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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Cody P Schafer](/assets/img/avatar_default.png)
We keep both a 'runtime' elf image as well as a 'debug' elf image around and generate symbols by looking at both of these. This eliminates the need for the want_symtab/goto restart mechanism combined with iterating over and reopening the elf images a second time. Also give dso__synthsize_plt_symbols() the runtime image (which has dynsyms) instead of the symbol image (which may only have a symtab and no dynsyms). Previously if a debug image was found all runtime images were ignored. This fixes 2 issues: - Symbol resolution to failure on PowerPC systems with debug symbols installed, as the debug images lack a '.opd' section which contains function descriptors. - On all archs, plt synthesis failed when a debug image was loaded and that debug image lacks a dynsym section while a runtime image has a dynsym section. Assumptions: - If a .opd section exists, it is contained in the highest priority image with a dynsym section. - This generally implies that the debug image lacks a dynsym section (ie: it is marked as NO_BITS). Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Cc: David Hansen <dave@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Matt Hellsley <matthltc@us.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1344637382-22789-17-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
384 lines
10 KiB
C
384 lines
10 KiB
C
#ifndef __PERF_SYMBOL
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#define __PERF_SYMBOL 1
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#include <linux/types.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "map.h"
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#include "../perf.h"
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include <stdio.h>
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#include <byteswap.h>
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#ifndef NO_LIBELF_SUPPORT
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#include <libelf.h>
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#include <gelf.h>
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#include <elf.h>
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#endif
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#ifdef HAVE_CPLUS_DEMANGLE
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extern char *cplus_demangle(const char *, int);
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static inline char *bfd_demangle(void __used *v, const char *c, int i)
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{
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return cplus_demangle(c, i);
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}
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#else
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#ifdef NO_DEMANGLE
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static inline char *bfd_demangle(void __used *v, const char __used *c,
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int __used i)
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{
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return NULL;
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}
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#else
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#include <bfd.h>
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#endif
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#endif
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int hex2u64(const char *ptr, u64 *val);
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char *strxfrchar(char *s, char from, char to);
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/*
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* libelf 0.8.x and earlier do not support ELF_C_READ_MMAP;
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* for newer versions we can use mmap to reduce memory usage:
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*/
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#ifdef LIBELF_NO_MMAP
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# define PERF_ELF_C_READ_MMAP ELF_C_READ
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#else
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# define PERF_ELF_C_READ_MMAP ELF_C_READ_MMAP
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#endif
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#ifndef DMGL_PARAMS
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#define DMGL_PARAMS (1 << 0) /* Include function args */
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#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
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#endif
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#define BUILD_ID_SIZE 20
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/** struct symbol - symtab entry
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*
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* @ignore - resolvable but tools ignore it (e.g. idle routines)
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*/
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struct symbol {
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struct rb_node rb_node;
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u64 start;
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u64 end;
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u16 namelen;
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u8 binding;
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bool ignore;
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char name[0];
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};
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void symbol__delete(struct symbol *sym);
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static inline size_t symbol__size(const struct symbol *sym)
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{
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return sym->end - sym->start + 1;
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}
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struct strlist;
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struct symbol_conf {
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unsigned short priv_size;
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unsigned short nr_events;
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bool try_vmlinux_path,
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show_kernel_path,
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use_modules,
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sort_by_name,
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show_nr_samples,
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show_total_period,
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use_callchain,
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exclude_other,
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show_cpu_utilization,
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initialized,
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kptr_restrict,
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annotate_asm_raw,
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annotate_src;
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const char *vmlinux_name,
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*kallsyms_name,
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*source_prefix,
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*field_sep;
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const char *default_guest_vmlinux_name,
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*default_guest_kallsyms,
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*default_guest_modules;
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const char *guestmount;
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const char *dso_list_str,
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*comm_list_str,
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*sym_list_str,
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*col_width_list_str;
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struct strlist *dso_list,
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*comm_list,
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*sym_list,
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*dso_from_list,
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*dso_to_list,
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*sym_from_list,
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*sym_to_list;
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const char *symfs;
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};
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extern struct symbol_conf symbol_conf;
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static inline void *symbol__priv(struct symbol *sym)
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{
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return ((void *)sym) - symbol_conf.priv_size;
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}
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struct ref_reloc_sym {
