0.3.2/src/symbol.c

/*
 *  Copyright (C) 2003-2005  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: symbol.c,v 1.24 2005/04/10 16:42:56 debug Exp $
 *
 *  Address to symbol translation routines.
 *
 *  This module is (probably) independant from the rest of the emulator.
 *  symbol_init() must be called before any other function in this
 *  file is used.
 */

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

#include "misc.h"

#include "symbol.h"


#define SYMBOLBUF_MAX   100


/*
 *  symbol_nsymbols():
 *
 *  Return n_symbols.
 */
int symbol_nsymbols(struct symbol_context *sc)
{
        return sc->n_symbols;
}


/*
 *  get_symbol_addr():
 *
 *  Find a symbol by name. If addr is non-NULL, *addr is set to the symbol's
 *  address. Return value is 1 if the symbol is found, 0 otherwise.
 *
 *  NOTE:  This is O(n).
 */
int get_symbol_addr(struct symbol_context *sc, char *symbol, uint64_t *addr)
{
        struct symbol *s;

        if (sc->sorted_array) {
                int i;
                for (i=0; i<sc->n_symbols; i++)
                        if (strcmp(symbol, sc->first_symbol[i].name) == 0) {
                                if (addr != NULL)
                                        *addr = sc->first_symbol[i].addr;
                                return 1;
                        }
        } else {
                s = sc->first_symbol;
                while (s != NULL) {
                        if (strcmp(symbol, s->name) == 0) {
                                if (addr != NULL)
                                        *addr = s->addr;
                                return 1;
                        }
                        s = s->next;
                }
        }

        return 0;
}


/*
 *  get_symbol_name():
 *
 *  Translate an address into a symbol name.  The return value is a pointer
 *  to a static char array, containing the symbol name.  (In other words,
 *  this function is not reentrant. This removes the need for memory allocation
 *  at the caller's side.)
 *
 *  If offset is not a NULL pointer, *offset is set to the offset within
 *  the symbol. For example, if there is a symbol at address 0x1000 with
 *  length 0x100, and a caller wants to know the symbol name of address
 *  0x1008, the symbol's name will be found in the static char array, and
 *  *offset will be set to 0x8.
 *
 *  If no symbol was found, NULL is returned instead.
 */
static char symbol_buf[SYMBOLBUF_MAX+1];
char *get_symbol_name(struct symbol_context *sc, uint64_t addr,
        uint64_t *offset)
{
        struct symbol *s;
        int stepsize, ofs;

        if (sc->n_symbols == 0)
                return NULL;

        if ((addr >> 32) == 0 && (addr & 0x80000000ULL))
                addr |= 0xffffffff00000000ULL;

        symbol_buf[0] = symbol_buf[SYMBOLBUF_MAX] = '\0';
        if (offset != NULL)
                *offset = 0;

        if (!sc->sorted_array) {
                /*  Slow, linear O(n) search:  */
                s = sc->first_symbol;
                while (s != NULL) {
                        /*  Found a match?  */
                        if (addr >= s->addr && addr < s->addr + s->len) {
                                if (addr == s->addr)
                                        snprintf(symbol_buf, SYMBOLBUF_MAX,
                                            "%s", s->name);
                                else
                                        snprintf(symbol_buf, SYMBOLBUF_MAX,
                                            "%s+0x%lx", s->name, (long)
                                            (addr - s->addr));
                                if (offset != NULL)
                                        *offset = addr - s->addr;
                                return symbol_buf;
                        }
                        s = s->next;
                }
        } else {
                /*  Faster, O(log n) search:  */
                stepsize = sc->n_symbols / 2;
                ofs = stepsize;
                while (stepsize > 0 || (stepsize == 0 && ofs == 0)) {
                        s = sc->first_symbol + ofs;

                        /*  Found a match?  */
                        if (addr >= s->addr && addr < s->addr + s->len) {
                                if (addr == s->addr)
                                        snprintf(symbol_buf, SYMBOLBUF_MAX,
                                            "%s", s->name);
                                else
                                        snprintf(symbol_buf, SYMBOLBUF_MAX,
                                            "%s+0x%lx", s->name, (long)
                                            (addr - s->addr));
                                if (offset != NULL)
                                        *offset = addr - s->addr;
                                return symbol_buf;
                        }

