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CPSR status back to C variable

Note: This was originally posted on 17th November 2008 at http://forums.arm.com

Im using the TI Code Composer suite with an ARM 7 and Im looking for a way to get the CPSR back into a C variable. I was looking through the documentation that came with the compiler and it didnt have quite what I was looking for. What Im looking for is the state of the interrupt disable bit. I need to use this bit as a condition variable for something like:

if (interrupts enabled){
  do this 
}

the inline asm syntax is just

asm("assembly");

The problem is, Im not sure how to associate some C variable to the asm code to pass the CPSR back to the C code flow. Ive used other compilers in the past that have an option to pass arguments to the asm code like

_asm("tfr b, ccr",foo);

which passes the condition code register (for an HC12) to the var foo, but this compiler does not have that capability. How would I do the above with this compiler?

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0 Peter Harris over 12 years ago

Note: This was originally posted on 17th November 2008 at http://forums.arm.com

I don't know anything about the TI compiler syntax, but the assembler instruction you are looking for is the "MSR" (move to status register from register) and "MRS" (move to register from status register).
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0 Peter Harris over 12 years ago

Note: This was originally posted on 17th November 2008 at http://forums.arm.com

I don't know anything about the TI compiler syntax, but the assembler instruction you are looking for is the "MSR" (move to status register from register) and "MRS" (move to register from status register).
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