auto import from //depot/cupcake/@135843
diff --git a/debuggerd/Android.mk b/debuggerd/Android.mk
new file mode 100644
index 0000000..b22e1a8
--- /dev/null
+++ b/debuggerd/Android.mk
@@ -0,0 +1,26 @@
+# Copyright 2005 The Android Open Source Project
+
+ifeq ($(TARGET_ARCH),arm)
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= debuggerd.c getevent.c unwind-arm.c pr-support.c utility.c
+LOCAL_CFLAGS := -Wall
+LOCAL_MODULE := debuggerd
+
+LOCAL_STATIC_LIBRARIES := libcutils libc
+
+include $(BUILD_EXECUTABLE)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := crasher.c
+LOCAL_SRC_FILES += crashglue.S
+LOCAL_MODULE := crasher
+LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
+LOCAL_MODULE_TAGS := eng
+#LOCAL_FORCE_STATIC_EXECUTABLE := true
+LOCAL_SHARED_LIBRARIES := libcutils libc
+include $(BUILD_EXECUTABLE)
+
+endif # TARGET_ARCH == arm
diff --git a/debuggerd/MODULE_LICENSE_APACHE2 b/debuggerd/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/debuggerd/MODULE_LICENSE_APACHE2
diff --git a/debuggerd/NOTICE b/debuggerd/NOTICE
new file mode 100644
index 0000000..c5b1efa
--- /dev/null
+++ b/debuggerd/NOTICE
@@ -0,0 +1,190 @@
+
+ Copyright (c) 2005-2008, 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.
+
+ 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.
+
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+ 2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+ 3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+ 4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+ 9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+ END OF TERMS AND CONDITIONS
+
diff --git a/debuggerd/crasher.c b/debuggerd/crasher.c
new file mode 100644
index 0000000..f4a5a62
--- /dev/null
+++ b/debuggerd/crasher.c
@@ -0,0 +1,105 @@
+
+//#include <cutils/misc.h>
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sched.h>
+#include <errno.h>
+
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+
+#include <pthread.h>
+
+#include <cutils/sockets.h>
+
+void crash1(void);
+void crashnostack(void);
+
+static void debuggerd_connect()
+{
+ char tmp[1];
+ int s;
+ sprintf(tmp, "%d", gettid());
+ s = socket_local_client("android:debuggerd",
+ ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
+ if(s >= 0) {
+ read(s, tmp, 1);
+ close(s);
+ }
+}
+
+void test_call1()
+{
+ *((int*) 32) = 1;
+}
+
+void *test_thread(void *x)
+{
+ printf("crasher: thread pid=%d tid=%d\n", getpid(), gettid());
+
+ sleep(1);
+ test_call1();
+ printf("goodbye\n");
+
+ return 0;
+}
+
+void *noisy(void *x)
+{
+ char c = (unsigned) x;
+ for(;;) {
+ usleep(250*1000);
+ write(2, &c, 1);
+ if(c == 'C') *((unsigned*) 0) = 42;
+ }
+ return 0;
+}
+
+int ctest()
+{
+ pthread_t thr;
+ pthread_attr_t attr;
+ pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ pthread_create(&thr, &attr, noisy, (void*) 'A');
+ pthread_create(&thr, &attr, noisy, (void*) 'B');
+ pthread_create(&thr, &attr, noisy, (void*) 'C');
+ for(;;) ;
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ pthread_t thr;
+ pthread_attr_t attr;
+
+ fprintf(stderr,"crasher: " __TIME__ "!@\n");
+ fprintf(stderr,"crasher: init pid=%d tid=%d\n", getpid(), gettid());
+
+ if(argc > 1) {
+ if(!strcmp(argv[1],"nostack")) crashnostack();
+ if(!strcmp(argv[1],"ctest")) return ctest();
+ if(!strcmp(argv[1],"exit")) exit(1);
+ if(!strcmp(argv[1],"abort")) maybeabort();
+
+ pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ pthread_create(&thr, &attr, test_thread, 0);
+ while(1) sleep(1);
+ } else {
+ crash1();
+// *((int*) 0) = 42;
+ }
+
+ return 0;
+}
+
+void maybeabort()
+{
+ if(time(0) != 42) abort();
+}
diff --git a/debuggerd/crashglue.S b/debuggerd/crashglue.S
new file mode 100644
index 0000000..888951b
--- /dev/null
+++ b/debuggerd/crashglue.S
@@ -0,0 +1,28 @@
+.globl crash1
+.globl crashnostack
+
+crash1:
+ ldr r0, =0xa5a50000
+ ldr r1, =0xa5a50001
+ ldr r2, =0xa5a50002
+ ldr r3, =0xa5a50003
+ ldr r4, =0xa5a50004
+ ldr r5, =0xa5a50005
+ ldr r6, =0xa5a50006
+ ldr r7, =0xa5a50007
+ ldr r8, =0xa5a50008
+ ldr r9, =0xa5a50009
+ ldr r10, =0xa5a50010
+ ldr r11, =0xa5a50011
+ ldr r12, =0xa5a50012
+
+ mov lr, #0
+ ldr lr, [lr]
+ b .
+
+
+crashnostack:
+ mov sp, #0
+ mov r0, #0
+ ldr r0, [r0]
+ b .
\ No newline at end of file
diff --git a/debuggerd/debuggerd.c b/debuggerd/debuggerd.c
new file mode 100644
index 0000000..9394e1c
--- /dev/null
+++ b/debuggerd/debuggerd.c
@@ -0,0 +1,852 @@
+/* system/debuggerd/debuggerd.c
+**
+** Copyright 2006, 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.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <sys/exec_elf.h>
+#include <sys/stat.h>
+
+#include <cutils/sockets.h>
+#include <cutils/logd.h>
+#include <cutils/sockets.h>
+#include <cutils/properties.h>
+
+#include <linux/input.h>
+
+#include <private/android_filesystem_config.h>
+
+#include "utility.h"
+
+/* Main entry point to get the backtrace from the crashing process */
+extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
+ unsigned int sp_list[],
+ int *frame0_pc_sane,
+ bool at_fault);
+
+static char **process_name_ptr;
+
+static int logsocket = -1;
+
+#define ANDROID_LOG_INFO 4
+
+/* Log information onto the tombstone */
+void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...)
+{
+ char buf[128];
+
+ va_list ap;
+ va_start(ap, fmt);
+
+ if (tfd >= 0) {
+ int len;
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+ len = strlen(buf);
+ if(tfd >= 0) write(tfd, buf, len);
+ }
+
+ if (!in_tombstone_only)
+ __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
+}
+
+#define LOG(fmt...) _LOG(-1, 0, fmt)
+#if 0
+#define XLOG(fmt...) _LOG(-1, 0, fmt)
+#else
+#define XLOG(fmt...) do {} while(0)
+#endif
+
+// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
+// 012345678901234567890123456789012345678901234567890123456789
+// 0 1 2 3 4 5
+
+mapinfo *parse_maps_line(char *line)
+{
+ mapinfo *mi;
+ int len = strlen(line);
+
+ if(len < 1) return 0;
+ line[--len] = 0;
+
+ if(len < 50) return 0;
+ if(line[20] != 'x') return 0;
+
+ mi = malloc(sizeof(mapinfo) + (len - 47));
+ if(mi == 0) return 0;
+
+ mi->start = strtoul(line, 0, 16);
+ mi->end = strtoul(line + 9, 0, 16);
+ /* To be filled in parse_exidx_info if the mapped section starts with
+ * elf_header
+ */
+ mi->exidx_start = mi->exidx_end = 0;
+ mi->next = 0;
+ strcpy(mi->name, line + 49);
+
+ return mi;
+}
+
+void dump_build_info(int tfd)
+{
+ char fingerprint[PROPERTY_VALUE_MAX];
+
+ property_get("ro.build.fingerprint", fingerprint, "unknown");
+
+ _LOG(tfd, false, "Build fingerprint: '%s'\n", fingerprint);
+}
+
+
+void dump_stack_and_code(int tfd, int pid, mapinfo *map,
+ int unwind_depth, unsigned int sp_list[],
+ int frame0_pc_sane, bool at_fault)
+{
+ unsigned int sp, pc, p, end, data;
+ struct pt_regs r;
+ int sp_depth;
+ bool only_in_tombstone = !at_fault;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
+ sp = r.ARM_sp;
+ pc = r.ARM_pc;
+
+ /* Died because calling the weeds - dump
+ * the code around the PC in the next frame instead.
