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#include <linux/compiler.h>
#include <elfutils/libdw.h>
#include <elfutils/libdwfl.h>
#include <inttypes.h>
#include <errno.h>
#include "debug.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,
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) {
Dwarf_Addr s;
dwfl_module_info(mod, NULL, &s, NULL, NULL, NULL, NULL, NULL);
if (s != al->map->start)
mod = 0;
}
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, 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 thread *thread,
struct perf_sample *data,
int max_stack)
{
struct unwind_info ui = {
.sample = data,
.thread = thread,
.machine = thread->mg->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;
}
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