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Make gdb_bfd_open able to open BFDs using target fileio
This commit updates gdb_bfd_open to access files using target fileio functions if the supplied path starts with "target:" and if the local and target filesystems are not the same. This allows users to specify "set sysroot target:" and have GDB access files locally or from the remote as appropriate. The new functions in gdb_bfd.c are copies of functions from remote.c. This duplication is intentional and will be removed by the next commit in this series. gdb/ChangeLog: * gdb/gdb_bfd.h (TARGET_SYSROOT_PREFIX): New definition. (is_target_filename): New declaration. (gdb_bfd_has_target_filename): Likewise. (gdb_bfd_open): Update documentation comment. * gdb_bfd.c (target.h): New include. (gdb/fileio.h): Likewise. (is_target_filename): New function. (gdb_bfd_has_target_filename): Likewise. (fileio_errno_to_host): Likewise. (gdb_bfd_iovec_fileio_open): Likewise. (gdb_bfd_iovec_fileio_pread): Likewise. (gdb_bfd_iovec_fileio_close): Likewise. (gdb_bfd_iovec_fileio_fstat): Likewise. (gdb_bfd_open): Use target fileio to access paths prefixed with "target:" where necessary.
This commit is contained in:
Gary Benson
parent
4bd7dc4255
commit
f08e97fed1
@ -1,3 +1,21 @@
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2015-04-02 Gary Benson <gbenson@redhat.com>
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* gdb/gdb_bfd.h (TARGET_SYSROOT_PREFIX): New definition.
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(is_target_filename): New declaration.
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(gdb_bfd_has_target_filename): Likewise.
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(gdb_bfd_open): Update documentation comment.
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* gdb_bfd.c (target.h): New include.
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(gdb/fileio.h): Likewise.
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(is_target_filename): New function.
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(gdb_bfd_has_target_filename): Likewise.
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(fileio_errno_to_host): Likewise.
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(gdb_bfd_iovec_fileio_open): Likewise.
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(gdb_bfd_iovec_fileio_pread): Likewise.
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(gdb_bfd_iovec_fileio_close): Likewise.
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(gdb_bfd_iovec_fileio_fstat): Likewise.
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(gdb_bfd_open): Use target fileio to access paths prefixed
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with "target:" where necessary.
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2015-04-02 Gary Benson <gbenson@redhat.com>
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* target.h (struct target_ops) <to_filesystem_is_local>:
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203
gdb/gdb_bfd.c
203
gdb/gdb_bfd.c
@ -30,6 +30,8 @@
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#define MAP_FAILED ((void *) -1)
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#endif
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#endif
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#include "target.h"
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#include "gdb/fileio.h"
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typedef bfd *bfdp;
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DEF_VEC_P (bfdp);
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@ -138,6 +140,177 @@ eq_bfd (const void *a, const void *b)
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/* See gdb_bfd.h. */
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int
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is_target_filename (const char *name)
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{
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return startswith (name, TARGET_SYSROOT_PREFIX);
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}
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/* See gdb_bfd.h. */
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int
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gdb_bfd_has_target_filename (struct bfd *abfd)
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{
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return is_target_filename (bfd_get_filename (abfd));
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}
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/* Return the system error number corresponding to ERRNUM. */
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static int
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fileio_errno_to_host (int errnum)
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{
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switch (errnum)
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{
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case FILEIO_EPERM:
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return EPERM;
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case FILEIO_ENOENT:
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return ENOENT;
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case FILEIO_EINTR:
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return EINTR;
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case FILEIO_EIO:
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return EIO;
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case FILEIO_EBADF:
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return EBADF;
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case FILEIO_EACCES:
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return EACCES;
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case FILEIO_EFAULT:
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return EFAULT;
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case FILEIO_EBUSY:
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return EBUSY;
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case FILEIO_EEXIST:
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return EEXIST;
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case FILEIO_ENODEV:
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return ENODEV;
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case FILEIO_ENOTDIR:
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return ENOTDIR;
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case FILEIO_EISDIR:
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return EISDIR;
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case FILEIO_EINVAL:
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return EINVAL;
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case FILEIO_ENFILE:
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return ENFILE;
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case FILEIO_EMFILE:
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return EMFILE;
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case FILEIO_EFBIG:
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return EFBIG;
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case FILEIO_ENOSPC:
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return ENOSPC;
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case FILEIO_ESPIPE:
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return ESPIPE;
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case FILEIO_EROFS:
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return EROFS;
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case FILEIO_ENOSYS:
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return ENOSYS;
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case FILEIO_ENAMETOOLONG:
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return ENAMETOOLONG;
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}
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return -1;
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}
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/* Wrapper for target_fileio_open suitable for passing as the
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OPEN_FUNC argument to gdb_bfd_openr_iovec. The supplied
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OPEN_CLOSURE is unused. */
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static void *
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gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *open_closure)
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{
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const char *filename = bfd_get_filename (abfd);
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int fd, target_errno;
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int *stream;
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gdb_assert (is_target_filename (filename));
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fd = target_fileio_open (filename + strlen (TARGET_SYSROOT_PREFIX),
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FILEIO_O_RDONLY, 0,
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&target_errno);
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if (fd == -1)
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{
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errno = fileio_errno_to_host (target_errno);
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bfd_set_error (bfd_error_system_call);
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return NULL;
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}
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stream = XCNEW (int);
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*stream = fd;
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return stream;
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}
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/* Wrapper for target_fileio_pread suitable for passing as the
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PREAD_FUNC argument to gdb_bfd_openr_iovec. */
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static file_ptr
