diff options
Diffstat (limited to 'src/tools/perf/util/probe-finder.c')
| -rw-r--r-- | src/tools/perf/util/probe-finder.c | 1593 |
1 files changed, 0 insertions, 1593 deletions
diff --git a/src/tools/perf/util/probe-finder.c b/src/tools/perf/util/probe-finder.c deleted file mode 100644 index 2b74d8e..0000000 --- a/src/tools/perf/util/probe-finder.c +++ /dev/null @@ -1,1593 +0,0 @@ -/* - * probe-finder.c : C expression to kprobe event converter - * - * Written by Masami Hiramatsu <mhiramat@redhat.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - */ - -#include <sys/utsname.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <errno.h> -#include <stdio.h> -#include <unistd.h> -#include <getopt.h> -#include <stdlib.h> -#include <string.h> -#include <stdarg.h> -#include <dwarf-regs.h> - -#include <linux/bitops.h> -#include "event.h" -#include "debug.h" -#include "util.h" -#include "symbol.h" -#include "probe-finder.h" - -/* Kprobe tracer basic type is up to u64 */ -#define MAX_BASIC_TYPE_BITS 64 - -/* Line number list operations */ - -/* Add a line to line number list */ -static int line_list__add_line(struct list_head *head, int line) -{ - struct line_node *ln; - struct list_head *p; - - /* Reverse search, because new line will be the last one */ - list_for_each_entry_reverse(ln, head, list) { - if (ln->line < line) { - p = &ln->list; - goto found; - } else if (ln->line == line) /* Already exist */ - return 1; - } - /* List is empty, or the smallest entry */ - p = head; -found: - pr_debug("line list: add a line %u\n", line); - ln = zalloc(sizeof(struct line_node)); - if (ln == NULL) - return -ENOMEM; - ln->line = line; - INIT_LIST_HEAD(&ln->list); - list_add(&ln->list, p); - return 0; -} - -/* Check if the line in line number list */ -static int line_list__has_line(struct list_head *head, int line) -{ - struct line_node *ln; - - /* Reverse search, because new line will be the last one */ - list_for_each_entry(ln, head, list) - if (ln->line == line) - return 1; - - return 0; -} - -/* Init line number list */ -static void line_list__init(struct list_head *head) -{ - INIT_LIST_HEAD(head); -} - -/* Free line number list */ -static void line_list__free(struct list_head *head) -{ - struct line_node *ln; - while (!list_empty(head)) { - ln = list_first_entry(head, struct line_node, list); - list_del(&ln->list); - free(ln); - } -} - -/* Dwarf FL wrappers */ -static char *debuginfo_path; /* Currently dummy */ - -static const Dwfl_Callbacks offline_callbacks = { - .find_debuginfo = dwfl_standard_find_debuginfo, - .debuginfo_path = &debuginfo_path, - - .section_address = dwfl_offline_section_address, - - /* We use this table for core files too. */ - .find_elf = dwfl_build_id_find_elf, -}; - -/* Get a Dwarf from offline image */ -static int debuginfo__init_offline_dwarf(struct debuginfo *self, - const char *path) -{ - int fd; - - fd = open(path, O_RDONLY); - if (fd < 0) - return fd; - - self->dwfl = dwfl_begin(&offline_callbacks); - if (!self->dwfl) - goto error; - - self->mod = dwfl_report_offline(self->dwfl, "", "", fd); - if (!self->mod) - goto error; - - self->dbg = dwfl_module_getdwarf(self->mod, &self->bias); - if (!self->dbg) - goto error; - - return 0; -error: - if (self->dwfl) - dwfl_end(self->dwfl); - else - close(fd); - memset(self, 0, sizeof(*self)); - - return -ENOENT; -} - -#if _ELFUTILS_PREREQ(0, 148) -/* This method is buggy if elfutils is older than 0.148 */ -static int __linux_kernel_find_elf(Dwfl_Module *mod, - void **userdata, - const char *module_name, - Dwarf_Addr base, - char **file_name, Elf **elfp) -{ - int fd; - const char *path = kernel_get_module_path(module_name); - - pr_debug2("Use file %s for %s\n", path, module_name); - if (path) { - fd = open(path, O_RDONLY); - if (fd >= 0) { - *file_name = strdup(path); - return fd; - } - } - /* If failed, try to call standard method */ - return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, - file_name, elfp); -} - -static const Dwfl_Callbacks kernel_callbacks = { - .find_debuginfo = dwfl_standard_find_debuginfo, - .debuginfo_path = &debuginfo_path, - - .find_elf = __linux_kernel_find_elf, - .section_address = dwfl_linux_kernel_module_section_address, -}; - -/* Get a Dwarf from live kernel image */ -static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, - Dwarf_Addr addr) -{ - self->dwfl = dwfl_begin(&kernel_callbacks); - if (!self->dwfl) - return -EINVAL; - - /* Load the kernel dwarves: Don't care the result here */ - dwfl_linux_kernel_report_kernel(self->dwfl); - dwfl_linux_kernel_report_modules(self->dwfl); - - self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias); - /* Here, check whether we could get a real dwarf */ - if (!self->dbg) { - pr_debug("Failed to find kernel dwarf at %lx\n", - (unsigned long)addr); - dwfl_end(self->dwfl); - memset(self, 0, sizeof(*self)); - return -ENOENT; - } - - return 0; -} -#endif - -struct debuginfo *debuginfo__new(const