| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #include <as-layout.h> |
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| 3 | |
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| 4 | .section .__syscall_stub, "ax" |
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| 5 | .globl batch_syscall_stub |
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| 6 | batch_syscall_stub: |
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| 7 | /* %rsp has the pointer to first operation */ |
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| 8 | mov %rsp, %rbx |
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| 9 | add $0x10, %rsp |
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| 10 | again: |
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| 11 | /* load length of additional data */ |
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| 12 | mov 0x0(%rsp), %rax |
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| 13 | |
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| 14 | /* if(length == 0) : end of list */ |
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| 15 | /* write possible 0 to header */ |
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| 16 | mov %rax, 8(%rbx) |
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| 17 | cmp $0, %rax |
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| 18 | jz done |
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| 19 | |
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| 20 | /* save current pointer */ |
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| 21 | mov %rsp, 8(%rbx) |
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| 22 | |
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| 23 | /* skip additional data */ |
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| 24 | add %rax, %rsp |
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| 25 | |
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| 26 | /* load syscall-# */ |
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| 27 | pop %rax |
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| 28 | |
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| 29 | /* load syscall params */ |
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| 30 | pop %rdi |
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| 31 | pop %rsi |
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| 32 | pop %rdx |
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| 33 | pop %r10 |
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| 34 | pop %r8 |
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| 35 | pop %r9 |
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| 36 | |
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| 37 | /* execute syscall */ |
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| 38 | syscall |
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| 39 | |
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| 40 | /* check return value */ |
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| 41 | pop %rcx |
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| 42 | cmp %rcx, %rax |
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| 43 | je again |
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| 44 | |
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| 45 | done: |
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| 46 | /* save return value */ |
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| 47 | mov %rax, (%rbx) |
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| 48 | |
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| 49 | /* stop */ |
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| 50 | int3 |
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| 51 | |
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