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Annotation of XNU/osfmk/kdp/ml/i386/kdp_machdep.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1997 Apple Computer, Inc.  All rights reserved.
        !            24:  * Copyright (c) 1994 NeXT Computer, Inc.  All rights reserved.
        !            25:  *
        !            26:  * machdep/ppc/kdp_machdep.c
        !            27:  *
        !            28:  * Machine-dependent code for Remote Debugging Protocol
        !            29:  *
        !            30:  * March, 1997 Created.        Umesh Vaishampayan [[email protected]]
        !            31:  *
        !            32:  */
        !            33:  
        !            34: #include <mach/mach_types.h>
        !            35: #include <mach/machine.h>
        !            36: #include <mach/exception_types.h>
        !            37: #include <i386/trap.h>
        !            38: #include <kdp/kdp_internal.h>
        !            39: 
        !            40: #define KDP_TEST_HARNESS 0
        !            41: #if KDP_TEST_HARNESS
        !            42: #define dprintf(x) printf x
        !            43: #else
        !            44: #define dprintf(x)
        !            45: #endif
        !            46: 
        !            47: void print_saved_state(void *);
        !            48: void kdp_call(void);
        !            49: void kdp_i386_trap(unsigned int, struct i386_saved_state *, kern_return_t, vm_offset_t);
        !            50: int kdp_getc(void);
        !            51: 
        !            52: void
        !            53: kdp_exception(
        !            54:     unsigned char      *pkt,
        !            55:     int        *len,
        !            56:     unsigned short     *remote_port,
        !            57:     unsigned int       exception,
        !            58:     unsigned int       code,
        !            59:     unsigned int       subcode
        !            60: )
        !            61: {
        !            62:     kdp_exception_t    *rq = (kdp_exception_t *)pkt;
        !            63: 
        !            64:     rq->hdr.request = KDP_EXCEPTION;
        !            65:     rq->hdr.is_reply = 0;
        !            66:     rq->hdr.seq = kdp.exception_seq;
        !            67:     rq->hdr.key = 0;
        !            68:     rq->hdr.len = sizeof (*rq);
        !            69:     
        !            70:     rq->n_exc_info = 1;
        !            71:     rq->exc_info[0].cpu = 0;
        !            72:     rq->exc_info[0].exception = exception;
        !            73:     rq->exc_info[0].code = code;
        !            74:     rq->exc_info[0].subcode = subcode;
        !            75:     
        !            76:     rq->hdr.len += rq->n_exc_info * sizeof (kdp_exc_info_t);
        !            77:     
        !            78:     bcopy((char *)rq, (char *)pkt, rq->hdr.len);
        !            79: 
        !            80:     kdp.exception_ack_needed = TRUE;
        !            81:     
        !            82:     *remote_port = kdp.exception_port;
        !            83:     *len = rq->hdr.len;
        !            84: }
        !            85: 
        !            86: boolean_t
        !            87: kdp_exception_ack(
        !            88:     unsigned char      *pkt,
        !            89:     int                        len
        !            90: )
        !            91: {
        !            92:     kdp_exception_ack_t        *rq = (kdp_exception_ack_t *)pkt;
        !            93: 
        !            94:     if (len < sizeof (*rq))
        !            95:        return(FALSE);
        !            96:        
        !            97:     if (!rq->hdr.is_reply || rq->hdr.request != KDP_EXCEPTION)
        !            98:        return(FALSE);
        !            99:        
        !           100:     dprintf(("kdp_exception_ack seq %x %x\n", rq->hdr.seq, kdp.exception_seq));
        !           101:        
        !           102:     if (rq->hdr.seq == kdp.exception_seq) {
        !           103:        kdp.exception_ack_needed = FALSE;
        !           104:        kdp.exception_seq++;
        !           105:     }
        !           106:     return(TRUE);
        !           107: }
        !           108: 
        !           109: void
        !           110: kdp_getstate(
        !           111:     i386_thread_state_t                *state
        !           112: )
        !           113: {
        !           114:     struct i386_saved_state    *saved_state;
        !           115:     
        !           116:     saved_state = (struct i386_saved_state *)kdp.saved_state;
        !           117:     
        !           118:     *state = (i386_thread_state_t) { 0 };      
        !           119:     state->eax = saved_state->eax;
        !           120:     state->ebx = saved_state->ebx;
