[Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[hw.claudio]

From: Claudio Fontana <claudio.fontana@huawei.com>

This is the latest iteration of the memory search patch,
including a trivial replacement for the memmem function for systems
which don't provide one (notably Windows).

It detects the presence of memmem in configure and sets CONFIG_MEMMEM,
providing a trivial implementation for the !CONFIG_MEMMEM case.

The new code is MIT licensed, following usage of other files in the same
directory dealing with replacement functions (osdep, oslib, getauxval etc),
and to maximize reusability.

I have tested this in both CONFIG_MEMMEM defined/undefined scenarios,
but more feedback and testing is welcome of course.

changes from v5:
dropped the import from gnulib and implemented a trivial replacement.

changes from v4:
made into a series of two patches.
Introduced a memmem replacement function (import from gnulib)
and detection code in configure.

changes from v3:
initialize pointer variable to NULL to finally get rid of spurious warning

changes from v2:
move code to try to address spurious warning

changes from v1:
make checkpatch happy by adding braces here and there.


Claudio Fontana (2):
  util: add memmem replacement function
  monitor: add memory search commands s, sp

 configure            |  15 ++++++
 hmp-commands.hx      |  28 +++++++++++
 include/qemu/osdep.h |   4 ++
 monitor.c            | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++
 util/Makefile.objs   |   1 +
 util/memmem.c        |  62 +++++++++++++++++++++++
 6 files changed, 250 insertions(+)
 create mode 100644 util/memmem.c

-- 
1.8.5.3

[Qemu-devel] [RFC v6 1/2] util: add memmem replacement function

[hw.claudio]

From: Claudio Fontana <claudio.fontana@huawei.com>

if the memmem function is missing, provide a trivial replacement.

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
---
 configure            | 15 +++++++++++++
 include/qemu/osdep.h |  4 ++++
 util/Makefile.objs   |  1 +
 util/memmem.c        | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 util/memmem.c

diff --git a/configure b/configure
index 1f0f485..feb55b1 100755
--- a/configure
+++ b/configure
@@ -3078,6 +3078,17 @@ if compile_prog "" "" ; then
 fi
 
 ##########################################
+# memmem probe
+cat > $TMPC <<EOF
+#include <string.h>
+int main(int argc, char *argv[]) { return memmem(argv[0], 0, argv[0], 0) != argv[0]; }
+EOF
+memmem=no
+if compile_prog "" "" ; then
+  memmem=yes
+fi
+
+##########################################
 # fdt probe
 # fdt support is mandatory for at least some target architectures,
 # so insist on it if we're building those system emulators.
@@ -4431,6 +4442,7 @@ echo "RDMA support      $rdma"
 echo "TCG interpreter   $tcg_interpreter"
 echo "fdt support       $fdt"
 echo "preadv support    $preadv"
+echo "memmem support    $memmem"
 echo "fdatasync         $fdatasync"
 echo "madvise           $madvise"
 echo "posix_madvise     $posix_madvise"
@@ -4780,6 +4792,9 @@ fi
 if test "$preadv" = "yes" ; then
   echo "CONFIG_PREADV=y" >> $config_host_mak
 fi
+if test "$memmem" = "yes" ; then
+  echo "CONFIG_MEMMEM=y" >> $config_host_mak
+fi
 if test "$fdt" = "yes" ; then
   echo "CONFIG_FDT=y" >> $config_host_mak
 fi
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index b3300cc..d74ddff 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -201,6 +201,10 @@ ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
 #include <sys/uio.h>
 #endif
 
