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-rwxr-xr-x[-rw-r--r--]libbacktrace/UnwindCurrent.cpp128
1 files changed, 51 insertions, 77 deletions
diff --git a/libbacktrace/UnwindCurrent.cpp b/libbacktrace/UnwindCurrent.cpp
index 17b71b9..b176aaf 100644..100755
--- a/libbacktrace/UnwindCurrent.cpp
+++ b/libbacktrace/UnwindCurrent.cpp
@@ -14,9 +14,8 @@
* limitations under the License.
*/
-#define LOG_TAG "libbacktrace"
-
#include <sys/types.h>
+#include <ucontext.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
@@ -24,30 +23,11 @@
#define UNW_LOCAL_ONLY
#include <libunwind.h>
+#include "BacktraceLog.h"
+#include "BacktraceThread.h"
#include "UnwindCurrent.h"
#include "UnwindMap.h"
-// Define the ucontext_t structures needed for each supported arch.
-#if defined(__arm__)
- // The current version of the <signal.h> doesn't define ucontext_t.
- #include <asm/sigcontext.h> // Ensure 'struct sigcontext' is defined.
-
- // Machine context at the time a signal was raised.
- typedef struct ucontext {
- uint32_t uc_flags;
- struct ucontext* uc_link;
- stack_t uc_stack;
- struct sigcontext uc_mcontext;
- uint32_t uc_sigmask;
- } ucontext_t;
-#elif defined(__i386__)
- #include <asm/sigcontext.h>
- #include <asm/ucontext.h>
- typedef struct ucontext ucontext_t;
-#elif !defined(__mips__) && !defined(__aarch64__)
- #error Unsupported architecture.
-#endif
-
//-------------------------------------------------------------------------
// UnwindCurrent functions.
//-------------------------------------------------------------------------
@@ -57,13 +37,43 @@ UnwindCurrent::UnwindCurrent() {
UnwindCurrent::~UnwindCurrent() {
}
-bool UnwindCurrent::Unwind(size_t num_ignore_frames) {
- int ret = unw_getcontext(&context_);
- if (ret < 0) {
- BACK_LOGW("unw_getcontext failed %d", ret);
- return false;
+bool UnwindCurrent::Unwind(size_t num_ignore_frames, ucontext_t* ucontext) {
+ if (!ucontext) {
+ int ret = unw_getcontext(&context_);
+ if (ret < 0) {
+ BACK_LOGW("unw_getcontext failed %d", ret);
+ return false;
+ }
}
- return UnwindFromContext(num_ignore_frames, true);
+ else {
+ GetUnwContextFromUcontext(ucontext);
+ }
+ return UnwindFromContext(num_ignore_frames, false);
+}
+
+void UnwindCurrent::GetUnwContextFromUcontext(const ucontext_t* ucontext) {
+ unw_tdep_context_t* unw_context = reinterpret_cast<unw_tdep_context_t*>(&context_);
+
+#if defined(__arm__)
+ unw_context->regs[0] = ucontext->uc_mcontext.arm_r0;
+ unw_context->regs[1] = ucontext->uc_mcontext.arm_r1;
+ unw_context->regs[2] = ucontext->uc_mcontext.arm_r2;
+ unw_context->regs[3] = ucontext->uc_mcontext.arm_r3;
+ unw_context->regs[4] = ucontext->uc_mcontext.arm_r4;
+ unw_context->regs[5] = ucontext->uc_mcontext.arm_r5;
+ unw_context->regs[6] = ucontext->uc_mcontext.arm_r6;
+ unw_context->regs[7] = ucontext->uc_mcontext.arm_r7;
+ unw_context->regs[8] = ucontext->uc_mcontext.arm_r8;
+ unw_context->regs[9] = ucontext->uc_mcontext.arm_r9;
+ unw_context->regs[10] = ucontext->uc_mcontext.arm_r10;
+ unw_context->regs[11] = ucontext->uc_mcontext.arm_fp;
+ unw_context->regs[12] = ucontext->uc_mcontext.arm_ip;
+ unw_context->regs[13] = ucontext->uc_mcontext.arm_sp;
+ unw_context->regs[14] = ucontext->uc_mcontext.arm_lr;
+ unw_context->regs[15] = ucontext->uc_mcontext.arm_pc;
+#else
+ unw_context->uc_mcontext = ucontext->uc_mcontext;
+#endif
}
std::string UnwindCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
@@ -78,12 +88,14 @@ std::string UnwindCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
return "";
}
-bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
+bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool within_handler) {
// The cursor structure is pretty large, do not put it on the stack.
