call_apsr.h
997 Bytes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
#ifndef CALL_APSR_H
#define CALL_APSR_H
#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
#error big endian support not implemented
#endif
union cpsr {
struct {
uint32_t filler: 28;
uint32_t v: 1;
uint32_t c: 1;
uint32_t z: 1;
uint32_t n: 1;
} flags;
uint32_t value;
};
__attribute__((noinline, pcs("aapcs"))) static uint32_t call_apsr_f(float a, float b,
__attribute__((pcs("aapcs"))) void (*fn)(float, float)) {
uint32_t result;
fn(a, b);
asm volatile("mrs %0, apsr"
: "=r"(result));
return result;
}
__attribute__((noinline, pcs("aapcs"))) static uint32_t call_apsr_d(double a, double b,
__attribute__((pcs("aapcs"))) void (*fn)(double, double)) {
uint32_t result;
fn(a, b);
asm volatile("mrs %0, apsr"
: "=r"(result));
return result;
}
#endif // CALL_APSR_H