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477 lines
13 KiB
477 lines
13 KiB
/*
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* Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <plat_macros.S>
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#include <platform_def.h>
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#include <arch.h>
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#include <asm_macros.S>
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#include <context.h>
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#include <lib/el3_runtime/cpu_data.h>
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#include <lib/utils_def.h>
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.globl report_unhandled_exception
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.globl report_unhandled_interrupt
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.globl el3_panic
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.globl elx_panic
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#if CRASH_REPORTING
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/* ------------------------------------------------------
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* The below section deals with dumping the system state
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* when an unhandled exception is taken in EL3.
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* The layout and the names of the registers which will
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* be dumped during a unhandled exception is given below.
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* ------------------------------------------------------
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*/
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.section .rodata.crash_prints, "aS"
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print_spacer:
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.asciz " = 0x"
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gp_regs:
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.asciz "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",\
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"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",\
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"x16", "x17", "x18", "x19", "x20", "x21", "x22",\
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"x23", "x24", "x25", "x26", "x27", "x28", "x29", ""
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el3_sys_regs:
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.asciz "scr_el3", "sctlr_el3", "cptr_el3", "tcr_el3",\
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"daif", "mair_el3", "spsr_el3", "elr_el3", "ttbr0_el3",\
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"esr_el3", "far_el3", ""
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non_el3_sys_regs:
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.asciz "spsr_el1", "elr_el1", "spsr_abt", "spsr_und",\
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"spsr_irq", "spsr_fiq", "sctlr_el1", "actlr_el1", "cpacr_el1",\
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"csselr_el1", "sp_el1", "esr_el1", "ttbr0_el1", "ttbr1_el1",\
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"mair_el1", "amair_el1", "tcr_el1", "tpidr_el1", "tpidr_el0",\
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"tpidrro_el0", "par_el1", "mpidr_el1", "afsr0_el1", "afsr1_el1",\
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"contextidr_el1", "vbar_el1", "cntp_ctl_el0", "cntp_cval_el0",\
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"cntv_ctl_el0", "cntv_cval_el0", "cntkctl_el1", "sp_el0", "isr_el1", ""
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#if CTX_INCLUDE_AARCH32_REGS
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aarch32_regs:
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.asciz "dacr32_el2", "ifsr32_el2", ""
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#endif /* CTX_INCLUDE_AARCH32_REGS */
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panic_msg:
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.asciz "PANIC in EL3.\nx30"
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excpt_msg:
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.asciz "Unhandled Exception in EL3.\nx30"
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intr_excpt_msg:
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.ascii "Unhandled Interrupt Exception in EL3.\n"
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x30_msg:
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.asciz "x30"
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excpt_msg_el:
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.asciz "Unhandled Exception from EL"
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/*
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* Helper function to print from crash buf.
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* The print loop is controlled by the buf size and
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* ascii reg name list which is passed in x6. The
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* function returns the crash buf address in x0.
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* Clobbers : x0 - x7, sp
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*/
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func size_controlled_print
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/* Save the lr */
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mov sp, x30
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/* load the crash buf address */
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mrs x7, tpidr_el3
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test_size_list:
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/* Calculate x5 always as it will be clobbered by asm_print_hex */
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mrs x5, tpidr_el3
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add x5, x5, #CPU_DATA_CRASH_BUF_SIZE
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/* Test whether we have reached end of crash buf */
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cmp x7, x5
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b.eq exit_size_print
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ldrb w4, [x6]
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/* Test whether we are at end of list */
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cbz w4, exit_size_print
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mov x4, x6
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/* asm_print_str updates x4 to point to next entry in list */
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bl asm_print_str
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/* x0 = number of symbols printed + 1 */
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sub x0, x4, x6
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/* update x6 with the updated list pointer */
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mov x6, x4
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bl print_alignment
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ldr x4, [x7], #REGSZ
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bl asm_print_hex
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bl asm_print_newline
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b test_size_list
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exit_size_print:
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mov x30, sp
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ret
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endfunc size_controlled_print
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/* -----------------------------------------------------
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* This function calculates and prints required number
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* of space characters followed by "= 0x", based on the
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* length of ascii register name.
