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x86/entry/32: Switch INT80 to the new C syscall path

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Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/a7e8d8df96838eae3208dd0441023f3ce7a81831.1444091585.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2015-10-05 17:48:14 -07:00 committed by Ingo Molnar
parent 39e8701f33
commit 150ac78d63
1 changed files with 13 additions and 21 deletions
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34
arch/x86/entry/entry_32.S
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@ -153,13 +153,13 @@
#endif /* CONFIG_X86_32_LAZY_GS */ #endif /* CONFIG_X86_32_LAZY_GS */
.macro SAVE_ALL .macro SAVE_ALL pt_regs_ax=%eax
cld cld
PUSH_GS PUSH_GS
pushl %fs pushl %fs
pushl %es pushl %es
pushl %ds pushl %ds
pushl %eax pushl \pt_regs_ax
pushl %ebp pushl %ebp
pushl %edi pushl %edi
pushl %esi pushl %esi
@ -370,20 +370,17 @@ ENDPROC(entry_SYSENTER_32)
# system call handler stub # system call handler stub
ENTRY(entry_INT80_32) ENTRY(entry_INT80_32)
ASM_CLAC ASM_CLAC
pushl %eax # save orig_eax pushl %eax /* pt_regs->orig_ax */
SAVE_ALL SAVE_ALL pt_regs_ax=$-ENOSYS /* save rest, load -ENOSYS into ax */
GET_THREAD_INFO(%ebp)
# system call tracing in operation / emulation /*
testl $_TIF_WORK_SYSCALL_ENTRY, TI_flags(%ebp) * User mode is traced as though IRQs are on, and the interrupt gate
jnz syscall_trace_entry * turned them off.
cmpl $(NR_syscalls), %eax */
jae syscall_badsys TRACE_IRQS_OFF
syscall_call:
call *sys_call_table(, %eax, 4) movl %esp, %eax
syscall_after_call: call do_int80_syscall_32
movl %eax, PT_EAX(%esp) # store the return value
syscall_exit:
jmp syscall_exit_work
restore_all: restore_all:
TRACE_IRQS_IRET TRACE_IRQS_IRET
@ -491,11 +488,6 @@ syscall_fault:
jmp resume_userspace jmp resume_userspace
END(syscall_fault) END(syscall_fault)
syscall_badsys:
movl $-ENOSYS, %eax
jmp syscall_after_call
END(syscall_badsys)
sysenter_badsys: sysenter_badsys:
movl $-ENOSYS, %eax movl $-ENOSYS, %eax
jmp sysenter_after_call jmp sysenter_after_call