bsd-user: Move stack initializtion into a per-os file.

Move all of the stack initialization into target_os_stack.h. Each BSD
sets up processes a little differently.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/bsd-user/openbsd/target_os_stack.h b/bsd-user/openbsd/target_os_stack.h
new file mode 100644
index 0000000..4b37955
--- /dev/null
+++ b/bsd-user/openbsd/target_os_stack.h
@@ -0,0 +1,56 @@
+/*
+ *  OpenBSD setup_initial_stack() implementation.
+ *
+ *  Copyright (c) 2013-14 Stacey D. Son
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TARGET_OS_STACK_H_
+#define _TARGET_OS_STACK_H_
+
+#include "target_arch_sigtramp.h"
+
+static inline int setup_initial_stack(struct bsd_binprm *bprm, abi_ulong *p,
+    abi_ulong *stringp)
+{
+    int i;
+    abi_ulong stack_base;
+
+    stack_base = (target_stkbas + target_stksiz) -
+                  MAX_ARG_PAGES * TARGET_PAGE_SIZE;
+    if (p) {
+        *p = stack_base;
+    }
+    if (stringp) {
+        *stringp = stack_base;
+    }
+
+    for (i = 0; i < MAX_ARG_PAGES; i++) {
+        if (bprm->page[i]) {
+            info->rss++;
+            if (!memcpy_to_target(stack_base, bprm->page[i],
+                        TARGET_PAGE_SIZE)) {
+                errno = EFAULT;
+                return -1;
+            }
+            g_free(bprm->page[i]);
+        }
+        stack_base += TARGET_PAGE_SIZE;
+    }
+
+    return 0;
+}
+
+#endif /* !_TARGET_OS_STACK_H_ */