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* x0: length of ascii register name + 1
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* ------------------------------------------------------
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*/
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func print_alignment
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/* The minimum ascii length is 3, e.g. for "x0" */
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adr x4, print_spacer - 3
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add x4, x4, x0
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b asm_print_str
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endfunc print_alignment
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/*
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* Helper function to store x8 - x15 registers to
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* the crash buf. The system registers values are
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* copied to x8 to x15 by the caller which are then
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* copied to the crash buf by this function.
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* x0 points to the crash buf. It then calls
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* size_controlled_print to print to console.
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* Clobbers : x0 - x7, sp
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*/
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func str_in_crash_buf_print
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/* restore the crash buf address in x0 */
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mrs x0, tpidr_el3
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stp x8, x9, [x0]
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stp x10, x11, [x0, #REGSZ * 2]
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stp x12, x13, [x0, #REGSZ * 4]
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stp x14, x15, [x0, #REGSZ * 6]
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b size_controlled_print
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endfunc str_in_crash_buf_print
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/* ------------------------------------------------------
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* This macro calculates the offset to crash buf from
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* cpu_data and stores it in tpidr_el3. It also saves x0
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* and x1 in the crash buf by using sp as a temporary
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* register.
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* ------------------------------------------------------
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*/
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.macro prepare_crash_buf_save_x0_x1
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/* we can corrupt this reg to free up x0 */
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mov sp, x0
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/* tpidr_el3 contains the address to cpu_data structure */
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mrs x0, tpidr_el3
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/* Calculate the Crash buffer offset in cpu_data */
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add x0, x0, #CPU_DATA_CRASH_BUF_OFFSET
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/* Store crash buffer address in tpidr_el3 */
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msr tpidr_el3, x0
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str x1, [x0, #REGSZ]
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mov x1, sp
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str x1, [x0]
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.endm
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/* -----------------------------------------------------
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* This function allows to report a crash (if crash
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* reporting is enabled) when an unhandled exception
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* occurs. It prints the CPU state via the crash console
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* making use of the crash buf. This function will
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* not return.
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* -----------------------------------------------------
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*/
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func report_unhandled_exception
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prepare_crash_buf_save_x0_x1
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adr x0, excpt_msg
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mov sp, x0
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/* This call will not return */
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b do_crash_reporting
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endfunc report_unhandled_exception
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/* -----------------------------------------------------
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* This function allows to report a crash (if crash
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* reporting is enabled) when an unhandled interrupt
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* occurs. It prints the CPU state via the crash console
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* making use of the crash buf. This function will
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* not return.
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* -----------------------------------------------------
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*/
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func report_unhandled_interrupt
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prepare_crash_buf_save_x0_x1
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adr x0, intr_excpt_msg
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mov sp, x0
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/* This call will not return */
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b do_crash_reporting
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endfunc report_unhandled_interrupt
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/* -----------------------------------------------------
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* This function allows to report a crash from the lower
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* exception level (if crash reporting is enabled) when
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* panic() is invoked from C Runtime.
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* It prints the CPU state via the crash console making
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* use of 'cpu_context' structure where general purpose
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* registers are saved and the crash buf.
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* This function will not return.
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*
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* x0: Exception level
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* -----------------------------------------------------
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*/
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func elx_panic
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msr spsel, #MODE_SP_ELX
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mov x8, x0
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/* Print the crash message */
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adr x4, excpt_msg_el
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bl asm_print_str
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/* Print exception level */
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add x0, x8, #'0'
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bl plat_crash_console_putc
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bl asm_print_newline
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/* Report x0 - x29 values stored in 'gpregs_ctx' structure */
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/* Store the ascii list pointer in x6 */
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adr x6, gp_regs
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add x7, sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0
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print_next:
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ldrb w4, [x6]
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/* Test whether we are at end of list */
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cbz w4, print_x30
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mov x4, x6
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/* asm_print_str updates x4 to point to next entry in list */
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bl asm_print_str
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/* x0 = number of symbols printed + 1 */
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sub x0, x4, x6
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/* Update x6 with the updated list pointer */
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mov x6, x4
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bl print_alignment
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ldr x4, [x7], #REGSZ
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bl asm_print_hex
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bl asm_print_newline
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b print_next
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print_x30:
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adr x4, x30_msg
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bl asm_print_str
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/* Print spaces to align "x30" string */
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mov x0, #4
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bl print_alignment
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/* Report x30 */
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ldr x4, [x7]
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/* ----------------------------------------------------------------
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* Different virtual address space size can be defined for each EL.
