[Patch] INITIALIZE_TRAMPOLINE on arm--netbsd

[Krister Walfridsson]

Nested functions does not work on arm--netbsd because of the instruction
cache not being flushed. This is implemented in the patch below, in
essentially the same way as is done in linux-gas.h.

Bootstrapped and regtested on arm-unknown-netbsd1.5Y (where it fixes
40 test failures.)

Ok to install?

   /Krister


2002-09-07  Krister Walfridsson  <cato@df.lth.se>

	* config/arm/netbsd.h (INITIALIZE_TRAMPOLINE): Redefine.
	(CLEAR_INSN_CACHE): Define.


Index: netbsd.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/arm/netbsd.h,v
retrieving revision 1.19
diff -c -r1.19 netbsd.h
*** netbsd.h	29 May 2002 21:31:48 -0000	1.19
--- netbsd.h	7 Sep 2002 18:40:33 -0000
***************
*** 147,149 ****
--- 147,176 ----
     requirements.  */
  #undef  DEFAULT_STRUCTURE_SIZE_BOUNDARY
  #define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8
+
+ /* Emit code to set up a trampoline and synchronise the caches.  */
+ #undef  INITIALIZE_TRAMPOLINE
+ #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                      \
+ {                                                                      \
+   emit_move_insn (gen_rtx (MEM, SImode, plus_constant ((TRAMP), 8)),   \
+                  (CXT));                                               \
+   emit_move_insn (gen_rtx (MEM, SImode, plus_constant ((TRAMP), 12)),  \
+                  (FNADDR));                                            \
+   emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"),      \
+                     0, VOIDmode, 2, TRAMP, Pmode,                      \
+                     plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);    \
+ }
+
+ /* Clear the instruction cache from `BEG' to `END'.  This makes a
+    call to the ARM32_SYNC_ICACHE architecture specific syscall.  */
+ #define CLEAR_INSN_CACHE(BEG, END)                                     \
+ {                                                                      \
+   extern int sysarch(int number, void *args);                          \
+   struct {                                                             \
+     unsigned int  addr;                                                \
+     int           len;                                                 \
+   } s;                                                                 \
+   s.addr = (unsigned int)(BEG);                                        \
+   s.len = (END) - (BEG);                                               \
+   (void)sysarch(0, &s);                                                \
+ }