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fix: SIGILL caused by rdcycle prohibited by kernel on RISC-V #10901

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fix: SIGILL caused by rdcycle prohibited by kernel on RISC-V #10901

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19 changes: 10 additions & 9 deletions utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
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Original file line number Diff line number Diff line change
Expand Up @@ -138,22 +138,23 @@ static inline tokutime_t toku_time_now(void) {
asm volatile("stckf %0" : "=Q"(result) : : "cc");
return result;
#elif defined(__riscv) && __riscv_xlen == 32
uint32_t cycles_lo, cycles_hi0, cycles_hi1;
uint32_t times_lo, times_hi0, times_hi1;
// Implemented in assembly because Clang insisted on branching.
// Use rdtime because linux blocks rdcycle due to security reasons.
asm volatile(
"rdcycleh %0\n"
"rdcycle %1\n"
"rdcycleh %2\n"
"rdtimeh %0\n"
"rdtime %1\n"
"rdtimeh %2\n"
"sub %0, %0, %2\n"
"seqz %0, %0\n"
"sub %0, zero, %0\n"
"and %1, %1, %0\n"
: "=r"(cycles_hi0), "=r"(cycles_lo), "=r"(cycles_hi1));
return (static_cast<uint64_t>(cycles_hi1) << 32) | cycles_lo;
: "=r"(times_hi0), "=r"(times_lo), "=r"(times_hi1));
return (static_cast<uint64_t>(times_hi1) << 32) | times_lo;
#elif defined(__riscv) && __riscv_xlen == 64
uint64_t cycles;
asm volatile("rdcycle %0" : "=r"(cycles));
return cycles;
uint64_t times;
asm volatile("rdtime %0" : "=r"(times));
return times;
#else
#error No timer implementation for this platform
#endif
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