| /* This testcase is part of GDB, the GNU debugger. |
| |
| Copyright 2023-2024 Free Software Foundation, Inc. |
| |
| 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/>. */ |
| |
| /* AArch64 SVE feature check. This test serves as a way for the GDB testsuite |
| to verify that a target supports SVE at runtime, and also reports data |
| about the various supported SVE vector lengths. */ |
| |
| #include <stdio.h> |
| #include <sys/auxv.h> |
| #include <sys/prctl.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #ifndef HWCAP_SVE |
| #define HWCAP_SVE (1 << 22) |
| #endif |
| |
| #ifndef PR_SVE_SET_VL |
| #define PR_SVE_SET_VL 50 |
| #define PR_SVE_GET_VL 51 |
| #define PR_SVE_VL_LEN_MASK 0xffff |
| #endif |
| |
| static int get_vl_size () |
| { |
| int res = prctl (PR_SVE_GET_VL, 0, 0, 0, 0); |
| |
| if (res < 0) |
| return -1; |
| |
| return (res & PR_SVE_VL_LEN_MASK); |
| } |
| |
| static int set_vl_size (int new_vl) |
| { |
| if (prctl (PR_SVE_SET_VL, new_vl, 0, 0, 0, 0) < 0) |
| return -1; |
| |
| if (get_vl_size () != new_vl) |
| return -1; |
| |
| return 0; |
| } |
| |
| static void |
| dummy () |
| { |
| } |
| |
| #define VL_MIN 16 |
| #define VL_MAX 256 |
| #define VL_INCREMENT 16 |
| |
| int |
| main (int argc, char **argv) |
| { |
| /* Number of supported SVE vector lengths. */ |
| size_t supported_vl_count = 0; |
| /* Vector containing the various supported SVE vector lengths. */ |
| size_t supported_vl[16]; |
| |
| if (getauxval (AT_HWCAP) & HWCAP_SVE) |
| { |
| for (int vl = VL_MIN; vl <= VL_MAX; vl += VL_INCREMENT) |
| { |
| if (set_vl_size (vl) == 0) |
| { |
| supported_vl[supported_vl_count] = vl; |
| supported_vl_count++; |
| } |
| } |
| } |
| |
| return 0; /* stop here */ |
| } |