+ */
+ if (frame0_pc_sane == 0) {
+ pc = r.ARM_lr;
+ }
+
+ _LOG(tfd, true, "code%s:\n", frame0_pc_sane ? "" : " (around frame #01)");
+
+ end = p = pc & ~3;
+ p -= 16;
+
+ /* Dump the code as:
+ * PC contents
+ * 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
+ * 00008d44 f7ff18a0 490ced94 68035860 d0012b00
+ */
+ while (p <= end) {
+ int i;
+
+ _LOG(tfd, true, " %08x ", p);
+ for (i = 0; i < 4; i++) {
+ data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
+ _LOG(tfd, true, " %08x", data);
+ p += 4;
+ }
+ _LOG(tfd, true, "\n", p);
+ }
+
+ p = sp - 64;
+ p &= ~3;
+ if (unwind_depth != 0) {
+ if (unwind_depth < STACK_CONTENT_DEPTH) {
+ end = sp_list[unwind_depth-1];
+ }
+ else {
+ end = sp_list[STACK_CONTENT_DEPTH-1];
+ }
+ }
+ else {
+ end = sp | 0x000000ff;
+ end += 0xff;
+ }
+
+ _LOG(tfd, only_in_tombstone, "stack:\n");
+
+ /* If the crash is due to PC == 0, there will be two frames that
+ * have identical SP value.
+ */
+ if (sp_list[0] == sp_list[1]) {
+ sp_depth = 1;
+ }
+ else {
+ sp_depth = 0;
+ }
+
+ while (p <= end) {
+ char *prompt;
+ char level[16];
+ data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
+ if (p == sp_list[sp_depth]) {
+ sprintf(level, "#%02d", sp_depth++);
+ prompt = level;
+ }
+ else {
+ prompt = " ";
+ }
+
+ /* Print the stack content in the log for the first 3 frames. For the
+ * rest only print them in the tombstone file.
+ */
+ _LOG(tfd, (sp_depth > 2) || only_in_tombstone,
+ "%s %08x %08x %s\n", prompt, p, data,
+ map_to_name(map, data, ""));
+ p += 4;
+ }
+ /* print another 64-byte of stack data after the last frame */
+
+ end = p+64;
+ while (p <= end) {
+ data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
+ _LOG(tfd, (sp_depth > 2) || only_in_tombstone,
+ " %08x %08x %s\n", p, data,
+ map_to_name(map, data, ""));
+ p += 4;
+ }
+}
+
+void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level,
+ bool at_fault)
+{
+ struct pt_regs r;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
+ _LOG(tfd, !at_fault, "tid %d not responding!\n", pid);
+ return;
+ }
+
+ if (unwound_level == 0) {
+ _LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 0, r.ARM_pc,
+ map_to_name(map, r.ARM_pc, "<unknown>"));
+ }
+ _LOG(tfd, !at_fault, " #%02d lr %08x %s\n", 1, r.ARM_lr,
+ map_to_name(map, r.ARM_lr, "<unknown>"));
+}
+
+void dump_registers(int tfd, int pid, bool at_fault)
+{
+ struct pt_regs r;
+ bool only_in_tombstone = !at_fault;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
+ _LOG(tfd, only_in_tombstone,
+ "cannot get registers: %s\n", strerror(errno));
+ return;
+ }
+
+ _LOG(tfd, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
+ r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3);
+ _LOG(tfd, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
+ r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7);
+ _LOG(tfd, only_in_tombstone, " r8 %08x r9 %08x 10 %08x fp %08x\n",
+ r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp);
+ _LOG(tfd, only_in_tombstone,
+ " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
+ r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);
+}
+
+const char *get_signame(int sig)
+{
+ switch(sig) {
+ case SIGILL: return "SIGILL";
+ case SIGABRT: return "SIGABRT";
+ case SIGBUS: return "SIGBUS";
+ case SIGFPE: return "SIGFPE";
+ case SIGSEGV: return "SIGSEGV";
+ case SIGSTKFLT: return "SIGSTKFLT";
+ default: return "?";
+ }
+}
+
+void dump_fault_addr(int tfd, int pid, int sig)
+{
+ siginfo_t si;
+
+ memset(&si, 0, sizeof(si));
+ if(ptrace(PTRACE_GETSIGINFO, pid, 0, &si)){
+ _LOG(tfd, false, "cannot get siginfo: %s\n", strerror(errno));
+ } else {
+ _LOG(tfd, false, "signal %d (%s), fault addr %08x\n",
+ sig, get_signame(sig), si.si_addr);
+ }
+}
+
+void dump_crash_banner(int tfd, unsigned pid, unsigned tid, int sig)
+{
+ char data[1024];
+ char *x = 0;
+ FILE *fp;
+
+ sprintf(data, "/proc/%d/cmdline", pid);
+ fp = fopen(data, "r");
+ if(fp) {
+ x = fgets(data, 1024, fp);
+ fclose(fp);
+ }
+
+ _LOG(tfd, false,
+ "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
+ dump_build_info(tfd);
+ _LOG(tfd, false, "pid: %d, tid: %d >>> %s <<<\n",
+ pid, tid, x ? x : "UNKNOWN");
+
+ if(sig) dump_fault_addr(tfd, tid, sig);
+}
+
+static void parse_exidx_info(mapinfo *milist, pid_t pid)
+{
+ mapinfo *mi;
+ for (mi = milist; mi != NULL; mi = mi->next) {
+ Elf32_Ehdr ehdr;
+
+ memset(&ehdr, 0, sizeof(Elf32_Ehdr));
+ /* Read in sizeof(Elf32_Ehdr) worth of data from the beginning of
+ * mapped section.
+ */
+ get_remote_struct(pid, (void *) (mi->start), &ehdr,
+ sizeof(Elf32_Ehdr));
+ /* Check if it has the matching magic words */
+ if (IS_ELF(ehdr)) {
+ Elf32_Phdr phdr;
+ Elf32_Phdr *ptr;
+ int i;
+
+ ptr = (Elf32_Phdr *) (mi->start + ehdr.e_phoff);
+ for (i = 0; i < ehdr.e_phnum; i++) {
+ /* Parse the program header */
+ get_remote_struct(pid, (void *) ptr+i, &phdr,
+ sizeof(Elf32_Phdr));
+ /* Found a EXIDX segment? */
+ if (phdr.p_type == PT_ARM_EXIDX) {
+ mi->exidx_start = mi->start + phdr.p_offset;
+ mi->exidx_end = mi->exidx_start + phdr.p_filesz;
+ break;
+ }
+ }
+ }
+ }
+}
+
+void dump_crash_report(int tfd, unsigned pid, unsigned tid, bool at_fault)
+{
+ char data[1024];
+ FILE *fp;
+ mapinfo *milist = 0;
+ unsigned int sp_list[STACK_CONTENT_DEPTH];
+ int stack_depth;
+ int frame0_pc_sane = 1;
+
+ if (!at_fault) {
+ _LOG(tfd, true,
+ "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
+ _LOG(tfd, true, "pid: %d, tid: %d\n", pid, tid);
+ }
+
+ dump_registers(tfd, tid, at_fault);
+
+ /* Clear stack pointer records */
+ memset(sp_list, 0, sizeof(sp_list));
+
+ sprintf(data, "/proc/%d/maps", pid);
+ fp = fopen(data, "r");
+ if(fp) {
+ while(fgets(data, 1024, fp)) {
+ mapinfo *mi = parse_maps_line(data);
+ if(mi) {
+ mi->next = milist;
+ milist = mi;
+ }
+ }
+ fclose(fp);
+ }
+
+ parse_exidx_info(milist, tid);
+
+ /* If stack unwinder fails, use the default solution to dump the stack
+ * content.
+ */
+ stack_depth = unwind_backtrace_with_ptrace(tfd, tid, milist, sp_list,
+ &frame0_pc_sane, at_fault);
+
+ /* The stack unwinder should at least unwind two levels of stack. If less
+ * level is seen we make sure at lease pc and lr are dumped.
+ */
+ if (stack_depth < 2) {
+ dump_pc_and_lr(tfd, tid, milist, stack_depth, at_fault);
+ }
+
+ dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, frame0_pc_sane,
+ at_fault);
+
+ while(milist) {
+ mapinfo *next = milist->next;
+ free(milist);
+ milist = next;
+ }
+}
+
+/* FIXME: unused: use it or lose it*/
+#if 0
+static
+void start_gdbserver_vs(int pid, int port)
+{
+ pid_t p;
+ char *args[5];
+ char commspec[16];
+ char pidspec[16];
+
+ p = fork();
+ if(p < 0) {
+ LOG("could not fork()\n");
+ return;
+ }
+
+ if(p == 0) {
+ sprintf(commspec, ":%d", port);
+ sprintf(pidspec, "%d", pid);
+ args[0] = "/system/bin/gdbserver";
+ args[1] = commspec;
+ args[2] = "--attach";
+ args[3] = pidspec;
+ args[4] = 0;
+ exit(execv(args[0], args));
+ } else {
+ LOG("gdbserver pid=%d port=%d targetpid=%d\n",
+ p, port, pid);
+
+ sleep(5);
+ }
+}
+#endif
+
+#define MAX_TOMBSTONES 10
+
+#define typecheck(x,y) { \
+ typeof(x) __dummy1; \
+ typeof(y) __dummy2; \
+ (void)(&__dummy1 == &__dummy2); }
+
+#define TOMBSTONE_DIR "/data/tombstones"
+
+/*
+ * find_and_open_tombstone - find an available tombstone slot, if any, of the
+ * form tombstone_XX where XX is 00 to MAX_TOMBSTONES-1, inclusive. If no
+ * file is available, we reuse the least-recently-modified file.
