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Annotation of sys/arch/powerpc/ddb/db_memrw.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $NetBSD: db_memrw.c,v 1.4 2001/05/18 20:38:27 matt Exp $        */
                      2: /*     $OpenBSD: db_memrw.c,v 1.5 2003/10/15 01:06:13 drahn Exp $      */
                      3:
                      4: /*
                      5:  * Mach Operating System
                      6:  * Copyright (c) 1992 Carnegie Mellon University
                      7:  * All Rights Reserved.
                      8:  *
                      9:  * Permission to use, copy, modify and distribute this software and its
                     10:  * documentation is hereby granted, provided that both the copyright
                     11:  * notice and this permission notice appear in all copies of the
                     12:  * software, derivative works or modified versions, and any portions
                     13:  * thereof, and that both notices appear in supporting documentation.
                     14:  *
                     15:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     16:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     17:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     18:  *
                     19:  * Carnegie Mellon requests users of this software to return to
                     20:  *
                     21:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     22:  *  School of Computer Science
                     23:  *  Carnegie Mellon University
                     24:  *  Pittsburgh PA 15213-3890
                     25:  *
                     26:  * any improvements or extensions that they make and grant Carnegie Mellon
                     27:  * the rights to redistribute these changes.
                     28:  */
                     29:
                     30: /*
                     31:  * Interface to the debugger for virtual memory read/write.
                     32:  * This is a simple version for kernels with writable text.
                     33:  * For an example of read-only kernel text, see the file:
                     34:  * sys/arch/sun3/sun3/db_memrw.c
                     35:  *
                     36:  * ALERT!  If you want to access device registers with a
                     37:  * specific size, then the read/write functions have to
                     38:  * make sure to do the correct sized pointer access.
                     39:  */
                     40:
                     41: #include <sys/param.h>
                     42: #include <sys/proc.h>
                     43: #include <sys/systm.h>
                     44:
                     45: #include <uvm/uvm_extern.h>
                     46:
                     47: #include <machine/db_machdep.h>
                     48: #include <machine/pcb.h>
                     49:
                     50: #include <ddb/db_access.h>
                     51:
                     52: /*
                     53:  * Read bytes from kernel address space for debugger.
                     54:  */
                     55: void
                     56: db_read_bytes(addr, size, data)
                     57:        vaddr_t         addr;
                     58:        size_t  size;
                     59:        char    *data;
                     60: {
                     61:        char    *src = (char *)addr;
                     62:        faultbuf env;
                     63:        faultbuf *old_onfault = curpcb->pcb_onfault;
                     64:        if (setfault(&env)) {
                     65:                curpcb->pcb_onfault = old_onfault;
                     66:                return;
                     67:        }
                     68:
                     69:        if (size == 4) {
                     70:                *((int *)data) = *((int *)src);
                     71:        } else if (size == 2) {
                     72:                *((short *)data) = *((short *)src);
                     73:        } else {
                     74:                while (size > 0) {
                     75:                        --size;
                     76:                        *data++ = *src++;
                     77:                }
                     78:        }
                     79:        curpcb->pcb_onfault = old_onfault;
                     80: }
                     81:
                     82: /*
                     83:  * Write bytes to kernel address space for debugger.
                     84:  */
                     85: void
                     86: db_write_bytes(addr, size, data)
                     87:        vaddr_t         addr;
                     88:        size_t  size;
                     89:        char    *data;
                     90: {
                     91:        char    *dst = (char *)addr;
                     92:        faultbuf env;
                     93:        faultbuf *old_onfault = curpcb->pcb_onfault;
                     94:
                     95:        if (setfault(&env)) {
                     96:                curpcb->pcb_onfault = old_onfault;
                     97:                return;
                     98:        }
                     99:
                    100:        if (size == 4) {
                    101:                *((int *)dst) = *((int *)data);
                    102:        } else if (size == 2) {
                    103:                *((short *)dst) = *((short *)data);
                    104:        } else  {
                    105:                while (size > 0) {
                    106:                        --size;
                    107:                        *dst++ = *data++;
                    108:                }
                    109:        }
                    110:        syncicache((void *)addr, size);
                    111:        curpcb->pcb_onfault = old_onfault;
                    112: }
                    113: