ARC: Fundamental ARCH data-types/defines
* L1_CACHE_SHIFT
* PAGE_SIZE, PAGE_OFFSET
* struct pt_regs, struct user_regs_struct
* struct thread_struct, cpu_relax(), task_pt_regs(), start_thread(), ...
* struct thread_info, THREAD_SIZE, INIT_THREAD_INFO(), TIF_*, ...
* BUG()
* ELF_*
* Elf_*
To disallow user-space visibility into some of the core kernel data-types
such as struct pt_regs, #ifdef __KERNEL__ which also makes the UAPI header
spit (further patch in the series) to NOT export it to asm/uapi/ptrace.h
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Jonas Bonn <jonas.bonn@gmail.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
new file mode 100644
index 0000000..446e55e
--- /dev/null
+++ b/arch/arc/include/asm/ptrace.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
+ */
+
+#ifndef __ASM_ARC_PTRACE_H
+#define __ASM_ARC_PTRACE_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+/* THE pt_regs: Defines how regs are saved during entry into kernel */
+
+struct pt_regs {
+ /*
+ * 1 word gutter after reg-file has been saved
+ * Technically not needed, Since SP always points to a "full" location
+ * (vs. "empty"). But pt_regs is shared with tools....
+ */
+ long res;
+
+ /* Real registers */
+ long bta; /* bta_l1, bta_l2, erbta */
+ long lp_start;
+ long lp_end;
+ long lp_count;
+ long status32; /* status32_l1, status32_l2, erstatus */
+ long ret; /* ilink1, ilink2 or eret */
+ long blink;
+ long fp;
+ long r26; /* gp */
+ long r12;
+ long r11;
+ long r10;
+ long r9;
+ long r8;
+ long r7;
+ long r6;
+ long r5;
+ long r4;
+ long r3;
+ long r2;
+ long r1;
+ long r0;
+ long sp; /* user/kernel sp depending on where we came from */
+ long orig_r0;
+ long orig_r8; /*to distinguish bet excp, sys call, int1 or int2 */
+};
+
+/* Callee saved registers - need to be saved only when you are scheduled out */
+
+struct callee_regs {
+ long res; /* Again this is not needed */
+ long r25;
+ long r24;
+ long r23;
+ long r22;
+ long r21;
+ long r20;
+ long r19;
+ long r18;
+ long r17;
+ long r16;
+ long r15;
+ long r14;
+ long r13;
+};
+
+#define instruction_pointer(regs) ((regs)->ret)
+#define profile_pc(regs) instruction_pointer(regs)
+
+/* return 1 if user mode or 0 if kernel mode */
+#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
+
+#define user_stack_pointer(regs)\
+({ unsigned int sp; \
+ if (user_mode(regs)) \
+ sp = (regs)->sp;\
+ else \
+ sp = -1; \
+ sp; \
+})
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#ifndef __ASSEMBLY__
+/*
+ * Userspace ABI: Register state needed by
+ * -ptrace (gdbserver)
+ * -sigcontext (SA_SIGNINFO signal frame)
+ *
+ * This is to decouple pt_regs from user-space ABI, to be able to change it
+ * w/o affecting the ABI.
+ * Although the layout (initial padding) is similar to pt_regs to have some
+ * optimizations when copying pt_regs to/from user_regs_struct.
+ *
+ * Also, sigcontext only care about the scratch regs as that is what we really
+ * save/restore for signal handling.
+*/
+struct user_regs_struct {
+
+ struct scratch {
+ long pad;
+ long bta, lp_start, lp_end, lp_count;
+ long status32, ret, blink, fp, gp;
+ long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
+ long sp;
+ } scratch;
+ struct callee {
+ long pad;
+ long r25, r24, r23, r22, r21, r20;
+ long r19, r18, r17, r16, r15, r14, r13;
+ } callee;
+ long efa; /* break pt addr, for break points in delay slots */
+ long stop_pc; /* give dbg stop_pc directly after checking orig_r8 */
+};
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __ASM_PTRACE_H */