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/*
* Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch.h>
#include <asm_macros.S>
#if ENABLE_ASSERTIONS
.globl asm_assert
/* Since the max decimal input number is 65536 */
#define MAX_DEC_DIVISOR 10000
/* The offset to add to get ascii for numerals '0 - 9' */
#define ASCII_OFFSET_NUM '0'
.section .rodata.assert_str, "aS"
assert_msg1:
.asciz "ASSERT: File "
assert_msg2:
.asciz " Line "
/* ---------------------------------------------------------------------------
* Assertion support in assembly.
* The below function helps to support assertions in assembly where we do not
* have a C runtime stack. Arguments to the function are :
* r0 - File name
* r1 - Line no
* Clobber list : lr, r0 - r6
* ---------------------------------------------------------------------------
*/
func asm_assert
/*
* Only print the output if LOG_LEVEL is higher or equal to
* LOG_LEVEL_INFO, which is the default value for builds with DEBUG=1.
*/
/* Stash the parameters already in r0 and r1 */
mov r5, r0
mov r6, r1
/* Initialize crash console and verify success */
bl plat_crash_console_init
cmp r0, #0
beq 1f
/* Print file name */
ldr r4, =assert_msg1
bl asm_print_str
mov r4, r5
bl asm_print_str
/* Print line number string */
ldr r4, =assert_msg2
bl asm_print_str
/* Test for maximum supported line number */
ldr r4, =~0xffff
tst r6, r4
bne 1f
mov r4, r6
/* Print line number in decimal */
mov r6, #10 /* Divide by 10 after every loop iteration */
ldr r5, =MAX_DEC_DIVISOR
dec_print_loop:
udiv r0, r4, r5 /* Quotient */
mls r4, r0, r5, r4 /* Remainder */
add r0, r0, #ASCII_OFFSET_NUM /* Convert to ASCII */
bl plat_crash_console_putc
udiv r5, r5, r6 /* Reduce divisor */
cmp r5, #0
bne dec_print_loop
bl plat_crash_console_flush
1:
wfi
b 1b
endfunc asm_assert
/*
* This function prints a string from address in r4
* Clobber: lr, r0 - r4
*/
func asm_print_str
mov r3, lr
1:
ldrb r0, [r4], #0x1
cmp r0, #0
beq 2f
bl plat_crash_console_putc
b 1b
2:
bx r3
endfunc asm_print_str
/*
* This function prints a hexadecimal number in r4.
* In: r4 = the hexadecimal to print.
* Clobber: lr, r0 - r3, r5
*/
func asm_print_hex
mov r3, lr
mov r5, #32 /* No of bits to convert to ascii */
1:
sub r5, r5, #4
lsr r0, r4, r5
and r0, r0, #0xf
cmp r0, #0xa
blo 2f
/* Add by 0x27 in addition to ASCII_OFFSET_NUM
* to get ascii for characters 'a - f'.
*/
add r0, r0, #0x27
2:
add r0, r0, #ASCII_OFFSET_NUM
bl plat_crash_console_putc
cmp r5, #0
bne 1b
bx r3
endfunc asm_print_hex
#endif /* ENABLE_ASSERTIONS */
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