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authorSimon Marchi <simon.marchi@efficios.com>2020-02-13 16:27:51 -0500
committerSimon Marchi <simon.marchi@efficios.com>2020-02-13 16:27:51 -0500
commitfeacfcacaac9f7e62f467a33c4ae54c56501ed18 (patch)
tree0e083366350e9fd279bec8c7b12413c90b9f255d /gdbserver/hostio.cc
parent06b3c5bdb018262d7c09cda9d4637015c7ebe779 (diff)
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gdbserver: rename source files to .cc
For the same reasons outlined in the previous patch, this patch renames gdbserver source files to .cc. I have moved the "-x c++" switch to only those rules that require it. gdbserver/ChangeLog: * Makefile.in: Rename source files from .c to .cc. * %.c: Rename to %.cc. * configure.ac: Rename server.c to server.cc. * configure: Re-generate.
Diffstat (limited to 'gdbserver/hostio.cc')
-rw-r--r--gdbserver/hostio.cc620
1 files changed, 620 insertions, 0 deletions
diff --git a/gdbserver/hostio.cc b/gdbserver/hostio.cc
new file mode 100644
index 0000000..8af4fbf
--- /dev/null
+++ b/gdbserver/hostio.cc
@@ -0,0 +1,620 @@
+/* Host file transfer support for gdbserver.
+ Copyright (C) 2007-2020 Free Software Foundation, Inc.
+
+ Contributed by CodeSourcery.
+
+ 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 "server.h"
+#include "gdb/fileio.h"
+#include "hostio.h"
+
+#include <fcntl.h>
+#include <limits.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "gdbsupport/fileio.h"
+
+struct fd_list
+{
+ int fd;
+ struct fd_list *next;
+};
+
+static struct fd_list *open_fds;
+
+static int
+safe_fromhex (char a, int *nibble)
+{
+ if (a >= '0' && a <= '9')
+ *nibble = a - '0';
+ else if (a >= 'a' && a <= 'f')
+ *nibble = a - 'a' + 10;
+ else if (a >= 'A' && a <= 'F')
+ *nibble = a - 'A' + 10;
+ else
+ return -1;
+
+ return 0;
+}
+
+/* Filenames are hex encoded, so the maximum we can handle is half the
+ packet buffer size. Cap to PATH_MAX, if it is shorter. */
+#if !defined (PATH_MAX) || (PATH_MAX > (PBUFSIZ / 2 + 1))
+# define HOSTIO_PATH_MAX (PBUFSIZ / 2 + 1)
+#else
+# define HOSTIO_PATH_MAX PATH_MAX
+#endif
+
+static int
+require_filename (char **pp, char *filename)
+{
+ int count;
+ char *p;
+
+ p = *pp;
+ count = 0;
+
+ while (*p && *p != ',')
+ {
+ int nib1, nib2;
+
+ /* Don't allow overflow. */
+ if (count >= HOSTIO_PATH_MAX - 1)
+ return -1;
+
+ if (safe_fromhex (p[0], &nib1)
+ || safe_fromhex (p[1], &nib2))
+ return -1;
+
+ filename[count++] = nib1 * 16 + nib2;
+ p += 2;
+ }
+
+ filename[count] = '\0';
+ *pp = p;
+ return 0;
+}
+
+static int
+require_int (char **pp, int *value)
+{
+ char *p;
+ int count, firstdigit;
+
+ p = *pp;
+ *value = 0;
+ count = 0;
+ firstdigit = -1;
+
+ while (*p && *p != ',')
+ {
+ int nib;
+
+ if (safe_fromhex (p[0], &nib))
+ return -1;
+
+ if (firstdigit == -1)
+ firstdigit = nib;
+
+ /* Don't allow overflow. */
+ if (count >= 8 || (count == 7 && firstdigit >= 0x8))
+ return -1;
+
+ *value = *value * 16 + nib;
+ p++;
+ count++;
+ }
+
+ *pp = p;
+ return 0;
+}
+
+static int
+require_data (char *p, int p_len, char **data, int *data_len)
+{
+ int input_index, output_index, escaped;
+
+ *data = (char *) xmalloc (p_len);
+
+ output_index = 0;
+ escaped = 0;
+ for (input_index = 0; input_index < p_len; input_index++)
+ {
+ char b = p[input_index];