char *path) -{ - struct debuginfo *self = zalloc(sizeof(struct debuginfo)); - if (!self) - return NULL; - - if (debuginfo__init_offline_dwarf(self, path) < 0) { - free(self); - self = NULL; - } - - return self; -} - -struct debuginfo *debuginfo__new_online_kernel(unsigned long addr) -{ - struct debuginfo *self = zalloc(sizeof(struct debuginfo)); - if (!self) - return NULL; - - if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) { - free(self); - self = NULL; - } - - return self; -} - -void debuginfo__delete(struct debuginfo *self) -{ - if (self) { - if (self->dwfl) - dwfl_end(self->dwfl); - free(self); - } -} - -/* - * Probe finder related functions - */ - -static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) -{ - struct probe_trace_arg_ref *ref; - ref = zalloc(sizeof(struct probe_trace_arg_ref)); - if (ref != NULL) - ref->offset = offs; - return ref; -} - -/* - * Convert a location into trace_arg. - * If tvar == NULL, this just checks variable can be converted. - */ -static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, - Dwarf_Op *fb_ops, - struct probe_trace_arg *tvar) -{ - Dwarf_Attribute attr; - Dwarf_Op *op; - size_t nops; - unsigned int regn; - Dwarf_Word offs = 0; - bool ref = false; - const char *regs; - int ret; - - if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) - goto static_var; - - /* TODO: handle more than 1 exprs */ - if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || - dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || - nops == 0) { - /* TODO: Support const_value */ - return -ENOENT; - } - - if (op->atom == DW_OP_addr) { -static_var: - if (!tvar) - return 0; - /* Static variables on memory (not stack), make @varname */ - ret = strlen(dwarf_diename(vr_die)); - tvar->value = zalloc(ret + 2); - if (tvar->value == NULL) - return -ENOMEM; - snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); - tvar->ref = alloc_trace_arg_ref((long)offs); - if (tvar->ref == NULL) - return -ENOMEM; - return 0; - } - - /* If this is based on frame buffer, set the offset */ - if (op->atom == DW_OP_fbreg) { - if (fb_ops == NULL) - return -ENOTSUP; - ref = true; - offs = op->number; - op = &fb_ops[0]; - } - - if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { - regn = op->atom - DW_OP_breg0; - offs += op->number; - ref = true; - } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { - regn = op->atom - DW_OP_reg0; - } else if (op->atom == DW_OP_bregx) { - regn = op->number; - offs += op->number2; - ref = true; - } else if (op->atom == DW_OP_regx) { - regn = op->number; - } else { - pr_debug("DW_OP %x is not supported.\n", op->atom); - return -ENOTSUP; - } - - if (!tvar) - return 0; - - regs = get_arch_regstr(regn); - if (!regs) { - /* This should be a bug in DWARF or this tool */ - pr_warning("Mapping for the register number %u " - "missing on this architecture.\n", regn); - return -ERANGE; - } - - tvar->value = strdup(regs); - if (tvar->value == NULL) - return -ENOMEM; - - if (ref) { - tvar->ref = alloc_trace_arg_ref((long)offs); - if (tvar->ref == NULL) - return -ENOMEM; - } - return 0; -} - -#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) - -static int convert_variable_type(Dwarf_Die *vr_die, - struct probe_trace_arg *tvar, - const char *cast) -{ - struct probe_trace_arg_ref **ref_ptr = &tvar->ref; - Dwarf_Die type; - char buf[16]; - int bsize, boffs, total; - int ret; - - /* TODO: check all types */ - if (cast && strcmp(cast, "string") != 0) { - /* Non string type is OK */ - tvar->type = strdup(cast); - return (tvar->type == NULL) ? -ENOMEM : 0; - } - - bsize = dwarf_bitsize(vr_die); - if (bsize > 0) { - /* This is a bitfield */ - boffs = dwarf_bitoffset(vr_die); - total = dwarf_bytesize(vr_die); - if (boffs < 0 || total < 0) - return -ENOENT; - ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, - BYTES_TO_BITS(total)); - goto formatted; - } - - if (die_get_real_type(vr_die, &type) == NULL) { - pr_warning("Failed to get a type information of %s.\n", - dwarf_diename(vr_die)); - return -ENOENT; - } - - pr_debug("%s type is %s.\n", - dwarf_diename(vr_die), dwarf_diename(&type)); - - if (cast && strcmp(cast, "string") == 0) { /* String type */ - ret = dwarf_tag(&type); - if (ret != DW_TAG_pointer_type && - ret != DW_TAG_array_type) { - pr_warning("Failed to cast into string: " - "%s(%s) is not a pointer nor array.\n", - dwarf_diename(vr_die), dwarf_diename(&type)); - return -EINVAL; - } - if (die_get_real_type(&type, &type) == NULL) { - pr_warning("Failed to get a type" - " information.\n"); - return -ENOENT; - } - if (ret == DW_TAG_pointer_type) { - while (*ref_ptr) - ref_ptr = &(*ref_ptr)->next; - /* Add new reference with offset +0 */ - *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); - if (*ref_ptr == NULL) { - pr_warning("Out of memory error\n"); - return -ENOMEM; - } - } - if (!die_compare_name(&type, "char") && - !die_compare_name(&type, "unsigned char")) { - pr_warning("Failed to cast into string: " - "%s is not (unsigned) char *.