79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
#include "tb_cxxrtl_io.h"
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#include <stdint.h>
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/*EXPECTED-OUTPUT***************************************************************
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Test 1: lr.w -> nop -> sc.w
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OK
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Test 2: lr.w -> sc.w
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OK
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Test 3: sc.w with no preceding lr.w
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OK
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Test 4: lr.w -> sw -> sc.w
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OK
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*******************************************************************************/
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volatile uint32_t scratch[2];
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int main() {
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uint32_t load_result, sc_fail;
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tb_puts("Test 1: lr.w -> nop -> sc.w\n");
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scratch[0] = 0x1234;
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asm volatile (
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"lr.w %0, (%2)\n"
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"nop\n"
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"sc.w %1, %3, (%2)\n"
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// Note the "&": this marks an "earlyclobber" operand, telling GCC it can't
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// allocate this output to an input register. (particularly, %0 to %2)
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: "=&r" (load_result), "=r" (sc_fail)
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: "r" (&scratch[0]), "r" (0x5678)
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);
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tb_assert(load_result == 0x1234, "Bad load result %08x\n", load_result);
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tb_assert(scratch[0] == 0x5678, "Store didn't write memory\n");
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tb_assert(sc_fail == 0, "Should report success\n");
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tb_puts("OK\n");
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tb_puts("Test 2: lr.w -> sc.w\n");
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scratch[0] = 0xabcd;
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asm volatile (
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"lr.w %0, (%2)\n"
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"sc.w %1, %3, (%2)\n"
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: "=&r" (load_result), "=r" (sc_fail)
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: "r" (&scratch[0]), "r" (0xa5a5)
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);
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tb_assert(load_result == 0xabcd, "Bad load result %08x\n", load_result);
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tb_assert(scratch[0] == 0xa5a5, "Store didn't write memory\n");
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tb_assert(sc_fail == 0, "Should report success\n");
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tb_puts("OK\n");
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tb_puts("Test 3: sc.w with no preceding lr.w\n");
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scratch[0] = 0x1234;
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asm volatile (
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"sc.w %0, %2, (%1)\n"
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: "=r" (sc_fail)
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: "r" (&scratch[0]), "r" (0x5678)
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);
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tb_assert(scratch[0] == 0x1234, "Store shouldn't write memory\n");
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tb_assert(sc_fail == 1, "Should report failure\n");
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tb_puts("OK\n");
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// Reservation is only cleared by other harts' stores.
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tb_puts("Test 4: lr.w -> sw -> sc.w\n");
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scratch[0] = 0x1234;
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scratch[1] = 0;
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asm volatile (
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"lr.w %0, (%2)\n"
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"sw %3, 4(%2)\n"
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"sc.w %1, %4, (%2)\n"
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: "=&r" (load_result), "=r" (sc_fail)
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: "r" (&scratch[0]), "r" (0xabcd), "r" (0x5678)
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);
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tb_assert(scratch[1] == 0xabcd, "Regular store should succeed\n");
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tb_assert(scratch[0] == 0x5678, "sc didn't write memory\n");
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tb_assert(sc_fail == 0, "Should report success\n");
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tb_puts("OK\n");
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return 0;
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}
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