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-rw-r--r--arch/mips/include/asm/ptrace.h189
1 files changed, 189 insertions, 0 deletions
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
new file mode 100644
index 000000000..daf3cf244
--- /dev/null
+++ b/arch/mips/include/asm/ptrace.h
@@ -0,0 +1,189 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_PTRACE_H
+#define _ASM_PTRACE_H
+
+
+#include <linux/compiler.h>
+#include <linux/linkage.h>
+#include <linux/types.h>
+#include <asm/isadep.h>
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <uapi/asm/ptrace.h>
+
+/*
+ * This struct defines the way the registers are stored on the stack during a
+ * system call/exception. As usual the registers k0/k1 aren't being saved.
+ *
+ * If you add a register here, also add it to regoffset_table[] in
+ * arch/mips/kernel/ptrace.c.
+ */
+struct pt_regs {
+#ifdef CONFIG_32BIT
+ /* Pad bytes for argument save space on the stack. */
+ unsigned long pad0[8];
+#endif
+
+ /* Saved main processor registers. */
+ unsigned long regs[32];
+
+ /* Saved special registers. */
+ unsigned long cp0_status;
+ unsigned long hi;
+ unsigned long lo;
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+ unsigned long acx;
+#endif
+ unsigned long cp0_badvaddr;
+ unsigned long cp0_cause;
+ unsigned long cp0_epc;
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ unsigned long long mpl[6]; /* MTM{0-5} */
+ unsigned long long mtp[6]; /* MTP{0-5} */
+#endif
+ unsigned long __last[0];
+} __aligned(8);
+
+static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
+{
+ return regs->regs[29];
+}
+
+static inline void instruction_pointer_set(struct pt_regs *regs,
+ unsigned long val)
+{
+ regs->cp0_epc = val;
+}
+
+/* Query offset/name of register from its name/offset */
+extern int regs_query_register_offset(const char *name);
+#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
+
+/**
+ * regs_get_register() - get register value from its offset
+ * @regs: pt_regs from which register value is gotten.
+ * @offset: offset number of the register.
+ *
+ * regs_get_register returns the value of a register. The @offset is the
+ * offset of the register in struct pt_regs address which specified by @regs.
+ * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
+ */
+static inline unsigned long regs_get_register(struct pt_regs *regs,
+ unsigned int offset)
+{
+ if (unlikely(offset > MAX_REG_OFFSET))
+ return 0;
+
+ return *(unsigned long *)((unsigned long)regs + offset);
+}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @addr: address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+static inline int regs_within_kernel_stack(struct pt_regs *regs,
+ unsigned long addr)
+{
+ return ((addr & ~(THREAD_SIZE - 1)) ==
+ (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @n: stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
+ unsigned int n)
+{
+ unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
+
+ addr += n;
+ if (regs_within_kernel_stack(regs, (unsigned long)addr))
+ return *addr;
+ else
+ return 0;
+}
+
+struct task_struct;
+
+extern int ptrace_getregs(struct task_struct *child,
+ struct user_pt_regs __user *data);
+extern int ptrace_setregs(struct task_struct *child,
+ struct user_pt_regs __user *data);
+
+extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
+extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
+
+extern int ptrace_get_watch_regs(struct task_struct *child,
+ struct pt_watch_regs __user *addr);
+extern int ptrace_set_watch_regs(struct task_struct *child,
+ struct pt_watch_regs __user *addr);
+
+/*
+ * Does the process account for user or for system time?
+ */
+#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
+
+static inline int is_syscall_success(struct pt_regs *regs)
+{
+ return !regs->regs[7];
+}
+
+static inline long regs_return_value(struct pt_regs *regs)
+{
+ if (is_syscall_success(regs) || !user_mode(regs))
+ return regs->regs[2];
+ else
+ return -regs->regs[2];
+}
+
+#define instruction_pointer(regs) ((regs)->cp0_epc)
+#define profile_pc(regs) instruction_pointer(regs)
+
+extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
+extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
+
+extern void die(const char *, struct pt_regs *) __noreturn;
+
+static inline void die_if_kernel(const char *str, struct pt_regs *regs)
+{
+ if (unlikely(!user_mode(regs)))
+ die(str, regs);
+}
+
+#define current_pt_regs() \
+({ \
+ unsigned long sp = (unsigned long)__builtin_frame_address(0); \
+ (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
+})
+
+/* Helpers for working with the user stack pointer */
+
+static inline unsigned long user_stack_pointer(struct pt_regs *regs)
+{
+ return regs->regs[29];
+}
+
+static inline void user_stack_pointer_set(struct pt_regs *regs,
+ unsigned long val)
+{
+ regs->regs[29] = val;
+}
+
+#endif /* _ASM_PTRACE_H */