| 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 | |
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| 6 | .globl batch_syscall_stub |
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| 7 | batch_syscall_stub: |
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| 8 | /* %esp comes in as "top of page" */ |
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| 9 | mov %esp, %ecx |
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| 10 | /* %esp has pointer to first operation */ |
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| 11 | add $8, %esp |
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| 12 | again: |
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| 13 | /* load length of additional data */ |
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| 14 | mov 0x0(%esp), %eax |
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| 15 | |
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| 16 | /* if(length == 0) : end of list */ |
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| 17 | /* write possible 0 to header */ |
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| 18 | mov %eax, 0x4(%ecx) |
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| 19 | cmpl $0, %eax |
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| 20 | jz done |
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| 21 | |
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| 22 | /* save current pointer */ |
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| 23 | mov %esp, 0x4(%ecx) |
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| 24 | |
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| 25 | /* skip additional data */ |
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| 26 | add %eax, %esp |
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| 27 | |
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| 28 | /* load syscall-# */ |
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| 29 | pop %eax |
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| 30 | |
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| 31 | /* load syscall params */ |
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| 32 | pop %ebx |
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| 33 | pop %ecx |
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| 34 | pop %edx |
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| 35 | pop %esi |
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| 36 | pop %edi |
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| 37 | pop %ebp |
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| 38 | |
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| 39 | /* execute syscall */ |
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| 40 | int $0x80 |
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| 41 | |
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| 42 | /* restore top of page pointer in %ecx */ |
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| 43 | mov %esp, %ecx |
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| 44 | andl $(~UM_KERN_PAGE_SIZE) + 1, %ecx |
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| 45 | |
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| 46 | /* check return value */ |
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| 47 | pop %ebx |
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| 48 | cmp %ebx, %eax |
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| 49 | je again |
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| 50 | |
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| 51 | done: |
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| 52 | /* save return value */ |
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| 53 | mov %eax, (%ecx) |
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| 54 | |
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| 55 | /* stop */ |
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| 56 | int3 |
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| 57 | |
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