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Date: Thu, 10 Jan 2008 16:59:52 -0800
From: John Reiser <jreiser@...Wagon.com>
To: Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
Jeff Dike <jdike@...toit.com>
CC: Sam Ravnborg <sam@...nborg.org>, tglx@...utronix.de,
linux-kernel@...r.kernel.org
Subject: Re: STT_FUNC for assembler checksum and semaphore ops" in git-x86
Andi Kleen wrote:
> But actually checking the default implementation in linkage.h already
> implements size: [snip]
> Are you sure it doesn't work? Your patch should be not needed. If it's
> still wrong then just ENDPROCs() need to be added.
The ENDPROCs() were not used everywhere. Some code used just END() instead,
while other code used nothing. um/sys-i386/checksum.S didn't #include
<linux/linkage.h> . I also got confused because gcc puts the
.type near the ENTRY, while ENDPROC puts it on the opposite end.
Here is a revised patch against linux-2.6-x86.git , including a comment
in linkage.h which explains one motivation. PowerPC is different
("_GLOBAL" instead of "ENTRY") and foreign to me, so I left it alone.
Signed off by: John Reiser <jreiser@...Wagon.com>
diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index ff203dd..024cfab 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -53,6 +53,10 @@
.size name, .-name
#endif
+/* If symbol 'name' is treated as a subroutine (gets called, and returns)
+ * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
+ * static analysis tools such as stack depth analyzer.
+ */
#ifndef ENDPROC
#define ENDPROC(name) \
.type name, @function; \
diff --git a/arch/x86/lib/semaphore_32.S b/arch/x86/lib/semaphore_32.S
index 444fba4..e2c6e0d 100644
--- a/arch/x86/lib/semaphore_32.S
+++ b/arch/x86/lib/semaphore_32.S
@@ -49,7 +49,7 @@ ENTRY(__down_failed)
ENDFRAME
ret
CFI_ENDPROC
- END(__down_failed)
+ ENDPROC(__down_failed)
ENTRY(__down_failed_interruptible)
CFI_STARTPROC
@@ -70,7 +70,7 @@ ENTRY(__down_failed_interruptible)
ENDFRAME
ret
CFI_ENDPROC
- END(__down_failed_interruptible)
+ ENDPROC(__down_failed_interruptible)
ENTRY(__down_failed_trylock)
CFI_STARTPROC
@@ -91,7 +91,7 @@ ENTRY(__down_failed_trylock)
ENDFRAME
ret
CFI_ENDPROC
- END(__down_failed_trylock)
+ ENDPROC(__down_failed_trylock)
ENTRY(__up_wakeup)
CFI_STARTPROC
@@ -112,7 +112,7 @@ ENTRY(__up_wakeup)
ENDFRAME
ret
CFI_ENDPROC
- END(__up_wakeup)
+ ENDPROC(__up_wakeup)
/*
* rw spinlock fallbacks
@@ -132,7 +132,7 @@ ENTRY(__write_lock_failed)
ENDFRAME
ret
CFI_ENDPROC
- END(__write_lock_failed)
+ ENDPROC(__write_lock_failed)
ENTRY(__read_lock_failed)
CFI_STARTPROC
@@ -148,7 +148,7 @@ ENTRY(__read_lock_failed)
ENDFRAME
ret
CFI_ENDPROC
- END(__read_lock_failed)
+ ENDPROC(__read_lock_failed)
