| 1 | //===-- Implementation of sigsetjmp ---------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/setjmp/sigsetjmp.h" |
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| 10 | #include "hdr/offsetof_macros.h" |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/macros/config.h" |
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| 13 | #include "src/setjmp/setjmp_impl.h" |
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| 14 | #include "src/setjmp/sigsetjmp_epilogue.h" |
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| 15 | |
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| 16 | #if __riscv_xlen == 64 |
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| 17 | #define STORE(A, B, C) "sd " #A ", %c[" #B "](" #C ")\n\t" |
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| 18 | #define LOAD(A, B, C) "ld " #A ", %c[" #B "](" #C ")\n\t" |
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| 19 | #elif __riscv_xlen == 32 |
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| 20 | #define STORE(A, B, C) "sw " #A ", %c[" #B "](" #C ")\n\t" |
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| 21 | #define LOAD(A, B, C) "lw " #A ", %c[" #B "](" #C ")\n\t" |
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| 22 | #else |
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| 23 | #error "Unsupported RISC-V architecture" |
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| 24 | #endif |
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| 25 | |
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| 26 | namespace LIBC_NAMESPACE_DECL { |
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| 27 | [[gnu::naked]] |
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| 28 | LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf, int)) { |
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| 29 | // clang-format off |
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| 30 | asm("beqz a1, .Lnosave\n\t" |
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| 31 | STORE(ra, retaddr, a0) |
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| 32 | STORE(s0, extra, a0) |
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| 33 | "mv s0, a0\n\t" |
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| 34 | "call %c[setjmp]\n\t" |
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| 35 | "mv a1, a0\n\t" |
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| 36 | "mv a0, s0\n\t" |
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| 37 | LOAD(s0, extra, a0) |
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| 38 | LOAD(ra, retaddr, a0) |
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| 39 | "tail %c[epilogue]\n" |
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| 40 | ".Lnosave:\n\t" |
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| 41 | "tail %c[setjmp]" |
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| 42 | // clang-format on |
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| 43 | ::[retaddr] "i" (offsetof(__jmp_buf, sig_retaddr)), |
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| 44 | [extra] "i" (offsetof(__jmp_buf, sig_extra)), [setjmp] "i" (setjmp), |
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| 45 | [epilogue] "i" (sigsetjmp_epilogue) |
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| 46 | : "a0" , "a1" , "s0" ); |
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| 47 | } |
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| 48 | |
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| 49 | } // namespace LIBC_NAMESPACE_DECL |
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| 50 | |
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