum < gdbarch_num_regs (get_regcache_arch (regcache));
- regnum++)
- inf_ptrace_store_register (regcache, regnum);
- else
- inf_ptrace_store_register (regcache, regnum);
+ struct type *int_type = builtin_type (target_gdbarch ())->builtin_int;
+ struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
+ const int sizeof_auxv_type = TYPE_LENGTH (int_type);
+ const int sizeof_auxv_val = TYPE_LENGTH (ptr_type);
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
+ gdb_byte *ptr = *readptr;
+
+ if (endptr == ptr)
+ return 0;
+
+ if (endptr - ptr < 2 * sizeof_auxv_val)
+ return -1;
+
+ *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order);
+ ptr += sizeof_auxv_val; /* Alignment. */
+ *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order);
+ ptr += sizeof_auxv_val;
+
+ *readptr = ptr;
+ return 1;
}
-/* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be
- a function returning the offset within the user area where a
- particular register is stored. */
-
-struct target_ops *
-inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)
- (struct gdbarch *, int, int))
-{
- struct target_ops *t = inf_ptrace_target();
-
- gdb_assert (register_u_offset);
- inf_ptrace_register_u_offset = register_u_offset;
- t->to_fetch_registers = inf_ptrace_fetch_registers;
- t->to_store_registers = inf_ptrace_store_registers;
-
- return t;
-}
+#endif
+\f
projects / deliverable / binutils-gdb.git / blobdiff