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authorJonas Bonn <jonas@southpole.se>2011-06-04 22:45:16 +0300
committerJonas Bonn <jonas@southpole.se>2011-07-22 18:46:41 +0200
commit616257669e1aa28628e84914810d0d94a6967653 (patch)
tree05334dd9128e6554d2127156785c068433c25752 /arch/openrisc/kernel/asm-offsets.c
parent224cd129fdbb40a01de4aaf46cd77d80e65d81e5 (diff)
OpenRISC: Miscellaneous
Adds README file, TODO list, and a couple of other pieces that didn't seem to fit into any other patch. Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/openrisc/kernel/asm-offsets.c')
-rw-r--r--arch/openrisc/kernel/asm-offsets.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/asm-offsets.c b/arch/openrisc/kernel/asm-offsets.c
new file mode 100644
index 00000000000..1a242a0d758
--- /dev/null
+++ b/arch/openrisc/kernel/asm-offsets.c
@@ -0,0 +1,70 @@
+/*
+ * OpenRISC asm-offsets.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ * 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 used to generate definitions needed by
+ * assembly language modules.
+ *
+ * We use the technique used in the OSF Mach kernel code:
+ * generate asm statements containing #defines,
+ * compile this file to assembler, and then extract the
+ * #defines from the assembly-language output.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/thread_info.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+
+#define DEFINE(sym, val) \
+ asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define BLANK() asm volatile("\n->" : : )
+
+int main(void)
+{
+ /* offsets into the task_struct */
+ DEFINE(TASK_STATE, offsetof(struct task_struct, state));
+ DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
+ DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
+ DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
+ DEFINE(TASK_MM, offsetof(struct task_struct, mm));
+ DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
+
+ /* offsets into thread_info */
+ DEFINE(TI_TASK, offsetof(struct thread_info, task));
+ DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
+ DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
+ DEFINE(TI_KSP, offsetof(struct thread_info, ksp));
+
+ DEFINE(PT_SIZE, sizeof(struct pt_regs));
+
+ /* Interrupt register frame */
+ DEFINE(STACK_FRAME_OVERHEAD, STACK_FRAME_OVERHEAD);
+ DEFINE(INT_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs));
+
+ DEFINE(NUM_USER_SEGMENTS, TASK_SIZE >> 28);
+ return 0;
+}