From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <java-prs-return-11353-listarch-java-prs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 1569 invoked by alias); 30 Jan 2012 23:05:14 -0000
Received: (qmail 1550 invoked by uid 22791); 30 Jan 2012 23:05:13 -0000
X-SWARE-Spam-Status: No, hits=-2.8 required=5.0
	tests=ALL_TRUSTED,AWL,BAYES_00,TW_IB,TW_ZJ
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)
    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 30 Jan 2012 23:05:01 +0000
From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: java-prs@gcc.gnu.org
Subject: [Bug libgcj/51500] [4.7 regression] 106 unexpected libjava testsuite
 failures with mingw32
Date: Mon, 30 Jan 2012 23:05:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libgcj
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ubizjak at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P4
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.7.0
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-51500-8172-iGcGR2VSxK@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-51500-8172@http.gcc.gnu.org/bugzilla/>
References: <bug-51500-8172@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact java-prs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <java-prs.gcc.gnu.org>
List-Subscribe: <mailto:java-prs-subscribe@gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/java-prs/>
List-Post: <mailto:java-prs@gcc.gnu.org>
List-Help: <mailto:java-prs-help@gcc.gnu.org>, <http://gcc.gnu.org/ml/#faqs>
Sender: java-prs-owner@gcc.gnu.org
X-SW-Source: 2012-q1/txt/msg00058.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51500

--- Comment #16 from Uros Bizjak <ubizjak at gmail dot com> 2012-01-30 23:04:54 UTC ---
(In reply to comment #15)

> #define FFI_INIT_TRAMPOLINE_THISCALL(TRAMP,FUN,CTX,SIZE) \
> { unsigned char *__tramp = (unsigned char*)(TRAMP); \
>    unsigned int  __fun = (unsigned int)(FUN); \
>    unsigned int  __ctx = (unsigned int)(CTX); \
>    unsigned int  __dis = __fun - (__ctx + 22);  \
>    *(unsigned int *) &__tramp[0] = 0x8924048b; /* mov (%esp), %eax */ \
>    *(unsigned int *) &__tramp[4] = 0xec83240c; /* mov %ecx, (%esp) */ \
>    *(unsigned int *) &__tramp[8] = 0x24048904; /* sub $4,(%esp) */ \
>                               /* mov %eax, (%esp) */ \
>    *(unsigned char*) &__tramp[12] = 0xb8; \
>    *(unsigned int*)  &__tramp[13] = __ctx; /* movl __ctx, %eax */ \
>    *(unsigned char *)  &__tramp[17] = 0xe8; \
>    *(unsigned int*)  &__tramp[18] = __dis; /* call __fun  */ \
>    *(unsigned int*)  &__tramp[22] = 0x83240c8b; /* mov (%esp), %ecx */ \
>    *(unsigned int*)  &__tramp[26] = 0x0c8904c4; /* add $4, %esp */ \
>    *(unsigned char*) &__tramp[30] = 0x24;    /* mov %ecx, (%esp) */ \
>    *(unsigned short*)  &__tramp[31] = 0xc3; /* ret  */ \
>  }

IMO, you will need to keep 16byte stack alignment at function call, so:

movl (%esp), %eax
movl %ecx, (%esp)
subl $12, %esp
movl %eax, (%esp)
movl __ctx, %eax
call fun
mov (%esp), %ecx
addl $16, %esp
jmp *%ecx