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authorThomas Schwinge <tschwinge@gnu.org>2008-11-20 22:16:01 +0100
committerThomas Schwinge <tschwinge@gnu.org>2008-11-20 22:16:01 +0100
commit56008b15e0bc425a5c7df28e88cfc808cc113f04 (patch)
tree7d63ee9aaa115655e8ecf45199d925beb402c121 /hurd/running/debian/porting
parent262b8f4401d882c3dfd8d0e5450ed5521a25cd02 (diff)
GCC: libmudflap.
Diffstat (limited to 'hurd/running/debian/porting')
-rw-r--r--hurd/running/debian/porting/gcc.mdwn2
-rw-r--r--hurd/running/debian/porting/gcc/libmudflap.mdwn72
2 files changed, 74 insertions, 0 deletions
diff --git a/hurd/running/debian/porting/gcc.mdwn b/hurd/running/debian/porting/gcc.mdwn
index ab540908..ec412b9c 100644
--- a/hurd/running/debian/porting/gcc.mdwn
+++ b/hurd/running/debian/porting/gcc.mdwn
@@ -40,3 +40,5 @@ Additionally:
* Also in other places: configure fragments that have `*linux*` cases
might/should often contain those for us (and GNU/k*BSD) as well.
+
+ * [[`libmudflap`|libmudflap]].
diff --git a/hurd/running/debian/porting/gcc/libmudflap.mdwn b/hurd/running/debian/porting/gcc/libmudflap.mdwn
new file mode 100644
index 00000000..2345828b
--- /dev/null
+++ b/hurd/running/debian/porting/gcc/libmudflap.mdwn
@@ -0,0 +1,72 @@
+[[meta copyright="Copyright © 2008 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]]."]]"""]]
+
+Single-threaded use appears to work:
+
+ $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩
+ gcc -o a -fmudflap -x c - -lmudflap
+ $ ./a
+ *******
+ mudflap violation 1 (check/write): time=1227208721.922064 ptr=0x1023de0 size=4
+ pc=0x1037a33 location=`<stdin>:1:26 (main)'
+ /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33]
+ ./a(main+0x7c) [0x80486c4]
+ /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239]
+ Nearby object 1: checked region begins 68B before and ends 65B before
+ mudflap object 0x80ca268: name=`argv[]'
+ bounds=[0x1023e24,0x1023e2b] size=8 area=static check=0r/0w liveness=0
+ alloc time=1227208721.922064 pc=0x10371d3
+ Nearby object 2: checked region begins 76B before and ends 73B before
+ mudflap object 0x80cb448: name=`environ[]'
+ bounds=[0x1023e2c,0x1023ed7] size=172 area=static check=0r/0w liveness=0
+ alloc time=1227208721.922064 pc=0x10371d3
+ number of nearby objects: 2
+ *******
+ mudflap violation 2 (check/read): time=1227208721.942109 ptr=0x1023dcc size=4
+ pc=0x1037a33 location=`<stdin>:1:35 (main)'
+ /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33]
+ ./a(main+0xf3) [0x804873b]
+ /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239]
+ Nearby object 1: checked region begins 88B before and ends 85B before
+ mudflap object 0x80ca268: name=`argv[]'
+ Nearby object 2: checked region begins 96B before and ends 93B before
+ mudflap object 0x80cb448: name=`environ[]'
+ number of nearby objects: 2
+
+Multi-threaded use doesn't:
+
+ $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩
+ gcc -include pthread.h -o a -fmudflapth -x c - -lmudflapth -lpthread
+ $ ./a
+ Killed
+ $ gdb a
+ [...]
+ Starting program: /media/data/home/tschwinge/a
+
+ Program received signal EXC_BAD_ACCESS, Could not access memory.
+ 0x01180653 in getenv () from /lib/libc.so.0.3
+ (gdb) bt
+ #0 0x01180653 in getenv () from /lib/libc.so.0.3
+ #1 0x01177a02 in __dcigettext () from /lib/libc.so.0.3
+ #2 0x01176a57 in dcgettext () from /lib/libc.so.0.3
+ #3 0x011c03b5 in strerror_r () from /lib/libc.so.0.3
+ #4 0x01175b57 in __assert_perror_fail () from /lib/libc.so.0.3
+ #5 0x0111f1ad in cthread_fork (func=0x114f630 <_hurd_msgport_receive>, arg=0x0)
+ at /build/buildd/hurd-20080607/build-tree/hurd/libpthread/pthread/cthreads-compat.c:41
+ #6 0x0115713e in _hurdsig_init () from /lib/libc.so.0.3
+ #7 0x01140852 in _hurd_proc_init@@GLIBC_2.2.6 () from /lib/libc.so.0.3
+ #8 0x01140e86 in _hurd_init () from /lib/libc.so.0.3
+ #9 0x011690ce in init1 () from /lib/libc.so.0.3
+ #10 0x00001e96 in _dl_start_user () from /lib/ld.so
+ #11 0x00000001 in ?? ()
+ #12 0x01024000 in ?? ()
+ #13 0x00000000 in ?? ()
+
+Also `libmudflap` is pthread-only.