1 files changed, 83 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/ptrace.h b/arch/alpha/include/asm/ptrace.h
new file mode 100644
index 000000000000..32c7a5cddd59
--- /dev/null
+++ b/arch/alpha/include/asm/ptrace.h
@@ -0,0 +1,83 @@
+#ifndef _ASMAXP_PTRACE_H
+#define _ASMAXP_PTRACE_H
+
+
+/*
+ * This struct defines the way the registers are stored on the
+ * kernel stack during a system call or other kernel entry
+ *
+ * NOTE! I want to minimize the overhead of system calls, so this
+ * struct has as little information as possible.  I does not have
+ *
+ *  - floating point regs: the kernel doesn't change those
+ *  - r9-15: saved by the C compiler
+ *
+ * This makes "fork()" and "exec()" a bit more complex, but should
+ * give us low system call latency.
+ */
+
+struct pt_regs {
+        unsigned long r0;
+        unsigned long r1;
+        unsigned long r2;
+        unsigned long r3;
+        unsigned long r4;
+        unsigned long r5;
+        unsigned long r6;
+        unsigned long r7;
+        unsigned long r8;
+        unsigned long r19;
+        unsigned long r20;
+        unsigned long r21;
+        unsigned long r22;
+        unsigned long r23;
+        unsigned long r24;
+        unsigned long r25;
+        unsigned long r26;
+        unsigned long r27;
+        unsigned long r28;
+        unsigned long hae;
+/* JRP - These are the values provided to a0-a2 by PALcode */
+        unsigned long trap_a0;
+        unsigned long trap_a1;
+        unsigned long trap_a2;
+/* These are saved by PAL-code: */
+        unsigned long ps;
+        unsigned long pc;
+        unsigned long gp;
+        unsigned long r16;
+        unsigned long r17;
+        unsigned long r18;
+};
+
+/*
+ * This is the extended stack used by signal handlers and the context
+ * switcher: it's pushed after the normal "struct pt_regs".
+ */
+struct switch_stack {
+        unsigned long r9;
+        unsigned long r10;
+        unsigned long r11;
+        unsigned long r12;
+        unsigned long r13;
+        unsigned long r14;
+        unsigned long r15;
+        unsigned long r26;
+        unsigned long fp[32];   /* fp[31] is fpcr */
+};
+
+#ifdef __KERNEL__
+
+#define user_mode(regs) (((regs)->ps & 8) != 0)
+#define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
+extern void show_regs(struct pt_regs *);
+
+#define task_pt_regs(task) \
+  ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
+
+#define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)
+
+#endif
+
+#endif