+#ifndef CONFIG_MEMMEM
+void *memmem(const void *hay, size_t hay_len, const void *s, size_t s_len);
+#endif /* !CONFIG_MEMMEM */
+
 #ifdef _WIN32
 static inline void qemu_timersub(const struct timeval *val1,
                                  const struct timeval *val2,
diff --git a/util/Makefile.objs b/util/Makefile.objs
index ceaba30..628242f 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -1,6 +1,7 @@
 util-obj-y = osdep.o cutils.o unicode.o qemu-timer-common.o
 util-obj-$(CONFIG_WIN32) += oslib-win32.o qemu-thread-win32.o event_notifier-win32.o
 util-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o event_notifier-posix.o qemu-openpty.o
+util-obj-$(call lnot,$(CONFIG_MEMMEM)) += memmem.o
 util-obj-y += envlist.o path.o module.o
 util-obj-$(call lnot,$(CONFIG_INT128)) += host-utils.o
 util-obj-y += bitmap.o bitops.o hbitmap.o
diff --git a/util/memmem.c b/util/memmem.c
new file mode 100644
index 0000000..32b58ba
--- /dev/null
+++ b/util/memmem.c
@@ -0,0 +1,62 @@
+/*
+ * memmem replacement function
+ *
+ * Copyright (C) 2015 Huawei Technologies Duesseldorf GmbH
+ * Written by Claudio Fontana <claudio.fontana@huawei.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <qemu-common.h>
+
+/*
+ * Search for the first occurrence of a binary string ("needle")
+ * in a memory region ("haystack").
+ *
+ * If needle length is 0, it returns the pointer to the haystack.
+ * Otherwise it returns the pointer to the first character of the first
+ * occurrence of the needle in the haystack, or NULL if none are found.
+ *
+ */
+void *memmem(const void *haystack, size_t hay_len, const void *needle, size_t s_len)
+{
+    const unsigned char *hay = (const unsigned char *)haystack;
+    const unsigned char *s = (const unsigned char *)needle;
+    const unsigned char *last = hay + (hay_len - s_len);
+
+    if (s_len == 0) {
+        return (void *)hay;
+    }
+
+    if (hay_len < s_len) {
+        return NULL;
+    }
+
+    if (s_len == 1) {
+        return memchr(hay, s[0], hay_len);
+    }
+
+    for (; hay <= last; hay++) {
+        if (hay[0] == s[0] && memcmp(hay, s, s_len) == 0) {
+            return (void *)hay;
+        }
+    }
+
+    return NULL;
+}
-- 
1.8.5.3

Re: [Qemu-devel] [RFC v6 1/2] util: add memmem replacement function

[Eric Blake]

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On 05/18/2015 05:22 AM, hw.claudio@gmail.com wrote:
> From: Claudio Fontana <claudio.fontana@huawei.com>
> 
> if the memmem function is missing, provide a trivial replacement.
> 
> Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
> ---
>  configure            | 15 +++++++++++++
>  include/qemu/osdep.h |  4 ++++
>  util/Makefile.objs   |  1 +
>  util/memmem.c        | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 82 insertions(+)
>  create mode 100644 util/memmem.c
> 

> +    if (s_len == 1) {
> +        return memchr(hay, s[0], hay_len);
> +    }
> +
> +    for (; hay <= last; hay++) {
> +        if (hay[0] == s[0] && memcmp(hay, s, s_len) == 0) {

An obvious optimization would be:

if (hay[0] == s[0] && memcmp(hay + 1, s + 1, s_len - 1) == 0)

since you already compared the first byte and know that the needle is
more than one byte.

But it's not worth the churn; this version is sufficient for the job as-is.

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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[Qemu-devel] [RFC v6 2/2] monitor: add memory search commands s, sp

[hw.claudio]

From: Claudio Fontana <claudio.fontana@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.fontana@huawei.com>
---
 hmp-commands.hx |  28 ++++++++++++
 monitor.c       | 140 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 168 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index e864a6c..badf1f5 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -430,6 +430,34 @@ 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 b2561e1..fde383e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1205,6 +1205,124 @@ 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 = NULL; /* needle to search in the haystack */
+    const char *format_str;    /* numeric input format string */
+    char value_raw[8];         /* numeric input converted to raw data */
+#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 */
+        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)
 {
@@ -1329,6 +1447,28 @@ 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

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Luiz Capitulino]

On Mon, 18 May 2015 13:22:16 +0200
hw.claudio@gmail.com wrote:

> From: Claudio Fontana <claudio.fontana@huawei.com>
> 
> This is the latest iteration of the memory search patch,
> including a trivial replacement for the memmem function for systems
> which don't provide one (notably Windows).
> 
> It detects the presence of memmem in configure and sets CONFIG_MEMMEM,
> providing a trivial implementation for the !CONFIG_MEMMEM case.
> 
> The new code is MIT licensed, following usage of other files in the same
> directory dealing with replacement functions (osdep, oslib, getauxval etc),
> and to maximize reusability.
> 
> I have tested this in both CONFIG_MEMMEM defined/undefined scenarios,
> but more feedback and testing is welcome of course.
> 
> changes from v5:
> dropped the import from gnulib and implemented a trivial replacement.
> 
> changes from v4:
> made into a series of two patches.
> Introduced a memmem replacement function (import from gnulib)
> and detection code in configure.
> 
> changes from v3:
> initialize pointer variable to NULL to finally get rid of spurious warning
> 
> changes from v2:
> move code to try to address spurious warning
> 
> changes from v1:
> make checkpatch happy by adding braces here and there.
> 
> 
> Claudio Fontana (2):
>   util: add memmem replacement function
>   monitor: add memory search commands s, sp

Applied to the qmp branch, thanks.

