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commit f5424cfa7e9337a6cb02a1f83c9feea0995c5350
Author: John Baldwin <jhb@FreeBSD.org>
Date: Tue Mar 12 13:39:02 2019 -0700
Support TLS variables on FreeBSD/amd64.
Use the fs_base register to fetch the address of a thread's tcb and
calculate the address of the DTV array. This value is then passed to
fbsd_get_thread_local_address to compute the final variable address.
Note that fs_base is currently only available via the native target as
core dumps on FreeBSD do not store the value of fs_base.
gdb/ChangeLog:
* amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.
(amd64fbsd_init_abi): Install gdbarch
"fetch_tls_load_module_address" and "get_thread_local_address"
methods.
diff --git gdb/amd64-fbsd-tdep.c gdb/amd64-fbsd-tdep.c
index 403e65022d..7e2e9edf21 100644
--- gdb/amd64-fbsd-tdep.c
+++ gdb/amd64-fbsd-tdep.c
@@ -204,6 +204,26 @@ amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
&amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
}
+/* Implement the get_thread_local_address gdbarch method. */
+
+static CORE_ADDR
+amd64fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
+ CORE_ADDR lm_addr, CORE_ADDR offset)
+{
+ struct regcache *regcache;
+
+ regcache = get_thread_arch_regcache (ptid, gdbarch);
+
+ target_fetch_registers (regcache, AMD64_FSBASE_REGNUM);
+
+ ULONGEST fsbase;
+ if (regcache->cooked_read (AMD64_FSBASE_REGNUM, &fsbase) != REG_VALID)
+ error (_("Unable to fetch %%fsbase"));
+
+ CORE_ADDR dtv_addr = fsbase + gdbarch_ptr_bit (gdbarch) / 8;
+ return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
+}
+
static void
amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
@@ -241,6 +261,11 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
/* FreeBSD uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+ set_gdbarch_get_thread_local_address (gdbarch,
+ amd64fbsd_get_thread_local_address);
}
void
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