diff --git a/sys/amd64/amd64/db_trace.c b/sys/amd64/amd64/db_trace.c
--- a/sys/amd64/amd64/db_trace.c
+++ b/sys/amd64/amd64/db_trace.c
@@ -31,6 +31,7 @@
 #include <sys/systm.h>
 #include <sys/kdb.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/smp.h>
 #include <sys/stack.h>
 #include <sys/sysent.h>
@@ -38,7 +39,6 @@
 #include <machine/cpu.h>
 #include <machine/md_var.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/stack.h>
 
 #include <vm/vm.h>
diff --git a/sys/amd64/amd64/gdb_machdep.c b/sys/amd64/amd64/gdb_machdep.c
--- a/sys/amd64/amd64/gdb_machdep.c
+++ b/sys/amd64/amd64/gdb_machdep.c
@@ -34,6 +34,7 @@
 #include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/signal.h>
 
 #include <machine/cpufunc.h>
@@ -42,7 +43,6 @@
 #include <machine/md_var.h>
 #include <machine/pcb.h>
 #include <machine/psl.h>
-#include <machine/reg.h>
 #include <machine/specialreg.h>
 #include <machine/trap.h>
 #include <machine/frame.h>
diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c
--- a/sys/amd64/amd64/machdep.c
+++ b/sys/amd64/amd64/machdep.c
@@ -83,6 +83,7 @@
 #include <sys/pcpu.h>
 #include <sys/ptrace.h>
 #include <sys/reboot.h>
+#include <sys/reg.h>
 #include <sys/rwlock.h>
 #include <sys/sched.h>
 #include <sys/signalvar.h>
@@ -129,7 +130,6 @@
 #include <machine/pc/bios.h>
 #include <machine/pcb.h>
 #include <machine/proc.h>
-#include <machine/reg.h>
 #include <machine/sigframe.h>
 #include <machine/specialreg.h>
 #include <machine/trap.h>
diff --git a/sys/amd64/ia32/ia32_reg.c b/sys/amd64/ia32/ia32_reg.c
--- a/sys/amd64/ia32/ia32_reg.c
+++ b/sys/amd64/ia32/ia32_reg.c
@@ -43,6 +43,7 @@
 #include <sys/namei.h>
 #include <sys/proc.h>
 #include <sys/procfs.h>
+#include <sys/reg.h>
 #include <sys/resourcevar.h>
 #include <sys/systm.h>
 #include <sys/signalvar.h>
diff --git a/sys/amd64/include/db_machdep.h b/sys/amd64/include/db_machdep.h
--- a/sys/amd64/include/db_machdep.h
+++ b/sys/amd64/include/db_machdep.h
@@ -30,7 +30,6 @@
 #define	_MACHINE_DB_MACHDEP_H_
 
 #include <machine/frame.h>
-#include <machine/reg.h>
 #include <machine/trap.h>
 
 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
diff --git a/sys/amd64/linux/linux_ptrace.c b/sys/amd64/linux/linux_ptrace.c
--- a/sys/amd64/linux/linux_ptrace.c
+++ b/sys/amd64/linux/linux_ptrace.c
@@ -40,7 +40,6 @@
 #include <sys/syscallsubr.h>
 
 #include <machine/pcb.h>
-#include <machine/reg.h>
 
 #include <amd64/linux/linux.h>
 #include <amd64/linux/linux_proto.h>
diff --git a/sys/amd64/linux32/linux32_machdep.c b/sys/amd64/linux32/linux32_machdep.c
--- a/sys/amd64/linux32/linux32_machdep.c
+++ b/sys/amd64/linux32/linux32_machdep.c
@@ -49,6 +49,7 @@
 #include <sys/mutex.h>
 #include <sys/priv.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/resource.h>
 #include <sys/resourcevar.h>
 #include <sys/syscallsubr.h>
@@ -61,7 +62,6 @@
 #include <machine/md_var.h>
 #include <machine/pcb.h>
 #include <machine/psl.h>
-#include <machine/reg.h>
 #include <machine/segments.h>
 #include <machine/specialreg.h>
 #include <x86/ifunc.h>
diff --git a/sys/amd64/vmm/amd/svm.c b/sys/amd64/vmm/amd/svm.c
--- a/sys/amd64/vmm/amd/svm.c
+++ b/sys/amd64/vmm/amd/svm.c
@@ -38,6 +38,7 @@
 #include <sys/malloc.h>
 #include <sys/pcpu.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/smr.h>
 #include <sys/sysctl.h>
 
