From: Claudio Fontana <claudio.font...@huawei.com>
usage is similar to the commands x, xp.
Example with string: looking for "ELF" header in memory:
(qemu) s/1000000cb 0x40001000 "ELF"
searching memory area [0000000040001000-00000000400f5240]
0000000040090001
(qemu) x/20b 0x40090000
0000000040090000: '\x7f' 'E' 'L' 'F' '\x02' '\x01' '\x01' '\x03'
0000000040090008: '\x00' '\x00' '\x00' '\x00' '\x00' '\x00' '\x00' '\x00'
0000000040090010: '\x02' '\x00' '\xb7' '\x00'
Example with value: looking for 64bit variable value 0x990088
(qemu) s/1000000xg 0xffff900042000000 0x990088
searching memory area [ffff900042000000-ffff9000427a1200]
ffff9000424b3000
ffff9000424c1000
Signed-off-by: Claudio Fontana <claudio.font...@huawei.com>
---
hmp-commands.hx | 28 +++++++++++
monitor.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 169 insertions(+)
changes from v1:
make checkpatch happy by adding braces here and there.
diff --git a/hmp-commands.hx b/hmp-commands.hx
index d5022d8..2bf5737 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -432,6 +432,34 @@ Start gdbserver session (default @var{port}=1234)
ETEXI
{
+ .name = "s",
+ .args_type = "fmt:/,addr:l,data:s",
+ .params = "/fmt addr data",
+ .help = "search virtual memory starting at 'addr' for 'data'",
+ .mhandler.cmd = hmp_memory_search,
+ },
+
+STEXI
+@item s/fmt @var{addr} @var{data}
+@findex s
+Virtual memory search starting at @var{addr} for data described by @var{data}.
+ETEXI
+
+ {
+ .name = "sp",
+ .args_type = "fmt:/,addr:l,data:s",
+ .params = "/fmt addr data",
+ .help = "search physical memory starting at 'addr' for 'data'",
+ .mhandler.cmd = hmp_physical_memory_search,
+ },
+
+STEXI
+@item sp/fmt @var{addr} @var{data}
+@findex sp
+Physical memory search starting at @var{addr} for data described by @var{data}.
+ETEXI
+
+ {
.name = "x",
.args_type = "fmt:/,addr:l",
.params = "/fmt addr",
diff --git a/monitor.c b/monitor.c
index c86a89e..f35d949 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1208,6 +1208,125 @@ static void monitor_printc(Monitor *mon, int c)
monitor_printf(mon, "'");
}
+static void monitor_print_addr(Monitor *mon, hwaddr addr, bool is_physical)
+{
+ if (is_physical) {
+ monitor_printf(mon, TARGET_FMT_plx "\n", addr);
+ } else {
+ monitor_printf(mon, TARGET_FMT_lx "\n", (target_ulong)addr);
+ }
+}
+
+/* simple memory search for a byte sequence. The sequence is generated from
+ * a numeric value to look for in guest memory, or from a string.
