f33673061f
(os_fstat): Likewise. Validate fd argument. (cb_host_to_target_stat): Delete big_p arg. If HS arg is NULL, just compute target stat struct length. * syscall.c: #include "libiberty.h", <sys/types.h>, <sys/stat.h>. (ENOSYS,ENAMETOOLONG): Provide definitions if missing. (get_string): Return host errno values so they can be properly translated later. (cb_syscall): Likewise. (cb_syscall, cases open,unlink): Use get_path instead of get_string. (cb_syscall, case read): Use read_stdin for file descriptor 0. (cb_syscall, case write): Use write_stderr for file descriptor 2. (cb_syscall): Add cases for lseek, unlink, stat, fstat, time. (get_path): New function.
470 lines
11 KiB
C
470 lines
11 KiB
C
/* Remote target system call support.
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Copyright 1997 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This interface isn't intended to be specific to any particular kind
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of remote (hardware, simulator, whatever). As such, support for it
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(e.g. sim/common/callback.c) should *not* live in the simulator source
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tree, nor should it live in the gdb source tree. K&R C must be
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supported. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "ansidecl.h"
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#include "libiberty.h"
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#ifdef ANSI_PROTOTYPES
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "callback.h"
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#include "targ-vals.h"
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#ifndef ENOSYS
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#define ENOSYS EINVAL
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#endif
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#ifndef ENAMETOOLONG
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#define ENAMETOOLONG EINVAL
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#endif
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/* Maximum length of a path name. */
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#ifndef MAX_PATH_LEN
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#define MAX_PATH_LEN 1024
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#endif
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/* When doing file read/writes, do this many bytes at a time. */
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#define FILE_XFR_SIZE 4096
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/* FIXME: for now */
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#define TWORD unsigned long
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#define TADDR unsigned long
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/* Utility of cb_syscall to fetch a path name or other string from the target.
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The result is 0 for success or a host errno value. */
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static int
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get_string (cb, sc, buf, buflen, addr)
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host_callback *cb;
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CB_SYSCALL *sc;
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char *buf;
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int buflen;
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TADDR addr;
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{
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char *p, *pend;
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for (p = buf, pend = buf + buflen; p < pend; ++p, ++addr)
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{
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/* No, it isn't expected that this would cause one transaction with
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the remote target for each byte. The target could send the
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path name along with the syscall request, and cache the file
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name somewhere (or otherwise tweak this as desired). */
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unsigned int count = (*sc->read_mem) (cb, sc, addr, p, 1);
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if (count != 1)
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return EINVAL;
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if (*p == 0)
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break;
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}
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if (p == pend)
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return ENAMETOOLONG;
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return 0;
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}
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/* Utility of cb_syscall to fetch a path name.
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The buffer is malloc'd and the address is stored in BUFP.
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The result is that of get_string.
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If an error occurs, no buffer is left malloc'd. */
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static int
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get_path (cb, sc, addr, bufp)
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host_callback *cb;
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CB_SYSCALL *sc;
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TADDR addr;
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char **bufp;
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{
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char *buf = xmalloc (MAX_PATH_LEN);
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int result;
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result = get_string (cb, sc, buf, MAX_PATH_LEN, addr);
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if (result == 0)
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*bufp = buf;
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else
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free (buf);
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return result;
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}
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/* Perform a system call on behalf of the target. */
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CB_RC
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cb_syscall (cb, sc)
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host_callback *cb;
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CB_SYSCALL *sc;
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{
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/* ??? Need to consider target word size. */
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long result = 0, errcode = 0;
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switch (cb_target_to_host_syscall (cb, sc->func))
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{
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#if 0 /* FIXME: wip */
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case CB_SYS_argvlen :
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{
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/* Compute how much space is required to store the argv,envp
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strings so that the program can allocate the space and then
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call SYS_argv to fetch the values. */
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int addr_size = cb->addr_size;
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int argc,envc,arglen,envlen;
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const char **argv = cb->init_argv;
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const char **envp = cb->init_envp;
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argc = arglen = 0;
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if (argv)
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{
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for ( ; argv[argc]; ++argc)
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arglen += strlen (argv[argc]) + 1;
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}
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envc = envlen = 0;
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if (envp)
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{
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for ( ; envp[envc]; ++envc)
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envlen += strlen (envp[envc]) + 1;
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}
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result = arglen + envlen;
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break;
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}
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case CB_SYS_argv :
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{
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/* Pointer to target's buffer. */
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TADDR tbuf = sc->arg1;
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/* Buffer size. */
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int bufsize = sc->arg2;
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/* Q is the target address of where all the strings go. */
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TADDR q;
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int word_size = cb->word_size;
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int i,argc,envc,len;
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const char **argv = cb->init_argv;
