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Merge up to 2.6.20-rc4
Merge of 2.6.x-xfs-melb:linux:27915c by kenmcd.

#ifndef _I386_PTRACE_H
#define _I386_PTRACE_H

#include <asm/ptrace-abi.h>

/* this struct defines the way the registers are stored on the 
   stack during a system call. */

struct pt_regs {
	long ebx;
	long ecx;
	long edx;
	long esi;
	long edi;
	long ebp;
	long eax;
	int  xds;
	int  xes;
	/* int  xfs; */
	int  xgs;
	long orig_eax;
	long eip;
	int  xcs;
	long eflags;
	long esp;
	int  xss;
};

enum EFLAGS {
        EF_CF   = 0x00000001,
        EF_PF   = 0x00000004,
        EF_AF   = 0x00000010,
        EF_ZF   = 0x00000040,
        EF_SF   = 0x00000080,
        EF_TF   = 0x00000100,
        EF_IE   = 0x00000200,
        EF_DF   = 0x00000400,
        EF_OF   = 0x00000800,
        EF_IOPL = 0x00003000,
        EF_IOPL_RING0 = 0x00000000,
        EF_IOPL_RING1 = 0x00001000,
        EF_IOPL_RING2 = 0x00002000,
        EF_NT   = 0x00004000,   /* nested task */
        EF_RF   = 0x00010000,   /* resume */
        EF_VM   = 0x00020000,   /* virtual mode */
        EF_AC   = 0x00040000,   /* alignment */
        EF_VIF  = 0x00080000,   /* virtual interrupt */
        EF_VIP  = 0x00100000,   /* virtual interrupt pending */
        EF_ID   = 0x00200000,   /* id */
};

#ifdef __KERNEL__

#include <asm/vm86.h>
#include <asm/segment.h>

struct task_struct;
extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code);

/*
 * user_mode_vm(regs) determines whether a register set came from user mode.
 * This is true if V8086 mode was enabled OR if the register set was from
 * protected mode with RPL-3 CS value.  This tricky test checks that with
 * one comparison.  Many places in the kernel can bypass this full check
 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 */
static inline int user_mode(struct pt_regs *regs)
{
	return (regs->xcs & SEGMENT_RPL_MASK) == USER_RPL;
}
static inline int user_mode_vm(struct pt_regs *regs)
{
	return ((regs->xcs & SEGMENT_RPL_MASK) | (regs->eflags & VM_MASK)) >= USER_RPL;
}

#define instruction_pointer(regs) ((regs)->eip)
#define regs_return_value(regs) ((regs)->eax)

extern unsigned long profile_pc(struct pt_regs *regs);
#endif /* __KERNEL__ */

#endif