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

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