Provide groundwork for 32-bit binary compatibility on non-x86 platforms,

for upcoming 64-bit PowerPC and MIPS support. This renames the COMPAT_IA32
option to COMPAT_FREEBSD32, removes some IA32-specific code from MI parts
of the kernel and enhances the freebsd32 compatibility code to support
big-endian platforms.

Reviewed by:	kib, jhb

7 files changed, 19 insertions, 8 deletions

diff --git a/sys/ia64/conf/GENERIC b/sys/ia64/conf/GENERIC
index b64c014..fed28bb 100644
--- a/sys/ia64/conf/GENERIC
+++ b/sys/ia64/conf/GENERIC
@@ -28,6 +28,7 @@ makeoptions	DEBUG=-g	# Build kernel with debug information.
 options 	AUDIT		# Security event auditing
 options 	CD9660		# ISO 9660 Filesystem
 options 	COMPAT_43TTY	# BSD 4.3 TTY compat (sgtty)
+options 	COMPAT_FREEBSD32	# Compatible with FreeBSD6
 options 	COMPAT_FREEBSD6	# Compatible with FreeBSD6
 options 	COMPAT_FREEBSD7	# Compatible with FreeBSD7
 options 	DDB		# Support DDB
diff --git a/sys/ia64/conf/NOTES b/sys/ia64/conf/NOTES
index 873199a..3f38218 100644
--- a/sys/ia64/conf/NOTES
+++ b/sys/ia64/conf/NOTES
@@ -12,10 +12,10 @@
 cpu		ITANIUM
 cpu		ITANIUM2
 
-# option: COMPAT_IA32
+# option: COMPAT_FREEBSD32
 # This option enables the support for execution of i386 (32-bit) programs on
 # ia64. It is based on the ia32 emulation in the processor.
-options 	COMPAT_IA32
+options 	COMPAT_FREEBSD32
 
 # option: LOG2_ID_PAGE_SIZE
 # Specify the log2 size of the identity (direct) mappings in regions 6 and 7
diff --git a/sys/ia64/ia64/exception.S b/sys/ia64/ia64/exception.S
index 3a4ac03..2868c8a 100644
--- a/sys/ia64/ia64/exception.S
+++ b/sys/ia64/ia64/exception.S
@@ -676,7 +676,7 @@ ivt_##name:					\
 #define	IVT_END(name)				\
 	.endp	ivt_##name
 
-#ifdef COMPAT_IA32
+#ifdef COMPAT_FREEBSD32
 #define	IA32_TRAP	ia32_trap
 #else
 #define	IA32_TRAP	trap
diff --git a/sys/ia64/ia64/genassym.c b/sys/ia64/ia64/genassym.c
index 9f76252..d81054b 100644
--- a/sys/ia64/ia64/genassym.c
+++ b/sys/ia64/ia64/genassym.c
@@ -61,8 +61,8 @@
 #include <net/if.h>
 #include <netinet/in.h>
 
-#ifdef COMPAT_IA32
-ASSYM(COMPAT_IA32,	COMPAT_IA32);
+#ifdef COMPAT_FREEBSD32
+ASSYM(COMPAT_FREEBSD32,	COMPAT_FREEBSD32);
 #endif
 
 ASSYM(DT_NULL,		DT_NULL);
diff --git a/sys/ia64/ia64/machdep.c b/sys/ia64/ia64/machdep.c
index cddf6c0..cb64f7f 100644
--- a/sys/ia64/ia64/machdep.c
+++ b/sys/ia64/ia64/machdep.c
@@ -443,7 +443,7 @@ cpu_switch(struct thread *old, struct thread *new, struct mtx *mtx)
 	struct pcb *oldpcb, *newpcb;
 
 	oldpcb = old->td_pcb;
-#ifdef COMPAT_IA32
+#ifdef COMPAT_FREEBSD32
 	ia32_savectx(oldpcb);
 #endif
 	if (PCPU_GET(fpcurthread) == old)
@@ -459,7 +459,7 @@ cpu_switch(struct thread *old, struct thread *new, struct mtx *mtx)
 		oldpcb->pcb_current_pmap =
 		    pmap_switch(newpcb->pcb_current_pmap);
 		PCPU_SET(curthread, new);
-#ifdef COMPAT_IA32
+#ifdef COMPAT_FREEBSD32
 		ia32_restorectx(newpcb);
 #endif
 		if (PCPU_GET(fpcurthread) == new)
@@ -479,7 +479,7 @@ cpu_throw(struct thread *old __unused, struct thread *new)
 	newpcb = new->td_pcb;
 	(void)pmap_switch(newpcb->pcb_current_pmap);
 	PCPU_SET(curthread, new);
-#ifdef COMPAT_IA32
+#ifdef COMPAT_FREEBSD32
 	ia32_restorectx(newpcb);
 #endif
 	restorectx(newpcb);
diff --git a/sys/ia64/include/elf.h b/sys/ia64/include/elf.h
index c6a43fc..27182db 100644
--- a/sys/ia64/include/elf.h
+++ b/sys/ia64/include/elf.h
@@ -43,6 +43,7 @@
 #include <sys/elf_generic.h>
 
 #define	ELF_ARCH	EM_IA_64
+#define	ELF_ARCH32	EM_386
 
 #define	ELF_MACHINE_OK(x) ((x) == EM_IA_64)
 
diff --git a/sys/ia64/include/reg.h b/sys/ia64/include/reg.h
index 453c9b8..e95db31 100644
--- a/sys/ia64/include/reg.h
+++ b/sys/ia64/include/reg.h
@@ -31,6 +31,10 @@
 
 #include <machine/_regset.h>
 
+#if defined(_KERNEL) && !defined(_STANDALONE)
+#include "opt_compat.h"
+#endif
+
 struct reg {
 	struct _special		r_special;
 	struct _callee_saved	r_preserved;
@@ -48,6 +52,11 @@ struct dbreg {
 	unsigned long	dbr_inst[8];
 };
 
+#ifdef COMPAT_FREEBSD32
+#include <machine/fpu.h>
+#include <compat/ia32/ia32_reg.h>
+#endif
+
 #ifdef _KERNEL
 struct thread;