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db_access.c
(2.43 KB)
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db_access.h
(1.37 KB)
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db_break.c
(7.28 KB)
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db_break.h
(2.03 KB)
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db_capture.c
(10.17 KB)
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db_command.c
(21.03 KB)
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db_command.h
(1.7 KB)
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db_examine.c
(7.2 KB)
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db_expr.c
(7.91 KB)
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db_input.c
(8.11 KB)
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db_lex.c
(7.2 KB)
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db_lex.h
(3.28 KB)
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db_main.c
(7.1 KB)
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db_output.c
(8.03 KB)
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db_output.h
(1.39 KB)
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db_print.c
(2.58 KB)
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db_ps.c
(13.33 KB)
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db_run.c
(9.74 KB)
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db_script.c
(15.49 KB)
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db_sym.c
(10.72 KB)
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db_sym.h
(3.49 KB)
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db_textdump.c
(16.53 KB)
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db_thread.c
(4.22 KB)
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db_variables.c
(3.67 KB)
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db_variables.h
(2.01 KB)
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db_watch.c
(6.71 KB)
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db_watch.h
(1.45 KB)
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db_write_cmd.c
(2.12 KB)
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ddb.h
(10.09 KB)
Editing: db_sym.c
/*- * SPDX-License-Identifier: MIT-CMU * * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ /* * Author: David B. Golub, Carnegie Mellon University * Date: 7/90 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "opt_kstack_pages.h" #include <sys/param.h> #include <sys/pcpu.h> #include <sys/smp.h> #include <sys/systm.h> #include <net/vnet.h> #include <ddb/ddb.h> #include <ddb/db_sym.h> #include <ddb/db_variables.h> #include "opt_ddb.h" /* * Multiple symbol tables */ #ifndef MAXNOSYMTABS #define MAXNOSYMTABS 3 /* mach, ux, emulator */ #endif static db_symtab_t db_symtabs[MAXNOSYMTABS] = {{0,},}; static int db_nsymtab = 0; static db_symtab_t *db_last_symtab; /* where last symbol was found */ static c_db_sym_t db_lookup( const char *symstr); static char *db_qualify(c_db_sym_t sym, char *symtabname); static bool db_symbol_is_ambiguous(c_db_sym_t sym); static bool db_line_at_pc(c_db_sym_t, char **, int *, db_expr_t); static int db_cpu = -1; #ifdef VIMAGE static void *db_vnet = NULL; #endif /* * Validate the CPU number used to interpret per-CPU variables so we can * avoid later confusion if an invalid CPU is requested. */ int db_var_db_cpu(struct db_variable *vp, db_expr_t *valuep, int op) { switch (op) { case DB_VAR_GET: *valuep = db_cpu; return (1); case DB_VAR_SET: if (*(int *)valuep < -1 || *(int *)valuep > mp_maxid) { db_printf("Invalid value: %d\n", *(int*)valuep); return (0); } db_cpu = *(int *)valuep; return (1); default: db_printf("db_var_db_cpu: unknown operation\n"); return (0); } } /* * Read-only variable reporting the current CPU, which is what we use when * db_cpu is set to -1. */ int db_var_curcpu(struct db_variable *vp, db_expr_t *valuep, int op) { switch (op) { case DB_VAR_GET: *valuep = curcpu; return (1); case DB_VAR_SET: db_printf("Read-only variable.