\n", - dwarf_diename(vr_die)); - return -EINVAL; - } - tvar->type = strdup(cast); - return (tvar->type == NULL) ? -ENOMEM : 0; - } - - ret = dwarf_bytesize(&type); - if (ret <= 0) - /* No size ... try to use default type */ - return 0; - ret = BYTES_TO_BITS(ret); - - /* Check the bitwidth */ - if (ret > MAX_BASIC_TYPE_BITS) { - pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", - dwarf_diename(&type), MAX_BASIC_TYPE_BITS); - ret = MAX_BASIC_TYPE_BITS; - } - ret = snprintf(buf, 16, "%c%d", - die_is_signed_type(&type) ? 's' : 'u', ret); - -formatted: - if (ret < 0 || ret >= 16) { - if (ret >= 16) - ret = -E2BIG; - pr_warning("Failed to convert variable type: %s\n", - strerror(-ret)); - return ret; - } - tvar->type = strdup(buf); - if (tvar->type == NULL) - return -ENOMEM; - return 0; -} - -static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, - struct perf_probe_arg_field *field, - struct probe_trace_arg_ref **ref_ptr, - Dwarf_Die *die_mem) -{ - struct probe_trace_arg_ref *ref = *ref_ptr; - Dwarf_Die type; - Dwarf_Word offs; - int ret, tag; - - pr_debug("converting %s in %s\n", field->name, varname); - if (die_get_real_type(vr_die, &type) == NULL) { - pr_warning("Failed to get the type of %s.\n", varname); - return -ENOENT; - } - pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); - tag = dwarf_tag(&type); - - if (field->name[0] == '[' && - (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { - if (field->next) - /* Save original type for next field */ - memcpy(die_mem, &type, sizeof(*die_mem)); - /* Get the type of this array */ - if (die_get_real_type(&type, &type) == NULL) { - pr_warning("Failed to get the type of %s.\n", varname); - return -ENOENT; - } - pr_debug2("Array real type: (%x)\n", - (unsigned)dwarf_dieoffset(&type)); - if (tag == DW_TAG_pointer_type) { - ref = zalloc(sizeof(struct probe_trace_arg_ref)); - if (ref == NULL) - return -ENOMEM; - if (*ref_ptr) - (*ref_ptr)->next = ref; - else - *ref_ptr = ref; - } - ref->offset += dwarf_bytesize(&type) * field->index; - if (!field->next) - /* Save vr_die for converting types */ - memcpy(die_mem, vr_die, sizeof(*die_mem)); - goto next; - } else if (tag == DW_TAG_pointer_type) { - /* Check the pointer and dereference */ - if (!field->ref) { - pr_err("Semantic error: %s must be referred by '->'\n", - field->name); - return -EINVAL; - } - /* Get the type pointed by this pointer */ - if (die_get_real_type(&type, &type) == NULL) { - pr_warning("Failed to get the type of %s.\n", varname); - return -ENOENT; - } - /* Verify it is a data structure */ - tag = dwarf_tag(&type); - if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { - pr_warning("%s is not a data structure nor an union.\n", - varname); - return -EINVAL; - } - - ref = zalloc(sizeof(struct probe_trace_arg_ref)); - if (ref == NULL) - return -ENOMEM; - if (*ref_ptr) - (*ref_ptr)->next = ref; - else - *ref_ptr = ref; - } else { - /* Verify it is a data structure */ - if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { - pr_warning("%s is not a data structure nor an union.\n", - varname); - return -EINVAL; - } - if (field->name[0] == '[') { - pr_err("Semantic error: %s is not a pointor" - " nor array.\n", varname); - return -EINVAL; - } - if (field->ref) { - pr_err("Semantic error: %s must be referred by '.'\n", - field->name); - return -EINVAL; - } - if (!ref) { - pr_warning("Structure on a register is not " - "supported yet.\n"); - return -ENOTSUP; - } - } - - if (die_find_member(&type, field->name, die_mem) == NULL) { - pr_warning("%s(tyep:%s) has no member %s.\n", varname, - dwarf_diename(&type), field->name); - return -EINVAL; - } - - /* Get the offset of the field */ - if (tag == DW_TAG_union_type) { - offs = 0; - } else { - ret = die_get_data_member_location(die_mem, &offs); - if (ret < 0) { - pr_warning("Failed to get the offset of %s.\n", - field->name); - return ret; - } - } - ref->offset += (long)offs; - -next: - /* Converting next field */ - if (field->next) - return convert_variable_fields(die_mem, field->name, - field->next, &ref, die_mem); - else - return 0; -} - -/* Show a variables in kprobe event format */ -static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) -{ - Dwarf_Die die_mem; - int ret; - - pr_debug("Converting variable %s into trace event.\n", - dwarf_diename(vr_die)); - - ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, - pf->tvar); - if (ret == -ENOENT) - pr_err("Failed to find the location of %s at this address.\n" - " Perhaps, it has been optimized out.\n", pf->pvar->var); - else if (ret == -ENOTSUP) - pr_err("Sorry, we don't support this variable location yet.