+
+ if (escaped)
+ {
+ (*data)[output_index++] = b ^ 0x20;
+ escaped = 0;
+ }
+ else if (b == '}')
+ escaped = 1;
+ else
+ (*data)[output_index++] = b;
+ }
+
+ if (escaped)
+ {
+ free (*data);
+ return -1;
+ }
+
+ *data_len = output_index;
+ return 0;
+}
+
+static int
+require_comma (char **pp)
+{
+ if (**pp == ',')
+ {
+ (*pp)++;
+ return 0;
+ }
+ else
+ return -1;
+}
+
+static int
+require_end (char *p)
+{
+ if (*p == '\0')
+ return 0;
+ else
+ return -1;
+}
+
+static int
+require_valid_fd (int fd)
+{
+ struct fd_list *fd_ptr;
+
+ for (fd_ptr = open_fds; fd_ptr != NULL; fd_ptr = fd_ptr->next)
+ if (fd_ptr->fd == fd)
+ return 0;
+
+ return -1;
+}
+
+/* Fill in own_buf with the last hostio error packet, however it
+ suitable for the target. */
+static void
+hostio_error (char *own_buf)
+{
+ the_target->hostio_last_error (own_buf);
+}
+
+static void
+hostio_packet_error (char *own_buf)
+{
+ sprintf (own_buf, "F-1,%x", FILEIO_EINVAL);
+}
+
+static void
+hostio_reply (char *own_buf, int result)
+{
+ sprintf (own_buf, "F%x", result);
+}
+
+static int
+hostio_reply_with_data (char *own_buf, char *buffer, int len,
+ int *new_packet_len)
+{
+ int input_index, output_index, out_maxlen;
+
+ sprintf (own_buf, "F%x;", len);
+ output_index = strlen (own_buf);
+
+ out_maxlen = PBUFSIZ;
+
+ for (input_index = 0; input_index < len; input_index++)
+ {
+ char b = buffer[input_index];
+
+ if (b == '$' || b == '#' || b == '}' || b == '*')
+ {
+ /* These must be escaped. */
+ if (output_index + 2 > out_maxlen)
+ break;
+ own_buf[output_index++] = '}';
+ own_buf[output_index++] = b ^ 0x20;
+ }
+ else
+ {
+ if (output_index + 1 > out_maxlen)
+ break;
+ own_buf[output_index++] = b;
+ }
+ }
+
+ *new_packet_len = output_index;
+ return input_index;
+}
+
+/* Process ID of inferior whose filesystem hostio functions
+ that take FILENAME arguments will use. Zero means to use
+ our own filesystem. */
+
+static int hostio_fs_pid;
+
+/* See hostio.h. */
+
+void
+hostio_handle_new_gdb_connection (void)
+{
+ hostio_fs_pid = 0;
+}
+
+/* Handle a "vFile:setfs:" packet. */
+
+static void
+handle_setfs (char *own_buf)
+{
+ char *p;
+ int pid;
+
+ /* If the target doesn't have any of the in-filesystem-of methods
+ then there's no point in GDB sending "vFile:setfs:" packets. We
+ reply with an empty packet (i.e. we pretend we don't understand
+ "vFile:setfs:") and that should stop GDB sending any more. */
+ if (the_target->multifs_open == NULL
+ && the_target->multifs_unlink == NULL
+ && the_target->multifs_readlink == NULL)
+ {
+ own_buf[0] = '\0';
+ return;
+ }
+
+ p = own_buf + strlen ("vFile:setfs:");
+
+ if (require_int (&p, &pid)
+ || pid < 0
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ hostio_fs_pid = pid;
+
+ hostio_reply (own_buf, 0);
+}
+
+static void
+handle_open (char *own_buf)
+{
+ char filename[HOSTIO_PATH_MAX];
+ char *p;
+ int fileio_flags, fileio_mode, flags, fd;
+ mode_t mode;
+ struct fd_list *new_fd;
+
+ p = own_buf + strlen ("vFile:open:");
+
+ if (require_filename (&p, filename)
+ || require_comma (&p)
+ || require_int (&p, &fileio_flags)
+ || require_comma (&p)
+ || require_int (&p, &fileio_mode)
+ || require_end (p)
+ || fileio_to_host_openflags (fileio_flags, &flags)
