提交 29ea1b25 编写于 作者: A Andy Lutomirski 提交者: Ingo Molnar

x86/entry/64: Migrate 64-bit and compat syscalls to the new exit handlers and...

x86/entry/64: Migrate 64-bit and compat syscalls to the new exit handlers and remove old assembly code

These need to be migrated together, as the compat case used to
jump into the middle of the 64-bit exit code.

Remove the old assembly code.
Signed-off-by: NAndy 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: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/d4d1d70de08ac3640badf50048a9e8f18fe2497f.1435952415.git.luto@kernel.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
上级 cb6f64ed
......@@ -229,6 +229,11 @@ entry_SYSCALL_64_fastpath:
*/
USERGS_SYSRET64
GLOBAL(int_ret_from_sys_call_irqs_off)
TRACE_IRQS_ON
ENABLE_INTERRUPTS(CLBR_NONE)
jmp int_ret_from_sys_call
/* Do syscall entry tracing */
tracesys:
movq %rsp, %rdi
......@@ -272,69 +277,11 @@ tracesys_phase2:
* Has correct iret frame.
*/
GLOBAL(int_ret_from_sys_call)
DISABLE_INTERRUPTS(CLBR_NONE)
int_ret_from_sys_call_irqs_off: /* jumps come here from the irqs-off SYSRET path */
TRACE_IRQS_OFF
movl $_TIF_ALLWORK_MASK, %edi
/* edi: mask to check */
GLOBAL(int_with_check)
LOCKDEP_SYS_EXIT_IRQ
GET_THREAD_INFO(%rcx)
movl TI_flags(%rcx), %edx
andl %edi, %edx
jnz int_careful
andl $~TS_COMPAT, TI_status(%rcx)
jmp syscall_return
/*
* Either reschedule or signal or syscall exit tracking needed.
* First do a reschedule test.
* edx: work, edi: workmask
*/
int_careful:
bt $TIF_NEED_RESCHED, %edx
jnc int_very_careful
TRACE_IRQS_ON
ENABLE_INTERRUPTS(CLBR_NONE)
pushq %rdi
SCHEDULE_USER
popq %rdi
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
jmp int_with_check
/* handle signals and tracing -- both require a full pt_regs */
int_very_careful:
TRACE_IRQS_ON
ENABLE_INTERRUPTS(CLBR_NONE)
SAVE_EXTRA_REGS
/* Check for syscall exit trace */
testl $_TIF_WORK_SYSCALL_EXIT, %edx
jz int_signal
pushq %rdi
leaq 8(%rsp), %rdi /* &ptregs -> arg1 */
call syscall_trace_leave
popq %rdi
andl $~(_TIF_WORK_SYSCALL_EXIT|_TIF_SYSCALL_EMU), %edi
jmp int_restore_rest
int_signal:
testl $_TIF_DO_NOTIFY_MASK, %edx
jz 1f
movq %rsp, %rdi /* &ptregs -> arg1 */
xorl %esi, %esi /* oldset -> arg2 */
call do_notify_resume
1: movl $_TIF_WORK_MASK, %edi
int_restore_rest:
movq %rsp, %rdi
call syscall_return_slowpath /* returns with IRQs disabled */
RESTORE_EXTRA_REGS
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
jmp int_with_check
syscall_return:
/* The IRETQ could re-enable interrupts: */
DISABLE_INTERRUPTS(CLBR_ANY)
TRACE_IRQS_IRETQ
TRACE_IRQS_IRETQ /* we're about to change IF */
/*
* Try to use SYSRET instead of IRET if we're returning to
......
......@@ -210,10 +210,10 @@ sysexit_from_sys_call:
.endm
.macro auditsys_exit exit
testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
jnz ia32_ret_from_sys_call
TRACE_IRQS_ON
ENABLE_INTERRUPTS(CLBR_NONE)
testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
jnz ia32_ret_from_sys_call
movl %eax, %esi /* second arg, syscall return value */
cmpl $-MAX_ERRNO, %eax /* is it an error ? */
jbe 1f
......@@ -232,7 +232,7 @@ sysexit_from_sys_call:
movq %rax, R10(%rsp)
movq %rax, R9(%rsp)
movq %rax, R8(%rsp)
jmp int_with_check
jmp int_ret_from_sys_call_irqs_off
.endm
sysenter_auditsys:
......
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