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167 lines
7.5 KiB
Plaintext
167 lines
7.5 KiB
Plaintext
commit 6e056c817845f3d736a1be6b68c69b439c6c6d25
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Author: John Baldwin <jhb@FreeBSD.org>
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Date: Tue Mar 12 13:39:02 2019 -0700
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Add a new gdbarch method to resolve the address of TLS variables.
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Permit TLS variable addresses to be resolved purely by an ABI rather
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than requiring a target method. This doesn't try the target method if
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the ABI function is present (even if the ABI function fails) to
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simplify error handling.
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gdb/ChangeLog:
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* gdbarch.sh (get_thread_local_address): New method.
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* gdbarch.h, gdbarch.c: Regenerate.
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* target.c (target_translate_tls_address): Use
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gdbarch_get_thread_local_address if present instead of
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target::get_thread_local_address.
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diff --git gdb/gdbarch.c gdb/gdbarch.c
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index 434ee3bfcf..2b3fcef004 100644
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--- gdb/gdbarch.c
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+++ gdb/gdbarch.c
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@@ -251,6 +251,7 @@ struct gdbarch
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CORE_ADDR deprecated_function_start_offset;
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gdbarch_remote_register_number_ftype *remote_register_number;
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gdbarch_fetch_tls_load_module_address_ftype *fetch_tls_load_module_address;
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+ gdbarch_get_thread_local_address_ftype *get_thread_local_address;
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CORE_ADDR frame_args_skip;
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gdbarch_unwind_pc_ftype *unwind_pc;
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gdbarch_unwind_sp_ftype *unwind_sp;
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@@ -613,6 +614,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
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/* Skip verify of deprecated_function_start_offset, invalid_p == 0 */
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/* Skip verify of remote_register_number, invalid_p == 0 */
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/* Skip verify of fetch_tls_load_module_address, has predicate. */
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+ /* Skip verify of get_thread_local_address, has predicate. */
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/* Skip verify of frame_args_skip, invalid_p == 0 */
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/* Skip verify of unwind_pc, invalid_p == 0 */
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/* Skip verify of unwind_sp, invalid_p == 0 */
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@@ -1073,6 +1075,12 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
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fprintf_unfiltered (file,
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"gdbarch_dump: get_syscall_number = <%s>\n",
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host_address_to_string (gdbarch->get_syscall_number));
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+ fprintf_unfiltered (file,
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+ "gdbarch_dump: gdbarch_get_thread_local_address_p() = %d\n",
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+ gdbarch_get_thread_local_address_p (gdbarch));
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+ fprintf_unfiltered (file,
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+ "gdbarch_dump: get_thread_local_address = <%s>\n",
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+ host_address_to_string (gdbarch->get_thread_local_address));
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fprintf_unfiltered (file,
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"gdbarch_dump: gnu_triplet_regexp = <%s>\n",
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host_address_to_string (gdbarch->gnu_triplet_regexp));
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@@ -3018,6 +3026,30 @@ set_gdbarch_fetch_tls_load_module_address (struct gdbarch *gdbarch,
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gdbarch->fetch_tls_load_module_address = fetch_tls_load_module_address;
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}
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+int
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+gdbarch_get_thread_local_address_p (struct gdbarch *gdbarch)
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+{
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+ gdb_assert (gdbarch != NULL);
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+ return gdbarch->get_thread_local_address != NULL;
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+}
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+
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+CORE_ADDR
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+gdbarch_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid, CORE_ADDR lm_addr, CORE_ADDR offset)
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+{
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+ gdb_assert (gdbarch != NULL);
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+ gdb_assert (gdbarch->get_thread_local_address != NULL);
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+ if (gdbarch_debug >= 2)
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+ fprintf_unfiltered (gdb_stdlog, "gdbarch_get_thread_local_address called\n");
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+ return gdbarch->get_thread_local_address (gdbarch, ptid, lm_addr, offset);
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+}
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+
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+void
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+set_gdbarch_get_thread_local_address (struct gdbarch *gdbarch,
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+ gdbarch_get_thread_local_address_ftype get_thread_local_address)
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+{
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+ gdbarch->get_thread_local_address = get_thread_local_address;
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+}
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+
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CORE_ADDR
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gdbarch_frame_args_skip (struct gdbarch *gdbarch)
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{
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diff --git gdb/gdbarch.h gdb/gdbarch.h
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index 75618376ab..abb72e752b 100644
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--- gdb/gdbarch.h
