From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/parisc/kernel/signal32.h | 91 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 arch/parisc/kernel/signal32.h

(limited to 'arch/parisc/kernel/signal32.h')

diff --git a/arch/parisc/kernel/signal32.h b/arch/parisc/kernel/signal32.h
new file mode 100644
index 000000000..af51d4cce
--- /dev/null
+++ b/arch/parisc/kernel/signal32.h
@@ -0,0 +1,91 @@
+/* 
+ *    Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
+ *    Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org>
+ *
+ *    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, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifndef _PARISC64_KERNEL_SIGNAL32_H
+#define _PARISC64_KERNEL_SIGNAL32_H
+
+#include <linux/compat.h>
+
+/* 32-bit ucontext as seen from an 64-bit kernel */
+struct compat_ucontext {
+        compat_uint_t uc_flags;
+        compat_uptr_t uc_link;
+        compat_stack_t uc_stack;        /* struct compat_sigaltstack (12 bytes)*/
+        /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
+        compat_uint_t pad[1];
+        struct compat_sigcontext uc_mcontext;
+        compat_sigset_t uc_sigmask;     /* mask last for extensibility */
+};
+
+/* ELF32 signal handling */
+
+int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from);
+int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
+
+/* In a deft move of uber-hackery, we decide to carry the top half of all
+ * 64-bit registers in a non-portable, non-ABI, hidden structure.
+ * Userspace can read the hidden structure if it *wants* but is never
+ * guaranteed to be in the same place. In fact the uc_sigmask from the
+ * ucontext_t structure may push the hidden register file downards
+ */
+struct compat_regfile {
+        /* Upper half of all the 64-bit registers that were truncated
+           on a copy to a 32-bit userspace */
+        compat_int_t rf_gr[32];
+        compat_int_t rf_iasq[2];
+        compat_int_t rf_iaoq[2];
+        compat_int_t rf_sar;
+};
+
+#define COMPAT_SIGRETURN_TRAMP 4
+#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
+#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
+				COMPAT_SIGRESTARTBLOCK_TRAMP)
+
+struct compat_rt_sigframe {
+        /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
+                Secondary to that it must protect the ERESTART_RESTARTBLOCK
+                trampoline we left on the stack (we were bad and didn't
+                change sp so we could run really fast.) */
+        compat_uint_t tramp[COMPAT_TRAMP_SIZE];
+        compat_siginfo_t info;
+        struct compat_ucontext uc;
+        /* Hidden location of truncated registers, *must* be last. */
+        struct compat_regfile regs;
+};
+
+/*
+ * The 32-bit ABI wants at least 48 bytes for a function call frame:
+ * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
+ * which Linux/parisc uses is sp-20 for the saved return pointer...)
+ * Then, the stack pointer must be rounded to a cache line (64 bytes).
+ */
+#define SIGFRAME32              64
+#define FUNCTIONCALLFRAME32     48
+#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
+
+void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
+void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
+long restore_sigcontext32(struct compat_sigcontext __user *sc, 
+		struct compat_regfile __user *rf,
+		struct pt_regs *regs);
+long setup_sigcontext32(struct compat_sigcontext __user *sc, 
+		struct compat_regfile __user *rf,
+		struct pt_regs *regs, int in_syscall);
+
+#endif
-- 
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