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Fix a GDB assert failure on windows 

A GDB internal error is found on native mingw32 target.

(gdb) run
../../binutils-gdb/gdb/target.c:1483: internal-error:
target_xfer_partial: Assertion `*xfered_len > 0' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

This error was introduced by the following snippet in commit
9b409511d0

> @@ -2536,27 +2538,30 @@ windows_xfer_shared_libraries (struct target_ops *ops,
>      }
>
>    obstack_free (&obstack, NULL);
> -  return len;
> +  *xfered_len = (ULONGEST) len;
> +  return TARGET_XFER_OK;
>  }

In the original code, len is returned, which could be 0, but after that
commit, only TARGET_XFER_OK is returned, which is wrong.  If len is 0,
TARGET_XFER_EOF should be returned.  (it is 0 in enum
target_xfer_status declaration).

gdb:

2014-02-24  Yuanhui Zhang  <asmwarrior@gmail.com>

	* windows-nat.c (windows_xfer_shared_libraries): Return
	TARGET_XFER_EOF if LEN is zero to fix an assert failure when
	requested object is TARGET_OBJECT_LIBRARIES.
This commit is contained in:
Yuanhui Zhang 2014-02-24 15:22:10 +08:00 committed by Yao Qi
parent bc113b4e3e
commit 0837c97695
2 changed files with 7 additions and 1 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2014-02-24 Yuanhui Zhang <asmwarrior@gmail.com>
* windows-nat.c (windows_xfer_shared_libraries): Return
TARGET_XFER_EOF if LEN is zero to fix an assert failure when
requested object is TARGET_OBJECT_LIBRARIES.
2014-02-24 Yao Qi <yao@codesourcery.com>
* target.h (enum target_xfer_status)

2
gdb/windows-nat.c
View File

@ -2501,7 +2501,7 @@ windows_xfer_shared_libraries (struct target_ops *ops,
obstack_free (&obstack, NULL);
*xfered_len = (ULONGEST) len;
return TARGET_XFER_OK;
return len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF;
}
static enum target_xfer_status