diff options
Diffstat (limited to 'contrib/llvm-project/compiler-rt/lib/builtins/riscv/restore.S')
| -rw-r--r-- | contrib/llvm-project/compiler-rt/lib/builtins/riscv/restore.S | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/riscv/restore.S b/contrib/llvm-project/compiler-rt/lib/builtins/riscv/restore.S new file mode 100644 index 000000000000..d87dfc1ac71d --- /dev/null +++ b/contrib/llvm-project/compiler-rt/lib/builtins/riscv/restore.S @@ -0,0 +1,208 @@ +//===-- restore.S - restore up to 12 callee-save registers ----------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// Multiple entry points depending on number of registers to restore +// +//===----------------------------------------------------------------------===// + +// All of the entry points are in the same section since we rely on many of +// them falling through into each other and don't want the linker to +// accidentally split them up, garbage collect, or reorder them. +// +// The entry points are grouped up into 2s for rv64 and 4s for rv32 since this +// is the minimum grouping which will maintain the required 16-byte stack +// alignment. + + .text + +#if __riscv_xlen == 32 + +#ifndef __riscv_abi_rve + + .globl __riscv_restore_12 + .type __riscv_restore_12,@function +__riscv_restore_12: + lw s11, 12(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_11/10/9/8 + + .globl __riscv_restore_11 + .type __riscv_restore_11,@function + .globl __riscv_restore_10 + .type __riscv_restore_10,@function + .globl __riscv_restore_9 + .type __riscv_restore_9,@function + .globl __riscv_restore_8 + .type __riscv_restore_8,@function +__riscv_restore_11: +__riscv_restore_10: +__riscv_restore_9: +__riscv_restore_8: + lw s10, 0(sp) + lw s9, 4(sp) + lw s8, 8(sp) + lw s7, 12(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_7/6/5/4 + + .globl __riscv_restore_7 + .type __riscv_restore_7,@function + .globl __riscv_restore_6 + .type __riscv_restore_6,@function + .globl __riscv_restore_5 + .type __riscv_restore_5,@function + .globl __riscv_restore_4 + .type __riscv_restore_4,@function +__riscv_restore_7: +__riscv_restore_6: +__riscv_restore_5: +__riscv_restore_4: + lw s6, 0(sp) + lw s5, 4(sp) + lw s4, 8(sp) + lw s3, 12(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_3/2/1/0 + + .globl __riscv_restore_3 + .type __riscv_restore_3,@function + .globl __riscv_restore_2 + .type __riscv_restore_2,@function + .globl __riscv_restore_1 + .type __riscv_restore_1,@function + .globl __riscv_restore_0 + .type __riscv_restore_0,@function +__riscv_restore_3: +__riscv_restore_2: +__riscv_restore_1: +__riscv_restore_0: + lw s2, 0(sp) + lw s1, 4(sp) + lw s0, 8(sp) + lw ra, 12(sp) + addi sp, sp, 16 + ret + +#else + + .globl __riscv_restore_2 + .type __riscv_restore_2,@function + .globl __riscv_restore_1 + .type __riscv_restore_1,@function + .globl __riscv_restore_0 + .type __riscv_restore_0,@function +__riscv_restore_2: +__riscv_restore_1: +__riscv_restore_0: + lw s1, 0(sp) + lw s0, 4(sp) + lw ra, 8(sp) + addi sp, sp, 12 + ret + +#endif + +#elif __riscv_xlen == 64 + +#ifndef __riscv_abi_rve + + .globl __riscv_restore_12 + .type __riscv_restore_12,@function +__riscv_restore_12: + ld s11, 8(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_11/10 + + .globl __riscv_restore_11 + .type __riscv_restore_11,@function + .globl __riscv_restore_10 + .type __riscv_restore_10,@function +__riscv_restore_11: +__riscv_restore_10: + ld s10, 0(sp) + ld s9, 8(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_9/8 + + .globl __riscv_restore_9 + .type __riscv_restore_9,@function + .globl __riscv_restore_8 + .type __riscv_restore_8,@function +__riscv_restore_9: +__riscv_restore_8: + ld s8, 0(sp) + ld s7, 8(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_7/6 + + .globl __riscv_restore_7 + .type __riscv_restore_7,@function + .globl __riscv_restore_6 + .type __riscv_restore_6,@function +__riscv_restore_7: +__riscv_restore_6: + ld s6, 0(sp) + ld s5, 8(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_5/4 + + .globl __riscv_restore_5 + .type __riscv_restore_5,@function + .globl __riscv_restore_4 + .type __riscv_restore_4,@function +__riscv_restore_5: +__riscv_restore_4: + ld s4, 0(sp) + ld s3, 8(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_3/2 + + .globl __riscv_restore_3 + .type __riscv_restore_3,@function + .globl __riscv_restore_2 + .type __riscv_restore_2,@function +__riscv_restore_3: +__riscv_restore_2: + ld s2, 0(sp) + ld s1, 8(sp) + addi sp, sp, 16 + // fallthrough into __riscv_restore_1/0 + + .globl __riscv_restore_1 + .type __riscv_restore_1,@function + .globl __riscv_restore_0 + .type __riscv_restore_0,@function +__riscv_restore_1: +__riscv_restore_0: + ld s0, 0(sp) + ld ra, 8(sp) + addi sp, sp, 16 + ret + +#else + + .globl __riscv_restore_2 + .type __riscv_restore_2,@function + .globl __riscv_restore_1 + .type __riscv_restore_1,@function + .globl __riscv_restore_0 + .type __riscv_restore_0,@function +__riscv_restore_2: +__riscv_restore_1: +__riscv_restore_0: + ld s1, 0(sp) + ld s0, 8(sp) + ld ra, 16(sp) + addi sp, sp, 24 + ret + +#endif + +#else +# error "xlen must be 32 or 64 for save-restore implementation +#endif |