wine/tools/winebuild relay.c
Alexandre Julliard
julliard at wine.codeweavers.com
Mon Nov 28 14:10:56 CST 2005
ChangeSet ID: 21506
CVSROOT: /opt/cvs-commit
Module name: wine
Changes by: julliard at winehq.org 2005/11/28 14:10:56
Modified files:
tools/winebuild: relay.c
Log message:
Enforce 16-byte stack alignment when returning from 16-bit code and
when calling a register function.
Patch: http://cvs.winehq.org/patch.py?id=21506
Old revision New revision Changes Path
1.52 1.53 +18 -7 wine/tools/winebuild/relay.c
Index: wine/tools/winebuild/relay.c
diff -u -p wine/tools/winebuild/relay.c:1.52 wine/tools/winebuild/relay.c:1.53
--- wine/tools/winebuild/relay.c:1.52 28 Nov 2005 20:10:56 -0000
+++ wine/tools/winebuild/relay.c 28 Nov 2005 20:10:56 -0000
@@ -270,7 +270,16 @@ static void BuildCallFrom16Core( FILE *o
#endif
/* Push address of CONTEXT86 structure -- popped by the relay routine */
- fprintf( outfile, "\tpushl %%esp\n" );
+ fprintf( outfile, "\tmovl %%esp,%%eax\n" );
+ fprintf( outfile, "\tandl $~15,%%esp\n" );
+ fprintf( outfile, "\tsubl $4,%%esp\n" );
+ fprintf( outfile, "\tpushl %%eax\n" );
+ }
+ else
+ {
+ fprintf( outfile, "\tsubl $8,%%esp\n" );
+ fprintf( outfile, "\tandl $~15,%%esp\n" );
+ fprintf( outfile, "\taddl $8,%%esp\n" );
}
/* Call relay routine (which will call the API entry point) */
@@ -726,7 +735,8 @@ static void BuildCallTo32CBClient( FILE
* (ebp+0) saved ebp
* (ebp-128) buffer area to allow stack frame manipulation
* (ebp-332) CONTEXT86 struct
- * (ebp-336) CONTEXT86 *argument
+ * (ebp-336) padding for stack alignment
+ * (ebp-336-n) CONTEXT86 *argument
* .... other arguments copied from (ebp+12)
*
* The entry point routine is called with a CONTEXT* extra argument,
@@ -747,7 +757,7 @@ static void BuildCallFrom32Regs( FILE *o
fprintf( outfile, "\tpushl %%ebp\n" );
fprintf( outfile, "\tmovl %%esp,%%ebp\n ");
- fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE );
+ fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE + 4 /* for context arg */);
/* Build the context structure */
@@ -788,17 +798,18 @@ static void BuildCallFrom32Regs( FILE *o
/* Transfer the arguments */
fprintf( outfile, "\tmovl 4(%%ebp),%%ebx\n" ); /* get relay code addr */
- fprintf( outfile, "\tpushl %%esp\n" ); /* push ptr to context struct */
fprintf( outfile, "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */
- fprintf( outfile, "\tjecxz 1f\n" );
fprintf( outfile, "\tsubl %%ecx,%%esp\n" );
+ fprintf( outfile, "\tandl $~15,%%esp\n" );
fprintf( outfile, "\tleal 16(%%ebp),%%esi\n" ); /* get %esp at time of call */
fprintf( outfile, "\tmovl %%esp,%%edi\n" );
fprintf( outfile, "\tshrl $2,%%ecx\n" );
+ fprintf( outfile, "\tjz 1f\n" );
fprintf( outfile, "\tcld\n" );
fprintf( outfile, "\trep\n\tmovsl\n" ); /* copy args */
-
- fprintf( outfile, "1:\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
+ fprintf( outfile, "1:\tleal %d(%%ebp),%%eax\n", -STACK_SPACE ); /* get addr of context struct */
+ fprintf( outfile, "\tmovl %%eax,(%%edi)\n" ); /* and pass it as extra arg */
+ fprintf( outfile, "\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
fprintf( outfile, "\tleal 16(%%ebp,%%eax),%%eax\n" );
fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
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