1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <as-layout.h> 3 4 .section .__syscall_stub, "ax" 5 .globl batch_syscall_stub 6 batch_syscall_stub: 7 mov $(STUB_DATA), %rbx 8 /* load pointer to first operation */ 9 mov %rbx, %rsp 10 add $0x10, %rsp 11 again: 12 /* load length of additional data */ 13 mov 0x0(%rsp), %rax 14 15 /* if(length == 0) : end of list */ 16 /* write possible 0 to header */ 17 mov %rax, 8(%rbx) 18 cmp $0, %rax 19 jz done 20 21 /* save current pointer */ 22 mov %rsp, 8(%rbx) 23 24 /* skip additional data */ 25 add %rax, %rsp 26 27 /* load syscall-# */ 28 pop %rax 29 30 /* load syscall params */ 31 pop %rdi 32 pop %rsi 33 pop %rdx 34 pop %r10 35 pop %r8 36 pop %r9 37 38 /* execute syscall */ 39 syscall 40 41 /* check return value */ 42 pop %rcx 43 cmp %rcx, %rax 44 je again 45 46 done: 47 /* save return value */ 48 mov %rax, (%rbx) 49 50 /* stop */ 51 int3 52