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const char **envp = cb->init_envp;
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argc = 0;
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if (argv)
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{
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for ( ; argv[argc]; ++argc)
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{
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int len = strlen (argv[argc]);
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int written = (*sc->write_mem) (cb, sc, tbuf, argv[argc], len + 1);
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if (written != len)
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{
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result = -1;
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errcode = EINVAL;
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goto FinishSyscall;
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}
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tbuf = len + 1;
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}
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}
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if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1)
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{
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result = -1;
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errcode = EINVAL;
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goto FinishSyscall;
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}
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tbuf++;
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envc = 0;
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if (envp)
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{
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for ( ; envp[envc]; ++envc)
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{
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int len = strlen (envp[envc]);
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int written = (*sc->write_mem) (cb, sc, tbuf, envp[envc], len + 1);
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if (written != len)
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{
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result = -1;
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errcode = EINVAL;
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goto FinishSyscall;
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}
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tbuf = len + 1;
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}
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}
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if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1)
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{
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result = -1;
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errcode = EINVAL;
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goto FinishSyscall;
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}
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result = argc;
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sc->result2 = envc;
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break;
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}
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#endif /* wip */
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case CB_SYS_exit :
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/* Caller must catch and handle. */
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break;
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case CB_SYS_open :
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{
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char *path;
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errcode = get_path (cb, sc, sc->arg1, &path);
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if (errcode != 0)
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{
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result = -1;
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goto FinishSyscall;
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}
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result = (*cb->open) (cb, path, sc->arg2 /*, sc->arg3*/);
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free (path);
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if (result < 0)
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goto ErrorFinish;
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}
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break;
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case CB_SYS_close :
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result = (*cb->close) (cb, sc->arg1);
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if (result < 0)
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goto ErrorFinish;
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break;
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case CB_SYS_read :
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{
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/* ??? Perfect handling of error conditions may require only one
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call to cb->read. One can't assume all the data is
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contiguously stored in host memory so that would require
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malloc'ing/free'ing the space. Maybe later. */
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char buf[FILE_XFR_SIZE];
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int fd = sc->arg1;
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TADDR addr = sc->arg2;
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size_t count = sc->arg3;
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size_t bytes_read = 0;
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int bytes_written;
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while (count > 0)
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{
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if (fd == 0)
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result = (int) (*cb->read_stdin) (cb, buf,
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(count < FILE_XFR_SIZE
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? count : FILE_XFR_SIZE));
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else
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result = (int) (*cb->read) (cb, fd, buf,
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(count < FILE_XFR_SIZE
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? count : FILE_XFR_SIZE));
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if (result == -1)
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goto ErrorFinish;
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bytes_written = (*sc->write_mem) (cb, sc, addr, buf, result);
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if (bytes_written != result)
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{
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result = -1;
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errcode = EINVAL;
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goto FinishSyscall;
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}
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bytes_read += result;
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count -= result;
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addr += result;
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}
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result = bytes_read;
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}
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break;
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case CB_SYS_write :
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{
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/* ??? Perfect handling of error conditions may require only one
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call to cb->write. One can't assume all the data is
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contiguously stored in host memory so that would require
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malloc'ing/free'ing the space. Maybe later. */
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char buf[FILE_XFR_SIZE];
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int fd = sc->arg1;
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TADDR addr = sc->arg2;
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size_t count = sc->arg3;
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int bytes_read;
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size_t bytes_written = 0;
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while (count > 0)
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{
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int bytes_to_read = count < FILE_XFR_SIZE ? count : FILE_XFR_SIZE;
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bytes_read = (*sc->read_mem) (cb, sc, addr, buf, bytes_to_read);
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if (bytes_read != bytes_to_read)
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{
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result = -1;
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errcode = EINVAL;
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goto FinishSyscall;
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}
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if (fd == 1)
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result = (int) (*cb->write_stdout) (cb, buf, bytes_read);
