[src/trunk]: src/sys/arch/amd64 Save maxv@ some work and put back the compat_...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7e74b1dbb085
branches:  trunk
changeset: 828308:7e74b1dbb085
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Dec 07 23:11:50 2017 +0000

description:
Save maxv@ some work and put back the compat_13_sigreturn changes that allow
amd64 to run ancient i386 binaries.

diffstat:

 sys/arch/amd64/amd64/compat_13_machdep.c |  63 +++++++++++++++++++++++++++++
 sys/arch/amd64/amd64/netbsd32_machdep.c  |  68 +++++++++++++++++++++++++++++++-
 sys/arch/amd64/conf/files.amd64          |   3 +-
 3 files changed, 131 insertions(+), 3 deletions(-)

diffs (170 lines):

diff -r 442276661d95 -r 7e74b1dbb085 sys/arch/amd64/amd64/compat_13_machdep.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/amd64/amd64/compat_13_machdep.c  Thu Dec 07 23:11:50 2017 +0000
@@ -0,0 +1,63 @@
+/*     $NetBSD: compat_13_machdep.c,v 1.3 2017/12/07 23:11:50 christos Exp $   */
+
+/*-
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.3 2017/12/07 23:11:50 christos Exp $");
+
+#ifdef _KERNEL_OPT
+#include "opt_compat_netbsd.h"
+#endif
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/signalvar.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/syscallargs.h>
+
+#include <compat/sys/signal.h>
+#include <compat/sys/signalvar.h>
+
+#ifdef COMPAT_13
+
+int compat_13_sys_sigreturn(struct lwp *, const struct compat_13_sys_sigreturn_args *, register_t *);
+
+/*
+ * There is no NetBSD-1.6 compatibility for native code.
+ * COMPAT_13 is useful for i386 emulation (COMPAT_NETBSD32) only.
+ */
+int
+compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
+{
+
+       return ENOSYS;
+}
+#endif
diff -r 442276661d95 -r 7e74b1dbb085 sys/arch/amd64/amd64/netbsd32_machdep.c
--- a/sys/arch/amd64/amd64/netbsd32_machdep.c   Thu Dec 07 22:56:23 2017 +0000
+++ b/sys/arch/amd64/amd64/netbsd32_machdep.c   Thu Dec 07 23:11:50 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: netbsd32_machdep.c,v 1.114 2017/12/07 16:22:22 christos Exp $  */
+/*     $NetBSD: netbsd32_machdep.c,v 1.115 2017/12/07 23:11:50 christos Exp $  */
 
 /*
  * Copyright (c) 2001 Wasabi Systems, Inc.
@@ -36,7 +36,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: netbsd32_machdep.c,v 1.114 2017/12/07 16:22:22 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: netbsd32_machdep.c,v 1.115 2017/12/07 23:11:50 christos Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_compat_netbsd.h"
@@ -1114,3 +1114,67 @@
        else
                return VM_DEFAULT_ADDRESS32_BOTTOMUP(base, sz);
 }
+
+#ifdef COMPAT_13
+int
+compat_13_netbsd32_sigreturn(struct lwp *l, const struct compat_13_netbsd32_sigreturn_args *uap, register_t *retval)
+{
+       /* {
+               syscallarg(struct netbsd32_sigcontext13 *) sigcntxp;
+       } */
+       struct proc *p = l->l_proc;
+       struct netbsd32_sigcontext13 *scp, context;
+       struct trapframe *tf;
+       sigset_t mask;
+       int error;
+
+       /*
+        * The trampoline code hands us the context.
+        * It is unsafe to keep track of it ourselves, in the event that a
+        * program jumps out of a signal handler.
+        */
+       scp = (struct netbsd32_sigcontext13 *)NETBSD32PTR64(SCARG(uap, sigcntxp));
+       if (copyin((void *)scp, &context, sizeof(*scp)) != 0)
+               return (EFAULT);
+
+       /* Restore register context. */
+       tf = l->l_md.md_regs;
+
+       /*
+        * Check for security violations.
+        */
+       error = check_sigcontext32(l, (const struct netbsd32_sigcontext *)&context);
+       if (error != 0)
+               return error;
+
+       tf->tf_gs = context.sc_gs & 0xFFFF;
+       tf->tf_fs = context.sc_fs & 0xFFFF;             
+       tf->tf_es = context.sc_es & 0xFFFF;
+       tf->tf_ds = context.sc_ds & 0xFFFF;
+       tf->tf_rflags = context.sc_eflags;
+       tf->tf_rdi = context.sc_edi;
+       tf->tf_rsi = context.sc_esi;
+       tf->tf_rbp = context.sc_ebp;
+       tf->tf_rbx = context.sc_ebx;
+       tf->tf_rdx = context.sc_edx;
+       tf->tf_rcx = context.sc_ecx;
+       tf->tf_rax = context.sc_eax;
+       tf->tf_rip = context.sc_eip;
+       tf->tf_cs = context.sc_cs & 0xFFFF;
+       tf->tf_rsp = context.sc_esp;
+       tf->tf_ss = context.sc_ss & 0xFFFF;
+
+       mutex_enter(p->p_lock);
+       /* Restore signal stack. */
+       if (context.sc_onstack & SS_ONSTACK)
+               l->l_sigstk.ss_flags |= SS_ONSTACK;
+       else
+               l->l_sigstk.ss_flags &= ~SS_ONSTACK;
+       /* Restore signal mask. */
+       native_sigset13_to_sigset((sigset13_t *)&context.sc_mask, &mask);
+       (void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
+       mutex_exit(p->p_lock);
+
+       return (EJUSTRETURN);
+}
+#endif
diff -r 442276661d95 -r 7e74b1dbb085 sys/arch/amd64/conf/files.amd64
--- a/sys/arch/amd64/conf/files.amd64   Thu Dec 07 22:56:23 2017 +0000
+++ b/sys/arch/amd64/conf/files.amd64   Thu Dec 07 23:11:50 2017 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.amd64,v 1.95 2017/12/02 13:03:15 maxv Exp $
+#      $NetBSD: files.amd64,v 1.96 2017/12/07 23:11:50 christos Exp $
 #
 # new style config file for amd64 architecture
 #
@@ -136,6 +136,7 @@
 # Compatibility modules
 #
 # Binary compatibility with previous NetBSD releases (COMPAT_XX)
+file   arch/amd64/amd64/compat_13_machdep.c    compat_13
 file   arch/amd64/amd64/compat_16_machdep.c    compat_16
 
 # NetBSD/i386 32-bit binary compatibility (COMPAT_NETBSD32)