Patchwork [v2,08/11] Support TLS variables on FreeBSD/amd64.

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Submitter John Baldwin
Date Feb. 9, 2019, 12:40 a.m.
Message ID <7ecfef37a6f874f093abb9c896a27e1213f461f8.1549672588.git.jhb@FreeBSD.org>
Download mbox | patch
Permalink /patch/31381/
State New
Headers show

Comments

John Baldwin - Feb. 9, 2019, 12:40 a.m.
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.
---
 gdb/ChangeLog         |  7 +++++++
 gdb/amd64-fbsd-tdep.c | 25 +++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

Patch

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 387d5c1aee..2ed15dc048 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@ 
+2019-02-08  John Baldwin  <jhb@FreeBSD.org>
+
+	* 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.
+
 2019-02-08  John Baldwin  <jhb@FreeBSD.org>
 
 	* fbsd-tdep.c (fbsd_pspace_data_handle): New variable.
diff --git a/gdb/amd64-fbsd-tdep.c b/gdb/amd64-fbsd-tdep.c
index 403e65022d..7e2e9edf21 100644
--- a/gdb/amd64-fbsd-tdep.c
+++ b/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