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 arm_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info) 50 { 51 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 abi_info->initial_instructions = abi_cfi; 84 abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi]; 85 abi_info->data_alignment_factor = 4; 86 87 abi_info->return_address_register = 15; /* pc. */ 88 89 return 0; 90 } 91