+ */
+static int find_and_open_tombstone(void)
+{
+ unsigned long mtime = ULONG_MAX;
+ struct stat sb;
+ char path[128];
+ int fd, i, oldest = 0;
+
+ /*
+ * XXX: Our stat.st_mtime isn't time_t. If it changes, as it probably ought
+ * to, our logic breaks. This check will generate a warning if that happens.
+ */
+ typecheck(mtime, sb.st_mtime);
+
+ /*
+ * In a single wolf-like pass, find an available slot and, in case none
+ * exist, find and record the least-recently-modified file.
+ */
+ for (i = 0; i < MAX_TOMBSTONES; i++) {
+ snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", i);
+
+ if (!stat(path, &sb)) {
+ if (sb.st_mtime < mtime) {
+ oldest = i;
+ mtime = sb.st_mtime;
+ }
+ continue;
+ }
+ if (errno != ENOENT)
+ continue;
+
+ fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0600);
+ if (fd < 0)
+ continue; /* raced ? */
+
+ fchown(fd, AID_SYSTEM, AID_SYSTEM);
+ return fd;
+ }
+
+ /* we didn't find an available file, so we clobber the oldest one */
+ snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", oldest);
+ fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+ fchown(fd, AID_SYSTEM, AID_SYSTEM);
+
+ return fd;
+}
+
+/* Return true if some thread is not detached cleanly */
+static bool dump_sibling_thread_report(int tfd, unsigned pid, unsigned tid)
+{
+ char task_path[1024];
+
+ sprintf(task_path, "/proc/%d/task", pid);
+ DIR *d;
+ struct dirent *de;
+ int need_cleanup = 0;
+
+ d = opendir(task_path);
+ /* Bail early if cannot open the task directory */
+ if (d == NULL) {
+ XLOG("Cannot open /proc/%d/task\n", pid);
+ return false;
+ }
+ while ((de = readdir(d)) != NULL) {
+ unsigned new_tid;
+ /* Ignore "." and ".." */
+ if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
+ continue;
+ new_tid = atoi(de->d_name);
+ /* The main thread at fault has been handled individually */
+ if (new_tid == tid)
+ continue;
+
+ /* Skip this thread if cannot ptrace it */
+ if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0)
+ continue;
+
+ dump_crash_report(tfd, pid, new_tid, false);
+ need_cleanup |= ptrace(PTRACE_DETACH, new_tid, 0, 0);
+ }
+ closedir(d);
+ return need_cleanup != 0;
+}
+
+/* Return true if some thread is not detached cleanly */
+static bool engrave_tombstone(unsigned pid, unsigned tid, int debug_uid,
+ int signal)
+{
+ int fd;
+ bool need_cleanup = false;
+
+ mkdir(TOMBSTONE_DIR, 0755);
+ chown(TOMBSTONE_DIR, AID_SYSTEM, AID_SYSTEM);
+
+ fd = find_and_open_tombstone();
+ if (fd < 0)
+ return need_cleanup;
+
+ dump_crash_banner(fd, pid, tid, signal);
+ dump_crash_report(fd, pid, tid, true);
+ /*
+ * If the user has requested to attach gdb, don't collect the per-thread
+ * information as it increases the chance to lose track of the process.
+ */
+ if ((signed)pid > debug_uid) {
+ need_cleanup = dump_sibling_thread_report(fd, pid, tid);
+ }
+
+ close(fd);
+ return need_cleanup;
+}
+
+static int
+write_string(const char* file, const char* string)
+{
+ int len;
+ int fd;
+ ssize_t amt;
+ fd = open(file, O_RDWR);
+ len = strlen(string);
+ if (fd < 0)
+ return -errno;
+ amt = write(fd, string, len);
+ close(fd);
+ return amt >= 0 ? 0 : -errno;
+}
+
+static
+void init_debug_led(void)
+{
+ // trout leds
+ write_string("/sys/class/leds/red/brightness", "0");
+ write_string("/sys/class/leds/green/brightness", "0");
+ write_string("/sys/class/leds/blue/brightness", "0");
+ write_string("/sys/class/leds/red/device/blink", "0");
+ // sardine leds
+ write_string("/sys/class/leds/left/cadence", "0,0");
+}
+
+static
+void enable_debug_led(void)
+{
+ // trout leds
+ write_string("/sys/class/leds/red/brightness", "255");
+ // sardine leds
+ write_string("/sys/class/leds/left/cadence", "1,0");
+}
+
+static
+void disable_debug_led(void)
+{
+ // trout leds
+ write_string("/sys/class/leds/red/brightness", "0");
+ // sardine leds
+ write_string("/sys/class/leds/left/cadence", "0,0");
+}
+
+extern int init_getevent();
+extern void uninit_getevent();
+extern int get_event(struct input_event* event, int timeout);
+
+static void wait_for_user_action(unsigned tid, struct ucred* cr)
+{
+ (void)tid;
+ /* First log a helpful message */
+ LOG( "********************************************************\n"
+ "* process %d crashed. debuggerd waiting for gdbserver \n"
+ "* \n"
+ "* adb shell gdbserver :port --attach %d & \n"
+ "* \n"
+ "* and press the HOME key. \n"
+ "********************************************************\n",
+ cr->pid, cr->pid);
+
+ /* wait for HOME key */
+ if (init_getevent() == 0) {
+ int ms = 1200 / 10;
+ int dit = 1;
+ int dah = 3*dit;
+ int _ = -dit;
+ int ___ = 3*_;
+ int _______ = 7*_;
+ const signed char codes[] = {
+ dit,_,dit,_,dit,___,dah,_,dah,_,dah,___,dit,_,dit,_,dit,_______
+ };
+ size_t s = 0;
+ struct input_event e;
+ int home = 0;
+ init_debug_led();
+ enable_debug_led();
+ do {
+ int timeout = abs((int)(codes[s])) * ms;
+ int res = get_event(&e, timeout);
+ if (res == 0) {
+ if (e.type==EV_KEY && e.code==KEY_HOME && e.value==0)
+ home = 1;
+ } else if (res == 1) {
+ if (++s >= sizeof(codes)/sizeof(*codes))
+ s = 0;
+ if (codes[s] > 0) {
+ enable_debug_led();
+ } else {
+ disable_debug_led();
+ }
+ }
+ } while (!home);
+ uninit_getevent();
+ }
+
+ /* don't forget to turn debug led off */
+ disable_debug_led();
+
+ /* close filedescriptor */
+ LOG("debuggerd resuming process %d", cr->pid);
+ }
+
+static void handle_crashing_process(int fd)
+{
+ char buf[64];
+ struct stat s;
+ unsigned tid;
+ struct ucred cr;
+ int n, len, status;
+ int tid_attach_status = -1;
+ unsigned retry = 30;
+ bool need_cleanup = false;
+
+ char value[PROPERTY_VALUE_MAX];
+ property_get("debug.db.uid", value, "-1");
+ int debug_uid = atoi(value);
+
+ XLOG("handle_crashing_process(%d)\n", fd);
+
+ len = sizeof(cr);
+ n = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len);
+ if(n != 0) {
+ LOG("cannot get credentials\n");
+ goto done;
+ }
+
+ XLOG("reading tid\n");
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+ while((n = read(fd, &tid, sizeof(unsigned))) != sizeof(unsigned)) {
+ if(errno == EINTR) continue;
+ if(errno == EWOULDBLOCK) {
+ if(retry-- > 0) {
+ usleep(100 * 1000);
+ continue;
+ }
+ LOG("timed out reading tid\n");
+ goto done;
+ }
+ LOG("read failure? %s\n", strerror(errno));
+ goto done;
+ }
+
+ sprintf(buf,"/proc/%d/task/%d", cr.pid, tid);
+ if(stat(buf, &s)) {
+ LOG("tid %d does not exist in pid %d. ignorning debug request\n",
+ tid, cr.pid);
+ close(fd);
+ return;
+ }
+
+ XLOG("BOOM: pid=%d uid=%d gid=%d tid=%d\n", cr.pid, cr.uid, cr.gid, tid);
+
+ tid_attach_status = ptrace(PTRACE_ATTACH, tid, 0, 0);
+ if(tid_attach_status < 0) {
+ LOG("ptrace attach failed: %s\n", strerror(errno));
+ goto done;
+ }
+
+ close(fd);
+ fd = -1;
+
+ for(;;) {
+ n = waitpid(tid, &status, __WALL);
+
+ if(n < 0) {
+ if(errno == EAGAIN) continue;
+ LOG("waitpid failed: %s\n", strerror(errno));
+ goto done;
+ }
+
+ XLOG("waitpid: n=%d status=%08x\n", n, status);
+
+ if(WIFSTOPPED(status)){
+ n = WSTOPSIG(status);
+ switch(n) {
+ case SIGSTOP:
+ XLOG("stopped -- continuing\n");
+ n = ptrace(PTRACE_CONT, tid, 0, 0);
+ if(n) {
+ LOG("ptrace failed: %s\n", strerror(errno));
+ goto done;
+ }
+ continue;
+
+ case SIGILL:
+ case SIGABRT:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGSTKFLT: {
+ XLOG("stopped -- fatal signal\n");
+ need_cleanup = engrave_tombstone(cr.pid, tid, debug_uid, n);
+ kill(tid, SIGSTOP);
+ goto done;
+ }
+
+ default:
+ XLOG("stopped -- unexpected signal\n");
+ goto done;
+ }
+ } else {
+ XLOG("unexpected waitpid response\n");
+ goto done;
+ }
+ }
+
+done:
+ XLOG("detaching\n");
+
+ /* stop the process so we can debug */
+ kill(cr.pid, SIGSTOP);
+
+ /*
+ * If a thread has been attached by ptrace, make sure it is detached
+ * successfully otherwise we will get a zombie.
