| 1 | // -*- C++ -*- |
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| 2 | //===----------------------------------------------------------------------===// |
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| 3 | // |
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| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 5 | // See https://llvm.org/LICENSE.txt for license information. |
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| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 7 | // |
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| 8 | //===----------------------------------------------------------------------===// |
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| 9 | |
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| 10 | // REQUIRES: linux && target={{aarch64-.+}} |
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| 11 | |
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| 12 | // Basic test for float registers number are accepted. |
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| 13 | |
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| 14 | #include <dlfcn.h> |
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| 15 | #include <stdlib.h> |
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| 16 | #include <string.h> |
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| 17 | #include <unwind.h> |
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| 18 | |
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| 19 | _Unwind_Reason_Code frame_handler(struct _Unwind_Context *ctx, void *arg) { |
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| 20 | (void)arg; |
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| 21 | Dl_info info = {.dli_fname: 0, .dli_fbase: 0, .dli_sname: 0, .dli_saddr: 0}; |
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| 22 | |
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| 23 | // Unwind util the main is reached, above frames depend on the platform and |
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| 24 | // architecture. |
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| 25 | if (dladdr(address: reinterpret_cast<void *>(_Unwind_GetIP(ctx)), info: &info) && |
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| 26 | info.dli_sname && !strcmp(s1: "main" , s2: info.dli_sname)) |
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| 27 | _Exit(status: 0); |
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| 28 | |
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| 29 | return _URC_NO_REASON; |
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| 30 | } |
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| 31 | |
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| 32 | __attribute__((noinline)) void foo() { |
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| 33 | // Provide some CFI directives that instructs the unwinder where given |
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| 34 | // float register is. |
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| 35 | #if defined(__aarch64__) |
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| 36 | // DWARF register number for V0-V31 registers are 64-95. |
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| 37 | // Previous value of V0 is saved at offset 0 from CFA. |
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| 38 | asm volatile(".cfi_offset 64, 0" ); |
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| 39 | // From now on the previous value of register can't be restored anymore. |
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| 40 | asm volatile(".cfi_undefined 65" ); |
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| 41 | asm volatile(".cfi_undefined 95" ); |
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| 42 | // Previous value of V2 is in V30. |
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| 43 | asm volatile(".cfi_register 66, 94" ); |
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| 44 | #endif |
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| 45 | _Unwind_Backtrace(frame_handler, NULL); |
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| 46 | } |
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| 47 | |
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| 48 | int main() { |
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| 49 | foo(); |
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| 50 | return -2; |
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| 51 | } |
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| 52 | |
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