> 
>  configure            |  15 ++++++
>  hmp-commands.hx      |  28 +++++++++++
>  include/qemu/osdep.h |   4 ++
>  monitor.c            | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  util/Makefile.objs   |   1 +
>  util/memmem.c        |  62 +++++++++++++++++++++++
>  6 files changed, 250 insertions(+)
>  create mode 100644 util/memmem.c
> 

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Luiz Capitulino]

On Thu, 28 May 2015 16:18:41 -0400
Luiz Capitulino <lcapitulino@redhat.com> wrote:

> On Mon, 18 May 2015 13:22:16 +0200
> hw.claudio@gmail.com wrote:
> 
> > From: Claudio Fontana <claudio.fontana@huawei.com>
> > 
> > This is the latest iteration of the memory search patch,
> > including a trivial replacement for the memmem function for systems
> > which don't provide one (notably Windows).
> > 
> > It detects the presence of memmem in configure and sets CONFIG_MEMMEM,
> > providing a trivial implementation for the !CONFIG_MEMMEM case.
> > 
> > The new code is MIT licensed, following usage of other files in the same
> > directory dealing with replacement functions (osdep, oslib, getauxval etc),
> > and to maximize reusability.
> > 
> > I have tested this in both CONFIG_MEMMEM defined/undefined scenarios,
> > but more feedback and testing is welcome of course.
> > 
> > changes from v5:
> > dropped the import from gnulib and implemented a trivial replacement.
> > 
> > changes from v4:
> > made into a series of two patches.
> > Introduced a memmem replacement function (import from gnulib)
> > and detection code in configure.
> > 
> > changes from v3:
> > initialize pointer variable to NULL to finally get rid of spurious warning
> > 
> > changes from v2:
> > move code to try to address spurious warning
> > 
> > changes from v1:
> > make checkpatch happy by adding braces here and there.
> > 
> > 
> > Claudio Fontana (2):
> >   util: add memmem replacement function
> >   monitor: add memory search commands s, sp
> 
> Applied to the qmp branch, thanks.


Unfortunately, I'm quite busy and won't have time to push this
through my tree. Markus is going to pick up this series soon.

Acked-by: Luiz Capitulino <lcapitulino@redhat.com>

> 
> > 
> >  configure            |  15 ++++++
> >  hmp-commands.hx      |  28 +++++++++++
> >  include/qemu/osdep.h |   4 ++
> >  monitor.c            | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++
> >  util/Makefile.objs   |   1 +
> >  util/memmem.c        |  62 +++++++++++++++++++++++
> >  6 files changed, 250 insertions(+)
> >  create mode 100644 util/memmem.c
> > 
> 

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Markus Armbruster]

Luiz Capitulino <lcapitulino@redhat.com> writes:

> On Thu, 28 May 2015 16:18:41 -0400
> Luiz Capitulino <lcapitulino@redhat.com> wrote:
>
>> On Mon, 18 May 2015 13:22:16 +0200
>> hw.claudio@gmail.com wrote:
>> 
>> > From: Claudio Fontana <claudio.fontana@huawei.com>
>> > 
>> > This is the latest iteration of the memory search patch,
>> > including a trivial replacement for the memmem function for systems
>> > which don't provide one (notably Windows).
>> > 
>> > It detects the presence of memmem in configure and sets CONFIG_MEMMEM,
>> > providing a trivial implementation for the !CONFIG_MEMMEM case.
>> > 
>> > The new code is MIT licensed, following usage of other files in the same
>> > directory dealing with replacement functions (osdep, oslib, getauxval etc),
>> > and to maximize reusability.
>> > 
>> > I have tested this in both CONFIG_MEMMEM defined/undefined scenarios,
>> > but more feedback and testing is welcome of course.
>> > 
>> > changes from v5:
>> > dropped the import from gnulib and implemented a trivial replacement.
>> > 
>> > changes from v4:
>> > made into a series of two patches.
>> > Introduced a memmem replacement function (import from gnulib)
>> > and detection code in configure.
>> > 
>> > changes from v3:
>> > initialize pointer variable to NULL to finally get rid of spurious warning
>> > 
>> > changes from v2:
>> > move code to try to address spurious warning
>> > 
>> > changes from v1:
>> > make checkpatch happy by adding braces here and there.
>> > 
>> > 
>> > Claudio Fontana (2):
>> >   util: add memmem replacement function
>> >   monitor: add memory search commands s, sp
>> 
>> Applied to the qmp branch, thanks.
>
>
> Unfortunately, I'm quite busy and won't have time to push this
> through my tree. Markus is going to pick up this series soon.
>
> Acked-by: Luiz Capitulino <lcapitulino@redhat.com>