+ */
+ if (tid_attach_status == 0) {
+ int detach_status;
+ /* detach so we can attach gdbserver */
+ detach_status = ptrace(PTRACE_DETACH, tid, 0, 0);
+ need_cleanup |= (detach_status != 0);
+ }
+
+ /*
+ * if debug.db.uid is set, its value indicates if we should wait
+ * for user action for the crashing process.
+ * in this case, we log a message and turn the debug LED on
+ * waiting for a gdb connection (for instance)
+ */
+
+ if ((signed)cr.uid <= debug_uid) {
+ wait_for_user_action(tid, &cr);
+ }
+
+ /* resume stopped process (so it can crash in peace) */
+ kill(cr.pid, SIGCONT);
+
+ if (need_cleanup) {
+ LOG("debuggerd committing suicide to free the zombie!\n");
+ kill(getpid(), SIGKILL);
+ }
+
+ if(fd != -1) close(fd);
+}
+
+int main(int argc, char **argv)
+{
+ int s;
+ struct sigaction act;
+
+ process_name_ptr = argv;
+
+ logsocket = socket_local_client("logd",
+ ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM);
+ if(logsocket < 0) {
+ logsocket = -1;
+ } else {
+ fcntl(logsocket, F_SETFD, FD_CLOEXEC);
+ }
+
+ act.sa_handler = SIG_DFL;
+ sigemptyset(&act.sa_mask);
+ sigaddset(&act.sa_mask,SIGCHLD);
+ act.sa_flags = SA_NOCLDWAIT;
+ sigaction(SIGCHLD, &act, 0);
+
+ s = socket_local_server("android:debuggerd",
+ ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
+ if(s < 0) return -1;
+ fcntl(s, F_SETFD, FD_CLOEXEC);
+
+ LOG("debuggerd: " __DATE__ " " __TIME__ "\n");
+
+ for(;;) {
+ struct sockaddr addr;
+ socklen_t alen;
+ int fd;
+
+ alen = sizeof(addr);
+ fd = accept(s, &addr, &alen);
+ if(fd < 0) continue;
+
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
+
+ handle_crashing_process(fd);
+ }
+ return 0;
+}
diff --git a/debuggerd/getevent.c b/debuggerd/getevent.c
new file mode 100644
index 0000000..ebd070c
--- /dev/null
+++ b/debuggerd/getevent.c
@@ -0,0 +1,219 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/inotify.h>
+#include <sys/limits.h>
+#include <sys/poll.h>
+#include <linux/input.h>
+#include <errno.h>
+#include <cutils/log.h>
+
+static struct pollfd *ufds;
+static char **device_names;
+static int nfds;
+
+static int open_device(const char *device)
+{
+ int version;
+ int fd;
+ struct pollfd *new_ufds;
+ char **new_device_names;
+ char name[80];
+ char location[80];
+ char idstr[80];
+ struct input_id id;
+
+ fd = open(device, O_RDWR);
+ if(fd < 0) {
+ return -1;
+ }
+
+ if(ioctl(fd, EVIOCGVERSION, &version)) {
+ return -1;
+ }
+ if(ioctl(fd, EVIOCGID, &id)) {
+ return -1;
+ }
+ name[sizeof(name) - 1] = '\0';
+ location[sizeof(location) - 1] = '\0';
+ idstr[sizeof(idstr) - 1] = '\0';
+ if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
+ //fprintf(stderr, "could not get device name for %s, %s\n", device, strerror(errno));
+ name[0] = '\0';
+ }
+ if(ioctl(fd, EVIOCGPHYS(sizeof(location) - 1), &location) < 1) {
+ //fprintf(stderr, "could not get location for %s, %s\n", device, strerror(errno));
+ location[0] = '\0';
+ }
+ if(ioctl(fd, EVIOCGUNIQ(sizeof(idstr) - 1), &idstr) < 1) {
+ //fprintf(stderr, "could not get idstring for %s, %s\n", device, strerror(errno));
+ idstr[0] = '\0';
+ }
+
+ new_ufds = realloc(ufds, sizeof(ufds[0]) * (nfds + 1));
+ if(new_ufds == NULL) {
+ fprintf(stderr, "out of memory\n");
+ return -1;
+ }
+ ufds = new_ufds;
+ new_device_names = realloc(device_names, sizeof(device_names[0]) * (nfds + 1));
+ if(new_device_names == NULL) {
+ fprintf(stderr, "out of memory\n");
+ return -1;
+ }
+ device_names = new_device_names;
+ ufds[nfds].fd = fd;
+ ufds[nfds].events = POLLIN;
+ device_names[nfds] = strdup(device);
+ nfds++;
+
+ return 0;
+}
+
+int close_device(const char *device)
+{
+ int i;
+ for(i = 1; i < nfds; i++) {
+ if(strcmp(device_names[i], device) == 0) {
+ int count = nfds - i - 1;
+ free(device_names[i]);
+ memmove(device_names + i, device_names + i + 1, sizeof(device_names[0]) * count);
+ memmove(ufds + i, ufds + i + 1, sizeof(ufds[0]) * count);
+ nfds--;
+ return 0;
+ }
+ }
+ return -1;
+}
+
+static int read_notify(const char *dirname, int nfd)
+{
+ int res;
+ char devname[PATH_MAX];
+ char *filename;
+ char event_buf[512];
+ int event_size;
+ int event_pos = 0;
+ struct inotify_event *event;
+
+ res = read(nfd, event_buf, sizeof(event_buf));
+ if(res < (int)sizeof(*event)) {
+ if(errno == EINTR)
+ return 0;
+ fprintf(stderr, "could not get event, %s\n", strerror(errno));
+ return 1;
+ }
+ //printf("got %d bytes of event information\n", res);
+
+ strcpy(devname, dirname);
+ filename = devname + strlen(devname);
+ *filename++ = '/';
+
+ while(res >= (int)sizeof(*event)) {
+ event = (struct inotify_event *)(event_buf + event_pos);
+ //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
+ if(event->len) {
+ strcpy(filename, event->name);
+ if(event->mask & IN_CREATE) {
+ open_device(devname);
+ }
+ else {
+ close_device(devname);
+ }
+ }
+ event_size = sizeof(*event) + event->len;
+ res -= event_size;
+ event_pos += event_size;
+ }
+ return 0;
+}
+
+static int scan_dir(const char *dirname)
+{
+ char devname[PATH_MAX];
+ char *filename;
+ DIR *dir;
+ struct dirent *de;
+ dir = opendir(dirname);
+ if(dir == NULL)
+ return -1;
+ strcpy(devname, dirname);
+ filename = devname + strlen(devname);
+ *filename++ = '/';
+ while((de = readdir(dir))) {
+ if(de->d_name[0] == '.' &&
+ (de->d_name[1] == '\0' ||
+ (de->d_name[1] == '.' && de->d_name[2] == '\0')))
+ continue;
+ strcpy(filename, de->d_name);
+ open_device(devname);
+ }
+ closedir(dir);
+ return 0;
+}
+
+int init_getevent()
+{
+ int res;
+ const char *device_path = "/dev/input";
+
+ nfds = 1;
+ ufds = calloc(1, sizeof(ufds[0]));
+ ufds[0].fd = inotify_init();
+ ufds[0].events = POLLIN;
+
+ res = inotify_add_watch(ufds[0].fd, device_path, IN_DELETE | IN_CREATE);
+ if(res < 0) {
+ return 1;
+ }
+ res = scan_dir(device_path);
+ if(res < 0) {
+ return 1;
+ }
+ return 0;
+}
+
+void uninit_getevent()
+{
+ int i;
+ for(i = 0; i < nfds; i++) {
+ close(ufds[i].fd);
+ }
+ free(ufds);
+ ufds = 0;
+ nfds = 0;
+}
+
+int get_event(struct input_event* event, int timeout)
+{
+ int res;
+ int i;
+ int pollres;
+ const char *device_path = "/dev/input";
+ while(1) {
+ pollres = poll(ufds, nfds, timeout);
+ if (pollres == 0) {
+ return 1;
+ }
+ if(ufds[0].revents & POLLIN) {
+ read_notify(device_path, ufds[0].fd);
+ }
+ for(i = 1; i < nfds; i++) {
+ if(ufds[i].revents) {
+ if(ufds[i].revents & POLLIN) {
+ res = read(ufds[i].fd, event, sizeof(*event));
+ if(res < (int)sizeof(event)) {
+ fprintf(stderr, "could not get event\n");
+ return -1;
+ }
+ return 0;
+ }
+ }
+ }
+ }
+ return 0;
+}
diff --git a/debuggerd/pr-support.c b/debuggerd/pr-support.c
new file mode 100644
index 0000000..358d9b7
--- /dev/null
+++ b/debuggerd/pr-support.c
@@ -0,0 +1,345 @@
+/* ARM EABI compliant unwinding routines
+ Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+ Contributed by Paul Brook
+
+ This file is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option) any
+ later version.
