| /* 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 arm_ |
| #include "libebl_CPU.h" |
| |
| |
| /* ABI-specified state of DWARF CFI based on: |
| |
| "DWARF for the ARM Architecture ABI r2.09" |
| http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040b/IHI0040B_aadwarf.pdf |
| |
| "Procedure Call Standard for the ARM Architecture ABI r2.09" |
| http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf |
| */ |
| |
| int |
| arm_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 (r13) as setup in the previous frame. */ |
| DW_CFA_def_cfa, ULEB128_7 (13), ULEB128_7 (0), |
| |
| /* The Stack Pointer (r13) is restored from CFA address by default. */ |
| DW_CFA_val_offset, ULEB128_7 (13), ULEB128_7 (0), |
| |
| #define SV(n) DW_CFA_same_value, ULEB128_7 (n) |
| /* Callee-saved regs r4-r8, r10, r11. */ |
| SV (4), SV (5), SV (6), SV (7), SV (8), SV (10), SV (11), |
| |
| /* The link register contains the return address setup by caller. */ |
| SV (14), |
| DW_CFA_register, ULEB128_7 (15), ULEB128_7 (14), /* pc = lr */ |
| #undef SV |
| |
| /* VFP S16-S31/D8-D15/Q4-Q7 are callee saved. |
| And uleb128 encoded with two bytes. */ |
| #define ULEB128_8_2(x) ((x & 0x7f) | 0x80), 0x02 |
| #define SV(n) DW_CFA_same_value, ULEB128_8_2 (n) |
| SV (264), SV (265), SV (266), SV (267), |
| SV (268), SV (269), SV (270), SV (271), |
| |
| /* 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. */ |
| }; |
| #undef ULEB128_8_2 |
| #undef SV |
| |
| 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 = 15; /* pc. */ |
| |
| return 0; |
| } |