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Support TLS variables on FreeBSD/powerpc. 

Derive the pointer to the DTV array from the %r2 register on 32-bit
powerpc and %r13 on 64-bit powerpc.

gdb/ChangeLog:

	* ppc-fbsd-tdep.c (ppcfbsd_get_thread_local_address): New.
	(ppcfbsd_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 b0f87ed032
commit 8399425f5f
2 changed files with 42 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>
* ppc-fbsd-tdep.c (ppcfbsd_get_thread_local_address): New.
(ppcfbsd_init_abi): Install gdbarch
"fetch_tls_load_module_address" and "get_thread_local_address"
methods.
2019-03-12 John Baldwin <jhb@FreeBSD.org>
* riscv-fbsd-tdep.c (riscv_fbsd_get_thread_local_address): New.

35
gdb/ppc-fbsd-tdep.c
View File

@ -279,6 +279,39 @@ ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
regcache, readbuf, writebuf);
}
/* Implement the "get_thread_local_address" gdbarch method. */
static CORE_ADDR
ppcfbsd_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;
int tp_offset, tp_regnum;
regcache = get_thread_arch_regcache (ptid, gdbarch);
if (tdep->wordsize == 4)
{
tp_offset = 0x7008;
tp_regnum = PPC_R0_REGNUM + 2;
}
else
{
tp_offset = 0x7010;
tp_regnum = PPC_R0_REGNUM + 13;
}
target_fetch_registers (regcache, tp_regnum);
ULONGEST tp;
if (regcache->cooked_read (tp_regnum, &tp) != REG_VALID)
error (_("Unable to fetch tcb pointer"));
/* tp points to the end of the TCB block. The first member of the
TCB is the pointer to the DTV array. */
CORE_ADDR dtv_addr = tp - tp_offset;
return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
}
static void
ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
@ -322,6 +355,8 @@ ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
set_gdbarch_get_thread_local_address (gdbarch,
ppcfbsd_get_thread_local_address);
}
void