                        if (ofs == 0)
                                break;

                        stepsize >>= 1;

                        /*  Special case for offset 0 (end of search in
                            the Left direction  */
                        if (stepsize == 0)
                                ofs = 0;
                        else {
                                if (addr < s->addr)
                                        ofs -= stepsize;
                                else
                                        ofs += stepsize;
                        }
                }
        }

        /*  Not found? Then return NULL.  */
        return NULL;
}


/*
 *  add_symbol_name():
 *
 *  Add a symbol to the symbol list.
 */
void add_symbol_name(struct symbol_context *sc,
        uint64_t addr, uint64_t len, char *name, int type)
{
        struct symbol *s;

        if (sc->sorted_array) {
                fprintf(stderr, "add_symbol_name(): Internal error: the "
                    "symbol array is already sorted\n");
                exit(1);
        }

        if (name == NULL) {
                fprintf(stderr, "add_symbol_name(): name = NULL\n");
                exit(1);
        }

        /*  TODO: Maybe this should be optional?  */
        if (name[0] == '$')
                return;

        if ((addr >> 32) == 0 && (addr & 0x80000000ULL))
                addr |= 0xffffffff00000000ULL;

        s = malloc(sizeof(struct symbol));
        if (s == NULL) {
                fprintf(stderr, "out of memory\n");
                exit(1);
        }

        s->name = strdup(name);
        if (s->name == NULL) {
                fprintf(stderr, "out of memory\n");
                exit(1);
        }
        s->addr = addr;
        s->len  = len;
        s->type = type;

        sc->n_symbols ++;

        /*  Add first in list:  */
        s->next = sc->first_symbol;
        sc->first_symbol = s;
}


/*
 *  symbol_readfile():
 *
 *  Read 'nm -S' style symbols from a file.
 *
 *  TODO: This function is an ugly hack, and should be replaced
 *  with something that reads symbols directly from the executable
 *  images.
 */
void symbol_readfile(struct symbol_context *sc, char *fname)
{
        FILE *f;
        char b1[80]; uint64_t addr;
        char b2[80]; uint64_t len;
        char b3[80]; int type;
        char b4[80];
        int cur_n_symbols = sc->n_symbols;

        f = fopen(fname, "r");
        if (f == NULL) {
                perror(fname);
                exit(1);
        }

        while (!feof(f)) {
                memset(b1, 0, sizeof(b1));
                memset(b2, 0, sizeof(b2));
                memset(b3, 0, sizeof(b3));
                memset(b4, 0, sizeof(b4));
                fscanf(f, "%s %s\n", b1,b2);
                if (strlen(b2) < 2 && !(b2[0]>='0' && b2[0]<='9')) {
                        strcpy(b3, b2);
                        strcpy(b2, "0");
                        fscanf(f, "%s\n", b4);
                } else {
                        fscanf(f, "%s %s\n", b3,b4);
                }

                /*  printf("b1='%s' b2='%s' b3='%s' b4='%s'\n",
                    b1,b2,b3,b4);  */
                addr = strtoull(b1, NULL, 16);
                len  = strtoull(b2, NULL, 16);
                type = b3[0];
                /*  printf("addr=%016llx len=%016llx type=%i\n",
                    addr, len, type);  */

                if (type == 't' || type == 'r' || type == 'g')
                        continue;

                add_symbol_name(sc, addr, len, b4, type);
        }

        fclose(f);

        debug("%i symbols\n", sc->n_symbols - cur_n_symbols);
}


/*
 *  sym_addr_compare():
 *
 *  Helper function for sorting symbols according to their address.
 */
int sym_addr_compare(const void *a, const void *b)
{
        struct symbol *p1 = (struct symbol *) a;
        struct symbol *p2 = (struct symbol *) b;

        if (p1->addr < p2->addr)
                return -1;
        if (p1->addr > p2->addr)
                return 1;

        return 0;
}


/*
 *  symbol_recalc_sizes():
 *
 *  Recalculate sizes of symbols that have size = 0, by creating an array
 *  containing all symbols, qsort()-ing that array according to address, and
 *  recalculating the size fields if necessary.
 */
void symbol_recalc_sizes(struct symbol_context *sc)
{
        struct symbol *tmp_array;
        struct symbol *last_ptr;
        struct symbol *tmp_ptr;
        int i;

        tmp_array = malloc(sizeof (struct symbol) * sc->n_symbols);
        if (tmp_array == NULL) {
                fprintf(stderr, "out of memory\n");
                exit(1);
        }

