367 lines
11 KiB
ArmAsm
367 lines
11 KiB
ArmAsm
/*
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* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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 <cpu_data.h>
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#include <plat_macros.S>
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#include <platform_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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#if CRASH_REPORTING
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#define REG_SIZE 0x8
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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 " =\t\t0x"
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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", "dacr32_el2", "ifsr32_el2", "par_el1",\
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"mpidr_el1", "afsr0_el1", "afsr1_el1", "contextidr_el1",\
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"vbar_el1", "cntp_ctl_el0", "cntp_cval_el0", "cntv_ctl_el0",\
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"cntv_cval_el0", "cntkctl_el1", "fpexc32_el2", "sp_el0", ""
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panic_msg:
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.asciz "PANIC in EL3 at x30 = 0x"
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excpt_msg:
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.asciz "Unhandled Exception in EL3.\nx30 =\t\t0x"
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intr_excpt_msg:
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.asciz "Unhandled Interrupt Exception in EL3.\nx30 =\t\t0x"
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/*
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* Helper function to print newline to console.
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*/
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func print_newline
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mov x0, '\n'
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b plat_crash_console_putc
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endfunc print_newline
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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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/* update x6 with the updated list pointer */
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mov x6, x4
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adr x4, print_spacer
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bl asm_print_str
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ldr x4, [x7], #REG_SIZE
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bl asm_print_hex
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bl 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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* 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, #REG_SIZE * 2]
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stp x12, x13, [x0, #REG_SIZE * 4]
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stp x14, x15, [x0, #REG_SIZE * 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, #REG_SIZE]
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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 (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, #1
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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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/* This call will not return */
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b do_crash_reporting
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endfunc el3_panic
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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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func 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, #REG_SIZE * 2]
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stp x4, x5, [x0, #REG_SIZE * 4]
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stp x6, x30, [x0, #REG_SIZE * 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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/* 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, #REG_SIZE * 7]
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bl asm_print_hex
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bl 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, #REG_SIZE * 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, #REG_SIZE * 2]
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stp x20, x21, [x0, #REG_SIZE * 4]
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stp x22, x23, [x0, #REG_SIZE * 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, #REG_SIZE * 2]
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stp x28, x29, [x0, #REG_SIZE * 4]
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bl size_controlled_print
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/* Print the el3 sys registers */
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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, dacr32_el2
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mrs x13, ifsr32_el2
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mrs x14, par_el1
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mrs x15, mpidr_el1
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bl str_in_crash_buf_print
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mrs x8, afsr0_el1
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mrs x9, afsr1_el1
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mrs x10, contextidr_el1
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mrs x11, vbar_el1
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mrs x12, cntp_ctl_el0
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mrs x13, cntp_cval_el0
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mrs x14, cntv_ctl_el0
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mrs x15, cntv_cval_el0
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bl str_in_crash_buf_print
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mrs x8, cntkctl_el1
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mrs x9, fpexc32_el2
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mrs x10, sp_el0
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bl str_in_crash_buf_print
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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 the gic registers */
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plat_print_gic_regs
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/* Print the interconnect registers */
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plat_print_interconnect_regs
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/* Done reporting */
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b crash_panic
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endfunc do_crash_reporting
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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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b crash_panic
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endfunc report_unhandled_exception
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#endif /* CRASH_REPORING */
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func crash_panic
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b crash_panic
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endfunc crash_panic |