@@ -47,7 +48,6 @@
 #include <machine/cpufunc.h>
 #include <machine/psl.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 #include <machine/specialreg.h>
 #include <machine/smp.h>
 #include <machine/vmm.h>
diff --git a/sys/amd64/vmm/intel/vmx.c b/sys/amd64/vmm/intel/vmx.c
--- a/sys/amd64/vmm/intel/vmx.c
+++ b/sys/amd64/vmm/intel/vmx.c
@@ -41,6 +41,7 @@
 #include <sys/malloc.h>
 #include <sys/pcpu.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/smr.h>
 #include <sys/sysctl.h>
 
@@ -50,7 +51,6 @@
 #include <machine/psl.h>
 #include <machine/cpufunc.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 #include <machine/segments.h>
 #include <machine/smp.h>
 #include <machine/specialreg.h>
diff --git a/sys/arm/arm/debug_monitor.c b/sys/arm/arm/debug_monitor.c
--- a/sys/arm/arm/debug_monitor.c
+++ b/sys/arm/arm/debug_monitor.c
@@ -35,6 +35,7 @@
 #include <sys/types.h>
 #include <sys/kdb.h>
 #include <sys/pcpu.h>
+#include <sys/reg.h>
 #include <sys/smp.h>
 #include <sys/systm.h>
 
@@ -44,7 +45,6 @@
 #include <machine/debug_monitor.h>
 #include <machine/kdb.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 
 #include <ddb/ddb.h>
 #include <ddb/db_access.h>
diff --git a/sys/arm/arm/machdep_kdb.c b/sys/arm/arm/machdep_kdb.c
--- a/sys/arm/arm/machdep_kdb.c
+++ b/sys/arm/arm/machdep_kdb.c
@@ -35,10 +35,10 @@
 
 #include <sys/param.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/systm.h>
 
 #include <machine/cpu.h>
-#include <machine/reg.h>
 
 #ifdef DDB
 #include <ddb/ddb.h>
diff --git a/sys/arm/include/reg.h b/sys/arm/include/reg.h
--- a/sys/arm/include/reg.h
+++ b/sys/arm/include/reg.h
@@ -30,13 +30,4 @@
 	unsigned int dbg_wvr[ARM_WR_MAX]; /* Watchpoint Value Registers */
 };
 
-#ifdef _KERNEL
-int     fill_regs(struct thread *, struct reg *);
-int     set_regs(struct thread *, struct reg *);
-int     fill_fpregs(struct thread *, struct fpreg *);
-int     set_fpregs(struct thread *, struct fpreg *);
-int     fill_dbregs(struct thread *, struct dbreg *);
-int     set_dbregs(struct thread *, struct dbreg *);
-#endif
-
 #endif /* !MACHINE_REG_H */
diff --git a/sys/arm64/arm64/machdep.c b/sys/arm64/arm64/machdep.c
--- a/sys/arm64/arm64/machdep.c
+++ b/sys/arm64/arm64/machdep.c
@@ -54,6 +54,7 @@
 #include <sys/proc.h>
 #include <sys/ptrace.h>
 #include <sys/reboot.h>
+#include <sys/reg.h>
 #include <sys/rwlock.h>
 #include <sys/sched.h>
 #include <sys/signalvar.h>
@@ -82,7 +83,6 @@
 #include <machine/metadata.h>
 #include <machine/md_var.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/undefined.h>
 #include <machine/vmparam.h>
 
diff --git a/sys/arm64/include/reg.h b/sys/arm64/include/reg.h
--- a/sys/arm64/include/reg.h
+++ b/sys/arm64/include/reg.h
@@ -83,24 +83,4 @@
 
 #define	__HAVE_REG32
 
-#ifdef _KERNEL
-/*
- * XXX these interfaces are MI, so they should be declared in a MI place.
- */
-int	fill_regs(struct thread *, struct reg *);
-int	set_regs(struct thread *, struct reg *);
-int	fill_fpregs(struct thread *, struct fpreg *);
-int	set_fpregs(struct thread *, struct fpreg *);
-int	fill_dbregs(struct thread *, struct dbreg *);
-int	set_dbregs(struct thread *, struct dbreg *);
-#ifdef COMPAT_FREEBSD32
-int	fill_regs32(struct thread *, struct reg32 *);
-int	set_regs32(struct thread *, struct reg32 *);
-int	fill_fpregs32(struct thread *, struct fpreg32 *);
-int	set_fpregs32(struct thread *, struct fpreg32 *);
-int	fill_dbregs32(struct thread *, struct dbreg32 *);
-int	set_dbregs32(struct thread *, struct dbreg32 *);
-#endif
-#endif
-
 #endif /* !_MACHINE_REG_H_ */
diff --git a/sys/arm64/linux/linux_machdep.c b/sys/arm64/linux/linux_machdep.c
--- a/sys/arm64/linux/linux_machdep.c
+++ b/sys/arm64/linux/linux_machdep.c
@@ -36,12 +36,11 @@
 #include <sys/imgact.h>
 #include <sys/ktr.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/sdt.h>
 
