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편집 파일: sym.c

/* -*- linux-c -*- * Symbolic Lookup Functions * Copyright (C) 2005-2018 Red Hat Inc. * Copyright (C) 2006 Intel Corporation. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ #ifndef _STP_SYM_C_ #define _STP_SYM_C_ #include "sym.h" #include "vma.c" #include "stp_string.c" #ifdef STP_NEED_LINE_DATA #include "unwind/unwind.h" #endif #include <asm/unaligned.h> #include <asm/uaccess.h> #include <linux/list.h> #include <linux/module.h> #ifdef STAPCONF_PROBE_KERNEL #include <linux/uaccess.h> #endif /* Returns absolute address of offset into kernel module/section. Returns zero when module and section couldn't be found (aren't in memory yet). */ static unsigned long _stp_kmodule_relocate(const char *module, const char *section, unsigned long offset) { unsigned i, j; dbug_sym(1, "%s, %s, %lx\n", module, section, offset); /* absolute, unrelocated address */ if (!module || !strcmp(section, "") ||_stp_num_modules == 0) { return offset; } for (i = 0; i < _stp_num_modules; i++) { struct _stp_module *m = _stp_modules[i]; if (strcmp(module, m->name)) /* duplication apprx. not possible for kernel */ continue; for (j = 0; j < m->num_sections; j++) { struct _stp_section *s = &m->sections[j]; if (!strcmp(section, s->name)) { /* mod and sec name match. tsk should match dynamic/static. */ if (s->static_addr != 0) { unsigned long addr = offset + s->static_addr; dbug_sym(1, "address=%lx\n", addr); return addr; } else { /* static section, not in memory yet? */ dbug_sym(1, "section %s, not in memory yet?", s->name); return 0; } } } } return 0; } static unsigned long _stp_umodule_relocate(const char *path, unsigned long offset, struct task_struct *tsk) { unsigned i; unsigned long vm_start = 0; dbug_sym(1, "[%d] %s, %lx\n", tsk->pid, path, offset); for (i = 0; i < _stp_num_modules; i++) { struct _stp_module *m = _stp_modules[i]; if (strcmp(path, m->path) || m->num_sections != 1) continue; if (!strcmp(m->sections[0].name, ".absolute")) return offset; if (strcmp(m->sections[0].name, ".dynamic")) continue; if (stap_find_vma_map_info_user(tsk->group_leader, m, &vm_start, NULL, NULL) == 0) { offset += vm_start; dbug_sym(1, "address=%lx\n", offset); return offset; } } return 0; } /* Return (kernel) module owner and, if sec != NULL, fills in closest section of the address if found, return NULL otherwise. */ static struct _stp_module *_stp_kmod_sec_lookup(unsigned long addr, struct _stp_section **sec) { unsigned midx = 0; for (midx = 0; midx < _stp_num_modules; midx++) { unsigned secidx; for (secidx = 0; secidx < _stp_modules[midx]->num_sections; secidx++) { unsigned long sec_addr; unsigned long sec_size; sec_addr = _stp_modules[midx]->sections[secidx].static_addr; sec_size = _stp_modules[midx]->sections[secidx].size; if (addr >= sec_addr && addr < sec_addr + sec_size) { if (sec) *sec = & _stp_modules[midx]->sections[secidx]; return _stp_modules[midx]; } } } return NULL; } /* Return (user) module in which the the given addr falls. Returns NULL when no module can be found that contains the addr. Fills in vm_start (addr where module is mapped in) and (base) name of module when given. Note that user modules always have exactly one section (.dynamic or .absolute). */ static struct _stp_module *_stp_umod_lookup(unsigned long addr, struct task_struct *task, const char **name, unsigned long *vm_start, unsigned long *vm_end) { void *user = NULL; #ifdef CONFIG_COMPAT /* Handle 32bit signed values in 64bit longs, chop off top bits. */ if (test_tsk_thread_flag(task, TIF_32BIT)) addr &= ((compat_ulong_t) ~0); #endif if (stap_find_vma_map_info(task->group_leader, addr, vm_start, vm_end, name, &user) == 0) if (user != NULL) { struct _stp_module *m = (struct _stp_module *)user; dbug_sym(1, "found module %s at 0x%lx\n", m->path, vm_start ? *vm_start : 0); return m; } return NULL; } static const char *_stp_kallsyms_lookup(unsigned long addr, unsigned long *symbolsize, unsigned long *offset, const char **modname, /* char ** secname? */ struct task_struct *task) { struct _stp_module *m = NULL; struct _stp_section *sec = NULL; struct _stp_symbol *s = NULL; unsigned end, begin = 0; unsigned long rel_addr = 0; if (addr == 0) return NULL; if (task) { unsigned long vm_start = 0; unsigned long vm_end = 0; #ifdef CONFIG_COMPAT /* Handle 32bit signed values in 64bit longs, chop off top bits. _stp_umod_lookup does the same, but we need it here for the binary search on addr below. */ if (test_tsk_thread_flag(task, TIF_32BIT)) addr &= ((compat_ulong_t) ~0); #endif m = _stp_umod_lookup(addr, task, modname, &vm_start, &vm_end); if (m) { sec = &m->sections[0]; /* XXX .absolute sections really shouldn't be here... */ if (strcmp(".dynamic", m->sections[0].name) == 0) rel_addr = addr - vm_start; else rel_addr = addr; } if (modname && *modname) { /* In case no symbol is found, fill in based on module. */ if (offset) *offset = addr - vm_start; if (symbolsize) *symbolsize = vm_end - vm_start; } } else { m = _stp_kmod_sec_lookup(addr, &sec); if (m) { rel_addr = addr - sec->static_addr; if (modname) *modname = m->name; } } if (unlikely (m == NULL || sec == NULL)) return NULL; /* NB: relativize the address to the section. */ addr = rel_addr; end = sec->num_symbols; /* binary search for symbols within the module */ do { unsigned mid = (begin + end) / 2; if (addr < sec->symbols[mid].addr) end = mid; else begin = mid; } while (begin + 1 < end); /* result index in $begin */ s = & sec->symbols[begin]; if (likely(addr >= s->addr)) { if (offset) *offset = addr - s->addr; /* We could also pass sec->name here. */ if (symbolsize) { if ((begin + 1) < sec->num_symbols) *symbolsize = sec->symbols[begin + 1].addr - s->addr; else *symbolsize = 0; // NB: This is only a heuristic. Sometimes there are large // gaps between text areas of modules. } return s->symbol; } return NULL; } #ifdef STP_NEED_LINE_DATA static void _stp_filename_lookup(struct _stp_module *mod, char ** filename, uint8_t *dirsecp, uint8_t *enddirsecp, unsigned fileidx, int user, int compat_task) { uint8_t *linep = dirsecp; static char fullpath [MAXSTRINGLEN]; char *dirname_entry = NULL, *filename_entry = NULL; unsigned diridx = 0, i, j; // skip past the directory table in the debug_line info while (*linep != 0 && linep < enddirsecp) { char *entry = (char *) linep; uint8_t *endnamep = (uint8_t *) memchr (entry, '\0', (size_t) (enddirsecp-linep)); if (endnamep == NULL || (endnamep + 1) > enddirsecp) return; linep = endnamep + 1; } if ((char) linep[0] != '\0') return; ++linep; // at the filename table for (i = 1; *linep != 0 && linep < enddirsecp; ++i) { uint8_t *endnamep = NULL; filename_entry = (char *) linep; endnamep = (uint8_t *) memchr (filename_entry, '\0', (size_t) (enddirsecp-linep)); if (endnamep == NULL || (endnamep + 1) > enddirsecp) return; // move the line pointer past the file name. account for the null byte linep = endnamep + 1; // save the directory index diridx = read_pointer ((const uint8_t **) &linep, enddirsecp, DW_EH_PE_leb128, user, compat_task); if (linep > enddirsecp) return; if (i == fileidx) break; filename_entry = NULL; // modification time read_pointer ((const