1//===-- Implementation of longjmp -----------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/setjmp/longjmp.h"
10#include "src/__support/common.h"
11#include "src/__support/macros/properties/architectures.h"
12
13#include <setjmp.h>
14
15#if !defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
16#error "Invalid file include"
17#endif
18
19#define LOAD_IMPL(insns, reg, val) \
20 LIBC_INLINE_ASM(#insns " " #reg ", %0\n\t" : : "m"(val) :)
21
22#ifdef LIBC_TARGET_ARCH_IS_RISCV32
23#define LOAD(reg, val) LOAD_IMPL(lw, reg, val)
24#define LOAD_FP(reg, val) LOAD_IMPL(flw, reg, val)
25#else
26#define LOAD(reg, val) LOAD_IMPL(ld, reg, val)
27#define LOAD_FP(reg, val) LOAD_IMPL(fld, reg, val)
28#endif
29
30namespace LIBC_NAMESPACE {
31
32LLVM_LIBC_FUNCTION(void, longjmp, (__jmp_buf * buf, int val)) {
33 LOAD(ra, buf->__pc);
34 LOAD(s0, buf->__regs[0]);
35 LOAD(s1, buf->__regs[1]);
36 LOAD(s2, buf->__regs[2]);
37 LOAD(s3, buf->__regs[3]);
38 LOAD(s4, buf->__regs[4]);
39 LOAD(s5, buf->__regs[5]);
40 LOAD(s6, buf->__regs[6]);
41 LOAD(s7, buf->__regs[7]);
42 LOAD(s8, buf->__regs[8]);
43 LOAD(s9, buf->__regs[9]);
44 LOAD(s10, buf->__regs[10]);
45 LOAD(s11, buf->__regs[11]);
46 LOAD(sp, buf->__sp);
47
48#if __riscv_float_abi_double
49 LOAD_FP(fs0, buf->__fpregs[0]);
50 LOAD_FP(fs1, buf->__fpregs[1]);
51 LOAD_FP(fs2, buf->__fpregs[2]);
52 LOAD_FP(fs3, buf->__fpregs[3]);
53 LOAD_FP(fs4, buf->__fpregs[4]);
54 LOAD_FP(fs5, buf->__fpregs[5]);
55 LOAD_FP(fs6, buf->__fpregs[6]);
56 LOAD_FP(fs7, buf->__fpregs[7]);
57 LOAD_FP(fs8, buf->__fpregs[8]);
58 LOAD_FP(fs9, buf->__fpregs[9]);
59 LOAD_FP(fs10, buf->__fpregs[10]);
60 LOAD_FP(fs11, buf->__fpregs[11]);
61#elif defined(__riscv_float_abi_single)
62#error "longjmp implementation not available for the target architecture."
63#endif
64
65 val = val == 0 ? 1 : val;
66 LIBC_INLINE_ASM("add a0, %0, zero\n\t" : : "r"(val) :);
67}
68
69} // namespace LIBC_NAMESPACE
70

source code of libc/src/setjmp/riscv/longjmp.cpp