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* Ensure that we use the proper one by reading the corresponding
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* TCR_ELx register.
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* ----------------------------------------------------------------
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*/
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cmp x8, #MODE_EL2
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b.lt from_el1 /* EL1 */
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mrs x2, sctlr_el2
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mrs x1, tcr_el2
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/* ----------------------------------------------------------------
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* Check if pointer authentication is enabled at the specified EL.
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* If it isn't, we can then skip stripping a PAC code.
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* ----------------------------------------------------------------
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*/
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test_pauth:
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tst x2, #(SCTLR_EnIA_BIT | SCTLR_EnIB_BIT)
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b.eq no_pauth
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/* Demangle address */
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and x1, x1, #0x3F /* T0SZ = TCR_ELx[5:0] */
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sub x1, x1, #64
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neg x1, x1 /* bottom_pac_bit = 64 - T0SZ */
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mov x2, #-1
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lsl x2, x2, x1
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bic x4, x4, x2
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no_pauth:
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bl asm_print_hex
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bl asm_print_newline
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/* tpidr_el3 contains the address to cpu_data structure */
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mrs x0, tpidr_el3
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/* Calculate the Crash buffer offset in cpu_data */
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add x0, x0, #CPU_DATA_CRASH_BUF_OFFSET
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/* Store crash buffer address in tpidr_el3 */
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msr tpidr_el3, x0
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/* Print the rest of crash dump */
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b print_el3_sys_regs
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from_el1:
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mrs x2, sctlr_el1
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mrs x1, tcr_el1
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b test_pauth
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endfunc elx_panic
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/* -----------------------------------------------------
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* This function allows to report a crash (if crash
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* reporting is enabled) when panic() is invoked from
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* C Runtime. It prints the CPU state via the crash
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* console making use of the crash buf. This function
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* will not return.
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* -----------------------------------------------------
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*/
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func el3_panic
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msr spsel, #MODE_SP_ELX
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prepare_crash_buf_save_x0_x1
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adr x0, panic_msg
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mov sp, x0
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/* Fall through to 'do_crash_reporting' */
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/* ------------------------------------------------------------
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* The common crash reporting functionality. It requires x0
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* and x1 has already been stored in crash buf, sp points to
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* crash message and tpidr_el3 contains the crash buf address.
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* The function does the following:
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* - Retrieve the crash buffer from tpidr_el3
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* - Store x2 to x6 in the crash buffer
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* - Initialise the crash console.
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* - Print the crash message by using the address in sp.
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* - Print x30 value to the crash console.
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* - Print x0 - x7 from the crash buf to the crash console.
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* - Print x8 - x29 (in groups of 8 registers) using the
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* crash buf to the crash console.
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* - Print el3 sys regs (in groups of 8 registers) using the
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* crash buf to the crash console.
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* - Print non el3 sys regs (in groups of 8 registers) using
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* the crash buf to the crash console.
