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-rw-r--r--tools/perf/util/symbol.c199
1 files changed, 149 insertions, 50 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 5c0f42e6b33b..fd3d9c8e90fc 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -3,6 +3,8 @@
#include "string.h"
#include "symbol.h"
+#include "debug.h"
+
#include <libelf.h>
#include <gelf.h>
#include <elf.h>
@@ -21,7 +23,7 @@ enum dso_origin {
static struct symbol *symbol__new(u64 start, u64 len,
const char *name, unsigned int priv_size,
- u64 obj_start, int verbose)
+ u64 obj_start, int v)
{
size_t namelen = strlen(name) + 1;
struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
@@ -29,7 +31,7 @@ static struct symbol *symbol__new(u64 start, u64 len,
if (!self)
return NULL;
- if (verbose >= 2)
+ if (v >= 2)
printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
(u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
@@ -156,7 +158,7 @@ size_t dso__fprintf(struct dso *self, FILE *fp)
return ret;
}
-static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verbose)
+static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
{
struct rb_node *nd, *prevnd;
char *line = NULL;
@@ -198,7 +200,7 @@ static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verb
* Well fix up the end later, when we have all sorted.
*/
sym = symbol__new(start, 0xdead, line + len + 2,
- self->sym_priv_size, 0, verbose);
+ self->sym_priv_size, 0, v);
if (sym == NULL)
goto out_delete_line;
@@ -239,7 +241,7 @@ out_failure:
return -1;
}
-static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verbose)
+static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int v)
{
char *line = NULL;
size_t n;
@@ -277,7 +279,7 @@ static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verb
continue;
sym = symbol__new(start, size, line + len,
- self->sym_priv_size, start, verbose);
+ self->sym_priv_size, start, v);
if (sym == NULL)
goto out_delete_line;
@@ -305,13 +307,13 @@ out_failure:
* elf_symtab__for_each_symbol - iterate thru all the symbols
*
* @self: struct elf_symtab instance to iterate
- * @index: uint32_t index
+ * @idx: uint32_t idx
* @sym: GElf_Sym iterator
*/
-#define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
- for (index = 0, gelf_getsym(syms, index, &sym);\
- index < nr_syms; \
- index++, gelf_getsym(syms, index, &sym))
+#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
+ for (idx = 0, gelf_getsym(syms, idx, &sym);\
+ idx < nr_syms; \
+ idx++, gelf_getsym(syms, idx, &sym))
static inline uint8_t elf_sym__type(const GElf_Sym *sym)
{
@@ -354,7 +356,7 @@ static inline const char *elf_sym__name(const GElf_Sym *sym,
static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
GElf_Shdr *shp, const char *name,
- size_t *index)
+ size_t *idx)
{
Elf_Scn *sec = NULL;
size_t cnt = 1;
@@ -365,8 +367,8 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
gelf_getshdr(sec, shp);
str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
if (!strcmp(name, str)) {
- if (index)
- *index = cnt;
+ if (idx)
+ *idx = cnt;
break;
}
++cnt;
@@ -392,7 +394,7 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
* And always look at the original dso, not at debuginfo packages, that
* have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
*/
-static int dso__synthesize_plt_symbols(struct dso *self, int verbose)
+static int dso__synthesize_plt_symbols(struct dso *self, int v)
{
uint32_t nr_rel_entries, idx;
GElf_Sym sym;
@@ -442,7 +444,7 @@ static int dso__synthesize_plt_symbols(struct dso *self, int verbose)
goto out_elf_end;
/*
- * Fetch the relocation section to find the indexes to the GOT
+ * Fetch the relocation section to find the idxes to the GOT
* and the symbols in the .dynsym they refer to.
