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From feea5f36a9dd65a0ff279c71744423c419b77ada 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 8/9] gdbserver: Support read-only regsets in linux-low.c
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For GNU/Linux targets using the regsets interface, this change
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supports regsets that can be read but not written. The S390 "last
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break" regset is an example. So far it had been defined with
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regset->set_request == PTRACE_GETREGSET, such that the respective
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ptrace call does not cause any harm. Now we just skip the whole
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read/modify/write sequence for regsets that do not define a
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fill_function.
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gdb/gdbserver/ChangeLog:
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* linux-low.c (regsets_store_inferior_registers): Skip regsets
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without a fill_function.
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* linux-s390-low.c (s390_fill_last_break): Remove.
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(s390_regsets): Set fill_function to NULL for NT_S390_LAST_BREAK.
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(s390_arch_setup): Use regset's size instead of fill_function for
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loop end condition.
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---
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gdb/gdbserver/ChangeLog | 9 +++++++++
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gdb/gdbserver/linux-low.c | 3 ++-
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gdb/gdbserver/linux-s390-low.c | 14 ++++----------
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3 files changed, 15 insertions(+), 11 deletions(-)
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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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@@ -4120,7 +4120,8 @@ regsets_store_inferior_registers (struct
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void *buf, *data;
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int nt_type, res;
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- if (regset->size == 0 || disabled_regsets[regset - target_regsets])
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+ if (regset->size == 0 || disabled_regsets[regset - target_regsets]
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+ || regset->fill_function == NULL)
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{
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regset ++;
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continue;
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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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@@ -264,12 +264,6 @@ static void s390_fill_gregset (struct re
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/* Fill and store functions for extended register sets. */
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static void
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-s390_fill_last_break (struct regcache *regcache, void *buf)
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-{
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- /* Last break address is read-only. */
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-}
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-
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-static void
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s390_store_last_break (struct regcache *regcache, const void *buf)
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{
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supply_register_by_name (regcache, "last_break",
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@@ -290,9 +284,9 @@ s390_store_system_call (struct regcache
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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; do not attempt PTRACE_SETREGSET. */
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- { PTRACE_GETREGSET, PTRACE_GETREGSET, NT_S390_LAST_BREAK, 0,
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- EXTENDED_REGS, s390_fill_last_break, s390_store_last_break },
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+ /* Last break address is read-only; no fill function. */
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+ { PTRACE_GETREGSET, -1, NT_S390_LAST_BREAK, 0, EXTENDED_REGS,
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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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{ 0, 0, 0, -1, -1, NULL, NULL }
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@@ -454,7 +448,7 @@ s390_arch_setup (void)
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}
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#endif
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/* Update target_regsets according to available register sets. */
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- for (regset = target_regsets; regset->fill_function != NULL; regset++)
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+ for (regset = target_regsets; regset->size >= 0; regset++)
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if (regset->get_request == PTRACE_GETREGSET)
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switch (regset->nt_type)
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{
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