[v2,10/11] Support TLS variables on FreeBSD/riscv.
Commit Message
Derive the pointer to the DTV array from the tp register.
gdb/ChangeLog:
* riscv-fbsd-tdep.c (riscv_fbsd_get_thread_local_address): New.
(riscv_fbsd_init_abi): Install gdbarch
"fetch_tls_load_module_address" and "get_thread_local_address"
methods.
---
gdb/ChangeLog | 7 +++++++
gdb/riscv-fbsd-tdep.c | 27 +++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
@@ -1,3 +1,10 @@
+2019-02-08 John Baldwin <jhb@FreeBSD.org>
+
+ * riscv-fbsd-tdep.c (riscv_fbsd_get_thread_local_address): New.
+ (riscv_fbsd_init_abi): Install gdbarch
+ "fetch_tls_load_module_address" and "get_thread_local_address"
+ methods.
+
2019-02-08 John Baldwin <jhb@FreeBSD.org>
* i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New.
@@ -174,6 +174,28 @@ static const struct tramp_frame riscv_fbsd_sigframe =
riscv_fbsd_sigframe_init
};
+/* Implement the "get_thread_local_address" gdbarch method. */
+
+static CORE_ADDR
+riscv_fbsd_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, RISCV_TP_REGNUM);
+
+ ULONGEST tp;
+ if (regcache->cooked_read (RISCV_TP_REGNUM, &tp) != REG_VALID)
+ error (_("Unable to fetch %%tp"));
+
+ /* %tp points to the end of the TCB which contains two pointers.
+ The first pointer in the TCB points to the DTV array. */
+ CORE_ADDR dtv_addr = tp - (gdbarch_ptr_bit (gdbarch) / 8) * 2;
+ return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
+}
+
/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
static void
@@ -193,6 +215,11 @@ riscv_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_iterate_over_regset_sections
(gdbarch, riscv_fbsd_iterate_over_regset_sections);
+
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+ set_gdbarch_get_thread_local_address (gdbarch,
+ riscv_fbsd_get_thread_local_address);
}
void