diff options
Diffstat (limited to 'backends/loongarch_cfi.c')
-rw-r--r-- | backends/loongarch_cfi.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/backends/loongarch_cfi.c b/backends/loongarch_cfi.c new file mode 100644 index 00000000..5f3cd2c7 --- /dev/null +++ b/backends/loongarch_cfi.c @@ -0,0 +1,83 @@ +/* LoongArch ABI-specified defaults for DWARF CFI. + Copyright (C) 2023 OpenAnolis community LoongArch SIG. + Copyright (C) 2023 Loongson Technology Corporation Limted. + 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 loongarch_ +#include "libebl_CPU.h" + +/* LoongArch ELF ABI specification: +https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_register_convention +*/ +int +loongarch_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 ($r3) as setup in the previous frame. */ + DW_CFA_def_cfa, ULEB128_7 (3), ULEB128_7 (0), + + /* The Stack Pointer ($r3) is restored from CFA address by default. */ + DW_CFA_val_offset, ULEB128_7 (3), ULEB128_7 (0), + +#define SV(n) DW_CFA_same_value, ULEB128_7 (n) + /* The return address register contains the return address setup by + caller. */ + SV (1), + + /* Callee-saved registers $s0-$s7. */ + SV (23), SV (24), SV (25), SV (26), SV (27), SV (28), + SV (29), SV (30), SV (31), + + /* The Frame Pointer ($fp, $r22) */ + SV(22), + + /* Callee-saved registers $fs0-$fs7. */ + SV (56), SV (57), SV (58), SV (59), SV (60), SV (61), + SV (62), SV (63), +#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 = 1; /* ra. */ + + return 0; +} |