application size limit of 64000000 bytes

[WEREMSOFT]

I found that the limit of how big an application can be is around 64000000 bytes. I reach this conclusion with the following code

// this will work
#define FILLER_SIZE 64000000
// this will not work
//#define FILLER_SIZE 65000000

unsigned char filler[FILLER_SIZE] = {0};
int main()
{
	filler[FILLER_SIZE - 1] = 0xff;
	printf("\n array top value: %d.\n", filler[FILLER_SIZE - 1]);
}

Why is this?

[IanSeyler]

This is due to Pure64 not mapping all of the available system memory to 0xFFFF800000000000. I need to re-work how it parses the BIOS/UEFI memory maps. In the future you should see all of the available memory be mapped correctly.

Keep an eye on the monitor output: [mem: XX MiB]

It's hardcoded to ~64MiB at the moment.

[WEREMSOFT]

I moved the "this is a pointer" up to check if that was creating the issue.

This is the exact code on your last reply

[IanSeyler]

Did you compile with -mno-sse?

[WEREMSOFT]

Never mind, I forgot the flag -mno-sse

[WEREMSOFT]

we are back in business

[IanSeyler]

I’ll look into why SSE instructions cause an exception. gavare.c only uses integer math so no issues there. Pure64 does enable SSE. And if I comment out the SSE enable code then the program causes an UD exception as expected.