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