uint8_t **) &linep, enddirsecp, DW_EH_PE_leb128, user, compat_task); // length of a file read_pointer ((const uint8_t **) &linep, enddirsecp, DW_EH_PE_leb128, user, compat_task); // check that nothing went wrong with reading the ulebs if (linep > enddirsecp) return; } if (filename_entry == NULL) return; // return just the linenumber // if dirid == 0, it's the compilation directory. otherwise retrieve the // directory path if the file path was relative if (diridx != 0 && filename_entry[0] != '/') { linep = dirsecp; for (j = 1; *linep != 0 && linep < enddirsecp; j++) { uint8_t *endnamep = NULL; dirname_entry = (char *) linep; endnamep = (uint8_t *) memchr (dirname_entry, '\0', (size_t) (enddirsecp-linep)); if (endnamep == NULL || (endnamep + 1) > enddirsecp) return; if (j == diridx) break; dirname_entry = NULL; linep = endnamep + 1; } if (dirname_entry == NULL) return; } // bring it all together // the filename was the full path if (filename_entry[0] == '/') *filename = filename_entry; // relative filename, and the dir corresponds to the compilation dir else if (diridx == 0) { char *slash = strrchr (mod->path, '/'); strlcpy(fullpath, mod->path, (size_t) (2 + slash - mod->path)); strlcat(fullpath, filename_entry, MAXSTRINGLEN); *filename = fullpath; } // relative filename and a directory from the table in the debug line data else { strlcpy(fullpath, dirname_entry, MAXSTRINGLEN); strlcat(fullpath, "/", MAXSTRINGLEN); strlcat(fullpath, filename_entry, MAXSTRINGLEN); *filename = fullpath; } } #endif /* STP_NEED_LINE_DATA */ unsigned long _stp_linenumber_lookup(unsigned long addr, struct task_struct *task, char ** filename, int need_filename) { struct _stp_module *m; struct _stp_section *sec; const char *modname = NULL; uint8_t *linep, *enddatap; int compat_task = _stp_is_compat_task(); int user = (task ? 1 : 0); // the portion below is encased in this conditional because some of the functions // and constants needed are encased in a similar condition #ifdef STP_NEED_LINE_DATA if (addr == 0) return 0; if (task) { unsigned long vm_start = 0; unsigned long vm_end = 0; #ifdef CONFIG_COMPAT /* Handle 32bit signed values in 64bit longs, chop off top bits. */ if (test_tsk_thread_flag(task, TIF_32BIT)) addr &= ((compat_ulong_t) ~0); #endif m = _stp_umod_lookup(addr, task, &modname, &vm_start, &vm_end); } else m = _stp_kmod_sec_lookup(addr, &sec); if (m == NULL || m->debug_line == NULL) return 0; // if addr is a kernel address, it will need to be adjusted if (!task) { int i; unsigned long offset = 0; // have to factor in the load_offset of (specifically) the .text section for (i=0; i<m->num_sections; i++) if (!strcmp(m->sections[i].name, ".text")) { offset = (m->sections[i].static_addr - m->sections[i].sec_load_offset); break; } if (addr < offset) return 0; addr = addr - offset; } linep = m->debug_line; enddatap = m->debug_line + m->debug_line_len; while (linep < enddatap) { // State machine "curr" values are updated directly. // A "row" is committed line data that we should compare against, only // updated for DW_LNS_copy, DW_LNE_end_sequence, and special opcodes. uint64_t curr_addr = 0, row_addr = 0; unsigned int curr_file_idx = 1, row_file_idx = 1; unsigned long curr_linenum = 1, row_linenum = 1; unsigned int row_end_sequence = 1; unsigned int length = 4; unsigned int skip_to_seq_end = 0, op_index = 0; uint64_t unit_length, hdr_length; uint8_t *endunitp, *endhdrp, *dirsecp, *stdopcode_lens_secp; uint16_t version; uint8_t opcode_base, line_range, min_instr_len = 0, max_ops = 1; int8_t line_base; unit_length = (uint64_t) read_pointer ((const uint8_t **) &linep, enddatap, DW_EH_PE_data4, user, compat_task); if (unit_length == 0xffffffff) { if (unlikely (linep + 8 > enddatap)) return 0; unit_length = (uint64_t) read_pointer ((const uint8_t **) &linep, enddatap, DW_EH_PE_data8, user, compat_task); length = 8; } if (unit_length < (length + 2) || (linep + unit_length) > enddatap) return 0; endunitp = linep + unit_length; version = read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_data2, user, compat_task); if (length == 4) hdr_length = (uint64_t) read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_data4, user, compat_task); else hdr_length = (uint64_t) read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_data8, user, compat_task); if ((linep + hdr_length) > endunitp || hdr_length < (version >= 4 ? 6 : 5)) return 0; endhdrp = linep + hdr_length; // minimum instruction length min_instr_len = *linep++; // max operations per instruction if (version >= 4) { max_ops = *linep++; if (max_ops == 0) return 0; // max operations per instruction is supposed to > 0; } // default value of the is_stmt register ++linep; // line base. this is a signed value. line_base = *linep++; // line range line_range = *linep++; if (line_range == 0) return 0; // opcode base opcode_base = *linep++; // opcodes stdopcode_lens_secp = linep - 1; // need this check if the header length check covers this region? if ((linep + opcode_base - 1) >= endhdrp) return 0; linep += opcode_base - 1; // at the directory table. don't need an other information from the header // in order to find the desired line number, so we will save a pointer to // this point and skip ahead to the end of the header. this portion of the // header will be visited again after a line number has been found if a // filename is needed. dirsecp = linep; linep = endhdrp; // iterating through the opcodes. will deal with three defined types of // opcode: special, extended and standard. there is also a portion at // the end of this loop that will deal with unknown (standard) opcodes. while (linep < endunitp) { uint8_t opcode = *linep++; long addr_adv = 0; unsigned int commit_row = 0; unsigned int end_sequence = 0; if (opcode >= opcode_base) // special opcode { // line range was checked before this point. this variable is not altered after it is initialized. curr_linenum += (line_base + ((opcode - opcode_base) % line_range)); addr_adv = ((opcode - opcode_base) / line_range); commit_row = 1; } else if (opcode == 0) // extended opcode { int len; uint8_t subopcode; if (linep + 1 > endunitp) return 0; len = *linep++; if (linep + len > endunitp || len < 1) return 0; subopcode = *linep++; // the sub opcode switch (subopcode) { case DW_LNE_end_sequence: // NB: we don't clear "curr" values until after the row is compared. op_index = 0; skip_to_seq_end = 0; end_sequence = 1; commit_row = 1; break; case DW_LNE_set_address: if ((len - 1) == 4) // account for the opcode (the -1) curr_addr = (uint64_t) read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_data4, user, compat_task); else if ((len - 1) == 8) curr_addr = (uint64_t) read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_data8, user, compat_task); else return 0; // if the set address is past the address we want, iterate // to the end of the sequence without doing more address // and linenumber calcs than necessary if (curr_addr > addr) skip_to_seq_end = 1; op_index = 0; break; default: // advance the ptr by the specified amount linep += len-1; break; } } else if (opcode <= DW_LNS_set_isa) // known standard opcode { uint8_t *linep_before = linep; switch (opcode) { case DW_LNS_copy: commit_row = 1; break; case DW_LNS_advance_pc: addr_adv = read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_leb128, user, compat_task); break; case DW_LNS_fixed_advance_pc: addr_adv = read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_data2, user, compat_task); if (linep_before == linep) // the read failed return 0; op_index = 0; break; case DW_LNS_advance_line: curr_linenum += read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_leb128+DW_EH_PE_signed, user, compat_task); break; case DW_LNS_set_file: curr_file_idx = read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_leb128, user, compat_task); break; case DW_LNS_set_column: read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_leb128, user, compat_task); break; case DW_LNS_const_add_pc: addr_adv = ((255 - opcode_base) / line_range); break; case DW_LNS_set_isa: read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_leb128, user, compat_task); break; } if (linep > endunitp) // reading in the leb128 failed return 0; } else { int i; for (i=stdopcode_lens_secp[opcode]; i>0; --i) { read_pointer ((const uint8_t **) &linep, endunitp, DW_EH_PE_leb128, user, compat_task); if (linep > endunitp) return 0; } } // don't worry about doing address advances since we are waiting // till we hit the end of the sequence or the end of the unit at which // point the address and linenumber will be reset if (skip_to_seq_end) continue; // calculate actual address advance if (addr_adv != 0 && opcode != DW_LNS_fixed_advance_pc) { addr_adv = min_instr_len * (op_index + addr_adv) / max_ops; op_index = (op_index + addr_adv) % max_ops; } curr_addr += addr_adv; if (commit_row) { // compare the whole range from the prior committed row // (except an end_sequence can't be the base) if (row_end_sequence == 0 && row_addr <= addr && addr < curr_addr) { if (need_filename) _stp_filename_lookup(m, filename, dirsecp, endhdrp, row_file_idx, user, compat_task); return row_linenum; } if (end_sequence) { curr_addr = 0; curr_file_idx = 1; curr_linenum = 1; } row_addr = curr_addr; row_file_idx = curr_file_idx; row_linenum = curr_linenum; row_end_sequence = end_sequence; } } } #endif /* STP_NEED_LINE_DATA */ // no linenumber was found otherwise this function would have returned before this point return 0; } static int _stp_build_id_check (struct _stp_module *m, unsigned long notes_addr, struct task_struct *tsk) { int j; for (j = 0; j < m->build_id_len; j++) { /* Use set_fs / get_user to access conceivably invalid addresses. * If loc2c-runtime.h were more easily usable, a deref() loop * could do it too. */ mm_segment_t oldfs = get_fs(); int rc; unsigned char theory, practice = 0; #ifdef STAPCONF_PROBE_KERNEL if (!tsk) { theory = m->build_id_bits[j]; set_fs(KERNEL_DS); rc = probe_kernel_read(&practice, (void*)(notes_addr + j), 1); } else #endif { theory = m->build_id_bits[j]; set_fs (tsk ? USER_DS : KERNEL_DS); /* * Why check CONFIG_UTRACE here? If we're using real in-kernel * utrace, we can always just call get_user() (since we're * either reading kernel memory or tsk == current). * * Since we're only reading here, we can call * __access_process_vm_noflush(), which only calls things that * are exported. */ #ifdef CONFIG_UTRACE rc = get_user(practice, ((unsigned char*)(void*)(notes_addr + j))); #else if (!tsk || tsk == current) { rc = get_user(practice, ((unsigned char*)(void*)(notes_addr + j))); } else { rc = (__access_process_vm_noflush(tsk, (notes_addr + j), &practice, 1, 0) != 1); } #endif } set_fs(oldfs); if (rc || (theory != practice)) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27) _stp_error ("Build-id mismatch [man error::buildid]: \"%s\" byte %d (0x%02x vs 0x%02x) address %#lx rc %d\n", m->path, j, theory, practice, notes_addr, rc); return 1; #else /* This branch is a surrogate for kernels affected by Fedora bug * #465873. */ _stp_warn (KERN_WARNING "Build-id mismatch [man error::buildid]: \"%s\" byte %d (0x%02x vs 0x%02x) rc %d\n", m->path, j, theory, practice, rc); #endif break; } /* end mismatch */ } /* end per-byte check loop */ return 0; } /* Validate all-modules + kernel based on build-id (if present). * The completed case is the following combination: * Debuginfo Module Kernel * X X * has build-id/not unloaded has build-id/not * loaded && (has build-id/not) * * NB: build-id exists only if ld>=2.18 and kernel>= 2.6.23 */ static int _stp_module_check(void) { struct _stp_module *m = NULL; unsigned long notes_addr, base_addr; unsigned i,j; int rc = 0; #ifdef STP_NO_BUILDID_CHECK return 0; #endif for (i = 0; i < _stp_num_modules; i++) { m = _stp_modules[i]; if (m->build_id_len > 0 && m->notes_sect != 0) { dbug_sym(1, "build-id validation [%s]\n", m->name); /* kernel only */ /* skip userspace program */ if (m->name[0] != '/') continue; /* notes end address */ if (!strcmp(m->name, "kernel")) { notes_addr = _stp_kmodule_relocate("kernel", "_stext", m->build_id_offset); base_addr = _stp_kmodule_relocate("kernel", "_stext", 0); } else { notes_addr = m->notes_sect + m->build_id_offset; base_addr = m->notes_sect; } if (notes_addr <= base_addr) { /* shouldn't happen */ _stp_warn ("build-id address %lx <= base %lx\n", notes_addr, base_addr); continue; } rc |= _stp_build_id_check (m, notes_addr, NULL); } /* end checking */ } /* end loop */ return rc; } /* Iterate over _stp_modules, looking for a kernel module of given name. Run build-id checking for it. Return 0 on ok. */ static int _stp_kmodule_check (const char *name) { struct _stp_module *m = NULL; unsigned long notes_addr, base_addr; unsigned i,j; #ifdef STP_NO_BUILDID_CHECK return 0; #endif WARN_ON(!name || name[0]=='/'); // non-userspace only for (i = 0; i < _stp_num_modules; i++) { m = _stp_modules[i]; /* PR16406 must be unique kernel module name (non-/-prefixed path) */ if (strcmp (name, m->name)) continue; if (m->build_id_len > 0 && m->notes_sect != 0) { dbug_sym(1, "build-id validation [%s]\n", m->name); /* notes end address */ notes_addr = m->notes_sect + m->build_id_offset; base_addr = m->notes_sect; if (notes_addr <= base_addr) { /* shouldn't happen */ _stp_warn ("build-id address %lx < base %lx\n", notes_addr, base_addr); continue; } return _stp_build_id_check (m, notes_addr, NULL); } /* end checking */ } /* end loop */ return 0; /* not found */ } /* Validate user module based on build-id (if present) */ static int _stp_usermodule_check(struct task_struct *tsk, const char *path_name, unsigned long addr) { struct _stp_module *m = NULL; unsigned long notes_addr; unsigned i, j; unsigned char practice_id_bits[MAXSTRINGLEN]; unsigned long vm_end = 0; #ifdef STP_NO_BUILDID_CHECK return 0; #endif WARN_ON(!path_name || path_name[0]!