159 lines
5.7 KiB
Diff
159 lines
5.7 KiB
Diff
for gdb-6.3/gdb/ChangeLog
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from Alexandre Oliva <aoliva@redhat.com>
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* i386-linux-nat.c (i386_debug_register_for_thread): New struct.
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(i386_linux_set_dr_for_thread): Rename from...
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(i386_linux_set_debug_regs_for_thread): ... this, and
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add new function to catch exceptions in the old one.
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2008-02-24 Jan Kratochvil <jan.kratochvil@redhat.com>
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Port to GDB-6.8pre.
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This patch was originally made to workaround a deficiency of ia32el (==ia32
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emulator on ia64) which EIOs on ptrace(2) of the debug registers.
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Currently I can no longer run gdb.i386 on RHEL-5.1.ia64 as it fails on
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$ rpm -qv kernel
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kernel-2.6.18-53.el5.ia64
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$ file /emul/ia32-linux/usr/bin/gdb ./print-threads
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/emul/ia32-linux/usr/bin/gdb: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
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./print-threads: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
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$ /emul/ia32-linux/usr/bin/gdb ./print-threads
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(gdb) r
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Starting program: /root/jkratoch/redhat/print-threads
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Warning:
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Cannot insert breakpoint -2.
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Error accessing memory address 0x555766fb: Input/output error.
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(gdb) maint info breakpoints
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Num Type Disp Enb Address What
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-1 longjmp resume keep n 0x00000000
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-2 shlib events keep y 0x555766fb
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ia32-on-ia64 run problem info:
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the inconsistency is in function linux_nat_wait - there is a variable called
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block_mask, which is assumed to represent the current signal mask. in the
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following execution path this assumption does not hold:
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1) block-mask is filled with SIGCHLD and the signal is masked in
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lin_lwp_attach_lwp, which is called at the beginning of the procedure
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that handles a new thread in the debuggee.
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2) further down this procedure gdb tries to set the debug regs of the debuggee.
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when trying to set debug regs - gdb fails and calls throw_exception. this
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function finishes with siglongjmp, which clears the sigmask (seq. 1).
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3) further down, linux_nat_wait is called to wait on the new child. in
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linux_nat_wait there is a sequence :
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if ( ! (block_mask & SIGCHLD) )
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mask- SIGCHLD
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while () {
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wait-no-hang( )
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if no child found then
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sigsuspend (SIGCHLD)
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4) the signal that notifies the debugger about the child is received after the
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wait and before the sigsuspend. originally, this was not supposed to happen
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because SIGCHLD is supposed to be blocked, but because what happens in step
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2, the signal mask is cleared and the signal is received at this point,
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which results with a hang
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sequence 1:
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catch_errors (symbol_add_stubs)
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symbol_file_add_with_addrs_or_offsets
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deprecated_target_new_objfile_hook
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tui_new_objfile_hook
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attach_thread
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observer_notify_linux_new_thread
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generic_observer_notify
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observer_linux_new_thread_notification_stub
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i386_linux_new_thread
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i386_linux_set_debug_regs_for_thread
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i386_linux_dr_set_addr
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i386_linux_dr_set
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perror_with_name
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.
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.
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.
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throw_exception
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siglongjmp
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RHEL Bug 175270
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Index: gdb-6.8cvs20080219/gdb/i386-linux-nat.c
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===================================================================
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--- gdb-6.8cvs20080219.orig/gdb/i386-linux-nat.c 2008-01-10 19:19:02.000000000 +0100
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+++ gdb-6.8cvs20080219/gdb/i386-linux-nat.c 2008-02-24 09:23:09.000000000 +0100
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@@ -24,6 +24,7 @@
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#include "regcache.h"
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#include "target.h"
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#include "linux-nat.h"
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+#include "exceptions.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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@@ -611,20 +612,40 @@ i386_linux_dr_get (ptid_t ptid, int regn
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return value;
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}
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-static void
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-i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
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-{
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- int tid;
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+struct i386_linux_dr_set
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+ {
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+ int tid;
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+ int regnum;
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+ unsigned long value;
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+ };
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- tid = TIDGET (ptid);
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- if (tid == 0)
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- tid = PIDGET (ptid);
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+static int
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+i386_linux_dr_set_core (void *data_pointer)
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+{
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+ struct i386_linux_dr_set *data = data_pointer;
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errno = 0;
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- ptrace (PTRACE_POKEUSER, tid,
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- offsetof (struct user, u_debugreg[regnum]), value);
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+ ptrace (PTRACE_POKEUSER, data->tid,
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+ offsetof (struct user, u_debugreg[data->regnum]), data->value);
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if (errno != 0)
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perror_with_name (_("Couldn't write debug register"));
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+ return 1;
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+}
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+
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+static int
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+i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
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+{
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+ struct i386_linux_dr_set data;
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+ int tid;
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+
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+ data.tid = TIDGET (ptid);
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+ if (data.tid == 0)
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+ data.tid = PIDGET (ptid);
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+
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+ data.regnum = regnum;
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+ data.value = value;
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+
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+ return catch_errors (i386_linux_dr_set_core, &data, "", RETURN_MASK_ALL);
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}
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void
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Index: gdb-6.8cvs20080219/gdb/Makefile.in
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===================================================================
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--- gdb-6.8cvs20080219.orig/gdb/Makefile.in 2008-02-24 09:13:35.000000000 +0100
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+++ gdb-6.8cvs20080219/gdb/Makefile.in 2008-02-24 09:14:26.000000000 +0100
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@@ -2252,7 +2252,7 @@ i386gnu-tdep.o: i386gnu-tdep.c $(defs_h)
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i386-linux-nat.o: i386-linux-nat.c $(defs_h) $(inferior_h) $(gdbcore_h) \
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$(regcache_h) $(linux_nat_h) $(gdb_assert_h) $(gdb_string_h) \
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$(gregset_h) $(i387_tdep_h) $(i386_tdep_h) $(i386_linux_tdep_h) \
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- $(gdb_proc_service_h) $(target_h)
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+ $(gdb_proc_service_h) $(target_h) $(exceptions_h)
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i386-linux-tdep.o: i386-linux-tdep.c $(defs_h) $(gdbcore_h) $(frame_h) \
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$(value_h) $(regcache_h) $(inferior_h) $(osabi_h) $(reggroups_h) \
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$(dwarf2_frame_h) $(gdb_string_h) $(i386_tdep_h) \
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