        /*  Copy first_symbol --> tmp_array, and remove the old
                first_symbol at the same time:  */
        tmp_ptr = sc->first_symbol;
        i = 0;
        while (tmp_ptr != NULL) {
                tmp_array[i] = *tmp_ptr;
                last_ptr = tmp_ptr;
                tmp_ptr = tmp_ptr->next;
                free(last_ptr);
                i++;
        }

        qsort(tmp_array, sc->n_symbols, sizeof(struct symbol),
            sym_addr_compare);
        sc->sorted_array = 1;

        /*  Recreate the first_symbol chain:  */
        sc->first_symbol = NULL;
        for (i=0; i<sc->n_symbols; i++) {
                /*  Recalculate size, if 0:  */
                if (tmp_array[i].len == 0) {
                        uint64_t len;
                        if (i != sc->n_symbols-1)
                                len = tmp_array[i+1].addr
                                    - tmp_array[i].addr;
                        else
                                len = 1;
                        tmp_array[i].len = len;
                }

                tmp_array[i].next = &tmp_array[i+1];
        }

        sc->first_symbol = tmp_array;
}


/*
 *  symbol_init():
 *
 *  Initialize the symbol hashtables.
 */
void symbol_init(struct symbol_context *sc)
{
        sc->first_symbol = NULL;
        sc->sorted_array = 0;
        sc->n_symbols = 0;
}

