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316 lines
7.8 KiB
C
316 lines
7.8 KiB
C
/*
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* Bedbug Functions specific to the MPC860 chip
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*/
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#include <common.h>
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#include <command.h>
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#include <linux/ctype.h>
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#include <bedbug/bedbug.h>
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#include <bedbug/regs.h>
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#include <bedbug/ppc.h>
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#include <bedbug/type.h>
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#if defined(CONFIG_CMD_BEDBUG) && defined(CONFIG_8xx)
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#define MAX_BREAK_POINTS 2
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extern CPU_DEBUG_CTX bug_ctx;
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void bedbug860_init __P((void));
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void bedbug860_do_break __P((cmd_tbl_t*,int,int,char*[]));
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void bedbug860_break_isr __P((struct pt_regs*));
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int bedbug860_find_empty __P((void));
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int bedbug860_set __P((int,unsigned long));
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int bedbug860_clear __P((int));
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/* ======================================================================
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* Initialize the global bug_ctx structure for the MPC860. Clear all
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* of the breakpoints.
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* ====================================================================== */
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void bedbug860_init( void )
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{
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int i;
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/* -------------------------------------------------- */
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bug_ctx.hw_debug_enabled = 0;
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bug_ctx.stopped = 0;
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bug_ctx.current_bp = 0;
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bug_ctx.regs = NULL;
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bug_ctx.do_break = bedbug860_do_break;
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bug_ctx.break_isr = bedbug860_break_isr;
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bug_ctx.find_empty = bedbug860_find_empty;
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bug_ctx.set = bedbug860_set;
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bug_ctx.clear = bedbug860_clear;
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for( i = 1; i <= MAX_BREAK_POINTS; ++i )
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(*bug_ctx.clear)( i );
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puts ("BEDBUG:ready\n");
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return;
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} /* bedbug_init_breakpoints */
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/* ======================================================================
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* Set/clear/show one of the hardware breakpoints for the 860. The "off"
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* string will disable a specific breakpoint. The "show" string will
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* display the current breakpoints. Otherwise an address will set a
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* breakpoint at that address. Setting a breakpoint uses the CPU-specific
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* set routine which will assign a breakpoint number.
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* ====================================================================== */
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void bedbug860_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
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char *argv[])
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{
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long addr = 0; /* Address to break at */
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int which_bp; /* Breakpoint number */
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/* -------------------------------------------------- */
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if (argc < 2)
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{
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cmd_usage(cmdtp);
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return;
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}
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/* Turn off a breakpoint */
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if( strcmp( argv[ 1 ], "off" ) == 0 )
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{
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if( bug_ctx.hw_debug_enabled == 0 )
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{
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printf( "No breakpoints enabled\n" );
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return;
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}
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which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
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if( bug_ctx.clear )
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(*bug_ctx.clear)( which_bp );
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printf( "Breakpoint %d removed\n", which_bp );
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return;
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}
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/* Show a list of breakpoints */
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if( strcmp( argv[ 1 ], "show" ) == 0 )
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{
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for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
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{
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switch( which_bp )
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{
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case 1: addr = GET_CMPA(); break;
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case 2: addr = GET_CMPB(); break;
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case 3: addr = GET_CMPC(); break;
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case 4: addr = GET_CMPD(); break;
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}
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printf( "Breakpoint [%d]: ", which_bp );
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if( addr == 0 )
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printf( "NOT SET\n" );
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else
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disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
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}
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return;
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}
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/* Set a breakpoint at the address */
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if( !isdigit( argv[ 1 ][ 0 ]))
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{
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cmd_usage(cmdtp);
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return;
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}
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addr = simple_strtoul( argv[ 1 ], NULL, 16 ) & 0xfffffffc;
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if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
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{
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printf( "Breakpoint [%d]: ", which_bp );
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disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
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}
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return;
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} /* bedbug860_do_break */
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/* ======================================================================
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* Handle a breakpoint. First determine which breakpoint was hit by
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* looking at the DeBug Status Register (DBSR), clear the breakpoint
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* and enter a mini main loop. Stay in the loop until the stopped flag
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* in the debug context is cleared.
