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From e5a9158d093d53f2bb1057359ac381dcdf6d4305 Mon Sep 17 00:00:00 2001
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From: Andreas Arnez <arnez@linux.vnet.ibm.com>
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Date: Fri, 12 Dec 2014 14:14:21 +0100
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Subject: [PATCH 9/9] S390: Fix gdbserver support for TDB
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This makes gdbserver actually provide values for the TDB registers
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when the inferior was stopped in a transaction. The change in
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linux-low.c is needed to suppress the warning for an unavailable TDB.
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The test case 's390-tdbregs.exp' passes with this patch and fails
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without.
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gdb/gdbserver/ChangeLog:
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* linux-low.c (regsets_fetch_inferior_registers): Suppress the
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warning upon ENODATA from ptrace.
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* linux-s390-low.c (s390_store_tdb): New.
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(s390_regsets): Add regset for NT_S390_TDB.
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---
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gdb/gdbserver/ChangeLog | 7 +++++++
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gdb/gdbserver/linux-low.c | 6 ++++++
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gdb/gdbserver/linux-s390-low.c | 17 +++++++++++++++++
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3 files changed, 30 insertions(+)
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Index: gdb-7.6.1/gdb/gdbserver/linux-low.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/gdbserver/linux-low.c
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+++ gdb-7.6.1/gdb/gdbserver/linux-low.c
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@@ -4183,6 +4183,12 @@ regsets_store_inferior_registers (struct
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free (buf);
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return 0;
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}
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+ else if (errno == ENODATA)
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+ {
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+ /* ENODATA may be returned if the regset is currently
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+ not "active". This can happen in normal operation,
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+ so suppress the warning in this case. */
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+ }
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else
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{
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perror ("Warning: ptrace(regsets_store_inferior_registers)");
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Index: gdb-7.6.1/gdb/gdbserver/linux-s390-low.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/gdbserver/linux-s390-low.c
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+++ gdb-7.6.1/gdb/gdbserver/linux-s390-low.c
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@@ -282,6 +282,20 @@ s390_store_system_call (struct regcache
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supply_register_by_name (regcache, "system_call", buf);
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}
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+static void
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+s390_store_tdb (struct regcache *regcache, const void *buf)
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+{
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+ int tdb0 = find_regno ("tdb0");
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+ int tr0 = find_regno ("tr0");
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+ int i;
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+
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+ for (i = 0; i < 4; i++)
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+ supply_register (regcache, tdb0 + i, (const char *) buf + 8 * i);
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+
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+ for (i = 0; i < 16; i++)
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+ supply_register (regcache, tr0 + i, (const char *) buf + 8 * (16 + i));
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+}
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+
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struct regset_info target_regsets[] = {
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{ 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
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/* Last break address is read-only; no fill function. */
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@@ -289,6 +303,9 @@ struct regset_info target_regsets[] = {
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NULL, s390_store_last_break },
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
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EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
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+ /* TDB is read-only. */
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+ { PTRACE_GETREGSET, -1, NT_S390_TDB, 0, EXTENDED_REGS,
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+ NULL, s390_store_tdb },
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{ 0, 0, 0, -1, -1, NULL, NULL }
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};
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