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can't read CPSR correctly

arnina over 12 years ago

Note: This was originally posted on 15th October 2009 at http://forums.arm.com

hello,
I write the following codes to determine the mode in which the processor(Xscale) operates:

int x;
    asm volatile ("mrs %0, cpsr"
            :"=r"(x)
        );
    printf("cpsr:%x\n", x);

however, the result is:
cpsr:20000013

it doesn't seem to mean any mode, so what's going on?

Parents

arnina over 12 years ago

Note: This was originally posted on 21st October 2009 at http://forums.arm.com

thks.By the way, I've done another test after that, and I find the difference between CPSR and SPSR:

cpsr:60000013, spsr:600000d3

It means SPSR with IRQ and FIQ disabled.
In which circumstance will it happen?
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arnina over 12 years ago

Note: This was originally posted on 21st October 2009 at http://forums.arm.com

thks.By the way, I've done another test after that, and I find the difference between CPSR and SPSR:

cpsr:60000013, spsr:600000d3

It means SPSR with IRQ and FIQ disabled.
In which circumstance will it happen?
Cancel
Vote up 0 Vote down

Cancel

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can&#39;t read CPSR correctly

can't read CPSR correctly