#endif
@@ -170,7 +170,7 @@ ENTRY(call_rwsem_down_read_failed)
CFI_ADJUST_CFA_OFFSET -4
ret
CFI_ENDPROC
- END(call_rwsem_down_read_failed)
+ ENDPROC(call_rwsem_down_read_failed)
ENTRY(call_rwsem_down_write_failed)
CFI_STARTPROC
@@ -182,7 +182,7 @@ ENTRY(call_rwsem_down_write_failed)
CFI_ADJUST_CFA_OFFSET -4
ret
CFI_ENDPROC
- END(call_rwsem_down_write_failed)
+ ENDPROC(call_rwsem_down_write_failed)
ENTRY(call_rwsem_wake)
CFI_STARTPROC
@@ -196,7 +196,7 @@ ENTRY(call_rwsem_wake)
CFI_ADJUST_CFA_OFFSET -4
1: ret
CFI_ENDPROC
- END(call_rwsem_wake)
+ ENDPROC(call_rwsem_wake)
/* Fix up special calling conventions */
ENTRY(call_rwsem_downgrade_wake)
@@ -214,6 +214,6 @@ ENTRY(call_rwsem_downgrade_wake)
CFI_ADJUST_CFA_OFFSET -4
ret
CFI_ENDPROC
- END(call_rwsem_downgrade_wake)
+ ENDPROC(call_rwsem_downgrade_wake)
#endif
diff --git a/arch/um/sys-i386/checksum.S b/arch/um/sys-i386/checksum.S
index 62c7e56..4f3f62b 100644
--- a/arch/um/sys-i386/checksum.S
+++ b/arch/um/sys-i386/checksum.S
@@ -26,6 +26,7 @@
*/
#include <asm/errno.h>
+#include <linux/linkage.h>
/*
* computes a partial checksum, e.g. for TCP/UDP fragments
@@ -48,7 +49,7 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
* Fortunately, it is easy to convert 2-byte alignment to 4-byte
* alignment for the unrolled loop.
*/
-csum_partial:
+ENTRY(csum_partial)
pushl %esi
pushl %ebx
movl 20(%esp),%eax # Function arg: unsigned int sum
@@ -113,12 +114,13 @@ csum_partial:
popl %ebx
popl %esi
ret
+ ENDPROC(csum_partial)
#else
/* Version for PentiumII/PPro */
-csum_partial:
+ENTRY(csum_partial)
pushl %esi
pushl %ebx
movl 20(%esp),%eax # Function arg: unsigned int sum
@@ -211,6 +213,7 @@ csum_partial:
popl %ebx
popl %esi
ret
+ ENDPROC(csum_partial)
#endif
@@ -250,7 +253,7 @@ unsigned int csum_partial_copy_generic (const char *src, char *dst,
#define ARGBASE 16
#define FP 12
-csum_partial_copy_generic_i386:
+ENTRY(csum_partial_copy_generic_i386)
subl $4,%esp
pushl %edi
pushl %esi
@@ -368,6 +371,7 @@ DST( movb %cl, (%edi) )
popl %edi
popl %ecx # equivalent to addl $4,%esp
ret
+ ENDPROC(csum_partial_copy_generic_i386)
#else
@@ -385,7 +389,7 @@ DST( movb %cl, (%edi) )
#define ARGBASE 12
-csum_partial_copy_generic_i386:
+ENTRY(csum_partial_copy_generic_i386)
pushl %ebx
pushl %edi
pushl %esi
@@ -452,6 +456,7 @@ DST( movb %dl, (%edi) )
popl %edi
popl %ebx
ret
+ ENDPROC(csum_partial_copy_generic_i386)
#undef ROUND
#undef ROUND1
diff --git a/arch/m32r/lib/checksum.S b/arch/m32r/lib/checksum.S
index 0af0360..2492222 100644
--- a/arch/m32r/lib/checksum.S
+++ b/arch/m32r/lib/checksum.S
@@ -153,6 +153,7 @@ ENTRY(csum_partial)
addx r0, r2 || ldi r2, #0
addx r0, r2
jmp r14
+ ENDPROC(csum_partial)
#else /* not CONFIG_ISA_DUAL_ISSUE */
@@ -288,6 +289,7 @@ ENTRY(csum_partial)
ldi r2, #0
addx r0, r2
jmp r14
+ ENDPROC(csum_partial)
#endif /* not CONFIG_ISA_DUAL_ISSUE */
@@ -316,5 +318,6 @@ ENTRY(csum_partial_copy_generic)
nop
nop
nop
+ ENDPROC(csum_partial_copy_generic)
.end
diff --git a/arch/m68k/lib/semaphore.S b/arch/m68k/lib/semaphore.S
index 0215624..f28889c 100644
--- a/arch/m68k/lib/semaphore.S
+++ b/arch/m68k/lib/semaphore.S
@@ -22,6 +22,7 @@ ENTRY(__down_failed)
movel (%sp)+,%a1
moveml (%sp)+,%a0/%d0/%d1
rts
+ ENDPROC(__down_failed)
ENTRY(__down_failed_interruptible)
movel %a0,-(%sp)
@@ -32,6 +33,7 @@ ENTRY(__down_failed_interruptible)
movel (%sp)+,%d1
movel (%sp)+,%a0
rts
+ ENDPROC(__down_failed_interruptible)
ENTRY(__down_failed_trylock)
movel %a0,-(%sp)
@@ -42,6 +44,7 @@ ENTRY(__down_failed_trylock)
movel (%sp)+,%d1
movel (%sp)+,%a0
rts
+ ENDPROC(__down_failed_trylock)
ENTRY(__up_wakeup)
moveml %a0/%d0/%d1,-(%sp)
@@ -50,4 +53,5 @@ ENTRY(__up_wakeup)
movel (%sp)+,%a1
moveml (%sp)+,%a0/%d0/%d1
rts
+ ENDPROC(__up_wakeup)
diff --git a/arch/m68knommu/lib/semaphore.S b/arch/m68knommu/lib/semaphore.S
index 87c7460..e4bcb07 100644
--- a/arch/m68knommu/lib/semaphore.S
+++ b/arch/m68knommu/lib/semaphore.S
@@ -30,6 +30,7 @@ ENTRY(__down_failed)
movel (%sp)+,%d0
movel (%sp)+,%d1
rts
+ ENDPROC(__down_failed)
ENTRY(__down_failed_interruptible)
movel %a0,-(%sp)
@@ -39,6 +40,7 @@ ENTRY(__down_failed_interruptible)
movel (%sp)+,%a1
movel (%sp)+,%d1
rts
+ ENDPROC(__down_failed_interruptible)
ENTRY(__up_wakeup)
#ifdef CONFIG_COLDFIRE
@@ -53,6 +55,7 @@ ENTRY(__up_wakeup)
movel (%sp)+,%d0
movel (%sp)+,%d1
rts
+ ENDPROC(__up_wakeup)
ENTRY(__down_failed_trylock)
movel %a0,-(%sp)
@@ -63,4 +66,5 @@ ENTRY(__down_failed_trylock)
movel (%sp)+,%d1
movel (%sp)+,%a0
rts
+ ENDPROC(__down_failed_trylock)
diff --git a/arch/sh/lib/checksum.S b/arch/sh/lib/checksum.S
index cbdd0d4..c7a41de 100644
--- a/arch/sh/lib/checksum.S
+++ b/arch/sh/lib/checksum.S
@@ -143,6 +143,7 @@ ENTRY(csum_partial)
9:
rts
mov r6, r0
+ ENDPROC(csum_partial)
/*
unsigned int csum_partial_copy_generic (const char *src, char *dst, int len,
@@ -384,3 +385,4 @@ DST( mov.b r0,@r5 )
add #8,r15
rts
mov r7,r0
+ ENDPROC(csum_partial_copy_generic)
diff --git a/arch/xtensa/lib/checksum.S b/arch/xtensa/lib/checksum.S
index 9d9cd99..9d12ade 100644
--- a/arch/xtensa/lib/checksum.S
+++ b/arch/xtensa/lib/checksum.S
@@ -169,6 +169,7 @@ ENTRY(csum_partial)
addi a2, a2, 2
3:
j 5b /* branch to handle the remaining byte */
+ ENDPROC(csum_partial)
@@ -406,4 +407,5 @@ DST( s8i a8, a3, 1 )
retw
.previous
+ ENDPROC(csum_partial_copy_generic)
--
John Reiser, jreiser@...Wagon.com
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