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2004-10-01 Andrew Cagney <cagney@gnu.org>

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* target.c (xfer_using_stratum): Change return type to LONGEST.
	On each iteration offset, readbuf and writebuf.
	* inf-ptrace.c (inf_ptrace_xfer_partial): Simplify computation of
	partial_length, and read/modify/write predicate, update comments.
	Pass buffer.word to ptrace write.
This commit is contained in:
Andrew Cagney 2004-10-01 16:12:26 +00:00
parent 40a18ebd3a
commit cb85a95394
3 changed files with 32 additions and 17 deletions
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8
gdb/ChangeLog
View file

@ -1,3 +1,11 @@
2004-10-01 Andrew Cagney <cagney@gnu.org>
* target.c (xfer_using_stratum): Change return type to LONGEST.
On each iteration offset, readbuf and writebuf.
* inf-ptrace.c (inf_ptrace_xfer_partial): Simplify computation of
partial_length, and read/modify/write predicate, update comments.
Pass buffer.word to ptrace write.
2004-10-01 Paul N. Hilfinger <Hilfinger@gnat.com>
* symfile.c (init_filename_language_table): Add extensions for

30
gdb/inf-ptrace.c
View file

@ -514,25 +514,27 @@ inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
ULONGEST rounded_offset;
LONGEST partial_len;
/* Round the start address down to the next long word boundary. */
/* Round the start offset down to the next long word
boundary. */
rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
/* Truncate the length so that at max a single word will be
transfered. Remember, this function is required to perform
only a partial read so no more than one word should be
transfered). */
if (rounded_offset + sizeof (PTRACE_TYPE_RET) < offset + len)
partial_len = sizeof (PTRACE_TYPE_RET) - (offset - rounded_offset);
else
/* Since ptrace will transfer a single word starting at that
rounded_offset the partial_len needs to be adjusted down to
that (remember this function only does a single transfer).
Should the required length be even less, adjust it down
again. */
partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
if (partial_len > len)
partial_len = len;
if (writebuf)
{
/* Fill start and end extra bytes of buffer with existing
memory data. */
/* If OFFSET:PARTIAL_LEN is smaller than
ROUNDED_OFFSET:WORDSIZE then a read/modify write will
be needed. Read in the entire word. */
if (rounded_offset < offset
|| (partial_len + (offset - rounded_offset)
< sizeof (PTRACE_TYPE_RET)))
|| (offset + partial_len
< rounded_offset + sizeof (PTRACE_TYPE_RET)))
/* Need part of initial word -- fetch it. */
buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid),
(PTRACE_TYPE_ARG3) (long) rounded_offset,
@ -545,7 +547,7 @@ inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
errno = 0;
ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
(PTRACE_TYPE_ARG3) (long) rounded_offset,
(int) buffer.byte);
buffer.word);
if (errno)
{
/* Using the appropriate one (I or D) is necessary for
@ -553,7 +555,7 @@ inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
errno = 0;
ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
(PTRACE_TYPE_ARG3) (long) rounded_offset,
(int) buffer.byte);
buffer.word);
if (errno)
return 0;
}

11
gdb/target.c
View file

@ -927,9 +927,9 @@ target_xfer_partial (struct target_ops *ops,
implementing another singluar mechanism (for instance, a generic
object:annex onto inferior:object:annex say). */
static int
static LONGEST
xfer_using_stratum (enum target_object object, const char *annex,
CORE_ADDR memaddr, int len, void *readbuf,
ULONGEST offset, LONGEST len, void *readbuf,
const void *writebuf)
{
LONGEST xfered;
@ -946,7 +946,7 @@ xfer_using_stratum (enum target_object object, const char *annex,
while (1)
{
xfered = target_xfer_partial (target, object, annex,
readbuf, writebuf, memaddr, len);
readbuf, writebuf, offset, len);
if (xfered > 0)
{
/* The partial xfer succeeded, update the counts, check that
@ -955,6 +955,11 @@ xfer_using_stratum (enum target_object object, const char *annex,
len -= xfered;
if (len <= 0)
return 0;
offset += xfered;
if (readbuf != NULL)
readbuf = (bfd_byte *) readbuf + xfered;
if (writebuf != NULL)
writebuf = (bfd_byte *) writebuf + xfered;
target = target_stack;
}
else if (xfered < 0)