From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/x86/um/stub_32.S | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 arch/x86/um/stub_32.S (limited to 'arch/x86/um/stub_32.S') diff --git a/arch/x86/um/stub_32.S b/arch/x86/um/stub_32.S new file mode 100644 index 0000000000..8291899e6a --- /dev/null +++ b/arch/x86/um/stub_32.S @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include + +.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 -- cgit v1.2.3