38 lines
997 B
C
38 lines
997 B
C
#ifndef CALL_APSR_H
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#define CALL_APSR_H
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#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
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#error big endian support not implemented
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#endif
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union cpsr {
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struct {
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uint32_t filler: 28;
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uint32_t v: 1;
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uint32_t c: 1;
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uint32_t z: 1;
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uint32_t n: 1;
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} flags;
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uint32_t value;
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};
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__attribute__((noinline, pcs("aapcs"))) static uint32_t call_apsr_f(float a, float b,
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__attribute__((pcs("aapcs"))) void (*fn)(float, float)) {
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uint32_t result;
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fn(a, b);
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asm volatile("mrs %0, apsr"
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: "=r"(result));
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return result;
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}
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__attribute__((noinline, pcs("aapcs"))) static uint32_t call_apsr_d(double a, double b,
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__attribute__((pcs("aapcs"))) void (*fn)(double, double)) {
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uint32_t result;
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fn(a, b);
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asm volatile("mrs %0, apsr"
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: "=r"(result));
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return result;
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}
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#endif // CALL_APSR_H
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