Error Handling - Versionsgeschichte

Satyria am 23. August 2024 um 10:47 Uhr

2024-08-23T10:47:16Z

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	You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/assem/error.zip		You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/assem/error.zip
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Satyria am 22. August 2024 um 07:28 Uhr

2024-08-22T07:28:18Z

← Nächstältere Version		Version vom 22. August 2024, 08:28 Uhr
Zeile 49:		Zeile 49:

	You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/assem/error.zip		You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/assem/error.zip
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Satyria am 19. August 2024 um 19:21 Uhr

2024-08-19T19:21:34Z

← Nächstältere Version		Version vom 19. August 2024, 20:21 Uhr
Zeile 47:		Zeile 47:

	As long as we have no other means to detect an error, we will use this function.		As long as we have no other means to detect an error, we will use this function.

			You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/assem/error.zip

Satyria: Die Seite wurde neu angelegt: „Since we currently have no means to send information to ourselves consciously, we will use the LED to indicate when something goes wrong. To achieve this, we will create a function that can display an error code using the LED. We will extend our '''led.s''' code with this function: .globl LED_Error // In w0 = Error code LED_Error: mov w10, w0 // Save w0 as the function "wait" uses w0 as a timer 1: mov w11,…“

2024-07-23T08:18:09Z

Die Seite wurde neu angelegt: „Since we currently have no means to send information to ourselves consciously, we will use the LED to indicate when something goes wrong. To achieve this, we will create a function that can display an error code using the LED. We will extend our '''led.s''' code with this function: <syntaxhighlight lang="asm"> .globl LED_Error // In w0 = Error code LED_Error: mov w10, w0 // Save w0 as the function "wait" uses w0 as a timer 1: mov w11,…“

Neue Seite

Since we currently have no means to send information to ourselves consciously, we will use the LED to indicate when something goes wrong. To achieve this, we will create a function that can display an error code using the LED.

We will extend our '''led.s''' code with this function:

<syntaxhighlight lang="asm">
.globl LED_Error // In w0 = Error code
LED_Error:
mov w10, w0 // Save w0 as the function "wait" uses w0 as a timer
1:
mov w11, #0 // Set counter to NULL
2:
cmp w11, w10 // Compare the values with the error code
bhs 3f // If greater, exit the inner loop

bl LED_on // Turn the LED on
mov w0, 0x100000 // Wait for 0x100000 cycles
bl wait

bl LED_off // Turn the LED off
mov w0, 0x100000 // Wait again for 0x100000 cycles
bl wait

add w11, w11, 1 // Increment w11 by 1
b 2b // Repeat the loop
3:
mov w0, 0x100000 // Wait an additional 0x100000 cycles to separate the code
bl wait

b 1b // Repeat the code until we shut everything down
</syntaxhighlight>
To test this function, we will modify our kernel.S code:
<syntaxhighlight lang="asm">
//
// kernel.S
//

.section .text
.globl main
main:
bl LED_off

mov w0, #2
bl LED_Error
b main
</syntaxhighlight>
First, we turn off the LED. In register '''w0''', our parameter register, we write the error code '''#2''' and then jump to our '''LED_Error''' function. This function will now make the LED blink twice in quick succession, pause briefly, and repeat the process.

As long as we have no other means to detect an error, we will use this function.