gem5: Add gem5 instrumentation
Export a set of symbols used for gem5 to determine sizes and locations
of useful data structures within the kernel.
Change-Id: Idcfaf5fcd91b7ea38e70f174af7f4d19c27a107e
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Geoffrey Blake <Geoffrey.Blake@arm.com>
[Ported to 4.14]
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
diff --git a/kernel/Makefile b/kernel/Makefile
index 172d151d..5adc027 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -13,6 +13,10 @@
async.o range.o smpboot.o ucount.o
obj-$(CONFIG_MODULES) += kmod.o
+
+# gem5 hooks for streamline support
+obj-y += m5struct.o
+
obj-$(CONFIG_MULTIUSER) += groups.o
ifdef CONFIG_FUNCTION_TRACER
diff --git a/kernel/m5struct.c b/kernel/m5struct.c
new file mode 100644
index 0000000..1b27384
--- /dev/null
+++ b/kernel/m5struct.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2005
+ * The Regents of The University of Michigan
+ * All Rights Reserved
+ *
+ * This code is part of the M5 simulator, developed by Nathan Binkert,
+ * Erik Hallnor, Steve Raasch, and Steve Reinhardt, with contributions
+ * from Ron Dreslinski, Dave Greene, Lisa Hsu, Kevin Lim, Ali Saidi,
+ * and Andrew Schultz.
+ *
+ * Permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any
+ * purpose, so long as the copyright notice above, this grant of
+ * permission, and the disclaimer below appear in all copies made; and
+ * so long as the name of The University of Michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization.
+ *
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
+ * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
+ * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
+ * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
+ * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGES.
+ */
+
+#include <stddef.h>
+#include <asm/page.h>
+#include <linux/dcache.h>
+#include <linux/fs.h>
+#include <linux/path.h>
+#include <linux/sched.h>
+#include <linux/mm_types.h>
+
+/*
+ * Structure size information
+ */
+const int thread_info_size = sizeof(struct thread_info);
+#ifndef CONFIG_THREAD_INFO_IN_TASK
+const int thread_info_task = offsetof(struct thread_info, task);
+#endif
+
+const int task_struct_size = sizeof(struct task_struct);
+const int task_struct_pid = offsetof(struct task_struct, pid);
+const int task_struct_start_time = offsetof(struct task_struct, start_time);
+const int task_struct_tgid = offsetof(struct task_struct, tgid);
+const int task_struct_comm = offsetof(struct task_struct, comm);
+const int task_struct_comm_size = TASK_COMM_LEN;
+const int task_struct_mm = offsetof(struct task_struct, mm);
+
+/*
+ * Virtual Memory structures
+ */
+const int mm_struct_size = sizeof(struct mm_struct);
+// mm_struct ptr
+const int mm_struct_mmap = offsetof(struct mm_struct, mmap);
+const int vm_area_struct_size = sizeof(struct vm_area_struct);
+const int vm_area_struct_vm_start = offsetof(struct vm_area_struct, vm_start);
+const int vm_area_struct_vm_end = offsetof(struct vm_area_struct, vm_end);
+const int vm_area_struct_vm_flags = offsetof(struct vm_area_struct, vm_flags);
+const int vm_area_struct_vm_pgoff = offsetof(struct vm_area_struct, vm_pgoff);
+const int vm_page_size = PAGE_SIZE;
+// vm_area_struct ptr
+const int vm_area_struct_vm_next = offsetof(struct vm_area_struct, vm_next);
+// file ptr
+const int vm_area_struct_vm_file = offsetof(struct vm_area_struct, vm_file);
+
+/*
+ * File structures
+ */
+const int file_struct_size = sizeof(struct file);
+// path ptr
+const int file_struct_f_path = offsetof(struct file, f_path);
+
+const int path_struct_size = sizeof(struct path);
+// dentry ptr
+const int path_struct_dentry = offsetof(struct path, dentry);
+
+const int dentry_struct_size = sizeof(struct dentry);
+// dentry ptr
+const int dentry_struct_d_parent = offsetof(struct dentry, d_parent);
+const int dentry_struct_d_name = offsetof(struct dentry, d_name);
+
+const int qstr_struct_size = sizeof(struct qstr);
+// char*
+const int qstr_struct_name = offsetof(struct qstr, name);
+const int qstr_struct_len = offsetof(struct qstr, len);