*/
reldata = elf_getdata(scn_plt_rel, NULL);
@@ -476,7 +478,7 @@ static int dso__synthesize_plt_symbols(struct dso *self, int verbose)
"%s@plt", elf_sym__name(&sym, symstrs));
f = symbol__new(plt_offset, shdr_plt.sh_entsize,
- sympltname, self->sym_priv_size, 0, verbose);
+ sympltname, self->sym_priv_size, 0, v);
if (!f)
goto out_elf_end;
@@ -494,7 +496,7 @@ static int dso__synthesize_plt_symbols(struct dso *self, int verbose)
"%s@plt", elf_sym__name(&sym, symstrs));
f = symbol__new(plt_offset, shdr_plt.sh_entsize,
- sympltname, self->sym_priv_size, 0, verbose);
+ sympltname, self->sym_priv_size, 0, v);
if (!f)
goto out_elf_end;
@@ -518,12 +520,12 @@ out:
}
static int dso__load_sym(struct dso *self, int fd, const char *name,
- symbol_filter_t filter, int verbose, struct module *mod)
+ symbol_filter_t filter, int v, struct module *mod)
{
Elf_Data *symstrs, *secstrs;
uint32_t nr_syms;
int err = -1;
- uint32_t index;
+ uint32_t idx;
GElf_Ehdr ehdr;
GElf_Shdr shdr;
Elf_Data *syms;
@@ -534,14 +536,14 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL) {
- if (verbose)
+ if (v)
fprintf(stderr, "%s: cannot read %s ELF file.\n",
__func__, name);
goto out_close;
}
if (gelf_getehdr(elf, &ehdr) == NULL) {
- if (verbose)
+ if (v)
fprintf(stderr, "%s: cannot get elf header.\n", __func__);
goto out_elf_end;
}
@@ -583,9 +585,9 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
NULL) != NULL);
} else self->adjust_symbols = 0;
- elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
+ elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
struct symbol *f;
- const char *name;
+ const char *elf_name;
char *demangled;
u64 obj_start;
struct section *section = NULL;
@@ -608,7 +610,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
obj_start = sym.st_value;
if (self->adjust_symbols) {
- if (verbose >= 2)
+ if (v >= 2)
printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
(u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
@@ -630,13 +632,13 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
* DWARF DW_compile_unit has this, but we don't always have access
* to it...
*/
- name = elf_sym__name(&sym, symstrs);
- demangled = bfd_demangle(NULL, name, DMGL_PARAMS | DMGL_ANSI);
+ elf_name = elf_sym__name(&sym, symstrs);
+ demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
if (demangled != NULL)
- name = demangled;
+ elf_name = demangled;
- f = symbol__new(sym.st_value, sym.st_size, name,
- self->sym_priv_size, obj_start, verbose);
+ f = symbol__new(sym.st_value, sym.st_size, elf_name,
+ self->sym_priv_size, obj_start, v);
free(demangled);
if (!f)
goto out_elf_end;
@@ -659,7 +661,7 @@ out_close:
#define BUILD_ID_SIZE 128
-static char *dso__read_build_id(struct dso *self, int verbose)
+static char *dso__read_build_id(struct dso *self, int v)
{
int i;
GElf_Ehdr ehdr;
@@ -676,14 +678,14 @@ static char *dso__read_build_id(struct dso *self, int verbose)
elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL) {
- if (verbose)
+ if (v)
fprintf(stderr, "%s: cannot read %s ELF file.\n",
__func__, self->name);
goto out_close;
}
if (gelf_getehdr(elf, &ehdr) == NULL) {
- if (verbose)
+ if (v)
fprintf(stderr, "%s: cannot get elf header.\n", __func__);
goto out_elf_end;
}
@@ -706,7 +708,7 @@ static char *dso__read_build_id(struct dso *self, int verbose)
++raw;
bid += 2;
}
- if (verbose >= 2)
+ if (v >= 2)
printf("%s(%s): %s\n", __func__, self->name, build_id);
out_elf_end:
elf_end(elf);
@@ -732,7 +734,7 @@ char dso__symtab_origin(const struct dso *self)
return origin[self->origin];
}
-int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
+int dso__load(struct dso *self, symbol_filter_t filter, int v)
{
int size = PATH_MAX;
char *name = malloc(size), *build_id = NULL;
@@ -745,7 +747,7 @@ int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
self->adjust_symbols = 0;
if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
- ret = dso__load_perf_map(self, filter, verbose);
+ ret = dso__load_perf_map(self, filter, v);
self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
DSO__ORIG_NOT_FOUND;
return ret;
@@ -764,7 +766,7 @@ more:
snprintf(name, size, "/usr/lib/debug%s", self->name);
break;
case DSO__ORIG_BUILDID:
- build_id = dso__read_build_id(self, verbose);
+ build_id = dso__read_build_id(self, v);
if (build_id != NULL) {
snprintf(name, size,
"/usr/lib/debug/.build-id/%.2s/%s.debug",
@@ -785,7 +787,7 @@ more:
