280 lines
6.6 KiB
C++
280 lines
6.6 KiB
C++
/* Shared utility routines for GDB to interact with agent.
|
|
|
|
Copyright (C) 2009-2022 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 "common-defs.h"
|
|
#include "target/target.h"
|
|
#include "gdbsupport/symbol.h"
|
|
#include <unistd.h>
|
|
#include "filestuff.h"
|
|
|
|
#define IPA_SYM_STRUCT_NAME ipa_sym_addresses_common
|
|
#include "agent.h"
|
|
|
|
bool debug_agent = false;
|
|
|
|
/* A stdarg wrapper for debug_vprintf. */
|
|
|
|
static void ATTRIBUTE_PRINTF (1, 2)
|
|
debug_agent_printf (const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
if (!debug_agent)
|
|
return;
|
|
va_start (ap, fmt);
|
|
debug_vprintf (fmt, ap);
|
|
va_end (ap);
|
|
}
|
|
|
|
#define DEBUG_AGENT debug_agent_printf
|
|
|
|
/* Global flag to determine using agent or not. */
|
|
bool use_agent = false;
|
|
|
|
/* Addresses of in-process agent's symbols both GDB and GDBserver cares
|
|
about. */
|
|
|
|
struct ipa_sym_addresses_common
|
|
{
|
|
CORE_ADDR addr_helper_thread_id;
|
|
CORE_ADDR addr_cmd_buf;
|
|
CORE_ADDR addr_capability;
|
|
};
|
|
|
|
/* Cache of the helper thread id. FIXME: this global should be made
|
|
per-process. */
|
|
static uint32_t helper_thread_id = 0;
|
|
|
|
static struct
|
|
{
|
|
const char *name;
|
|
int offset;
|
|
} symbol_list[] = {
|
|
IPA_SYM(helper_thread_id),
|
|
IPA_SYM(cmd_buf),
|
|
IPA_SYM(capability),
|
|
};
|
|
|
|
static struct ipa_sym_addresses_common ipa_sym_addrs;
|
|
|
|
static bool all_agent_symbols_looked_up = false;
|
|
|
|
bool
|
|
agent_loaded_p (void)
|
|
{
|
|
return all_agent_symbols_looked_up;
|
|
}
|
|
|
|
/* Look up all symbols needed by agent. Return 0 if all the symbols are
|
|
found, return non-zero otherwise. */
|
|
|
|
int
|
|
agent_look_up_symbols (void *arg)
|
|
{
|
|
all_agent_symbols_looked_up = false;
|
|
|
|
for (int i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++)
|
|
{
|
|
CORE_ADDR *addrp =
|
|
(CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset);
|
|
struct objfile *objfile = (struct objfile *) arg;
|
|
|
|
if (find_minimal_symbol_address (symbol_list[i].name, addrp,
|
|
objfile) != 0)
|
|
{
|
|
DEBUG_AGENT ("symbol `%s' not found\n", symbol_list[i].name);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
all_agent_symbols_looked_up = true;
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int
|
|
agent_get_helper_thread_id (void)
|
|
{
|
|
if (helper_thread_id == 0)
|
|
{
|
|
if (target_read_uint32 (ipa_sym_addrs.addr_helper_thread_id,
|
|
&helper_thread_id))
|
|
warning (_("Error reading helper thread's id in lib"));
|
|
}
|
|
|
|
return helper_thread_id;
|
|
}
|
|
|
|
#ifdef HAVE_SYS_UN_H
|
|
#include <sys/socket.h>
|
|
#include <sys/un.h>
|
|
#define SOCK_DIR P_tmpdir
|
|
|
|
#ifndef UNIX_PATH_MAX
|
|
#define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/* Connects to synchronization socket. PID is the pid of inferior, which is
|
|
used to set up the connection socket. */
|
|
|
|
static int
|
|
gdb_connect_sync_socket (int pid)
|
|
{
|
|
#ifdef HAVE_SYS_UN_H
|
|
struct sockaddr_un addr = {};
|
|
int res, fd;
|
|
char path[UNIX_PATH_MAX];
|
|
|
|
res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", P_tmpdir, pid);
|
|
if (res >= UNIX_PATH_MAX)
|
|
return -1;
|
|
|
|
