1 files changed, 227 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
new file mode 100644
index 000000000..447cbd1be
--- /dev/null
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ *
+ * This struct defines the way the registers are stored on the
+ * kernel stack during a system call or other kernel entry.
+ *
+ * this should only contain volatile regs
+ * since we can keep non-volatile in the thread_struct
+ * should set this up when only volatiles are saved
+ * by intr code.
+ *
+ * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
+ * that the overall structure is a multiple of 16 bytes in length.
+ *
+ * Note that the offsets of the fields in this struct correspond with
+ * the PT_* values below.  This simplifies arch/powerpc/kernel/ptrace.c.
+ *
+ * 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.
+ */
+#ifndef _ASM_POWERPC_PTRACE_H
+#define _ASM_POWERPC_PTRACE_H
+
+#include <uapi/asm/ptrace.h>
+#include <asm/asm-const.h>
+
+
+#ifdef __powerpc64__
+
+/*
+ * Size of redzone that userspace is allowed to use below the stack
+ * pointer.  This is 288 in the 64-bit big-endian ELF ABI, and 512 in
+ * the new ELFv2 little-endian ABI, so we allow the larger amount.
+ *
+ * For kernel code we allow a 288-byte redzone, in order to conserve
+ * kernel stack space; gcc currently only uses 288 bytes, and will
+ * hopefully allow explicit control of the redzone size in future.
+ */
+#define USER_REDZONE_SIZE	512
+#define KERNEL_REDZONE_SIZE	288
+
+#define STACK_FRAME_OVERHEAD	112	/* size of minimum stack frame */
+#define STACK_FRAME_LR_SAVE	2	/* Location of LR in stack frame */
+#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x7265677368657265)
+#define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + \
+				 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
+#define STACK_FRAME_MARKER	12
+
+#ifdef PPC64_ELF_ABI_v2
+#define STACK_FRAME_MIN_SIZE	32
+#else
+#define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
+#endif
+
+/* Size of dummy stack frame allocated when calling signal handler. */
+#define __SIGNAL_FRAMESIZE	128
+#define __SIGNAL_FRAMESIZE32	64
+
+#else /* __powerpc64__ */
+
+#define USER_REDZONE_SIZE	0
+#define KERNEL_REDZONE_SIZE	0
+#define STACK_FRAME_OVERHEAD	16	/* size of minimum stack frame */
+#define STACK_FRAME_LR_SAVE	1	/* Location of LR in stack frame */
+#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x72656773)
+#define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
+#define STACK_FRAME_MARKER	2
+#define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
+
+/* Size of stack frame allocated when calling signal handler. */
+#define __SIGNAL_FRAMESIZE	64
+
+#endif /* __powerpc64__ */
+
+#ifndef __ASSEMBLY__
+
+#define GET_IP(regs)		((regs)->nip)
+#define GET_USP(regs)		((regs)->gpr[1])
+#define GET_FP(regs)		(0)
+#define SET_FP(regs, val)
+
+#ifdef CONFIG_SMP
+extern unsigned long profile_pc(struct pt_regs *regs);
+#define profile_pc profile_pc
+#endif
+
+#include <asm-generic/ptrace.h>
+
+#define kernel_stack_pointer(regs) ((regs)->gpr[1])
+static inline int is_syscall_success(struct pt_regs *regs)
+{
+	return !(regs->ccr & 0x10000000);
+}
+
+static inline long regs_return_value(struct pt_regs *regs)
+{
+	if (is_syscall_success(regs))
+		return regs->gpr[3];
+	else
+		return -regs->gpr[3];
+}
+
+#ifdef __powerpc64__
+#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
+#else
+#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
+#endif
+
+#define force_successful_syscall_return()   \
+	do { \
+		set_thread_flag(TIF_NOERROR); \
+	} while(0)
+
+struct task_struct;
+extern int ptrace_get_reg(struct task_struct *task, int regno,
+			  unsigned long *data);
+extern int ptrace_put_reg(struct task_struct *task, int regno,
+			  unsigned long data);
+
+#define current_pt_regs() \
+	((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
+/*
+ * We use the least-significant bit of the trap field to indicate
+ * whether we have saved the full set of registers, or only a
+ * partial set.  A 1 there means the partial set.
+ * On 4xx we use the next bit to indicate whether the exception
+ * is a critical exception (1 means it is).
+ */
+#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
+#ifndef __powerpc64__
+#define IS_CRITICAL_EXC(regs)	(((regs)->trap & 2) != 0)
+#define IS_MCHECK_EXC(regs)	(((regs)->trap & 4) != 0)
+#define IS_DEBUG_EXC(regs)	(((regs)->trap & 8) != 0)
+#endif /* ! __powerpc64__ */
+#define TRAP(regs)		((regs)->trap & ~0xF)
+#ifdef __powerpc64__
+#define NV_REG_POISON		0xdeadbeefdeadbeefUL
+#define CHECK_FULL_REGS(regs)	BUG_ON(regs->trap & 1)
+#else
+#define NV_REG_POISON		0xdeadbeef
+#define CHECK_FULL_REGS(regs)						      \
+do {									      \
+	if ((regs)->trap & 1)						      \
+		printk(KERN_CRIT "%s: partial register set\n", __func__); \
+} while (0)
+#endif /* __powerpc64__ */
+
+#define arch_has_single_step()	(1)
+#define arch_has_block_step()	(!cpu_has_feature(CPU_FTR_601))
+#define ARCH_HAS_USER_SINGLE_STEP_INFO
+
+/*
+ * kprobe-based event tracer support
+ */
+
+#include <linux/stddef.h>
+#include <linux/thread_info.h>
+extern int regs_query_register_offset(const char *name);
+extern const char *regs_query_register_name(unsigned int offset);
+#define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
+
+/**
+ * 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 whose offset from @regs.
+ * The @offset is the offset of the register in struct pt_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 bool 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;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#ifndef __powerpc64__
+#else /* __powerpc64__ */
+#define PT_FPSCR32 (PT_FPR0 + 2*32 + 1)	/* each FP reg occupies 2 32-bit userspace slots */
+#define PT_VR0_32 164	/* each Vector reg occupies 4 slots in 32-bit */
+#define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
+#define PT_VRSAVE_32 (PT_VR0 + 33*4)
+#define PT_VSR0_32 300 	/* each VSR reg occupies 4 slots in 32-bit */
+#endif /* __powerpc64__ */
+#endif /* _ASM_POWERPC_PTRACE_H */