1/* 2 * Copyright (c) 2014-2019, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7#include <plat_macros.S> 8#include <platform_def.h> 9 10#include <arch.h> 11#include <asm_macros.S> 12#include <context.h> 13#include <lib/el3_runtime/cpu_data.h> 14#include <lib/utils_def.h> 15 16 .globl report_unhandled_exception 17 .globl report_unhandled_interrupt 18 .globl el3_panic 19 20#if CRASH_REPORTING 21 22 /* ------------------------------------------------------ 23 * The below section deals with dumping the system state 24 * when an unhandled exception is taken in EL3. 25 * The layout and the names of the registers which will 26 * be dumped during a unhandled exception is given below. 27 * ------------------------------------------------------ 28 */ 29.section .rodata.crash_prints, "aS" 30print_spacer: 31 .asciz " = 0x" 32 33gp_regs: 34 .asciz "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",\ 35 "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",\ 36 "x16", "x17", "x18", "x19", "x20", "x21", "x22",\ 37 "x23", "x24", "x25", "x26", "x27", "x28", "x29", "" 38el3_sys_regs: 39 .asciz "scr_el3", "sctlr_el3", "cptr_el3", "tcr_el3",\ 40 "daif", "mair_el3", "spsr_el3", "elr_el3", "ttbr0_el3",\ 41 "esr_el3", "far_el3", "" 42 43non_el3_sys_regs: 44 .asciz "spsr_el1", "elr_el1", "spsr_abt", "spsr_und",\ 45 "spsr_irq", "spsr_fiq", "sctlr_el1", "actlr_el1", "cpacr_el1",\ 46 "csselr_el1", "sp_el1", "esr_el1", "ttbr0_el1", "ttbr1_el1",\ 47 "mair_el1", "amair_el1", "tcr_el1", "tpidr_el1", "tpidr_el0",\ 48 "tpidrro_el0", "par_el1", "mpidr_el1", "afsr0_el1", "afsr1_el1",\ 49 "contextidr_el1", "vbar_el1", "cntp_ctl_el0", "cntp_cval_el0",\ 50 "cntv_ctl_el0", "cntv_cval_el0", "cntkctl_el1", "sp_el0", "isr_el1", "" 51 52#if CTX_INCLUDE_AARCH32_REGS 53aarch32_regs: 54 .asciz "dacr32_el2", "ifsr32_el2", "" 55#endif /* CTX_INCLUDE_AARCH32_REGS */ 56 57panic_msg: 58 .asciz "PANIC in EL3.\nx30" 59excpt_msg: 60 .asciz "Unhandled Exception in EL3.\nx30" 61intr_excpt_msg: 62 .asciz "Unhandled Interrupt Exception in EL3.\nx30" 63 64 /* 65 * Helper function to print from crash buf. 66 * The print loop is controlled by the buf size and 67 * ascii reg name list which is passed in x6. The 68 * function returns the crash buf address in x0. 69 * Clobbers : x0 - x7, sp 70 */ 71func size_controlled_print 72 /* Save the lr */ 73 mov sp, x30 74 /* load the crash buf address */ 75 mrs x7, tpidr_el3 76test_size_list: 77 /* Calculate x5 always as it will be clobbered by asm_print_hex */ 78 mrs x5, tpidr_el3 79 add x5, x5, #CPU_DATA_CRASH_BUF_SIZE 80 /* Test whether we have reached end of crash buf */ 81 cmp x7, x5 82 b.eq exit_size_print 83 ldrb w4, [x6] 84 /* Test whether we are at end of list */ 85 cbz w4, exit_size_print 86 mov x4, x6 87 /* asm_print_str updates x4 to point to next entry in list */ 88 bl asm_print_str 89 /* x0 = number of symbols printed + 1 */ 90 sub x0, x4, x6 91 /* update x6 with the updated list pointer */ 92 mov x6, x4 93 bl print_alignment 94 ldr x4, [x7], #REGSZ 95 bl asm_print_hex 96 bl asm_print_newline 97 b test_size_list 98exit_size_print: 99 mov x30, sp 100 ret 101endfunc size_controlled_print 102 103 /* ----------------------------------------------------- 104 * This function calculates and prints required number 105 * of space characters followed by "= 0x", based on the 106 * length of ascii register name. 107 * x0: length of ascii register name + 1 108 * ------------------------------------------------------ 109 */ 110func print_alignment 111 /* The minimum ascii length is 3, e.g. for "x0" */ 112 adr x4, print_spacer - 3 113 add x4, x4, x0 114 b asm_print_str 115endfunc print_alignment 116 117 /* 118 * Helper function to store x8 - x15 registers to 119 * the crash buf. The system registers values are 120 * copied to x8 to x15 by the caller which are then 121 * copied to the crash buf by this function. 