diff --git a/sys/ddb/db_elf.c b/sys/ddb/db_elf.c new file mode 100644 index 000000000000..c887aa8785a5 --- /dev/null +++ b/sys/ddb/db_elf.c @@ -0,0 +1,402 @@ +/* $Id$ */ +/* $NetBSD: db_elf.c,v 1.4 1998/05/03 18:49:54 thorpej Exp $ */ + +/*- + * Copyright (c) 1997 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, + * NASA Ames Research Center. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. + */ + +#include "opt_ddb.h" + +#include +#include +#include +#include + +#include + +#include +#include + +#ifdef DB_ELF_SYMBOLS + +#ifndef DB_ELFSIZE +#error Must define DB_ELFSIZE! +#endif + +#define ELFSIZE DB_ELFSIZE + +#include + +#define CONCAT(x,y) __CONCAT(x,y) +#define ELFDEFNAME(x) CONCAT(Elf,CONCAT(ELFSIZE,CONCAT(_,x))) + +static char *db_elf_find_strtab __P((db_symtab_t *)); + +#define STAB_TO_SYMSTART(stab) ((Elf_Sym *)((stab)->start)) +#define STAB_TO_SYMEND(stab) ((Elf_Sym *)((stab)->end)) +#define STAB_TO_EHDR(stab) ((Elf_Ehdr *)((stab)->private)) +#define STAB_TO_SHDR(stab, e) ((Elf_Shdr *)((stab)->private + (e)->e_shoff)) + +#define Elf_Ehdr ELFDEFNAME(Ehdr) +#define Elf_Shdr ELFDEFNAME(Shdr) +#define Elf_Sym ELFDEFNAME(Sym) + +#if ELFSIZE == 64 +#define ELF_ST_TYPE(x) ELF64_ST_TYPE(x) +#define ELF_ST_BIND(x) ELF64_ST_BIND(x) +#else +#define ELF_ST_TYPE(x) ELF32_ST_TYPE(x) +#define ELF_ST_BIND(x) ELF32_ST_BIND(x) +#endif + +void X_db_sym_init(void *symtab, void *esymtab, char *name); + +/* + * Find the symbol table and strings; tell ddb about them. + */ +void +X_db_sym_init(symtab, esymtab, name) + void *symtab; /* pointer to start of symbol table */ + void *esymtab; /* pointer to end of string table, + for checking - rounded up to integer + boundary */ + char *name; +{ + Elf_Ehdr *elf; + Elf_Shdr *shp; + Elf_Sym *symp, *symtab_start, *symtab_end; + char *strtab_start, *strtab_end; + int i; + + if (ALIGNED_POINTER(symtab, long) == 0) { + printf("DDB: bad symbol table start address %p\n", symtab); + return; + } + + symtab_start = symtab_end = NULL; + strtab_start = strtab_end = NULL; + + /* + * The format of the symbols loaded by the boot program is: + * + * Elf exec header + * first section header + * . . . + * . . . + * last section header + * first symbol or string table section + * . . . + * . . . + * last symbol or string table section + */ + + /* + * Validate the Elf header. + */ + elf = (Elf_Ehdr *)symtab; + if (elf->e_ident[EI_MAG0] != ELFMAG0 + || elf->e_ident[EI_MAG1] != ELFMAG1 + || elf->e_ident[EI_MAG2] != ELFMAG2 + || elf->e_ident[EI_MAG3] != ELFMAG3) + goto badheader; + + if (!ELF_MACHINE_OK(elf->e_machine)) + goto badheader; + + /* + * We need to avoid the section header string table (small string + * table which names the sections). We do this by assuming that + * the following two conditions will be true: + * + * (1) .shstrtab will be smaller than one page. + * (2) .strtab will be larger than one page. + * + * When we encounter what we think is the .shstrtab, we change + * its section type Elf_sht_null so that it will be ignored + * later. + */ + shp = (Elf_Shdr *)((char*)symtab + elf->e_shoff); + for (i = 0; i < elf->e_shnum; i++) { + if (shp[i].sh_addr || i == elf->e_shstrndx) + continue; + switch (shp[i].sh_type) { + case SHT_STRTAB: + if (shp[i].sh_size < PAGE_SIZE) { + shp[i].sh_type = SHT_NULL; + continue; + } + if (strtab_start != NULL) + goto multiple_strtab; + strtab_start = (char *)symtab + shp[i].sh_offset; + strtab_end = (char *)symtab + shp[i].sh_offset + + shp[i].sh_size; + break; + + case