$OpenBSD: patch-callback_trampoline_r_trampoline_c,v 1.3 2010/09/23 13:38:33 joshe Exp $

Fix the horrible trampoline code to work on sparc and
sparc64. OpenBSD's runtime linker trashes registers which are supposed
to be preserved across function calls, so steal some space on the
stack instead.

Also fix powerpc and mips64.

--- callback/trampoline_r/trampoline.c.orig	Mon Jan 26 07:00:05 2004
+++ callback/trampoline_r/trampoline.c	Fri Jul 30 14:34:10 2010
@@ -21,7 +21,7 @@
 #endif
 #endif
 #if defined(__rs6000__)
-#if defined(__NetBSD__)
+#if defined(__NetBSD__) || defined(__OpenBSD__)
 #define __rs6000netbsd__
 #else
 #if !defined(_AIX)
@@ -196,8 +196,12 @@ extern RETGETPAGESIZETYPE getpagesize ();
 #ifdef linux
 #include <asm/cachectl.h>
 #else
+#ifdef __OpenBSD__
+#include <mips64/sysarch.h>
+#else
 #ifdef HAVE_SYS_CACHECTL_H
 #include <sys/cachectl.h>
+#endif
 #endif
 #endif
 #endif
@@ -259,11 +259,11 @@ extern void __TR_clear_cache();
 #define TRAMP_ALIGN 8
 #endif
 #if defined(__sparc__) && !defined(__sparc64__)
-#define TRAMP_LENGTH 16
+#define TRAMP_LENGTH 24
 #define TRAMP_ALIGN 16
 #endif
 #ifdef __sparc64__
-#define TRAMP_LENGTH 32
+#define TRAMP_LENGTH 40
 #define TRAMP_ALIGN 16
 #endif
 #ifdef __alpha__
@@ -614,52 +614,64 @@ __TR_function alloc_trampoline_r (address, data0, data
   /* function:
    *    sethi %hi(<data>),%g2		05000000 | (<data> >> 10)
    *    sethi %hi(<address>),%g1	03000000 | (<address> >> 10)
-   *    jmp %g1+%lo(<address>)		81C06000 | (<address> & 0x3ff)
+   *    add %sp,-8,%sp			9C03BFF8
    *    or %g2,%lo(<data>),%g2		8410A000 | (<data> & 0x3ff)
+   *    jmp %g1+%lo(<address>)		81C06000 | (<address> & 0x3ff)
+   *    st %g2,[%sp+96]			C423A060
    */
 #define hi(word)  ((unsigned long) (word) >> 10)
 #define lo(word)  ((unsigned long) (word) & 0x3ff)
   *(long *) (function + 0) = 0x05000000 | hi(data);
   *(long *) (function + 4) = 0x03000000 | hi(address);
-  *(long *) (function + 8) = 0x81C06000 | lo(address);
+  *(long *) (function + 8) = 0x9C03BFF8;
   *(long *) (function +12) = 0x8410A000 | lo(data);
+  *(long *) (function +16) = 0x81C06000 | lo(address);
+  *(long *) (function +20) = 0xC423A060;
 #define is_tramp(function)  \
   (*(long *) (function + 0) & 0xffc00000) == 0x05000000 && \
   (*(long *) (function + 4) & 0xffc00000) == 0x03000000 && \
-  (*(long *) (function + 8) & 0xfffffc00) == 0x81C06000 && \
-  (*(long *) (function +12) & 0xfffffc00) == 0x8410A000
+  (*(long *) (function + 8))              == 0x9C03BFF8 && \
+  (*(long *) (function +12) & 0xfffffc00) == 0x8410A000 && \
+  (*(long *) (function +16) & 0xfffffc00) == 0x81C06000 && \
+  (*(long *) (function +20))              == 0xC423A060
 #define hilo(hiword,loword)  (((hiword) << 10) | ((loword) & 0x3ff))
 #define tramp_address(function)  \
-  hilo(*(long *) (function + 4), *(long *) (function + 8))
+  hilo(*(long *) (function + 4), *(long *) (function +16))
 #define tramp_data(function)  \
   hilo(*(long *) (function + 0), *(long *) (function +12))
 #endif
 #ifdef __sparc64__
   /* function:
    *    rd %pc,%g1			83414000
-   *    ldx [%g1+24],%g2		C4586018
+   *    ldx [%g1+32],%g2		C4586020
+   *    ldx [%g1+24],%g5		CA586018
+   *    add %sp,-32,%sp			9C03BFE0
    *    jmp %g2				81C08000
-   *    ldx [%g1+16],%g5		CA586010
+   *    stx %g5,[%sp+2239]		CA73A8BF
    *    .long high32(<data>)		<data> >> 32
    *    .long low32(<data>)		<data> & 0xffffffff
    *    .long high32(<address>)		<address> >> 32
    *    .long low32(<address>)		<address> & 0xffffffff
    */
   *(int *)  (function + 0) = 0x83414000;
-  *(int *)  (function + 4) = 0xC4586018;
-  *(int *)  (function + 8) = 0x81C08000;
-  *(int *)  (function +12) = 0xCA586010;
-  *(long *) (function +16) = (long) data;
-  *(long *) (function +24) = (long) address;
+  *(int *)  (function + 4) = 0xC4586020;
+  *(int *)  (function + 8) = 0xCA586018;
+  *(int *)  (function +12) = 0x9C03BFE0;
+  *(int *)  (function +16) = 0x81C08000;
+  *(int *)  (function +20) = 0xCA73A8BF;
+  *(long *) (function +24) = (long) data;
+  *(long *) (function +32) = (long) address;
 #define is_tramp(function)  \
   *(int *)  (function + 0) == 0x83414000 && \
-  *(int *)  (function + 4) == 0xC4586018 && \
-  *(int *)  (function + 8) == 0x81C08000 && \
-  *(int *)  (function +12) == 0xCA586010
+  *(int *)  (function + 4) == 0xC4586020 && \
+  *(int *)  (function + 8) == 0xCA586018 && \
+  *(int *)  (function +12) == 0x9C03BFE0 && \
+  *(int *)  (function +16) == 0x81C08000 && \
+  *(int *)  (function +20) == 0xCA73A8BF
 #define tramp_address(function)  \
-  *(long *) (function +24)
+  *(long *) (function +32)
 #define tramp_data(function)  \
-  *(long *) (function +16)
+  *(long *) (function +24)
 #endif
 #ifdef __alpha__
   /* function: