From edf07417be431ec36c340e21c6c4b6d51eb74363 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Tue, 12 Jun 2007 09:47:03 -0600
Subject: [PATCH] Fix TEXREL issues when using GLX_USE_TLS (see bug 7459).

---
 src/mesa/glapi/gl_x86_asm.py | 15 ++++++++++++---
 src/mesa/glapi/glapi.c       | 20 +++++++++++---------
 src/mesa/x86/glapi_x86.S     | 14 +++++++++++---
 3 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/src/mesa/glapi/gl_x86_asm.py b/src/mesa/glapi/gl_x86_asm.py
index 650331a..403e872 100644
--- a/src/mesa/glapi/gl_x86_asm.py
+++ b/src/mesa/glapi/gl_x86_asm.py
@@ -82,12 +82,18 @@ class PrintGenericStubs(gl_XML.gl_print_base):
 		print ''
 		print '#ifdef GLX_USE_TLS'
 		print ''
+		print '#ifdef GLX_X86_READONLY_TEXT'
+		print '# define CTX_INSNS MOV_L(GS:(EAX), EAX)'
+		print '#else'
+		print '# define CTX_INSNS NOP /* Pad for init_glapi_relocs() */'
+		print '#endif'
+		print ''
 		print '#  define GL_STUB(fn,off,fn_alt)\t\t\t\\'
 		print 'ALIGNTEXT16;\t\t\t\t\t\t\\'
 		print 'GLOBL_FN(GL_PREFIX(fn, fn_alt));\t\t\t\\'
 		print 'GL_PREFIX(fn, fn_alt):\t\t\t\t\t\\'
 		print '\tCALL(_x86_get_dispatch) ;\t\t\t\\'
-		print '\tNOP ;\t\t\t\t\t\t\\'
+		print '\tCTX_INSNS ;					\\'
 		print '\tJMP(GL_OFFSET(off))'
 		print ''
 		print '#elif defined(PTHREADS)'
@@ -138,7 +144,10 @@ class PrintGenericStubs(gl_XML.gl_print_base):
 		print '\tHIDDEN(GLNAME(_x86_get_dispatch))'
 		print 'ALIGNTEXT16'
 		print 'GLNAME(_x86_get_dispatch):'
-		print '\tmovl\t%gs:_glapi_tls_Dispatch@NTPOFF, %eax'
+		print '\tcall	1f'
+		print '1:\tpopl	%eax'
+		print '\taddl	$_GLOBAL_OFFSET_TABLE_+[.-1b], %eax'
+		print '\tmovl	_glapi_tls_Dispatch@GOTNTPOFF(%eax), %eax'
 		print '\tret'
 		print ''
 		print '#elif defined(PTHREADS)'
@@ -158,7 +167,7 @@ class PrintGenericStubs(gl_XML.gl_print_base):
 		print '#endif'
 		print ''
 
-		print '#if defined( GLX_USE_TLS )'
+		print '#if defined( GLX_USE_TLS ) && !defined( GLX_X86_READONLY_TEXT )'
 		print '\t\t.section\twtext, "awx", @progbits'
 		print '#endif /* defined( GLX_USE_TLS ) */'
 
diff --git a/src/mesa/glapi/glapi.c b/src/mesa/glapi/glapi.c
index 5815dbf..47c5782 100644
--- a/src/mesa/glapi/glapi.c
+++ b/src/mesa/glapi/glapi.c
@@ -1028,22 +1028,24 @@ _glapi_check_table(const struct _glapi_table *table)
 #if defined(PTHREADS) || defined(GLX_USE_TLS)
 /**
  * Perform platform-specific GL API entry-point fixups.
- * 
- * 
  */
 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 */
+    };
+    GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
+    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 ) */
-}
 #endif
+}
+#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */
diff --git a/src/mesa/x86/glapi_x86.S b/src/mesa/x86/glapi_x86.S
index bdf42ac..74e9372 100644
--- a/src/mesa/x86/glapi_x86.S
+++ b/src/mesa/x86/glapi_x86.S
@@ -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 @@ SEG_TEXT
 	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 @@ GLNAME(_x86_get_dispatch):
 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 ) */
 
-- 
2.7.4