util/selfmap: Use dev_t and ino_t in MapInfo

Use dev_t instead of a string, and ino_t instead of uint64_t.
The latter is likely to be identical on modern systems but is
more type-correct for usage.

Tested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/qemu/selfmap.h

@@ -20,10 +20,10 @@ typedef struct {
     bool is_exec;
     bool is_priv;
 
+    dev_t dev;
+    ino_t inode;
     uint64_t offset;
-    uint64_t inode;
     const char *path;
-    char dev[];
 } MapInfo;
 
 /**

linux-user/syscall.c

@@ -8160,13 +8160,15 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps)
             }
 
             count = dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr
-                            " %c%c%c%c %08" PRIx64 " %s %"PRId64,
+                            " %c%c%c%c %08" PRIx64 " %02x:%02x %"PRId64,
                             h2g(min), h2g(max - 1) + 1,
                             (flags & PAGE_READ) ? 'r' : '-',
                             (flags & PAGE_WRITE_ORG) ? 'w' : '-',
                             (flags & PAGE_EXEC) ? 'x' : '-',
                             e->is_priv ? 'p' : 's',
-                            (uint64_t) e->offset, e->dev, e->inode);
+                            (uint64_t)e->offset,
+                            major(e->dev), minor(e->dev),
+                            (uint64_t)e->inode);
             if (path) {
                 dprintf(fd, "%*s%s\n", 73 - count, "", path);
             } else {

util/selfmap.c

@@ -30,19 +30,21 @@ IntervalTreeRoot *read_self_maps(void)
 
         if (nfields > 4) {
             uint64_t start, end, offset, inode;
+            unsigned dev_maj, dev_min;
             int errors = 0;
             const char *p;
 
             errors |= qemu_strtou64(fields[0], &p, 16, &start);
             errors |= qemu_strtou64(p + 1, NULL, 16, &end);
             errors |= qemu_strtou64(fields[2], NULL, 16, &offset);
+            errors |= qemu_strtoui(fields[3], &p, 16, &dev_maj);
+            errors |= qemu_strtoui(p + 1, NULL, 16, &dev_min);
             errors |= qemu_strtou64(fields[4], NULL, 10, &inode);
 
             if (!errors) {
-                size_t dev_len, path_len;
+                size_t path_len;
                 MapInfo *e;
 
-                dev_len = strlen(fields[3]) + 1;
                 if (nfields == 6) {
                     p = fields[5];
                     p += strspn(p, " ");
@@ -52,21 +54,21 @@ IntervalTreeRoot *read_self_maps(void)
                     path_len = 0;
                 }
 
-                e = g_malloc0(sizeof(*e) + dev_len + path_len);
+                e = g_malloc0(sizeof(*e) + path_len);
 
                 e->itree.start = start;
                 e->itree.last = end - 1;
                 e->offset = offset;
+                e->dev = makedev(dev_maj, dev_min);
                 e->inode = inode;
 
                 e->is_read  = fields[1][0] == 'r';
                 e->is_write = fields[1][1] == 'w';
                 e->is_exec  = fields[1][2] == 'x';
                 e->is_priv  = fields[1][3] == 'p';
 
-                memcpy(e->dev, fields[3], dev_len);
                 if (path_len) {
-                    e->path = memcpy(e->dev + dev_len, p, path_len);
+                    e->path = memcpy(e + 1, p, path_len);
                 }
 
                 interval_tree_insert(&e->itree, root);