res = fd = gdb_socket_cloexec (PF_UNIX, SOCK_STREAM, 0);
|
|
if (res == -1)
|
|
{
|
|
warning (_("error opening sync socket: %s"), safe_strerror (errno));
|
|
return -1;
|
|
}
|
|
|
|
addr.sun_family = AF_UNIX;
|
|
|
|
res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path);
|
|
if (res >= UNIX_PATH_MAX)
|
|
{
|
|
warning (_("string overflow allocating socket name"));
|
|
close (fd);
|
|
return -1;
|
|
}
|
|
|
|
res = connect (fd, (struct sockaddr *) &addr, sizeof (addr));
|
|
if (res == -1)
|
|
{
|
|
warning (_("error connecting sync socket (%s): %s. "
|
|
"Make sure the directory exists and that it is writable."),
|
|
path, safe_strerror (errno));
|
|
close (fd);
|
|
return -1;
|
|
}
|
|
|
|
return fd;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
/* Execute an agent command in the inferior. PID is the value of pid of the
|
|
inferior. CMD is the buffer for command. GDB or GDBserver will store the
|
|
command into it and fetch the return result from CMD. The interaction
|
|
between GDB/GDBserver and the agent is synchronized by a synchronization
|
|
socket. Return zero if success, otherwise return non-zero. */
|
|
|
|
int
|
|
agent_run_command (int pid, const char *cmd, int len)
|
|
{
|
|
int fd;
|
|
int tid = agent_get_helper_thread_id ();
|
|
ptid_t ptid = ptid_t (pid, tid);
|
|
|
|
int ret = target_write_memory (ipa_sym_addrs.addr_cmd_buf,
|
|
(gdb_byte *) cmd, len);
|
|
|
|
if (ret != 0)
|
|
{
|
|
warning (_("unable to write"));
|
|
return -1;
|
|
}
|
|
|
|
DEBUG_AGENT ("agent: resumed helper thread\n");
|
|
|
|
/* Resume helper thread. */
|
|
target_continue_no_signal (ptid);
|
|
|
|
fd = gdb_connect_sync_socket (pid);
|
|
if (fd >= 0)
|
|
{
|
|
char buf[1] = "";
|
|
|
|
DEBUG_AGENT ("agent: signalling helper thread\n");
|
|
|
|
do
|
|
{
|
|
ret = write (fd, buf, 1);
|
|
} while (ret == -1 && errno == EINTR);
|
|
|
|
DEBUG_AGENT ("agent: waiting for helper thread's response\n");
|
|
|
|
do
|
|
{
|
|
ret = read (fd, buf, 1);
|
|
} while (ret == -1 && errno == EINTR);
|
|
|
|
close (fd);
|
|
|
|
DEBUG_AGENT ("agent: helper thread's response received\n");
|
|
}
|
|
else
|
|
return -1;
|
|
|
|
/* Need to read response with the inferior stopped. */
|
|
if (ptid != null_ptid)
|
|
{
|
|
/* Stop thread PTID. */
|
|
DEBUG_AGENT ("agent: stop helper thread\n");
|
|
target_stop_and_wait (ptid);
|
|
}
|
|
|
|
if (fd >= 0)
|
|
{
|
|
if (target_read_memory (ipa_sym_addrs.addr_cmd_buf, (gdb_byte *) cmd,
|
|
IPA_CMD_BUF_SIZE))
|
|
{
|
|
warning (_("Error reading command response"));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Each bit of it stands for a capability of agent. */
|
|
static uint32_t agent_capability = 0;
|
|
|
|
/* Return true if agent has capability AGENT_CAP, otherwise return false. */
|
|
|
|
bool
|
|
agent_capability_check (enum agent_capa agent_capa)
|
|
{
|
|
if (agent_capability == 0)
|
|
{
|
|
if (target_read_uint32 (ipa_sym_addrs.addr_capability,
|
|
&agent_capability))
|
|
warning (_("Error reading capability of agent"));
|
|
}
|
|
return (agent_capability & agent_capa) != 0;
|
|
}
|
|
|
|
/* Invalidate the cache of agent capability, so we'll read it from inferior
|
|
again. Call it when launches a new program or reconnect to remote stub. */
|
|
|
|
void
|
|
agent_capability_invalidate (void)
|
|
{
|
|
agent_capability = 0;
|
|
}
|