#include "defs.h"
#include "mmap_cache.h"
-#include <libunwind-ptrace.h>
+#include "unwind.h"
#ifdef USE_DEMANGLE
# if defined HAVE_DEMANGLE_H
# endif
#endif
-/*
- * Type used in stacktrace walker
- */
-typedef void (*call_action_fn)(void *data,
- const char *binary_filename,
- const char *symbol_name,
- unw_word_t function_offset,
- unsigned long true_offset);
-typedef void (*error_action_fn)(void *data,
- const char *error,
- unsigned long true_offset);
-
/*
* Type used in stacktrace capturing
*/
char *output_line;
};
-struct queue_t {
+struct unwind_queue_t {
struct call_t *tail;
struct call_t *head;
};
-static void queue_print(struct queue_t *queue);
-
-static unw_addr_space_t libunwind_as;
+static void queue_print(struct unwind_queue_t *queue);
static const char asprintf_error_str[] = "???";
void
unwind_init(void)
{
- libunwind_as = unw_create_addr_space(&_UPT_accessors, 0);
- if (!libunwind_as)
- error_msg_and_die("failed to create address space for stack tracing");
- unw_set_caching_policy(libunwind_as, UNW_CACHE_GLOBAL);
+ if (unwinder.init)
+ unwinder.init();
mmap_cache_enable();
}
void
unwind_tcb_init(struct tcb *tcp)
{
- if (tcp->libunwind_ui)
+ if (tcp->unwind_queue)
return;
- tcp->libunwind_ui = _UPT_create(tcp->pid);
- if (!tcp->libunwind_ui)
- perror_msg_and_die("_UPT_create");
+ tcp->unwind_queue = xmalloc(sizeof(*tcp->unwind_queue));
+ tcp->unwind_queue->head = NULL;
+ tcp->unwind_queue->tail = NULL;
- tcp->queue = xmalloc(sizeof(*tcp->queue));
- tcp->queue->head = NULL;
- tcp->queue->tail = NULL;
+ tcp->unwind_ctx = unwinder.tcb_init(tcp);
}
void
unwind_tcb_fin(struct tcb *tcp)
{
- queue_print(tcp->queue);
- free(tcp->queue);
- tcp->queue = NULL;
-
- _UPT_destroy(tcp->libunwind_ui);
- tcp->libunwind_ui = NULL;
-}
-
-static void
-get_symbol_name(unw_cursor_t *cursor, char **name,
- size_t *size, unw_word_t *offset)
-{
- for (;;) {
- int rc = unw_get_proc_name(cursor, *name, *size, offset);
- if (rc == 0)
- break;
- if (rc != -UNW_ENOMEM) {
- **name = '\0';
- *offset = 0;
- break;
- }
- *name = xgrowarray(*name, size, 1);
- }
-}
-
-static int
-print_stack_frame(struct tcb *tcp,
- call_action_fn call_action,
- error_action_fn error_action,
- void *data,
- unw_cursor_t *cursor,
- char **symbol_name,
- size_t *symbol_name_size)
-{
- unw_word_t ip;
- struct mmap_cache_t *cur_mmap_cache;
-
- if (unw_get_reg(cursor, UNW_REG_IP, &ip) < 0) {
- perror_msg("Can't walk the stack of process %d", tcp->pid);
- return -1;
- }
-
- cur_mmap_cache = mmap_cache_search(tcp, ip);
- if (cur_mmap_cache
- /* ignore mappings that have no PROT_EXEC bit set */
- && (cur_mmap_cache->protections & MMAP_CACHE_PROT_EXECUTABLE)) {
- unsigned long true_offset;
- unw_word_t function_offset;
-
- get_symbol_name(cursor, symbol_name, symbol_name_size,
- &function_offset);
- true_offset = ip - cur_mmap_cache->start_addr +
- cur_mmap_cache->mmap_offset;
-#ifdef USE_DEMANGLE
- char *demangled_name =
