src/cpus/memory_arm.c

/*
 *  Copyright (C) 2005  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *
 *
 *  $Id: memory_arm.c,v 1.27 2005/10/23 14:24:13 debug Exp $
 *
 *
 *  TODO/NOTE:  The B and/or C bits could also cause the return value to
 *  be MEMORY_NOT_FULL_PAGE, to make sure it doesn't get entered into the
 *  translation arrays. TODO: Find out if this is a good thing to do.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cpu.h"
#include "memory.h"
#include "misc.h"

#include "armreg.h"

extern int quiet_mode;


/*
 *  arm_translate_address():
 *
 *  Address translation with the MMU disabled.
 */
int arm_translate_address(struct cpu *cpu, uint64_t vaddr64,
        uint64_t *return_addr, int flags)
{
        *return_addr = vaddr64 & 0xffffffff;
        return 2;
}


/*
 *  arm_check_access():
 *
 *  Helper function.  Returns 0 for no access, 1 for read-only, and 2 for
 *  read/write.
 */
static int arm_check_access(struct cpu *cpu, int ap, int dav, int user)
{
        int s, r;

        switch (dav) {
        case 0: /*  No access at all.  */
                return 0;
        case 1: /*  Normal access check.  */
                break;
        case 2: fatal("arm_check_access(): 1 shouldn't be used\n");
                exit(1);
        case 3: /*  Anything is allowed.  */
                return 2;
        }

        switch (ap) {
        case 0: s = (cpu->cd.arm.control & ARM_CONTROL_S)? 1 : 0;
                r = (cpu->cd.arm.control & ARM_CONTROL_R)? 2 : 0;
                switch (s + r) {
                case 0: return 0;
                case 1: return user? 0 : 1;
                case 2: return 1;
                }
                fatal("arm_check_access: UNPREDICTABLE s+r value!\n");
                return 0;
        case 1: return user? 0 : 2;
        case 2: return user? 1 : 2;
        }

        /*  "case 3":  */
        return 2;
}


/*
 *  arm_translate_address_mmu():
 *
 *  Don't call this function is userland_emul is non-NULL, or cpu is NULL.
 *
 *  Return values:
 *      0  Failure
 *      1  Success, the page is readable only
 *      2  Success, the page is read/write
 *
 *  If this is a 1KB page access, then the return value is ORed with
 *  MEMORY_NOT_FULL_PAGE.
 */
int arm_translate_address_mmu(struct cpu *cpu, uint64_t vaddr64,
        uint64_t *return_addr, int flags)
{
        unsigned char *q;
        uint32_t addr, d=0, d2 = (uint32_t)(int32_t)-1, ptba, vaddr = vaddr64;
        int instr = flags & FLAG_INSTR;
        int writeflag = (flags & FLAG_WRITEFLAG)? 1 : 0;
        int useraccess = flags & MEMORY_USER_ACCESS;
        int no_exceptions = flags & FLAG_NOEXCEPTIONS;
        int user = (cpu->cd.arm.cpsr & ARM_FLAG_MODE) == ARM_MODE_USR32;
        int domain, dav, ap0,ap1,ap2,ap3, ap = 0, access = 0;
        int fs = 2;             /*  fault status (2 = terminal exception)  */
        int subpage = 0;

        if (useraccess)
                user = 1;

        addr = ((vaddr & 0xfff00000ULL) >> 18);

        if (cpu->cd.arm.translation_table == NULL ||
            cpu->cd.arm.ttb != cpu->cd.arm.last_ttb) {
                uint32_t ofs;
                cpu->cd.arm.translation_table = memory_paddr_to_hostaddr(
                    cpu->mem, cpu->cd.arm.ttb & 0x0fffffff, 0);
                if (cpu->cd.arm.translation_table != NULL) {
                        ofs = cpu->cd.arm.ttb & ((1 << BITS_PER_MEMBLOCK) - 1);
                        cpu->cd.arm.translation_table += ofs;
                }
                cpu->cd.arm.last_ttb = cpu->cd.arm.ttb;
        }

        if (cpu->cd.arm.translation_table != NULL) {
                d = *(uint32_t *)(cpu->cd.arm.translation_table + addr);
#ifdef HOST_LITTLE_ENDIAN
                if (cpu->byte_order == EMUL_BIG_ENDIAN)
#else
                if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
#endif
                        d = ((d & 0xff) << 24) | ((d & 0xff00) << 8) |
                            ((d & 0xff0000) >> 8) | ((d & 0xff000000) >> 24);
        }

