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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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: linux && target={{aarch64-.+}}
// Basic test for float registers number are accepted.
#include <stdlib.h>
#include <string.h>
#include <unwind.h>
// Using __attribute__((section("main_func"))) is Linux specific, but then
// this entire test is marked as requiring Linux, so we should be good.
//
// We don't use dladdr() because on musl it's a no-op when statically linked.
extern char __start_main_func;
extern char __stop_main_func;
_Unwind_Reason_Code frame_handler(struct _Unwind_Context *ctx, void *arg) {
(void)arg;
// Unwind until the main is reached, above frames depend on the platform and
// architecture.
uintptr_t ip = _Unwind_GetIP(ctx);
if (ip >= (uintptr_t)&__start_main_func && ip < (uintptr_t)&__stop_main_func) {
_Exit(0);
}
return _URC_NO_REASON;
}
__attribute__((noinline)) void foo() {
// Provide some CFI directives that instructs the unwinder where given
// float register is.
#if defined(__aarch64__)
// DWARF register number for V0-V31 registers are 64-95.
// Previous value of V0 is saved at offset 0 from CFA.
asm volatile(".cfi_offset 64, 0");
// From now on the previous value of register can't be restored anymore.
asm volatile(".cfi_undefined 65");
asm volatile(".cfi_undefined 95");
// Previous value of V2 is in V30.
asm volatile(".cfi_register 66, 94");
#endif
_Unwind_Backtrace(frame_handler, NULL);
}
__attribute__((section("main_func"))) int main() {
foo();
return -2;
}
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