64 lines
1.7 KiB
C
64 lines
1.7 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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1: defined illegal all-zeroes
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Exception, mcause = 2
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16-bit illegal instruction: 0000
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2: defined illegal all-ones
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Exception, mcause = 2
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32-bit illegal instruction: ffffffff
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3: unimplemented CSR 0xfff
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Exception, mcause = 2
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32-bit illegal instruction: fff027f3
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4: write to read-only CSR
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Exception, mcause = 2
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32-bit illegal instruction: f1101073
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5: unimplemented instruction (F extension)
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Exception, mcause = 2
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32-bit illegal instruction: 00052087
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*******************************************************************************/
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int main() {
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tb_puts("1: defined illegal all-zeroes\n");
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asm volatile (".hword 0x0000");
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tb_puts("2: defined illegal all-ones\n");
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asm volatile (".word 0xffffffff");
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tb_puts("3: unimplemented CSR 0xfff\n");
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uint32_t junk;
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asm volatile ("csrr %0, 0xfff" : "=r" (junk));
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tb_puts("4: write to read-only CSR\n");
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asm volatile ("csrw mvendorid, zero");
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// However a clear/set with zero value does not count as a write, so this
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// won't appear in the printf output:
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asm volatile ("csrs mvendorid, zero");
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tb_puts("5: unimplemented instruction (F extension)\n");
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asm volatile (".word 0x00052087"); // flw ft1, (a0)
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return 0;
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}
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void __attribute__((interrupt)) handle_exception() {
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uintptr_t mepc = read_csr(mepc);
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uint32_t mcause = read_csr(mcause);
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tb_printf("Exception, mcause = %u\n", mcause);
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uint16_t i0 = *(uint16_t*)mepc;
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if (i0 & 0x3u == 0x3u) {
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uint16_t i1 = *(uint16_t*)(mepc + 2);
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tb_printf("32-bit illegal instruction: %04x%04x\n", i1, i0);
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mepc += 4;
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}
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else {
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tb_printf("16-bit illegal instruction: %04x\n", i0);
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mepc += 2;
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}
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write_csr(mepc, mepc);
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}
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