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const char *name;
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u64 addr;
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u64 unrelocated_addr;
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};
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struct map_symbol {
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struct map *map;
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struct symbol *sym;
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bool unfolded;
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bool has_children;
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};
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struct addr_map_symbol {
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struct map *map;
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struct symbol *sym;
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u64 addr;
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u64 al_addr;
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};
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struct branch_info {
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struct addr_map_symbol from;
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struct addr_map_symbol to;
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struct branch_flags flags;
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};
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struct addr_location {
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struct thread *thread;
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struct map *map;
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struct symbol *sym;
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u64 addr;
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char level;
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bool filtered;
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u8 cpumode;
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s32 cpu;
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};
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enum dso_binary_type {
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DSO_BINARY_TYPE__KALLSYMS = 0,
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DSO_BINARY_TYPE__GUEST_KALLSYMS,
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DSO_BINARY_TYPE__VMLINUX,
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DSO_BINARY_TYPE__GUEST_VMLINUX,
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DSO_BINARY_TYPE__JAVA_JIT,
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DSO_BINARY_TYPE__DEBUGLINK,
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DSO_BINARY_TYPE__BUILD_ID_CACHE,
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DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
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DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
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DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
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DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
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DSO_BINARY_TYPE__GUEST_KMODULE,
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DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
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DSO_BINARY_TYPE__NOT_FOUND,
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};
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enum dso_kernel_type {
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DSO_TYPE_USER = 0,
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DSO_TYPE_KERNEL,
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DSO_TYPE_GUEST_KERNEL
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};
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enum dso_swap_type {
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DSO_SWAP__UNSET,
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DSO_SWAP__NO,
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DSO_SWAP__YES,
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};
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#define DSO__DATA_CACHE_SIZE 4096
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#define DSO__DATA_CACHE_MASK ~(DSO__DATA_CACHE_SIZE - 1)
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struct dso_cache {
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struct rb_node rb_node;
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u64 offset;
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u64 size;
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char data[0];
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};
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struct dso {
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struct list_head node;
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struct rb_root symbols[MAP__NR_TYPES];
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struct rb_root symbol_names[MAP__NR_TYPES];
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struct rb_root cache;
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enum dso_kernel_type kernel;
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enum dso_swap_type needs_swap;
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enum dso_binary_type symtab_type;
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enum dso_binary_type data_type;
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u8 adjust_symbols:1;
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u8 has_build_id:1;
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u8 hit:1;
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u8 annotate_warned:1;
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u8 sname_alloc:1;
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u8 lname_alloc:1;
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u8 sorted_by_name;
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u8 loaded;
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u8 build_id[BUILD_ID_SIZE];
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const char *short_name;
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char *long_name;
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u16 long_name_len;
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u16 short_name_len;
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char name[0];
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};
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struct symsrc {
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char *name;
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int fd;
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enum dso_binary_type type;
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#ifndef NO_LIBELF_SUPPORT
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Elf *elf;
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GElf_Ehdr ehdr;
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Elf_Scn *opdsec;
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size_t opdidx;
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GElf_Shdr opdshdr;
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Elf_Scn *symtab;
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GElf_Shdr symshdr;
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Elf_Scn *dynsym;
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size_t dynsym_idx;
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GElf_Shdr dynshdr;
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bool adjust_symbols;
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#endif
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};
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void symsrc__destroy(struct symsrc *ss);
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int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
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enum dso_binary_type type);
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bool symsrc__has_symtab(struct symsrc *ss);
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bool symsrc__possibly_runtime(struct symsrc *ss);
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#define DSO__SWAP(dso, type, val) \
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({ \
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type ____r = val; \
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BUG_ON(dso->needs_swap == DSO_SWAP__UNSET); \
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if (dso->needs_swap == DSO_SWAP__YES) { \
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switch (sizeof(____r)) { \
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case 2: \
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____r = bswap_16(val); \
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break; \
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case 4: \
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____r = bswap_32(val); \
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break; \
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case 8: \
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____r = bswap_64(val); \