This series is marked RFC.  Is it intended for merging anyway?

Semantic conflict with
[PATCH v2 0/2] monitor+disas: Remove uses of ENV_GET_CPU
needs to be resolved:

  CC    x86_64-softmmu/monitor.o
/work/armbru/qemu/monitor.c: In function ‘memory_search’:
/work/armbru/qemu/monitor.c:1222:9: warning: passing argument 1 of ‘x86_env_get_cpu’ from incompatible pointer type [enabled by default]
         } else if (cpu_memory_rw_debug(ENV_GET_CPU(mon_get_cpu()), addr,
         ^
In file included from /work/armbru/qemu/target-i386/cpu.h:982:0,
                 from /work/armbru/qemu/include/qemu-common.h:124,
                 from /work/armbru/qemu/include/hw/hw.h:5,
                 from /work/armbru/qemu/monitor.c:25:
/work/armbru/qemu/target-i386/cpu-qom.h:119:23: note: expected ‘struct CPUX86State *’ but argument is of type ‘struct CPUState *’
 static inline X86CPU *x86_env_get_cpu(CPUX86State *env)
                       ^

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Claudio Fontana]

On 12.06.2015 08:21, Markus Armbruster wrote:
> Luiz Capitulino <lcapitulino@redhat.com> writes:
> 
>> On Thu, 28 May 2015 16:18:41 -0400
>> Luiz Capitulino <lcapitulino@redhat.com> wrote:
>>
>>> On Mon, 18 May 2015 13:22:16 +0200
>>> hw.claudio@gmail.com wrote:
>>>
>>>> From: Claudio Fontana <claudio.fontana@huawei.com>
>>>>
>>>> This is the latest iteration of the memory search patch,
>>>> including a trivial replacement for the memmem function for systems
>>>> which don't provide one (notably Windows).
>>>>
>>>> It detects the presence of memmem in configure and sets CONFIG_MEMMEM,
>>>> providing a trivial implementation for the !CONFIG_MEMMEM case.
>>>>
>>>> The new code is MIT licensed, following usage of other files in the same
>>>> directory dealing with replacement functions (osdep, oslib, getauxval etc),
>>>> and to maximize reusability.
>>>>
>>>> I have tested this in both CONFIG_MEMMEM defined/undefined scenarios,
>>>> but more feedback and testing is welcome of course.
>>>>
>>>> changes from v5:
>>>> dropped the import from gnulib and implemented a trivial replacement.
>>>>
>>>> changes from v4:
>>>> made into a series of two patches.
>>>> Introduced a memmem replacement function (import from gnulib)
>>>> and detection code in configure.
>>>>
>>>> changes from v3:
>>>> initialize pointer variable to NULL to finally get rid of spurious warning
>>>>
>>>> changes from v2:
>>>> move code to try to address spurious warning
>>>>
>>>> changes from v1:
>>>> make checkpatch happy by adding braces here and there.
>>>>
>>>>
>>>> Claudio Fontana (2):
>>>>   util: add memmem replacement function
>>>>   monitor: add memory search commands s, sp
>>>
>>> Applied to the qmp branch, thanks.
>>
>>
>> Unfortunately, I'm quite busy and won't have time to push this
>> through my tree. Markus is going to pick up this series soon.
>>
>> Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
> 
> This series is marked RFC.  Is it intended for merging anyway?
> 
> Semantic conflict with
> [PATCH v2 0/2] monitor+disas: Remove uses of ENV_GET_CPU
> needs to be resolved:

Hello Markus,

the two series conflict, but the resolution is quite simple.
I would suggest applying the "Remove uses of ENV_GET_CPU" stuff first, and then fixing up my patch, I can do it for you if you need.

