util/hexdump: Remove b parameter from qemu_hexdump_line

Require that the caller output the offset and increment bufptr.
Use QEMU_HEXDUMP_LINE_BYTES in vhost_vdpa_dump_config instead
of raw integer.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240412073346.458116-2-richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

4 files changed, 10 insertions, 11 deletions

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 96632fd..3cf84e0 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -50,7 +50,7 @@ vhost_vdpa_get_device_id(void *dev, uint32_t device_id) "dev: %p device_id %"PRI
 vhost_vdpa_reset_device(void *dev) "dev: %p"
 vhost_vdpa_get_vq_index(void *dev, int idx, int vq_idx) "dev: %p idx: %d vq idx: %d"
 vhost_vdpa_set_vring_enable_one(void *dev, unsigned i, int enable, int r) "dev: %p, idx: %u, enable: %u, r: %d"
-vhost_vdpa_dump_config(void *dev, const char *line) "dev: %p %s"
+vhost_vdpa_dump_config(void *dev, unsigned ofs, const char *line) "dev: %p 0x%04x: %s"
 vhost_vdpa_set_config(void *dev, uint32_t offset, uint32_t size, uint32_t flags) "dev: %p offset: %"PRIu32" size: %"PRIu32" flags: 0x%"PRIx32
 vhost_vdpa_get_config(void *dev, void *config, uint32_t config_len) "dev: %p config: %p config_len: %"PRIu32
 vhost_vdpa_suspend(void *dev) "dev: %p"
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index ed99ab8..f3a86c1 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -949,8 +949,8 @@ static void vhost_vdpa_dump_config(struct vhost_dev *dev, const uint8_t *config,
 
     for (b = 0; b < config_len; b += 16) {
         len = config_len - b;
-        qemu_hexdump_line(line, b, config, len, false);
-        trace_vhost_vdpa_dump_config(dev, line);
+        qemu_hexdump_line(line, config + b, len, false);
+        trace_vhost_vdpa_dump_config(dev, b, line);
     }
 }
 
diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
index 741dade..d7715f7 100644
--- a/include/qemu/cutils.h
+++ b/include/qemu/cutils.h
@@ -287,7 +287,7 @@ int parse_debug_env(const char *name, int max, int initial);
  */
 #define QEMU_HEXDUMP_LINE_BYTES 16 /* Number of bytes to dump */
 #define QEMU_HEXDUMP_LINE_LEN 75   /* Number of characters in line */
-void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
+void qemu_hexdump_line(char *line, const void *bufptr,
                        unsigned int len, bool ascii);
 
 /*
diff --git a/util/hexdump.c b/util/hexdump.c
index 9921114..7324e7b 100644
--- a/util/hexdump.c
+++ b/util/hexdump.c
@@ -16,7 +16,7 @@
 #include "qemu/osdep.h"
 #include "qemu/cutils.h"
 
-void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
+void qemu_hexdump_line(char *line, const void *bufptr,
                        unsigned int len, bool ascii)
 {
     const char *buf = bufptr;
@@ -26,13 +26,12 @@ void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
         len = QEMU_HEXDUMP_LINE_BYTES;
     }
 
-    line += snprintf(line, 6, "%04x:", b);
     for (i = 0; i < QEMU_HEXDUMP_LINE_BYTES; i++) {
-        if ((i % 4) == 0) {
+        if (i != 0 && (i % 4) == 0) {
             *line++ = ' ';
         }
         if (i < len) {
-            line += sprintf(line, " %02x", (unsigned char)buf[b + i]);
+            line += sprintf(line, " %02x", (unsigned char)buf[i]);
         } else {
             line += sprintf(line, "   ");
         }
@@ -40,7 +39,7 @@ void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
     if (ascii) {
         *line++ = ' ';
         for (i = 0; i < len; i++) {
-            c = buf[b + i];
+            c = buf[i];
             if (c < ' ' || c > '~') {
                 c = '.';
             }
@@ -58,8 +57,8 @@ void qemu_hexdump(FILE *fp, const char *prefix,
 
     for (b = 0; b < size; b += QEMU_HEXDUMP_LINE_BYTES) {
         len = size - b;
-        qemu_hexdump_line(line, b, bufptr, len, true);
-        fprintf(fp, "%s: %s\n", prefix, line);
+        qemu_hexdump_line(line, bufptr + b, len, true);
+        fprintf(fp, "%s: %04x: %s\n", prefix, b, line);
     }
 
 }