+ || fileio_to_host_mode (fileio_mode, &mode))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ /* We do not need to convert MODE, since the fileio protocol
+ uses the standard values. */
+ if (hostio_fs_pid != 0 && the_target->multifs_open != NULL)
+ fd = the_target->multifs_open (hostio_fs_pid, filename,
+ flags, mode);
+ else
+ fd = open (filename, flags, mode);
+
+ if (fd == -1)
+ {
+ hostio_error (own_buf);
+ return;
+ }
+
+ /* Record the new file descriptor. */
+ new_fd = XNEW (struct fd_list);
+ new_fd->fd = fd;
+ new_fd->next = open_fds;
+ open_fds = new_fd;
+
+ hostio_reply (own_buf, fd);
+}
+
+static void
+handle_pread (char *own_buf, int *new_packet_len)
+{
+ int fd, ret, len, offset, bytes_sent;
+ char *p, *data;
+ static int max_reply_size = -1;
+
+ p = own_buf + strlen ("vFile:pread:");
+
+ if (require_int (&p, &fd)
+ || require_comma (&p)
+ || require_valid_fd (fd)
+ || require_int (&p, &len)
+ || require_comma (&p)
+ || require_int (&p, &offset)
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ /* Do not attempt to read more than the maximum number of bytes
+ hostio_reply_with_data can fit in a packet. We may still read
+ too much because of escaping, but this is handled below. */
+ if (max_reply_size == -1)
+ {
+ sprintf (own_buf, "F%x;", PBUFSIZ);
+ max_reply_size = PBUFSIZ - strlen (own_buf);
+ }
+ if (len > max_reply_size)
+ len = max_reply_size;
+
+ data = (char *) xmalloc (len);
+#ifdef HAVE_PREAD
+ ret = pread (fd, data, len, offset);
+#else
+ ret = -1;
+#endif
+ /* If we have no pread or it failed for this file, use lseek/read. */
+ if (ret == -1)
+ {
+ ret = lseek (fd, offset, SEEK_SET);
+ if (ret != -1)
+ ret = read (fd, data, len);
+ }
+
+ if (ret == -1)
+ {
+ hostio_error (own_buf);
+ free (data);
+ return;
+ }
+
+ bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len);
+
+ /* If we were using read, and the data did not all fit in the reply,
+ we would have to back up using lseek here. With pread it does
+ not matter. But we still have a problem; the return value in the
+ packet might be wrong, so we must fix it. This time it will
+ definitely fit. */
+ if (bytes_sent < ret)
+ bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent,
+ new_packet_len);
+
+ free (data);
+}
+
+static void
+handle_pwrite (char *own_buf, int packet_len)
+{
+ int fd, ret, len, offset;
+ char *p, *data;
+
+ p = own_buf + strlen ("vFile:pwrite:");
+
+ if (require_int (&p, &fd)
+ || require_comma (&p)
+ || require_valid_fd (fd)
+ || require_int (&p, &offset)
+ || require_comma (&p)
+ || require_data (p, packet_len - (p - own_buf), &data, &len))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+#ifdef HAVE_PWRITE
+ ret = pwrite (fd, data, len, offset);
+#else
+ ret = -1;
+#endif
+ /* If we have no pwrite or it failed for this file, use lseek/write. */
+ if (ret == -1)
+ {
+ ret = lseek (fd, offset, SEEK_SET);
+ if (ret != -1)
+ ret = write (fd, data, len);
+ }
+
+ if (ret == -1)
+ {
+ hostio_error (own_buf);
+ free (data);
+ return;
+ }
+
+ hostio_reply (own_buf, ret);
+ free (data);
+}
+
+static void
+handle_fstat (char *own_buf, int *new_packet_len)
+{
+ int fd, bytes_sent;
+ char *p;
+ struct stat st;
+ struct fio_stat fst;
+
+ p = own_buf + strlen ("vFile:fstat:");
+
+ if (require_int (&p, &fd)
+ || require_valid_fd (fd)