\n"); - else if (pf->pvar->field) { - ret = convert_variable_fields(vr_die, pf->pvar->var, - pf->pvar->field, &pf->tvar->ref, - &die_mem); - vr_die = &die_mem; - } - if (ret == 0) - ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); - /* *expr will be cached in libdw. Don't free it. */ - return ret; -} - -/* Find a variable in a scope DIE */ -static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) -{ - Dwarf_Die vr_die; - char buf[32], *ptr; - int ret = 0; - - if (!is_c_varname(pf->pvar->var)) { - /* Copy raw parameters */ - pf->tvar->value = strdup(pf->pvar->var); - if (pf->tvar->value == NULL) - return -ENOMEM; - if (pf->pvar->type) { - pf->tvar->type = strdup(pf->pvar->type); - if (pf->tvar->type == NULL) - return -ENOMEM; - } - if (pf->pvar->name) { - pf->tvar->name = strdup(pf->pvar->name); - if (pf->tvar->name == NULL) - return -ENOMEM; - } else - pf->tvar->name = NULL; - return 0; - } - - if (pf->pvar->name) - pf->tvar->name = strdup(pf->pvar->name); - else { - ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); - if (ret < 0) - return ret; - ptr = strchr(buf, ':'); /* Change type separator to _ */ - if (ptr) - *ptr = '_'; - pf->tvar->name = strdup(buf); - } - if (pf->tvar->name == NULL) - return -ENOMEM; - - pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); - /* Search child die for local variables and parameters. */ - if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { - /* Search again in global variables */ - if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die)) - ret = -ENOENT; - } - if (ret >= 0) - ret = convert_variable(&vr_die, pf); - - if (ret < 0) - pr_warning("Failed to find '%s' in this function.\n", - pf->pvar->var); - return ret; -} - -/* Convert subprogram DIE to trace point */ -static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, - Dwarf_Addr paddr, bool retprobe, - struct probe_trace_point *tp) -{ - Dwarf_Addr eaddr, highaddr; - GElf_Sym sym; - const char *symbol; - - /* Verify the address is correct */ - if (dwarf_entrypc(sp_die, &eaddr) != 0) { - pr_warning("Failed to get entry address of %s\n", - dwarf_diename(sp_die)); - return -ENOENT; - } - if (dwarf_highpc(sp_die, &highaddr) != 0) { - pr_warning("Failed to get end address of %s\n", - dwarf_diename(sp_die)); - return -ENOENT; - } - if (paddr > highaddr) { - pr_warning("Offset specified is greater than size of %s\n", - dwarf_diename(sp_die)); - return -EINVAL; - } - - /* Get an appropriate symbol from symtab */ - symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); - if (!symbol) { - pr_warning("Failed to find symbol at 0x%lx\n", - (unsigned long)paddr); - return -ENOENT; - } - tp->offset = (unsigned long)(paddr - sym.st_value); - tp->symbol = strdup(symbol); - if (!tp->symbol) - return -ENOMEM; - - /* Return probe must be on the head of a subprogram */ - if (retprobe) { - if (eaddr != paddr) { - pr_warning("Return probe must be on the head of" - " a real function.\n"); - return -EINVAL; - } - tp->retprobe = true; - } - - return 0; -} - -/* Call probe_finder callback with scope DIE */ -static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) -{ - Dwarf_Attribute fb_attr; - size_t nops; - int ret; - - if (!sc_die) { - pr_err("Caller must pass a scope DIE. Program error.\n"); - return -EINVAL; - } - - /* If not a real subprogram, find a real one */ - if (!die_is_func_def(sc_die)) { - if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { - pr_warning("Failed to find probe point in any " - "functions.\n"); - return -ENOENT; - } - } else - memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); - - /* Get the frame base attribute/ops from subprogram */ - dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); - ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); - if (ret <= 0 || nops == 0) { - pf->fb_ops = NULL; -#if _ELFUTILS_PREREQ(0, 142) - } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && - pf->cfi != NULL) { - Dwarf_Frame *frame; - if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || - dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { - pr_warning("Failed to get call frame on 0x%jx\n", - (uintmax_t)pf->addr); - return -ENOENT; - } -#endif - } - - /* Call finder's callback handler */ - ret = pf->callback(sc_die, pf); - - /* *pf->fb_ops will be cached in libdw. Don't free it. */ - pf->fb_ops = NULL; - - return ret; -} - -struct find_scope_param { - const char *function; - const char *file; - int line; - int diff; - Dwarf_Die *die_mem; - bool found; -}; - -static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) -{ - struct find_scope_param *fsp = data; - const char *file; - int lno; - - /* Skip if declared file name does not match */ - if (fsp->file) { - file = dwarf_decl_file(fn_die); - if (!file || strcmp(fsp->file, file) != 0) - return 0; - } - /* If the function name is given, that's what user expects */ - if (fsp->function) { - if (die_compare_name(fn_die, fsp->function)) { - memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); - fsp->found = true; - return 1; - } - } else { - /* With the line number, find the nearest declared DIE */ - dwarf_decl_line(fn_die, &lno); - if (lno < fsp->line && fsp->diff > fsp->line - lno) { - /* Keep a candidate and continue */ - fsp->diff = fsp->line - lno; - memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); - fsp->found = true; - } - } - return 0; -} - -/* Find an appropriate scope fits to given conditions */ -static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) -{ - struct find_scope_param fsp = { - .function = pf->pev->point.function, - .file = pf->fname, - .line = pf->lno, - .diff = INT_MAX, - .die_mem = die_mem, - .found = false, - }; - - cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); - - return fsp.found ? die_mem : NULL; -} - -static int probe_point_line_walker(const char *fname, int lineno, - Dwarf_Addr addr, void *data) -{ - struct probe_finder *pf = data; - Dwarf_Die *sc_die, die_mem; - int ret; - - if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) - return 0; - - pf->addr = addr; - sc_die = find_best_scope(pf, &die_mem); - if (!sc_die) { - pr_warning("Failed to find scope of probe point.\n"); - return -ENOENT; - } - - ret = call_probe_finder(sc_die, pf); - - /* Continue if no error, because the line will be in inline function */ - return ret < 0 ? ret : 0; -} - -/* Find probe point from its line number */ -static int find_probe_point_by_line(struct probe_finder *pf) -{ - return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); -} - -/* Find lines which match lazy pattern */ -static int find_lazy_match_lines(struct list_head *head, - const char *fname, const char *pat) -{ - FILE *fp; - char *line = NULL; - size_t line_len; - ssize_t len; - int count = 0, linenum = 1; - - fp = fopen(fname, "r"); - if (!fp) { - pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); - return -errno; - } - - while ((len = getline(&line, &line_len, fp)) > 0) { - - if (line[len - 1] == '\n') - line[len - 1] = '\0'; - - if (strlazymatch(line, pat)) { - line_list__add_line(head, linenum); - count++; - } - linenum++; - } - - if (ferror(fp)) - count = -errno; - free(line); - fclose(fp); - - if (count == 0) - pr_debug("No matched lines found in %s.\n", fname); - return count; -} - -static int probe_point_lazy_walker(const char *fname, int lineno, - Dwarf_Addr addr, void *data) -{ - struct probe_finder *pf = data; - Dwarf_Die *sc_die, die_mem; - int ret; - - if (!line_list__has_line(&pf->lcache, lineno) || - strtailcmp(fname, pf->fname) != 0) - return 0; - - pr_debug("Probe line found: line:%d addr:0x%llx\n", - lineno, (unsigned long long)addr); - pf->addr = addr; - pf->lno = lineno; - sc_die = find_best_scope(pf, &die_mem); - if (!sc_die) { - pr_warning("Failed to find scope of probe point.\n"); - return -ENOENT; - } - - ret = call_probe_finder(sc_die, pf); - - /* - * Continue if no error, because the lazy pattern will match - * to other lines - */ - return ret < 0 ? ret : 0; -} - -/* Find probe points from lazy pattern */ -static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) -{ - int ret = 0; - - if (list_empty(&pf->lcache)) { - /* Matching lazy line pattern */ - ret = find_lazy_match_lines(&pf->lcache, pf->fname, - pf->pev->point.lazy_line); - if (ret <= 0) - return ret; - } - - return die_walk_lines(sp_die, probe_point_lazy_walker, pf); -} - -static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) -{ - struct probe_finder *pf = data; - struct perf_probe_point *pp = &pf->pev->point; - Dwarf_Addr addr; - int ret; - - if (pp->lazy_line) - ret = find_probe_point_lazy(in_die, pf); - else { - /* Get probe address */ - if (dwarf_entrypc(in_die, &addr) != 0) { - pr_warning("Failed to get entry address of %s.\n", - dwarf_diename(in_die)); - return -ENOENT; - } - pf->addr = addr; - pf->addr += pp->offset; - pr_debug("found inline addr: 0x%jx\n", - (uintmax_t)pf->addr); - - ret = call_probe_finder(in_die, pf); - } - - return ret; -} - -/* Callback parameter with return value for libdw */ -struct dwarf_callback_param { - void *data; - int retval; -}; - -/* Search function from function name */ -static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) -{ - struct dwarf_callback_param *param = data; - struct probe_finder *pf = param->data; - struct perf_probe_point *pp = &pf->pev->point; - - /* Check tag and diename */ - if (!die_is_func_def(sp_die) || - !die_compare_name(sp_die, pp->function)) - return DWARF_CB_OK; - - /* Check declared file */ - if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) - return DWARF_CB_OK; - - pf->fname = dwarf_decl_file(sp_die); - if (pp->line) { /* Function relative line */ - dwarf_decl_line(sp_die, &pf->lno); - pf->lno += pp->line; - param->retval = find_probe_point_by_line(pf); - } else if (!dwarf_func_inline(sp_die)) { - /* Real function */ - if (pp->lazy_line) - param->retval = find_probe_point_lazy(sp_die, pf); - else { - if (dwarf_entrypc(sp_die, &pf->addr) != 0) { - pr_warning("Failed to get entry address of " - "%s.