/* Remote target system call support.
- Copyright 1997 Free Software Foundation, Inc.
+ Copyright 1997-2021 Free Software Foundation, Inc.
Contributed by Cygnus Solutions.
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 2 of the License, or
+ 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,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with GAS; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This interface isn't intended to be specific to any particular kind
of remote (hardware, simulator, whatever). As such, support for it
tree, nor should it live in the gdb source tree. K&R C must be
supported. */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* This must come before any other includes. */
+#include "defs.h"
+
#include "ansidecl.h"
#include "libiberty.h"
-#ifdef ANSI_PROTOTYPES
#include <stdarg.h>
-#else
-#include <varargs.h>
-#endif
#include <stdio.h>
-#ifdef HAVE_STDLIB_H
#include <stdlib.h>
-#endif
+#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
-#include "callback.h"
+#include "sim/callback.h"
#include "targ-vals.h"
#ifndef ENOSYS
/* When doing file read/writes, do this many bytes at a time. */
#define FILE_XFR_SIZE 4096
-/* FIXME: for now */
-#define TWORD unsigned long
+/* FIXME: for now, need to consider target word size. */
+#define TWORD long
#define TADDR unsigned long
+/* Path to be prepended to syscalls with absolute paths, and to be
+ chdir:ed at startup, if not empty. */
+char *simulator_sysroot = "";
+
/* Utility of cb_syscall to fetch a path name or other string from the target.
The result is 0 for success or a host errno value. */
-static int
-get_string (cb, sc, buf, buflen, addr)
- host_callback *cb;
- CB_SYSCALL *sc;
- char *buf;
- int buflen;
- TADDR addr;
+int
+cb_get_string (host_callback *cb, CB_SYSCALL *sc, char *buf, int buflen,
+ TADDR addr)
{
char *p, *pend;
path name along with the syscall request, and cache the file
name somewhere (or otherwise tweak this as desired). */
unsigned int count = (*sc->read_mem) (cb, sc, addr, p, 1);
-
+
if (count != 1)
return EINVAL;
if (*p == 0)
/* Utility of cb_syscall to fetch a path name.
The buffer is malloc'd and the address is stored in BUFP.
- The result is that of get_string.
+ The result is that of get_string, but prepended with
+ simulator_sysroot if the string starts with '/'.
If an error occurs, no buffer is left malloc'd. */
static int
-get_path (cb, sc, addr, bufp)
- host_callback *cb;
- CB_SYSCALL *sc;
- TADDR addr;
- char **bufp;
+get_path (host_callback *cb, CB_SYSCALL *sc, TADDR addr, char **bufp)
{
char *buf = xmalloc (MAX_PATH_LEN);
int result;
+ int sysroot_len = strlen (simulator_sysroot);
- result = get_string (cb, sc, buf, MAX_PATH_LEN, addr);
+ result = cb_get_string (cb, sc, buf, MAX_PATH_LEN - sysroot_len, addr);
if (result == 0)
- *bufp = buf;
+ {
+ /* Prepend absolute paths with simulator_sysroot. Relative paths
+ are supposed to be relative to a chdir within that path, but at
+ this point unknown where. */
+ if (simulator_sysroot[0] != '\0' && *buf == '/')
+ {
+ /* Considering expected rareness of syscalls with absolute
+ file paths (compared to relative file paths and insn
+ execution), it does not seem worthwhile to rearrange things
+ to get rid of the string moves here; we'd need at least an
+ extra call to check the initial '/' in the path. */
+ memmove (buf + sysroot_len, buf, sysroot_len);
+ memcpy (buf, simulator_sysroot, sysroot_len);
+ }
+
+ *bufp = buf;
+ }
else
free (buf);
return result;
/* Perform a system call on behalf of the target. */
CB_RC
-cb_syscall (cb, sc)
- host_callback *cb;
- CB_SYSCALL *sc;
+cb_syscall (host_callback *cb, CB_SYSCALL *sc)
{
- /* ??? Need to consider target word size. */
- long result = 0, errcode = 0;
+ TWORD result = 0, errcode = 0;
+
+ if (sc->magic != CB_SYSCALL_MAGIC)
+ abort ();
switch (cb_target_to_host_syscall (cb, sc->func))
{
#endif /* wip */
case CB_SYS_exit :
- /* Caller must catch and handle. */
+ /* Caller must catch and handle; see sim_syscall as an example. */
break;
case CB_SYS_open :
while (count > 0)
{
- if (fd == 0)
+ if (cb_is_stdin (cb, fd))
result = (int) (*cb->read_stdin) (cb, buf,
(count < FILE_XFR_SIZE
? count : FILE_XFR_SIZE));
? count : FILE_XFR_SIZE));
if (result == -1)
goto ErrorFinish;
+ if (result == 0) /* EOF */
+ break;
bytes_written = (*sc->write_mem) (cb, sc, addr, buf, result);
if (bytes_written != result)
{
bytes_read += result;
count -= result;
addr += result;
