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1 : : /* LoongArch ABI-specified defaults for DWARF CFI. 2 : : Copyright (C) 2023 OpenAnolis community LoongArch SIG. 3 : : Copyright (C) 2023 Loongson Technology Corporation Limted. 4 : : This file is part of elfutils. 5 : : 6 : : This file is free software; you can redistribute it and/or modify 7 : : it under the terms of either 8 : : 9 : : * the GNU Lesser General Public License as published by the Free 10 : : Software Foundation; either version 3 of the License, or (at 11 : : your option) any later version 12 : : 13 : : or 14 : : 15 : : * the GNU General Public License as published by the Free 16 : : Software Foundation; either version 2 of the License, or (at 17 : : your option) any later version 18 : : 19 : : or both in parallel, as here. 20 : : 21 : : elfutils is distributed in the hope that it will be useful, but 22 : : WITHOUT ANY WARRANTY; without even the implied warranty of 23 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 : : General Public License for more details. 25 : : 26 : : You should have received copies of the GNU General Public License and 27 : : the GNU Lesser General Public License along with this program. If 28 : : not, see <http://www.gnu.org/licenses/>. */ 29 : : 30 : : #ifdef HAVE_CONFIG_H 31 : : # include <config.h> 32 : : #endif 33 : : 34 : : #include <dwarf.h> 35 : : 36 : : #define BACKEND loongarch_ 37 : : #include "libebl_CPU.h" 38 : : 39 : : /* LoongArch ELF ABI specification: 40 : : https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_register_convention 41 : : */ 42 : : int 43 : 0 : loongarch_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info) 44 : : { 45 : 0 : static const uint8_t abi_cfi[] = 46 : : { 47 : : /* The initial Canonical Frame Address is the value of the 48 : : Stack Pointer ($r3) as setup in the previous frame. */ 49 : : DW_CFA_def_cfa, ULEB128_7 (3), ULEB128_7 (0), 50 : : 51 : : /* The Stack Pointer ($r3) is restored from CFA address by default. */ 52 : : DW_CFA_val_offset, ULEB128_7 (3), ULEB128_7 (0), 53 : : 54 : : #define SV(n) DW_CFA_same_value, ULEB128_7 (n) 55 : : /* The return address register contains the return address setup by 56 : : caller. */ 57 : : SV (1), 58 : : 59 : : /* Callee-saved registers $s0-$s7. */ 60 : : SV (23), SV (24), SV (25), SV (26), SV (27), SV (28), 61 : : SV (29), SV (30), SV (31), 62 : : 63 : : /* The Frame Pointer ($fp, $r22) */ 64 : : SV(22), 65 : : 66 : : /* Callee-saved registers $fs0-$fs7. */ 67 : : SV (56), SV (57), SV (58), SV (59), SV (60), SV (61), 68 : : SV (62), SV (63), 69 : : #undef SV 70 : : 71 : : /* XXX Note: registers intentionally unused by the program, 72 : : for example as a consequence of the procedure call standard 73 : : should be initialized as if by DW_CFA_same_value. */ 74 : : }; 75 : : 76 : 0 : abi_info->initial_instructions = abi_cfi; 77 : 0 : abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi]; 78 : 0 : abi_info->data_alignment_factor = -4; 79 : : 80 : 0 : abi_info->return_address_register = 1; /* ra. */ 81 : : 82 : 0 : return 0; 83 : : }