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commit ce25aa57a3cdd028be5868423e6e55506ccd1053
Author: John Baldwin <jhb@FreeBSD.org>
Date: Tue Mar 12 13:39:02 2019 -0700
Support TLS variables on FreeBSD/i386.
Derive the pointer to the DTV array from the gs_base register. As
with FreeBSD/amd64, gs_base is currently only available via the native
target.
gdb/ChangeLog:
* i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New.
(i386fbsd_init_abi): Install gdbarch
"fetch_tls_load_module_address" and "get_thread_local_address"
methods.
diff --git gdb/i386-fbsd-tdep.c gdb/i386-fbsd-tdep.c
index ac57e7383d..f274847174 100644
--- gdb/i386-fbsd-tdep.c
+++ gdb/i386-fbsd-tdep.c
@@ -320,6 +320,30 @@ i386fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
"XSAVE extended state", cb_data);
}
+/* Implement the get_thread_local_address gdbarch method. */
+
+static CORE_ADDR
+i386fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
+ CORE_ADDR lm_addr, CORE_ADDR offset)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ struct regcache *regcache;
+
+ if (tdep->fsbase_regnum == -1)
+ error (_("Unable to fetch %%gsbase"));
+
+ regcache = get_thread_arch_regcache (ptid, gdbarch);
+
+ target_fetch_registers (regcache, tdep->fsbase_regnum + 1);
+
+ ULONGEST gsbase;
+ if (regcache->cooked_read (tdep->fsbase_regnum + 1, &gsbase) != REG_VALID)
+ error (_("Unable to fetch %%gsbase"));
+
+ CORE_ADDR dtv_addr = gsbase + gdbarch_ptr_bit (gdbarch) / 8;
+ return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
+}
+
static void
i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
@@ -418,6 +442,11 @@ i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_core_read_description (gdbarch,
i386fbsd_core_read_description);
+
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+ set_gdbarch_get_thread_local_address (gdbarch,
+ i386fbsd_get_thread_local_address);
}
void
|