122 * x0 points to the crash buf. It then calls 123 * size_controlled_print to print to console. 124 * Clobbers : x0 - x7, sp 125 */ 126func str_in_crash_buf_print 127 /* restore the crash buf address in x0 */ 128 mrs x0, tpidr_el3 129 stp x8, x9, [x0] 130 stp x10, x11, [x0, #REGSZ * 2] 131 stp x12, x13, [x0, #REGSZ * 4] 132 stp x14, x15, [x0, #REGSZ * 6] 133 b size_controlled_print 134endfunc str_in_crash_buf_print 135 136 /* ------------------------------------------------------ 137 * This macro calculates the offset to crash buf from 138 * cpu_data and stores it in tpidr_el3. It also saves x0 139 * and x1 in the crash buf by using sp as a temporary 140 * register. 141 * ------------------------------------------------------ 142 */ 143 .macro prepare_crash_buf_save_x0_x1 144 /* we can corrupt this reg to free up x0 */ 145 mov sp, x0 146 /* tpidr_el3 contains the address to cpu_data structure */ 147 mrs x0, tpidr_el3 148 /* Calculate the Crash buffer offset in cpu_data */ 149 add x0, x0, #CPU_DATA_CRASH_BUF_OFFSET 150 /* Store crash buffer address in tpidr_el3 */ 151 msr tpidr_el3, x0 152 str x1, [x0, #REGSZ] 153 mov x1, sp 154 str x1, [x0] 155 .endm 156 157 /* ----------------------------------------------------- 158 * This function allows to report a crash (if crash 159 * reporting is enabled) when an unhandled exception 160 * occurs. It prints the CPU state via the crash console 161 * making use of the crash buf. This function will 162 * not return. 163 * ----------------------------------------------------- 164 */ 165func report_unhandled_exception 166 prepare_crash_buf_save_x0_x1 167 adr x0, excpt_msg 168 mov sp, x0 169 /* This call will not return */ 170 b do_crash_reporting 171endfunc report_unhandled_exception 172 173 174 /* ----------------------------------------------------- 175 * This function allows to report a crash (if crash 176 * reporting is enabled) when an unhandled interrupt 177 * occurs. It prints the CPU state via the crash console 178 * making use of the crash buf. This function will 179 * not return. 180 * ----------------------------------------------------- 181 */ 182func report_unhandled_interrupt 183 prepare_crash_buf_save_x0_x1 184 adr x0, intr_excpt_msg 185 mov sp, x0 186 /* This call will not return */ 187 b do_crash_reporting 188endfunc report_unhandled_interrupt 189 190 /* ----------------------------------------------------- 191 * This function allows to report a crash (if crash 192 * reporting is enabled) when panic() is invoked from 193 * C Runtime. It prints the CPU state via the crash 194 * console making use of the crash buf. This function 195 * will not return. 196 * ----------------------------------------------------- 197 */ 198func el3_panic 199 msr spsel, #MODE_SP_ELX 200 prepare_crash_buf_save_x0_x1 201 adr x0, panic_msg 202 mov sp, x0 203 /* This call will not return */ 204 b do_crash_reporting 205endfunc el3_panic 206 207 /* ------------------------------------------------------------ 208 * The common crash reporting functionality. It requires x0 209 * and x1 has already been stored in crash buf, sp points to 210 * crash message and tpidr_el3 contains the crash buf address. 211 * The function does the following: 212 * - Retrieve the crash buffer from tpidr_el3 213 * - Store x2 to x6 in the crash buffer 214 * - Initialise the crash console. 215 * - Print the crash message by using the address in sp. 216 * - Print x30 value to the crash console. 217 * - Print x0 - x7 from the crash buf to the crash console. 218 * - Print x8 - x29 (in groups of 8 registers) using the 219 * crash buf to the crash console. 220 * - Print el3 sys regs (in groups of 8 registers) using the 221 * crash buf to the crash console. 222 * - Print non el3 sys regs (in groups of 8 registers) using 223 * the crash buf to the crash console. 