linux-kernel - [PATCH] x86: KPROBE_ENTRY should be paired wth KPROBE

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Date:	Sun, 23 Nov 2008 10:15:32 +0100
From:	Alexander van Heukelum <heukelum@...lshack.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Glauber Costa <gcosta@...hat.com>,
	Matt Mackall <mpm@...enic.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: [PATCH] x86: KPROBE_ENTRY should be paired wth KPROBE_END

Impact: moves some code out of .kprobes.text

KPROBE_ENTRY switches code generation to .kprobes.text, and KPROBE_END
uses .popsection to get back to the previous section (.text, normally).
Also replace ENDPROC by END, for consistency.

Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm>

---
 arch/x86/kernel/entry_64.S |   16 +++++++---------
 1 files changed, 7 insertions(+), 9 deletions(-)

Hi Ingo,

One more small change for today. The xen-related functions 
xen_do_hypervisor_callback and xen_failsafe_callback are put
in the .kprobes.text even in the current kernel: ignore_sysret
is enclosed in KPROBE_ENTRY / ENDPROC, instead of KPROBE_ENTRY /
KPROBE_END, but I guess the situation is harmless.

Greetings,
	Alexander

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index ec0ed9c..477a428 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1190,7 +1190,7 @@ paranoid_schedule:
 	TRACE_IRQS_OFF
 	jmp paranoid_userspace
 	CFI_ENDPROC
-END(paranoid_exit)
+KPROBE_END(paranoid_exit)
 
 /*
  * Exception entry point. This expects an error code/orig_rax on the stack.
@@ -1282,7 +1282,7 @@ gs_change:
 	CFI_ADJUST_CFA_OFFSET -8
         ret
 	CFI_ENDPROC
-ENDPROC(native_load_gs_index)
+END(native_load_gs_index)
 
         .section __ex_table,"a"
         .align 8
@@ -1336,7 +1336,7 @@ ENTRY(kernel_thread)
 	UNFAKE_STACK_FRAME
 	ret
 	CFI_ENDPROC
-ENDPROC(kernel_thread)
+END(kernel_thread)
 
 child_rip:
 	pushq $0		# fake return address
@@ -1352,7 +1352,7 @@ child_rip:
 	mov %eax, %edi
 	call do_exit
 	CFI_ENDPROC
-ENDPROC(child_rip)
+END(child_rip)
 
 /*
  * execve(). This function needs to use IRET, not SYSRET, to set up all state properly.
@@ -1383,9 +1383,7 @@ ENTRY(kernel_execve)
 	UNFAKE_STACK_FRAME
 	ret
 	CFI_ENDPROC
-ENDPROC(kernel_execve)
-
-
+END(kernel_execve)
 
 	/* runs on exception stack */
 KPROBE_ENTRY(nmi)
@@ -1460,14 +1458,14 @@ ENTRY(call_softirq)
 	decl %gs:pda_irqcount
 	ret
 	CFI_ENDPROC
-ENDPROC(call_softirq)
+END(call_softirq)
 
 KPROBE_ENTRY(ignore_sysret)
 	CFI_STARTPROC
 	mov $-ENOSYS,%eax
 	sysret
 	CFI_ENDPROC
-ENDPROC(ignore_sysret)
+KPROBE_END(ignore_sysret)
 
 #ifdef CONFIG_XEN
 zeroentry xen_hypervisor_callback xen_do_hypervisor_callback
-- 
1.5.4.3
--
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