Use uintptr_t instead of register_t * for the stack base.

- Use ustringp for the location of the argv and environment strings
  and allow destp to travel further down the stack for the stackgap
  and auxv regions.
- Update the Linux copyout_strings variants to move destp down the
  stack as was done for the native ABIs in r263349.
- Stop allocating a space for a stack gap in the Linux ABIs.  This
  used to hold translated system call arguments, but hasn't been used
  since r159992.

Reviewed by:	kib
Tested on:	md64 (amd64, i386, linux64), i386 (i386, linux)
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D22501

1 files changed, 7 insertions, 5 deletions

diff --git a/sys/sys/sysent.h b/sys/sys/sysent.h
index cc3924ded7d8..9ed77fd09bea 100644
--- a/sys/sys/sysent.h
+++ b/sys/sys/sysent.h
@@ -99,7 +99,7 @@ struct sysentvec {
 	const int 	*sv_errtbl;	/* errno translation table */
 	int		(*sv_transtrap)(int, int);
 					/* translate trap-to-signal mapping */
-	int		(*sv_fixup)(register_t **, struct image_params *);
+	int		(*sv_fixup)(uintptr_t *, struct image_params *);
 					/* stack fixup function */
 	void		(*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
 			    		/* send signal */
@@ -109,17 +109,19 @@ struct sysentvec {
 	int		(*sv_coredump)(struct thread *, struct vnode *, off_t, int);
 					/* function to dump core, or NULL */
 	int		(*sv_imgact_try)(struct image_params *);
-	void		(*sv_stackgap)(struct image_params *, u_long *);
-	int		(*sv_copyout_auxargs)(struct image_params *, u_long *);
+	void		(*sv_stackgap)(struct image_params *, uintptr_t *);
+	int		(*sv_copyout_auxargs)(struct image_params *,
+			    uintptr_t *);
 	int		sv_minsigstksz;	/* minimum signal stack size */
 	vm_offset_t	sv_minuser;	/* VM_MIN_ADDRESS */
 	vm_offset_t	sv_maxuser;	/* VM_MAXUSER_ADDRESS */
 	vm_offset_t	sv_usrstack;	/* USRSTACK */
 	vm_offset_t	sv_psstrings;	/* PS_STRINGS */
 	int		sv_stackprot;	/* vm protection for stack */
-	int		(*sv_copyout_strings)(struct image_params *, register_t **);
+	int		(*sv_copyout_strings)(struct image_params *,
+			    uintptr_t *);
 	void		(*sv_setregs)(struct thread *, struct image_params *,
-			    u_long);
+			    uintptr_t);
 	void		(*sv_fixlimit)(struct rlimit *, int);
 	u_long		*sv_maxssiz;
 	u_int		sv_flags;