fd = open(name, O_RDONLY);
} while (fd < 0);
- ret = dso__load_sym(self, fd, name, filter, verbose, NULL);
+ ret = dso__load_sym(self, fd, name, filter, v, NULL);
close(fd);
/*
@@ -795,7 +797,7 @@ more:
goto more;
if (ret > 0) {
- int nr_plt = dso__synthesize_plt_symbols(self, verbose);
+ int nr_plt = dso__synthesize_plt_symbols(self, v);
if (nr_plt > 0)
ret += nr_plt;
}
@@ -807,7 +809,7 @@ out:
}
static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
- symbol_filter_t filter, int verbose)
+ symbol_filter_t filter, int v)
{
struct module *mod = mod_dso__find_module(mods, name);
int err = 0, fd;
@@ -820,13 +822,13 @@ static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *
if (fd < 0)
return err;
- err = dso__load_sym(self, fd, name, filter, verbose, mod);
+ err = dso__load_sym(self, fd, name, filter, v, mod);
close(fd);
return err;
}
-int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
+int dso__load_modules(struct dso *self, symbol_filter_t filter, int v)
{
struct mod_dso *mods = mod_dso__new_dso("modules");
struct module *pos;
@@ -844,7 +846,7 @@ int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
next = rb_first(&mods->mods);
while (next) {
pos = rb_entry(next, struct module, rb_node);
- err = dso__load_module(self, mods, pos->name, filter, verbose);
+ err = dso__load_module(self, mods, pos->name, filter, v);
if (err < 0)
break;
@@ -887,14 +889,14 @@ static inline void dso__fill_symbol_holes(struct dso *self)
}
static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
- symbol_filter_t filter, int verbose)
+ symbol_filter_t filter, int v)
{
int err, fd = open(vmlinux, O_RDONLY);
if (fd < 0)
return -1;
- err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL);
+ err = dso__load_sym(self, fd, vmlinux, filter, v, NULL);
if (err > 0)
dso__fill_symbol_holes(self);
@@ -905,18 +907,18 @@ static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
}
int dso__load_kernel(struct dso *self, const char *vmlinux,
- symbol_filter_t filter, int verbose, int modules)
+ symbol_filter_t filter, int v, int use_modules)
{
int err = -1;
if (vmlinux) {
- err = dso__load_vmlinux(self, vmlinux, filter, verbose);
- if (err > 0 && modules)
- err = dso__load_modules(self, filter, verbose);
+ err = dso__load_vmlinux(self, vmlinux, filter, v);
+ if (err > 0 && use_modules)
+ err = dso__load_modules(self, filter, v);
}
if (err <= 0)
- err = dso__load_kallsyms(self, filter, verbose);
+ err = dso__load_kallsyms(self, filter, v);
if (err > 0)
self->origin = DSO__ORIG_KERNEL;
@@ -924,6 +926,103 @@ int dso__load_kernel(struct dso *self, const char *vmlinux,
return err;
}
+LIST_HEAD(dsos);
+struct dso *kernel_dso;
+struct dso *vdso;
+struct dso *hypervisor_dso;
+
+const char *vmlinux_name = "vmlinux";
+int modules;
+
+static void dsos__add(struct dso *dso)
+{
+ list_add_tail(&dso->node, &dsos);
+}
+
+static struct dso *dsos__find(const char *name)
+{
+ struct dso *pos;
+
+ list_for_each_entry(pos, &dsos, node)
+ if (strcmp(pos->name, name) == 0)
+ return pos;
+ return NULL;
+}
+
+struct dso *dsos__findnew(const char *name)
+{
+ struct dso *dso = dsos__find(name);
+ int nr;
+
+ if (dso)
+ return dso;
+
+ dso = dso__new(name, 0);
+ if (!dso)
+ goto out_delete_dso;
+
+ nr = dso__load(dso, NULL, verbose);
+ if (nr < 0) {
+ eprintf("Failed to open: %s\n", name);
+ goto out_delete_dso;
+ }
+ if (!nr)
+ eprintf("No symbols found in: %s, maybe install a debug package?\n", name);
+
+ dsos__add(dso);
+
+ return dso;
+
+out_delete_dso:
+ dso__delete(dso);
+ return NULL;
+}
+
+void dsos__fprintf(FILE *fp)
+{
+ struct dso *pos;
+
+ list_for_each_entry(pos, &dsos, node)
+ dso__fprintf(pos, fp);
+}
+
+static struct symbol *vdso__find_symbol(struct dso *dso, u64 ip)
+{
+ return dso__find_symbol(dso, ip);
+}
+
+int load_kernel(void)
+{
+ int err;
+
+ kernel_dso = dso__new("[kernel]", 0);
+ if (!kernel_dso)
+ return -1;
+
+ err = dso__load_kernel(kernel_dso, vmlinux_name, NULL, verbose, modules);
+ if (err <= 0) {
+ dso__delete(kernel_dso);
+ kernel_dso = NULL;
+ } else
+ dsos__add(kernel_dso);
+
+ vdso = dso__new("[vdso]", 0);
+ if (!vdso)
+ return -1;
+
+ vdso->find_symbol = vdso__find_symbol;
+
+ dsos__add(vdso);
+
+ hypervisor_dso = dso__new("[hypervisor]", 0);
+ if (!hypervisor_dso)
+ return -1;
+ dsos__add(hypervisor_dso);
+
+ return err;
+}
+
+
void symbol__init(void)
{
elf_version(EV_CURRENT);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.