| /* Common Linux arch-specific functionality for AArch64 scalable |
| extensions: SVE and SME. |
| |
| Copyright (C) 2023-2024 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "arch/aarch64-scalable-linux.h" |
| #include "arch/aarch64.h" |
| #include "gdbsupport/byte-vector.h" |
| #include "gdbsupport/common-regcache.h" |
| |
| /* See arch/aarch64-scalable-linux.h */ |
| |
| bool |
| sve_state_is_empty (const struct reg_buffer_common *reg_buf) |
| { |
| /* Instead of allocating a buffer with the size of the current vector |
| length, just use a buffer that is big enough for all cases. */ |
| gdb_byte zero_buffer[256]; |
| |
| /* Zero it out. */ |
| memset (zero_buffer, 0, 256); |
| |
| /* Are any of the Z registers set (non-zero) after the first 128 bits? */ |
| for (int i = 0; i < AARCH64_SVE_Z_REGS_NUM; i++) |
| { |
| if (!reg_buf->raw_compare (AARCH64_SVE_Z0_REGNUM + i, zero_buffer, |
| V_REGISTER_SIZE)) |
| return false; |
| } |
| |
| /* Are any of the P registers set (non-zero)? */ |
| for (int i = 0; i < AARCH64_SVE_P_REGS_NUM; i++) |
| { |
| if (!reg_buf->raw_compare (AARCH64_SVE_P0_REGNUM + i, zero_buffer, 0)) |
| return false; |
| } |
| |
| /* Is the FFR register set (non-zero)? */ |
| return reg_buf->raw_compare (AARCH64_SVE_FFR_REGNUM, zero_buffer, 0); |
| } |