+
+ In addition to the permissions in the GNU General Public License, the
+ Free Software Foundation gives you unlimited permission to link the
+ compiled version of this file into combinations with other programs,
+ and to distribute those combinations without any restriction coming
+ from the use of this file. (The General Public License restrictions
+ do apply in other respects; for example, they cover modification of
+ the file, and distribution when not linked into a combine
+ executable.)
+
+ This file is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+/****************************************************************************
+ * The functions here are derived from gcc/config/arm/pr-support.c from the
+ * 4.3.x release. The main changes here involve the use of ptrace to retrieve
+ * memory/processor states from a remote process.
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <unwind.h>
+
+#include "utility.h"
+
+/* We add a prototype for abort here to avoid creating a dependency on
+ target headers. */
+extern void abort (void);
+
+/* Derived from _Unwind_VRS_Pop to use ptrace */
+extern _Unwind_VRS_Result
+unwind_VRS_Pop_with_ptrace (_Unwind_Context *context,
+ _Unwind_VRS_RegClass regclass,
+ _uw discriminator,
+ _Unwind_VRS_DataRepresentation representation,
+ pid_t pid);
+
+typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
+
+/* Misc constants. */
+#define R_IP 12
+#define R_SP 13
+#define R_LR 14
+#define R_PC 15
+
+#define uint32_highbit (((_uw) 1) << 31)
+
+void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
+
+/* Unwind descriptors. */
+
+typedef struct
+{
+ _uw16 length;
+ _uw16 offset;
+} EHT16;
+
+typedef struct
+{
+ _uw length;
+ _uw offset;
+} EHT32;
+
+/* Personality routine helper functions. */
+
+#define CODE_FINISH (0xb0)
+
+/* Derived from next_unwind_byte to use ptrace */
+/* Return the next byte of unwinding information, or CODE_FINISH if there is
+ no data remaining. */
+static inline _uw8
+next_unwind_byte_with_ptrace (__gnu_unwind_state * uws, pid_t pid)
+{
+ _uw8 b;
+
+ if (uws->bytes_left == 0)
+ {
+ /* Load another word */
+ if (uws->words_left == 0)
+ return CODE_FINISH; /* Nothing left. */
+ uws->words_left--;
+ uws->data = get_remote_word(pid, uws->next);
+ uws->next++;
+ uws->bytes_left = 3;
+ }
+ else
+ uws->bytes_left--;
+
+ /* Extract the most significant byte. */
+ b = (uws->data >> 24) & 0xff;
+ uws->data <<= 8;
+ return b;
+}
+
+/* Execute the unwinding instructions described by UWS. */
+_Unwind_Reason_Code
+unwind_execute_with_ptrace(_Unwind_Context * context, __gnu_unwind_state * uws,
+ pid_t pid)
+{
+ _uw op;
+ int set_pc;
+ _uw reg;
+
+ set_pc = 0;
+ for (;;)
+ {
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ if (op == CODE_FINISH)
+ {
+ /* If we haven't already set pc then copy it from lr. */
+ if (!set_pc)
+ {
+ _Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,
+ ®);
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,
+ ®);
+ set_pc = 1;
+ }
+ /* Drop out of the loop. */
+ break;
+ }
+ if ((op & 0x80) == 0)
+ {
+ /* vsp = vsp +- (imm6 << 2 + 4). */
+ _uw offset;
+
+ offset = ((op & 0x3f) << 2) + 4;
+ _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, ®);
+ if (op & 0x40)
+ reg -= offset;
+ else
+ reg += offset;
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, ®);
+ continue;
+ }
+
+ if ((op & 0xf0) == 0x80)
+ {
+ op = (op << 8) | next_unwind_byte_with_ptrace (uws, pid);
+ if (op == 0x8000)
+ {
+ /* Refuse to unwind. */
+ return _URC_FAILURE;
+ }
+ /* Pop r4-r15 under mask. */
+ op = (op << 4) & 0xfff0;
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, op, _UVRSD_UINT32,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ if (op & (1 << R_PC))
+ set_pc = 1;
+ continue;
+ }
+ if ((op & 0xf0) == 0x90)
+ {
+ op &= 0xf;
+ if (op == 13 || op == 15)
+ /* Reserved. */
+ return _URC_FAILURE;
+ /* vsp = r[nnnn]. */
+ _Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, ®);
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, ®);
+ continue;
+ }
+ if ((op & 0xf0) == 0xa0)
+ {
+ /* Pop r4-r[4+nnn], [lr]. */
+ _uw mask;
+
+ mask = (0xff0 >> (7 - (op & 7))) & 0xff0;
+ if (op & 8)
+ mask |= (1 << R_LR);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, mask, _UVRSD_UINT32,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xf0) == 0xb0)
+ {
+ /* op == 0xb0 already handled. */
+ if (op == 0xb1)
+ {
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ if (op == 0 || ((op & 0xf0) != 0))
+ /* Spare. */
+ return _URC_FAILURE;
+ /* Pop r0-r4 under mask. */
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, op,
+ _UVRSD_UINT32, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if (op == 0xb2)
+ {
+ /* vsp = vsp + 0x204 + (uleb128 << 2). */
+ int shift;
+
+ _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
+ ®);
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ shift = 2;
+ while (op & 0x80)
+ {
+ reg += ((op & 0x7f) << shift);
+ shift += 7;
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ }
+ reg += ((op & 0x7f) << shift) + 0x204;
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
+ ®);
+ continue;
+ }
+ if (op == 0xb3)
+ {
+ /* Pop VFP registers with fldmx. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_VFPX,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xfc) == 0xb4)
+ {
+ /* Pop FPA E[4]-E[4+nn]. */
+ op = 0x40000 | ((op & 3) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_FPA, op, _UVRSD_FPAX,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ /* op & 0xf8 == 0xb8. */
+ /* Pop VFP D[8]-D[8+nnn] with fldmx. */
+ op = 0x80000 | ((op & 7) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_VFPX, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xf0) == 0xc0)
+ {
+ if (op == 0xc6)
+ {
+ /* Pop iWMMXt D registers. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXD, op,
+ _UVRSD_UINT64, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if (op == 0xc7)
+ {
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ if (op == 0 || (op & 0xf0) != 0)
+ /* Spare. */
+ return _URC_FAILURE;
+ /* Pop iWMMXt wCGR{3,2,1,0} under mask. */
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXC, op,
+ _UVRSD_UINT32, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xf8) == 0xc0)
+ {
+ /* Pop iWMMXt wR[10]-wR[10+nnn]. */
+ op = 0xa0000 | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXD, op,
+ _UVRSD_UINT64, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if (op == 0xc8)
+ {
+#ifndef __VFP_FP__
+ /* Pop FPA registers. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_FPA, op, _UVRSD_FPAX,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+#else
+ /* Pop VFPv3 registers D[16+ssss]-D[16+ssss+cccc] with vldm. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = (((op & 0xf0) + 16) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op,
+ _UVRSD_DOUBLE, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+#endif
+ }
+ if (op == 0xc9)
+ {
+ /* Pop VFP registers with fldmd. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op,
+ _UVRSD_DOUBLE, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ /* Spare. */
+ return _URC_FAILURE;
+ }
+ if ((op & 0xf8) == 0xd0)
+ {
+ /* Pop VFP D[8]-D[8+nnn] with fldmd. */
+ op = 0x80000 | ((op & 7) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_DOUBLE,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ /* Spare. */
+ return _URC_FAILURE;
+ }
+ return _URC_OK;
+}
diff --git a/debuggerd/unwind-arm.c b/debuggerd/unwind-arm.c
new file mode 100644
index 0000000..9642d2e
--- /dev/null
+++ b/debuggerd/unwind-arm.c
@@ -0,0 +1,654 @@
+/* ARM EABI compliant unwinding routines.
+ Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+ Contributed by Paul Brook
+
+ This file is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option) any
+ later version.
+
+ In addition to the permissions in the GNU General Public License, the
+ Free Software Foundation gives you unlimited permission to link the
+ compiled version of this file into combinations with other programs,
+ and to distribute those combinations without any restriction coming
+ from the use of this file. (The General Public License restrictions
+ do apply in other respects; for example, they cover modification of
+ the file, and distribution when not linked into a combine
+ executable.)
+
+ This file is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+/****************************************************************************
+ * The functions here are derived from gcc/config/arm/unwind-arm.c from the
+ * 4.3.x release. The main changes here involve the use of ptrace to retrieve
+ * memory/processor states from a remote process.
+ ****************************************************************************/
+
+#include <cutils/logd.h>
+#include <sys/ptrace.h>
+#include <unwind.h>
+#include "utility.h"
+
+typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
+
+void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
+bool __attribute__((weak)) __cxa_begin_cleanup(_Unwind_Control_Block *ucbp);
+bool __attribute__((weak)) __cxa_type_match(_Unwind_Control_Block *ucbp,
+ const type_info *rttip,
+ bool is_reference,
+ void **matched_object);
+
+/* Misc constants. */
+#define R_IP 12
+#define R_SP 13
+#define R_LR 14
+#define R_PC 15
+
+#define EXIDX_CANTUNWIND 1
+#define uint32_highbit (((_uw) 1) << 31)
+
+#define UCB_FORCED_STOP_FN(ucbp) ((ucbp)->unwinder_cache.reserved1)
+#define UCB_PR_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved2)
+#define UCB_SAVED_CALLSITE_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved3)
+#define UCB_FORCED_STOP_ARG(ucbp) ((ucbp)->unwinder_cache.reserved4)
+
+struct core_regs
+{
+ _uw r[16];
+};
+
+/* We use normal integer types here to avoid the compiler generating
+ coprocessor instructions. */
+struct vfp_regs
+{
+ _uw64 d[16];
+ _uw pad;
+};
+
+struct vfpv3_regs
+{
+ /* Always populated via VSTM, so no need for the "pad" field from
+ vfp_regs (which is used to store the format word for FSTMX). */
+ _uw64 d[16];
+};
+
+struct fpa_reg
+{
+ _uw w[3];
+};
+
+struct fpa_regs
+{
+ struct fpa_reg f[8];
+};
+
+struct wmmxd_regs
+{
+ _uw64 wd[16];
+};
+
+struct wmmxc_regs
+{
+ _uw wc[4];
+};
+
+/* Unwind descriptors. */
+
+typedef struct
+{
+ _uw16 length;
+ _uw16 offset;
+} EHT16;
+
+typedef struct
+{
+ _uw length;
+ _uw offset;
+} EHT32;
+
+/* The ABI specifies that the unwind routines may only use core registers,
+ except when actually manipulating coprocessor state. This allows
+ us to write one implementation that works on all platforms by
+ demand-saving coprocessor registers.
+
+ During unwinding we hold the coprocessor state in the actual hardware
+ registers and allocate demand-save areas for use during phase1
+ unwinding. */
+
+typedef struct
+{
+ /* The first fields must be the same as a phase2_vrs. */
+ _uw demand_save_flags;
+ struct core_regs core;
+ _uw prev_sp; /* Only valid during forced unwinding. */
+ struct vfp_regs vfp;
+ struct vfpv3_regs vfp_regs_16_to_31;
+ struct fpa_regs fpa;
+ struct wmmxd_regs wmmxd;
+ struct wmmxc_regs wmmxc;
+} phase1_vrs;
+
+/* This must match the structure created by the assembly wrappers. */
+typedef struct
+{
+ _uw demand_save_flags;
+ struct core_regs core;
+} phase2_vrs;
+
+
+/* An exception index table entry. */
+
+typedef struct __EIT_entry
+{
+ _uw fnoffset;
+ _uw content;
+} __EIT_entry;
+
+/* Derived version to use ptrace */
+typedef _Unwind_Reason_Code (*personality_routine_with_ptrace)
+ (_Unwind_State,
+ _Unwind_Control_Block *,
+ _Unwind_Context *,
+ pid_t);
+
+/* Derived version to use ptrace */
+/* ABI defined personality routines. */
+static _Unwind_Reason_Code unwind_cpp_pr0_with_ptrace (_Unwind_State,
+ _Unwind_Control_Block *, _Unwind_Context *, pid_t);
+static _Unwind_Reason_Code unwind_cpp_pr1_with_ptrace (_Unwind_State,
+ _Unwind_Control_Block *, _Unwind_Context *, pid_t);
+static _Unwind_Reason_Code unwind_cpp_pr2_with_ptrace (_Unwind_State,
+ _Unwind_Control_Block *, _Unwind_Context *, pid_t);
+
+/* Execute the unwinding instructions described by UWS. */
+extern _Unwind_Reason_Code
+unwind_execute_with_ptrace(_Unwind_Context * context, __gnu_unwind_state * uws,
+ pid_t pid);
+
+/* Derived version to use ptrace. Only handles core registers. Disregards
+ * FP and others.
+ */
+/* ABI defined function to pop registers off the stack. */
+
+_Unwind_VRS_Result unwind_VRS_Pop_with_ptrace (_Unwind_Context *context,
+ _Unwind_VRS_RegClass regclass,
+ _uw discriminator,
+ _Unwind_VRS_DataRepresentation representation,
+ pid_t pid)
+{
+ phase1_vrs *vrs = (phase1_vrs *) context;
+
+ switch (regclass)
+ {
+ case _UVRSC_CORE:
+ {
+ _uw *ptr;
+ _uw mask;
+ int i;
+
+ if (representation != _UVRSD_UINT32)
+ return _UVRSR_FAILED;
+
+ mask = discriminator & 0xffff;
+ ptr = (_uw *) vrs->core.r[R_SP];
+ /* Pop the requested registers. */
+ for (i = 0; i < 16; i++)
+ {
+ if (mask & (1 << i)) {
+ vrs->core.r[i] = get_remote_word(pid, ptr);
+ ptr++;
+ }
+ }
+ /* Writeback the stack pointer value if it wasn't restored. */
+ if ((mask & (1 << R_SP)) == 0)
+ vrs->core.r[R_SP] = (_uw) ptr;
+ }
+ return _UVRSR_OK;
+
+ default:
+ return _UVRSR_FAILED;
+ }
+}
+
+/* Core unwinding functions. */
+
+/* Calculate the address encoded by a 31-bit self-relative offset at address
+ P. */
+static inline _uw
+selfrel_offset31 (const _uw *p, pid_t pid)
+{
+ _uw offset = get_remote_word(pid, (void*)p);
+
+ //offset = *p;
+ /* Sign extend to 32 bits. */
+ if (offset & (1 << 30))
+ offset |= 1u << 31;
+ else
+ offset &= ~(1u << 31);
+
+ return offset + (_uw) p;
+}
+
+
+/* Perform a binary search for RETURN_ADDRESS in TABLE. The table contains
+ NREC entries. */
+
+static const __EIT_entry *
+search_EIT_table (const __EIT_entry * table, int nrec, _uw return_address,
+ pid_t pid)
+{
+ _uw next_fn;
+ _uw this_fn;
+ int n, left, right;
+
+ if (nrec == 0)
+ return (__EIT_entry *) 0;
+
+ left = 0;
+ right = nrec - 1;
+
+ while (1)
+ {
+ n = (left + right) / 2;
+ this_fn = selfrel_offset31 (&table[n].fnoffset, pid);
+ if (n != nrec - 1)
+ next_fn = selfrel_offset31 (&table[n + 1].fnoffset, pid) - 1;
+ else
+ next_fn = (_uw)0 - 1;
+
+ if (return_address < this_fn)
+ {
+ if (n == left)
+ return (__EIT_entry *) 0;
+ right = n - 1;
+ }
+ else if (return_address <= next_fn)
+ return &table[n];
+ else
+ left = n + 1;
+ }
+}
+
+/* Find the exception index table eintry for the given address. */
+static const __EIT_entry*
+get_eitp(_uw return_address, pid_t pid, mapinfo *map, mapinfo **containing_map)
+{
+ const __EIT_entry *eitp = NULL;
+ int nrec;
+ mapinfo *mi;
+
+ /* The return address is the address of the instruction following the
+ call instruction (plus one in thumb mode). If this was the last
+ instruction in the function the address will lie in the following
+ function. Subtract 2 from the address so that it points within the call
+ instruction itself. */
+ if (return_address >= 2)
+ return_address -= 2;
+
+ for (mi = map; mi != NULL; mi = mi->next) {
+ if (return_address >= mi->start && return_address <= mi->end) break;
+ }
+
+ if (mi) {
+ if (containing_map) *containing_map = mi;
+ eitp = (__EIT_entry *) mi->exidx_start;
+ nrec = (mi->exidx_end - mi->exidx_start)/sizeof(__EIT_entry);
+ eitp = search_EIT_table (eitp, nrec, return_address, pid);
+ }
+ return eitp;
+}
+
+/* Find the exception index table eintry for the given address.
