| 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 | } |