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* [binutils-gdb] Support TLS variables on FreeBSD/Aarch64.
@ 2022-05-03 23:10 John Baldwin
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From: John Baldwin @ 2022-05-03 23:10 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f9fbb7636a5b67abae41a35f02ae70f58523d375
commit f9fbb7636a5b67abae41a35f02ae70f58523d375
Author: John Baldwin <jhb@FreeBSD.org>
Date: Tue May 3 16:05:10 2022 -0700
Support TLS variables on FreeBSD/Aarch64.
Derive the pointer to the DTV array from the tpidr register.
Diff:
---
gdb/aarch64-fbsd-tdep.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/gdb/aarch64-fbsd-tdep.c b/gdb/aarch64-fbsd-tdep.c
index ed1b84387f0..fdf0795b9bf 100644
--- a/gdb/aarch64-fbsd-tdep.c
+++ b/gdb/aarch64-fbsd-tdep.c
@@ -23,6 +23,7 @@
#include "fbsd-tdep.h"
#include "aarch64-tdep.h"
#include "aarch64-fbsd-tdep.h"
+#include "inferior.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "target.h"
@@ -180,6 +181,30 @@ aarch64_fbsd_core_read_description (struct gdbarch *gdbarch,
return aarch64_read_description (0, false, false, tls != nullptr);
}
+/* Implement the get_thread_local_address gdbarch method. */
+
+static CORE_ADDR
+aarch64_fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
+ CORE_ADDR lm_addr, CORE_ADDR offset)
+{
+ aarch64_gdbarch_tdep *tdep = (aarch64_gdbarch_tdep *) gdbarch_tdep (gdbarch);
+ struct regcache *regcache;
+
+ regcache = get_thread_arch_regcache (current_inferior ()->process_target (),
+ ptid, gdbarch);
+
+ target_fetch_registers (regcache, tdep->tls_regnum);
+
+ ULONGEST tpidr;
+ if (regcache->cooked_read (tdep->tls_regnum, &tpidr) != REG_VALID)
+ error (_("Unable to fetch %%tpidr"));
+
+ /* %tpidr points to the TCB whose first member is the dtv
+ pointer. */
+ CORE_ADDR dtv_addr = tpidr;
+ return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
+}
+
/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
static void
@@ -202,6 +227,14 @@ aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
(gdbarch, aarch64_fbsd_iterate_over_regset_sections);
set_gdbarch_core_read_description (gdbarch,
aarch64_fbsd_core_read_description);
+
+ if (tdep->has_tls ())
+ {
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+ set_gdbarch_get_thread_local_address
+ (gdbarch, aarch64_fbsd_get_thread_local_address);
+ }
}
void _initialize_aarch64_fbsd_tdep ();
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