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167 lines
4.4 KiB
ArmAsm
167 lines
4.4 KiB
ArmAsm
//===-- restore.S - restore up to 12 callee-save registers ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Multiple entry points depending on number of registers to restore
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//
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//===----------------------------------------------------------------------===//
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// All of the entry points are in the same section since we rely on many of
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// them falling through into each other and don't want the linker to
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// accidentally split them up, garbage collect, or reorder them.
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//
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// The entry points are grouped up into 2s for rv64 and 4s for rv32 since this
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// is the minimum grouping which will maintain the required 16-byte stack
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// alignment.
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.text
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#if __riscv_xlen == 32
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.globl __riscv_restore_12
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.type __riscv_restore_12,@function
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__riscv_restore_12:
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lw s11, 12(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_11/10/9/8
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.globl __riscv_restore_11
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.type __riscv_restore_11,@function
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.globl __riscv_restore_10
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.type __riscv_restore_10,@function
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.globl __riscv_restore_9
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.type __riscv_restore_9,@function
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.globl __riscv_restore_8
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.type __riscv_restore_8,@function
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__riscv_restore_11:
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__riscv_restore_10:
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__riscv_restore_9:
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__riscv_restore_8:
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lw s10, 0(sp)
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lw s9, 4(sp)
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lw s8, 8(sp)
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lw s7, 12(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_7/6/5/4
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.globl __riscv_restore_7
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.type __riscv_restore_7,@function
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.globl __riscv_restore_6
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.type __riscv_restore_6,@function
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.globl __riscv_restore_5
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.type __riscv_restore_5,@function
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.globl __riscv_restore_4
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.type __riscv_restore_4,@function
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__riscv_restore_7:
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__riscv_restore_6:
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__riscv_restore_5:
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__riscv_restore_4:
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lw s6, 0(sp)
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lw s5, 4(sp)
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lw s4, 8(sp)
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lw s3, 12(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_3/2/1/0
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.globl __riscv_restore_3
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.type __riscv_restore_3,@function
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.globl __riscv_restore_2
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.type __riscv_restore_2,@function
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.globl __riscv_restore_1
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.type __riscv_restore_1,@function
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.globl __riscv_restore_0
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.type __riscv_restore_0,@function
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__riscv_restore_3:
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__riscv_restore_2:
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__riscv_restore_1:
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__riscv_restore_0:
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lw s2, 0(sp)
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lw s1, 4(sp)
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lw s0, 8(sp)
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lw ra, 12(sp)
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addi sp, sp, 16
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ret
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#elif __riscv_xlen == 64
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.globl __riscv_restore_12
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.type __riscv_restore_12,@function
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__riscv_restore_12:
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ld s11, 8(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_11/10
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.globl __riscv_restore_11
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.type __riscv_restore_11,@function
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.globl __riscv_restore_10
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.type __riscv_restore_10,@function
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__riscv_restore_11:
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__riscv_restore_10:
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ld s10, 0(sp)
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ld s9, 8(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_9/8
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.globl __riscv_restore_9
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.type __riscv_restore_9,@function
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.globl __riscv_restore_8
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.type __riscv_restore_8,@function
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__riscv_restore_9:
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__riscv_restore_8:
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ld s8, 0(sp)
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ld s7, 8(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_7/6
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.globl __riscv_restore_7
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.type __riscv_restore_7,@function
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.globl __riscv_restore_6
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.type __riscv_restore_6,@function
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__riscv_restore_7:
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__riscv_restore_6:
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ld s6, 0(sp)
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ld s5, 8(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_5/4
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.globl __riscv_restore_5
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.type __riscv_restore_5,@function
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.globl __riscv_restore_4
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.type __riscv_restore_4,@function
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__riscv_restore_5:
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__riscv_restore_4:
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ld s4, 0(sp)
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ld s3, 8(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_3/2
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.globl __riscv_restore_3
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.type __riscv_restore_3,@function
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.globl __riscv_restore_2
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.type __riscv_restore_2,@function
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__riscv_restore_3:
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__riscv_restore_2:
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ld s2, 0(sp)
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ld s1, 8(sp)
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addi sp, sp, 16
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// fallthrough into __riscv_restore_1/0
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.globl __riscv_restore_1
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.type __riscv_restore_1,@function
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.globl __riscv_restore_0
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.type __riscv_restore_0,@function
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__riscv_restore_1:
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__riscv_restore_0:
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ld s0, 0(sp)
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ld ra, 8(sp)
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addi sp, sp, 16
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ret
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#else
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# error "xlen must be 32 or 64 for save-restore implementation
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#endif
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