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gdb: move bfd_open_from_target_memory to gdb_bfd

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This function allows to create a BFD handle using an accessible memory
range in a target memory.  It is currently contained in a JIT module but
this functionality may be of wider usefullness - for example, reading
ELF binaries contained within a core dump.

gdb/ChangeLog:
2020-12-07  Mihails Strasuns  <mihails.strasuns@intel.com>

	* jit.c (mem_bfd*, bfd_open_from_target_memory): Removed.
	* gdb_bfd.h (gdb_bfd_open_from_target_memory): New function.
	* gdb_bfd.c (mem_bfd*, gdb_bfd_open_from_target_memory): New functions.
This commit is contained in:
Mihails Strasuns
2020-12-07 20:54:03 +01:00
parent c2137f55ad
commit 15cc148fb8
4 changed files with 99 additions and 83 deletions
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85
gdb/gdb_bfd.c
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@ -207,6 +207,91 @@ gdb_bfd_has_target_filename (struct bfd *abfd)
return is_target_filename (bfd_get_filename (abfd));
}
/* For `gdb_bfd_open_from_target_memory`. */
struct target_buffer
{
CORE_ADDR base;
ULONGEST size;
};
/* For `gdb_bfd_open_from_target_memory`. Opening the file is a no-op. */
static void *
mem_bfd_iovec_open (struct bfd *abfd, void *open_closure)
{
return open_closure;
}
/* For `gdb_bfd_open_from_target_memory`. Closing the file is just freeing the
base/size pair on our side. */
static int
mem_bfd_iovec_close (struct bfd *abfd, void *stream)
{
xfree (stream);
/* Zero means success. */
return 0;
}
/* For `gdb_bfd_open_from_target_memory`. For reading the file, we just need to
pass through to target_read_memory and fix up the arguments and return
values. */
static file_ptr
mem_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf,
file_ptr nbytes, file_ptr offset)
{
int err;
struct target_buffer *buffer = (struct target_buffer *) stream;
/* If this read will read all of the file, limit it to just the rest. */
if (offset + nbytes > buffer->size)
nbytes = buffer->size - offset;
/* If there are no more bytes left, we've reached EOF. */
if (nbytes == 0)
return 0;
err = target_read_memory (buffer->base + offset, (gdb_byte *) buf, nbytes);
if (err)
return -1;
return nbytes;
}
/* For `gdb_bfd_open_from_target_memory`. For statting the file, we only
support the st_size attribute. */
static int
mem_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb)
{
struct target_buffer *buffer = (struct target_buffer*) stream;
memset (sb, 0, sizeof (struct stat));
sb->st_size = buffer->size;
return 0;
}
/* See gdb_bfd.h. */
gdb_bfd_ref_ptr
gdb_bfd_open_from_target_memory (CORE_ADDR addr, ULONGEST size,
const char *target,
const char *filename)
{
struct target_buffer *buffer = XNEW (struct target_buffer);
buffer->base = addr;
buffer->size = size;
return gdb_bfd_openr_iovec (filename ? filename : "<in-memory>", target,
mem_bfd_iovec_open,
buffer,
mem_bfd_iovec_pread,
mem_bfd_iovec_close,
mem_bfd_iovec_stat);
}
/* Return the system error number corresponding to ERRNUM. */