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diff --git a/sys/compat/linuxkpi/common/include/linux/printk.h b/sys/compat/linuxkpi/common/include/linux/printk.h
--- a/sys/compat/linuxkpi/common/include/linux/printk.h
+++ b/sys/compat/linuxkpi/common/include/linux/printk.h
@@ -50,6 +50,12 @@
const char *, const char *, const int, const int, const int,
const void *, size_t, const bool, const bool);
+#define hex_dump_to_buffer(buf, len, rowsize, groupsize, linebuf, linebuflen, ascii) \
+ lkpi_hex_dump_to_buffer((buf), (len), (rowsize), (groupsize), (linebuf), (linebuflen), (ascii))
+
+int lkpi_hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
+ int groupsize, char *linebuf, size_t linebuflen, bool ascii);
+
static inline void
print_hex_dump(const char *level, const char *prefix_str,
const int prefix_type, const int rowsize, const int groupsize,
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -1986,6 +1986,76 @@
}
}
+struct hdtb_context {
+ char *linebuf;
+ size_t linebuflen;
+ int written;
+};
+
+static int
+hdtb_cb(void *arg, const char *format, ...)
+{
+ struct hdtb_context *context;
+ int written;
+ va_list args;
+
+ context = arg;
+
+ va_start(args, format);
+ written = vsnprintf(
+ context->linebuf, context->linebuflen, format, args);
+ va_end(args);
+
+ if (written < 0)
+ return (written);
+
+ /*
+ * Linux' hex_dump_to_buffer() function has the same behaviour as
+ * snprintf() basically. Therefore, it returns the number of bytes it
+ * would have written if the destination buffer was large enough.
+ *
+ * If the destination buffer was exhausted, lkpi_hex_dump() will
+ * continue to call this callback but it will only compute the bytes it
+ * would have written but write nothing to that buffer.
+ */
+ context->written += written;
+
+ if (written < context->linebuflen) {
+ context->linebuf += written;
+ context->linebuflen -= written;
+ } else {
+ context->linebuf += context->linebuflen;
+ context->linebuflen = 0;
+ }
+
+ return (written);
+}
+
+int
+lkpi_hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
+ int groupsize, char *linebuf, size_t linebuflen, bool ascii)
+{
+ int written;
+ struct hdtb_context context;
+
+ context.linebuf = linebuf;
+ context.linebuflen = linebuflen;
+ context.written = 0;
+
+ if (rowsize != 16 && rowsize != 32)
+ rowsize = 16;
+
+ len = min(len, rowsize);
+
+ lkpi_hex_dump(
+ hdtb_cb, &context, NULL, NULL, DUMP_PREFIX_NONE,
+ rowsize, groupsize, buf, len, ascii, false);
+
+ written = context.written;
+
+ return (written);
+}
+
static void
linux_timer_callback_wrapper(void *context)
{

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