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commit 52f548e41f085550d7740c350c1c8a239532af77
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Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
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Date: Tue Feb 4 18:41:36 2014 +0100
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PowerPC64 ELFv2 ABI: stack frame layout changes
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This implementes another change in ELFv2: the stack frame no longer
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contains the reserved double words for linker and compiler use
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(which weren't really used for much of anything anyway). This
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affects placement of on-stack parameters in inferior calls.
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gdb/ChangeLog:
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* ppc-sysv-tdep.c (ppc64_sysv_abi_push_dummy_call): Use correct
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offset to the stack parameter list for the ELFv2 ABI.
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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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@@ -1473,9 +1473,13 @@ ppc64_sysv_abi_push_dummy_call (struct g
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argpos.regcache = regcache;
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argpos.refparam = align_down (sp - refparam_size, 16);
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argpos.gparam = align_down (argpos.refparam - gparam_size, 16);
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- /* Add in space for the TOC, link editor double word,
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- compiler double word, LR save area, CR save area. */
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- sp = align_down (argpos.gparam - 48, 16);
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+ /* Add in space for the TOC, link editor double word (v1 only),
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+ compiler double word (v1 only), LR save area, CR save area,
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+ and backchain. */
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+ if (tdep->elf_abi == POWERPC_ELF_V1)
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+ sp = align_down (argpos.gparam - 48, 16);
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+ else
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+ sp = align_down (argpos.gparam - 32, 16);
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}
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/* If the function is returning a `struct', then there is an
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