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Support TLS variables on FreeBSD/riscv.

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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.
This commit is contained in:
John Baldwin 2019-03-12 13:39:02 -07:00
parent ce25aa57a3
commit b0f87ed032
2 changed files with 34 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>
* 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.
2019-03-12 John Baldwin <jhb@FreeBSD.org>
* i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New.

27
gdb/riscv-fbsd-tdep.c
View File

@ -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