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malloc: Add malloc dump command to walk the heap

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Add a new 'malloc dump' command that walks the dlmalloc heap from start
to end, printing each chunk's address, size (in hex), and status
(used/free/top). This is useful for debugging memory allocation issues.

When CONFIG_MCHECK_HEAP_PROTECTION is enabled, the caller string is
also shown if available.

Example output:
    Heap dump: 18a1d000 - 1ea1f000
         Address        Size  Status
    ----------------------------------
        18a1d000          10  (chunk header)
        18a1d010          90  used
        18adfc30          60  <free>
        18adff90     5f3f030  top
        1ea1f000              end
    ----------------------------------
    Used: c2ef0 bytes in 931 chunks
    Free: 5f3f0c0 bytes in 2 chunks + top

Expand the console-record size to handle this command.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-02 10:56:34 +00:00
parent e2ccfa9c23
commit ee8e9bf104
6 changed files with 133 additions and 3 deletions
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14
cmd/malloc.c
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@@ -30,8 +30,18 @@ static int do_malloc_info(struct cmd_tbl *cmdtp, int flag, int argc,
return 0;
}
static int do_malloc_dump(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
malloc_dump();
return 0;
}
U_BOOT_LONGHELP(malloc,
"info - display malloc statistics\n");
"info - display malloc statistics\n"
"malloc dump - dump heap chunks (address, size, status)\n");
U_BOOT_CMD_WITH_SUBCMDS(malloc, "malloc information", malloc_help_text,
U_BOOT_SUBCMD_MKENT(info, 1, 1, do_malloc_info));
U_BOOT_SUBCMD_MKENT(info, 1, 1, do_malloc_info),
U_BOOT_SUBCMD_MKENT(dump, 1, 1, do_malloc_dump));