+ Fill in the relevant fields of the UCB.
+ Returns _URC_FAILURE if an error occurred, _URC_OK on success. */
+
+static _Unwind_Reason_Code
+get_eit_entry (_Unwind_Control_Block *ucbp, _uw return_address, pid_t pid,
+ mapinfo *map, mapinfo **containing_map)
+{
+ const __EIT_entry *eitp;
+
+ eitp = get_eitp(return_address, pid, map, containing_map);
+
+ if (!eitp)
+ {
+ UCB_PR_ADDR (ucbp) = 0;
+ return _URC_FAILURE;
+ }
+ ucbp->pr_cache.fnstart = selfrel_offset31 (&eitp->fnoffset, pid);
+
+ _uw eitp_content = get_remote_word(pid, (void *)&eitp->content);
+
+ /* Can this frame be unwound at all? */
+ if (eitp_content == EXIDX_CANTUNWIND)
+ {
+ UCB_PR_ADDR (ucbp) = 0;
+ return _URC_END_OF_STACK;
+ }
+
+ /* Obtain the address of the "real" __EHT_Header word. */
+
+ if (eitp_content & uint32_highbit)
+ {
+ /* It is immediate data. */
+ ucbp->pr_cache.ehtp = (_Unwind_EHT_Header *)&eitp->content;
+ ucbp->pr_cache.additional = 1;
+ }
+ else
+ {
+ /* The low 31 bits of the content field are a self-relative
+ offset to an _Unwind_EHT_Entry structure. */
+ ucbp->pr_cache.ehtp =
+ (_Unwind_EHT_Header *) selfrel_offset31 (&eitp->content, pid);
+ ucbp->pr_cache.additional = 0;
+ }
+
+ /* Discover the personality routine address. */
+ if (get_remote_word(pid, ucbp->pr_cache.ehtp) & (1u << 31))
+ {
+ /* One of the predefined standard routines. */
+ _uw idx = (get_remote_word(pid, ucbp->pr_cache.ehtp) >> 24) & 0xf;
+ if (idx == 0)
+ UCB_PR_ADDR (ucbp) = (_uw) &unwind_cpp_pr0_with_ptrace;
+ else if (idx == 1)
+ UCB_PR_ADDR (ucbp) = (_uw) &unwind_cpp_pr1_with_ptrace;
+ else if (idx == 2)
+ UCB_PR_ADDR (ucbp) = (_uw) &unwind_cpp_pr2_with_ptrace;
+ else
+ { /* Failed */
+ UCB_PR_ADDR (ucbp) = 0;
+ return _URC_FAILURE;
+ }
+ }
+ else
+ {
+ /* Execute region offset to PR */
+ UCB_PR_ADDR (ucbp) = selfrel_offset31 (ucbp->pr_cache.ehtp, pid);
+ /* Since we are unwinding the stack from a different process, it is
+ * impossible to execute the personality routine in debuggerd. Punt here.
+ */
+ return _URC_FAILURE;
+ }
+ return _URC_OK;
+}
+
+/* Print out the current call level, pc, and module name in the crash log */
+static _Unwind_Reason_Code log_function(_Unwind_Context *context, pid_t pid,
+ int tfd,
+ int stack_level,
+ mapinfo *map,
+ unsigned int sp_list[],
+ bool at_fault)
+{
+ _uw pc;
+ _uw rel_pc;
+ phase2_vrs *vrs = (phase2_vrs*) context;
+ const mapinfo *mi;
+ bool only_in_tombstone = !at_fault;
+
+ if (stack_level < STACK_CONTENT_DEPTH) {
+ sp_list[stack_level] = vrs->core.r[R_SP];
+ }
+ pc = vrs->core.r[R_PC];
+
+ // Top level frame
+ if (stack_level == 0) {
+ pc &= ~1;
+ }
+ // For deeper framers, rollback pc by one instruction
+ else {
+ pc = vrs->core.r[R_PC];
+ /* Thumb mode - need to check whether the bl(x) has long offset or not.
+ * Examples:
+ *
+ * arm blx in the middle of thumb:
+ * 187ae: 2300 movs r3, #0
+ * 187b0: f7fe ee1c blx 173ec
+ * 187b4: 2c00 cmp r4, #0
+ *
+ * arm bl in the middle of thumb:
+ * 187d8: 1c20 adds r0, r4, #0
+ * 187da: f136 fd15 bl 14f208
+ * 187de: 2800 cmp r0, #0
+ *
+ * pure thumb:
+ * 18894: 189b adds r3, r3, r2
+ * 18896: 4798 blx r3
+ * 18898: b001 add sp, #4
+ */
+ if (pc & 1) {
+ _uw prev_word;
+ pc = (pc & ~1);
+ prev_word = get_remote_word(pid, (void *) pc-4);
+ // Long offset
+ if ((prev_word & 0xf0000000) == 0xf0000000 &&
+ (prev_word & 0x0000e000) == 0x0000e000) {
+ pc -= 4;
+ }
+ else {
+ pc -= 2;
+ }
+ }
+ else {
+ pc -= 4;
+ }
+ }
+
+ /* We used to print the absolute PC in the back trace, and mask out the top
+ * 3 bits to guesstimate the offset in the .so file. This is not working for
+ * non-prelinked libraries since the starting offset may not be aligned on
+ * 1MB boundaries, and the library may be larger than 1MB. So for .so
+ * addresses we print the relative offset in back trace.
+ */
+ rel_pc = pc;
+ mi = pc_to_mapinfo(map, pc, &rel_pc);
+
+ _LOG(tfd, only_in_tombstone,
+ " #%02d pc %08x %s\n", stack_level, rel_pc,
+ mi ? mi->name : "");
+
+ return _URC_NO_REASON;
+}
+
+/* Derived from __gnu_Unwind_Backtrace to use ptrace */
+/* Perform stack backtrace through unwind data. Return the level of stack it
+ * unwinds.
+ */
+int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
+ unsigned int sp_list[], int *frame0_pc_sane,
+ bool at_fault)
+{
+ phase1_vrs saved_vrs;
+ _Unwind_Reason_Code code = _URC_OK;
+ struct pt_regs r;
+ int i;
+ int stack_level = 0;
+
+ _Unwind_Control_Block ucb;
+ _Unwind_Control_Block *ucbp = &ucb;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return 0;
+
+ for (i = 0; i < 16; i++) {
+ saved_vrs.core.r[i] = r.uregs[i];
+ /*
+ _LOG(tfd, "r[%d] = 0x%x\n", i, saved_vrs.core.r[i]);
+ */
+ }
+
+ /* Set demand-save flags. */
+ saved_vrs.demand_save_flags = ~(_uw) 0;
+
+ /*
+ * If the app crashes because of calling the weeds, we cannot pass the PC
+ * to the usual unwinding code as the EXIDX mapping will fail.
+ * Instead, we simply print out the 0 as the top frame, and resume the
+ * unwinding process with the value stored in LR.
