trace_intr.c

TRACE的源代码,在LINUX调试程序要使用的.

/*  This file (trace_intr.c) was created by Ron Rechenmacher <[e-mail]> on
    Dec 15, 1999. "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_C_REV	"\
$RCSfile: trace_intr.c,v $(alpha)\
$Revision: 1.3 $\
$Date: 2002/03/12 14:36:38 $"

#include <linux/trace.h>	/* traceControl_sp */
#include <asm/trace_intr.h>	/* TRACE_VECTOR, BUILD_TRACE_INTERRUPT */

/*  NOTE: For some reason, if the definition is placed after the includes,
    the EXPORT_SYMBOL macro and /sbin/genksyms functionality does not work */
char *trace_intr_c_rev = __TRACE_INTR_C_REV __TRACE_H_REV __TRACE_PROCESSOR_H_REV __TRACE_INTR_H_REV;

#include <linux/kernel.h>	/*  printk and includes linux/linkage.h for
				    __ALIGN_STR */
#include <asm/uaccess.h>	/* copy_from_user(to,from,n) */

#include <linux/ptrace.h>	/* struct pt_regs needed by irq.h */
#include <linux/sched.h>	/* NULL needed by smp_lock.h */
#include <linux/smp.h>		/* NO_PROC_ID needed by smp_lock.h */
#include <linux/smp_lock.h>	/* spinlock_t needed by irq.h */
#include <linux/sched.h>	/* prof_buffer needed by irq.h */
#include "irq.h"		/* SAVE_ALL used in BUILD_TRACE_INTERRUPT */


/******************************************************************************
 *
 */

asmlinkage void
do_trace_interrupt(  struct timeval	*time
		   , int		tid
		   , void		*ap )
{
	char			lcl_msg[traceControl_sp->messageSize_bytes];
	struct
	{   int		lvl;
	    char	*msg;
#	    if TRACE_COMPILER_DOES_DYNAMIC_ARRAYS == 1
	    int		params[traceControl_sp->numberOfParameter_integers];
#	    else
	    int		params[TRACE_NUM_PARAMETER_INTS];
#	    endif
	}			kk;
	struct s_traceEntry	*ep;
	int			ii, *ip;


    copy_from_user( &kk, ap, sizeof(kk) );

    /* COPYING MESSAGE TWICE!!! NEED TO WORK ON THIS */
    copy_from_user( lcl_msg, kk.msg, traceControl_sp->messageSize_bytes );

    kk.msg = lcl_msg; /* over write with kernel address */


    ep = (struct s_traceEntry *)traceCircularQueueIncrement();

    do_gettimeofday( &ep->time );

    TRACE_ENTRY_SPECIFIC( ep );
    ep->pid = current->pid;
    ep->cpu = smp_processor_id();

    ep->tid = tid;

    ep->lvl = kk.lvl;
    strncpy( &(ep->data[0]), kk.msg, traceControl_sp->messageSize_bytes );

    /*  may need to, depending upon alignment issues, add the restriction
	that messageSize_bytes must be a multiple if sizeof(int)
        see also trace_proc.c:XXX */
    ip = (int *)&(ep->data[traceControl_sp->messageSize_bytes]);
    for (ii=0; ii<traceControl_sp->numberOfParameter_integers; ii++)
        ip[ii] = kk.params[ii];


    copy_to_user( time, &ep->time, sizeof(struct timeval) );

    return;
}   /* do_trace_interrupt */



/******************************************************************************
 *  trace_interrupt_init
 *
 */

/*  defined in arch/alpha/kernel/traps.c
    Note: do_trace_interrupt is called (via this function ptr) from
    arch/alpha/kernel/traps.c:do_entIF() which is called from
    arch/alpha/kernel/entry.S:entIF: which does
    "lda     $26,ret_from_sys_call"
    
*/
extern void (*trace_interrupt_routine)(  struct timeval	*time
				       , int		tid
				       , void		*ap );
void
trace_interrupt_init( void )
{

    trace_interrupt_routine = do_trace_interrupt;
    return;
}   /* trace_interrupt_init */



/* ######################################################################### */

/*  EXPORT_SYMTAB get defined on the compile line for OX_OBJS make file
    target */
#include <linux/module.h>	/* has module code - effects alignment! */

/* traceControl_sp export in kernel/ksyms.c */
EXPORT_SYMBOL( traceCircularQueuePut );/* used in i386 arch */
EXPORT_SYMBOL( traceCircularQueueIncrement );
EXPORT_SYMBOL( trace_interrupt_routine );

#ifdef MODULE
/*  gcc -O -Wall -DMODULE -D__KERNEL__ -D__SMP__ -c trace_intr.c -o trace_intr.mod.o
	OR
    gcc -O -Wall -DMODULE -D__KERNEL__ -D__SMP__ -c trace_intr.c -o trace_intr.mod.o \
-DMODVERSIONS -DEXPORT_SYMTAB \
-include /usr/src/linux/include/linux/modversions.h

        OR, for non SMP

    gcc -O -Wall -DMODULE -D__KERNEL__ -c trace_intr.c -o trace_intr.mod.o
	OR
    gcc -O -Wall -DMODULE -D__KERNEL__ -c trace_intr.c -o trace_intr.mod.o \
-DMODVERSIONS -DEXPORT_SYMTAB \
-include /usr/src/linux/include/linux/modversions.h

FOR ALPHA, YOU MUST ADD "-mno-fp-regs -ffixed-8" TO AVOID COMPILE
"global register variable follows a function definition" ERROR

*/

int
init_module( void )
{   printk( "init for trace_intr - configuring interrupt\n" );
    trace_interrupt_init();
    return (0);
}

void
cleanup_module( void )
{   printk( "trace_intr: clearing trace_interrupt_routine\n" );
    trace_interrupt_routine = 0;
}

#endif /* MODULE */