Thanks!

Claudio


> 
>   CC    x86_64-softmmu/monitor.o
> /work/armbru/qemu/monitor.c: In function ‘memory_search’:
> /work/armbru/qemu/monitor.c:1222:9: warning: passing argument 1 of ‘x86_env_get_cpu’ from incompatible pointer type [enabled by default]
>          } else if (cpu_memory_rw_debug(ENV_GET_CPU(mon_get_cpu()), addr,
>          ^
> In file included from /work/armbru/qemu/target-i386/cpu.h:982:0,
>                  from /work/armbru/qemu/include/qemu-common.h:124,
>                  from /work/armbru/qemu/include/hw/hw.h:5,
>                  from /work/armbru/qemu/monitor.c:25:
> /work/armbru/qemu/target-i386/cpu-qom.h:119:23: note: expected ‘struct CPUX86State *’ but argument is of type ‘struct CPUState *’
>  static inline X86CPU *x86_env_get_cpu(CPUX86State *env)
>                        ^
> 


-- 
Claudio Fontana
Server Virtualization Architect
Huawei Technologies Duesseldorf GmbH
Riesstraße 25 - 80992 München

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Markus Armbruster]

Claudio Fontana <claudio.fontana@huawei.com> writes:

> On 12.06.2015 08:21, Markus Armbruster wrote:
>> This series is marked RFC.  Is it intended for merging anyway?
>> 
>> Semantic conflict with
>> [PATCH v2 0/2] monitor+disas: Remove uses of ENV_GET_CPU
>> needs to be resolved:
>
> Hello Markus,
>
> the two series conflict, but the resolution is quite simple.
> I would suggest applying the "Remove uses of ENV_GET_CPU" stuff first,
> and then fixing up my patch, I can do it for you if you need.

Please do, and make sure to drop the RFC on your respin if you want it
merged.

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Claudio Fontana]

Hello Markus,

the merge conflict resolution is the following:

-----

diff --git a/monitor.c b/monitor.c
index 4a5ac4e..fc6e15b 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1219,7 +1219,7 @@ static void memory_search(Monitor *mon, int
count, int format, int wsize,
         }
         if (is_physical) {
             cpu_physical_memory_read(addr, hay, l);
-        } else if (cpu_memory_rw_debug(ENV_GET_CPU(mon_get_cpu()), addr,
+        } else if (cpu_memory_rw_debug(mon_get_cpu(), addr,
                                        (uint8_t *)hay, l, 0) < 0) {
             monitor_printf(mon, " Cannot access memory\n");
             break;

-----

You can also fetch this from the following repo and branch:

https://github.com/hw-claudio/qemu-aarch64-queue "memsearch_merge_conflict"

Or do you want me to respin based on an uncommited state of master +
"remove ENV_GET_CPU" series?

Thanks,

Claudio


On 12 June 2015 at 14:57, Markus Armbruster <armbru@redhat.com> wrote:
> Claudio Fontana <claudio.fontana@huawei.com> writes:
>
>> On 12.06.2015 08:21, Markus Armbruster wrote:
>>> This series is marked RFC.  Is it intended for merging anyway?
>>>
>>> Semantic conflict with
>>> [PATCH v2 0/2] monitor+disas: Remove uses of ENV_GET_CPU
>>> needs to be resolved:
>>
>> Hello Markus,
>>
>> the two series conflict, but the resolution is quite simple.
>> I would suggest applying the "Remove uses of ENV_GET_CPU" stuff first,
>> and then fixing up my patch, I can do it for you if you need.
>
> Please do, and make sure to drop the RFC on your respin if you want it
> merged.

Re: [Qemu-devel] [RFC v6 0/2] monitor: add memory search commands s, sp

[Eric Blake]

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On 06/12/2015 07:31 AM, Claudio Fontana wrote:
> Hello Markus,
> 
> the merge conflict resolution is the following:
> 

> 
> Or do you want me to respin based on an uncommited state of master +
> "remove ENV_GET_CPU" series?

Probably easiest to just post a v7 with RFC dropped and all resolution
performed.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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