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PowerPC64 little-endian fixes: structure passing

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When passing a small structure in a GPR, the ABI specifies that it
should be passed in the least-significant bytes of the register
(or stack slot).  On big-endian systems, this means the value
needs to be stored at an offset, which is what current code does.

However, on little-endian systems, the least-significant bytes are
addresses with offset 0.  This patch fixes that.

gdb/ChangeLog:

	* ppc-sysv-tdep.c (ppc64_sysv_abi_push_val): Use correct
	offset on little-endian when passing small structures.
This commit is contained in:
Ulrich Weigand
2014-02-04 18:26:26 +01:00
parent e765b44c38
commit d63167affc
2 changed files with 7 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2014-02-04 Ulrich Weigand  <uweigand@de.ibm.com>
* ppc-sysv-tdep.c (ppc64_sysv_abi_push_val): Use correct
offset on little-endian when passing small structures.
2014-02-04 Ulrich Weigand  <uweigand@de.ibm.com> 2014-02-04 Ulrich Weigand  <uweigand@de.ibm.com>
* ppc-sysv-tdep.c (get_decimal_float_return_value): Update comment. * ppc-sysv-tdep.c (get_decimal_float_return_value): Update comment.

3
gdb/ppc-sysv-tdep.c
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@ -1150,7 +1150,8 @@ ppc64_sysv_abi_push_val (struct gdbarch *gdbarch,
doubleword are right-aligned and those larger are left-aligned. doubleword are right-aligned and those larger are left-aligned.
GCC versions before 3.4 implemented this incorrectly; see GCC versions before 3.4 implemented this incorrectly; see
<http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */ <http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */
if (len < tdep->wordsize) if (len < tdep->wordsize
&& gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
offset = tdep->wordsize - len; offset = tdep->wordsize - len;
if (argpos->regcache) if (argpos->regcache)