 #include <security/audit/audit.h>
 
-#include <machine/reg.h>
-
 #include <arm64/linux/linux.h>
 #include <arm64/linux/linux_proto.h>
 #include <compat/linux/linux_dtrace.h>
diff --git a/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c b/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c
--- a/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c
+++ b/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c
@@ -36,11 +36,11 @@
 #include <sys/types.h>
 #include <sys/dtrace_bsd.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/rmlock.h>
 #include <cddl/dev/dtrace/dtrace_cddl.h>
 #include <cddl/dev/dtrace/x86/regset.h>
 #include <machine/segments.h>
-#include <machine/reg.h>
 #include <machine/pcb.h>
 #include <machine/trap.h>
 #include <sys/sysmacros.h>
diff --git a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
@@ -35,7 +35,6 @@
 
 #include <machine/frame.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 
 #include <vm/vm.h>
 #include <vm/vm_param.h>
diff --git a/sys/cddl/dev/dtrace/amd64/dtrace_isa.c b/sys/cddl/dev/dtrace/amd64/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/amd64/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/amd64/dtrace_isa.c
@@ -35,7 +35,6 @@
 
 #include <machine/frame.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 #include <machine/stack.h>
 #include <x86/ifunc.h>
 
diff --git a/sys/cddl/dev/dtrace/arm/dtrace_isa.c b/sys/cddl/dev/dtrace/arm/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/arm/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/arm/dtrace_isa.c
@@ -35,7 +35,6 @@
 
 #include <machine/frame.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 
 #include <vm/vm.h>
 #include <vm/vm_param.h>
diff --git a/sys/cddl/dev/dtrace/mips/dtrace_isa.c b/sys/cddl/dev/dtrace/mips/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/mips/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/mips/dtrace_isa.c
@@ -35,7 +35,6 @@
 
 #include <machine/frame.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 
 #include <vm/vm.h>
 #include <vm/vm_param.h>
diff --git a/sys/cddl/dev/dtrace/powerpc/dtrace_isa.c b/sys/cddl/dev/dtrace/powerpc/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/powerpc/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/powerpc/dtrace_isa.c
@@ -39,7 +39,6 @@
 #include <machine/frame.h>
 #include <machine/md_var.h>
 #include <machine/psl.h>
-#include <machine/reg.h>
 #include <machine/stack.h>
 
 #include <vm/vm.h>
diff --git a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
@@ -37,7 +37,6 @@
 
 #include <machine/frame.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 
 #include <vm/vm.h>
 #include <vm/vm_param.h>
diff --git a/sys/compat/linux/linux_elf.c b/sys/compat/linux/linux_elf.c
--- a/sys/compat/linux/linux_elf.c
+++ b/sys/compat/linux/linux_elf.c
@@ -49,6 +49,7 @@
 #include <sys/proc.h>
 #include <sys/procfs.h>
 #include <sys/ptrace.h>
+#include <sys/reg.h>
 #include <sys/sbuf.h>
 #include <sys/sysent.h>
 #include <sys/user.h>
diff --git a/sys/ddb/db_run.c b/sys/ddb/db_run.c
--- a/sys/ddb/db_run.c
+++ b/sys/ddb/db_run.c
@@ -40,6 +40,7 @@
 #include <sys/param.h>
 #include <sys/kdb.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/systm.h>
 
 #include <machine/kdb.h>
diff --git a/sys/fs/procfs/procfs_dbregs.c b/sys/fs/procfs/procfs_dbregs.c
--- a/sys/fs/procfs/procfs_dbregs.c
+++ b/sys/fs/procfs/procfs_dbregs.c
@@ -54,8 +54,6 @@
 #include <sys/sysent.h>
 #include <sys/uio.h>
 
-#include <machine/reg.h>
-
 #include <fs/pseudofs/pseudofs.h>
 #include <fs/procfs/procfs.h>
 
diff --git a/sys/fs/procfs/procfs_fpregs.c b/sys/fs/procfs/procfs_fpregs.c
--- a/sys/fs/procfs/procfs_fpregs.c
+++ b/sys/fs/procfs/procfs_fpregs.c
@@ -48,8 +48,6 @@
 #include <sys/sysent.h>
 #include <sys/uio.h>
 
