| /* SPDX-License-Identifier: GPL-2.0 */ |
| #include <as-layout.h> |
| |
| .section .__syscall_stub, "ax" |
| |
| .globl batch_syscall_stub |
| batch_syscall_stub: |
| /* %esp comes in as "top of page" */ |
| mov %esp, %ecx |
| /* %esp has pointer to first operation */ |
| add $8, %esp |
| again: |
| /* load length of additional data */ |
| mov 0x0(%esp), %eax |
| |
| /* if(length == 0) : end of list */ |
| /* write possible 0 to header */ |
| mov %eax, 0x4(%ecx) |
| cmpl $0, %eax |
| jz done |
| |
| /* save current pointer */ |
| mov %esp, 0x4(%ecx) |
| |
| /* skip additional data */ |
| add %eax, %esp |
| |
| /* load syscall-# */ |
| pop %eax |
| |
| /* load syscall params */ |
| pop %ebx |
| pop %ecx |
| pop %edx |
| pop %esi |
| pop %edi |
| pop %ebp |
| |
| /* execute syscall */ |
| int $0x80 |
| |
| /* restore top of page pointer in %ecx */ |
| mov %esp, %ecx |
| andl $(~UM_KERN_PAGE_SIZE) + 1, %ecx |
| |
| /* check return value */ |
| pop %ebx |
| cmp %ebx, %eax |
| je again |
| |
| done: |
| /* save return value */ |
| mov %eax, (%ecx) |
| |
| /* stop */ |
| int3 |
