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/*
* Bedbug Functions specific to the MPC603e core
*/
#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <bedbug/type.h>
#include <bedbug/bedbug.h>
#include <bedbug/regs.h>
#include <bedbug/ppc.h>
#if defined(CONFIG_CMD_BEDBUG) \
&& (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
#define MAX_BREAK_POINTS 1
extern CPU_DEBUG_CTX bug_ctx;
void bedbug603e_init __P((void));
void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*const[]));
void bedbug603e_break_isr __P((struct pt_regs*));
int bedbug603e_find_empty __P((void));
int bedbug603e_set __P((int,unsigned long));
int bedbug603e_clear __P((int));
/* ======================================================================
* Initialize the global bug_ctx structure for the processor. Clear all
* of the breakpoints.
* ====================================================================== */
void bedbug603e_init( void )
{
int i;
/* -------------------------------------------------- */
bug_ctx.hw_debug_enabled = 0;
bug_ctx.stopped = 0;
bug_ctx.current_bp = 0;
bug_ctx.regs = NULL;
bug_ctx.do_break = bedbug603e_do_break;
bug_ctx.break_isr = bedbug603e_break_isr;
bug_ctx.find_empty = bedbug603e_find_empty;
bug_ctx.set = bedbug603e_set;
bug_ctx.clear = bedbug603e_clear;
for( i = 1; i <= MAX_BREAK_POINTS; ++i )
(*bug_ctx.clear)( i );
puts ("BEDBUG:ready\n");
return;
} /* bedbug_init_breakpoints */
/* ======================================================================
* Set/clear/show the hardware breakpoint for the 603e. The "off"
* string will disable a specific breakpoint. The "show" string will
* display the current breakpoints. Otherwise an address will set a
* breakpoint at that address. Setting a breakpoint uses the CPU-specific
* set routine which will assign a breakpoint number.
* ====================================================================== */
void bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
long addr; /* Address to break at */
int which_bp; /* Breakpoint number */
/* -------------------------------------------------- */
if (argc < 2)
{
cmd_usage(cmdtp);
return;
}
/* Turn off a breakpoint */
if( strcmp( argv[ 1 ], "off" ) == 0 )
{
if( bug_ctx.hw_debug_enabled == 0 )
{
puts ( "No breakpoints enabled\n" );
return;
}
which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
if( bug_ctx.clear )
(*bug_ctx.clear)( which_bp );
printf( "Breakpoint %d removed\n", which_bp );
return;
}
/* Show a list of breakpoints */
if( strcmp( argv[ 1 ], "show" ) == 0 )
{
for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
{
addr = GET_IABR();
printf( "Breakpoint [%d]: ", which_bp );
if( (addr & 0x00000002) == 0 )
puts ( "NOT SET\n" );
else
disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
}
return;
}
/* Set a breakpoint at the address */
if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
(( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
(( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
{
cmd_usage(cmdtp);
return;
}
addr = simple_strtoul( argv[ 1 ], NULL, 16 );
if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
{
printf( "Breakpoint [%d]: ", which_bp );
disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
}
return;
} /* bedbug603e_do_break */
/* ======================================================================
* Handle a breakpoint. Enter a mini main loop. Stay in the loop until
* the stopped flag in the debug context is cleared.
* ====================================================================== */
void bedbug603e_break_isr( struct pt_regs *regs )
{
unsigned long addr; /* Address stopped at */
/* -------------------------------------------------- */
bug_ctx.current_bp = 1;
addr = GET_IABR() & 0xFFFFFFFC;
bedbug_main_loop( addr, regs );
return;
} /* bedbug603e_break_isr */
/* ======================================================================
* See if the hardware breakpoint is available.
* ====================================================================== */
int bedbug603e_find_empty( void )
{
/* -------------------------------------------------- */
if( (GET_IABR() && 0x00000002) == 0 )
return 1;
return 0;
} /* bedbug603e_find_empty */
/* ======================================================================
* Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
* number, otherwise reassign the given breakpoint. If hardware debugging
* is not enabled, then turn it on via the MSR and DBCR0. Set the break
* address in the IABR register.
* ====================================================================== */
int bedbug603e_set( int which_bp, unsigned long addr )
{
/* -------------------------------------------------- */
if(( addr & 0x00000003 ) != 0 )
{
puts ( "Breakpoints must be on a 32 bit boundary\n" );
return 0;
}
/* Only look if which_bp == 0, else use which_bp */
if(( bug_ctx.find_empty ) && ( !which_bp ) &&
( which_bp = (*bug_ctx.find_empty)()) == 0 )
{
puts ( "All breakpoints in use\n" );
return 0;
}
if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
{
printf( "Invalid break point # %d\n", which_bp );
return 0;
}
if( ! bug_ctx.hw_debug_enabled )
{
bug_ctx.hw_debug_enabled = 1;
}
SET_IABR( addr | 0x00000002 );
return which_bp;
} /* bedbug603e_set */
/* ======================================================================
* Disable a specific breakoint by setting the IABR register to zero.
* ====================================================================== */
int bedbug603e_clear( int which_bp )
{
/* -------------------------------------------------- */
if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
{
printf( "Invalid break point # (%d)\n", which_bp );
return -1;
}
SET_IABR( 0 );
return 0;
} /* bedbug603e_clear */
/* ====================================================================== */
#endif
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