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__attribute__((cmse_nonsecure_entry)) function attribute
Declares an entry function that can be called from Non-secure state or Secure state.
Syntax
- linkage:
void __attribute__((cmse_nonsecure_entry)) entry_func(int val)- C++ linkage:
extern "C" void __attribute__((cmse_nonsecure_entry)) entry_func(int val)
Note
Compile Secure code with the maximum capabilities for the target. For example, if you compile with no FPU then the Secure functions do not clear floating-point registers when returning from functions declared as__attribute__((cmse_nonsecure_entry)). Therefore,
the functions could potentially leak sensitive data.Example
#include <arm_cmse.h>
void __attribute__((cmse_nonsecure_entry)) entry_func(int val) {
int state = cmse_nonsecure_caller();
if (state)
{ // called from non-secure
// do non-secure work
...
} else
{ // called from within secure
// do secure work
...
}
}