        /*  Get the domain from the descriptor, and the Domain Access Value:  */
        domain = (d >> 5) & 15;
        dav = (cpu->cd.arm.dacr >> (domain * 2)) & 3;

        switch (d & 3) {

        case 0: domain = 0;
                fs = FAULT_TRANS_S;
                goto exception_return;

        case 1: /*  Course Pagetable:  */
                if (dav == 0) {
                        fs = FAULT_DOMAIN_P;
                        goto exception_return;
                }
                ptba = d & 0xfffffc00;
                addr = ptba + ((vaddr & 0x000ff000) >> 10);

                q = memory_paddr_to_hostaddr(cpu->mem, addr & 0x0fffffff, 0);
                if (q == NULL) {
                        printf("arm memory blah blah adfh asfg asdgasdg\n");
                        exit(1);
                }
                d2 = *(uint32_t *)(q + (addr & ((1 << BITS_PER_MEMBLOCK) - 1)));
#ifdef HOST_LITTLE_ENDIAN
                if (cpu->byte_order == EMUL_BIG_ENDIAN)
#else
                if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
#endif
                        d2 = ((d2 & 0xff) << 24) | ((d2 & 0xff00) << 8) |
                             ((d2 & 0xff0000) >> 8) | ((d2 & 0xff000000) >> 24);

                switch (d2 & 3) {
                case 0: fs = FAULT_TRANS_P;
                        goto exception_return;
                case 1: /*  16KB page:  */
                        ap = (d2 >> 4) & 255;
                        switch (vaddr & 0x0000c000) {
                        case 0x4000:    ap >>= 2; break;
                        case 0x8000:    ap >>= 4; break;
                        case 0xc000:    ap >>= 6; break;
                        }
                        ap &= 3;
                        *return_addr = (d2 & 0xffff0000) | (vaddr & 0x0000ffff);
                        break;
                case 2: /*  4KB page:  */
                        ap3 = (d2 >> 10) & 3;
                        ap2 = (d2 >>  8) & 3;
                        ap1 = (d2 >>  6) & 3;
                        ap0 = (d2 >>  4) & 3;
                        switch (vaddr & 0x00000c00) {
                        case 0x000: ap = ap0; break;
                        case 0x400: ap = ap1; break;
                        case 0x800: ap = ap2; break;
                        default:    ap = ap3;
                        }
                        if (ap0 != ap1 || ap0 != ap2 || ap0 != ap3)
                                subpage = 1;
                        *return_addr = (d2 & 0xfffff000) | (vaddr & 0x00000fff);
                        break;
                case 3: /*  1KB page:  */
                        subpage = 1;
                        ap = (d2 >> 4) & 3;
                        *return_addr = (d2 & 0xfffffc00) | (vaddr & 0x000003ff);
                        break;
                }
                access = arm_check_access(cpu, ap, dav, user);
                if (access > writeflag)
                        return access | (subpage? MEMORY_NOT_FULL_PAGE : 0);
                fs = FAULT_PERM_P;
                goto exception_return;

        case 2: /*  Section descriptor:  */
                if (dav == 0) {
                        fs = FAULT_DOMAIN_S;
                        goto exception_return;
                }
                *return_addr = (d & 0xfff00000) | (vaddr & 0x000fffff);
                ap = (d >> 10) & 3;
                access = arm_check_access(cpu, ap, dav, user);
                if (access > writeflag)
                        return access;
                fs = FAULT_PERM_S;
                goto exception_return;