224 * ------------------------------------------------------------ 225 */ 226func do_crash_reporting 227 /* Retrieve the crash buf from tpidr_el3 */ 228 mrs x0, tpidr_el3 229 /* Store x2 - x6, x30 in the crash buffer */ 230 stp x2, x3, [x0, #REGSZ * 2] 231 stp x4, x5, [x0, #REGSZ * 4] 232 stp x6, x30, [x0, #REGSZ * 6] 233 /* Initialize the crash console */ 234 bl plat_crash_console_init 235 /* Verify the console is initialized */ 236 cbz x0, crash_panic 237 /* Print the crash message. sp points to the crash message */ 238 mov x4, sp 239 bl asm_print_str 240 /* Print spaces to align "x30" string */ 241 mov x0, #4 242 bl print_alignment 243 /* load the crash buf address */ 244 mrs x0, tpidr_el3 245 /* report x30 first from the crash buf */ 246 ldr x4, [x0, #REGSZ * 7] 247 bl asm_print_hex 248 bl asm_print_newline 249 /* Load the crash buf address */ 250 mrs x0, tpidr_el3 251 /* Now mov x7 into crash buf */ 252 str x7, [x0, #REGSZ * 7] 253 254 /* Report x0 - x29 values stored in crash buf*/ 255 /* Store the ascii list pointer in x6 */ 256 adr x6, gp_regs 257 /* Print x0 to x7 from the crash buf */ 258 bl size_controlled_print 259 /* Store x8 - x15 in crash buf and print */ 260 bl str_in_crash_buf_print 261 /* Load the crash buf address */ 262 mrs x0, tpidr_el3 263 /* Store the rest of gp regs and print */ 264 stp x16, x17, [x0] 265 stp x18, x19, [x0, #REGSZ * 2] 266 stp x20, x21, [x0, #REGSZ * 4] 267 stp x22, x23, [x0, #REGSZ * 6] 268 bl size_controlled_print 269 /* Load the crash buf address */ 270 mrs x0, tpidr_el3 271 stp x24, x25, [x0] 272 stp x26, x27, [x0, #REGSZ * 2] 273 stp x28, x29, [x0, #REGSZ * 4] 274 bl size_controlled_print 275 276 /* Print the el3 sys registers */ 277 adr x6, el3_sys_regs 278 mrs x8, scr_el3 279 mrs x9, sctlr_el3 280 mrs x10, cptr_el3 281 mrs x11, tcr_el3 282 mrs x12, daif 283 mrs x13, mair_el3 284 mrs x14, spsr_el3 285 mrs x15, elr_el3 286 bl str_in_crash_buf_print 287 mrs x8, ttbr0_el3 288 mrs x9, esr_el3 289 mrs x10, far_el3 290 bl str_in_crash_buf_print 291 292 /* Print the non el3 sys registers */ 293 adr x6, non_el3_sys_regs 294 mrs x8, spsr_el1 295 mrs x9, elr_el1 296 mrs x10, spsr_abt 297 mrs x11, spsr_und 298 mrs x12, spsr_irq 299 mrs x13, spsr_fiq 300 mrs x14, sctlr_el1 301 mrs x15, actlr_el1 302 bl str_in_crash_buf_print 303 mrs x8, cpacr_el1 304 mrs x9, csselr_el1 305 mrs x10, sp_el1 306 mrs x11, esr_el1 307 mrs x12, ttbr0_el1 308 mrs x13, ttbr1_el1 309 mrs x14, mair_el1 310 mrs x15, amair_el1 311 bl str_in_crash_buf_print 312 mrs x8, tcr_el1 313 mrs x9, tpidr_el1 314 mrs x10, tpidr_el0 315 mrs x11, tpidrro_el0 316 mrs x12, par_el1 317 mrs x13, mpidr_el1 318 mrs x14, afsr0_el1 319 mrs x15, afsr1_el1 320 bl str_in_crash_buf_print 321 mrs x8, contextidr_el1 322 mrs x9, vbar_el1 323 mrs x10, cntp_ctl_el0 324 mrs x11, cntp_cval_el0 325 mrs x12, cntv_ctl_el0 326 mrs x13, cntv_cval_el0 327 mrs x14, cntkctl_el1 328 mrs x15, sp_el0 329 bl str_in_crash_buf_print 330 mrs x8, isr_el1 331 bl str_in_crash_buf_print 332 333#if CTX_INCLUDE_AARCH32_REGS 334 /* Print the AArch32 registers */ 335 adr x6, aarch32_regs 336 mrs x8, dacr32_el2 337 mrs x9, ifsr32_el2 338 bl str_in_crash_buf_print 339#endif /* CTX_INCLUDE_AARCH32_REGS */ 340 341 /* Get the cpu specific registers to report */ 342 bl do_cpu_reg_dump 343 bl str_in_crash_buf_print 344 345 /* Print some platform registers */ 346 plat_crash_print_regs 347 348 bl plat_crash_console_flush 349 350 /* Done reporting */ 351 no_ret plat_panic_handler 352endfunc do_crash_reporting 353 354#else /* CRASH_REPORTING */ 355func report_unhandled_exception 356report_unhandled_interrupt: 357 no_ret plat_panic_handler 358endfunc report_unhandled_exception 359#endif /* CRASH_REPORTING */ 360 361 362func crash_panic 363 no_ret plat_panic_handler 364endfunc crash_panic 365