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I think the attached patch is needed.. While I was there I noticed that
other emulations use

Index: pecoff_misc.c
===================================================================
RCS file: /cvsroot/src/sys/compat/pecoff/pecoff_misc.c,v
retrieving revision 1.11
diff -u -r1.11 pecoff_misc.c
--- pecoff_misc.c       19 Aug 2005 02:03:57 -0000      1.11
+++ pecoff_misc.c       20 Oct 2005 11:48:15 -0000
@@ -305,13 +305,18 @@
        void *v;
        register_t *retval;
 {
-       struct proc *p = l->l_proc;
        struct pecoff_sys_execve_args *uap = v;
+       struct proc *p = l->l_proc;
+       struct sys_execve_args ap;
        caddr_t sg = stackgap_init(p, 0);
 
        CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
 
-       return sys_execve(l, v, retval);
+       SCARG(&ap, path) = SCARG(uap, path);
+       SCARG(&ap, argp) = SCARG(uap, argp);
+       SCARG(&ap, envp) = SCARG(uap, envp);
+
+       return sys_execve(l, &ap, retval);
 }


Yet things seem to work without the above.

Cheers,

Patrick

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Index: syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/pecoff/syscalls.master,v
retrieving revision 1.12
diff -u -r1.12 syscalls.master
--- syscalls.master	19 Aug 2005 02:03:58 -0000	1.12
+++ syscalls.master	20 Oct 2005 14:31:19 -0000
@@ -629,7 +629,11 @@
 			    const sigset_t *set, \
 			    sigset_t *oset); }
 294	NOARGS		{ int sys___sigsuspend14(const sigset_t *set); }
+#ifdef COMPAT_16
 295	NOARGS		{ int compat_16_sys___sigreturn14(struct sigcontext *sigcntxp); }
+#else
+295	EXCL		compat_16_sys___sigreturn14
+#endif
 296	NOARGS		{ int sys___getcwd(char *bufp, size_t length); }
 297	NOARGS		{ int sys_fchroot(int fd); }
 298	NOARGS		{ int sys_fhopen(const fhandle_t *fhp, int flags); }

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