- cplus_demangle(*symbol_name,
- DMGL_AUTO | DMGL_PARAMS);
-#endif
- call_action(data,
- cur_mmap_cache->binary_filename,
-#ifdef USE_DEMANGLE
- demangled_name ? demangled_name :
-#endif
- *symbol_name,
- function_offset,
- true_offset);
-#ifdef USE_DEMANGLE
- free(demangled_name);
-#endif
-
- return 0;
- }
-
- /*
- * there is a bug in libunwind >= 1.0
- * after a set_tid_address syscall
- * unw_get_reg returns IP == 0
- */
- if (ip)
- error_action(data, "unexpected_backtracing_error", ip);
- return -1;
-}
-
-/*
- * walking the stack
- */
-static void
-stacktrace_walk(struct tcb *tcp,
- call_action_fn call_action,
- error_action_fn error_action,
- void *data)
-{
- char *symbol_name;
- size_t symbol_name_size = 40;
- unw_cursor_t cursor;
- int stack_depth;
-
- if (!tcp->mmap_cache)
- error_msg_and_die("bug: mmap_cache is NULL");
- if (tcp->mmap_cache_size == 0)
- error_msg_and_die("bug: mmap_cache is empty");
-
- symbol_name = xmalloc(symbol_name_size);
-
- if (unw_init_remote(&cursor, libunwind_as, tcp->libunwind_ui) < 0)
- perror_msg_and_die("Can't initiate libunwind");
+ if (!tcp->unwind_queue)
+ return;
- for (stack_depth = 0; stack_depth < 256; ++stack_depth) {
- if (print_stack_frame(tcp, call_action, error_action, data,
- &cursor, &symbol_name, &symbol_name_size) < 0)
- break;
- if (unw_step(&cursor) <= 0)
- break;
- }
- if (stack_depth >= 256)
- error_action(data, "too many stack frames", 0);
+ queue_print(tcp->unwind_queue);
+ free(tcp->unwind_queue);
+ tcp->unwind_queue = NULL;
- free(symbol_name);
+ unwinder.tcb_fin(tcp);
+ tcp->unwind_ctx = NULL;
}
/*
* /lib64/libc.so.6(__libc_start_main+0xed) [0x7fa2f8a5976d]
* ./a.out() [0x400569]
*/
-#define STACK_ENTRY_SYMBOL_FMT \
+#define STACK_ENTRY_SYMBOL_FMT(SYM) \
" > %s(%s+0x%lx) [0x%lx]\n", \
binary_filename, \
- symbol_name, \
+ (SYM), \
(unsigned long) function_offset, \
true_offset
#define STACK_ENTRY_NOSYMBOL_FMT \
print_call_cb(void *dummy,
const char *binary_filename,
const char *symbol_name,
- unw_word_t function_offset,
+ unwind_function_offset_t function_offset,
unsigned long true_offset)
{
- if (symbol_name && (symbol_name[0] != '\0'))
- tprintf(STACK_ENTRY_SYMBOL_FMT);
+ if (symbol_name && (symbol_name[0] != '\0')) {
+#ifdef USE_DEMANGLE
+ char *demangled_name =
+ cplus_demangle(symbol_name,
+ DMGL_AUTO | DMGL_PARAMS);
+#endif
+ tprintf(STACK_ENTRY_SYMBOL_FMT(
+#ifdef USE_DEMANGLE
+ demangled_name ? demangled_name :
+#endif
+ symbol_name));
+#ifdef USE_DEMANGLE
+ free(demangled_name);
+#endif
+ }
else if (binary_filename)
tprintf(STACK_ENTRY_NOSYMBOL_FMT);
else
static char *
sprint_call_or_error(const char *binary_filename,
const char *symbol_name,
- unw_word_t function_offset,
+ unwind_function_offset_t function_offset,
unsigned long true_offset,
const char *error)
{
char *output_line = NULL;
int n;
- if (symbol_name)
- n = asprintf(&output_line, STACK_ENTRY_SYMBOL_FMT);
+ if (symbol_name) {