        !           121:     state->ecx = saved_state->ecx;
        !           122:     state->edx = saved_state->edx;
        !           123:     state->edi = saved_state->edi;
        !           124:     state->esi = saved_state->esi;
        !           125:     state->ebp = saved_state->ebp;
        !           126: 
        !           127:     if ((saved_state->cs & 0x3) == 0){ /* Kernel State */
        !           128:        state->esp = (unsigned int) &saved_state->uesp;
        !           129:         state->ss = KERNEL_DS;
        !           130:     } else {
        !           131:        state->esp = saved_state->uesp;
        !           132:        state->ss = saved_state->ss;
        !           133:     }
        !           134: 
        !           135:     state->eflags = saved_state->efl;
        !           136:     state->eip = saved_state->eip;
        !           137:     state->cs = saved_state->cs;
        !           138:     state->ds = saved_state->ds;
        !           139:     state->es = saved_state->es;
        !           140:     state->fs = saved_state->fs;
        !           141:     state->gs = saved_state->gs;
        !           142: }
        !           143: 
        !           144: 
        !           145: void
        !           146: kdp_setstate(
        !           147:     i386_thread_state_t                *state
        !           148: )
        !           149: {
        !           150:     struct i386_saved_state    *saved_state;
        !           151:     
        !           152:     saved_state = (struct i386_saved_state *)kdp.saved_state;
        !           153: 
        !           154:     saved_state->eax = state->eax;
        !           155:     saved_state->ebx = state->ebx;
        !           156:     saved_state->ecx = state->ecx;
        !           157:     saved_state->edx = state->edx;
        !           158:     saved_state->edi = state->edi;
        !           159:     saved_state->esi = state->esi;
        !           160:     saved_state->ebp = state->ebp;
        !           161:     saved_state->efl = state->eflags;
        !           162: #if    0
        !           163:     saved_state->frame.eflags &= ~( EFL_VM | EFL_NT | EFL_IOPL | EFL_CLR );
        !           164:     saved_state->frame.eflags |=  ( EFL_IF | EFL_SET );
        !           165: #endif
        !           166:     saved_state->eip = state->eip;
        !           167:     saved_state->fs = state->fs;
        !           168:     saved_state->gs = state->gs;
        !           169: }
        !           170: 
        !           171: 
        !           172: kdp_error_t
        !           173: kdp_machine_read_regs(
        !           174:     unsigned int cpu,
        !           175:     unsigned int flavor,
        !           176:     char *data,
        !           177:     int *size
        !           178: )
        !           179: {
        !           180:     switch (flavor) {
        !           181: 
        !           182:     case i386_THREAD_STATE:
        !           183:        dprintf(("kdp_readregs THREAD_STATE\n"));
        !           184:        kdp_getstate((i386_thread_state_t *)data);
        !           185:        *size = sizeof (i386_thread_state_t);
        !           186:        return KDPERR_NO_ERROR;
        !           187:        
        !           188:     case i386_THREAD_FPSTATE:
        !           189:        dprintf(("kdp_readregs THREAD_FPSTATE\n"));
        !           190:        *(i386_thread_fpstate_t *)data = (i386_thread_fpstate_t) { 0 }; 
        !           191:        *size = sizeof (i386_thread_fpstate_t);
        !           192:        return KDPERR_NO_ERROR;
        !           193:        
        !           194:     default:
        !           195:        dprintf(("kdp_readregs bad flavor %d\n"));
        !           196:        return KDPERR_BADFLAVOR;
        !           197:     }
        !           198: }
        !           199: 
        !           200: kdp_error_t
        !           201: kdp_machine_write_regs(
        !           202:     unsigned int cpu,
        !           203:     unsigned int flavor,
        !           204:     char *data,
        !           205:     int *size
        !           206: )
        !           207: {
        !           208:     switch (flavor) {
        !           209: 
        !           210:     case i386_THREAD_STATE:
        !           211:        dprintf(("kdp_writeregs THREAD_STATE\n"));
        !           212:        kdp_setstate((i386_thread_state_t *)data);
        !           213:        return KDPERR_NO_ERROR;
        !           214:        
        !           215:     case i386_THREAD_FPSTATE:
        !           216:        dprintf(("kdp_writeregs THREAD_FPSTATE\n"));
        !           217:        return KDPERR_NO_ERROR;
        !           218:        
        !           219:     default:
