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//===-- 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
.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
#elif __riscv_xlen == 64
.globl __riscv_restore_12
.type __riscv_restore_12,@function
__riscv_restore_12:
ld s11, 8(sp)
addi sp, sp, 16
// fallthrough into __riscv_restore_11/10/9/8
.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
.globl __riscv_restore_1
.type __riscv_restore_1,@function
.globl __riscv_restore_0
.type __riscv_restore_0,@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
__riscv_restore_1:
__riscv_restore_0:
ld s0, 0(sp)
ld ra, 8(sp)
addi sp, sp, 16
ret
#else
# error "xlen must be 32 or 64 for save-restore implementation
#endif
|
