diff options
| author | Benjamin Berg <benjamin@sipsolutions.net> | 2024-07-03 16:45:28 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-07-03 18:09:49 +0300 |
| commit | 76ed9158e1d474e963fc59da7a461b27a2212c5a (patch) | |
| tree | 815dd1fd2568cdcc27d75178249cc809027ca80b /arch/x86/um/stub_64.S | |
| parent | 542dc79f6ea601788704a79ff54283c2bea265e9 (diff) | |
| download | linux-76ed9158e1d474e963fc59da7a461b27a2212c5a.tar.xz | |
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 <benjamin@sipsolutions.net>
Link: https://patch.msgid.link/20240703134536.1161108-5-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/x86/um/stub_64.S')
| -rw-r--r-- | arch/x86/um/stub_64.S | 50 |
1 files changed, 0 insertions, 50 deletions
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 <as-layout.h> - -.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 |