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[PATCH 09/11] ELFv2 ABI: stack frame layout changes
- From: "Ulrich Weigand" <uweigand at de dot ibm dot com>
- To: gdb-patches at sourceware dot org
- Date: Tue, 28 Jan 2014 18:30:13 +0100 (CET)
- Subject: [PATCH 09/11] ELFv2 ABI: stack frame layout changes
- Authentication-results: sourceware.org; auth=none
Hello,
this implementes another change in ELFv2: the stack frame no longer
contains the reserved double words for linker and compiler use
(which weren't really used for much of anything anyway). This
affects placement of on-stack parameters in inferior calls.
Tested (whole series) on powerpc64-linux and powerpc64le-linux.
Bye,
Ulrich
Index: binutils-gdb/gdb/ppc-sysv-tdep.c
===================================================================
--- binutils-gdb.orig/gdb/ppc-sysv-tdep.c
+++ binutils-gdb/gdb/ppc-sysv-tdep.c
@@ -1470,9 +1470,13 @@ ppc64_sysv_abi_push_dummy_call (struct g
argpos.regcache = regcache;
argpos.refparam = align_down (sp - refparam_size, 16);
argpos.gparam = align_down (argpos.refparam - gparam_size, 16);
- /* Add in space for the TOC, link editor double word,
- compiler double word, LR save area, CR save area. */
- sp = align_down (argpos.gparam - 48, 16);
+ /* Add in space for the TOC, link editor double word (v1 only),
+ compiler double word (v1 only), LR save area, CR save area,
+ and backchain. */
+ if (tdep->elf_abi == POWERPC_ELF_V1)
+ sp = align_down (argpos.gparam - 48, 16);
+ else
+ sp = align_down (argpos.gparam - 32, 16);
}
/* If the function is returning a `struct', then there is an
--
Dr. Ulrich Weigand
GNU/Linux compilers and toolchain
Ulrich.Weigand@de.ibm.com