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commit d63167affc2a56189e3ba2cc47dd9a3451208b59
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Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
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Date: Tue Feb 4 18:26:26 2014 +0100
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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
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should be passed in the least-significant bytes of the register
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(or stack slot). On big-endian systems, this means the value
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needs to be stored at an offset, which is what current code does.
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However, on little-endian systems, the least-significant bytes are
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addresses with offset 0. This patch fixes that.
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gdb/ChangeLog:
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* ppc-sysv-tdep.c (ppc64_sysv_abi_push_val): Use correct
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offset on little-endian when passing small structures.
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Index: gdb-7.6.1/gdb/ppc-sysv-tdep.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/ppc-sysv-tdep.c
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+++ gdb-7.6.1/gdb/ppc-sysv-tdep.c
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@@ -1149,7 +1149,8 @@ ppc64_sysv_abi_push_val (struct gdbarch
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doubleword are right-aligned and those larger are left-aligned.
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GCC versions before 3.4 implemented this incorrectly; see
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<http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */
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- if (len < tdep->wordsize)
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+ if (len < tdep->wordsize
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+ && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
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offset = tdep->wordsize - len;
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if (argpos->regcache)
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