+ */
+static void memory_search(Monitor *mon, int count, int format, int wsize,
+ hwaddr addr, const char *data_str, bool is_physical)
+{
+ int pos, len; /* pos in the search area, len of area */
+ char *hay; /* buffer for haystack */
+ int hay_size; /* haystack size. Needle size is wsize. */
+ const char *needle; /* needle to search in the haystack */
+ const char *format_str; /* numeric input format string */
+
+#define MONITOR_S_CHUNK_SIZE 16000
+
+ len = wsize * count;
+ if (len < 1) {
+ monitor_printf(mon, "invalid search area length.\n");
+ return;
+ }
+ switch (format) {
+ case 'i':
+ monitor_printf(mon, "format '%c' not supported.\n", format);
+ return;
+ case 'c':
+ needle = data_str;
+ wsize = strlen(data_str);
+ if (wsize > MONITOR_S_CHUNK_SIZE) {
+ monitor_printf(mon, "search string too long [max %d].\n",
+ MONITOR_S_CHUNK_SIZE);
+ return;
+ }
+ break;
+ case 'o':
+ format_str = "%" SCNo64;
+ break;
+ default:
+ case 'x':
+ format_str = "%" SCNx64;
+ break;
+ case 'u':
+ format_str = "%" SCNu64;
+ break;
+ case 'd':
+ format_str = "%" SCNd64;
+ break;
+ }
+ if (format != 'c') {
+ uint64_t value; /* numeric input value */
+ char value_raw[8]; /* numeric input converted to raw data */
+ void *from = &value;
+ if (sscanf(data_str, format_str, &value) != 1) {
+ monitor_printf(mon, "could not parse search string "
+ "\"%s\" as format '%c'.\n", data_str, format);
+ return;
+ }
+#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
+ value = bswap64(value);
+#endif
+#if defined(TARGET_WORDS_BIGENDIAN)
+ from += 8 - wsize;
+#endif
+ memcpy(value_raw, from, wsize);
+ needle = value_raw;
+ }
+ monitor_printf(mon, "searching memory area ");
+ if (is_physical) {
+ monitor_printf(mon, "[" TARGET_FMT_plx "-" TARGET_FMT_plx "]\n",
+ addr, addr + len);
+ } else {
+ monitor_printf(mon, "[" TARGET_FMT_lx "-" TARGET_FMT_lx "]\n",
+ (target_ulong)addr, (target_ulong)addr + len);
+ }
+ hay_size = len < MONITOR_S_CHUNK_SIZE ? len : MONITOR_S_CHUNK_SIZE;
+ hay = g_malloc0(hay_size);
+
+ for (pos = 0; pos < len;) {
+ char *mark, *match; /* mark new starting position, eventual match */
+ int l, todo; /* total length to be processed in current chunk */
+ l = len - pos;
+ if (l > hay_size) {
+ l = hay_size;
+ }
+ if (is_physical) {
+ cpu_physical_memory_read(addr, hay, l);
+ } else if (cpu_memory_rw_debug(ENV_GET_CPU(mon_get_cpu()), addr,
+ (uint8_t *)hay, l, 0) < 0) {
+ monitor_printf(mon, " Cannot access memory\n");
+ break;
+ }
+ for (mark = hay, todo = l; todo >= wsize;) {
+ match = memmem(mark, todo, needle, wsize);
+ if (!match) {
+ break;
+ }
+ monitor_print_addr(mon, addr + (match - hay), is_physical);
+ mark = match + 1;
+ todo = mark - hay;
+ }
+ if (pos + l < len) {
+ /* catch potential matches across chunks. */
+ pos += l - (wsize - 1);
+ addr += l - (wsize - 1);
+ } else {
+ pos += l;
+ addr += l;
+ }
+ }
+ g_free(hay);
+}
+
static void memory_dump(Monitor *mon, int count, int format, int wsize,
hwaddr addr, int is_physical)
{
@@ -1332,6 +1451,28 @@ static void memory_dump(Monitor *mon, int count, int
format, int wsize,
}
}
+static void hmp_memory_search(Monitor *mon, const QDict *qdict)
+{
+ int count = qdict_get_int(qdict, "count");
+ int format = qdict_get_int(qdict, "format");
+ int size = qdict_get_int(qdict, "size");
+ target_long addr = qdict_get_int(qdict, "addr");
+ const char *data_str = qdict_get_str(qdict, "data");
+
+ memory_search(mon, count, format, size, addr, data_str, false);
+}
+
+static void hmp_physical_memory_search(Monitor *mon, const QDict *qdict)
+{
+ int count = qdict_get_int(qdict, "count");
+ int format = qdict_get_int(qdict, "format");
+ int size = qdict_get_int(qdict, "size");
+ hwaddr addr = qdict_get_int(qdict, "addr");
+ const char *data_str = qdict_get_str(qdict, "data");
+
+ memory_search(mon, count, format, size, addr, data_str, true);
+}
+
static void hmp_memory_dump(Monitor *mon, const QDict *qdict)
{
int count = qdict_get_int(qdict, "count");
--
1.8.5.3
