integrate 040 MDP_UNCACHE_WX cache changes by niklas & deraadt

diff --git a/sys/arch/mac68k/include/proc.h b/sys/arch/mac68k/include/proc.h
index c343f3a..7707df4 100644 (file)
--- a/sys/arch/mac68k/include/proc.h
+++ b/sys/arch/mac68k/include/proc.h
@@ -48,3 +48,5 @@ struct mdproc {
 #define        MDP_STACKADJ    0x0002  /* Frame SP adjusted, might have to
                                   undo when system call returns
                                   ERESTART. */
+#define        MDP_UNCACHE_WX  0x0004  /* The process might modify code, so
+                                  don't cache writeable executable pages.  */

diff --git a/sys/arch/mac68k/mac68k/machdep.c b/sys/arch/mac68k/mac68k/machdep.c
index 20f1b8e..d410a95 100644 (file)
--- a/sys/arch/mac68k/mac68k/machdep.c
+++ b/sys/arch/mac68k/mac68k/machdep.c
@@ -123,6 +123,11 @@
 
 #include <dev/cons.h>
 
+#ifdef COMPAT_SUNOS
+#include <compat/sunos/sunos_syscall.h>
+extern struct emul emul_sunos;
+#endif
+
 #include "via.h"
 #include "macrom.h"
 #include "ether.h"
@@ -478,6 +483,18 @@ setregs(p, pack, sp, retval)
        if (fpu_type) {
                m68881_restore(&p->p_addr->u_pcb.pcb_fpregs);
        }
+
+#ifdef COMPAT_SUNOS
+       /*
+        * SunOS' ld.so does self-modifying code without knowing
+        * about the 040's cache purging needs.  So we need to uncache
+        * writeable executable pages.
+        */
+       if (p->p_emul == &emul_sunos)
+               p->p_md.md_flags |= MDP_UNCACHE_WX;
+       else
+               p->p_md.md_flags &= ~MDP_UNCACHE_WX;
+#endif
 }
 
 #define SS_RTEFRAME    1

diff --git a/sys/arch/mac68k/mac68k/pmap.c b/sys/arch/mac68k/mac68k/pmap.c
index 8d504e6..d9f3b1c 100644 (file)
--- a/sys/arch/mac68k/mac68k/pmap.c
+++ b/sys/arch/mac68k/mac68k/pmap.c
@@ -1381,6 +1381,13 @@ validate:
        npte = pa | pte_prot(pmap, prot) | (*pte & (PG_M|PG_U)) | PG_V;
        if (wired)
                npte |= PG_W;
+
+       /* Don't cache if process can't take it, like SunOS ones.  */
+       if (mmutype == MMU_68040 && pmap != pmap_kernel() &&
+           (curproc->p_md.md_flags & MDP_UNCACHE_WX) &&
+           (prot & VM_PROT_EXECUTE) && (prot & VM_PROT_WRITE))
+               checkpv = cacheable = FALSE;
+
        if (!checkpv && !cacheable)
                npte |= PG_CI;
 #if defined(M68040)