48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#include "tb_cxxrtl_io.h"
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#include "hazard3_csr.h"
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/*EXPECTED-OUTPUT***************************************************************
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Load word, 1 byte offset
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-> exception, mcause = 4
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Result: 00000000
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Load word, 2 byte offset
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-> exception, mcause = 4
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Result: 00000000
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Load word, 3 byte offset
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-> exception, mcause = 4
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Result: 00000000
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Load word aligned (sanity check)
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Result: ffffffff
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*******************************************************************************/
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int main() {
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volatile uint32_t target_word = -1u;
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volatile uint32_t result_word = 0;
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tb_puts("Load word, 1 byte offset\n");
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asm volatile("lw %0, 1(%1)" : "+r" (result_word) : "r" (&target_word));
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tb_printf("Result: %08x\n", result_word);
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tb_puts("Load word, 2 byte offset\n");
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asm volatile("lw %0, 2(%1)" : "+r" (result_word) : "r" (&target_word));
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tb_printf("Result: %08x\n", result_word);
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tb_puts("Load word, 3 byte offset\n");
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asm volatile("lw %0, 3(%1)" : "+r" (result_word) : "r" (&target_word));
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tb_printf("Result: %08x\n", result_word);
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tb_puts("Load word aligned (sanity check)\n");
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asm volatile("lw %0, 0(%1)" : "+r" (result_word) : "r" (&target_word));
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tb_printf("Result: %08x\n", result_word);
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}
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void __attribute__((interrupt)) handle_exception() {
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tb_printf("-> exception, mcause = %u\n", read_csr(mcause));
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write_csr(mcause, 0);
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if ((*(uint16_t*)read_csr(mepc) & 0x3) == 0x3) {
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write_csr(mepc, read_csr(mepc) + 4);
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}
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else {
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write_csr(mepc, read_csr(mepc) + 2);
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}
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}
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