\n", dwarf_diename(sp_die)); - param->retval = -ENOENT; - return DWARF_CB_ABORT; - } - pf->addr += pp->offset; - /* TODO: Check the address in this function */ - param->retval = call_probe_finder(sp_die, pf); - } - } else - /* Inlined function: search instances */ - param->retval = die_walk_instances(sp_die, - probe_point_inline_cb, (void *)pf); - - return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ -} - -static int find_probe_point_by_func(struct probe_finder *pf) -{ - struct dwarf_callback_param _param = {.data = (void *)pf, - .retval = 0}; - dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); - return _param.retval; -} - -struct pubname_callback_param { - char *function; - char *file; - Dwarf_Die *cu_die; - Dwarf_Die *sp_die; - int found; -}; - -static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) -{ - struct pubname_callback_param *param = data; - - if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { - if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) - return DWARF_CB_OK; - - if (die_compare_name(param->sp_die, param->function)) { - if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) - return DWARF_CB_OK; - - if (param->file && - strtailcmp(param->file, dwarf_decl_file(param->sp_die))) - return DWARF_CB_OK; - - param->found = 1; - return DWARF_CB_ABORT; - } - } - - return DWARF_CB_OK; -} - -/* Find probe points from debuginfo */ -static int debuginfo__find_probes(struct debuginfo *self, - struct probe_finder *pf) -{ - struct perf_probe_point *pp = &pf->pev->point; - Dwarf_Off off, noff; - size_t cuhl; - Dwarf_Die *diep; - int ret = 0; - -#if _ELFUTILS_PREREQ(0, 142) - /* Get the call frame information from this dwarf */ - pf->cfi = dwarf_getcfi(self->dbg); -#endif - - off = 0; - line_list__init(&pf->lcache); - - /* Fastpath: lookup by function name from .debug_pubnames section */ - if (pp->function) { - struct pubname_callback_param pubname_param = { - .function = pp->function, - .file = pp->file, - .cu_die = &pf->cu_die, - .sp_die = &pf->sp_die, - .found = 0, - }; - struct dwarf_callback_param probe_param = { - .data = pf, - }; - - dwarf_getpubnames(self->dbg, pubname_search_cb, - &pubname_param, 0); - if (pubname_param.found) { - ret = probe_point_search_cb(&pf->sp_die, &probe_param); - if (ret) - goto found; - } - } - - /* Loop on CUs (Compilation Unit) */ - while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { - /* Get the DIE(Debugging Information Entry) of this CU */ - diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die); - if (!diep) - continue; - - /* Check if target file is included. */ - if (pp->file) - pf->fname = cu_find_realpath(&pf->cu_die, pp->file); - else - pf->fname = NULL; - - if (!pp->file || pf->fname) { - if (pp->function) - ret = find_probe_point_by_func(pf); - else if (pp->lazy_line) - ret = find_probe_point_lazy(NULL, pf); - else { - pf->lno = pp->line; - ret = find_probe_point_by_line(pf); - } - if (ret < 0) - break; - } - off = noff; - } - -found: - line_list__free(&pf->lcache); - - return ret; -} - -/* Add a found probe point into trace event list */ -static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) -{ - struct trace_event_finder *tf = - container_of(pf, struct trace_event_finder, pf); - struct probe_trace_event *tev; - int ret, i; - - /* Check number of tevs */ - if (tf->ntevs == tf->max_tevs) { - pr_warning("Too many( > %d) probe point found.\n", - tf->max_tevs); - return -ERANGE; - } - tev = &tf->tevs[tf->ntevs++]; - - /* Trace point should be converted from subprogram DIE */ - ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, - pf->pev->point.retprobe, &tev->point); - if (ret < 0) - return ret; - - pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, - tev->point.offset); - - /* Find each argument */ - tev->nargs = pf->pev->nargs; - tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); - if (tev->args == NULL) - return -ENOMEM; - for (i = 0; i < pf->pev->nargs; i++) { - pf->pvar = &pf->pev->args[i]; - pf->tvar = &tev->args[i]; - /* Variable should be found from scope DIE */ - ret = find_variable(sc_die, pf); - if (ret != 0) - return ret; - } - - return 0; -} - -/* Find probe_trace_events specified by perf_probe_event from debuginfo */ -int debuginfo__find_trace_events(struct debuginfo *self, - struct perf_probe_event *pev, - struct probe_trace_event **tevs, int max_tevs) -{ - struct trace_event_finder tf = { - .pf = {.pev = pev, .callback = add_probe_trace_event}, - .mod = self->mod, .max_tevs = max_tevs}; - int ret; - - /* Allocate result tevs array */ - *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); - if (*tevs == NULL) - return -ENOMEM; - - tf.tevs = *tevs; - tf.ntevs = 0; - - ret = debuginfo__find_probes(self, &tf.pf); - if (ret < 0) { - free(*tevs); - *tevs = NULL; - return ret; - } - - return (ret < 0) ? ret : tf.ntevs; -} - -#define MAX_VAR_LEN 64 - -/* Collect available variables in this scope */ -static int collect_variables_cb(Dwarf_Die *die_mem, void *data) -{ - struct available_var_finder *af = data; - struct variable_list *vl; - char buf[MAX_VAR_LEN]; - int tag, ret; - - vl = &af->vls[af->nvls - 1]; - - tag = dwarf_tag(die_mem); - if (tag == DW_TAG_formal_parameter || - tag == DW_TAG_variable) { - ret = convert_variable_location(die_mem, af->pf.addr, - af->pf.fb_ops, NULL); - if (ret == 0) { - ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); - pr_debug2("Add new var: %s\n", buf); - if (ret > 0) - strlist__add(vl->vars, buf); - } - } - - if (af->child && dwarf_haspc(die_mem, af->pf.addr)) - return DIE_FIND_CB_CONTINUE; - else - return DIE_FIND_CB_SIBLING; -} - -/* Add a found vars into available variables list */ -static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) -{ - struct available_var_finder *af = - container_of(pf, struct available_var_finder, pf); - struct variable_list *vl; - Dwarf_Die die_mem; - int ret; - - /* Check number of tevs */ - if (af->nvls == af->max_vls) { - pr_warning("Too many( > %d) probe point found.\n", af->max_vls); - return -ERANGE; - } - vl = &af->vls[af->nvls++]; - - /* Trace point should be converted from subprogram DIE */ - ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, - pf->pev->point.retprobe, &vl->point); - if (ret < 0) - return ret; - - pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, - vl->point.offset); - - /* Find local variables */ - vl->vars = strlist__new(true, NULL); - if (vl->vars == NULL) - return -ENOMEM; - af->child = true; - die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); - - /* Find external variables */ - if (!af->externs) - goto out; - /* Don't need to search child DIE for externs. */ - af->child = false; - die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); - -out: - if (strlist__empty(vl->vars)) { - strlist__delete(vl->vars); - vl->vars = NULL; - } - - return ret; -} - -/* Find available variables at given probe point */ -int debuginfo__find_available_vars_at(struct debuginfo *self, - struct perf_probe_event *pev, - struct variable_list **vls, - int max_vls, bool externs) -{ - struct available_var_finder af = { - .pf = {.pev = pev, .callback = add_available_vars}, - .mod = self->mod, - .max_vls = max_vls, .externs = externs}; - int ret; - - /* Allocate result vls array */ - *vls = zalloc(sizeof(struct variable_list) * max_vls); - if (*vls == NULL) - return -ENOMEM; - - af.vls = *vls; - af.nvls = 0; - - ret = debuginfo__find_probes(self, &af.pf); - if (ret < 0) { - /* Free vlist for error */ - while (af.nvls--) { - if (af.vls[af.nvls].point.symbol) - free(af.vls[af.nvls].point.symbol); - if (af.vls[af.nvls].vars) - strlist__delete(af.vls[af.nvls].vars); - } - free(af.vls); - *vls = NULL; - return ret; - } - - return (ret < 0) ? ret : af.nvls; -} - -/* Reverse search */ -int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr, - struct perf_probe_point *ppt) -{ - Dwarf_Die cudie, spdie, indie; - Dwarf_Addr _addr = 0, baseaddr = 0; - const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; - int baseline = 0, lineno = 0, ret = 0; - - /* Adjust address with bias */ - addr += self->bias; - - /* Find cu die */ - if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) { - pr_warning("Failed to find debug information for address %lx\n", - addr); - ret = -EINVAL; - goto end; - } - - /* Find a corresponding line (filename and lineno) */ - cu_find_lineinfo(&cudie, addr, &fname, &lineno); - /* Don't care whether it failed or not */ - - /* Find a corresponding function (name, baseline and baseaddr) */ - if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { - /* Get function entry information */ - func = basefunc = dwarf_diename(&spdie); - if (!func || - dwarf_entrypc(&spdie, &baseaddr) != 0 || - dwarf_decl_line(&spdie, &baseline) != 0) { - lineno = 0; - goto post; - } - - fname = dwarf_decl_file(&spdie); - if (addr == (unsigned long)baseaddr) { - /* Function entry - Relative line number is 0 */ - lineno = baseline; - goto post; - } - - /* Track down the inline functions step by step */ - while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, - &indie)) { - /* There is an inline function */ - if (dwarf_entrypc(&indie, &_addr) == 0 && - _addr == addr) { - /* - * addr is at an inline function entry. - * In this case, lineno should be the call-site - * line number. (overwrite lineinfo) - */ - lineno = die_get_call_lineno(&indie); - fname = die_get_call_file(&indie); - break; - } else { - /* - * addr is in an inline function body. - * Since lineno points one of the lines - * of the inline function, baseline should - * be the entry line of the inline function. - */ - tmp = dwarf_diename(&indie); - if (!tmp || - dwarf_decl_line(&indie, &baseline) != 0) - break; - func = tmp; - spdie = indie; - } - } - /* Verify the lineno and baseline are in a same file */ - tmp = dwarf_decl_file(&spdie); - if (!tmp || strcmp(tmp, fname) != 0) - lineno = 0; - } - -post: - /* Make a relative line