From 1dda0b1f7c442a7e61a7faead9adcebff3e88053 Mon Sep 17 00:00:00 2001 From: wdenk Date: Tue, 27 Aug 2002 10:52:29 +0000 Subject: Initial revision --- cpu/mpc8xx/bedbug_860.c | 318 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 318 insertions(+) create mode 100644 cpu/mpc8xx/bedbug_860.c (limited to 'cpu/mpc8xx') diff --git a/cpu/mpc8xx/bedbug_860.c b/cpu/mpc8xx/bedbug_860.c new file mode 100644 index 0000000000..05590df30a --- /dev/null +++ b/cpu/mpc8xx/bedbug_860.c @@ -0,0 +1,318 @@ +/* + * Bedbug Functions specific to the MPC860 chip + */ + +#include +#include +#include + +#include +#include +#include +#include + +#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && defined(CONFIG_MPC860) + +#define MAX_BREAK_POINTS 2 + +extern CPU_DEBUG_CTX bug_ctx; + +void bedbug860_init __P((void)); +void bedbug860_do_break __P((cmd_tbl_t*,int,int,char*[])); +void bedbug860_break_isr __P((struct pt_regs*)); +int bedbug860_find_empty __P((void)); +int bedbug860_set __P((int,unsigned long)); +int bedbug860_clear __P((int)); + + +/* ====================================================================== + * Initialize the global bug_ctx structure for the MPC860. Clear all + * of the breakpoints. + * ====================================================================== */ + +void bedbug860_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 = bedbug860_do_break; + bug_ctx.break_isr = bedbug860_break_isr; + bug_ctx.find_empty = bedbug860_find_empty; + bug_ctx.set = bedbug860_set; + bug_ctx.clear = bedbug860_clear; + + for( i = 1; i <= MAX_BREAK_POINTS; ++i ) + (*bug_ctx.clear)( i ); + + puts ("BEDBUG:ready\n"); + return; +} /* bedbug_init_breakpoints */ + + + +/* ====================================================================== + * Set/clear/show one of the hardware breakpoints for the 860. 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 bedbug860_do_break (cmd_tbl_t *cmdtp, int flag, int argc, + char *argv[]) +{ + long addr = 0; /* Address to break at */ + int which_bp; /* Breakpoint number */ + /* -------------------------------------------------- */ + + if (argc < 2) + { + printf ("Usage:\n%s\n", cmdtp->usage); + return; + } + + /* Turn off a breakpoint */ + + if( strcmp( argv[ 1 ], "off" ) == 0 ) + { + if( bug_ctx.hw_debug_enabled == 0 ) + { + printf( "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 ) + { + + switch( which_bp ) + { + case 1: addr = GET_CMPA(); break; + case 2: addr = GET_CMPB(); break; + case 3: addr = GET_CMPC(); break; + case 4: addr = GET_CMPD(); break; + } + + printf( "Breakpoint [%d]: ", which_bp ); + if( addr == 0 ) + printf( "NOT SET\n" ); + else + disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX ); + } + return; + } + + /* Set a breakpoint at the address */ + + if( !isdigit( argv[ 1 ][ 0 ])) + { + printf ("Usage:\n%s\n", cmdtp->usage); + return; + } + + addr = simple_strtoul( argv[ 1 ], NULL, 16 ) & 0xfffffffc; + + 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; +} /* bedbug860_do_break */ + + + +/* ====================================================================== + * Handle a breakpoint. First determine which breakpoint was hit by + * looking at the DeBug Status Register (DBSR), clear the breakpoint + * and enter a mini main loop. Stay in the loop until the stopped flag + * in the debug context is cleared. + * ====================================================================== */ + +void bedbug860_break_isr( struct pt_regs *regs ) +{ + unsigned long addr; /* Address stopped at */ + unsigned long cause; /* Address stopped at */ + /* -------------------------------------------------- */ + + cause = GET_ICR(); + + if( !(cause & 0x00000004)) { + printf( "Not an instruction breakpoint (ICR 0x%08lx)\n", cause ); + return; + } + + addr = regs->nip; + + if( addr == GET_CMPA() ) + { + bug_ctx.current_bp = 1; + } + else if( addr == GET_CMPB() ) + { + bug_ctx.current_bp = 2; + } + else if( addr == GET_CMPC() ) + { + bug_ctx.current_bp = 3; + } + else if( addr == GET_CMPD() ) + { + bug_ctx.current_bp = 4; + } + + bedbug_main_loop( addr, regs ); + return; +} /* bedbug860_break_isr */ + + + +/* ====================================================================== + * Look through all of the hardware breakpoints available to see if one + * is unused. + * ====================================================================== */ + +int bedbug860_find_empty( void ) +{ + /* -------------------------------------------------- */ + + if( GET_CMPA() == 0 ) + return 1; + + if( GET_CMPB() == 0 ) + return 2; + + if( GET_CMPC() == 0 ) + return 3; + + if( GET_CMPD() == 0 ) + return 4; + + return 0; +} /* bedbug860_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 appropriate IACx register and enable proper address + * beakpoint in DBCR0. + * ====================================================================== */ + +int bedbug860_set( int which_bp, unsigned long addr ) +{ + /* -------------------------------------------------- */ + + /* Only look if which_bp == 0, else use which_bp */ + if(( bug_ctx.find_empty ) && ( !which_bp ) && + ( which_bp = (*bug_ctx.find_empty)()) == 0 ) + { + printf( "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_DER( GET_DER() | 0x00000004 ); + } + + switch( which_bp ) + { + case 1: + SET_CMPA( addr ); + SET_ICTRL( GET_ICTRL() | 0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */ + break; + + case 2: + SET_CMPB( addr ); + SET_ICTRL( GET_ICTRL() | 0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */ + break; + + case 3: + SET_CMPC( addr ); + SET_ICTRL( GET_ICTRL() | 0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */ + break; + + case 4: + SET_CMPD( addr ); + SET_ICTRL( GET_ICTRL() | 0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */ + break; + } + + return which_bp; +} /* bedbug860_set */ + + + +/* ====================================================================== + * Disable a specific breakoint by setting the appropriate IACx register + * to zero and claring the instruction address breakpoint in DBCR0. + * ====================================================================== */ + +int bedbug860_clear( int which_bp ) +{ + /* -------------------------------------------------- */ + + if( which_bp < 1 || which_bp > MAX_BREAK_POINTS ) + { + printf( "Invalid break point # (%d)\n", which_bp ); + return -1; + } + + switch( which_bp ) + { + case 1: + SET_CMPA( 0 ); + SET_ICTRL( GET_ICTRL() & ~0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */ + break; + + case 2: + SET_CMPB( 0 ); + SET_ICTRL( GET_ICTRL() & ~0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */ + break; + + case 3: + SET_CMPC( 0 ); + SET_ICTRL( GET_ICTRL() & ~0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */ + break; + + case 4: + SET_CMPD( 0 ); + SET_ICTRL( GET_ICTRL() & ~0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */ + break; + } + + return 0; +} /* bedbug860_clear */ + + +/* ====================================================================== */ +#endif + -- cgit v1.2.1