fix 338160: Implement QGetTlsAddr query so that GDB+V gdbsrv can print __thread variables.
To implement QGetTlsAddr, gdbsrv has to know how to get the glibc dtv
address and the module id from the link_map.
These 2 things are dependent on the internals of glibc.
The dependency is mostly isolated in a few lines of arch dependent
code or in an external utility that used a hack + -ldl lib to find
the offset of the modid in the link_map structure.
Tested on x86/amd64/ppc64/s390x. Somewhat tested on ppc32 and arm64.
Untested/a few #ifdef-ed lines not compiled on arm/mips32/mips64
and darwin.
For more background info about thread local storage handling, see
'ELF Handling For Thread-Local Storage' http://www.akkadia.org/drepper/tls.pdf
Changes:
* auxprogs/getoff.c new auxilliary program to get platform specific offsets
(currently only the offset for the module id in struct link_map).
* configure.ac : check for dlinfo(RTLD_DI_TLS_MODID) needed for getoff.c
* new gdbserver_tests/hgtls, testing various types of __thread variables
* various m_gdbserver files:
- implement decoding of the QGetTlsAddr query
- for each platform: platform specific code to get the dtv
- call to external program getoff-<platform> the first time an
__thread variable is printed.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14283 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/gdbserver_tests/hgtls.stdinB.gdb b/gdbserver_tests/hgtls.stdinB.gdb
new file mode 100644
index 0000000..2541e9e
--- /dev/null
+++ b/gdbserver_tests/hgtls.stdinB.gdb
@@ -0,0 +1,37 @@
+# connect gdb to Valgrind gdbserver:
+target remote | ./vgdb --wait=60 --vgdb-prefix=./vgdb-prefix-hgtls
+echo vgdb launched process attached\n
+monitor v.set vgdb-error 999999
+#
+#
+# insert break:
+break tls.c:55
+command
+set $tls_ip = main
+if test == &tests[0]
+ set $tls_ip = &race
+end
+if test == &tests[1]
+ set $tls_ip = &local
+end
+if test == &tests[2]
+ set $tls_ip = &global
+end
+if test == &tests[3]
+ set $tls_ip = &static_extern
+end
+if test == &tests[4]
+ set $tls_ip = &so_extern
+end
+if test == &tests[5]
+ set $tls_ip = &so_local
+end
+if test == &tests[6]
+ set $tls_ip = &global
+end
+printf "test %s tls_ip %p ip %p equal %d\n", test->name, $tls_ip, ip, $tls_ip == ip
+continue
+end
+# continue till the end
+continue
+quit