accel/tcg/debuginfo.c

   1 /*
   2  * Debug information support.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-or-later
   5  */
   6
   7 #include "qemu/osdep.h"
   8 #include "qemu/lockable.h"
   9
  10 #include <elfutils/libdwfl.h>
  11
  12 #include "debuginfo.h"
  13
  14 static QemuMutex lock;
  15 static Dwfl *dwfl;
  16 static const Dwfl_Callbacks dwfl_callbacks = {
  17     .find_elf = NULL,
  18     .find_debuginfo = dwfl_standard_find_debuginfo,
  19     .section_address = NULL,
  20     .debuginfo_path = NULL,
  21 };
  22
  23 __attribute__((constructor))
  24 static void debuginfo_init(void)
  25 {
  26     qemu_mutex_init(&lock);
  27 }
  28
  29 void debuginfo_report_elf(const char *name, int fd, uint64_t bias)
  30 {
  31     QEMU_LOCK_GUARD(&lock);
  32
  33     if (dwfl) {
  34         dwfl_report_begin_add(dwfl);
  35     } else {
  36         dwfl = dwfl_begin(&dwfl_callbacks);
  37     }
  38
  39     if (dwfl) {
  40         dwfl_report_elf(dwfl, name, name, fd, bias, true);
  41         dwfl_report_end(dwfl, NULL, NULL);
  42     }
  43 }
  44
  45 void debuginfo_lock(void)
  46 {
  47     qemu_mutex_lock(&lock);
  48 }
  49
  50 void debuginfo_query(struct debuginfo_query *q, size_t n)
  51 {
  52     const char *symbol, *file;
  53     Dwfl_Module *dwfl_module;
  54     Dwfl_Line *dwfl_line;
  55     GElf_Off dwfl_offset;
  56     GElf_Sym dwfl_sym;
  57     size_t i;
  58     int line;
  59
  60     if (!dwfl) {
  61         return;
  62     }
  63
  64     for (i = 0; i < n; i++) {
  65         dwfl_module = dwfl_addrmodule(dwfl, q[i].address);
  66         if (!dwfl_module) {
  67             continue;
  68         }
  69
  70         if (q[i].flags & DEBUGINFO_SYMBOL) {
  71             symbol = dwfl_module_addrinfo(dwfl_module, q[i].address,
  72                                           &dwfl_offset, &dwfl_sym,
  73                                           NULL, NULL, NULL);
  74             if (symbol) {
  75                 q[i].symbol = symbol;
  76                 q[i].offset = dwfl_offset;
  77             }
  78         }
  79
  80         if (q[i].flags & DEBUGINFO_LINE) {
  81             dwfl_line = dwfl_module_getsrc(dwfl_module, q[i].address);
  82             if (dwfl_line) {
  83                 file = dwfl_lineinfo(dwfl_line, NULL, &line, 0, NULL, NULL);
  84                 if (file) {
  85                     q[i].file = file;
  86                     q[i].line = line;
  87                 }
  88             }
  89         }
  90     }
  91 }
  92
  93 void debuginfo_unlock(void)
  94 {
  95     qemu_mutex_unlock(&lock);
  96 }