        default:fatal("TODO: descriptor for vaddr 0x%08x: 0x%08x ("
                    "unimplemented type %i)\n", vaddr, d, d&3);
                exit(1);
        }

exception_return:
        if (no_exceptions)
                return 0;

        if (!quiet_mode) {
                fatal("{ arm memory fault: vaddr=0x%08x domain=%i dav=%i ap=%i "
                    "access=%i user=%i", (int)vaddr, domain, dav, ap,
                    access, user);
                fatal(" d=0x%08x d2=0x%08x }\n", d, d2);
        }

        if (instr)
                arm_exception(cpu, ARM_EXCEPTION_PREF_ABT);
        else {
                cpu->cd.arm.far = vaddr;
                cpu->cd.arm.fsr = (domain << 4) | fs;
                arm_exception(cpu, ARM_EXCEPTION_DATA_ABT);
        }

        return 0;
}

1	dpavlin	14	/*
2			* Copyright (C) 2005 Anders Gavare. All rights reserved.
3			*
4			* Redistribution and use in source and binary forms, with or without
5			* modification, are permitted provided that the following conditions are met:
6			*
7			* 1. Redistributions of source code must retain the above copyright
8			* notice, this list of conditions and the following disclaimer.
9			* 2. Redistributions in binary form must reproduce the above copyright
10			* notice, this list of conditions and the following disclaimer in the
11			* documentation and/or other materials provided with the distribution.
12			* 3. The name of the author may not be used to endorse or promote products
13			* derived from this software without specific prior written permission.
14			*
15			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25			* SUCH DAMAGE.
26			*
27			*
28	dpavlin	18	* $Id: memory_arm.c,v 1.27 2005/10/23 14:24:13 debug Exp $
29	dpavlin	14	*
30			*
31	dpavlin	18	* TODO/NOTE: The B and/or C bits could also cause the return value to
32			* be MEMORY_NOT_FULL_PAGE, to make sure it doesn't get entered into the
33			* translation arrays. TODO: Find out if this is a good thing to do.
34	dpavlin	14	*/
35
36			#include <stdio.h>
37			#include <stdlib.h>
38			#include <string.h>
39
40			#include "cpu.h"
41			#include "memory.h"
42			#include "misc.h"
43
44			#include "armreg.h"
45
46			extern int quiet_mode;
47
48
49			/*
50	dpavlin	18	* arm_translate_address():
51			*
52			* Address translation with the MMU disabled.
53			*/
54			int arm_translate_address(struct cpu *cpu, uint64_t vaddr64,
55			uint64_t *return_addr, int flags)
56			{
57			*return_addr = vaddr64 & 0xffffffff;
58			return 2;
59			}
60
61
62			/*
63	dpavlin	14	* arm_check_access():
64			*
65			* Helper function. Returns 0 for no access, 1 for read-only, and 2 for
66			* read/write.
67			*/
68			static int arm_check_access(struct cpu *cpu, int ap, int dav, int user)
69			{
70			int s, r;
71
72			switch (dav) {
73			case 0: /* No access at all. */
74			return 0;
75			case 1: /* Normal access check. */
76			break;
77			case 2: fatal("arm_check_access(): 1 shouldn't be used\n");
78			exit(1);
79			case 3: /* Anything is allowed. */
