Re: Point where target instructions are read

[BALATON Zoltan]

On Wed, 3 Apr 2024, Gautam Bhat wrote:
> On Tue, Apr 2, 2024 at 2:01 AM Richard Henderson
> <richard.henderson@linaro.org> wrote:
>
> > The boot process must cooperate somehow.
> >
> > When using loader, you must link the image such that it loads at the pc reset 
> > address
> > defined by the architecture manual.
> >
> >
> > r~
>
> I changed my loading options to the following now to have better control:
>
> ./qemu-system-msp430 -machine msp430-launchpad -device
> loader,file=simple_test.bin,addr=0xFFFE,cpu-num=0,force
> -raw=on -d in_asm,out_asm

Check the docs on the generic loader: 
https://www.qemu.org/docs/master/system/generic-loader.html
I think when using cpu-num it will also set the PC but I don't know much 
about it. Maybe you could start qemu with -S option then do info registers 
in QEMU monitor to check the status to find out what's happening. If real 
board has firmware maybe you need to use that or emulate it in the board 
code if the boot loader exepects it to be present.

Regards,
BALATON Zoltan

> Here simple_test.bin is the raw binary file converted using objcopy.
> addr=0xFFFE is the vector location where the PC will load with the
> starting address.
>
> Now how do I load the address in that reset vector location and set my
> PC? Is there some example code that I can look at?
>
> -Gautam.