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ if (fstat (fd, &st) == -1)
+ {
+ hostio_error (own_buf);
+ return;
+ }
+
+ host_to_fileio_stat (&st, &fst);
+
+ bytes_sent = hostio_reply_with_data (own_buf,
+ (char *) &fst, sizeof (fst),
+ new_packet_len);
+
+ /* If the response does not fit into a single packet, do not attempt
+ to return a partial response, but simply fail. */
+ if (bytes_sent < sizeof (fst))
+ write_enn (own_buf);
+}
+
+static void
+handle_close (char *own_buf)
+{
+ int fd, ret;
+ char *p;
+ struct fd_list **open_fd_p, *old_fd;
+
+ p = own_buf + strlen ("vFile:close:");
+
+ if (require_int (&p, &fd)
+ || require_valid_fd (fd)
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ ret = close (fd);
+
+ if (ret == -1)
+ {
+ hostio_error (own_buf);
+ return;
+ }
+
+ open_fd_p = &open_fds;
+ /* We know that fd is in the list, thanks to require_valid_fd. */
+ while ((*open_fd_p)->fd != fd)
+ open_fd_p = &(*open_fd_p)->next;
+
+ old_fd = *open_fd_p;
+ *open_fd_p = (*open_fd_p)->next;
+ free (old_fd);
+
+ hostio_reply (own_buf, ret);
+}
+
+static void
+handle_unlink (char *own_buf)
+{
+ char filename[HOSTIO_PATH_MAX];
+ char *p;
+ int ret;
+
+ p = own_buf + strlen ("vFile:unlink:");
+
+ if (require_filename (&p, filename)
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ if (hostio_fs_pid != 0 && the_target->multifs_unlink != NULL)
+ ret = the_target->multifs_unlink (hostio_fs_pid, filename);
+ else
+ ret = unlink (filename);
+
+ if (ret == -1)
+ {
+ hostio_error (own_buf);
+ return;
+ }
+
+ hostio_reply (own_buf, ret);
+}
+
+static void
+handle_readlink (char *own_buf, int *new_packet_len)
+{
+ char filename[HOSTIO_PATH_MAX], linkname[HOSTIO_PATH_MAX];
+ char *p;
+ int ret, bytes_sent;
+
+ p = own_buf + strlen ("vFile:readlink:");
+
+ if (require_filename (&p, filename)
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ if (hostio_fs_pid != 0 && the_target->multifs_readlink != NULL)
+ ret = the_target->multifs_readlink (hostio_fs_pid, filename,
+ linkname,
+ sizeof (linkname) - 1);
+ else
+ ret = readlink (filename, linkname, sizeof (linkname) - 1);
+
+ if (ret == -1)
+ {
+ hostio_error (own_buf);
+ return;
+ }
+
+ bytes_sent = hostio_reply_with_data (own_buf, linkname, ret, new_packet_len);
+
+ /* If the response does not fit into a single packet, do not attempt
+ to return a partial response, but simply fail. */
+ if (bytes_sent < ret)
+ sprintf (own_buf, "F-1,%x", FILEIO_ENAMETOOLONG);
+}
+
+/* Handle all the 'F' file transfer packets. */
+
+int
+handle_vFile (char *own_buf, int packet_len, int *new_packet_len)
+{
+ if (startswith (own_buf, "vFile:open:"))
+ handle_open (own_buf);
+ else if (startswith (own_buf, "vFile:pread:"))
+ handle_pread (own_buf, new_packet_len);
+ else if (startswith (own_buf, "vFile:pwrite:"))
+ handle_pwrite (own_buf, packet_len);
+ else if (startswith (own_buf, "vFile:fstat:"))
+ handle_fstat (own_buf, new_packet_len);
+ else if (startswith (own_buf, "vFile:close:"))
+ handle_close (own_buf);
+ else if (startswith (own_buf, "vFile:unlink:"))
+ handle_unlink (own_buf);
+ else if (startswith (own_buf, "vFile:readlink:"))
+ handle_readlink (own_buf, new_packet_len);
+ else if (startswith (own_buf, "vFile:setfs:"))
+ handle_setfs (own_buf);
+ else
+ return 0;
+
+ return 1;
+}