Add x86 stack unwinding support to libcorkscrew.
Change-Id: I1d4f4b11b4c8bf517b1dd07afccbedc41a84fd1b
diff --git a/libcorkscrew/Android.mk b/libcorkscrew/Android.mk
index 08432ef..df019c35 100644
--- a/libcorkscrew/Android.mk
+++ b/libcorkscrew/Android.mk
@@ -31,6 +31,12 @@
LOCAL_CFLAGS += -DCORKSCREW_HAVE_ARCH -DCORKSCREW_HAVE_LIBIBERTY
LOCAL_LDFLAGS += -liberty
endif
+ifeq ($(TARGET_ARCH),x86)
+LOCAL_SRC_FILES += \
+ arch-x86/backtrace-x86.c \
+ arch-x86/ptrace-x86.c
+LOCAL_CFLAGS += -DCORKSCREW_HAVE_ARCH
+endif
LOCAL_SHARED_LIBRARIES += libdl libcutils
diff --git a/libcorkscrew/arch-x86/backtrace-x86.c b/libcorkscrew/arch-x86/backtrace-x86.c
new file mode 100644
index 0000000..1324899
--- /dev/null
+++ b/libcorkscrew/arch-x86/backtrace-x86.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Backtracing functions for x86.
+ */
+
+#define LOG_TAG "Corkscrew"
+//#define LOG_NDEBUG 0
+
+#include "../backtrace-arch.h"
+#include "../backtrace-helper.h"
+#include <corkscrew/ptrace.h>
+
+#include <stdlib.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <limits.h>
+#include <errno.h>
+#include <sys/ptrace.h>
+#include <sys/exec_elf.h>
+#include <cutils/log.h>
+
+/* 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 {
+ uint32_t gs;
+ uint32_t fs;
+ uint32_t es;
+ uint32_t ds;
+ uint32_t edi;
+ uint32_t esi;
+ uint32_t ebp;
+ uint32_t esp;
+ uint32_t ebx;
+ uint32_t edx;
+ uint32_t ecx;
+ uint32_t eax;
+ uint32_t trapno;
+ uint32_t err;
+ uint32_t eip;
+ uint32_t cs;
+ uint32_t efl;
+ uint32_t uesp;
+ uint32_t ss;
+ void* fpregs;
+ uint32_t oldmask;
+ uint32_t cr2;
+ } uc_mcontext;
+ uint32_t uc_sigmask;
+} ucontext_t;
+
+/* Unwind state. */
+typedef struct {
+ uint32_t ebp;
+ uint32_t eip;
+ uint32_t esp;
+} unwind_state_t;
+
+static ssize_t unwind_backtrace_common(pid_t tid, const ptrace_context_t* context,
+ unwind_state_t* state, backtrace_frame_t* backtrace,
+ size_t ignore_depth, size_t max_depth) {
+ size_t ignored_frames = 0;
+ size_t returned_frames = 0;
+
+ while (state->ebp && returned_frames < max_depth) {
+ backtrace_frame_t* frame = add_backtrace_entry(state->eip,
+ backtrace, ignore_depth, max_depth,
+ &ignored_frames, &returned_frames);
+ uint32_t next_esp = state->ebp + 8;
+ if (frame) {
+ frame->stack_top = state->esp;
+ if (state->esp < next_esp) {
+ frame->stack_size = next_esp - state->esp;
+ }
+ }
+ state->esp = next_esp;
+ if (!try_get_word(tid, state->ebp + 4, &state->eip)
+ || !try_get_word(tid, state->ebp, &state->ebp)
+ || !state->eip) {
+ break;
+ }
+ }
+
+ return returned_frames;
+}
+
+ssize_t unwind_backtrace_signal_arch(siginfo_t* siginfo, void* sigcontext,
+ backtrace_frame_t* backtrace, size_t ignore_depth, size_t max_depth) {
+ const ucontext_t* uc = (const ucontext_t*)sigcontext;
+
+ unwind_state_t state;
+ state.ebp = uc->uc_mcontext.ebp;
+ state.eip = uc->uc_mcontext.eip;
+ state.esp = uc->uc_mcontext.esp;
+
+ return unwind_backtrace_common(-1, NULL, &state, backtrace, ignore_depth, max_depth);
+}
+
+ssize_t unwind_backtrace_ptrace_arch(pid_t tid, const ptrace_context_t* context,
+ backtrace_frame_t* backtrace, size_t ignore_depth, size_t max_depth) {
+ pt_regs_x86_t regs;
+ if (ptrace(PTRACE_GETREGS, tid, 0, ®s)) {
+ return -1;
+ }
+
+ unwind_state_t state;
+ state.ebp = regs.ebp;
+ state.eip = regs.eip;
+ state.esp = regs.esp;
+
+ return unwind_backtrace_common(tid, context, &state, backtrace, ignore_depth, max_depth);
+}
diff --git a/libcorkscrew/arch-x86/ptrace-x86.c b/libcorkscrew/arch-x86/ptrace-x86.c
new file mode 100644
index 0000000..f0ea110
--- /dev/null
+++ b/libcorkscrew/arch-x86/ptrace-x86.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "Corkscrew"
+//#define LOG_NDEBUG 0
+
+#include "../ptrace-arch.h"
+
+#include <cutils/log.h>
+
+void load_ptrace_map_info_data_arch(pid_t pid, map_info_t* mi, map_info_data_t* data) {
+}
+
+void free_ptrace_map_info_data_arch(map_info_t* mi, map_info_data_t* data) {
+}