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Fix Heartbleed demo legacy lock-up due to 32-bit mcycle read #75

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Merged
AlexJones0 merged 1 commit into from
May 22, 2025
Merged

Fix Heartbleed demo legacy lock-up due to 32-bit mcycle read #75

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14 changes: 13 additions & 1 deletion examples/heartbleed/legacy/heartbleed.h
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,19 @@ void write_to_uart(const char *format, ...)
write_to_uart(__VA_ARGS__); \
}

#define rdcycle64 get_mcycle
uint64_t rdcycle64()
{
uint32_t mcycle_high, mcycle_low;
__asm__ volatile("1: "
"csrr t0, mcycleh\n"
"csrr %0, mcycle\n"
"csrr %1, mcycleh\n"
"bne t0, %1, 1b"
: "=r"(mcycle_low), "=r"(mcycle_high)
:
: "t0");
return ((uint64_t)mcycle_high << 32) | mcycle_low;
}

/**
* @brief Read the current GPIO joystick state.
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