1	dpavlin	2	/*
2			* Copyright (C) 2003-2005 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	4	* $Id: symbol.c,v 1.24 2005/04/10 16:42:56 debug Exp $
29	dpavlin	2	*
30			* Address to symbol translation routines.
31			*
32			* This module is (probably) independant from the rest of the emulator.
33			* symbol_init() must be called before any other function in this
34			* file is used.
35			*/
36
37			#include <stdio.h>
38			#include <stdlib.h>
39			#include <string.h>
40
41			#include "misc.h"
42
43			#include "symbol.h"
44
45
46			#define SYMBOLBUF_MAX 100
47
48
49			/*
50			* symbol_nsymbols():
51			*
52			* Return n_symbols.
53			*/
54			int symbol_nsymbols(struct symbol_context *sc)
55			{
56			return sc->n_symbols;
57			}
58
59
60			/*
61			* get_symbol_addr():
62			*
63			* Find a symbol by name. If addr is non-NULL, *addr is set to the symbol's
64			* address. Return value is 1 if the symbol is found, 0 otherwise.
65			*
66			* NOTE: This is O(n).
67			*/
68			int get_symbol_addr(struct symbol_context sc, char symbol, uint64_t *addr)
69			{
70			struct symbol *s;
71
72			if (sc->sorted_array) {
73			int i;
74			for (i=0; i<sc->n_symbols; i++)
75			if (strcmp(symbol, sc->first_symbol[i].name) == 0) {
76			if (addr != NULL)
77			*addr = sc->first_symbol[i].addr;
78			return 1;
79			}
80			} else {
81			s = sc->first_symbol;
82			while (s != NULL) {
83			if (strcmp(symbol, s->name) == 0) {
84			if (addr != NULL)
85			*addr = s->addr;
86			return 1;
87			}
88			s = s->next;
89			}
90			}
91
92			return 0;
93			}
94
95
96			/*
97			* get_symbol_name():
98			*
99			* Translate an address into a symbol name. The return value is a pointer
100			* to a static char array, containing the symbol name. (In other words,
101			* this function is not reentrant. This removes the need for memory allocation
102			* at the caller's side.)
103			*
104			* If offset is not a NULL pointer, *offset is set to the offset within
105			* the symbol. For example, if there is a symbol at address 0x1000 with
106			* length 0x100, and a caller wants to know the symbol name of address
107			* 0x1008, the symbol's name will be found in the static char array, and
108			* *offset will be set to 0x8.
109			*
110			* If no symbol was found, NULL is returned instead.
111			*/
112			static char symbol_buf[SYMBOLBUF_MAX+1];
113			char get_symbol_name(struct symbol_context sc, uint64_t addr,
114			uint64_t *offset)
115			{
116			struct symbol *s;
117			int stepsize, ofs;
118
119			if (sc->n_symbols == 0)
120			return NULL;
121
122			if ((addr >> 32) == 0 && (addr & 0x80000000ULL))
123			addr \|= 0xffffffff00000000ULL;
124
125			symbol_buf[0] = symbol_buf[SYMBOLBUF_MAX] = '\0';
126			if (offset != NULL)
127			*offset = 0;
128
129			if (!sc->sorted_array) {
130			/* Slow, linear O(n) search: */
131			s = sc->first_symbol;
132			while (s != NULL) {
133			/* Found a match? */
134			if (addr >= s->addr && addr < s->addr + s->len) {
135			if (addr == s->addr)
136			snprintf(symbol_buf, SYMBOLBUF_MAX,
137			"%s", s->name);
138			else
139			snprintf(symbol_buf, SYMBOLBUF_MAX,
140			"%s+0x%lx", s->name, (long)
141			(addr - s->addr));
142			if (offset != NULL)
143			*offset = addr - s->addr;
144			return symbol_buf;
145			}
146			s = s->next;
147			}
148			} else {
149			/* Faster, O(log n) search: */
150			stepsize = sc->n_symbols / 2;
151			ofs = stepsize;
152			while (stepsize > 0 \|\| (stepsize == 0 && ofs == 0)) {
153			s = sc->first_symbol + ofs;
154
155			/* Found a match? */
156			if (addr >= s->addr && addr < s->addr + s->len) {
157			if (addr == s->addr)
158			snprintf(symbol_buf, SYMBOLBUF_MAX,
159			"%s", s->name);
160			else
161			snprintf(symbol_buf, SYMBOLBUF_MAX,
162			"%s+0x%lx", s->name, (long)
163			(addr - s->addr));
164			if (offset != NULL)
165			*offset = addr - s->addr;
166			return symbol_buf;
167			}
168
169			if (ofs == 0)
170			break;
171
172			stepsize >>= 1;
173
174			/* Special case for offset 0 (end of search in
175			the Left direction */
176			if (stepsize == 0)
177			ofs = 0;
178			else {
179			if (addr < s->addr)
180			ofs -= stepsize;
181			else
182			ofs += stepsize;
183			}
184			}
185			}
186
187			/* Not found? Then return NULL. */
188			return NULL;
189			}
190
191
192			/*
193			* add_symbol_name():
194			*
195			* Add a symbol to the symbol list.
196			*/
197			void add_symbol_name(struct symbol_context *sc,
198			uint64_t addr, uint64_t len, char *name, int type)
199			{
200			struct symbol *s;
201
202			if (sc->sorted_array) {
