backends: Add aarch64 abi_cfi.

Setup initial CIE values for aarch64 for use with dwarf_frame functions.
Register info prefix should be the empty string (not NULL) when not used.
Add an EM_AARCH64 testcase to tests/run-addrcfi.sh to check both issues.

Signed-off-by: Mark Wielaard <[email protected]>

5 files changed, 92 insertions, 2 deletions

diff --git a/backends/ChangeLog b/backends/ChangeLog
index 24cc63d9..2074cff3 100644
--- a/backends/ChangeLog
+++ b/backends/ChangeLog
@@ -1,3 +1,10 @@
+2014-01-03  Mark Wielaard  <[email protected]>
+
+	* Makefile.am (aarch64_SRCS): Add aarch64_cfi.c.
+	* aarch64_cfi.c: New file.
+	* aarch64_init.c (aarch64_init): Hook abi_cfi.
+	* aarch64_regs.c (aarch64_register_info): Set *prefix to "".
+
 2013-12-19  Mark Wielaard  <[email protected]>
 
 	* aarch64_init.c (aarch64_init): Hook check_special_symbol.
diff --git a/backends/Makefile.am b/backends/Makefile.am
index 8deed2f9..b8bea36b 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -83,7 +83,7 @@ libebl_arm_pic_a_SOURCES = $(arm_SRCS)
 am_libebl_arm_pic_a_OBJECTS = $(arm_SRCS:.c=.os)
 
 aarch64_SRCS = aarch64_init.c aarch64_regs.c aarch64_symbol.c	\
-	       aarch64_corenote.c aarch64_retval.c
+	       aarch64_corenote.c aarch64_retval.c aarch64_cfi.c
 libebl_aarch64_pic_a_SOURCES = $(aarch64_SRCS)
 am_libebl_aarch64_pic_a_OBJECTS = $(aarch64_SRCS:.c=.os)
 aarch64_regs_no_Wformat = yes
diff --git a/backends/aarch64_cfi.c b/backends/aarch64_cfi.c
new file mode 100644
index 00000000..acbb9b69
--- /dev/null
+++ b/backends/aarch64_cfi.c
@@ -0,0 +1,82 @@
+/* arm ABI-specified defaults for DWARF CFI.
+   Copyright (C) 2013 Red Hat, Inc.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+
+#define BACKEND aarch64_
+#include "libebl_CPU.h"
+
+
+/* ABI-specified state of DWARF CFI based on:
+
+   "DWARF for the ARM 64 bit architecture (AArch64) 1.0"
+http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
+
+   "Procedure Call Standard for the ARM 64 bit Architecture 1.0"
+http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf
+*/
+
+int
+aarch64_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
+{
+  static const uint8_t abi_cfi[] =
+    {
+      /* The initial Canonical Frame Address is the value of the
+         Stack Pointer (r31) as setup in the previous frame. */
+      DW_CFA_def_cfa, ULEB128_7 (30), ULEB128_7 (0),
+
+#define SV(n) DW_CFA_same_value, ULEB128_7 (n)
+      /* Callee-saved regs r19-r28.  */
+      SV (19), SV (20), SV (21), SV (22), SV (23),
+      SV (24), SV (25), SV (26), SV (27), SV (28),
+
+      /* The Frame Pointer (FP, r29) and Link Register (LR, r30).  */
+      SV (29), SV (30),
+
+      /* Callee-saved fpregs v8-v15.  v0 == 64.  */
+      SV (72), SV (73), SV (74), SV (75),
+      SV (76), SV (77), SV (78), SV (79),
+#undef SV
+
+      /* XXX Note: registers intentionally unused by the program,
+	 for example as a consequence of the procedure call standard
+	 should be initialized as if by DW_CFA_same_value.  */
+    };
+
+  abi_info->initial_instructions = abi_cfi;
+  abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
+  abi_info->data_alignment_factor = -4;
+
+  abi_info->return_address_register = 30; /* lr.  */
+
+  return 0;
+}
diff --git a/backends/aarch64_init.c b/backends/aarch64_init.c
index d663d402..a1a70606 100644
--- a/backends/aarch64_init.c
+++ b/backends/aarch64_init.c
@@ -57,6 +57,7 @@ aarch64_init (elf, machine, eh, ehlen)
   HOOK (eh, reloc_simple_type);
   HOOK (eh, return_value_location);
   HOOK (eh, check_special_symbol);
+  HOOK (eh, abi_cfi);
 
   return MODVERSION;
 }
diff --git a/backends/aarch64_regs.c b/backends/aarch64_regs.c
index 5952b969..aec201f3 100644
--- a/backends/aarch64_regs.c
+++ b/backends/aarch64_regs.c
@@ -57,7 +57,7 @@ aarch64_register_info (Ebl *ebl __attribute__ ((unused)),
     return s + 1;
   }
 
-  *prefix = NULL;
+  *prefix = "";
   *bits = 64;
 
   switch (regno)