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+++ gdb/gdbarch.h
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@@ -649,6 +649,18 @@ typedef CORE_ADDR (gdbarch_fetch_tls_load_module_address_ftype) (struct objfile
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extern CORE_ADDR gdbarch_fetch_tls_load_module_address (struct gdbarch *gdbarch, struct objfile *objfile);
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extern void set_gdbarch_fetch_tls_load_module_address (struct gdbarch *gdbarch, gdbarch_fetch_tls_load_module_address_ftype *fetch_tls_load_module_address);
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+/* Return the thread-local address at OFFSET in the thread-local
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+ storage for the thread PTID and the shared library or executable
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+ file given by LM_ADDR. If that block of thread-local storage hasn't
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+ been allocated yet, this function may throw an error. LM_ADDR may
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+ be zero for statically linked multithreaded inferiors. */
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+
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+extern int gdbarch_get_thread_local_address_p (struct gdbarch *gdbarch);
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+
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+typedef CORE_ADDR (gdbarch_get_thread_local_address_ftype) (struct gdbarch *gdbarch, ptid_t ptid, CORE_ADDR lm_addr, CORE_ADDR offset);
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+extern CORE_ADDR gdbarch_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid, CORE_ADDR lm_addr, CORE_ADDR offset);
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+extern void set_gdbarch_get_thread_local_address (struct gdbarch *gdbarch, gdbarch_get_thread_local_address_ftype *get_thread_local_address);
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+
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extern CORE_ADDR gdbarch_frame_args_skip (struct gdbarch *gdbarch);
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extern void set_gdbarch_frame_args_skip (struct gdbarch *gdbarch, CORE_ADDR frame_args_skip);
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diff --git gdb/gdbarch.sh gdb/gdbarch.sh
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index 48fcebd19a..63bfbad7d9 100755
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--- gdb/gdbarch.sh
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+++ gdb/gdbarch.sh
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@@ -602,6 +602,14 @@ m;int;remote_register_number;int regno;regno;;default_remote_register_number;;0
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# Fetch the target specific address used to represent a load module.
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F;CORE_ADDR;fetch_tls_load_module_address;struct objfile *objfile;objfile
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+
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+# Return the thread-local address at OFFSET in the thread-local
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+# storage for the thread PTID and the shared library or executable
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+# file given by LM_ADDR. If that block of thread-local storage hasn't
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+# been allocated yet, this function may throw an error. LM_ADDR may
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+# be zero for statically linked multithreaded inferiors.
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+
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+M;CORE_ADDR;get_thread_local_address;ptid_t ptid, CORE_ADDR lm_addr, CORE_ADDR offset;ptid, lm_addr, offset
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#
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v;CORE_ADDR;frame_args_skip;;;0;;;0
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m;CORE_ADDR;unwind_pc;struct frame_info *next_frame;next_frame;;default_unwind_pc;;0
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diff --git gdb/target.c gdb/target.c
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index 8579c19d05..c27157d209 100644
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--- gdb/target.c
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+++ gdb/target.c
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@@ -698,8 +698,9 @@ target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset)
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{
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volatile CORE_ADDR addr = 0;
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struct target_ops *target = current_top_target ();
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+ struct gdbarch *gdbarch = target_gdbarch ();
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- if (gdbarch_fetch_tls_load_module_address_p (target_gdbarch ()))
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+ if (gdbarch_fetch_tls_load_module_address_p (gdbarch))
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{
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ptid_t ptid = inferior_ptid;
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@@ -708,10 +709,14 @@ target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset)
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CORE_ADDR lm_addr;
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/* Fetch the load module address for this objfile. */
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- lm_addr = gdbarch_fetch_tls_load_module_address (target_gdbarch (),
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+ lm_addr = gdbarch_fetch_tls_load_module_address (gdbarch,
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objfile);
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- addr = target->get_thread_local_address (ptid, lm_addr, offset);
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+ if (gdbarch_get_thread_local_address_p (gdbarch))
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+ addr = gdbarch_get_thread_local_address (gdbarch, ptid, lm_addr,
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+ offset);
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+ else
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+ addr = target->get_thread_local_address (ptid, lm_addr, offset);
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}
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/* If an error occurred, print TLS related messages here. Otherwise,
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throw the error to some higher catcher. */
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@@ -766,8 +771,6 @@ target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset)
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}
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END_CATCH
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}
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- /* It wouldn't be wrong here to try a gdbarch method, too; finding
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- TLS is an ABI-specific thing. But we don't do that yet. */
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else
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error (_("Cannot find thread-local variables on this target"));
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