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From: "mikpe at it dot uu dot se" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/44290] [4.5 Regression] arm linux kernel crahes when built with -fipa-sra, __naked attribute is broken Date: Sat, 29 May 2010 14:27:00 -0000 [thread overview] Message-ID: <20100529142727.16632.qmail@sourceware.org> (raw) In-Reply-To: <bug-44290-10179@http.gcc.gnu.org/bugzilla/> ------- Comment #13 from mikpe at it dot uu dot se 2010-05-29 14:27 ------- (In reply to comment #10) > Or rather, if you have > > void __attribute__((naked)) foo (int i) > { > asm("use i"); > } > > without any inputs refering to i that is invalid. Not according to gcc/doc/extend.texi: > @item naked > @cindex function without a prologue/epilogue code > Use this attribute on the ARM, AVR, IP2K, RX and SPU ports to indicate that > the specified function does not need prologue/epilogue sequences generated by > the compiler. It is up to the programmer to provide these sequences. The > only statements that can be safely included in naked functions are > @code{asm} statements that do not have operands. Note: "do not have operands". Thus the only way such an asm() can refer to parameters is by assuming a standard function call sequence and hardcoding corresponding register numbers or stack frame offsets. However, even if the asm() refers to those parameters via "r"(...) inputs, gcc-4.5 changes the register assignment to not agree with the standard call sequence, I'll attach a small test case showing that in a moment. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
next prev parent reply other threads:[~2010-05-29 14:27 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com 2010-05-27 7:07 ` [Bug tree-optimization/44290] " raj dot khem at gmail dot com 2010-05-27 7:13 ` raj dot khem at gmail dot com 2010-05-27 10:41 ` [Bug tree-optimization/44290] [4.5 Regression] " rguenth at gcc dot gnu dot org 2010-05-27 17:26 ` raj dot khem at gmail dot com 2010-05-27 17:27 ` raj dot khem at gmail dot com 2010-05-28 11:49 ` mikpe at it dot uu dot se 2010-05-28 22:03 ` mikpe at it dot uu dot se 2010-05-29 11:36 ` mikpe at it dot uu dot se 2010-05-29 11:43 ` [Bug target/44290] [4.5 Regression] arm linux kernel crahes when built with -fipa-sra, __naked attribute is broken rguenth at gcc dot gnu dot org 2010-05-29 11:47 ` rguenth at gcc dot gnu dot org 2010-05-29 11:50 ` rguenth at gcc dot gnu dot org 2010-05-29 13:30 ` Andrew Pinski 2010-05-29 13:30 ` pinskia at gmail dot com 2010-05-29 14:27 ` mikpe at it dot uu dot se [this message] 2010-05-29 14:40 ` mikpe at it dot uu dot se 2010-05-29 14:45 ` [Bug target/44290] [4.5 Regression] " rguenth at gcc dot gnu dot org 2010-05-29 14:46 ` rguenth at gcc dot gnu dot org 2010-05-29 14:47 ` mikpe at it dot uu dot se 2010-05-29 18:00 ` mikpe at it dot uu dot se 2010-05-30 5:58 ` raj dot khem at gmail dot com 2010-05-30 6:55 ` raj dot khem at gmail dot com 2010-05-30 17:04 ` rguenth at gcc dot gnu dot org 2010-07-23 14:48 ` jiez at gcc dot gnu dot org 2010-07-23 14:51 ` jiez at gcc dot gnu dot org 2010-07-23 14:52 ` jiez at gcc dot gnu dot org 2010-07-26 8:05 ` [Bug target/44290] [4.5 only] " ramana at gcc dot gnu dot org 2010-07-26 14:38 ` jiez at gcc dot gnu dot org 2010-07-27 17:34 ` jiez at gcc dot gnu dot org 2010-07-31 9:35 ` rguenth at gcc dot gnu dot org
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