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There are some basic tests that can be run qith qemu. You can run all the tests with
$ make check
or selectively with:
$ make run-hello
Also, you can debug the existing tests, or a new one, by starting on one shell
$ make debug-hello
and on another shell you can attach with gdb, load the symbols of the
bootstrap module and break on its _start():
$ gdb gnumach
...
(gdb) target remote :1234
...
(gdb) b setup_main
Breakpoint 11 at 0xffffffff81019d60: file ../kern/startup.c, line 98.
(gdb) c
Continuing.
Breakpoint 11, setup_main () at ../kern/startup.c:98
98 cninit();
(gdb) add-symbol-file ../gnumach/build-64/module-task
Reading symbols from ../gnumach/build-64/module-task...
(gdb) b _start
Breakpoint 12 at 0x40324a: _start. (2 locations)
(gdb) c
Continuing.
Breakpoint 12, _start () at ../tests/testlib.c:96
96 {
(gdb)
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