| 1 | /* |
| 2 | * Copyright(c) 2021-2023 Qualcomm Innovation Center, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <stdlib.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdint.h> |
| 21 | #include <unistd.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <fcntl.h> |
| 24 | #include <setjmp.h> |
| 25 | #include <signal.h> |
| 26 | |
| 27 | int err; |
| 28 | |
| 29 | #include "hex_test.h" |
| 30 | |
| 31 | static int32_t satub(int32_t src, int32_t *p, bool *ovf_result) |
| 32 | { |
| 33 | int32_t result; |
| 34 | uint32_t usr; |
| 35 | |
| 36 | /* |
| 37 | * This instruction can set bit 0 (OVF/overflow) in usr |
| 38 | * Clear the bit first, then return that bit to the caller |
| 39 | * |
| 40 | * We also store the src into *p in the same packet, so we |
| 41 | * can ensure the overflow doesn't get set when an exception |
| 42 | * is generated. |
| 43 | */ |
| 44 | asm volatile("r2 = usr\n\t" |
| 45 | "r2 = clrbit(r2, #0)\n\t" /* clear overflow bit */ |
| 46 | "usr = r2\n\t" |
| 47 | "{\n\t" |
| 48 | " %0 = satub(%2)\n\t" |
| 49 | " memw(%3) = %2\n\t" |
| 50 | "}\n\t" |
| 51 | "%1 = usr\n\t" |
| 52 | : "=r"(result), "=r"(usr) |
| 53 | : "r"(src), "r"(p) |
| 54 | : "r2", "usr", "memory"); |
| 55 | *ovf_result = (usr & 1); |
| 56 | return result; |
| 57 | } |
| 58 | |
| 59 | bool read_usr_overflow(void) |
| 60 | { |
| 61 | uint32_t usr; |
| 62 | asm volatile("%0 = usr\n\t" : "=r"(usr)); |
| 63 | return usr & 1; |
| 64 | } |
| 65 | |
| 66 | bool get_usr_overflow(uint32_t usr) |
| 67 | { |
| 68 | return usr & 1; |
| 69 | } |
| 70 | |
| 71 | bool get_usr_fp_invalid(uint32_t usr) |
| 72 | { |
| 73 | return (usr >> 1) & 1; |
| 74 | } |
| 75 | |
| 76 | int32_t get_usr_lpcfg(uint32_t usr) |
| 77 | { |
| 78 | return (usr >> 8) & 0x3; |
| 79 | } |
| 80 | |
| 81 | jmp_buf jmp_env; |
| 82 | bool usr_overflow; |
| 83 | |
| 84 | static void sig_segv(int sig, siginfo_t *info, void *puc) |
| 85 | { |
| 86 | usr_overflow = read_usr_overflow(); |
| 87 | longjmp(jmp_env, 1); |
| 88 | } |
| 89 | |
| 90 | static void test_packet(void) |
| 91 | { |
| 92 | int32_t convres; |
| 93 | int32_t satres; |
| 94 | uint32_t usr; |
| 95 | |
| 96 | asm("r2 = usr\n\t" |
| 97 | "r2 = clrbit(r2, #0)\n\t" /* clear overflow bit */ |
| 98 | "r2 = clrbit(r2, #1)\n\t" /* clear FP invalid bit */ |
| 99 | "usr = r2\n\t" |
| 100 | "{\n\t" |
| 101 | " %0 = convert_sf2uw(%3):chop\n\t" |
| 102 | " %1 = satb(%4)\n\t" |
| 103 | "}\n\t" |
| 104 | "%2 = usr\n\t" |
| 105 | : "=r"(convres), "=r"(satres), "=r"(usr) |
| 106 | : "r"(0x6a051b86), "r"(0x0410eec0) |
| 107 | : "r2", "usr"); |
| 108 | |
| 109 | check32(convres, 0xffffffff); |
| 110 | check32(satres, 0x7f); |
| 111 | check32(get_usr_overflow(usr), true); |
| 112 | check32(get_usr_fp_invalid(usr), true); |
| 113 | |
| 114 | asm("r2 = usr\n\t" |
| 115 | "r2 = clrbit(r2, #0)\n\t" /* clear overflow bit */ |
| 116 | "usr = r2\n\t" |
| 117 | "%2 = r2\n\t" |
| 118 | "p3 = sp3loop0(1f, #1)\n\t" |
| 119 | "1:\n\t" |
| 120 | "{\n\t" |
| 121 | " %0 = satb(%2)\n\t" |
| 122 | "}:endloop0\n\t" |
| 123 | "%1 = usr\n\t" |
| 124 | : "=r"(satres), "=r"(usr) |
| 125 | : "r"(0x0410eec0) |
| 126 | : "r2", "usr", "p3", "sa0", "lc0"); |
| 127 | |
| 128 | check32(satres, 0x7f); |
| 129 | check32(get_usr_overflow(usr), true); |
| 130 | check32(get_usr_lpcfg(usr), 2); |
| 131 | } |
| 132 | |
| 133 | int main() |
| 134 | { |
| 135 | struct sigaction act; |
| 136 | bool ovf; |
| 137 | |
| 138 | /* SIGSEGV test */ |
| 139 | act.sa_sigaction = sig_segv; |
| 140 | sigemptyset(&act.sa_mask); |
| 141 | act.sa_flags = SA_SIGINFO; |
| 142 | sigaction(SIGSEGV, &act, NULL); |
| 143 | if (setjmp(jmp_env) == 0) { |
| 144 | satub(300, 0, &ovf); |
| 145 | } |
| 146 | |
| 147 | act.sa_handler = SIG_DFL; |
| 148 | sigemptyset(&act.sa_mask); |
| 149 | act.sa_flags = 0; |
| 150 | |
| 151 | check32(usr_overflow, false); |
| 152 | |
| 153 | test_packet(); |
| 154 | |
| 155 | puts(err ? "FAIL" : "PASS"); |
| 156 | return err ? EXIT_FAILURE : EXIT_SUCCESS; |
| 157 | } |