Merge commit 'v2.6.28-rc2' into x86/pci-ioapic-boot-irq-quirks

1 files changed, 69 insertions, 46 deletions

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 6bc07f0f120..dd65143941a 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -54,6 +54,16 @@
 #include <asm/ftrace.h>
 #include <asm/irq_vectors.h>
 
+/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
+#include <linux/elf-em.h>
+#define AUDIT_ARCH_I386		(EM_386|__AUDIT_ARCH_LE)
+#define __AUDIT_ARCH_LE	   0x40000000
+
+#ifndef CONFIG_AUDITSYSCALL
+#define sysenter_audit	syscall_trace_entry
+#define sysexit_audit	syscall_exit_work
+#endif
+
 /*
  * We use macros for low-level operations which need to be overridden
  * for paravirtualization.  The following will never clobber any registers:
@@ -332,8 +342,9 @@ sysenter_past_esp:
 	GET_THREAD_INFO(%ebp)
 
 	/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
-	testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
-	jnz syscall_trace_entry
+	testw $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
+	jnz sysenter_audit
+sysenter_do_call:
 	cmpl $(nr_syscalls), %eax
 	jae syscall_badsys
 	call *sys_call_table(,%eax,4)
@@ -343,7 +354,8 @@ sysenter_past_esp:
 	TRACE_IRQS_OFF
 	movl TI_flags(%ebp), %ecx
 	testw $_TIF_ALLWORK_MASK, %cx
-	jne syscall_exit_work
+	jne sysexit_audit
+sysenter_exit:
 /* if something modifies registers it must also disable sysexit */
 	movl PT_EIP(%esp), %edx
 	movl PT_OLDESP(%esp), %ecx
@@ -351,6 +363,45 @@ sysenter_past_esp:
 	TRACE_IRQS_ON
 1:	mov  PT_FS(%esp), %fs
 	ENABLE_INTERRUPTS_SYSEXIT
+
+#ifdef CONFIG_AUDITSYSCALL
+sysenter_audit:
+	testw $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
+	jnz syscall_trace_entry
+	addl $4,%esp
+	CFI_ADJUST_CFA_OFFSET -4
+	/* %esi already in 8(%esp)	   6th arg: 4th syscall arg */
+	/* %edx already in 4(%esp)	   5th arg: 3rd syscall arg */
+	/* %ecx already in 0(%esp)	   4th arg: 2nd syscall arg */
+	movl %ebx,%ecx			/* 3rd arg: 1st syscall arg */
+	movl %eax,%edx			/* 2nd arg: syscall number */
+	movl $AUDIT_ARCH_I386,%eax	/* 1st arg: audit arch */
+	call audit_syscall_entry
+	pushl %ebx
+	CFI_ADJUST_CFA_OFFSET 4
+	movl PT_EAX(%esp),%eax		/* reload syscall number */
+	jmp sysenter_do_call
+
+sysexit_audit:
+	testw $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %cx
+	jne syscall_exit_work
+	TRACE_IRQS_ON
+	ENABLE_INTERRUPTS(CLBR_ANY)
+	movl %eax,%edx		/* second arg, syscall return value */
+	cmpl $0,%eax		/* is it < 0? */
+	setl %al		/* 1 if so, 0 if not */
+	movzbl %al,%eax		/* zero-extend that */
+	inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
+	call audit_syscall_exit
+	DISABLE_INTERRUPTS(CLBR_ANY)
+	TRACE_IRQS_OFF
+	movl TI_flags(%ebp), %ecx
+	testw $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %cx
+	jne syscall_exit_work
+	movl PT_EAX(%esp),%eax	/* reload syscall return value */
+	jmp sysenter_exit
+#endif
+
 	CFI_ENDPROC
 .pushsection .fixup,"ax"
 2:	movl $0,PT_FS(%esp)
@@ -370,7 +421,7 @@ ENTRY(system_call)
 	GET_THREAD_INFO(%ebp)
 					# system call tracing in operation / emulation
 	/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
-	testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
+	testw $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
 	jnz syscall_trace_entry
 	cmpl $(nr_syscalls), %eax
 	jae syscall_badsys
@@ -383,10 +434,6 @@ syscall_exit:
 					# setting need_resched or sigpending
 					# between sampling and the iret
 	TRACE_IRQS_OFF
-	testl $X86_EFLAGS_TF,PT_EFLAGS(%esp)	# If tracing set singlestep flag on exit
-	jz no_singlestep
-	orl $_TIF_SINGLESTEP,TI_flags(%ebp)
-no_singlestep:
 	movl TI_flags(%ebp), %ecx
 	testw $_TIF_ALLWORK_MASK, %cx	# current->work
 	jne syscall_exit_work
@@ -514,12 +561,8 @@ END(work_pending)
 syscall_trace_entry:
 	movl $-ENOSYS,PT_EAX(%esp)
 	movl %esp, %eax
-	xorl %edx,%edx
-	call do_syscall_trace
-	cmpl $0, %eax
-	jne resume_userspace		# ret != 0 -> running under PTRACE_SYSEMU,
-					# so must skip actual syscall
-	movl PT_ORIG_EAX(%esp), %eax
+	call syscall_trace_enter
+	/* What it returned is what we'll actually use.  */
 	cmpl $(nr_syscalls), %eax
 	jnae syscall_call
 	jmp syscall_exit
@@ -528,14 +571,13 @@ END(syscall_trace_entry)
 	# perform syscall exit tracing
 	ALIGN
 syscall_exit_work:
-	testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
+	testb $_TIF_WORK_SYSCALL_EXIT, %cl
 	jz work_pending
 	TRACE_IRQS_ON
-	ENABLE_INTERRUPTS(CLBR_ANY)	# could let do_syscall_trace() call
+	ENABLE_INTERRUPTS(CLBR_ANY)	# could let syscall_trace_leave() call
 					# schedule() instead
 	movl %esp, %eax
-	movl $1, %edx
-	call do_syscall_trace
+	call syscall_trace_leave
 	jmp resume_userspace
 END(syscall_exit_work)
 	CFI_ENDPROC
@@ -587,7 +629,7 @@ ENTRY(interrupt)
 ENTRY(irq_entries_start)
 	RING0_INT_FRAME
 vector=0
-.rept NR_IRQS
+.rept NR_VECTORS
 	ALIGN
  .if vector
 	CFI_ADJUST_CFA_OFFSET -4
@@ -688,6 +730,7 @@ error_code:
 	movl $(__USER_DS), %ecx
 	movl %ecx, %ds
 	movl %ecx, %es
+	TRACE_IRQS_OFF
 	movl %esp,%eax			# pt_regs pointer
 	call *%edi
 	jmp ret_from_exception
@@ -718,20 +761,9 @@ ENTRY(device_not_available)
 	RING0_INT_FRAME
 	pushl $-1			# mark this as an int
 	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	GET_CR0_INTO_EAX
-	testl $0x4, %eax		# EM (math emulation bit)
-	jne device_not_available_emulate
-	preempt_stop(CLBR_ANY)
-	call math_state_restore
-	jmp ret_from_exception
-device_not_available_emulate:
-	pushl $0			# temporary storage for ORIG_EIP
+	pushl $do_device_not_available
 	CFI_ADJUST_CFA_OFFSET 4
-	call math_emulate
-	addl $4, %esp
-	CFI_ADJUST_CFA_OFFSET -4
-	jmp ret_from_exception
+	jmp error_code
 	CFI_ENDPROC
 END(device_not_available)
 
