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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.
This commit is contained in:
John Baldwin 2019-03-12 13:39:02 -07:00
parent f5424cfa7e
commit ce25aa57a3
2 changed files with 36 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2019-03-12 John Baldwin <jhb@FreeBSD.org>
* 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.
2019-03-12 John Baldwin <jhb@FreeBSD.org>
* amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.

29
gdb/i386-fbsd-tdep.c
View File

@ -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