+#ifdef USE_DEMANGLE
+ char *demangled_name =
+ cplus_demangle(symbol_name,
+ DMGL_AUTO | DMGL_PARAMS);
+#endif
+ n = asprintf(&output_line,
+ STACK_ENTRY_SYMBOL_FMT(
+#ifdef USE_DEMANGLE
+ demangled_name ? demangled_name :
+#endif
+ symbol_name));
+#ifdef USE_DEMANGLE
+ free(demangled_name);
+#endif
+ }
else if (binary_filename)
n = asprintf(&output_line, STACK_ENTRY_NOSYMBOL_FMT);
else if (error)
* queue manipulators
*/
static void
-queue_put(struct queue_t *queue,
+queue_put(struct unwind_queue_t *queue,
const char *binary_filename,
const char *symbol_name,
- unw_word_t function_offset,
+ unwind_function_offset_t function_offset,
unsigned long true_offset,
const char *error)
{
queue_put_call(void *queue,
const char *binary_filename,
const char *symbol_name,
- unw_word_t function_offset,
+ unwind_function_offset_t function_offset,
unsigned long true_offset)
{
queue_put(queue,
}
static void
-queue_print(struct queue_t *queue)
+queue_print(struct unwind_queue_t *queue)
{
struct call_t *call, *tmp;
* printing stack
*/
void
-unwind_print_stacktrace(struct tcb *tcp)
+unwind_tcb_print(struct tcb *tcp)
{
#if SUPPORTED_PERSONALITIES > 1
if (tcp->currpers != DEFAULT_PERSONALITY) {
return;
}
#endif
- if (tcp->queue->head) {
- debug_func_msg("head: tcp=%p, queue=%p", tcp, tcp->queue->head);
- queue_print(tcp->queue);
+ if (tcp->unwind_queue->head) {
+ debug_func_msg("head: tcp=%p, queue=%p",
+ tcp, tcp->unwind_queue->head);
+ queue_print(tcp->unwind_queue);
} else switch (mmap_cache_rebuild_if_invalid(tcp, __func__)) {
case MMAP_CACHE_REBUILD_RENEWED:
- unw_flush_cache(libunwind_as, 0, 0);
- /* Fall through */
+ unwinder.tcb_flush_cache(tcp);
+ ATTRIBUTE_FALLTHROUGH;
case MMAP_CACHE_REBUILD_READY:
- debug_func_msg("walk: tcp=%p, queue=%p", tcp, tcp->queue->head);
- stacktrace_walk(tcp, print_call_cb, print_error_cb, NULL);
+ debug_func_msg("walk: tcp=%p, queue=%p",
+ tcp, tcp->unwind_queue->head);
+ unwinder.tcb_walk(tcp, print_call_cb, print_error_cb, NULL);
break;
default:
/* Do nothing */
* capturing stack
*/
void
-unwind_capture_stacktrace(struct tcb *tcp)
+unwind_tcb_capture(struct tcb *tcp)
{
#if SUPPORTED_PERSONALITIES > 1
if (tcp->currpers != DEFAULT_PERSONALITY) {
return;
}
#endif
- if (tcp->queue->head)
+ if (tcp->unwind_queue->head)
error_msg_and_die("bug: unprinted entries in queue");
switch (mmap_cache_rebuild_if_invalid(tcp, __func__)) {
case MMAP_CACHE_REBUILD_RENEWED:
- unw_flush_cache(libunwind_as, 0, 0);
- /* Fall through */
+ unwinder.tcb_flush_cache(tcp);
+ ATTRIBUTE_FALLTHROUGH;
case MMAP_CACHE_REBUILD_READY:
- stacktrace_walk(tcp, queue_put_call, queue_put_error,
- tcp->queue);
- debug_func_msg("tcp=%p, queue=%p", tcp, tcp->queue->head);
+ unwinder.tcb_walk(tcp, queue_put_call, queue_put_error,
+ tcp->unwind_queue);
+ debug_func_msg("tcp=%p, queue=%p",
+ tcp, tcp->unwind_queue->head);
break;
default:
/* Do nothing */
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