number or an offset */ - if (lineno) - ppt->line = lineno - baseline; - else if (basefunc) { - ppt->offset = addr - (unsigned long)baseaddr; - func = basefunc; - } - - /* Duplicate strings */ - if (func) { - ppt->function = strdup(func); - if (ppt->function == NULL) { - ret = -ENOMEM; - goto end; - } - } - if (fname) { - ppt->file = strdup(fname); - if (ppt->file == NULL) { - if (ppt->function) { - free(ppt->function); - ppt->function = NULL; - } - ret = -ENOMEM; - goto end; - } - } -end: - if (ret == 0 && (fname || func)) - ret = 1; /* Found a point */ - return ret; -} - -/* Add a line and store the src path */ -static int line_range_add_line(const char *src, unsigned int lineno, - struct line_range *lr) -{ - /* Copy source path */ - if (!lr->path) { - lr->path = strdup(src); - if (lr->path == NULL) - return -ENOMEM; - } - return line_list__add_line(&lr->line_list, lineno); -} - -static int line_range_walk_cb(const char *fname, int lineno, - Dwarf_Addr addr __maybe_unused, - void *data) -{ - struct line_finder *lf = data; - - if ((strtailcmp(fname, lf->fname) != 0) || - (lf->lno_s > lineno || lf->lno_e < lineno)) - return 0; - - if (line_range_add_line(fname, lineno, lf->lr) < 0) - return -EINVAL; - - return 0; -} - -/* Find line range from its line number */ -static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) -{ - int ret; - - ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); - - /* Update status */ - if (ret >= 0) - if (!list_empty(&lf->lr->line_list)) - ret = lf->found = 1; - else - ret = 0; /* Lines are not found */ - else { - free(lf->lr->path); - lf->lr->path = NULL; - } - return ret; -} - -static int line_range_inline_cb(Dwarf_Die *in_die, void *data) -{ - find_line_range_by_line(in_die, data); - - /* - * We have to check all instances of inlined function, because - * some execution paths can be optimized out depends on the - * function argument of instances - */ - return 0; -} - -/* Search function definition from function name */ -static int line_range_search_cb(Dwarf_Die *sp_die, void *data) -{ - struct dwarf_callback_param *param = data; - struct line_finder *lf = param->data; - struct line_range *lr = lf->lr; - - /* Check declared file */ - if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) - return DWARF_CB_OK; - - if (die_is_func_def(sp_die) && - die_compare_name(sp_die, lr->function)) { - lf->fname = dwarf_decl_file(sp_die); - dwarf_decl_line(sp_die, &lr->offset); - pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); - lf->lno_s = lr->offset + lr->start; - if (lf->lno_s < 0) /* Overflow */ - lf->lno_s = INT_MAX; - lf->lno_e = lr->offset + lr->end; - if (lf->lno_e < 0) /* Overflow */ - lf->lno_e = INT_MAX; - pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); - lr->start = lf->lno_s; - lr->end = lf->lno_e; - if (dwarf_func_inline(sp_die)) - param->retval = die_walk_instances(sp_die, - line_range_inline_cb, lf); - else - param->retval = find_line_range_by_line(sp_die, lf); - return DWARF_CB_ABORT; - } - return DWARF_CB_OK; -} - -static int find_line_range_by_func(struct line_finder *lf) -{ - struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; - dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); - return param.retval; -} - -int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr) -{ - struct line_finder lf = {.lr = lr, .found = 0}; - int ret = 0; - Dwarf_Off off = 0, noff; - size_t cuhl; - Dwarf_Die *diep; - const char *comp_dir; - - /* Fastpath: lookup by function name from .debug_pubnames section */ - if (lr->function) { - struct pubname_callback_param pubname_param = { - .function = lr->function, .file = lr->file, - .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; - struct dwarf_callback_param line_range_param = { - .data = (void *)&lf, .retval = 0}; - - dwarf_getpubnames(self->dbg, pubname_search_cb, - &pubname_param, 0); - if (pubname_param.found) { - line_range_search_cb(&lf.sp_die, &line_range_param); - if (lf.found) - goto found; - } - } - - /* Loop on CUs (Compilation Unit) */ - while (!lf.found && ret >= 0) { - if (dwarf_nextcu(self->dbg, off, &noff, &cuhl, - NULL, NULL, NULL) != 0) - break; - - /* Get the DIE(Debugging Information Entry) of this CU */ - diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die); - if (!diep) - continue; - - /* Check if target file is included. */ - if (lr->file) - lf.fname = cu_find_realpath(&lf.cu_die, lr->file); - else - lf.fname = 0; - - if (!lr->file || lf.fname) { - if (lr->function) - ret = find_line_range_by_func(&lf); - else { - lf.lno_s = lr->start; - lf.lno_e = lr->end; - ret = find_line_range_by_line(NULL, &lf); - } - } - off = noff; - } - -found: - /* Store comp_dir */ - if (lf.found) { - comp_dir = cu_get_comp_dir(&lf.cu_die); - if (comp_dir) { - lr->comp_dir = strdup(comp_dir); - if (!lr->comp_dir) - ret = -ENOMEM; - } - } - - pr_debug("path: %s\n", lr->path); - return (ret < 0) ? ret : lf.found; -} - |