@@ -772,6 +804,7 @@ debug_stack_correct:
 	pushl $-1			# mark this as an int
 	CFI_ADJUST_CFA_OFFSET 4
 	SAVE_ALL
+	TRACE_IRQS_OFF
 	xorl %edx,%edx			# error code 0
 	movl %esp,%eax			# pt_regs pointer
 	call do_debug
@@ -816,6 +849,7 @@ nmi_stack_correct:
 	pushl %eax
 	CFI_ADJUST_CFA_OFFSET 4
 	SAVE_ALL
+	TRACE_IRQS_OFF
 	xorl %edx,%edx		# zero error code
 	movl %esp,%eax		# pt_regs pointer
 	call do_nmi
@@ -856,6 +890,7 @@ nmi_espfix_stack:
 	pushl %eax
 	CFI_ADJUST_CFA_OFFSET 4
 	SAVE_ALL
+	TRACE_IRQS_OFF
 	FIXUP_ESPFIX_STACK		# %eax == %esp
 	xorl %edx,%edx			# zero error code
 	call do_nmi
@@ -886,6 +921,7 @@ KPROBE_ENTRY(int3)
 	pushl $-1			# mark this as an int
 	CFI_ADJUST_CFA_OFFSET 4
 	SAVE_ALL
+	TRACE_IRQS_OFF
 	xorl %edx,%edx		# zero error code
 	movl %esp,%eax		# pt_regs pointer
 	call do_int3
@@ -1024,6 +1060,7 @@ ENDPROC(kernel_thread_helper)
 ENTRY(xen_sysenter_target)
 	RING0_INT_FRAME
 	addl $5*4, %esp		/* remove xen-provided frame */
+	CFI_ADJUST_CFA_OFFSET -5*4
 	jmp sysenter_past_esp
 	CFI_ENDPROC
 
@@ -1116,20 +1153,6 @@ ENDPROC(xen_failsafe_callback)
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 ENTRY(mcount)
-	pushl %eax
-	pushl %ecx
-	pushl %edx
-	movl 0xc(%esp), %eax
-	subl $MCOUNT_INSN_SIZE, %eax
-
-.globl mcount_call
-mcount_call:
-	call ftrace_stub
-
-	popl %edx
-	popl %ecx
-	popl %eax
-
 	ret
 END(mcount)