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// SPDX-License-Identifier: GPL-2.0-only
/*
* Get values of vector registers as soon as the program starts to test if
* is properly cleaning the values before starting a new program. Vector
* registers are caller saved, so no function calls may happen before reading
* the values. To further ensure consistency, this file is compiled without
* libc and without auto-vectorization.
*
* To be "clean" all values must be all zeroes.
*/
#define __stringify_1(x...) #x
#define __stringify(x...) __stringify_1(x)
int main(int argc, char **argv)
{
char value = 0;
unsigned long vl;
if (argc > 2 && strcmp(argv[2], "x"))
asm volatile (
// 0 | zimm[10:0] | rs1 | 1 1 1 | rd |1010111| vsetvli
// vsetvli t4, x0, e8, m1, d1
".4byte 0b00000000000000000111111011010111\n\t"
"mv %[vl], t4\n\t"
: [vl] "=r" (vl) : : "t4"
);
else
asm volatile (
".option push\n\t"
".option arch, +v\n\t"
"vsetvli %[vl], x0, e8, m1, ta, ma\n\t"
".option pop\n\t"
: [vl] "=r" (vl)
);
#define CHECK_VECTOR_REGISTER(register) ({ \
for (int i = 0; i < vl; i++) { \
asm volatile ( \
".option push\n\t" \
".option arch, +v\n\t" \
"vmv.x.s %0, " __stringify(register) "\n\t" \
"vsrl.vi " __stringify(register) ", " __stringify(register) ", 8\n\t" \
".option pop\n\t" \
: "=r" (value)); \
if (value != 0x00) { \
printf("Register " __stringify(register) \
" values not clean! value: %u\n", value); \
exit(-1); \
} \
} \
})
CHECK_VECTOR_REGISTER(v0);
CHECK_VECTOR_REGISTER(v1);
CHECK_VECTOR_REGISTER(v2);
CHECK_VECTOR_REGISTER(v3);
CHECK_VECTOR_REGISTER(v4);
CHECK_VECTOR_REGISTER(v5);
CHECK_VECTOR_REGISTER(v6);
CHECK_VECTOR_REGISTER(v7);
CHECK_VECTOR_REGISTER(v8);
CHECK_VECTOR_REGISTER(v9);
CHECK_VECTOR_REGISTER(v10);
CHECK_VECTOR_REGISTER(v11);
CHECK_VECTOR_REGISTER(v12);
CHECK_VECTOR_REGISTER(v13);
CHECK_VECTOR_REGISTER(v14);
CHECK_VECTOR_REGISTER(v15);
CHECK_VECTOR_REGISTER(v16);
CHECK_VECTOR_REGISTER(v17);
CHECK_VECTOR_REGISTER(v18);
CHECK_VECTOR_REGISTER(v19);
CHECK_VECTOR_REGISTER(v20);
CHECK_VECTOR_REGISTER(v21);
CHECK_VECTOR_REGISTER(v22);
CHECK_VECTOR_REGISTER(v23);
CHECK_VECTOR_REGISTER(v24);
CHECK_VECTOR_REGISTER(v25);
CHECK_VECTOR_REGISTER(v26);
CHECK_VECTOR_REGISTER(v27);
CHECK_VECTOR_REGISTER(v28);
CHECK_VECTOR_REGISTER(v29);
CHECK_VECTOR_REGISTER(v30);
CHECK_VECTOR_REGISTER(v31);
#undef CHECK_VECTOR_REGISTER
return 0;
}
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