80			return 2;
81			}
82
83			switch (ap) {
84			case 0: s = (cpu->cd.arm.control & ARM_CONTROL_S)? 1 : 0;
85			r = (cpu->cd.arm.control & ARM_CONTROL_R)? 2 : 0;
86			switch (s + r) {
87			case 0: return 0;
88			case 1: return user? 0 : 1;
89			case 2: return 1;
90			}
91			fatal("arm_check_access: UNPREDICTABLE s+r value!\n");
92			return 0;
93			case 1: return user? 0 : 2;
94			case 2: return user? 1 : 2;
95			}
96
97			/* "case 3": */
98			return 2;
99			}
100
101
102			/*
103	dpavlin	18	* arm_translate_address_mmu():
104	dpavlin	14	*
105			* Don't call this function is userland_emul is non-NULL, or cpu is NULL.
106			*
107			* Return values:
108			* 0 Failure
109			* 1 Success, the page is readable only
110			* 2 Success, the page is read/write
111	dpavlin	18	*
112			* If this is a 1KB page access, then the return value is ORed with
113			* MEMORY_NOT_FULL_PAGE.
114	dpavlin	14	*/
115	dpavlin	18	int arm_translate_address_mmu(struct cpu *cpu, uint64_t vaddr64,
116	dpavlin	14	uint64_t *return_addr, int flags)
117			{
118	dpavlin	18	unsigned char *q;
119			uint32_t addr, d=0, d2 = (uint32_t)(int32_t)-1, ptba, vaddr = vaddr64;
120	dpavlin	14	int instr = flags & FLAG_INSTR;
121			int writeflag = (flags & FLAG_WRITEFLAG)? 1 : 0;
122			int useraccess = flags & MEMORY_USER_ACCESS;
123			int no_exceptions = flags & FLAG_NOEXCEPTIONS;
124			int user = (cpu->cd.arm.cpsr & ARM_FLAG_MODE) == ARM_MODE_USR32;
125			int domain, dav, ap0,ap1,ap2,ap3, ap = 0, access = 0;
126			int fs = 2; /* fault status (2 = terminal exception) */
127	dpavlin	18	int subpage = 0;
128	dpavlin	14
129			if (useraccess)
130			user = 1;
131
132	dpavlin	18	addr = ((vaddr & 0xfff00000ULL) >> 18);
133
134			if (cpu->cd.arm.translation_table == NULL \|\|
135			cpu->cd.arm.ttb != cpu->cd.arm.last_ttb) {
136			uint32_t ofs;
137			cpu->cd.arm.translation_table = memory_paddr_to_hostaddr(
138			cpu->mem, cpu->cd.arm.ttb & 0x0fffffff, 0);
139			if (cpu->cd.arm.translation_table != NULL) {
140			ofs = cpu->cd.arm.ttb & ((1 << BITS_PER_MEMBLOCK) - 1);
141			cpu->cd.arm.translation_table += ofs;
142			}
143			cpu->cd.arm.last_ttb = cpu->cd.arm.ttb;
144	dpavlin	14	}
145
146	dpavlin	18	if (cpu->cd.arm.translation_table != NULL) {
147			d = (uint32_t )(cpu->cd.arm.translation_table + addr);
148			#ifdef HOST_LITTLE_ENDIAN
149			if (cpu->byte_order == EMUL_BIG_ENDIAN)
150			#else
151			if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
152			#endif
153			d = ((d & 0xff) << 24) \| ((d & 0xff00) << 8) \|
154			((d & 0xff0000) >> 8) \| ((d & 0xff000000) >> 24);
155			}
156	dpavlin	14
157			/* Get the domain from the descriptor, and the Domain Access Value: */
158			domain = (d >> 5) & 15;
159			dav = (cpu->cd.arm.dacr >> (domain * 2)) & 3;
160
161			switch (d & 3) {
162
163	dpavlin	18	case 0: domain = 0;
164	dpavlin	14	fs = FAULT_TRANS_S;
165			goto exception_return;
166
167			case 1: /* Course Pagetable: */
168	dpavlin	18	if (dav == 0) {
169			fs = FAULT_DOMAIN_P;
170			goto exception_return;
171			}
172	dpavlin	14	ptba = d & 0xfffffc00;
