No more TEXTREL for libGL on x86 v3

6.5.2-no-textrel-tls-x86.patch (text/plain), 2.17 KB, created by Joakim Tjernlund on 2007-05-03 13:48:24 UTC

--- ./src/mesa/glapi/glapi.c.org	2007-05-02 13:33:59.000000000 +0200
+++ ./src/mesa/glapi/glapi.c	2007-05-03 15:43:02.000000000 +0200
@@ -1035,14 +1035,17 @@
 static void
 init_glapi_relocs( void )
 {
-#if defined( USE_X86_ASM ) && defined( GLX_USE_TLS )
-    extern void * _x86_get_dispatch(void);
-    const GLubyte * const get_disp = (const GLubyte *) _x86_get_dispatch;
+#if defined( USE_X86_ASM ) && defined( GLX_USE_TLS )\
+ && !defined( GLX_X86_READONLY_TEXT )
+    extern unsigned long _x86_get_dispatch(void);
+    char run_time_patch[] = {0x65, 0xa1, 0, 0, 0, 0};/* movl %gs:0,%eax */
+    unsigned long *offset = (unsigned long *) &run_time_patch[2];
+    const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
     GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
 
-
+    *offset = _x86_get_dispatch();
     while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
-	(void) memcpy( curr_func, get_disp, 6 );
+	(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
 	curr_func += DISPATCH_FUNCTION_SIZE;
     }
 #endif /* defined( USE_X86_ASM ) && defined( GLX_USE_TLS ) */
--- ./src/mesa/x86/glapi_x86.S.org	2007-04-28 16:21:10.000000000 +0200
+++ ./src/mesa/x86/glapi_x86.S	2007-05-03 10:07:01.000000000 +0200
@@ -58,12 +58,17 @@
 
 #ifdef GLX_USE_TLS
 
+#ifdef GLX_X86_READONLY_TEXT
+# define CTX_INSNS MOV_L(GS:(EAX), EAX)
+#else
+# define CTX_INSNS NOP /* Pad for init_glapi_relocs() */
+#endif
 #  define GL_STUB(fn,off,fn_alt)			\
 ALIGNTEXT16;						\
 GLOBL_FN(GL_PREFIX(fn, fn_alt));			\
 GL_PREFIX(fn, fn_alt):					\
 	CALL(_x86_get_dispatch) ;			\
-	NOP ;						\
+	CTX_INSNS ;					\
 	JMP(GL_OFFSET(off))
 
 #elif defined(PTHREADS)
@@ -114,7 +119,10 @@
 	HIDDEN(GLNAME(_x86_get_dispatch))
 ALIGNTEXT16
 GLNAME(_x86_get_dispatch):
-	movl	%gs:_glapi_tls_Dispatch@NTPOFF, %eax
+	call	1f
+1:	popl	%eax
+	addl	$_GLOBAL_OFFSET_TABLE_+[.-1b], %eax
+	movl	_glapi_tls_Dispatch@GOTNTPOFF(%eax), %eax
 	ret
 
 #elif defined(PTHREADS)
@@ -133,7 +141,7 @@
 EXTERN GLNAME(_glapi_get_dispatch)
 #endif
 
-#if defined( GLX_USE_TLS )
+#if defined( GLX_USE_TLS ) && !defined( GLX_X86_READONLY_TEXT )
 		.section	wtext, "awx", @progbits
 #endif /* defined( GLX_USE_TLS ) */