From 76ed9158e1d474e963fc59da7a461b27a2212c5a Mon Sep 17 00:00:00 2001 From: Benjamin Berg Date: Wed, 3 Jul 2024 15:45:28 +0200 Subject: um: Rework syscall handling Rework syscall handling to be platform independent. Also create a clean split between queueing of syscalls and flushing them out, removing the need to keep state in the code that triggers the syscalls. The code adds syscall_data_len to the global mm_id structure. This will be used later to allow surrounding code to track whether syscalls still need to run and if errors occurred. Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20240703134536.1161108-5-benjamin@sipsolutions.net Signed-off-by: Johannes Berg --- arch/x86/um/stub_64.S | 50 -------------------------------------------------- 1 file changed, 50 deletions(-) delete mode 100644 arch/x86/um/stub_64.S (limited to 'arch/x86/um/stub_64.S') diff --git a/arch/x86/um/stub_64.S b/arch/x86/um/stub_64.S deleted file mode 100644 index f3404640197a..000000000000 --- a/arch/x86/um/stub_64.S +++ /dev/null @@ -1,50 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#include - -.section .__syscall_stub, "ax" - .globl batch_syscall_stub -batch_syscall_stub: - /* %rsp has the pointer to first operation */ - mov %rsp, %rbx - add $0x10, %rsp -again: - /* load length of additional data */ - mov 0x0(%rsp), %rax - - /* if(length == 0) : end of list */ - /* write possible 0 to header */ - mov %rax, 8(%rbx) - cmp $0, %rax - jz done - - /* save current pointer */ - mov %rsp, 8(%rbx) - - /* skip additional data */ - add %rax, %rsp - - /* load syscall-# */ - pop %rax - - /* load syscall params */ - pop %rdi - pop %rsi - pop %rdx - pop %r10 - pop %r8 - pop %r9 - - /* execute syscall */ - syscall - - /* check return value */ - pop %rcx - cmp %rcx, %rax - je again - -done: - /* save return value */ - mov %rax, (%rbx) - - /* stop */ - int3 -- cgit v1.2.3