-#include <machine/reg.h>
-
 #include <fs/pseudofs/pseudofs.h>
 #include <fs/procfs/procfs.h>
 
diff --git a/sys/fs/procfs/procfs_regs.c b/sys/fs/procfs/procfs_regs.c
--- a/sys/fs/procfs/procfs_regs.c
+++ b/sys/fs/procfs/procfs_regs.c
@@ -48,8 +48,6 @@
 #include <sys/sysent.h>
 #include <sys/uio.h>
 
-#include <machine/reg.h>
-
 #include <fs/pseudofs/pseudofs.h>
 #include <fs/procfs/procfs.h>
 
diff --git a/sys/i386/i386/db_trace.c b/sys/i386/i386/db_trace.c
--- a/sys/i386/i386/db_trace.c
+++ b/sys/i386/i386/db_trace.c
@@ -31,13 +31,13 @@
 #include <sys/systm.h>
 #include <sys/kdb.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/sysent.h>
 
 #include <machine/cpu.h>
 #include <machine/frame.h>
 #include <machine/md_var.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/stack.h>
 
 #include <vm/vm.h>
diff --git a/sys/i386/i386/gdb_machdep.c b/sys/i386/i386/gdb_machdep.c
--- a/sys/i386/i386/gdb_machdep.c
+++ b/sys/i386/i386/gdb_machdep.c
@@ -34,13 +34,13 @@
 #include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/signal.h>
 
 #include <machine/endian.h>
 #include <machine/frame.h>
 #include <machine/gdb_machdep.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/trap.h>
 
 #include <gdb/gdb.h>
diff --git a/sys/i386/i386/machdep.c b/sys/i386/i386/machdep.c
--- a/sys/i386/i386/machdep.c
+++ b/sys/i386/i386/machdep.c
@@ -82,6 +82,7 @@
 #include <sys/pcpu.h>
 #include <sys/ptrace.h>
 #include <sys/reboot.h>
+#include <sys/reg.h>
 #include <sys/rwlock.h>
 #include <sys/sched.h>
 #include <sys/signalvar.h>
@@ -129,7 +130,6 @@
 #include <machine/pcb.h>
 #include <machine/pcb_ext.h>
 #include <machine/proc.h>
-#include <machine/reg.h>
 #include <machine/sigframe.h>
 #include <machine/specialreg.h>
 #include <machine/sysarch.h>
diff --git a/sys/i386/include/db_machdep.h b/sys/i386/include/db_machdep.h
--- a/sys/i386/include/db_machdep.h
+++ b/sys/i386/include/db_machdep.h
@@ -30,7 +30,6 @@
 #define	_MACHINE_DB_MACHDEP_H_
 
 #include <machine/frame.h>
-#include <machine/reg.h>
 #include <machine/trap.h>
 
 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
diff --git a/sys/i386/linux/linux_ptrace.c b/sys/i386/linux/linux_ptrace.c
--- a/sys/i386/linux/linux_ptrace.c
+++ b/sys/i386/linux/linux_ptrace.c
@@ -41,7 +41,6 @@
 
 #include <machine/md_var.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 
 #include <i386/linux/linux.h>
 #include <i386/linux/linux_proto.h>
diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
--- a/sys/kern/imgact_elf.c
+++ b/sys/kern/imgact_elf.c
@@ -54,6 +54,7 @@
 #include <sys/procfs.h>
 #include <sys/ptrace.h>
 #include <sys/racct.h>
+#include <sys/reg.h>
 #include <sys/resourcevar.h>
 #include <sys/rwlock.h>
 #include <sys/sbuf.h>
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -56,6 +56,7 @@
 #include <sys/priv.h>
 #include <sys/proc.h>
 #include <sys/ptrace.h>
+#include <sys/reg.h>
 #include <sys/resourcevar.h>
 #include <sys/rwlock.h>
 #include <sys/sched.h>
@@ -91,8 +92,6 @@
 #include <sys/pmckern.h>
 #endif
 
-#include <machine/reg.h>
-
 #include <security/audit/audit.h>
 #include <security/mac/mac_framework.h>
 
diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -40,6 +40,7 @@
 #include <sys/limits.h>
 #include <sys/lock.h>
 #include <sys/mutex.h>
+#include <sys/reg.h>
 #include <sys/syscallsubr.h>
 #include <sys/sysent.h>
 #include <sys/sysproto.h>
@@ -54,8 +55,6 @@
 #include <sys/caprights.h>
 #include <sys/filedesc.h>
 
