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S390: Fix gdbserver support for TDB 

This makes gdbserver actually provide values for the TDB registers
when the inferior was stopped in a transaction.  The change in
linux-low.c is needed to suppress the warning for an unavailable TDB.

The test case 's390-tdbregs.exp' passes with this patch and fails
without.

gdb/gdbserver/ChangeLog:

	* linux-low.c (regsets_fetch_inferior_registers): Suppress the
	warning upon ENODATA from ptrace.
	* linux-s390-low.c (s390_store_tdb): New.
	(s390_regsets): Add regset for NT_S390_TDB.
This commit is contained in:
Andreas Arnez 2014-12-12 14:14:21 +01:00 committed by Andreas Krebbel
parent feea5f36a9
commit e5a9158d09
3 changed files with 30 additions and 0 deletions
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7
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,10 @@
2014-12-12 Andreas Arnez <arnez@linux.vnet.ibm.com>
* linux-low.c (regsets_fetch_inferior_registers): Suppress the
warning upon ENODATA from ptrace.
* linux-s390-low.c (s390_store_tdb): New.
(s390_regsets): Add regset for NT_S390_TDB.
2014-12-12 Andreas Arnez <arnez@linux.vnet.ibm.com>
* linux-low.c (regsets_store_inferior_registers): Skip regsets

6
gdb/gdbserver/linux-low.c
View File

@ -4256,6 +4256,12 @@ regsets_fetch_inferior_registers (struct regsets_info *regsets_info,
this process mode. */
disable_regset (regsets_info, regset);
}
else if (errno == ENODATA)
{
/* ENODATA may be returned if the regset is currently
not "active". This can happen in normal operation,
so suppress the warning in this case. */
}
else
{
char s[256];

17
gdb/gdbserver/linux-s390-low.c
View File

@ -310,6 +310,20 @@ s390_store_system_call (struct regcache *regcache, const void *buf)
supply_register_by_name (regcache, "system_call", buf);
}
static void
s390_store_tdb (struct regcache *regcache, const void *buf)
{
int tdb0 = find_regno (regcache->tdesc, "tdb0");
int tr0 = find_regno (regcache->tdesc, "tr0");
int i;
for (i = 0; i < 4; i++)
supply_register (regcache, tdb0 + i, (const char *) buf + 8 * i);
for (i = 0; i < 16; i++)
supply_register (regcache, tr0 + i, (const char *) buf + 8 * (16 + i));
}
static struct regset_info s390_regsets[] = {
{ 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
/* Last break address is read-only; no fill function. */
@ -317,6 +331,9 @@ static struct regset_info s390_regsets[] = {
NULL, s390_store_last_break },
{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
/* TDB is read-only. */
{ PTRACE_GETREGSET, -1, NT_S390_TDB, 0, EXTENDED_REGS,
NULL, s390_store_tdb },
{ 0, 0, 0, -1, -1, NULL, NULL }
};