/* $OpenBSD: db_struct.c,v 1.4 2015/09/01 05:26:10 jsg Exp $ */ /* * Copyright (c) 2009 Miodrag Vallat. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * ddb routines to describe struct information */ #include <sys/param.h> #include <sys/systm.h> #include <machine/db_machdep.h> #include <ddb/db_lex.h> #include <ddb/db_output.h> #include <ddb/db_access.h> #include <ddb/db_command.h> #include <ddb/db_extern.h> #include <ddb/db_interface.h> #include <ddb/db_var.h> #include "db_structinfo.h" void db_struct_print_field(uint, int, db_expr_t); /* * Flags to pass db_struct_printf(). */ #define DBSP_STRUCT_NAME 0x01 /* prepend struct name */ #define DBSP_VALUE 0x02 /* display field value */ void db_struct_print_field(uint fidx, int flags, db_expr_t baseaddr) { const struct ddb_field_info *field; const struct ddb_struct_info *struc; db_expr_t value; uint tmp; size_t namelen; int width, basecol, curcol; char tmpfmt[28]; field = &ddb_field_info[fidx]; basecol = 0; if (ISSET(flags, DBSP_STRUCT_NAME)) { struc = &ddb_struct_info[field->sidx]; namelen = strlen(ddb_structfield_strings + struc->name); db_printf("%-30s ", ddb_structfield_strings + struc->name); if (namelen > 30) basecol += namelen + 1; else basecol += 30 + 1; } namelen = strlen(ddb_structfield_strings + field->name); if (field->nitems == 1) { db_printf("%-30s ", ddb_structfield_strings + field->name); if (namelen > 30) basecol += namelen + 1; else basecol += 30 + 1; } else { width = 30 - 2; tmp = field->nitems; while (tmp != 0) { width--; tmp /= 10; } if (namelen >= width) { db_printf("%s[%hu] ", ddb_structfield_strings + field->name, field->nitems); basecol += namelen + (30 - width) + 1; } else { db_printf("%s[%hu]%*s ", ddb_structfield_strings + field->name, field->nitems, width - (int)namelen, ""); /* namelen + (30-width) + (width-namelen) + 1 */ basecol += 30 + 1; } } if (field->size == 0) { db_printf("bitfield"); /* basecol irrelevant from there on */ } else { snprintf(tmpfmt, sizeof tmpfmt, "%u", (u_int)field->size); basecol += strlen(tmpfmt) + 1; db_printf("%s ", tmpfmt); } if (ISSET(flags, DBSP_VALUE)) { /* only print the field value if it has a friendly size. */ switch (field->size) { case 1: width = 4; break; case 2: width = 8; break; case 4: width = 12; break; #ifdef __LP64__ case 8: width = 20; break; #endif default: width = 0; } if (width != 0) { baseaddr += field->offs; curcol = basecol; for (tmp = field->nitems; tmp != 0; tmp--) { value = db_get_value(baseaddr, field->size, FALSE); /* assume unsigned */ db_format(tmpfmt, sizeof tmpfmt, (long)value, DB_FORMAT_N, 0, width); if (field->nitems > 1) db_printf("%s", tmpfmt); else db_printf("%20s", tmpfmt); baseaddr += field->size; /* * Try to fit array elements on as few lines * as possible. */ if (field->nitems > 1 && tmp > 1) { curcol += width + 1; if (basecol >= db_max_width || curcol + width >= db_max_width) { /* new line */ db_printf("\n"); if (basecol + width >= db_max_width) { db_printf("\t"); curcol = 8; } else { db_printf("%*s", basecol, ""); curcol = basecol; } } else db_printf(" "); } } } } db_printf("\n"); } /* * show offset <value>: displays the list of struct fields which exist * at that particular offset from the beginning of the struct. */ void db_struct_offset_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modifiers) { db_expr_t offset = 0; const struct ddb_field_offsets *field; const ddb_field_off *fidx; uint oidx; int width; char tmpfmt[28]; /* * Read the offset from the debuggger input. * We don't want to get it from the standard parsing code, because * this would set `dot' to this value, which doesn't make sense. */ if (!db_expression(&offset) || offset < 0) { db_printf("not a valid offset\n"); db_flush_lex(); return; } db_skip_to_eol(); for (field = ddb_field_offsets, oidx = 0; oidx < NOFFS; field++, oidx++) if (field->offs == (size_t)offset) break; if (oidx == NOFFS) { width = 0; db_format(tmpfmt, sizeof tmpfmt, (long)offset, DB_FORMAT_N, 0, width); db_printf("no known structure element at offset %-*s\n", width, tmpfmt); db_flush_lex(); return; } db_printf("%-30s %-30s size\n", "struct", "member"); for (fidx = ddb_fields_by_offset + field->list; *fidx != 0; fidx++) db_struct_print_field(*fidx, DBSP_STRUCT_NAME, 0); } /* * show struct <struct name> [addr]: displays the data starting at addr * (`dot' if unspecified) as a struct of the given type. */ void db_struct_layout_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modifiers) { const struct ddb_struct_info *struc; uint sidx, fidx; int t; /* * Read the struct name from the debugger input. */ t = db_read_token(); if (t != tIDENT) { db_printf("Bad struct name\n"); db_flush_lex(); return; } for (struc = ddb_struct_info, sidx = 0; sidx < NSTRUCT; struc++, sidx++) if (strcmp(ddb_structfield_strings + struc->name, db_tok_string) == 0) break; if (sidx == NSTRUCT) { db_printf("unknown struct %s\n", db_tok_string); db_flush_lex(); return; } /* * Read the address, if any, from the debugger input. * In that case, update `dot' value. */ if (db_expression(&addr)) { db_dot = (db_addr_t)addr; db_last_addr = db_dot; } else addr = (db_expr_t)db_dot; db_skip_to_eol(); /* * Display the structure contents. */ db_printf("struct %s at %p (%u bytes)\n", ddb_structfield_strings + struc->name, (void *)addr, (u_int)struc->size); for (fidx = struc->fmin; fidx <= struc->fmax; fidx++) db_struct_print_field(fidx, DBSP_VALUE, addr); }