The branch stable/12 has been updated by kevans:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=9c81001f8d16cd80952f47a326bdf664180e3941

commit 9c81001f8d16cd80952f47a326bdf664180e3941
Author:     Toomas Soome <[email protected]>
AuthorDate: 2019-11-03 09:14:29 +0000
Commit:     Kyle Evans <[email protected]>
CommitDate: 2021-10-08 01:15:58 +0000

    loader: userboot/test should accept more than one disk
    
    allow to specify multiple -d options, test -d disk1 -d disk2 ..
    
    (cherry picked from commit bcbb1e60a1c181310a7ce36af2c202fa789d03e5)
---
 stand/userboot/test/test.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/stand/userboot/test/test.c b/stand/userboot/test/test.c
index f2fee82663d6..4dc67548c546 100644
--- a/stand/userboot/test/test.c
+++ b/stand/userboot/test/test.c
@@ -50,10 +50,11 @@ char *host_base = NULL;
 struct termios term, oldterm;
 char *image;
 size_t image_size;
-int disk_fd = -1;
 
 uint64_t regs[16];
 uint64_t pc;
+int *disk_fd;
+int disk_index = -1;
 
 void test_exit(void *arg, int v);
 
@@ -250,9 +251,9 @@ test_diskread(void *arg, int unit, uint64_t offset, void 
*dst, size_t size,
 {
        ssize_t n;
 
-       if (unit != 0 || disk_fd == -1)
+       if (unit > disk_index || disk_fd[unit] == -1)
                return (EIO);
-       n = pread(disk_fd, dst, size, offset);
+       n = pread(disk_fd[unit], dst, size, offset);
        if (n < 0)
                return (errno);
        *resid_return = size - n;
@@ -264,14 +265,14 @@ test_diskioctl(void *arg, int unit, u_long cmd, void 
*data)
 {
        struct stat sb;
 
-       if (unit != 0 || disk_fd == -1)
+       if (unit > disk_index || disk_fd[unit] == -1)
                return (EBADF);
        switch (cmd) {
        case DIOCGSECTORSIZE:
                *(u_int *)data = 512;
                break;
        case DIOCGMEDIASIZE:
-               if (fstat(disk_fd, &sb) == 0)
+               if (fstat(disk_fd[unit], &sb) == 0)
                        *(off_t *)data = sb.st_size;
                else
                        return (ENOTTY);
@@ -429,7 +430,6 @@ main(int argc, char** argv)
        void *h;
        void (*func)(struct loader_callbacks *, void *, int, int) __dead2;
        int opt;
-       char *disk_image = NULL;
        const char *userboot_obj = "/boot/userboot.so";
 
        while ((opt = getopt(argc, argv, "b:d:h:")) != -1) {
@@ -439,7 +439,12 @@ main(int argc, char** argv)
                        break;
 
                case 'd':
-                       disk_image = optarg;
+                       disk_index++;
+                       disk_fd = reallocarray(disk_fd, disk_index + 1,
+                           sizeof (int));
+                       disk_fd[disk_index] = open(optarg, O_RDONLY);
+                       if (disk_fd[disk_index] < 0)
+                               err(1, "Can't open disk image '%s'", optarg);
                        break;
 
                case 'h':
@@ -464,11 +469,6 @@ main(int argc, char** argv)
 
        image_size = 128*1024*1024;
        image = malloc(image_size);
-       if (disk_image) {
-               disk_fd = open(disk_image, O_RDONLY);
-               if (disk_fd < 0)
-                       err(1, "Can't open disk image '%s'", disk_image);
-       }
 
        tcgetattr(0, &term);
        oldterm = term;
@@ -476,5 +476,5 @@ main(int argc, char** argv)
        term.c_lflag &= ~(ICANON|ECHO);
        tcsetattr(0, TCSAFLUSH, &term);
 
-       func(&cb, NULL, USERBOOT_VERSION_3, disk_fd >= 0);
+       func(&cb, NULL, USERBOOT_VERSION_3, disk_index + 1);
 }

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