Time to define some test data to test if our string macro's actually work as expected.

Unit tests will in the end not be part of the the release code, just for now until we know that the code actually does what we think it should do.

We define some Read-Only data constants.

# rodata.s

.align 2

# Read only data
.section .rodata
VERSION_INFO:                   .string "SparkFun Red-V bare metal v26b.\n\r"
CRLF:                           .string "\n\r"
SEPARATOR_SINGLE_LINE:          .string "------------------------------------------------------------\n\r" 
SEPARATOR_DOUBLE_LINE:          .string "============================================================\n\r" 

.section .rodata.tests
# String testing code
STRINGS_TEST_START_MSG:         .string "Starting strings test.\n\r"
STRINGS_TEST_END_MSG:           .string "Ended strings test.\n\r"
STRINGS_TEST_STRCPY_MSG:        .string "STRCPY test = "
STRINGS_TEST_STRNCPY_MSG:       .string "STRNCPY test = "
STRINGS_TEST_FILL_BYTES_MSG:    .string "FILL_BYTES test = "

STRING_TEST_MSG:                .string "rodata line string test data message.\n\r" 

.byte   0 

In the strings-macros.s I also defined a PRINT macro statement that directly sends to the UART

The idea is to have macro's that makes the assembler code more human friendly, we are basically starting to create some kind of language from scratch.

# ----------------------------------------------------------------------- 
# print message 
# -----------------------------------------------------------------------
.macro PRINT message_ptr
    la    a0, \message_ptr
    jal   puts
.endm

We need a bss.s  that defines a memory block  (1024 bytes) that we can use as scratch buffer (We do not yet have memory management)

# bss.s

.align 2

# Uninitialized data
.section .bss
scratch1024:
    .skip 1024,0

We have now a system that can test the string macros from the previous post.

This becomes part of our logging in the future.

 # strings-tests.s

.align 2

.include "./src/data/data.s"
.include "./src/data/rodata.s"
.include "./src/data/bss.s"  

.include "./src/include/string-macros.s" 

.section .text
.globl _strings_tests

_strings_tests:
    PRINT               STRINGS_TEST_START_MSG
    PRINT               SEPARATOR_DOUBLE_LINE

    PRINT               STRINGS_TEST_STRCPY_MSG
    STRCPY              scratch1024, STRING_TEST_MSG
    PRINT               scratch1024

    PRINT               STRINGS_TEST_STRNCPY_MSG
    STRNCPY             scratch1024, STRING_TEST_MSG, 5
    PRINT               scratch1024
    PRINT               CRLF

    PRINT               STRINGS_TEST_FILL_BYTES_MSG
    FILL_BYTES          scratch1024, '*', 5
    PRINT               scratch1024
    PRINT               CRLF
   
    STRNCPY             scratch1024, destmsg2, 10
    PRINT               scratch1024
    PRINT               CRLF

    FILL_BYTES          scratch1024, '-', 2
    PRINT               scratch1024
    PRINT               CRLF

    STRNCPY             scratch1024, destmsg2, 10
    PRINT               scratch1024
    PRINT               CRLF    

    FILL_STRING         scratch1024, '=', 10
    PRINT               scratch1024    
    PRINT               CRLF

    PRINT               SEPARATOR_SINGLE_LINE
    PRINT               STRINGS_TEST_END_MSG
   
    ret