1/* dspcrashd.c
2**
3** Copyright 2010, The Android Open Source Project
4**
5** Redistribution and use in source and binary forms, with or without
6** modification, are permitted provided that the following conditions are met:
7**     * Redistributions of source code must retain the above copyright
8**       notice, this list of conditions and the following disclaimer.
9**     * Redistributions in binary form must reproduce the above copyright
10**       notice, this list of conditions and the following disclaimer in the
11**       documentation and/or other materials provided with the distribution.
12**     * Neither the name of Google Inc. nor the names of its contributors may
13**       be used to endorse or promote products derived from this software
14**       without specific prior written permission.
15**
16** THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
17** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19** EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26*/
27
28#include <stdio.h>
29#include <stdlib.h>
30#include <unistd.h>
31#include <fcntl.h>
32#include <errno.h>
33#include <time.h>
34#include <sys/klog.h>
35
36#include <cutils/properties.h>
37
38#define KLOG_BUF_SHIFT	17	/* CONFIG_LOG_BUF_SHIFT from our kernel */
39#define KLOG_BUF_LEN	(1 << KLOG_BUF_SHIFT)
40
41char *props[] = {
42    "ro.product.name",
43    "ro.build.id",
44    "ro.build.date",
45    "ro.serialno",
46    "ro.baseband",
47    0,
48};
49
50char *dashes = "---- ---- ---- ---- ---- ---- ---- ---- ---- ----\n";
51
52void dump_dmesg(int fd)
53{
54    char buffer[KLOG_BUF_LEN + 1];
55    char *p = buffer;
56    ssize_t ret;
57    int n, op;
58
59    n = klogctl(KLOG_READ_ALL, buffer, KLOG_BUF_LEN);
60    if (n < 0)
61        return;
62    buffer[n] = '\0';
63
64    while((ret = write(fd, p, n))) {
65        if (ret < 0) {
66            if (errno == EINTR)
67                continue;
68            return;
69        }
70        p += ret;
71        n -= ret;
72    }
73
74    return 0;
75}
76
77void dump_info(int fd)
78{
79    char buf[4096];
80    char val[PROPERTY_VALUE_MAX];
81    char **p = props;
82
83    write(fd, dashes, strlen(dashes));
84    while (*p) {
85        property_get(*p,val,"");
86        sprintf(buf,"%s: %s\n", *p, val);
87        write(fd, buf, strlen(buf));
88        p++;
89    }
90    write(fd, dashes, strlen(dashes));
91    dump_dmesg(fd);
92    write(fd, dashes, strlen(dashes));
93}
94
95void dump_dsp_state(int dsp)
96{
97    int fd, r;
98    char name[128];
99    char buf[128*1024];
100
101    sprintf(name,"/sdcard/dsp.crash.%d.img", (int) time(0));
102
103    fd = open(name, O_CREAT | O_TRUNC | O_WRONLY, 0644);
104    if (fd < 0)
105        return;
106
107    for (;;) {
108        r = read(dsp, buf, sizeof(buf));
109        if (r == 0) break;
110        if (r < 0) {
111            if (errno == EINTR)
112                continue;
113            break;
114        }
115        write(fd, buf, r);
116    }
117
118    dump_info(fd);
119    close(fd);
120
121    fd = open("/dev/kmsg", O_WRONLY);
122    if (fd >= 0) {
123        sprintf(buf,"*** WROTE DSP RAMDUMP TO %s ***\n",name);
124        write(fd, buf, strlen(buf));
125        close(fd);
126    }
127}
128
129int main(int argc, char **argv)
130{
131    int fd;
132    fd = open("/dev/dsp_debug", O_RDWR);
133    if (fd < 0)
134        return -1;
135
136    write(fd, "wait-for-crash", 14);
137
138    dump_dsp_state(fd);
139
140    sync();
141    sync();
142    sync();
143
144    write(fd, "continue-crash", 14);
145
146    close(fd);
147
148    for (;;)
149        sleep(100);
150
151    return 0;
152}
153
154