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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// REQUIRES: target={{aarch64-.+}}
// UNSUPPORTED: target={{.*-windows.*}}
#include <libunwind.h>
#include <stdlib.h>
#include <string.h>
// Basic test of VG (Vector Granule) unwinding. This is meant to mimic SVE/SME
// unwind info without requiring those features for this test.
#define VG_REGNUM 46
__attribute__((noinline)) void baz() {
// The previous value of VG is 2
asm(".cfi_escape 0x16, 0x2e, 0x01, 0x32");
unw_context_t context;
unw_cursor_t cursor;
unw_getcontext(&context);
unw_init_local(&cursor, &context);
// Note: At this point VG is not defined (until we unw_step).
uint16_t expected_vgs[]{/*qux*/ 2, /*bar*/ 2, /*foo*/ 8, /*main*/ 2};
for (uint16_t expected_vg : expected_vgs) {
unw_step(&cursor);
unw_word_t vg;
unw_get_reg(&cursor, VG_REGNUM, &vg);
if (vg != expected_vg)
exit(1);
}
exit(0);
}
__attribute__((noinline)) void qux() { baz(); }
__attribute__((noinline)) void bar() {
// The previous value of VG is 8
asm(".cfi_escape 0x16, 0x2e, 0x01, 0x38");
// The previous value of W21 is VG (used to force an evaluation of VG).
asm(".cfi_escape 0x16, 0x15, 0x03, 0x92, 0x2e, 0x00");
// smstop sm
qux();
// smstart sm
}
__attribute__((noinline)) void foo() {
// The previous value of VG is 2
asm(".cfi_escape 0x16, 0x2e, 0x01, 0x32");
// The previous value of W21 is VG (used to force an evaluation of VG).
asm(".cfi_escape 0x16, 0x15, 0x03, 0x92, 0x2e, 0x00");
// smstart sm
bar();
// smstop sm
}
int main(int, char **) {
foo();
return 0;
}