-#include <machine/reg.h>
-
 #include <security/audit/audit.h>
 
 #include <vm/vm.h>
diff --git a/sys/mips/include/md_var.h b/sys/mips/include/md_var.h
--- a/sys/mips/include/md_var.h
+++ b/sys/mips/include/md_var.h
@@ -36,7 +36,7 @@
 #ifndef _MACHINE_MD_VAR_H_
 #define	_MACHINE_MD_VAR_H_
 
-#include <machine/reg.h>
+#include <machine/regnum.h>
 
 /*
  * Miscellaneous machine-dependent declarations.
diff --git a/sys/mips/include/reg.h b/sys/mips/include/reg.h
--- a/sys/mips/include/reg.h
+++ b/sys/mips/include/reg.h
@@ -85,23 +85,7 @@
 #define __HAVE_REG32
 #endif
 
-#ifdef _KERNEL
-int	fill_fpregs(struct thread *, struct fpreg *);
-int	fill_regs(struct thread *, struct reg *);
-int	set_fpregs(struct thread *, struct fpreg *);
-int	set_regs(struct thread *, struct reg *);
-int	fill_dbregs(struct thread *, struct dbreg *);
-int	set_dbregs(struct thread *, struct dbreg *);
-#endif
-
 #ifdef COMPAT_FREEBSD32
-struct image_params;
-
-int	fill_regs32(struct thread *, struct reg32 *);
-int	set_regs32(struct thread *, struct reg32 *);
-int	fill_fpregs32(struct thread *, struct fpreg32 *);
-int	set_fpregs32(struct thread *, struct fpreg32 *);
-
 #define	fill_dbregs32(td, reg)	0
 #define	set_dbregs32(td, reg)	0
 #endif
diff --git a/sys/mips/mips/freebsd32_machdep.c b/sys/mips/mips/freebsd32_machdep.c
--- a/sys/mips/mips/freebsd32_machdep.c
+++ b/sys/mips/mips/freebsd32_machdep.c
@@ -48,6 +48,7 @@
 #include <sys/fcntl.h>
 #include <sys/sysent.h>
 #include <sys/imgact_elf.h>
+#include <sys/reg.h>
 #include <sys/syscall.h>
 #include <sys/syscallsubr.h>
 #include <sys/sysproto.h>
@@ -60,7 +61,6 @@
 
 #include <machine/cpuinfo.h>
 #include <machine/md_var.h>
-#include <machine/reg.h>
 #include <machine/sigframe.h>
 #include <machine/sysarch.h>
 #include <machine/tls.h>
diff --git a/sys/mips/mips/gdb_machdep.c b/sys/mips/mips/gdb_machdep.c
--- a/sys/mips/mips/gdb_machdep.c
+++ b/sys/mips/mips/gdb_machdep.c
@@ -101,7 +101,6 @@
 
 #include <machine/gdb_machdep.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/trap.h>
 
 #include <gdb/gdb.h>
diff --git a/sys/mips/mips/machdep.c b/sys/mips/mips/machdep.c
--- a/sys/mips/mips/machdep.c
+++ b/sys/mips/mips/machdep.c
@@ -60,6 +60,7 @@
 #include <sys/mbuf.h>
 #include <sys/msgbuf.h>
 #include <sys/reboot.h>
+#include <sys/reg.h>
 #include <sys/rwlock.h>
 #include <sys/sched.h>
 #include <sys/sysctl.h>
diff --git a/sys/mips/mips/pm_machdep.c b/sys/mips/mips/pm_machdep.c
--- a/sys/mips/mips/pm_machdep.c
+++ b/sys/mips/mips/pm_machdep.c
@@ -44,6 +44,7 @@
 #include <sys/systm.h>
 #include <sys/sysent.h>
 #include <sys/proc.h>
+#include <sys/reg.h>
 #include <sys/signalvar.h>
 #include <sys/exec.h>
 #include <sys/ktr.h>
@@ -62,7 +63,6 @@
 #include <sys/uio.h>
 #include <machine/abi.h>
 #include <machine/cpuinfo.h>
-#include <machine/reg.h>
 #include <machine/md_var.h>
 #include <machine/sigframe.h>
 #include <machine/tls.h>
diff --git a/sys/mips/nlm/cms.c b/sys/mips/nlm/cms.c
--- a/sys/mips/nlm/cms.c
+++ b/sys/mips/nlm/cms.c
@@ -51,7 +51,6 @@
 #include <sys/sysctl.h>
 #include <sys/malloc.h>
 
