trace_intr.h

TRACE的源代码,在LINUX调试程序要使用的.

#ifndef __ASM_TRACE_USER_H
#define __ASM_TRACE_USER_H
/*  This file (trace_user.h) was created by Ron Rechenmacher <[e-mail]> on
    June 1, 2000. "TERMS AND CONDITIONS" governing this file are in the README
    or COPYING file. If you do not have such a file, one can be obtained by
    contacting Ron or Fermi Lab in Batavia IL, 60510, phone: [phone].
*/
#define __TRACE_INTR_H_REV	"\
$RCSfile: trace_intr.h,v $(ppc)\
$Revision: 1.2 $\
$Date: 2001/08/25 08:53:35 $"

#define TRACE_VECTOR		99 /*  arbitrary - must match compare value
				       in head.S  */

#ifdef __KERNEL__ /* ------------------------------------------------------- */

void
trace_interrupt_init( void );


#else /* of ifdef __KERNEL__ ----------------------------------------------- */

/******************************************************************************
 *  trace_function
 *
 *  It is OK that this is a function call as the "if" statement in the
 *  TRACE macro is the critical item.
 *  And since we can make it a function (where everything will be organized
 *  on the stack, all we have to do is pass a pointer to the start location
 *  on the stack.
 *
 *  Ref. glibc-2.1.3/sysdeps/unix/sysv/linux/powerpc/sysdep.h
 *    and receiving code in arch/ppc/kernel/head.S????
 *
 *  Ref. also include/asm-ppc/unistd.h
 */

static void
trace_function(  struct timeval	*time
	       ,  int		tid
	       /*, int		lvl
	       , char		*msg*/
	       , ... )
{
	va_list         ap;
	int             ii;
	struct
	{   int         lvl;
	    char        *msg;
	    int         params[traceControl_sp->numberOfParameter_integers];
	}                       kk;

    va_start( ap, tid );
    kk.lvl = va_arg( ap, int );
    kk.msg = va_arg( ap, char * );
    for (ii=0; ii<traceControl_sp->numberOfParameter_integers; ii++)
    {   kk.params[ii] = va_arg( ap, int );
    }
    va_end( ap );

    {
#       if 0
	register long   __sc_0 __asm__("r0");
	register long   __sc_4 __asm__("r4");
	register long   __sc_5 __asm__("r5");
	register long   __sc_6 __asm__("r6");

	__sc_0 = (long)time;
	__sc_4 = TRACE_VECTOR;
	__sc_5 = (long)tid;
	__sc_6 = (long)&kk;
#       else
	/*  The above can be optimized away! I looked at the asm code
	    generated and placed it below (after searching the source for
	    examples of asm using lwz and finding that I need to use the
	    "m" operand constraint). */
	__asm__ __volatile__("lwz 0,%0" : : "m" (time)         : "r0" );
	__asm__ __volatile__("li  4,%0" : : "i" (TRACE_VECTOR) : "r4" );
	__asm__ __volatile__("lwz 5,%0" : : "m" (tid)          : "r5" );
	__asm__ __volatile__("mr  6,%0" : : "g" ((long)&kk)    : "r6" );
#       endif

#	define __syscall_clobbers \
        "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
	__asm__ __volatile__ ("trap           \n\t"
			      : 
			      :
			      : __syscall_clobbers );
    }
    return;
}   /* trace_function */


#endif	/* of else of ifdef __KERNEL__ ------------------------------------- */

#endif /* __ASM_TRACE_USER_H */