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* ------------------------------------------------------------
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*/
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do_crash_reporting:
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/* Retrieve the crash buf from tpidr_el3 */
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mrs x0, tpidr_el3
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/* Store x2 - x6, x30 in the crash buffer */
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stp x2, x3, [x0, #REGSZ * 2]
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stp x4, x5, [x0, #REGSZ * 4]
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stp x6, x30, [x0, #REGSZ * 6]
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/* Initialize the crash console */
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bl plat_crash_console_init
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/* Verify the console is initialized */
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cbz x0, crash_panic
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/* Print the crash message. sp points to the crash message */
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mov x4, sp
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bl asm_print_str
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/* Print spaces to align "x30" string */
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mov x0, #4
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bl print_alignment
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/* Load the crash buf address */
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mrs x0, tpidr_el3
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/* Report x30 first from the crash buf */
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ldr x4, [x0, #REGSZ * 7]
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#if ENABLE_PAUTH
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/* Demangle address */
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xpaci x4
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#endif
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bl asm_print_hex
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bl asm_print_newline
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/* Load the crash buf address */
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mrs x0, tpidr_el3
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/* Now mov x7 into crash buf */
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str x7, [x0, #REGSZ * 7]
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/* Report x0 - x29 values stored in crash buf */
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/* Store the ascii list pointer in x6 */
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adr x6, gp_regs
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/* Print x0 to x7 from the crash buf */
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bl size_controlled_print
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/* Store x8 - x15 in crash buf and print */
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bl str_in_crash_buf_print
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/* Load the crash buf address */
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mrs x0, tpidr_el3
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/* Store the rest of gp regs and print */
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stp x16, x17, [x0]
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stp x18, x19, [x0, #REGSZ * 2]
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stp x20, x21, [x0, #REGSZ * 4]
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stp x22, x23, [x0, #REGSZ * 6]
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bl size_controlled_print
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/* Load the crash buf address */
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mrs x0, tpidr_el3
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stp x24, x25, [x0]
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stp x26, x27, [x0, #REGSZ * 2]
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stp x28, x29, [x0, #REGSZ * 4]
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bl size_controlled_print
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/* Print the el3 sys registers */
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print_el3_sys_regs:
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adr x6, el3_sys_regs
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mrs x8, scr_el3
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mrs x9, sctlr_el3
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mrs x10, cptr_el3
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mrs x11, tcr_el3
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mrs x12, daif
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mrs x13, mair_el3
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mrs x14, spsr_el3
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mrs x15, elr_el3
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bl str_in_crash_buf_print
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mrs x8, ttbr0_el3
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mrs x9, esr_el3
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mrs x10, far_el3
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bl str_in_crash_buf_print
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/* Print the non el3 sys registers */
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adr x6, non_el3_sys_regs
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mrs x8, spsr_el1
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mrs x9, elr_el1
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mrs x10, spsr_abt
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mrs x11, spsr_und
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mrs x12, spsr_irq
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mrs x13, spsr_fiq
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mrs x14, sctlr_el1
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mrs x15, actlr_el1
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bl str_in_crash_buf_print
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mrs x8, cpacr_el1
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mrs x9, csselr_el1
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mrs x10, sp_el1
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mrs x11, esr_el1
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mrs x12, ttbr0_el1
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mrs x13, ttbr1_el1
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mrs x14, mair_el1
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mrs x15, amair_el1
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bl str_in_crash_buf_print
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mrs x8, tcr_el1
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mrs x9, tpidr_el1
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mrs x10, tpidr_el0
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mrs x11, tpidrro_el0
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mrs x12, par_el1
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mrs x13, mpidr_el1
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mrs x14, afsr0_el1
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mrs x15, afsr1_el1
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bl str_in_crash_buf_print
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mrs x8, contextidr_el1
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mrs x9, vbar_el1
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mrs x10, cntp_ctl_el0
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mrs x11, cntp_cval_el0
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mrs x12, cntv_ctl_el0
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mrs x13, cntv_cval_el0
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mrs x14, cntkctl_el1
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mrs x15, sp_el0
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bl str_in_crash_buf_print
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mrs x8, isr_el1
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bl str_in_crash_buf_print
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#if CTX_INCLUDE_AARCH32_REGS
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/* Print the AArch32 registers */
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adr x6, aarch32_regs
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mrs x8, dacr32_el2
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mrs x9, ifsr32_el2
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bl str_in_crash_buf_print
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#endif /* CTX_INCLUDE_AARCH32_REGS */
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/* Get the cpu specific registers to report */
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bl do_cpu_reg_dump
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bl str_in_crash_buf_print
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/* Print some platform registers */
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plat_crash_print_regs
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bl plat_crash_console_flush
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/* Done reporting */
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no_ret plat_panic_handler
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endfunc el3_panic
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#else /* CRASH_REPORTING */
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func report_unhandled_exception
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report_unhandled_interrupt:
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no_ret plat_panic_handler
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endfunc report_unhandled_exception
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#endif /* CRASH_REPORTING */
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func crash_panic
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no_ret plat_panic_handler
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endfunc crash_panic
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