\n"); return (0); default: db_printf("db_var_curcpu: unknown operation\n"); return (0); } } #ifdef VIMAGE /* * Validate the virtual network pointer used to interpret per-vnet global * variable expansion. Right now we don't do much here, really we should * walk the global vnet list to check it's an OK pointer. */ int db_var_db_vnet(struct db_variable *vp, db_expr_t *valuep, int op) { switch (op) { case DB_VAR_GET: *valuep = (db_expr_t)db_vnet; return (1); case DB_VAR_SET: db_vnet = *(void **)valuep; return (1); default: db_printf("db_var_db_vnet: unknown operation\n"); return (0); } } /* * Read-only variable reporting the current vnet, which is what we use when * db_vnet is set to NULL. */ int db_var_curvnet(struct db_variable *vp, db_expr_t *valuep, int op) { switch (op) { case DB_VAR_GET: *valuep = (db_expr_t)curvnet; return (1); case DB_VAR_SET: db_printf("Read-only variable.\n"); return (0); default: db_printf("db_var_curvnet: unknown operation\n"); return (0); } } #endif /* * Add symbol table, with given name, to list of symbol tables. */ void db_add_symbol_table(char *start, char *end, char *name, char *ref) { if (db_nsymtab >= MAXNOSYMTABS) { printf ("No slots left for %s symbol table", name); panic ("db_sym.c: db_add_symbol_table"); } db_symtabs[db_nsymtab].start = start; db_symtabs[db_nsymtab].end = end; db_symtabs[db_nsymtab].name = name; db_symtabs[db_nsymtab].private = ref; db_nsymtab++; } /* * db_qualify("vm_map", "ux") returns "unix:vm_map". * * Note: return value points to static data whose content is * overwritten by each call... but in practice this seems okay. */ static char * db_qualify(c_db_sym_t sym, char *symtabname) { const char *symname; static char tmp[256]; db_symbol_values(sym, &symname, 0); snprintf(tmp, sizeof(tmp), "%s:%s", symtabname, symname); return tmp; } bool db_eqname(const char *src, const char *dst, int c) { if (!strcmp(src, dst)) return (true); if (src[0] == c) return (!strcmp(src+1,dst)); return (false); } bool db_value_of_name(const char *name, db_expr_t *valuep) { c_db_sym_t sym; sym = db_lookup(name); if (sym == C_DB_SYM_NULL) return (false); db_symbol_values(sym, &name, valuep); return (true); } bool db_value_of_name_pcpu(const char *name, db_expr_t *valuep) { static char tmp[256]; db_expr_t value; c_db_sym_t sym; int cpu; if (db_cpu != -1) cpu = db_cpu; else cpu = curcpu; snprintf(tmp, sizeof(tmp), "pcpu_entry_%s", name); sym = db_lookup(tmp); if (sym == C_DB_SYM_NULL) return (false); db_symbol_values(sym, &name, &value); if (value < DPCPU_START || value >= DPCPU_STOP) return (false); *valuep = (db_expr_t)((uintptr_t)value + dpcpu_off[cpu]); return (true); } bool db_value_of_name_vnet(const char *name, db_expr_t *valuep) { #ifdef VIMAGE static char tmp[256]; db_expr_t value; c_db_sym_t sym; struct vnet *vnet; if (db_vnet != NULL) vnet = db_vnet; else vnet = curvnet; snprintf(tmp, sizeof(tmp), "vnet_entry_%s", name); sym = db_lookup(tmp); if (sym == C_DB_SYM_NULL) return (false); db_symbol_values(sym, &name, &value); if (value < VNET_START || value >= VNET_STOP) return (false); *valuep = (db_expr_t)((uintptr_t)value + vnet->vnet_data_base); return (true); #else return (false); #endif } /* * Lookup a symbol. * If the symbol has a qualifier (e.g., ux:vm_map), * then only the specified symbol table will be searched; * otherwise, all symbol tables will be searched. */ static c_db_sym_t db_lookup(const char *symstr) { c_db_sym_t sp; int i; int symtab_start = 0; int symtab_end = db_nsymtab; const char *cp; /* * Look for, remove, and remember any symbol table specifier. */ for (cp = symstr; *cp; cp++) { if (*cp == ':') { for (i = 0; i < db_nsymtab; i++) { int n = strlen(db_symtabs[i].name); if ( n == (cp - symstr) && strncmp(symstr, db_symtabs[i].name, n) == 0 ) { symtab_start = i; symtab_end = i + 1; break; } } if (i == db_nsymtab) { db_error("invalid symbol table name"); } symstr = cp+1; } } /* * Look in the specified set of symbol tables. * Return on first match. */ for (i = symtab_start; i < symtab_end; i++) { sp = X_db_lookup(&db_symtabs[i], symstr); if (sp) { db_last_symtab = &db_symtabs[i]; return sp; } } return 0; } /* * If true, check across symbol tables for multiple occurrences * of a name. Might slow things down quite a bit. */ static volatile bool db_qualify_ambiguous_names = false; /* * Does this symbol name appear in more than one symbol table? * Used by db_symbol_values to decide whether to qualify a symbol. */ static bool db_symbol_is_ambiguous(c_db_sym_t sym) { const char *sym_name; int i; bool found_once = false; if (!db_qualify_ambiguous_names) return (false); db_symbol_values(sym, &sym_name, 0); for (i = 0; i < db_nsymtab; i++) { if (X_db_lookup(&db_symtabs[i], sym_name)) { if (found_once) return (true); found_once = true; } } return (false); } /* * Find the closest symbol to val, and return its name * and the difference between val and the symbol found. */ c_db_sym_t db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp) { unsigned int diff; size_t newdiff; int i; c_db_sym_t ret, sym; /* * The kernel will never map the first page, so any symbols in that * range cannot refer to addresses. Some third-party assembly files * define internal constants which appear in their symbol table. * Avoiding the lookup for those symbols avoids replacing small offsets * with those symbols during disassembly. */ if (val < PAGE_SIZE) { *offp = 0; return (C_DB_SYM_NULL); } ret = C_DB_SYM_NULL; newdiff = diff = val; for (i = 0; i < db_nsymtab; i++) { sym = X_db_search_symbol(&db_symtabs[i], val, strategy, &newdiff); if ((uintmax_t)newdiff < (uintmax_t)diff) { db_last_symtab = &db_symtabs[i]; diff = newdiff; ret = sym; } } *offp = diff; return ret; } /* * Return name and value of a symbol */ void db_symbol_values(c_db_sym_t sym, const char **namep, db_expr_t *valuep) { db_expr_t value; if (sym == DB_SYM_NULL) { *namep = NULL; return; } X_db_symbol_values(db_last_symtab, sym, namep, &value); if (db_symbol_is_ambiguous(sym)) *namep = db_qualify(sym, db_last_symtab->name); if (valuep) *valuep = value; } /* * Print a the closest symbol to value * * After matching the symbol according to the given strategy * we print it in the name+offset format, provided the symbol's * value is close enough (eg smaller than db_maxoff). * We also attempt to print [filename:linenum] when applicable * (eg for procedure names). * * If we could not find a reasonable name+offset representation, * then we just print the value in hex. Small values might get * bogus symbol associations, e.g. 3 might get some absolute * value like _INCLUDE_VERSION or something, therefore we do * not accept symbols whose value is "small" (and use plain hex). */ db_expr_t db_maxoff = 0x10000; void db_printsym(db_expr_t off, db_strategy_t strategy) { db_expr_t d; char *filename; const char *name; int linenum; c_db_sym_t cursym; if (off < 0 && off >= -db_maxoff) { db_printf("%+#lr", (long)off); return; } cursym = db_search_symbol(off, strategy, &d); db_symbol_values(cursym, &name, NULL); if (name == NULL || d >= (db_addr_t)db_maxoff) { db_printf("%#lr", (unsigned long)off); return; } #ifdef DDB_NUMSYM db_printf("%#lr = %s", (unsigned long)off, name); #else db_printf("%s", name); #endif if (d) db_printf("+%+#lr", (long)d); if (strategy == DB_STGY_PROC) { if (db_line_at_pc(cursym, &filename, &linenum, off)) db_printf(" [%s:%d]", filename, linenum); } } static bool db_line_at_pc(c_db_sym_t sym, char **filename, int *linenum, db_expr_t pc) { return (X_db_line_at_pc(db_last_symtab, sym, filename, linenum, pc)); } bool db_sym_numargs(c_db_sym_t sym, int *nargp, char **argnames) { return (X_db_sym_numargs(db_last_symtab, sym, nargp, argnames)); }
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