unw_cursor_t* cursor = new unw_cursor_t;
int ret = unw_init_local(cursor, &context_);
if (ret < 0) {
- BACK_LOGW("unw_init_local failed %d", ret);
+ if (!within_handler) {
+ BACK_LOGW("unw_init_local failed %d", ret);
+ }
delete cursor;
return false;
}
@@ -95,13 +107,17 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
unw_word_t pc;
ret = unw_get_reg(cursor, UNW_REG_IP, &pc);
if (ret < 0) {
- BACK_LOGW("Failed to read IP %d", ret);
+ if (!within_handler) {
+ BACK_LOGW("Failed to read IP %d", ret);
+ }
break;
}
unw_word_t sp;
ret = unw_get_reg(cursor, UNW_REG_SP, &sp);
if (ret < 0) {
- BACK_LOGW("Failed to read SP %d", ret);
+ if (!within_handler) {
+ BACK_LOGW("Failed to read SP %d", ret);
+ }
break;
}
@@ -119,7 +135,7 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
prev->stack_size = frame->sp - prev->sp;
}
- if (resolve) {
+ if (!within_handler) {
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
frame->map = FindMap(frame->pc);
} else {
@@ -137,47 +153,6 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
return true;
}
-void UnwindCurrent::ExtractContext(void* sigcontext) {
- unw_tdep_context_t* context = reinterpret_cast<unw_tdep_context_t*>(&context_);
- const ucontext_t* uc = reinterpret_cast<const ucontext_t*>(sigcontext);
-
-#if defined(__arm__)
- context->regs[0] = uc->uc_mcontext.arm_r0;
- context->regs[1] = uc->uc_mcontext.arm_r1;
- context->regs[2] = uc->uc_mcontext.arm_r2;
- context->regs[3] = uc->uc_mcontext.arm_r3;
- context->regs[4] = uc->uc_mcontext.arm_r4;
- context->regs[5] = uc->uc_mcontext.arm_r5;
- context->regs[6] = uc->uc_mcontext.arm_r6;
- context->regs[7] = uc->uc_mcontext.arm_r7;
- context->regs[8] = uc->uc_mcontext.arm_r8;
- context->regs[9] = uc->uc_mcontext.arm_r9;
- context->regs[10] = uc->uc_mcontext.arm_r10;
- context->regs[11] = uc->uc_mcontext.arm_fp;
- context->regs[12] = uc->uc_mcontext.arm_ip;
- context->regs[13] = uc->uc_mcontext.arm_sp;
- context->regs[14] = uc->uc_mcontext.arm_lr;
- context->regs[15] = uc->uc_mcontext.arm_pc;
-#elif defined(__mips__) || defined(__i386__)
- context->uc_mcontext = uc->uc_mcontext;
-#endif
-}
-
-//-------------------------------------------------------------------------
-// UnwindThread functions.
-//-------------------------------------------------------------------------
-UnwindThread::UnwindThread() {
-}
-
-UnwindThread::~UnwindThread() {
-}
-
-void UnwindThread::ThreadUnwind(
- siginfo_t* /*siginfo*/, void* sigcontext, size_t num_ignore_frames) {
- ExtractContext(sigcontext);
- UnwindFromContext(num_ignore_frames, false);
-}
-
//-------------------------------------------------------------------------
// C++ object creation function.
//-------------------------------------------------------------------------
@@ -186,6 +161,5 @@ Backtrace* CreateCurrentObj(BacktraceMap* map) {
}
Backtrace* CreateThreadObj(pid_t tid, BacktraceMap* map) {
- UnwindThread* thread_obj = new UnwindThread();
- return new BacktraceThread(thread_obj, thread_obj, tid, map);
+ return new BacktraceThread(new UnwindCurrent(), tid, map);
}
generated by cgit v1.1 at 2025-08-15 15:42:10 +0000