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gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf,
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file_ptr nbytes, file_ptr offset)
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{
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int fd = *(int *) stream;
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int target_errno;
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file_ptr pos, bytes;
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pos = 0;
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while (nbytes > pos)
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{
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bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos,
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nbytes - pos, offset + pos,
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&target_errno);
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if (bytes == 0)
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/* Success, but no bytes, means end-of-file. */
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break;
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if (bytes == -1)
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{
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errno = fileio_errno_to_host (target_errno);
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bfd_set_error (bfd_error_system_call);
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return -1;
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}
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pos += bytes;
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}
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return pos;
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}
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/* Wrapper for target_fileio_close suitable for passing as the
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CLOSE_FUNC argument to gdb_bfd_openr_iovec. */
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static int
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gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream)
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{
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int fd = *(int *) stream;
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int target_errno;
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xfree (stream);
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/* Ignore errors on close. These may happen with remote
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targets if the connection has already been torn down. */
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target_fileio_close (fd, &target_errno);
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/* Zero means success. */
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return 0;
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}
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/* Wrapper for target_fileio_fstat suitable for passing as the
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STAT_FUNC argument to gdb_bfd_openr_iovec. */
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static int
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gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream,
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struct stat *sb)
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{
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int fd = *(int *) stream;
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int target_errno;
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int result;
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result = target_fileio_fstat (fd, sb, &target_errno);
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if (result == -1)
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{
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errno = fileio_errno_to_host (target_errno);
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bfd_set_error (bfd_error_system_call);
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}
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return result;
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}
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/* See gdb_bfd.h. */
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struct bfd *
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gdb_bfd_open (const char *name, const char *target, int fd)
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{
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@ -147,6 +320,36 @@ gdb_bfd_open (const char *name, const char *target, int fd)
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struct gdb_bfd_cache_search search;
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struct stat st;
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if (is_target_filename (name))
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{
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if (!target_filesystem_is_local ())
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{
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gdb_assert (fd == -1);
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abfd = gdb_bfd_openr_iovec (name, target,
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gdb_bfd_iovec_fileio_open, NULL,
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gdb_bfd_iovec_fileio_pread,
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gdb_bfd_iovec_fileio_close,
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gdb_bfd_iovec_fileio_fstat);
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if (abfd != NULL || errno != ENOSYS)
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return abfd;
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/* gdb_bfd_iovec_fileio_open failed with ENOSYS. This can
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happen, for example, with vgdb (Valgrind GDB), which
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presents itself as a remote target but works on the local
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filesystem: it does not implement remote get and users
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are not expected to set gdb_sysroot. To handle this case
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we fall back to trying the local filesystem iff
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gdb_sysroot is exactly TARGET_SYSROOT_PREFIX. */
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if (gdb_sysroot == NULL
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|| strcmp (gdb_sysroot, TARGET_SYSROOT_PREFIX) != 0)
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return NULL;
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}
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name += strlen (TARGET_SYSROOT_PREFIX);
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}
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if (gdb_bfd_cache == NULL)
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gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL,
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xcalloc, xfree);
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@ -24,11 +24,32 @@
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DECLARE_REGISTRY (bfd);
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/* If supplied a path starting with this sequence, gdb_bfd_open will
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open BFDs using target fileio operations. */
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#define TARGET_SYSROOT_PREFIX "target:"
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/* Returns nonzero if NAME starts with TARGET_SYSROOT_PREFIX, zero
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otherwise. */
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int is_target_filename (const char *name);
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/* Returns nonzero if the filename associated with ABFD starts with
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TARGET_SYSROOT_PREFIX, zero otherwise. */
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int gdb_bfd_has_target_filename (struct bfd *abfd);
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/* Open a read-only (FOPEN_RB) BFD given arguments like bfd_fopen.
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Returns NULL on error. On success, returns a new reference to the
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BFD, which must be freed with gdb_bfd_unref. BFDs returned by this
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call are shared among all callers opening the same file. If FD is
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not -1, then after this call it is owned by BFD. */
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If NAME starts with TARGET_SYSROOT_PREFIX then the BFD will be
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opened using target fileio operations if necessary. Returns NULL
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on error. On success, returns a new reference to the BFD, which
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must be freed with gdb_bfd_unref. BFDs returned by this call are
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shared among all callers opening the same file. If FD is not -1,
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then after this call it is owned by BFD. If the BFD was not
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accessed using target fileio operations then the filename
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associated with the BFD and accessible with bfd_get_filename will
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not be exactly NAME but rather NAME with TARGET_SYSROOT_PREFIX
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stripped. */
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struct bfd *gdb_bfd_open (const char *name, const char *target, int fd);
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