mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 06:55:13 +08:00
d944c4eebc
Combine all definitions into a common tools/include/linux/types.h and kill the wild growth elsewhere. Move DECLARE_BITMAP to its proper bitmap.h header. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Link: http://lkml.kernel.org/n/tip-azczs7qcv6h9xek9od10hiv2@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
211 lines
4.5 KiB
C
211 lines
4.5 KiB
C
#include <linux/compiler.h>
|
|
#include <elfutils/libdw.h>
|
|
#include <elfutils/libdwfl.h>
|
|
#include <inttypes.h>
|
|
#include <errno.h>
|
|
#include "unwind.h"
|
|
#include "unwind-libdw.h"
|
|
#include "machine.h"
|
|
#include "thread.h"
|
|
#include <linux/types.h>
|
|
#include "event.h"
|
|
#include "perf_regs.h"
|
|
|
|
static char *debuginfo_path;
|
|
|
|
static const Dwfl_Callbacks offline_callbacks = {
|
|
.find_debuginfo = dwfl_standard_find_debuginfo,
|
|
.debuginfo_path = &debuginfo_path,
|
|
.section_address = dwfl_offline_section_address,
|
|
};
|
|
|
|
static int __report_module(struct addr_location *al, u64 ip,
|
|
struct unwind_info *ui)
|
|
{
|
|
Dwfl_Module *mod;
|
|
struct dso *dso = NULL;
|
|
|
|
thread__find_addr_location(ui->thread, ui->machine,
|
|
PERF_RECORD_MISC_USER,
|
|
MAP__FUNCTION, ip, al);
|
|
|
|
if (al->map)
|
|
dso = al->map->dso;
|
|
|
|
if (!dso)
|
|
return 0;
|
|
|
|
mod = dwfl_addrmodule(ui->dwfl, ip);
|
|
if (!mod)
|
|
mod = dwfl_report_elf(ui->dwfl, dso->short_name,
|
|
dso->long_name, -1, al->map->start,
|
|
false);
|
|
|
|
return mod && dwfl_addrmodule(ui->dwfl, ip) == mod ? 0 : -1;
|
|
}
|
|
|
|
static int report_module(u64 ip, struct unwind_info *ui)
|
|
{
|
|
struct addr_location al;
|
|
|
|
return __report_module(&al, ip, ui);
|
|
}
|
|
|
|
static int entry(u64 ip, struct unwind_info *ui)
|
|
|
|
{
|
|
struct unwind_entry e;
|
|
struct addr_location al;
|
|
|
|
if (__report_module(&al, ip, ui))
|
|
return -1;
|
|
|
|
e.ip = ip;
|
|
e.map = al.map;
|
|
e.sym = al.sym;
|
|
|
|
pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
|
|
al.sym ? al.sym->name : "''",
|
|
ip,
|
|
al.map ? al.map->map_ip(al.map, ip) : (u64) 0);
|
|
|
|
return ui->cb(&e, ui->arg);
|
|
}
|
|
|
|
static pid_t next_thread(Dwfl *dwfl, void *arg, void **thread_argp)
|
|
{
|
|
/* We want only single thread to be processed. */
|
|
if (*thread_argp != NULL)
|
|
return 0;
|
|
|
|
*thread_argp = arg;
|
|
return dwfl_pid(dwfl);
|
|
}
|
|
|
|
static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
|
|
Dwarf_Word *data)
|
|
{
|
|
struct addr_location al;
|
|
ssize_t size;
|
|
|
|
thread__find_addr_map(ui->thread, ui->machine, PERF_RECORD_MISC_USER,
|
|
MAP__FUNCTION, addr, &al);
|
|
if (!al.map) {
|
|
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
|
|
return -1;
|
|
}
|
|
|
|
if (!al.map->dso)
|
|
return -1;
|
|
|
|
size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
|
|
addr, (u8 *) data, sizeof(*data));
|
|
|
|
return !(size == sizeof(*data));
|
|
}
|
|
|
|
static bool memory_read(Dwfl *dwfl __maybe_unused, Dwarf_Addr addr, Dwarf_Word *result,
|
|
void *arg)
|
|
{
|
|
struct unwind_info *ui = arg;
|
|
struct stack_dump *stack = &ui->sample->user_stack;
|
|
u64 start, end;
|
|
int offset;
|
|
int ret;
|
|
|
|
ret = perf_reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
|
|
if (ret)
|
|
return false;
|
|
|
|
end = start + stack->size;
|
|
|
|
/* Check overflow. */
|
|
if (addr + sizeof(Dwarf_Word) < addr)
|
|
return false;
|
|
|
|
if (addr < start || addr + sizeof(Dwarf_Word) > end) {
|
|
ret = access_dso_mem(ui, addr, result);
|
|
if (ret) {
|
|
pr_debug("unwind: access_mem 0x%" PRIx64 " not inside range"
|
|
" 0x%" PRIx64 "-0x%" PRIx64 "\n",
|
|
addr, start, end);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
offset = addr - start;
|
|
*result = *(Dwarf_Word *)&stack->data[offset];
|
|
pr_debug("unwind: access_mem addr 0x%" PRIx64 ", val %lx, offset %d\n",
|
|
addr, (unsigned long)*result, offset);
|
|
return true;
|
|
}
|
|
|
|
static const Dwfl_Thread_Callbacks callbacks = {
|
|
.next_thread = next_thread,
|
|
.memory_read = memory_read,
|
|
.set_initial_registers = libdw__arch_set_initial_registers,
|
|
};
|
|
|
|
static int
|
|
frame_callback(Dwfl_Frame *state, void *arg)
|
|
{
|
|
struct unwind_info *ui = arg;
|
|
Dwarf_Addr pc;
|
|
|
|
if (!dwfl_frame_pc(state, &pc, NULL)) {
|
|
pr_err("%s", dwfl_errmsg(-1));
|
|
return DWARF_CB_ABORT;
|
|
}
|
|
|
|
return entry(pc, ui) || !(--ui->max_stack) ?
|
|
DWARF_CB_ABORT : DWARF_CB_OK;
|
|
}
|
|
|
|
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
|
|
struct machine *machine, struct thread *thread,
|
|
struct perf_sample *data,
|
|
int max_stack)
|
|
{
|
|
struct unwind_info ui = {
|
|
.sample = data,
|
|
.thread = thread,
|
|
.machine = machine,
|
|
.cb = cb,
|
|
.arg = arg,
|
|
.max_stack = max_stack,
|
|
};
|
|
Dwarf_Word ip;
|
|
int err = -EINVAL;
|
|
|
|
if (!data->user_regs.regs)
|
|
return -EINVAL;
|
|
|
|
ui.dwfl = dwfl_begin(&offline_callbacks);
|
|
if (!ui.dwfl)
|
|
goto out;
|
|
|
|
err = perf_reg_value(&ip, &data->user_regs, PERF_REG_IP);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = report_module(ip, &ui);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!dwfl_attach_state(ui.dwfl, EM_NONE, thread->tid, &callbacks, &ui))
|
|
goto out;
|
|
|
|
err = dwfl_getthread_frames(ui.dwfl, thread->tid, frame_callback, &ui);
|
|
|
|
if (err && !ui.max_stack)
|
|
err = 0;
|
|
|
|
out:
|
|
if (err)
|
|
pr_debug("unwind: failed with '%s'\n", dwfl_errmsg(-1));
|
|
|
|
dwfl_end(ui.dwfl);
|
|
return 0;
|
|
}
|