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* ====================================================================== */
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void bedbug860_break_isr( struct pt_regs *regs )
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{
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unsigned long addr; /* Address stopped at */
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unsigned long cause; /* Address stopped at */
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/* -------------------------------------------------- */
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cause = GET_ICR();
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if( !(cause & 0x00000004)) {
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printf( "Not an instruction breakpoint (ICR 0x%08lx)\n", cause );
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return;
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}
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addr = regs->nip;
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if( addr == GET_CMPA() )
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{
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bug_ctx.current_bp = 1;
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}
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else if( addr == GET_CMPB() )
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{
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bug_ctx.current_bp = 2;
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}
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else if( addr == GET_CMPC() )
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{
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bug_ctx.current_bp = 3;
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}
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else if( addr == GET_CMPD() )
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{
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bug_ctx.current_bp = 4;
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}
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bedbug_main_loop( addr, regs );
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return;
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} /* bedbug860_break_isr */
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/* ======================================================================
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* Look through all of the hardware breakpoints available to see if one
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* is unused.
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* ====================================================================== */
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int bedbug860_find_empty( void )
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{
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/* -------------------------------------------------- */
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if( GET_CMPA() == 0 )
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return 1;
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if( GET_CMPB() == 0 )
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return 2;
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if( GET_CMPC() == 0 )
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return 3;
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if( GET_CMPD() == 0 )
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return 4;
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return 0;
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} /* bedbug860_find_empty */
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/* ======================================================================
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* Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
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* number, otherwise reassign the given breakpoint. If hardware debugging
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* is not enabled, then turn it on via the MSR and DBCR0. Set the break
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* address in the appropriate IACx register and enable proper address
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* beakpoint in DBCR0.
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* ====================================================================== */
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int bedbug860_set( int which_bp, unsigned long addr )
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{
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/* -------------------------------------------------- */
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/* Only look if which_bp == 0, else use which_bp */
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if(( bug_ctx.find_empty ) && ( !which_bp ) &&
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( which_bp = (*bug_ctx.find_empty)()) == 0 )
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{
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printf( "All breakpoints in use\n" );
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return 0;
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}
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if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
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{
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printf( "Invalid break point # %d\n", which_bp );
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return 0;
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}
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if( ! bug_ctx.hw_debug_enabled )
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{
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bug_ctx.hw_debug_enabled = 1;
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SET_DER( GET_DER() | 0x00000004 );
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}
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switch( which_bp )
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{
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case 1:
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SET_CMPA( addr );
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SET_ICTRL( GET_ICTRL() | 0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */
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break;
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case 2:
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SET_CMPB( addr );
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SET_ICTRL( GET_ICTRL() | 0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */
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break;
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case 3:
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SET_CMPC( addr );
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SET_ICTRL( GET_ICTRL() | 0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */
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break;
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case 4:
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SET_CMPD( addr );
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SET_ICTRL( GET_ICTRL() | 0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */
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break;
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}
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return which_bp;
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} /* bedbug860_set */
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/* ======================================================================
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* Disable a specific breakoint by setting the appropriate IACx register
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* to zero and claring the instruction address breakpoint in DBCR0.
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* ====================================================================== */
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int bedbug860_clear( int which_bp )
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{
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/* -------------------------------------------------- */
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if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
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{
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printf( "Invalid break point # (%d)\n", which_bp );
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return -1;
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}
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switch( which_bp )
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{
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case 1:
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SET_CMPA( 0 );
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SET_ICTRL( GET_ICTRL() & ~0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */
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break;
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case 2:
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SET_CMPB( 0 );
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SET_ICTRL( GET_ICTRL() & ~0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */
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break;
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case 3:
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SET_CMPC( 0 );
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SET_ICTRL( GET_ICTRL() & ~0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */
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break;
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case 4:
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SET_CMPD( 0 );
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SET_ICTRL( GET_ICTRL() & ~0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */
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break;
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}
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return 0;
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} /* bedbug860_clear */
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/* ====================================================================== */
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#endif
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