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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /arch/x86/entry/entry_64.S
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'arch/x86/entry/entry_64.S')
-rw-r--r--arch/x86/entry/entry_64.S28
1 files changed, 20 insertions, 8 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 055a01de7..a55697d19 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -391,20 +391,16 @@ GLOBAL(stub_execveat)
jmp return_from_execve
END(stub_execveat)
-#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
+#if defined(CONFIG_X86_X32_ABI)
.align 8
GLOBAL(stub_x32_execve)
-GLOBAL(stub32_execve)
call compat_sys_execve
jmp return_from_execve
-END(stub32_execve)
END(stub_x32_execve)
.align 8
GLOBAL(stub_x32_execveat)
-GLOBAL(stub32_execveat)
call compat_sys_execveat
jmp return_from_execve
-END(stub32_execveat)
END(stub_x32_execveat)
#endif
@@ -513,6 +509,17 @@ END(irq_entries_start)
* tracking that we're in kernel mode.
*/
SWAPGS
+
+ /*
+ * We need to tell lockdep that IRQs are off. We can't do this until
+ * we fix gsbase, and we should do it before enter_from_user_mode
+ * (which can take locks). Since TRACE_IRQS_OFF idempotent,
+ * the simplest way to handle it is to just call it twice if
+ * we enter from user mode. There's no reason to optimize this since
+ * TRACE_IRQS_OFF is a no-op if lockdep is off.
+ */
+ TRACE_IRQS_OFF
+
#ifdef CONFIG_CONTEXT_TRACKING
call enter_from_user_mode
#endif
@@ -557,7 +564,6 @@ ret_from_intr:
jz retint_kernel
/* Interrupt came from user space */
- LOCKDEP_SYS_EXIT_IRQ
GLOBAL(retint_user)
mov %rsp,%rdi
call prepare_exit_to_usermode
@@ -587,7 +593,7 @@ retint_kernel:
* At this label, code paths which return to kernel and to user,
* which come from interrupts/exception and from syscalls, merge.
*/
-restore_regs_and_iret:
+GLOBAL(restore_regs_and_iret)
RESTORE_EXTRA_REGS
restore_c_regs_and_iret:
RESTORE_C_REGS
@@ -1054,12 +1060,18 @@ ENTRY(error_entry)
SWAPGS
.Lerror_entry_from_usermode_after_swapgs:
+ /*
+ * We need to tell lockdep that IRQs are off. We can't do this until
+ * we fix gsbase, and we should do it before enter_from_user_mode
+ * (which can take locks).
+ */
+ TRACE_IRQS_OFF
#ifdef CONFIG_CONTEXT_TRACKING
call enter_from_user_mode
#endif
+ ret
.Lerror_entry_done:
-
TRACE_IRQS_OFF
ret