203			fprintf(stderr, "add_symbol_name(): Internal error: the "
204			"symbol array is already sorted\n");
205			exit(1);
206			}
207
208	dpavlin	4	if (name == NULL) {
209			fprintf(stderr, "add_symbol_name(): name = NULL\n");
210			exit(1);
211			}
212
213			/* TODO: Maybe this should be optional? */
214			if (name[0] == '$')
215			return;
216
217	dpavlin	2	if ((addr >> 32) == 0 && (addr & 0x80000000ULL))
218			addr \|= 0xffffffff00000000ULL;
219
220			s = malloc(sizeof(struct symbol));
221			if (s == NULL) {
222			fprintf(stderr, "out of memory\n");
223			exit(1);
224			}
225
226			s->name = strdup(name);
227			if (s->name == NULL) {
228			fprintf(stderr, "out of memory\n");
229			exit(1);
230			}
231			s->addr = addr;
232			s->len = len;
233			s->type = type;
234
235			sc->n_symbols ++;
236
237			/* Add first in list: */
238			s->next = sc->first_symbol;
239			sc->first_symbol = s;
240			}
241
242
243			/*
244			* symbol_readfile():
245			*
246			* Read 'nm -S' style symbols from a file.
247			*
248			* TODO: This function is an ugly hack, and should be replaced
249			* with something that reads symbols directly from the executable
250			* images.
251			*/
252			void symbol_readfile(struct symbol_context sc, char fname)
253			{
254			FILE *f;
255			char b1[80]; uint64_t addr;
256			char b2[80]; uint64_t len;
257			char b3[80]; int type;
258			char b4[80];
259			int cur_n_symbols = sc->n_symbols;
260
261			f = fopen(fname, "r");
262			if (f == NULL) {
263			perror(fname);
264			exit(1);
265			}
266
267			while (!feof(f)) {
268			memset(b1, 0, sizeof(b1));
269			memset(b2, 0, sizeof(b2));
270			memset(b3, 0, sizeof(b3));
271			memset(b4, 0, sizeof(b4));
272			fscanf(f, "%s %s\n", b1,b2);
273			if (strlen(b2) < 2 && !(b2[0]>='0' && b2[0]<='9')) {
274			strcpy(b3, b2);
275			strcpy(b2, "0");
276			fscanf(f, "%s\n", b4);
277			} else {
278			fscanf(f, "%s %s\n", b3,b4);
279			}
280
281			/* printf("b1='%s' b2='%s' b3='%s' b4='%s'\n",
282			b1,b2,b3,b4); */
283			addr = strtoull(b1, NULL, 16);
284			len = strtoull(b2, NULL, 16);
285			type = b3[0];
286			/* printf("addr=%016llx len=%016llx type=%i\n",
287			addr, len, type); */
288
289			if (type == 't' \|\| type == 'r' \|\| type == 'g')
290			continue;
291
292			add_symbol_name(sc, addr, len, b4, type);
293			}
294
295			fclose(f);
296
297			debug("%i symbols\n", sc->n_symbols - cur_n_symbols);
298			}
299
300
301			/*
302			* sym_addr_compare():
303			*
304			* Helper function for sorting symbols according to their address.
305			*/
306			int sym_addr_compare(const void a, const void b)
307			{
308			struct symbol p1 = (struct symbol ) a;
309			struct symbol p2 = (struct symbol ) b;
310
311			if (p1->addr < p2->addr)
312			return -1;
313			if (p1->addr > p2->addr)
314			return 1;
315
316			return 0;
317			}
318
319
320			/*
321			* symbol_recalc_sizes():
322			*
323			* Recalculate sizes of symbols that have size = 0, by creating an array
324			* containing all symbols, qsort()-ing that array according to address, and
325			* recalculating the size fields if necessary.
326			*/
327			void symbol_recalc_sizes(struct symbol_context *sc)
328			{
329			struct symbol *tmp_array;
330			struct symbol *last_ptr;
331			struct symbol *tmp_ptr;
332			int i;
333
334			tmp_array = malloc(sizeof (struct symbol) * sc->n_symbols);
335			if (tmp_array == NULL) {
336			fprintf(stderr, "out of memory\n");
337			exit(1);
338			}
339
340			/* Copy first_symbol --> tmp_array, and remove the old
341			first_symbol at the same time: */
342			tmp_ptr = sc->first_symbol;
343			i = 0;
344			while (tmp_ptr != NULL) {
345			tmp_array[i] = *tmp_ptr;
346			last_ptr = tmp_ptr;
347			tmp_ptr = tmp_ptr->next;
348			free(last_ptr);
349			i++;
350			}
351
352			qsort(tmp_array, sc->n_symbols, sizeof(struct symbol),
353			sym_addr_compare);
354			sc->sorted_array = 1;
355
356			/* Recreate the first_symbol chain: */
357			sc->first_symbol = NULL;
358			for (i=0; i<sc->n_symbols; i++) {
359			/* Recalculate size, if 0: */
360			if (tmp_array[i].len == 0) {
361			uint64_t len;
362			if (i != sc->n_symbols-1)
363			len = tmp_array[i+1].addr
364			- tmp_array[i].addr;
365			else
366			len = 1;
367			tmp_array[i].len = len;
368			}
369
370			tmp_array[i].next = &tmp_array[i+1];
371			}
372
373			sc->first_symbol = tmp_array;
374			}
375
376
377			/*
378			* symbol_init():
379			*
380			* Initialize the symbol hashtables.
381			*/
382			void symbol_init(struct symbol_context *sc)
383			{
384			sc->first_symbol = NULL;
385			sc->sorted_array = 0;
386			sc->n_symbols = 0;
387			}
388