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#include <libunwind.h>
#include "config.h"
#include "backtrace.h"
#define LT_MAXMSG 300
int bt_dump(struct lt_config_shared *cfg, unsigned long flags)
{
unw_cursor_t cursor;
unw_context_t uc;
int ret = 0;
unw_getcontext(&uc);
if (unw_init_local(&cursor, &uc) < 0) {
bt_display(cfg, "unw_init_local failed");
return -1;
}
bt_display(cfg, "backtrace:");
do {
char text[LT_MAXMSG];
struct bt_map *map;
bt_word_t rel_ip = 0, ip = 0, sp;
bt_word_t sym_offset = 0;
bt_word_t sym_size= 0;
char *map_name = NULL;
char *sym_name = NULL;
struct bt_symbol *symbol = NULL;
int size = sizeof(bt_word_t) * 2;
int symbol_found = 0;
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (bt_find_map(cfg, &map, ip)) {
rel_ip = ip - map->base;
map_name = map->name;
if (bt_find_symbol(cfg, &symbol, map, rel_ip)) {
sym_name = symbol->name;
sym_offset = rel_ip - symbol->start;
sym_size = symbol->end - symbol->start;
symbol_found = 1;
}
}
if (symbol_found)
snprintf(text, LT_MAXMSG,
"\t<0x%0*zx> %s+0x%zx/0x%zx [%s]",
size, rel_ip,
sym_name,
sym_offset,
sym_size,
map_name);
else
snprintf(text, LT_MAXMSG,
"\t<0x%0*zx> [%s]",
size, rel_ip,
map_name);
bt_display(cfg, text);
ret = unw_step(&cursor);
if (ret < 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
snprintf(text, LT_MAXMSG,
"unw_step failed for ip=%zx\n",
ip);
bt_display(cfg, text);
}
} while (ret > 0);
return ret;
}
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