SHT_SYMTAB: + if (symtab_start != NULL) + goto multiple_symtab; + symtab_start = (Elf_Sym *)((char*)symtab + shp[i].sh_offset); + symtab_end = (Elf_Sym *)((char*)symtab + shp[i].sh_offset + + shp[i].sh_size); + break; + + default: + /* Ignore all other sections. */ + break; + } + } + + /* + * Now, sanity check the symbols against the string table. + */ + if (symtab_start == NULL || strtab_start == NULL || + ALIGNED_POINTER(symtab_start, long) == 0 || + ALIGNED_POINTER(strtab_start, long) == 0) + goto badheader; + for (symp = symtab_start; symp < symtab_end; symp++) + if (symp->st_name + strtab_start > strtab_end) + goto badheader; + + /* + * Link the symbol table into the debugger. + */ + db_add_symbol_table((char *)symtab_start, + (char *)symtab_end, name, (char *)symtab); + printf("[ preserving %lu bytes of %s symbol table ]\n", + (u_long)roundup(((char*)esymtab - (char*)symtab), sizeof(u_long)), name); + return; + + badheader: + printf("[ %s symbol table not valid ]\n", name); + return; + + multiple_strtab: + printf("[ %s has multiple string tables ]\n", name); + return; + + multiple_symtab: + printf("[ %s has multiple symbol tables ]\n", name); + return; +} + +/* + * Internal helper function - return a pointer to the string table + * for the current symbol table. + */ +static char * +db_elf_find_strtab(stab) + db_symtab_t *stab; +{ + Elf_Ehdr *elf = STAB_TO_EHDR(stab); + Elf_Shdr *shp = STAB_TO_SHDR(stab, elf); + int i; + + for (i = 0; i < elf->e_shnum; i++) { + if (shp[i].sh_type == SHT_STRTAB + && !shp[i].sh_addr && i != elf->e_shstrndx) + return (stab->private + shp[i].sh_offset); + } + + return (NULL); +} + +/* + * Lookup the symbol with the given name. + */ +db_sym_t +X_db_lookup(stab, symstr) + db_symtab_t *stab; + char *symstr; +{ + Elf_Sym *symp, *symtab_start, *symtab_end; + char *strtab; + + symtab_start = STAB_TO_SYMSTART(stab); + symtab_end = STAB_TO_SYMEND(stab); + + strtab = db_elf_find_strtab(stab); + if (strtab == NULL) + return ((db_sym_t)0); + + for (symp = symtab_start; symp < symtab_end; symp++) { + if (symp->st_name != 0 && + db_eqname(strtab + symp->st_name, symstr, 0)) + return ((db_sym_t)symp); + } + + return ((db_sym_t)0); +} + +/* + * Search for the symbol with the given address (matching within the + * provided threshold). + */ +db_sym_t +X_db_search_symbol(symtab, off, strategy, diffp) + db_symtab_t *symtab; + db_addr_t off; + db_strategy_t strategy; + db_expr_t *diffp; /* in/out */ +{ + Elf_Sym *rsymp, *symp, *symtab_start, *symtab_end; + db_expr_t diff = *diffp; + + symtab_start = STAB_TO_SYMSTART(symtab); + symtab_end = STAB_TO_SYMEND(symtab); + + rsymp = NULL; + + for (symp = symtab_start; symp < symtab_end; symp++) { + if (symp->st_name == 0) + continue; + if (ELF_ST_TYPE(symp->st_info) != STT_OBJECT && + ELF_ST_TYPE(symp->st_info) != STT_FUNC) + continue; + + if (off >= symp->st_value) { + if ((off - symp->st_value) < diff) { + diff = off - symp->st_value; + rsymp = symp; + if (diff == 0) { + if (strategy == DB_STGY_PROC && + ELF_ST_TYPE(symp->st_info) == + STT_FUNC && + ELF_ST_BIND(symp->st_info) != + STB_LOCAL) + break; + if (strategy == DB_STGY_ANY && + ELF_ST_BIND(symp->st_info) != + STB_LOCAL) + break; + } + } else if ((off - symp->st_value) == diff) { + if (rsymp == NULL) + rsymp = symp; + else if (ELF_ST_BIND(rsymp->st_info) == + STB_LOCAL && + ELF_ST_BIND(symp->st_info) != + STB_LOCAL) { + /* pick the external symbol */ + rsymp = symp; + } + } + } + } + + if (rsymp == NULL) + *diffp = off; + else + *diffp = diff; + + return ((db_sym_t)rsymp); +} + +/* + * Return the name and value for a symbol. + */ +void +X_db_symbol_values(symtab, sym, namep, valuep) + db_symtab_t *symtab; + db_sym_t sym; + char **namep; + db_expr_t *valuep; +{ + Elf_Sym *symp = (Elf_Sym *)sym; + char *strtab; + + if (namep) { + strtab = db_elf_find_strtab(symtab); + if (strtab == NULL) + *namep = NULL; + else + *namep = strtab + symp->st_name; + } + + if (valuep) + *valuep = symp->st_value; +} + +/* + * Return the file and line number of the current program counter + * if we can find the appropriate debugging symbol. + */ +boolean_t +X_db_line_at_pc(symtab, cursym, filename, linenum, off) + db_symtab_t *symtab; + db_sym_t cursym; + char **filename; + int *linenum; + db_expr_t off; +{ + + /* + * XXX We don't support this (yet). + */ + return (FALSE); +} + +/* + * Returns the number of arguments to a function and their + * names if we can find the appropriate debugging symbol. + */ +boolean_t +X_db_sym_numargs(symtab, cursym, nargp, argnamep) + db_symtab_t *symtab; + db_sym_t cursym; + int *nargp; + char **argnamep; +{ + + /* + * XXX We don't support this (yet). + */ + return (FALSE); +} + +/* + * Initialization routine for Elf files. + */ +extern void *ksym_start, *ksym_end; + +void +kdb_init() +{ + + if (ksym_end > ksym_start) + X_db_sym_init(ksym_start, ksym_end, "kernel"); +} + +#endif /* DB_ELF_SYMBOLS */ diff --git a/sys/ddb/db_kld.c b/sys/ddb/db_kld.c new file mode 100644 index 000000000000..48ba135b4c63 --- /dev/null +++ b/sys/ddb/db_kld.c @@ -0,0 +1,137 @@ +/* + * 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. + * + * $Id$ + * from db_aout.c,v 1.20 1998/06/07 17:09:36 dfr Exp + */ + +/* + * Author: David B. Golub, Carnegie Mellon University + * Date: 7/90 + */ +/* + * Symbol table routines for a.out format files. + */ + +#include +#include +#include + +#include + +#include +#include + +extern linker_file_t linker_kernel_file; + +#define KF linker_kernel_file + +db_sym_t +X_db_lookup(stab, symstr) + db_symtab_t *stab; + char * symstr; +{ + linker_sym_t sym; + + if (!KF) + return 0; + + if (KF->ops->lookup_symbol(KF, symstr, &sym) == 0) + return (db_sym_t) sym; + else + return (db_sym_t) 0; +} + +db_sym_t +X_db_search_symbol(symtab, off, strategy, diffp) + db_symtab_t * symtab; + register + db_addr_t off; + db_strategy_t strategy; + db_expr_t *diffp; /* in/out */ +{ + linker_sym_t sym; + long diff; + + if (!KF) + return 0; + + if (KF->ops->search_symbol(KF, (caddr_t) off, &sym, &diff) == 0) { + *diffp = (db_expr_t) diff; + return (db_sym_t) sym; + } + + return 0; +} + +/* + * Return the name and value for a symbol. + */ +void +X_db_symbol_values(dbsym, namep, valuep) + db_sym_t dbsym; + char **namep; + db_expr_t *valuep; +{ + linker_sym_t sym = (linker_sym_t) dbsym; + linker_symval_t symval; + + KF->ops->symbol_values(KF, sym, &symval); + if (namep) + *namep = (char*) symval.name; + if (valuep) + *valuep = (db_expr_t) symval.value; +} + + +boolean_t +X_db_line_at_pc(symtab, cursym, filename, linenum, off) + db_symtab_t * symtab; + db_sym_t cursym; + char **filename; + int *linenum; + db_expr_t off; +{ + return FALSE; +} + +boolean_t +X_db_sym_numargs(symtab, cursym, nargp, argnamep) + db_symtab_t * symtab; + db_sym_t cursym; + int *nargp; + char **argnamep; +{ + return FALSE; +} + +/* + * Initialization routine for a.out files. + */ +void +kdb_init() +{ + db_add_symbol_table(0, 0, "kernel", 0); +}