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/coregrind/m_gdbserver/valgrind-low-mips32.c b/coregrind/m_gdbserver/valgrind-low-mips32.c
index 47adf4e..1490867 100644
--- a/coregrind/m_gdbserver/valgrind-low-mips32.c
+++ b/coregrind/m_gdbserver/valgrind-low-mips32.c
@@ -354,6 +354,16 @@
}
}
+static CORE_ADDR** target_get_dtv (ThreadState *tst)
+{
+#if defined(VGA_mips32)
+ // mips32 dtv location similar to ppc64
+ return (CORE_ADDR**)(tst->arch.vex.guest_ULR - 0x7000 - sizeof(CORE_ADDR));
+#else
+ vg_assert(0);
+#endif
+}
+
static struct valgrind_target_ops low_target = {
num_regs,
regs,
@@ -362,7 +372,8 @@
get_pc,
set_pc,
"mips",
- target_xml
+ target_xml,
+ target_get_dtv
};
void mips32_init_architecture (struct valgrind_target_ops *target)