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if (fd == 2)
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result = (int) (*cb->write_stderr) (cb, buf, bytes_read);
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else
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result = (int) (*cb->write) (cb, fd, buf, bytes_read);
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if (result == -1)
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goto ErrorFinish;
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bytes_written += result;
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count -= result;
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addr += result;
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}
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result = bytes_written;
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}
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break;
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case CB_SYS_lseek :
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{
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int fd = sc->arg1;
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unsigned long offset = sc->arg2;
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int whence = sc->arg3;
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result = (*cb->lseek) (cb, fd, offset, whence);
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if (result < 0)
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goto ErrorFinish;
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}
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break;
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case CB_SYS_unlink :
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{
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char *path;
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errcode = get_path (cb, sc, sc->arg1, &path);
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if (errcode != 0)
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{
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result = -1;
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goto FinishSyscall;
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}
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result = (*cb->unlink) (cb, path);
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free (path);
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if (result < 0)
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goto ErrorFinish;
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}
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break;
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case CB_SYS_stat :
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{
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char *path,*buf;
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int buflen;
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struct stat statbuf;
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TADDR addr = sc->arg2;
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errcode = get_path (cb, sc, sc->arg1, &path);
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if (errcode != 0)
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{
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result = -1;
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goto FinishSyscall;
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}
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result = (*cb->stat) (cb, path, &statbuf);
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free (path);
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if (result < 0)
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goto ErrorFinish;
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buflen = cb_host_to_target_stat (cb, NULL, NULL);
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buf = xmalloc (buflen);
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if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen)
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{
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/* The translation failed. This is due to an internal
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host program error, not the target's fault. */
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free (buf);
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errcode = ENOSYS;
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result = -1;
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goto FinishSyscall;
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}
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if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen)
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{
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free (buf);
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errcode = EINVAL;
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result = -1;
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goto FinishSyscall;
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}
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free (buf);
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}
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break;
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case CB_SYS_fstat :
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{
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char *buf;
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int buflen;
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struct stat statbuf;
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TADDR addr = sc->arg2;
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result = (*cb->fstat) (cb, sc->arg1, &statbuf);
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if (result < 0)
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goto ErrorFinish;
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buflen = cb_host_to_target_stat (cb, NULL, NULL);
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buf = xmalloc (buflen);
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if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen)
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{
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/* The translation failed. This is due to an internal
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host program error, not the target's fault. */
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free (buf);
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errcode = ENOSYS;
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result = -1;
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goto FinishSyscall;
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}
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if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen)
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{
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free (buf);
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errcode = EINVAL;
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result = -1;
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goto FinishSyscall;
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}
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free (buf);
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}
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break;
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case CB_SYS_time :
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{
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/* FIXME: May wish to change CB_SYS_time to something else.
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We might also want gettimeofday or times, but if system calls
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can be built on others, we can keep the number we have to support
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here down. */
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time_t t = (*cb->time) (cb, (time_t *) 0);
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result = t;
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/* It is up to target code to process the argument to time(). */
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}
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break;
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case CB_SYS_chdir :
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case CB_SYS_chmod :
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case CB_SYS_utime :
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/* fall through for now */
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default :
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result = -1;
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errcode = ENOSYS;
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break;
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}
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FinishSyscall:
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sc->result = result;
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if (errcode == 0)
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sc->errcode = 0;
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else
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sc->errcode = cb_host_to_target_errno (cb, errcode);
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return CB_RC_OK;
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ErrorFinish:
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sc->result = result;
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sc->errcode = (*cb->get_errno) (cb);
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return CB_RC_OK;
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}
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