Date: Wed, 29 Sep 2010 17:58:40 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: PL <kadupl@wp.pl> Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: question regarding link_elf.c Message-ID: <4CA35420.1030108@icyb.net.ua> In-Reply-To: <4ca350c1278010.73850128@wp.pl> References: <4ca2f64ee66683.99262397@wp.pl> <4CA2FFAE.6030906@icyb.net.ua> <4ca3496d8ce8b3.74842248@wp.pl> <4CA34BCF.6090701@icyb.net.ua> <4ca350c1278010.73850128@wp.pl>
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on 29/09/2010 17:44 PL said the following: > Dnia 29-09-2010 o godz. 16:23 Andriy Gapon napisał(a): >> on 29/09/2010 17:13 PL said the following: >>> It seems like it is not a problem in my own code, since readelf -S on a >>> elf file >>> gives me the same results as my debug messages. I've created an empty >>> module, to >>> simplify debugging. Both my code, and readelf says, that '.text' section >>> address >>> is 0x3e0, and its size is 7 bytes. Adding 0x3e0 to lf->address points to >>> a valid location. >>> >>> '.data' is supposed to be at 0x1424 (again, both my code and readelf >>> returns the same thing), >>> but the actual data starts at lf->address + 0x3e7. How do I know ? I've >>> added global >>> initialized string variable in empty test module, and Im looking at the >>> memory to determine >>> it's location. I'm not sure what is wrong then. >> >> >> Can you post a link to the compiled test module? >> >> -- >> Andriy Gapon > > Well.. i don't have any public 'hosting', but I put it in here: > > http://www.4shared.com/dir/LHn_I393/sharing.html > > Also, the code is as simple as: > > 1 #include <sys/param.h> > 2 #include <sys/kernel.h> > 3 #include <sys/module.h> > 4 > 5 > 6 char *str = "THIS IS A STR MARKING DATA START"; You marker was put into .rodata section. Try char str[] instead. > 8 static int kms_null_handler(module_t m, int op, void *data) > 9 { > 10 return (0); > 11 } > 12 > 13 static moduledata_t kms_null_data = { > 14 "kms_null", > 15 kms_null_handler, > 16 NULL, > 17 }; > 18 > 19 DECLARE_MODULE(kms_null, kms_null_data, SI_SUB_EXEC, SI_ORDER_ANY); > > It is being compiled on i386/GENERIC kernel. > > -- Andriy Gapon
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