RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Return value
The __current_sp intrinsic returns the current value of the stack pointer at the point in
the program where the intrinsic is used.
See also
• __builtin_frame_address on page 4-66
• __current_pc on page 4-70
• __return_address on page 4-83
• Legacy inline assembler that accesses sp, lr, or pc on page 6-27 in the Compiler
User Guide.
4.7.13 __disable_fiq
This intrinsic disables FIQ interrupts.
Syntax
int __disable_fiq(void)
Note
On ARMv7 and ARMv7-M, the __disable_fiq intrinsic has prototype:
void __disable_fiq(void)
Return value
__fiq returns the value the FIQ interrupt mask has in the PSR prior to the disabling of
FIQ interrupts.
Restrictions
The __disable_fiq intrinsic can only be executed in privileged modes, that is, in non
user modes. In User mode this intrinsic does not change the interrupt flags in the CPSR.
Example
void foo(void)
{
int was_masked = __disable_fiq();
/* ... */
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