        !           220:        dprintf(("kdp_writeregs bad flavor %d\n"));
        !           221:        return KDPERR_BADFLAVOR;
        !           222:     }
        !           223: }
        !           224: 
        !           225: 
        !           226: 
        !           227: void
        !           228: kdp_machine_hostinfo(
        !           229:     kdp_hostinfo_t *hostinfo
        !           230: )
        !           231: {
        !           232:     machine_slot_t     m;
        !           233:     int                        i;
        !           234: 
        !           235:     hostinfo->cpus_mask = 0;
        !           236: 
        !           237:     for (i = 0; i < machine_info.max_cpus; i++) {
        !           238:         m = &machine_slot[i];
        !           239:         if (!m->is_cpu)
        !           240:             continue;
        !           241:        
        !           242:         hostinfo->cpus_mask |= (1 << i);
        !           243:     }
        !           244: 
        !           245:    /* FIXME?? */
        !           246:     hostinfo->cpu_type = CPU_TYPE_I386;
        !           247:     hostinfo->cpu_subtype = CPU_SUBTYPE_486;
        !           248: }
        !           249: 
        !           250: void
        !           251: kdp_panic(
        !           252:     const char         *msg
        !           253: )
        !           254: {
        !           255:     printf("kdp panic: %s\n", msg);    
        !           256:     __asm__ volatile("hlt");   
        !           257: }
        !           258: 
        !           259: 
        !           260: void
        !           261: kdp_reboot(void)
        !           262: {
        !           263:     kdreboot();
        !           264: }
        !           265: 
        !           266: int
        !           267: kdp_intr_disbl(void)
        !           268: {
        !           269:    return splhigh();
        !           270: }
        !           271: 
        !           272: void
        !           273: kdp_intr_enbl(int s)
        !           274: {
        !           275:        splx(s);
        !           276: }
        !           277: 
        !           278: int
        !           279: kdp_getc()
        !           280: {
        !           281:        return  cnmaygetc();
        !           282: }
        !           283: 
        !           284: void
        !           285: kdp_us_spin(int usec)
        !           286: {
        !           287:     extern void delay(int);
        !           288: 
        !           289:     delay(usec/100);
        !           290: }
        !           291: 
        !           292: void print_saved_state(void *state)
        !           293: {
        !           294:     struct i386_saved_state    *saved_state;
        !           295: 
        !           296:     saved_state = state;
        !           297: 
        !           298:        printf("pc = 0x%x\n", saved_state->eip);
        !           299:        printf("cr3= 0x%x\n", saved_state->cr2);
        !           300:        printf("rp = TODO FIXME\n");
        !           301:        printf("sp = 0x%x\n", saved_state->esp);
        !           302: 
        !           303: }
        !           304: 
        !           305: void
        !           306: kdp_sync_cache()
        !           307: {
        !           308:        return; /* No op here. */
        !           309: }
        !           310: 
        !           311: void
        !           312: kdp_call()
        !           313: {
        !           314:        __asm__ volatile ("int  $3");   /* Let the processor do the work */
        !           315: }
        !           316: 
        !           317: 
        !           318: typedef struct _cframe_t {
        !           319:     struct _cframe_t   *prev;
        !           320:     unsigned           caller;
        !           321:     unsigned           args[0];
        !           322: } cframe_t;
        !           323: 
        !           324: 
        !           325: #define MAX_FRAME_DELTA                65536
        !           326: 
        !           327: void
        !           328: kdp_i386_backtrace(void        *_frame, int nframes)
        !           329: {
        !           330:        cframe_t        *frame = (cframe_t *)_frame;
        !           331:        int i;
        !           332: 
        !           333:        for (i=0; i<nframes; i++) {
        !           334:            if ((vm_offset_t)frame < VM_MIN_KERNEL_ADDRESS ||
        !           335:                (vm_offset_t)frame > VM_MAX_KERNEL_ADDRESS) {
        !           336:                goto invalid;
        !           337:            }
        !           338:            printf("frame %x called by %x ",
        !           339:                frame, frame->caller);
