linux-kernel - [PATCH 4/8] AVR32: Fix oversize immediates in atomic.h

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <11616775661978-git-send-email-hskinnemoen@atmel.com>
Date:	Tue, 24 Oct 2006 10:12:42 +0200
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	torvalds@...l.org
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: [PATCH 4/8] AVR32: Fix oversize immediates in atomic.h

When calling e.g. atomic_sub_return with a large constant, the
compiler may output an immediate that is too large for the sub
instruction in the middle of the loop.

Fix this by explicitly specifying the number of bits allowed in the
constraint. Also stop atomic_add_return() and friends from falling
back to their respective "sub" variants if the constant is too large
to fit in an immediate.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
---
 include/asm-avr32/atomic.h |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/asm-avr32/atomic.h b/include/asm-avr32/atomic.h
index e0b9c44..c40b603 100644
--- a/include/asm-avr32/atomic.h
+++ b/include/asm-avr32/atomic.h
@@ -41,7 +41,7 @@ static inline int atomic_sub_return(int 
 		"	stcond	%1, %0\n"
 		"	brne	1b"
 		: "=&r"(result), "=o"(v->counter)
-		: "m"(v->counter), "ir"(i)
+		: "m"(v->counter), "rKs21"(i)
 		: "cc");
 
 	return result;
@@ -58,7 +58,7 @@ static inline int atomic_add_return(int 
 {
 	int result;
 
-	if (__builtin_constant_p(i))
+	if (__builtin_constant_p(i) && (i >= -1048575) && (i <= 1048576))
 		result = atomic_sub_return(-i, v);
 	else
 		asm volatile(
@@ -101,7 +101,7 @@ static inline int atomic_sub_unless(atom
 		"	mov	%1, 1\n"
 		"1:"
 		: "=&r"(tmp), "=&r"(result), "=o"(v->counter)
-		: "m"(v->counter), "ir"(a), "ir"(u)
+		: "m"(v->counter), "rKs21"(a), "rKs21"(u)
 		: "cc", "memory");
 
 	return result;
@@ -121,7 +121,7 @@ static inline int atomic_add_unless(atom
 {
 	int tmp, result;
 
-	if (__builtin_constant_p(a))
+	if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576))
 		result = atomic_sub_unless(v, -a, u);
 	else {
 		result = 0;
-- 
1.4.1.1

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/