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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:25:50 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:25:50 +0000
commit19f4f86bfed21c5326ed2acebe1163f3a83e832b (patch)
treed59b9989ce55ed23693e80974d94c856f1c2c8b1 /src/coredump/stacktrace.c
parentInitial commit. (diff)
downloadsystemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.tar.xz
systemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.zip
Adding upstream version 241.upstream/241upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/coredump/stacktrace.c')
-rw-r--r--src/coredump/stacktrace.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/src/coredump/stacktrace.c b/src/coredump/stacktrace.c
new file mode 100644
index 0000000..dab4c1a
--- /dev/null
+++ b/src/coredump/stacktrace.c
@@ -0,0 +1,185 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <dwarf.h>
+#include <elfutils/libdwfl.h>
+#include <stdio_ext.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "macro.h"
+#include "stacktrace.h"
+#include "string-util.h"
+#include "util.h"
+
+#define FRAMES_MAX 64
+#define THREADS_MAX 64
+
+struct stack_context {
+ FILE *f;
+ Dwfl *dwfl;
+ Elf *elf;
+ unsigned n_thread;
+ unsigned n_frame;
+};
+
+static int frame_callback(Dwfl_Frame *frame, void *userdata) {
+ struct stack_context *c = userdata;
+ Dwarf_Addr pc, pc_adjusted, bias = 0;
+ _cleanup_free_ Dwarf_Die *scopes = NULL;
+ const char *fname = NULL, *symbol = NULL;
+ Dwfl_Module *module;
+ bool is_activation;
+
+ assert(frame);
+ assert(c);
+
+ if (c->n_frame >= FRAMES_MAX)
+ return DWARF_CB_ABORT;
+
+ if (!dwfl_frame_pc(frame, &pc, &is_activation))
+ return DWARF_CB_ABORT;
+
+ pc_adjusted = pc - (is_activation ? 0 : 1);
+
+ module = dwfl_addrmodule(c->dwfl, pc_adjusted);
+ if (module) {
+ Dwarf_Die *s, *cudie;
+ int n;
+
+ cudie = dwfl_module_addrdie(module, pc_adjusted, &bias);
+ if (cudie) {
+ n = dwarf_getscopes(cudie, pc_adjusted - bias, &scopes);
+ for (s = scopes; s < scopes + n; s++) {
+ if (IN_SET(dwarf_tag(s), DW_TAG_subprogram, DW_TAG_inlined_subroutine, DW_TAG_entry_point)) {
+ Dwarf_Attribute *a, space;
+
+ a = dwarf_attr_integrate(s, DW_AT_MIPS_linkage_name, &space);
+ if (!a)
+ a = dwarf_attr_integrate(s, DW_AT_linkage_name, &space);
+ if (a)
+ symbol = dwarf_formstring(a);
+ if (!symbol)
+ symbol = dwarf_diename(s);
+
+ if (symbol)
+ break;
+ }
+ }
+ }
+
+ if (!symbol)
+ symbol = dwfl_module_addrname(module, pc_adjusted);
+
+ fname = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+ }
+
+ fprintf(c->f, "#%-2u 0x%016" PRIx64 " %s (%s)\n", c->n_frame, (uint64_t) pc, strna(symbol), strna(fname));
+ c->n_frame++;
+
+ return DWARF_CB_OK;
+}
+
+static int thread_callback(Dwfl_Thread *thread, void *userdata) {
+ struct stack_context *c = userdata;
+ pid_t tid;
+
+ assert(thread);
+ assert(c);
+
+ if (c->n_thread >= THREADS_MAX)
+ return DWARF_CB_ABORT;
+
+ if (c->n_thread != 0)
+ fputc('\n', c->f);
+
+ c->n_frame = 0;
+
+ tid = dwfl_thread_tid(thread);
+ fprintf(c->f, "Stack trace of thread " PID_FMT ":\n", tid);
+
+ if (dwfl_thread_getframes(thread, frame_callback, c) < 0)
+ return DWARF_CB_ABORT;
+
+ c->n_thread++;
+
+ return DWARF_CB_OK;
+}
+
+int coredump_make_stack_trace(int fd, const char *executable, char **ret) {
+
+ static const Dwfl_Callbacks callbacks = {
+ .find_elf = dwfl_build_id_find_elf,
+ .find_debuginfo = dwfl_standard_find_debuginfo,
+ };
+
+ struct stack_context c = {};
+ char *buf = NULL;
+ size_t sz = 0;
+ int r;
+
+ assert(fd >= 0);
+ assert(ret);
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
+ return -errno;
+
+ c.f = open_memstream(&buf, &sz);
+ if (!c.f)
+ return -ENOMEM;
+
+ (void) __fsetlocking(c.f, FSETLOCKING_BYCALLER);
+
+ elf_version(EV_CURRENT);
+
+ c.elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
+ if (!c.elf) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ c.dwfl = dwfl_begin(&callbacks);
+ if (!c.dwfl) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_core_file_report(c.dwfl, c.elf, executable) < 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_report_end(c.dwfl, NULL, NULL) != 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_core_file_attach(c.dwfl, c.elf) < 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_getthreads(c.dwfl, thread_callback, &c) < 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ c.f = safe_fclose(c.f);
+
+ *ret = TAKE_PTR(buf);
+
+ r = 0;
+
+finish:
+ if (c.dwfl)
+ dwfl_end(c.dwfl);
+
+ if (c.elf)
+ elf_end(c.elf);
+
+ safe_fclose(c.f);
+
+ free(buf);
+
+ return r;
+}