CodeWarrior Development ToolsのトピックRe: What does jmp 0,x mean

What does jmp 0,x mean

collapsar — Tue, 24 Apr 2018 06:15:56 GMT

Hi，community

In the source of Bootloader_S12X of "AN4258SW", "JMP 0,x" in the starts12x.s file, why are two parameters, and 0 for what?
The source code is as follows：

Hope for advice

Re: What does jmp 0,x mean

ZhangJennie — Wed, 25 Apr 2018 09:05:24 GMT

Hi,

this code "jmp 0,x",

here 0 is offset.

x stored application reset vector address.

after execution jmp 0,x, code jump to address (x+0) and execute there.

Have a great day,
Jennie Zhang

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Re: What does jmp 0,x mean

collapsar — Wed, 25 Apr 2018 15:42:36 GMT

Hi，Jennie

Thank you for your help, but I have a new problem. I haven't found the detailed document, and I have to trouble you.
It is not said that INIT _BootStart is the same as VECTOR 0 _BootStart, because there is also VECTOR 0 _BootStart in the file（project.prm，Bootloader_S12X，AN4258SW）, so I will comment out the INIT _BootStart, but the Error Link Error: L1115: Function _Startup not found, why?

Have a great day,
Xudai Guo

Re: What does jmp 0,x mean

collapsar — Thu, 26 Apr 2018 00:59:24 GMT

Hi，jennie

About INIT _BootStart，I found out ：

If I comment out the INIT _BootStart and add the start12.c file of the other project to this project, there will be no errors to compile again. What does the INIT keyword do?

Thanks again for your help.

Xudai Guo

Re: What does jmp 0,x mean

ZhangJennie — Thu, 26 Apr 2018 02:25:51 GMT

To separate different subject, please create a new thread for your new question.

Please also add your problem screenshot and demo project that showcase the error.

Thanks for your cooperation.

Jennie Zhang

Re: What does jmp 0,x mean

collapsar — Thu, 26 Apr 2018 03:16:21 GMT

Thanks