+ /* If this is a short read, don't go back for more */
+ if (result != FILE_XFR_SIZE)
+ break;
}
result = bytes_read;
}
errcode = EINVAL;
goto FinishSyscall;
}
- if (fd == 1)
- result = (int) (*cb->write_stdout) (cb, buf, bytes_read);
- if (fd == 2)
- result = (int) (*cb->write_stderr) (cb, buf, bytes_read);
+ if (cb_is_stdout (cb, fd))
+ {
+ result = (int) (*cb->write_stdout) (cb, buf, bytes_read);
+ (*cb->flush_stdout) (cb);
+ }
+ else if (cb_is_stderr (cb, fd))
+ {
+ result = (int) (*cb->write_stderr) (cb, buf, bytes_read);
+ (*cb->flush_stderr) (cb);
+ }
else
result = (int) (*cb->write) (cb, fd, buf, bytes_read);
if (result == -1)
}
break;
+ case CB_SYS_truncate :
+ {
+ char *path;
+ long len = sc->arg2;
+
+ errcode = get_path (cb, sc, sc->arg1, &path);
+ if (errcode != 0)
+ {
+ result = -1;
+ errcode = EFAULT;
+ goto FinishSyscall;
+ }
+ result = (*cb->truncate) (cb, path, len);
+ free (path);
+ if (result < 0)
+ goto ErrorFinish;
+ }
+ break;
+
+ case CB_SYS_ftruncate :
+ {
+ int fd = sc->arg1;
+ long len = sc->arg2;
+
+ result = (*cb->ftruncate) (cb, fd, len);
+ if (result < 0)
+ goto ErrorFinish;
+ }
+ break;
+
+ case CB_SYS_rename :
+ {
+ char *path1, *path2;
+
+ errcode = get_path (cb, sc, sc->arg1, &path1);
+ if (errcode != 0)
+ {
+ result = -1;
+ errcode = EFAULT;
+ goto FinishSyscall;
+ }
+ errcode = get_path (cb, sc, sc->arg2, &path2);
+ if (errcode != 0)
+ {
+ result = -1;
+ errcode = EFAULT;
+ free (path1);
+ goto FinishSyscall;
+ }
+ result = (*cb->rename) (cb, path1, path2);
+ free (path1);
+ free (path2);
+ if (result < 0)
+ goto ErrorFinish;
+ }
+ break;
+
case CB_SYS_stat :
{
char *path,*buf;
result = -1;
goto FinishSyscall;
}
- result = (*cb->stat) (cb, path, &statbuf);
+ result = (*cb->to_stat) (cb, path, &statbuf);
free (path);
if (result < 0)
goto ErrorFinish;
struct stat statbuf;
TADDR addr = sc->arg2;
- result = (*cb->fstat) (cb, sc->arg1, &statbuf);
+ result = (*cb->to_fstat) (cb, sc->arg1, &statbuf);
if (result < 0)
goto ErrorFinish;
buflen = cb_host_to_target_stat (cb, NULL, NULL);
}
break;
+ case CB_SYS_lstat :
+ {
+ char *path, *buf;
+ int buflen;
+ struct stat statbuf;
+ TADDR addr = sc->arg2;
+
+ errcode = get_path (cb, sc, sc->arg1, &path);
+ if (errcode != 0)
+ {
+ result = -1;
+ goto FinishSyscall;
+ }
+ result = (*cb->to_lstat) (cb, path, &statbuf);
+ free (path);
+ if (result < 0)
+ goto ErrorFinish;
+
+ buflen = cb_host_to_target_stat (cb, NULL, NULL);
+ buf = xmalloc (buflen);
+ if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen)
+ {
+ /* The translation failed. This is due to an internal
+ host program error, not the target's fault.
+ Unfortunately, it's hard to test this case, so there's no
+ test-case for this execution path. */
+ free (buf);
+ errcode = ENOSYS;
+ result = -1;
+ goto FinishSyscall;
+ }
+
+ if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen)
+ {
+ free (buf);
+ errcode = EINVAL;
+ result = -1;
+ goto FinishSyscall;
+ }
+
+ free (buf);
+ }
+ break;
+
+ case CB_SYS_pipe :
+ {
+ int p[2];
+ char *target_p = xcalloc (1, cb->target_sizeof_int * 2);
+
+ result = (*cb->pipe) (cb, p);
+ if (result != 0)
+ goto ErrorFinish;
+
+ cb_store_target_endian (cb, target_p, cb->target_sizeof_int, p[0]);
+ cb_store_target_endian (cb, target_p + cb->target_sizeof_int,
+ cb->target_sizeof_int, p[1]);
+ if ((*sc->write_mem) (cb, sc, sc->arg1, target_p,
+ cb->target_sizeof_int * 2)
+ != cb->target_sizeof_int * 2)
+ {
+ /* Close the pipe fd:s. */
+ (*cb->close) (cb, p[0]);
+ (*cb->close) (cb, p[1]);
+ errcode = EFAULT;
+ result = -1;
+ }
+
+ free (target_p);
+ }
+ break;
+
+ case CB_SYS_getpid:
+ /* POSIX says getpid always succeeds. */
+ result = (*cb->getpid) (cb);
+ break;
+
+ case CB_SYS_kill:
+ /* If killing self, leave it to the caller to process so it can send the
+ signal to the engine. */
+ if (sc->arg1 == (*cb->getpid) (cb))
+ {
+ result = -1;
+ errcode = ENOSYS;
+ }
+ else
+ {
+ int signum = cb_target_to_host_signal (cb, sc->arg2);
+
+ result = (*cb->kill) (cb, sc->arg1, signum);
+ cb->last_errno = errno;
+ goto ErrorFinish;
+ }
+ break;
+
case CB_SYS_time :
{
/* FIXME: May wish to change CB_SYS_time to something else.
We might also want gettimeofday or times, but if system calls
can be built on others, we can keep the number we have to support
here down. */
- time_t t = (*cb->time) (cb, (time_t *) 0);
+ time_t t = (*cb->time) (cb);
result = t;
/* It is up to target code to process the argument to time(). */
}
projects / binutils-gdb.git / blobdiff