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 30 namespace LIBC_NAMESPACE { 31 32 LLVM_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