        !           340:            printf("args %x %x %x %x\n",
        !           341:                frame->args[0], frame->args[1],
        !           342:                frame->args[2], frame->args[3]);
        !           343:            if ((frame->prev < frame) ||        /* wrong direction */
        !           344:                ((frame->prev - frame) > MAX_FRAME_DELTA)) {
        !           345:                goto invalid;
        !           346:            }
        !           347:            frame = frame->prev;
        !           348:        }
        !           349:        return;
        !           350: invalid:
        !           351:        printf("invalid frame pointer %x\n",frame->prev);
        !           352: }
        !           353: 
        !           354: void
        !           355: kdp_i386_trap(
        !           356:     unsigned int               trapno,
        !           357:     struct i386_saved_state    *saved_state,
        !           358:     kern_return_t      result,
        !           359:     vm_offset_t                va
        !           360: )
        !           361: {
        !           362:     unsigned int exception, subcode = 0, code;
        !           363: 
        !           364:     if (trapno != T_INT3 && trapno != T_DEBUG)
        !           365:        printf("unexpected kernel trap %x eip %x\n", trapno, saved_state->eip);
        !           366: 
        !           367:     switch (trapno) {
        !           368:     
        !           369:     case T_DIVIDE_ERROR:
        !           370:        exception = EXC_ARITHMETIC;
        !           371:        code = EXC_I386_DIVERR;
        !           372:        break;
        !           373:     
        !           374:     case T_OVERFLOW:
        !           375:        exception = EXC_SOFTWARE;
        !           376:        code = EXC_I386_INTOFLT;
        !           377:        break;
        !           378:     
        !           379:     case T_OUT_OF_BOUNDS:
        !           380:        exception = EXC_ARITHMETIC;
        !           381:        code = EXC_I386_BOUNDFLT;
        !           382:        break;
        !           383:     
        !           384:     case T_INVALID_OPCODE:
        !           385:        exception = EXC_BAD_INSTRUCTION;
        !           386:        code = EXC_I386_INVOPFLT;
        !           387:        break;
        !           388:     
        !           389:     case T_SEGMENT_NOT_PRESENT:
        !           390:        exception = EXC_BAD_INSTRUCTION;
        !           391:        code = EXC_I386_SEGNPFLT;
        !           392:        subcode = saved_state->err;
        !           393:        break;
        !           394:     
        !           395:     case T_STACK_FAULT:
        !           396:        exception = EXC_BAD_INSTRUCTION;
        !           397:        code = EXC_I386_STKFLT;
        !           398:        subcode = saved_state->err;
        !           399:        break;
        !           400:     
        !           401:     case T_GENERAL_PROTECTION:
        !           402:        exception = EXC_BAD_INSTRUCTION;
        !           403:        code = EXC_I386_GPFLT;
        !           404:        subcode = saved_state->err;
        !           405:        break;
        !           406:        
        !           407:     case T_PAGE_FAULT:
        !           408:        exception = EXC_BAD_ACCESS;
        !           409:        code = result;
        !           410:        subcode = va;
        !           411:        break;
        !           412:     
        !           413:     case T_WATCHPOINT:
        !           414:        exception = EXC_SOFTWARE;
        !           415:        code = EXC_I386_ALIGNFLT;
        !           416:        break;
        !           417:        
        !           418:     case T_DEBUG:
        !           419:     case T_INT3:
        !           420:        exception = EXC_BREAKPOINT;
        !           421:        code = EXC_I386_BPTFLT;
        !           422:        break;
        !           423: 
        !           424:     default:
        !           425:        exception = EXC_BAD_INSTRUCTION;
        !           426:        code = trapno;
        !           427:        break;
        !           428:     }
        !           429: 
        !           430: //  kdp_i386_backtrace((void *) saved_state->ebp, 10);
        !           431: 
        !           432:     kdp_raise_exception(exception, code, subcode, saved_state);
        !           433: }
        !           434: 
        !           435: boolean_t 
        !           436: kdp_call_kdb(
        !           437:         void) 
        !           438: {       
        !           439:         return(FALSE);
        !           440: }

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