173			addr = ptba + ((vaddr & 0x000ff000) >> 10);
174	dpavlin	18
175			q = memory_paddr_to_hostaddr(cpu->mem, addr & 0x0fffffff, 0);
176			if (q == NULL) {
177			printf("arm memory blah blah adfh asfg asdgasdg\n");
178	dpavlin	14	exit(1);
179			}
180	dpavlin	18	d2 = (uint32_t )(q + (addr & ((1 << BITS_PER_MEMBLOCK) - 1)));
181			#ifdef HOST_LITTLE_ENDIAN
182			if (cpu->byte_order == EMUL_BIG_ENDIAN)
183			#else
184	dpavlin	14	if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
185	dpavlin	18	#endif
186			d2 = ((d2 & 0xff) << 24) \| ((d2 & 0xff00) << 8) \|
187			((d2 & 0xff0000) >> 8) \| ((d2 & 0xff000000) >> 24);
188	dpavlin	14
189			switch (d2 & 3) {
190			case 0: fs = FAULT_TRANS_P;
191			goto exception_return;
192			case 1: /* 16KB page: */
193			ap = (d2 >> 4) & 255;
194			switch (vaddr & 0x0000c000) {
195			case 0x4000: ap >>= 2; break;
196			case 0x8000: ap >>= 4; break;
197			case 0xc000: ap >>= 6; break;
198			}
199			ap &= 3;
200			*return_addr = (d2 & 0xffff0000) \| (vaddr & 0x0000ffff);
201			break;
202			case 2: /* 4KB page: */
203			ap3 = (d2 >> 10) & 3;
204			ap2 = (d2 >> 8) & 3;
205			ap1 = (d2 >> 6) & 3;
206			ap0 = (d2 >> 4) & 3;
207			switch (vaddr & 0x00000c00) {
208			case 0x000: ap = ap0; break;
209			case 0x400: ap = ap1; break;
210			case 0x800: ap = ap2; break;
211			default: ap = ap3;
212			}
213	dpavlin	18	if (ap0 != ap1 \|\| ap0 != ap2 \|\| ap0 != ap3)
214			subpage = 1;
215	dpavlin	14	*return_addr = (d2 & 0xfffff000) \| (vaddr & 0x00000fff);
216			break;
217			case 3: /* 1KB page: */
218	dpavlin	18	subpage = 1;
219	dpavlin	14	ap = (d2 >> 4) & 3;
220			*return_addr = (d2 & 0xfffffc00) \| (vaddr & 0x000003ff);
221			break;
222			}
223			access = arm_check_access(cpu, ap, dav, user);
224			if (access > writeflag)
225	dpavlin	18	return access \| (subpage? MEMORY_NOT_FULL_PAGE : 0);
226	dpavlin	14	fs = FAULT_PERM_P;
227			goto exception_return;
228
229			case 2: /* Section descriptor: */
230			if (dav == 0) {
231			fs = FAULT_DOMAIN_S;
232			goto exception_return;
233			}
234	dpavlin	18	*return_addr = (d & 0xfff00000) \| (vaddr & 0x000fffff);
235	dpavlin	14	ap = (d >> 10) & 3;
236			access = arm_check_access(cpu, ap, dav, user);
237			if (access > writeflag)
238			return access;
239			fs = FAULT_PERM_S;
240			goto exception_return;
241
242			default:fatal("TODO: descriptor for vaddr 0x%08x: 0x%08x ("
243			"unimplemented type %i)\n", vaddr, d, d&3);
244			exit(1);
245			}
246
247			exception_return:
248			if (no_exceptions)
249			return 0;
250
251			if (!quiet_mode) {
252			fatal("{ arm memory fault: vaddr=0x%08x domain=%i dav=%i ap=%i "
253			"access=%i user=%i", (int)vaddr, domain, dav, ap,
254			access, user);
255	dpavlin	18	fatal(" d=0x%08x d2=0x%08x }\n", d, d2);
256	dpavlin	14	}
257
258			if (instr)
259			arm_exception(cpu, ARM_EXCEPTION_PREF_ABT);
260			else {
261			cpu->cd.arm.far = vaddr;
262			cpu->cd.arm.fsr = (domain << 4) \| fs;
263			arm_exception(cpu, ARM_EXCEPTION_DATA_ABT);
264			}
265
266			return 0;
267			}
268