-#include <machine/reg.h>
 #include <machine/cpu.h>
 #include <machine/hwfunc.h>
 #include <machine/mips_opcode.h>
diff --git a/sys/mips/nlm/dev/net/xlpge.c b/sys/mips/nlm/dev/net/xlpge.c
--- a/sys/mips/nlm/dev/net/xlpge.c
+++ b/sys/mips/nlm/dev/net/xlpge.c
@@ -69,7 +69,6 @@
 #include <vm/pmap.h>
 #include <vm/uma.h>
 
-#include <machine/reg.h>
 #include <machine/cpu.h>
 #include <machine/mips_opcode.h>
 #include <machine/asm.h>
diff --git a/sys/powerpc/aim/aim_machdep.c b/sys/powerpc/aim/aim_machdep.c
--- a/sys/powerpc/aim/aim_machdep.c
+++ b/sys/powerpc/aim/aim_machdep.c
@@ -118,7 +118,6 @@
 #include <machine/metadata.h>
 #include <machine/mmuvar.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/sigframe.h>
 #include <machine/spr.h>
 #include <machine/trap.h>
diff --git a/sys/powerpc/booke/booke_machdep.c b/sys/powerpc/booke/booke_machdep.c
--- a/sys/powerpc/booke/booke_machdep.c
+++ b/sys/powerpc/booke/booke_machdep.c
@@ -122,7 +122,6 @@
 
 #include <machine/cpu.h>
 #include <machine/kdb.h>
-#include <machine/reg.h>
 #include <machine/vmparam.h>
 #include <machine/spr.h>
 #include <machine/hid.h>
diff --git a/sys/powerpc/fpu/fpu_add.c b/sys/powerpc/fpu/fpu_add.c
--- a/sys/powerpc/fpu/fpu_add.c
+++ b/sys/powerpc/fpu/fpu_add.c
@@ -56,7 +56,6 @@
 
 #include <machine/fpu.h>
 #include <machine/ieeefp.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/fpu/fpu_compare.c b/sys/powerpc/fpu/fpu_compare.c
--- a/sys/powerpc/fpu/fpu_compare.c
+++ b/sys/powerpc/fpu/fpu_compare.c
@@ -56,7 +56,6 @@
 #include <sys/systm.h>
 
 #include <machine/fpu.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/fpu/fpu_div.c b/sys/powerpc/fpu/fpu_div.c
--- a/sys/powerpc/fpu/fpu_div.c
+++ b/sys/powerpc/fpu/fpu_div.c
@@ -53,7 +53,6 @@
 #include <sys/systm.h>
 
 #include <machine/fpu.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/fpu/fpu_emu.c b/sys/powerpc/fpu/fpu_emu.c
--- a/sys/powerpc/fpu/fpu_emu.c
+++ b/sys/powerpc/fpu/fpu_emu.c
@@ -93,7 +93,6 @@
 #include <sys/signalvar.h>
 
 #include <machine/fpu.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_emu.h>
 #include <powerpc/fpu/fpu_extern.h>
diff --git a/sys/powerpc/fpu/fpu_implode.c b/sys/powerpc/fpu/fpu_implode.c
--- a/sys/powerpc/fpu/fpu_implode.c
+++ b/sys/powerpc/fpu/fpu_implode.c
@@ -56,7 +56,6 @@
 #include <machine/fpu.h>
 #include <machine/ieee.h>
 #include <machine/ieeefp.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/fpu/fpu_mul.c b/sys/powerpc/fpu/fpu_mul.c
--- a/sys/powerpc/fpu/fpu_mul.c
+++ b/sys/powerpc/fpu/fpu_mul.c
@@ -53,7 +53,6 @@
 #include <sys/systm.h>
 
 #include <machine/fpu.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/fpu/fpu_sqrt.c b/sys/powerpc/fpu/fpu_sqrt.c
--- a/sys/powerpc/fpu/fpu_sqrt.c
+++ b/sys/powerpc/fpu/fpu_sqrt.c
@@ -53,7 +53,6 @@
 #include <sys/systm.h>
 
 #include <machine/fpu.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/fpu/fpu_subr.c b/sys/powerpc/fpu/fpu_subr.c
--- a/sys/powerpc/fpu/fpu_subr.c
+++ b/sys/powerpc/fpu/fpu_subr.c
@@ -53,7 +53,6 @@
 #include <sys/systm.h>
 
