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219 lines
5.1 KiB
219 lines
5.1 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 <arch.h>
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#include <asm_macros.S>
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#include <common/debug.h>
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.globl asm_print_str
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.globl asm_print_hex
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.globl asm_print_hex_bits
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.globl asm_print_newline
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.globl asm_assert
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.globl do_panic
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/* Since the max decimal input number is 65536 */
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#define MAX_DEC_DIVISOR 10000
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/* The offset to add to get ascii for numerals '0 - 9' */
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#define ASCII_OFFSET_NUM 0x30
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#if ENABLE_ASSERTIONS
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.section .rodata.assert_str, "aS"
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assert_msg1:
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.asciz "ASSERT: File "
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assert_msg2:
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.asciz " Line "
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/*
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* This macro is intended to be used to print the
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* line number in decimal. Used by asm_assert macro.
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* The max number expected is 65536.
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* In: x4 = the decimal to print.
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* Clobber: x30, x0, x1, x2, x5, x6
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*/
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.macro asm_print_line_dec
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mov x6, #10 /* Divide by 10 after every loop iteration */
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mov x5, #MAX_DEC_DIVISOR
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dec_print_loop:
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udiv x0, x4, x5 /* Get the quotient */
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msub x4, x0, x5, x4 /* Find the remainder */
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add x0, x0, #ASCII_OFFSET_NUM /* Convert to ascii */
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bl plat_crash_console_putc
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udiv x5, x5, x6 /* Reduce divisor */
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cbnz x5, dec_print_loop
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.endm
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/* ---------------------------------------------------------------------------
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* Assertion support in assembly.
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* The below function helps to support assertions in assembly where we do not
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* have a C runtime stack. Arguments to the function are :
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* x0 - File name
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* x1 - Line no
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* Clobber list : x30, x0, x1, x2, x3, x4, x5, x6.
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* ---------------------------------------------------------------------------
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*/
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func asm_assert
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#if LOG_LEVEL >= LOG_LEVEL_INFO
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/*
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* Only print the output if LOG_LEVEL is higher or equal to
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* LOG_LEVEL_INFO, which is the default value for builds with DEBUG=1.
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*/
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mov x5, x0
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mov x6, x1
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/* Ensure the console is initialized */
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bl plat_crash_console_init
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/* Check if the console is initialized */
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cbz x0, _assert_loop
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/* The console is initialized */
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adr x4, assert_msg1
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bl asm_print_str
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mov x4, x5
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bl asm_print_str
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adr x4, assert_msg2
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bl asm_print_str
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/* Check if line number higher than max permitted */
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tst x6, #~0xffff
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b.ne _assert_loop
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mov x4, x6
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asm_print_line_dec
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bl plat_crash_console_flush
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_assert_loop:
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#endif /* LOG_LEVEL >= LOG_LEVEL_INFO */
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no_ret plat_panic_handler
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endfunc asm_assert
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#endif /* ENABLE_ASSERTIONS */
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/*
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* This function prints a string from address in x4.
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* In: x4 = pointer to string.
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* Clobber: x30, x0, x1, x2, x3
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*/
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func asm_print_str
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mov x3, x30
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1:
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ldrb w0, [x4], #0x1
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cbz x0, 2f
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bl plat_crash_console_putc
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b 1b
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2:
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ret x3
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endfunc asm_print_str
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/*
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* This function prints a hexadecimal number in x4.
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* In: x4 = the hexadecimal to print.
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* Clobber: x30, x0 - x3, x5
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*/
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func asm_print_hex
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mov x5, #64 /* No of bits to convert to ascii */
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/* Convert to ascii number of bits in x5 */
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asm_print_hex_bits:
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mov x3, x30
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1:
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sub x5, x5, #4
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lsrv x0, x4, x5
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and x0, x0, #0xf
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cmp x0, #0xA
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b.lo 2f
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/* Add by 0x27 in addition to ASCII_OFFSET_NUM
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* to get ascii for characters 'a - f'.
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*/
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add x0, x0, #0x27
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2:
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add x0, x0, #ASCII_OFFSET_NUM
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bl plat_crash_console_putc
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cbnz x5, 1b
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ret x3
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endfunc asm_print_hex
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/*
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* Helper function to print newline to console
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* Clobber: x0
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*/
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func asm_print_newline
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mov x0, '\n'
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b plat_crash_console_putc
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endfunc asm_print_newline
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/***********************************************************
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* The common implementation of do_panic for all BL stages
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***********************************************************/
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.section .rodata.panic_str, "aS"
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panic_msg: .asciz "PANIC at PC : 0x"
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/* ---------------------------------------------------------------------------
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* do_panic assumes that it is invoked from a C Runtime Environment ie a
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* valid stack exists. This call will not return.
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* Clobber list : if CRASH_REPORTING is not enabled then x30, x0 - x6
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* ---------------------------------------------------------------------------
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*/
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/* This is for the non el3 BL stages to compile through */
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.weak el3_panic
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.weak elx_panic
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func do_panic
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#if CRASH_REPORTING
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str x0, [sp, #-0x10]!
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mrs x0, currentel
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ubfx x0, x0, #MODE_EL_SHIFT, #MODE_EL_WIDTH
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cmp x0, #MODE_EL3
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#if !HANDLE_EA_EL3_FIRST
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ldr x0, [sp], #0x10
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b.eq el3_panic
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#else
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b.ne to_panic_common
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/* Check EL the exception taken from */
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mrs x0, spsr_el3
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ubfx x0, x0, #SPSR_EL_SHIFT, #SPSR_EL_WIDTH
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cmp x0, #MODE_EL3
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b.ne elx_panic
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ldr x0, [sp], #0x10
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b el3_panic
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to_panic_common:
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ldr x0, [sp], #0x10
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#endif /* HANDLE_EA_EL3_FIRST */
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#endif /* CRASH_REPORTING */
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panic_common:
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/*
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* el3_panic will be redefined by the BL31
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* crash reporting mechanism (if enabled)
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*/
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el3_panic:
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mov x6, x30
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bl plat_crash_console_init
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/* Check if the console is initialized */
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cbz x0, _panic_handler
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/* The console is initialized */
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adr x4, panic_msg
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bl asm_print_str
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mov x4, x6
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/* The panic location is lr -4 */
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sub x4, x4, #4
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bl asm_print_hex
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bl plat_crash_console_flush
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_panic_handler:
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/* Pass to plat_panic_handler the address from where el3_panic was
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* called, not the address of the call from el3_panic. */
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mov x30, x6
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b plat_panic_handler
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endfunc do_panic
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