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- ; Copyright (C) 2019 Intel Corporation. All rights reserved.
- ; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- AREA |.text|, CODE, READONLY, ALIGN=2
- EXPORT invokeNative
- ; ------------------------ direct call path ------------------------
- call_func
- mov x20, x30 ; save x30(lr)
- blr x19
- mov sp, x22 ; restore sp saved before function call
- return_label
- mov x30, x20 ; restore x30(lr)
- ldp x19, x20, [sp, #0x20]
- ldp x21, x22, [sp, #0x10]
- ldp x23, x24, [sp, #0x0]
- add sp, sp, #0x30
- ret
- ; ------------------------ stack-args path ------------------------
- handle_stack
- ; Reserve aligned stack space for stack arguments and copy them
- mov x23, sp
- bic sp, x23, #15 ; Ensure 16-byte alignment
- lsl x23, x21, #3 ; x23 = nstacks * 8
- add x23, x23, #15
- bic x23, x23, #15
- sub sp, sp, x23
- mov x23, sp
- copy_loop
- cmp x21, #0
- b.eq call_func ; when done, branch back to call path
- ldr x24, [x20], #8
- str x24, [x23], #8
- sub x21, x21, #1
- b copy_loop
- ; ------------------------ function entry ------------------------
- invokeNative
- sub sp, sp, #0x30
- stp x19, x20, [sp, #0x20] ; save the registers
- stp x21, x22, [sp, #0x10]
- stp x23, x24, [sp, #0x0]
- mov x19, x0 ; x19 = function ptr
- mov x20, x1 ; x20 = argv
- mov x21, x2 ; x21 = nstacks
- mov x22, sp ; save the sp before call function
- ; Fill in floating-point registers
- ldp d0, d1, [x20], #16
- ldp d2, d3, [x20], #16
- ldp d4, d5, [x20], #16
- ldp d6, d7, [x20], #16
- ; Fill integer registers
- ldp x0, x1, [x20], #16 ; x0 = argv[8] = exec_env, x1 = argv[9]
- ldp x2, x3, [x20], #16
- ldp x4, x5, [x20], #16
- ldp x6, x7, [x20], #16
- ; Now x20 points to stack args
- cmp x21, #0
- b.ne handle_stack ; backward: there are stack args
- b call_func ; backward: no stack args
- END
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