 #include <machine/fpu.h>
-#include <machine/reg.h>
 
 #include <powerpc/fpu/fpu_arith.h>
 #include <powerpc/fpu/fpu_emu.h>
diff --git a/sys/powerpc/powerpc/elf32_machdep.c b/sys/powerpc/powerpc/elf32_machdep.c
--- a/sys/powerpc/powerpc/elf32_machdep.c
+++ b/sys/powerpc/powerpc/elf32_machdep.c
@@ -42,6 +42,7 @@
 #include <sys/sysent.h>
 #include <sys/imgact_elf.h>
 #include <sys/jail.h>
+#include <sys/reg.h>
 #include <sys/smp.h>
 #include <sys/syscall.h>
 #include <sys/sysctl.h>
@@ -56,7 +57,6 @@
 #include <machine/cpu.h>
 #include <machine/fpu.h>
 #include <machine/elf.h>
-#include <machine/reg.h>
 #include <machine/md_var.h>
 
 #include <powerpc/powerpc/elf_common.c>
diff --git a/sys/powerpc/powerpc/exec_machdep.c b/sys/powerpc/powerpc/exec_machdep.c
--- a/sys/powerpc/powerpc/exec_machdep.c
+++ b/sys/powerpc/powerpc/exec_machdep.c
@@ -76,6 +76,7 @@
 #include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/mutex.h>
+#include <sys/reg.h>
 #include <sys/signalvar.h>
 #include <sys/syscallsubr.h>
 #include <sys/syscall.h>
@@ -89,7 +90,6 @@
 #include <machine/elf.h>
 #include <machine/fpu.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/sigframe.h>
 #include <machine/trap.h>
 #include <machine/vmparam.h>
diff --git a/sys/powerpc/powerpc/gdb_machdep.c b/sys/powerpc/powerpc/gdb_machdep.c
--- a/sys/powerpc/powerpc/gdb_machdep.c
+++ b/sys/powerpc/powerpc/gdb_machdep.c
@@ -38,7 +38,6 @@
 
 #include <machine/gdb_machdep.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 
 #include <machine/hid.h>
 #include <machine/spr.h>
diff --git a/sys/powerpc/powerpc/machdep.c b/sys/powerpc/powerpc/machdep.c
--- a/sys/powerpc/powerpc/machdep.c
+++ b/sys/powerpc/powerpc/machdep.c
@@ -83,6 +83,7 @@
 #include <sys/mutex.h>
 #include <sys/ptrace.h>
 #include <sys/reboot.h>
+#include <sys/reg.h>
 #include <sys/rwlock.h>
 #include <sys/signalvar.h>
 #include <sys/syscallsubr.h>
@@ -119,7 +120,6 @@
 #include <machine/metadata.h>
 #include <machine/mmuvar.h>
 #include <machine/pcb.h>
-#include <machine/reg.h>
 #include <machine/sigframe.h>
 #include <machine/spr.h>
 #include <machine/trap.h>
diff --git a/sys/riscv/include/reg.h b/sys/riscv/include/reg.h
--- a/sys/riscv/include/reg.h
+++ b/sys/riscv/include/reg.h
@@ -58,16 +58,4 @@
 	int dummy;
 };
 
-#ifdef _KERNEL
-/*
- * XXX these interfaces are MI, so they should be declared in a MI place.
- */
-int	fill_regs(struct thread *, struct reg *);
-int	set_regs(struct thread *, struct reg *);
-int	fill_fpregs(struct thread *, struct fpreg *);
-int	set_fpregs(struct thread *, struct fpreg *);
-int	fill_dbregs(struct thread *, struct dbreg *);
-int	set_dbregs(struct thread *, struct dbreg *);
-#endif
-
 #endif /* !_MACHINE_REG_H_ */
diff --git a/sys/riscv/riscv/machdep.c b/sys/riscv/riscv/machdep.c
--- a/sys/riscv/riscv/machdep.c
+++ b/sys/riscv/riscv/machdep.c
@@ -59,6 +59,7 @@
 #include <sys/proc.h>
 #include <sys/ptrace.h>
 #include <sys/reboot.h>
+#include <sys/reg.h>
 #include <sys/rwlock.h>
 #include <sys/sched.h>
 #include <sys/signalvar.h>
@@ -86,7 +87,6 @@
 #include <machine/metadata.h>
 #include <machine/pcb.h>
 #include <machine/pte.h>
-#include <machine/reg.h>
 #include <machine/riscvreg.h>
 #include <machine/sbi.h>
 #include <machine/trap.h>
diff --git a/sys/arm64/include/reg.h b/sys/sys/reg.h
copy from sys/arm64/include/reg.h
copy to sys/sys/reg.h
--- a/sys/arm64/include/reg.h
+++ b/sys/sys/reg.h
@@ -1,11 +1,16 @@
 /*-
- * Copyright (c) 2014 Andrew Turner
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (C) 2014,2019 Andrew Turner
  * Copyright (c) 2014-2015 The FreeBSD Foundation
- * All rights reserved.
  *
  * This software was developed by Andrew Turner under
  * sponsorship from the FreeBSD Foundation.
  *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -30,63 +35,12 @@
  * $FreeBSD$
  */
 