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break; \
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default: \
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BUG_ON(1); \
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} \
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} \
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____r; \
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})
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struct dso *dso__new(const char *name);
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void dso__delete(struct dso *dso);
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int dso__name_len(const struct dso *dso);
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bool dso__loaded(const struct dso *dso, enum map_type type);
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bool dso__sorted_by_name(const struct dso *dso, enum map_type type);
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static inline void dso__set_loaded(struct dso *dso, enum map_type type)
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{
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dso->loaded |= (1 << type);
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}
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void dso__sort_by_name(struct dso *dso, enum map_type type);
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void dsos__add(struct list_head *head, struct dso *dso);
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struct dso *__dsos__findnew(struct list_head *head, const char *name);
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int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter);
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int dso__load_vmlinux(struct dso *dso, struct map *map,
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const char *vmlinux, symbol_filter_t filter);
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int dso__load_vmlinux_path(struct dso *dso, struct map *map,
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symbol_filter_t filter);
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int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
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symbol_filter_t filter);
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int machine__load_kallsyms(struct machine *machine, const char *filename,
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enum map_type type, symbol_filter_t filter);
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int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
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symbol_filter_t filter);
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size_t __dsos__fprintf(struct list_head *head, FILE *fp);
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size_t machine__fprintf_dsos_buildid(struct machine *machine,
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FILE *fp, bool with_hits);
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size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp);
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size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
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FILE *fp, bool with_hits);
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size_t dso__fprintf_buildid(struct dso *dso, FILE *fp);
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size_t dso__fprintf_symbols_by_name(struct dso *dso,
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enum map_type type, FILE *fp);
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size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp);
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char dso__symtab_origin(const struct dso *dso);
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void dso__set_long_name(struct dso *dso, char *name);
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void dso__set_build_id(struct dso *dso, void *build_id);
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bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
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void dso__read_running_kernel_build_id(struct dso *dso,
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struct machine *machine);
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struct map *dso__new_map(const char *name);
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struct symbol *dso__find_symbol(struct dso *dso, enum map_type type,
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u64 addr);
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struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
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const char *name);
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int filename__read_build_id(const char *filename, void *bf, size_t size);
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int sysfs__read_build_id(const char *filename, void *bf, size_t size);
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bool __dsos__read_build_ids(struct list_head *head, bool with_hits);
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int build_id__sprintf(const u8 *build_id, int len, char *bf);
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int kallsyms__parse(const char *filename, void *arg,
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int (*process_symbol)(void *arg, const char *name,
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char type, u64 start));
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int filename__read_debuglink(const char *filename, char *debuglink,
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size_t size);
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void machine__destroy_kernel_maps(struct machine *machine);
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int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel);
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int machine__create_kernel_maps(struct machine *machine);
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int machines__create_kernel_maps(struct rb_root *machines, pid_t pid);
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int machines__create_guest_kernel_maps(struct rb_root *machines);
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void machines__destroy_guest_kernel_maps(struct rb_root *machines);
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int symbol__init(void);
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void symbol__exit(void);
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void symbol__elf_init(void);
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struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name);
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size_t symbol__fprintf_symname_offs(const struct symbol *sym,
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const struct addr_location *al, FILE *fp);
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size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp);
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bool symbol_type__is_a(char symbol_type, enum map_type map_type);
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size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);
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int dso__binary_type_file(struct dso *dso, enum dso_binary_type type,
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char *root_dir, char *file, size_t size);
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int dso__data_fd(struct dso *dso, struct machine *machine);
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ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
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u64 offset, u8 *data, ssize_t size);
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ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
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struct machine *machine, u64 addr,
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u8 *data, ssize_t size);
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int dso__test_data(void);
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int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
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struct symsrc *runtime_ss, symbol_filter_t filter,
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int kmodule);
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int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss,
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struct map *map, symbol_filter_t filter);
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void symbols__insert(struct rb_root *symbols, struct symbol *sym);
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void symbols__fixup_duplicate(struct rb_root *symbols);
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void symbols__fixup_end(struct rb_root *symbols);
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void __map_groups__fixup_end(struct map_groups *mg, enum map_type type);
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#endif /* __PERF_SYMBOL */
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