| 1 | #include <assert.h> |
| 2 | #include <signal.h> |
| 3 | #include <stdint.h> |
| 4 | |
| 5 | /* Set asynchronously by the signal handler. */ |
| 6 | static volatile int signum; |
| 7 | |
| 8 | static void signal_handler(int n) |
| 9 | { |
| 10 | signum = n; |
| 11 | } |
| 12 | |
| 13 | static void test_dr(void) |
| 14 | { |
| 15 | register int32_t r0 asm("r0") = -1; |
| 16 | register int32_t r1 asm("r1") = -4241; |
| 17 | int32_t b = 101, q, r; |
| 18 | |
| 19 | asm("dr %[r0],%[b]" |
| 20 | : [r0] "+r" (r0), [r1] "+r" (r1) |
| 21 | : [b] "r" (b) |
| 22 | : "cc"); |
| 23 | q = r1; |
| 24 | r = r0; |
| 25 | assert(q == -41); |
| 26 | assert(r == -100); |
| 27 | } |
| 28 | |
| 29 | static void test_dlr(void) |
| 30 | { |
| 31 | register uint32_t r0 asm("r0") = 0; |
| 32 | register uint32_t r1 asm("r1") = 4243; |
| 33 | uint32_t b = 101, q, r; |
| 34 | |
| 35 | asm("dlr %[r0],%[b]" |
| 36 | : [r0] "+r" (r0), [r1] "+r" (r1) |
| 37 | : [b] "r" (b) |
| 38 | : "cc"); |
| 39 | q = r1; |
| 40 | r = r0; |
| 41 | assert(q == 42); |
| 42 | assert(r == 1); |
| 43 | } |
| 44 | |
| 45 | static void test_dsgr(void) |
| 46 | { |
| 47 | register int64_t r0 asm("r0") = -1; |
| 48 | register int64_t r1 asm("r1") = -4241; |
| 49 | int64_t b = 101, q, r; |
| 50 | |
| 51 | asm("dsgr %[r0],%[b]" |
| 52 | : [r0] "+r" (r0), [r1] "+r" (r1) |
| 53 | : [b] "r" (b) |
| 54 | : "cc"); |
| 55 | q = r1; |
| 56 | r = r0; |
| 57 | assert(q == -41); |
| 58 | assert(r == -100); |
| 59 | } |
| 60 | |
| 61 | static void test_dlgr(void) |
| 62 | { |
| 63 | register uint64_t r0 asm("r0") = 0; |
| 64 | register uint64_t r1 asm("r1") = 4243; |
| 65 | uint64_t b = 101, q, r; |
| 66 | |
| 67 | asm("dlgr %[r0],%[b]" |
| 68 | : [r0] "+r" (r0), [r1] "+r" (r1) |
| 69 | : [b] "r" (b) |
| 70 | : "cc"); |
| 71 | q = r1; |
| 72 | r = r0; |
| 73 | assert(q == 42); |
| 74 | assert(r == 1); |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * The most negative dividend divided by -1 yields a quotient that does not |
| 79 | * fit into 32 bits, so DR must raise a fixed-point-divide exception. |
| 80 | */ |
| 81 | static void test_dr_overflow(void) |
| 82 | { |
| 83 | struct sigaction act = { .sa_handler = signal_handler }; |
| 84 | register int32_t r0 asm("r0"); |
| 85 | register int32_t r1 asm("r1"); |
| 86 | int32_t b = -1; |
| 87 | int err; |
| 88 | |
| 89 | err = sigaction(SIGFPE, &act, NULL); |
| 90 | assert(err == 0); |
| 91 | signum = -1; |
| 92 | |
| 93 | r0 = 0x80000000; |
| 94 | r1 = 0; |
| 95 | asm volatile("dr %[r0],%[b]" |
| 96 | : [r0] "+r" (r0), [r1] "+r" (r1) |
| 97 | : [b] "r" (b) |
| 98 | : "cc"); |
| 99 | assert(signum == SIGFPE); |
| 100 | |
| 101 | signal(SIGFPE, SIG_DFL); |
| 102 | } |
| 103 | |
| 104 | int main(void) |
| 105 | { |
| 106 | test_dr(); |
| 107 | test_dlr(); |
| 108 | test_dsgr(); |
| 109 | test_dlgr(); |
| 110 | test_dr_overflow(); |
| 111 | return 0; |
| 112 | } |