-#ifndef	_MACHINE_REG_H_
-#define	_MACHINE_REG_H_
-
-struct reg {
-	uint64_t x[30];
-	uint64_t lr;
-	uint64_t sp;
-	uint64_t elr;
-	uint32_t spsr;
-};
-
-struct reg32 {
-	unsigned int r[13];
-	unsigned int r_sp;
-	unsigned int r_lr;
-	unsigned int r_pc;
-	unsigned int r_cpsr;
-};
-
-struct fpreg {
-	__uint128_t	fp_q[32];
-	uint32_t	fp_sr;
-	uint32_t	fp_cr;
-};
-
-struct fpreg32 {
-	int dummy;
-};
-
-struct dbreg {
-	uint8_t		db_debug_ver;
-	uint8_t		db_nbkpts;
-	uint8_t		db_nwtpts;
-	uint8_t		db_pad[5];
-
-	struct {
-		uint64_t dbr_addr;
-		uint32_t dbr_ctrl;
-		uint32_t dbr_pad;
-	} db_breakregs[16];
-	struct {
-		uint64_t dbw_addr;
-		uint32_t dbw_ctrl;
-		uint32_t dbw_pad;
-	} db_watchregs[16];
-};
+#ifndef	_SYS_REG_H_
+#define	_SYS_REG_H_
 
-struct dbreg32 {
-	int dummy;
-};
-
-#define	__HAVE_REG32
+#include <machine/reg.h>
 
 #ifdef _KERNEL
-/*
- * XXX these interfaces are MI, so they should be declared in a MI place.
- */
 int	fill_regs(struct thread *, struct reg *);
 int	set_regs(struct thread *, struct reg *);
 int	fill_fpregs(struct thread *, struct fpreg *);
@@ -96,11 +50,19 @@
 #ifdef COMPAT_FREEBSD32
 int	fill_regs32(struct thread *, struct reg32 *);
 int	set_regs32(struct thread *, struct reg32 *);
+#ifndef fill_fpregs32
 int	fill_fpregs32(struct thread *, struct fpreg32 *);
+#endif
+#ifndef set_fpregs32
 int	set_fpregs32(struct thread *, struct fpreg32 *);
+#endif
+#ifndef fill_dbregs32
 int	fill_dbregs32(struct thread *, struct dbreg32 *);
+#endif
+#ifndef set_dbregs32
 int	set_dbregs32(struct thread *, struct dbreg32 *);
 #endif
 #endif
+#endif
 
-#endif /* !_MACHINE_REG_H_ */
+#endif
diff --git a/sys/x86/include/reg.h b/sys/x86/include/reg.h
--- a/sys/x86/include/reg.h
+++ b/sys/x86/include/reg.h
@@ -244,26 +244,10 @@
 #undef __dbreg64
 
 #ifdef _KERNEL
-struct thread;
-
 /*
  * XXX these interfaces are MI, so they should be declared in a MI place.
  */
-int	fill_regs(struct thread *, struct reg *);
 int	fill_frame_regs(struct trapframe *, struct reg *);
-int	set_regs(struct thread *, struct reg *);
-int	fill_fpregs(struct thread *, struct fpreg *);
-int	set_fpregs(struct thread *, struct fpreg *);
-int	fill_dbregs(struct thread *, struct dbreg *);
-int	set_dbregs(struct thread *, struct dbreg *);
-#ifdef COMPAT_FREEBSD32
-int	fill_regs32(struct thread *, struct reg32 *);
-int	set_regs32(struct thread *, struct reg32 *);
-int	fill_fpregs32(struct thread *, struct fpreg32 *);
-int	set_fpregs32(struct thread *, struct fpreg32 *);
-int	fill_dbregs32(struct thread *, struct dbreg32 *);
-int	set_dbregs32(struct thread *, struct dbreg32 *);
-#endif
 #endif
 
 #endif /* !_MACHINE_REG_H_ */
diff --git a/sys/x86/x86/dbreg.c b/sys/x86/x86/dbreg.c
--- a/sys/x86/x86/dbreg.c
+++ b/sys/x86/x86/dbreg.c
@@ -29,6 +29,7 @@
 #include <sys/types.h>
 #include <sys/kdb.h>
 #include <sys/pcpu.h>
+#include <sys/reg.h>
 #include <sys/smp.h>
 #include <sys/systm.h>