+ */
+ if (get_eitp(saved_vrs.core.r[R_PC], pid, map, NULL) == NULL) {
+ *frame0_pc_sane = 0;
+ log_function ((_Unwind_Context *) &saved_vrs, pid, tfd, stack_level,
+ map, sp_list, at_fault);
+ saved_vrs.core.r[R_PC] = saved_vrs.core.r[R_LR];
+ stack_level++;
+ }
+
+ do {
+ mapinfo *this_map = NULL;
+ /* Find the entry for this routine. */
+ if (get_eit_entry(ucbp, saved_vrs.core.r[R_PC], pid, map, &this_map)
+ != _URC_OK) {
+ /* Uncomment the code below to study why the unwinder failed */
+#if 0
+ /* Shed more debugging info for stack unwinder improvement */
+ if (this_map) {
+ _LOG(tfd, 1,
+ "Relative PC=%#x from %s not contained in EXIDX\n",
+ saved_vrs.core.r[R_PC] - this_map->start, this_map->name);
+ }
+ _LOG(tfd, 1, "PC=%#x SP=%#x\n",
+ saved_vrs.core.r[R_PC], saved_vrs.core.r[R_SP]);
+#endif
+ code = _URC_FAILURE;
+ break;
+ }
+
+ /* The dwarf unwinder assumes the context structure holds things
+ like the function and LSDA pointers. The ARM implementation
+ caches these in the exception header (UCB). To avoid
+ rewriting everything we make the virtual IP register point at
+ the UCB. */
+ _Unwind_SetGR((_Unwind_Context *)&saved_vrs, 12, (_Unwind_Ptr) ucbp);
+
+ /* Call log function. */
+ if (log_function ((_Unwind_Context *) &saved_vrs, pid, tfd, stack_level,
+ map, sp_list, at_fault) != _URC_NO_REASON) {
+ code = _URC_FAILURE;
+ break;
+ }
+ stack_level++;
+
+ /* Call the pr to decide what to do. */
+ code = ((personality_routine_with_ptrace) UCB_PR_ADDR (ucbp))(
+ _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND, ucbp,
+ (void *) &saved_vrs, pid);
+ /*
+ * In theory the unwinding process will stop when the end of stack is
+ * reached or there is no unwinding information for the code address.
+ * To add another level of guarantee that the unwinding process
+ * will terminate we will stop it when the STACK_CONTENT_DEPTH is reached.
+ */
+ } while (code != _URC_END_OF_STACK && code != _URC_FAILURE &&
+ stack_level < STACK_CONTENT_DEPTH);
+ return stack_level;
+}
+
+
+/* Derived version to use ptrace */
+/* Common implementation for ARM ABI defined personality routines.
+ ID is the index of the personality routine, other arguments are as defined
+ by __aeabi_unwind_cpp_pr{0,1,2}. */
+
+static _Unwind_Reason_Code
+unwind_pr_common_with_ptrace (_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context,
+ int id,
+ pid_t pid)
+{
+ __gnu_unwind_state uws;
+ _uw *data;
+ int phase2_call_unexpected_after_unwind = 0;
+
+ state &= _US_ACTION_MASK;
+
+ data = (_uw *) ucbp->pr_cache.ehtp;
+ uws.data = get_remote_word(pid, data);
+ data++;
+ uws.next = data;
+ if (id == 0)
+ {
+ uws.data <<= 8;
+ uws.words_left = 0;
+ uws.bytes_left = 3;
+ }
+ else
+ {
+ uws.words_left = (uws.data >> 16) & 0xff;
+ uws.data <<= 16;
+ uws.bytes_left = 2;
+ data += uws.words_left;
+ }
+
+ /* Restore the saved pointer. */
+ if (state == _US_UNWIND_FRAME_RESUME)
+ data = (_uw *) ucbp->cleanup_cache.bitpattern[0];
+
+ if ((ucbp->pr_cache.additional & 1) == 0)
+ {
+ /* Process descriptors. */
+ while (get_remote_word(pid, data)) {
+ /**********************************************************************
+ * The original code here seems to deal with exceptions that are not
+ * applicable in our toolchain, thus there is no way to test it for now.
+ * Instead of leaving it here and causing potential instability in
+ * debuggerd, we'd better punt here and leave the stack unwound.
+ * In the future when we discover cases where the stack should be unwound
+ * further but is not, we can revisit the code here.
+ **********************************************************************/
+ return _URC_FAILURE;
+ }
+ /* Finished processing this descriptor. */
+ }
+
+ if (unwind_execute_with_ptrace (context, &uws, pid) != _URC_OK)
+ return _URC_FAILURE;
+
+ if (phase2_call_unexpected_after_unwind)
+ {
+ /* Enter __cxa_unexpected as if called from the call site. */
+ _Unwind_SetGR (context, R_LR, _Unwind_GetGR (context, R_PC));
+ _Unwind_SetGR (context, R_PC, (_uw) &__cxa_call_unexpected);
+ return _URC_INSTALL_CONTEXT;
+ }
+
+ return _URC_CONTINUE_UNWIND;
+}
+
+
+/* ABI defined personality routine entry points. */
+
+static _Unwind_Reason_Code
+unwind_cpp_pr0_with_ptrace (_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context,
+ pid_t pid)
+{
+ return unwind_pr_common_with_ptrace (state, ucbp, context, 0, pid);
+}
+
+static _Unwind_Reason_Code
+unwind_cpp_pr1_with_ptrace (_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context,
+ pid_t pid)
+{
+ return unwind_pr_common_with_ptrace (state, ucbp, context, 1, pid);
+}
+
+static _Unwind_Reason_Code
+unwind_cpp_pr2_with_ptrace (_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context,
+ pid_t pid)
+{
+ return unwind_pr_common_with_ptrace (state, ucbp, context, 2, pid);
+}
diff --git a/debuggerd/utility.c b/debuggerd/utility.c
new file mode 100644
index 0000000..8f3931c
--- /dev/null
+++ b/debuggerd/utility.c
@@ -0,0 +1,83 @@
+/* system/debuggerd/utility.c
+**
+** Copyright 2008, 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.
+*/
+
+#include <sys/ptrace.h>
+#include <sys/exec_elf.h>
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+
+#include "utility.h"
+
+/* Get a word from pid using ptrace. The result is the return value. */
+int get_remote_word(int pid, void *src)
+{
+ return ptrace(PTRACE_PEEKTEXT, pid, src, NULL);
+}
+
+
+/* Handy routine to read aggregated data from pid using ptrace. The read
+ * values are written to the dest locations directly.
+ */
+void get_remote_struct(int pid, void *src, void *dst, size_t size)
+{
+ unsigned int i;
+
+ for (i = 0; i+4 <= size; i+=4) {
+ *(int *)(dst+i) = ptrace(PTRACE_PEEKTEXT, pid, src+i, NULL);
+ }
+
+ if (i < size) {
+ int val;
+
+ assert((size - i) < 4);
+ val = ptrace(PTRACE_PEEKTEXT, pid, src+i, NULL);
+ while (i < size) {
+ ((unsigned char *)dst)[i] = val & 0xff;
+ i++;
+ val >>= 8;
+ }
+ }
+}
+
+/* Map a pc address to the name of the containing ELF file */
+const char *map_to_name(mapinfo *mi, unsigned pc, const char* def)
+{
+ while(mi) {
+ if((pc >= mi->start) && (pc < mi->end)){
+ return mi->name;
+ }
+ mi = mi->next;
+ }
+ return def;
+}
+
+/* Find the containing map info for the pc */
+const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc)
+{
+ while(mi) {
+ if((pc >= mi->start) && (pc < mi->end)){
+ // Only calculate the relative offset for shared libraries
+ if (strstr(mi->name, ".so")) {
+ *rel_pc = pc - mi->start;
+ }
+ return mi;
+ }
+ mi = mi->next;
+ }
+ return NULL;
+}
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
new file mode 100644
index 0000000..49f5951
--- /dev/null
+++ b/debuggerd/utility.h
@@ -0,0 +1,56 @@
+/* system/debuggerd/utility.h
+**
+** Copyright 2008, 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.
+*/
+
+#ifndef __utility_h
+#define __utility_h
+
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifndef PT_ARM_EXIDX
+#define PT_ARM_EXIDX 0x70000001 /* .ARM.exidx segment */
+#endif
+
+#define STACK_CONTENT_DEPTH 32
+
+typedef struct mapinfo {
+ struct mapinfo *next;
+ unsigned start;
+ unsigned end;
+ unsigned exidx_start;
+ unsigned exidx_end;
+ char name[];
+} mapinfo;
+
+/* Get a word from pid using ptrace. The result is the return value. */
+extern int get_remote_word(int pid, void *src);
+
+/* Handy routine to read aggregated data from pid using ptrace. The read
+ * values are written to the dest locations directly.
+ */
+extern void get_remote_struct(int pid, void *src, void *dst, size_t size);
+
+/* Find the containing map for the pc */
+const mapinfo *pc_to_mapinfo (mapinfo *mi, unsigned pc, unsigned *rel_pc);
+
+/* Map a pc address to the name of the containing ELF file */
+const char *map_to_name(mapinfo *mi, unsigned pc, const char* def);
+
+/* Log information onto the tombstone */
+extern void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...);
+
+#endif