='/'); // user-space only for (i = 0; i < _stp_num_modules; i++) { m = _stp_modules[i]; /* PR16406 must be unique userspace name (/-prefixed path); it's also in m->name */ if (strcmp(path_name, m->path) != 0) continue; if (m->build_id_len > 0) { int ret, build_id_len; notes_addr = addr + m->build_id_offset /* + m->module_base */; dbug_sym(1, "build-id validation [%d %s] address=%#lx build_id_offset=%#lx\n", tsk->pid, m->path, addr, m->build_id_offset); if (notes_addr <= addr) { _stp_warn ("build-id address %lx < base %lx\n", notes_addr, addr); continue; } return _stp_build_id_check (m, notes_addr, tsk); } } return 0; /* not found */ } /** Prints an address based on the _STP_SYM flags. * @param address The address to lookup. * @param task The address to lookup (if NULL lookup kernel/module address). * @note Symbolic lookups should not normally be done within * a probe because it is too time-consuming. Use at module exit time. */ static int _stp_snprint_addr(char *str, size_t len, unsigned long address, int flags, struct task_struct *task) { const char *modname = NULL; const char *name = NULL; char *filename = NULL; unsigned long offset = 0, size = 0, linenumber = 0; char *exstr, *poststr, *prestr; prestr = (flags & _STP_SYM_PRE_SPACE) ? " " : ""; exstr = (((flags & _STP_SYM_INEXACT) && (flags & _STP_SYM_SYMBOL)) ? " (inexact)" : ""); if (flags & _STP_SYM_POST_SPACE) poststr = " "; else if (flags & _STP_SYM_NEWLINE) poststr = "\n"; else poststr = ""; if (flags & (_STP_SYM_SYMBOL | _STP_SYM_MODULE)) { name = _stp_kallsyms_lookup(address, &size, &offset, &modname, task); if (name && name[0] == '.') name++; } if (modname && (flags & _STP_SYM_MODULE_BASENAME)) { char *slash = strrchr (modname, '/'); if (slash) modname = slash+1; } if ((flags & _STP_SYM_LINENUMBER) || (flags & _STP_SYM_FILENAME)) { linenumber = _stp_linenumber_lookup (address, task, &filename, (int) (flags & _STP_SYM_FILENAME)); } if (name && (flags & _STP_SYM_SYMBOL)) { if ((flags & _STP_SYM_MODULE) && modname && *modname) { if (flags & _STP_SYM_OFFSET) { if (flags & _STP_SYM_SIZE) { /* symbol, module, offset and size. */ if (flags & _STP_SYM_HEX_SYMBOL) return _stp_snprintf(str, len, "%s%p : %s+%#lx/%#lx [%s]%s%s", prestr, (int64_t) address, name, offset, size, modname, exstr, poststr); else return _stp_snprintf(str, len, "%s%s+%#lx/%#lx [%s]%s%s", prestr, name, offset, size, modname, exstr, poststr); } else { /* symbol, module, offset. */ if (flags & _STP_SYM_HEX_SYMBOL) return _stp_snprintf(str, len, "%s%p : %s+%#lx [%s]%s%s", prestr, (int64_t) address, name, offset, modname, exstr, poststr); else return _stp_snprintf(str, len, "%s%s+%#lx [%s]%s%s", prestr, name, offset, modname, exstr, poststr); } } else { /* symbol plus module */ if (flags & _STP_SYM_HEX_SYMBOL) return _stp_snprintf(str, len, "%s%p : %s [%s]%s%s", prestr, (int64_t) address, name, modname, exstr, poststr); else return _stp_snprintf(str, len, "%s%s [%s]%s%s", prestr, name, modname, exstr, poststr); } } else if (flags & _STP_SYM_OFFSET) { if (flags & _STP_SYM_SIZE) { /* symbol name, offset + size, no module name */ if (flags & _STP_SYM_HEX_SYMBOL) return _stp_snprintf(str, len, "%s%p : %s+%#lx/%#lx%s%s", prestr, (int64_t) address, name, offset, size, exstr, poststr); else return _stp_snprintf(str, len, "%s%s+%#lx/%#lx%s%s", prestr, name, offset, size, exstr, poststr); } else { /* symbol name, offset, no module name */ if (flags & _STP_SYM_HEX_SYMBOL) return _stp_snprintf(str, len, "%s%p : %s+%#lx%s%s", prestr, (int64_t) address, name, offset, exstr, poststr); else return _stp_snprintf(str, len, "%s%s+%#lx%s%s", prestr, name, offset, exstr, poststr); } } else { /* symbol name only */ if (flags & _STP_SYM_HEX_SYMBOL) return _stp_snprintf(str, len, "%s%p : %s%s%s", prestr, (int64_t) address, name, exstr, poststr); else return _stp_snprintf(str, len, "%s%s%s%s", prestr, name, exstr, poststr); } } else { /* no symbol name */ if (modname && *modname && (flags & _STP_SYM_MODULE)) { if (flags & _STP_SYM_OFFSET) { if (flags & _STP_SYM_SIZE) { /* hex address, module name, offset + size */ return _stp_snprintf(str, len, "%s%p [%s+%#lx/%#lx]%s%s", prestr, (int64_t) address, modname, offset, size, exstr, poststr); } else { /* hex address, module name, offset */ return _stp_snprintf(str, len, "%s%p [%s+%#lx]%s%s", prestr, (int64_t) address, modname, offset, exstr, poststr); } } else { /* hex address, module name */ return _stp_snprintf(str, len, "%s%p [%s]%s%s", prestr, (int64_t) address, modname, exstr, poststr); } #ifdef STAPCONF_MODULE_TEXT_ADDRESS } if ((flags & _STP_SYM_MODULE) && ! task) { /* No symbol, nor module name, but user really wants one, do one last try. */ struct module *ko; preempt_disable(); ko = __module_text_address (address); if (ko && ko->name) { /* hex address, module name */ int ret = _stp_snprintf(str, len, "%s%p [%s]%s%s", prestr, (int64_t) address, ko->name, exstr, poststr); preempt_enable_no_resched(); return ret; } preempt_enable_no_resched(); /* no names, hex only */ return _stp_snprintf(str, len, "%s%p%s%s", prestr, (int64_t) address, exstr, poststr); #endif } else if ((flags & _STP_SYM_LINENUMBER) && linenumber) { if (flags & _STP_SYM_FILENAME) { if (filename) { /* filename, linenumber */ return _stp_snprintf(str, len, "%s%s:%#lu%s%s", prestr, filename, linenumber, exstr, poststr); } else { /* filename=??, linenumber */ return _stp_snprintf(str, len, "%s??:%#lu%s%s", prestr, linenumber, exstr, poststr); } } else { /* linenumber */ return _stp_snprintf(str, len, "%s%#lu%s%s", prestr, linenumber, exstr, poststr); } } else if ((flags & _STP_SYM_FILENAME) && filename) { /* filename */ return _stp_snprintf(str, len, "%s%s%s%s", prestr, filename, exstr, poststr); }else { /* no names, hex only */ return _stp_snprintf(str, len, "%s%p%s%s", prestr, (int64_t) address, exstr, poststr); } } } static void _stp_print_addr(unsigned long address, int flags, struct task_struct *task) { _stp_snprint_addr(NULL, 0, address, flags, task); } /** @} */ /* Update the given module/section's offset value. Assume that there is no need for locking or for super performance. NB: this is only for kernel modules, which exist singly at run time. User-space modules (executables, shared libraries) exist at different addresses in different processes, so are tracked in the _stp_tf_vma_map. */ static void _stp_kmodule_update_address(const char* module, const char* reloc, /* NULL="all" */ unsigned long address) { unsigned mi, si; for (mi=0; mi<_stp_num_modules; mi++) { const char *note_sectname = ".note.gnu.build-id"; if (strcmp (_stp_modules[mi]->name, module)) continue; if (!reloc || !strcmp (note_sectname, reloc)) { dbug_sym(1, "module %s special section %s address %#lx\n", _stp_modules[mi]->name, note_sectname, address); _stp_modules[mi]->notes_sect = address; /* cache this particular address */ } for (si=0; si<_stp_modules[mi]->num_sections; si++) { if (reloc && strcmp (_stp_modules[mi]->sections[si].name, reloc)) continue; else { dbug_sym(1, "module %s section %s address %#lx\n", _stp_modules[mi]->name, _stp_modules[mi]->sections[si].name, address); _stp_modules[mi]->sections[si].static_addr = address; if (reloc) break; else continue; /* wildcarded - will have more hits */ } } /* loop over sections */ } /* loop over modules */ } #ifndef STAPCONF_KALLSYMS unsigned long kallsyms_lookup_name (const char *name) { /* NB: PR14804: don't use _stp_error here. It's called too early for the actual message buffer goo to be allocated. */ /* Don't even printk. A user can't do anything about it. */ /* printk (KERN_ERR "kallsyms_lookup_name unavailable for %s\n", name); */ return 0; } #endif #endif /* _STP_SYM_C_ */