1 /* This file is part of GDB, the GNU debugger. 2 3 Copyright 2018-2020 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include <signal.h> 19 #include <unistd.h> 20 #include <stdlib.h> 21 22 #define OVERWRITE_GP_REGS \ 23 "ldr x1, [x0]\n\t" \ 24 "ldr x2, [x0]\n\t" \ 25 "ldr x3, [x0]\n\t" \ 26 "ldr x4, [x0]\n\t" \ 27 "ldr x5, [x0]\n\t" \ 28 "ldr x6, [x0]\n\t" \ 29 "ldr x7, [x0]\n\t" \ 30 "ldr x8, [x0]\n\t" \ 31 "ldr x9, [x0]\n\t" \ 32 "ldr x10, [x0]\n\t" \ 33 "ldr x11, [x0]\n\t" \ 34 "ldr x12, [x0]\n\t" \ 35 "ldr x13, [x0]\n\t" \ 36 "ldr x14, [x0]\n\t" \ 37 "ldr x15, [x0]\n\t" \ 38 "ldr x16, [x0]\n\t" \ 39 "ldr x17, [x0]\n\t" \ 40 "ldr x18, [x0]\n\t" \ 41 "ldr x19, [x0]\n\t" \ 42 "ldr x20, [x0]\n\t" \ 43 "ldr x21, [x0]\n\t" \ 44 "ldr x22, [x0]\n\t" \ 45 "ldr x23, [x0]\n\t" \ 46 "ldr x24, [x0]\n\t" \ 47 "ldr x25, [x0]\n\t" \ 48 "ldr x26, [x0]\n\t" \ 49 "ldr x27, [x0]\n\t" \ 50 "ldr x28, [x0]\n\t" 51 52 #ifdef SVE 53 #define OVERWRITE_FP_REGS \ 54 "ptrue p3.s\n\t" \ 55 "ld1w z0.s, p3/z, [x0]\n\t" \ 56 "ld1w z1.s, p3/z, [x0]\n\t" \ 57 "ld1w z2.s, p3/z, [x0]\n\t" \ 58 "ld1w z3.s, p3/z, [x0]\n\t" \ 59 "ld1w z4.s, p3/z, [x0]\n\t" \ 60 "ld1w z5.s, p3/z, [x0]\n\t" \ 61 "ld1w z6.s, p3/z, [x0]\n\t" \ 62 "ld1w z7.s, p3/z, [x0]\n\t" \ 63 "ld1w z8.s, p3/z, [x0]\n\t" \ 64 "ld1w z9.s, p3/z, [x0]\n\t" \ 65 "ld1w z10.s, p3/z, [x0]\n\t" \ 66 "ld1w z11.s, p3/z, [x0]\n\t" \ 67 "ld1w z12.s, p3/z, [x0]\n\t" \ 68 "ld1w z13.s, p3/z, [x0]\n\t" \ 69 "ld1w z14.s, p3/z, [x0]\n\t" \ 70 "ld1w z15.s, p3/z, [x0]\n\t" \ 71 "ld1w z16.s, p3/z, [x0]\n\t" \ 72 "ld1w z17.s, p3/z, [x0]\n\t" \ 73 "ld1w z18.s, p3/z, [x0]\n\t" \ 74 "ld1w z19.s, p3/z, [x0]\n\t" \ 75 "ld1w z20.s, p3/z, [x0]\n\t" \ 76 "ld1w z21.s, p3/z, [x0]\n\t" \ 77 "ld1w z22.s, p3/z, [x0]\n\t" \ 78 "ld1w z23.s, p3/z, [x0]\n\t" \ 79 "ld1w z24.s, p3/z, [x0]\n\t" \ 80 "ld1w z25.s, p3/z, [x0]\n\t" \ 81 "ld1w z26.s, p3/z, [x0]\n\t" \ 82 "ld1w z27.s, p3/z, [x0]\n\t" \ 83 "ld1w z28.s, p3/z, [x0]\n\t" \ 84 "ld1w z29.s, p3/z, [x0]\n\t" \ 85 "ld1w z30.s, p3/z, [x0]\n\t" \ 86 "ld1w z31.s, p3/z, [x0]\n\t" 87 #else 88 #define OVERWRITE_FP_REGS \ 89 "ldr q0, [x0]\n\t" \ 90 "ldr q1, [x0]\n\t" \ 91 "ldr q2, [x0]\n\t" \ 92 "ldr q3, [x0]\n\t" \ 93 "ldr q4, [x0]\n\t" \ 94 "ldr q5, [x0]\n\t" \ 95 "ldr q6, [x0]\n\t" \ 96 "ldr q7, [x0]\n\t" \ 97 "ldr q8, [x0]\n\t" \ 98 "ldr q9, [x0]\n\t" \ 99 "ldr q10, [x0]\n\t" \ 100 "ldr q11, [x0]\n\t" \ 101 "ldr q12, [x0]\n\t" \ 102 "ldr q13, [x0]\n\t" \ 103 "ldr q14, [x0]\n\t" \ 104 "ldr q15, [x0]\n\t" \ 105 "ldr q16, [x0]\n\t" \ 106 "ldr q17, [x0]\n\t" \ 107 "ldr q18, [x0]\n\t" \ 108 "ldr q19, [x0]\n\t" \ 109 "ldr q20, [x0]\n\t" \ 110 "ldr q21, [x0]\n\t" \ 111 "ldr q22, [x0]\n\t" \ 112 "ldr q23, [x0]\n\t" \ 113 "ldr q24, [x0]\n\t" \ 114 "ldr q25, [x0]\n\t" \ 115 "ldr q26, [x0]\n\t" \ 116 "ldr q27, [x0]\n\t" \ 117 "ldr q28, [x0]\n\t" \ 118 "ldr q29, [x0]\n\t" \ 119 "ldr q30, [x0]\n\t" \ 120 "ldr q31, [x0]\n\t" 121 #endif 122 123 #ifdef SVE 124 #define OVERWRITE_P_REGS(pattern) \ 125 "ptrue p0.s, " #pattern "\n\t" \ 126 "ptrue p1.s, " #pattern "\n\t" \ 127 "ptrue p2.s, " #pattern "\n\t" \ 128 "ptrue p3.s, " #pattern "\n\t" \ 129 "ptrue p4.s, " #pattern "\n\t" \ 130 "ptrue p5.s, " #pattern "\n\t" \ 131 "ptrue p6.s, " #pattern "\n\t" \ 132 "ptrue p7.s, " #pattern "\n\t" \ 133 "ptrue p8.s, " #pattern "\n\t" \ 134 "ptrue p9.s, " #pattern "\n\t" \ 135 "ptrue p10.s, " #pattern "\n\t" \ 136 "ptrue p11.s, " #pattern "\n\t" \ 137 "ptrue p12.s, " #pattern "\n\t" \ 138 "ptrue p13.s, " #pattern "\n\t" \ 139 "ptrue p14.s, " #pattern "\n\t" \ 140 "ptrue p15.s, " #pattern "\n\t" 141 #else 142 #define OVERWRITE_P_REGS(pattern) 143 #endif 144 145 146 void 147 handler (int sig) 148 { 149 char buf_handler[] = {0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 150 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f}; 151 152 __asm __volatile ("mov x0, %0\n\t" \ 153 OVERWRITE_GP_REGS \ 154 OVERWRITE_FP_REGS \ 155 OVERWRITE_P_REGS(MUL3) \ 156 : : "r" (buf_handler)); 157 158 exit(0); 159 } 160 161 162 163 int 164 main () 165 { 166 /* Ensure all the signals aren't blocked. */ 167 sigset_t newset; 168 sigemptyset (&newset); 169 sigprocmask (SIG_SETMASK, &newset, NULL); 170 171 signal (SIGILL, handler); 172 173 char buf_main[] = {0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 174 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f}; 175 176 /* 0x06000000 : Cause an illegal instruction. Value undefined as per ARM 177 Architecture Reference Manual ARMv8, Section C4.1. */ 178 179 __asm __volatile ("mov x0, %0\n\t" \ 180 OVERWRITE_GP_REGS \ 181 OVERWRITE_FP_REGS \ 182 OVERWRITE_P_REGS(VL1) \ 183 ".inst 0x06000000" 184 : : "r" (buf_main)); 185 186 return 0; 187 } 188