sol2-sld-64.h (TRANSFER_FROM_TRAMPOLINE): Rework for efficiency by checking…

sol2-sld-64.h (TRANSFER_FROM_TRAMPOLINE): Rework for efficiency by checking whether we need to modify the current stack...

	* config/sparc/sol2-sld-64.h (TRANSFER_FROM_TRAMPOLINE): Rework
	for efficiency by checking whether we need to modify the current
	stack permission at all.
	(ASM_OUTPUT_CONSTRUCTOR, ASM_OUTPUT_DESTRUCTOR): Define.
	* config/sparc/sparc.c (sparc_initialize_trampoline): Emit
	__enable_execute_stack libcall here too if
	TRANSFER_FROM_TRAMPOLINE is defined.
	* config/sparc/sparc.h: Set TARGET_ARCH32 to a constant if
	IN_LIBGCC2.

From-SVN: r22880

gcc/ChangeLog

+Wed Oct  7 02:05:20 1998  David S. Miller  <davem@pierdol.cobaltmicro.com>
+
+	* config/sparc/sol2-sld-64.h (TRANSFER_FROM_TRAMPOLINE): Rework
+	for efficiency by checking whether we need to modify the current
+	stack permission at all.
+	(ASM_OUTPUT_CONSTRUCTOR, ASM_OUTPUT_DESTRUCTOR): Define.
+	* config/sparc/sparc.c (sparc_initialize_trampoline): Emit
+	__enable_execute_stack libcall here too if
+	TRANSFER_FROM_TRAMPOLINE is defined.
+	* config/sparc/sparc.h: Set TARGET_ARCH32 to a constant if
+	IN_LIBGCC2.
+
 Wed Oct  7 02:27:52 1998  Jeffrey A Law  (law@cygnus.com)
 
 	* Makefile.in (DRIVER_DEFINES): Remove last change.

gcc/config/sparc/sol2-sld-64.h

@@ -293,22 +293,71 @@
    
 #undef MD_STARTFILE_PREFIX
 #define MD_STARTFILE_PREFIX "/usr/lib/sparcv9/"
+ 
+#endif /* ! SPARC_BI_ARCH */
+
+/*
+ * Attempt to turn on access permissions for the stack.
+ *
+ * This code must be defined when compiling gcc but not when compiling
+ * libgcc2.a, unless we're generating code for 64 bits SPARC
+ *
+ * _SC_STACK_PROT is only defined for post 2.6, but we want this code
+ * to run always.  2.6 can change the stack protection but has no way to
+ * query it.
+ *
+ */
 
-/* Attempt to turn on access permissions for the stack.  */
-
-#define TRANSFER_FROM_TRAMPOLINE                                       \
-void                                                                   \
-__enable_execute_stack (addr)                                          \
-     void *addr;                                                       \
-{                                                                      \
-  long size = getpagesize ();                                          \
-  long mask = ~(size-1);                                               \
-  char *page = (char *) (((long) addr) & mask);                               \
-  char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
-                                                                       \
-  /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */                               \
-  if (mprotect (page, end - page, 7) < 0)                              \
-    perror ("mprotect of trampoline code");                            \
+#define TRANSFER_FROM_TRAMPOLINE					\
+static int need_enable_exec_stack;					\
+									\
+static void check_enabling(void) __attribute__ ((constructor));		\
+static void check_enabling(void)					\
+{									\
+  extern long sysconf(int);						\
+									\
+  int prot = (int) sysconf(515 /*_SC_STACK_PROT */);			\
+  if (prot != 7)							\
+    need_enable_exec_stack = 1;						\
+}									\
+									\
+void									\
+__enable_execute_stack (addr)						\
+     void *addr;							\
+{									\
+  if (!need_enable_exec_stack)						\
+    return;								\
+  else {								\
+    long size = getpagesize ();						\
+    long mask = ~(size-1);						\
+    char *page = (char *) (((long) addr) & mask); 			\
+    char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
+									\
+    /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */ 			\
+    if (mprotect (page, end - page, 7) < 0)				\
+      perror ("mprotect of trampoline code");				\
+  }									\
 }
-   
-#endif /* ! SPARC_BI_ARCH */
+
+/* A C statement (sans semicolon) to output an element in the table of
+   global constructors.  */
+#undef ASM_OUTPUT_CONSTRUCTOR
+#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)				\
+  do {									\
+    ctors_section ();							\
+    fprintf (FILE, "\t%s\t ", TARGET_ARCH64 ? ASM_LONGLONG : INT_ASM_OP); \
+    assemble_name (FILE, NAME);						\
+    fprintf (FILE, "\n");						\
+  } while (0)
+
+/* A C statement (sans semicolon) to output an element in the table of
+   global destructors.  */
+#undef ASM_OUTPUT_DESTRUCTOR
+#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)       				\
+  do {									\
+    dtors_section ();                   				\
+    fprintf (FILE, "\t%s\t ", TARGET_ARCH64 ? ASM_LONGLONG : INT_ASM_OP); \
+    assemble_name (FILE, NAME);              				\
+    fprintf (FILE, "\n");						\
+  } while (0)
+

gcc/config/sparc/sparc.c

@@ -5438,6 +5438,10 @@ sparc_initialize_trampoline (tramp, fnaddr, cxt)
     SETHI i,r  = 00rr rrr1 00ii iiii iiii iiii iiii iiii
     JMPL r+i,d = 10dd ddd1 1100 0rrr rr1i iiii iiii iiii
    */
+#ifdef TRANSFER_FROM_TRAMPOLINE
+  emit_library_call (gen_rtx (SYMBOL_REF, Pmode, "__enable_execute_stack"),
+                     0, VOIDmode, 1, tramp, Pmode);
+#endif
 
   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, 0)),
 		  expand_binop (SImode, ior_optab,

gcc/config/sparc/sparc.h

@@ -34,10 +34,18 @@ Boston, MA 02111-1307, USA.  */
    architectures to compile for.  We allow targets to choose compile time or
    runtime selection.  */
 #ifdef SPARC_BI_ARCH
+#ifdef IN_LIBGCC2
+#if defined(__sparcv9) || defined(__sparcv_v9) || defined(__arch64__)
+#define TARGET_ARCH32 0
+#else
+#define TARGET_ARCH32 1
+#endif /* V9 sparc */
+#else
 #define TARGET_ARCH32 (! TARGET_64BIT)
+#endif /* IN_LIBGCC2 */
 #else
 #define TARGET_ARCH32 (DEFAULT_ARCH32_P)
-#endif
+#endif /* SPARC_BI_ARCH */
 #define TARGET_ARCH64 (! TARGET_ARCH32)
 
 /* Code model selection.