LCOV - code coverage report
Current view: top level - backends - arm_cfi.c (source / functions) Hit Total Coverage
Test: elfutils-0.179 Lines: 7 7 100.0 %
Date: 2020-03-30 14:24:38 Functions: 1 1 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* arm ABI-specified defaults for DWARF CFI.
       2             :    Copyright (C) 2013 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include <dwarf.h>
      34             : 
      35             : #define BACKEND arm_
      36             : #include "libebl_CPU.h"
      37             : 
      38             : 
      39             : /* ABI-specified state of DWARF CFI based on:
      40             : 
      41             :    "DWARF for the ARM Architecture ABI r2.09"
      42             : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040b/IHI0040B_aadwarf.pdf
      43             : 
      44             :    "Procedure Call Standard for the ARM Architecture ABI r2.09"
      45             : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf
      46             : */
      47             : 
      48             : int
      49           2 : arm_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
      50             : {
      51           2 :   static const uint8_t abi_cfi[] =
      52             :     {
      53             :       /* The initial Canonical Frame Address is the value of the
      54             :          Stack Pointer (r13) as setup in the previous frame. */
      55             :       DW_CFA_def_cfa, ULEB128_7 (13), ULEB128_7 (0),
      56             : 
      57             :       /* The Stack Pointer (r13) is restored from CFA address by default.  */
      58             :       DW_CFA_val_offset, ULEB128_7 (13), ULEB128_7 (0),
      59             : 
      60             : #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
      61             :       /* Callee-saved regs r4-r8, r10, r11.  */
      62             :       SV (4), SV (5), SV (6), SV (7), SV (8), SV (10), SV (11),
      63             : 
      64             :       /* The link register contains the return address setup by caller.  */
      65             :       SV (14),
      66             :       DW_CFA_register, ULEB128_7 (15), ULEB128_7 (14), /* pc = lr */
      67             : #undef SV
      68             : 
      69             :       /* VFP S16-S31/D8-D15/Q4-Q7 are callee saved.
      70             :          And uleb128 encoded with two bytes.  */
      71             : #define ULEB128_8_2(x) ((x & 0x7f) | 0x80), 0x02
      72             : #define SV(n) DW_CFA_same_value, ULEB128_8_2 (n)
      73             :       SV (264), SV (265), SV (266), SV (267),
      74             :       SV (268), SV (269), SV (270), SV (271),
      75             : 
      76             :       /* XXX Note: registers intentionally unused by the program,
      77             :          for example as a consequence of the procedure call standard
      78             :          should be initialized as if by DW_CFA_same_value.  */
      79             :     };
      80             : #undef ULEB128_8_2
      81             : #undef SV
      82             : 
      83           2 :   abi_info->initial_instructions = abi_cfi;
      84           2 :   abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
      85           2 :   abi_info->data_alignment_factor = 4;
      86             : 
      87           2 :   abi_info->return_address_register = 15; /* pc.  */
      88             : 
      89           2 :   return 0;
      90             : }

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