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Diffstat (limited to 'glibc/debugging/ld_so_console.mdwn')
| -rw-r--r-- | glibc/debugging/ld_so_console.mdwn | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/glibc/debugging/ld_so_console.mdwn b/glibc/debugging/ld_so_console.mdwn new file mode 100644 index 00000000..d36317b6 --- /dev/null +++ b/glibc/debugging/ld_so_console.mdwn @@ -0,0 +1,17 @@ +[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +If you need to debug something in the early `ld.so` startup, and can't refrain +from good old `printf` debugging, there is a caveat: the available API in +`ld.so` is rather limited. See the few functions is `dl-sysdep.c`. For +example, there's a private `__libc_write`, which you should be able to use for +writing to FD stderr -- but, at early `ld.so` startup, this isn't usable as +`_hurd_init_dtable` is still all zeros, etc. To get you started, here is a +simple [[dl-sysdep.c.patch]] to get access to the Mach console. |