Fix 'Make the probes-based dynamic linker interface more robust to errors' (Sergio Durigan Junior, RH BZ 1259132).
This commit is contained in:
Sergio Durigan Junior
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2f1c4cf200
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193
gdb-probes-based-interface-robust-1of2.patch
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193
gdb-probes-based-interface-robust-1of2.patch
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From f469e8ce11672e26feb5ba6f9a134275fcfd5b4f Mon Sep 17 00:00:00 2001
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From: Sergio Durigan Junior <sergiodj@redhat.com>
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Date: Fri, 21 Aug 2015 18:13:46 -0400
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Subject: [PATCH 1/4] Improve error reporting when handling SystemTap SDT
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probes
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This patch improves the error reporting when handling SystemTap SDT
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probes. "Handling", in this case, mostly means "parsing".
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On gdb/probe.h, only trivial changes on functions' comments in order
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to explicitly mention that some of them can throw exceptions. This is
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just to make the API a bit more clear.
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On gdb/stap-probe.c, I have s/internal_error/error/ on two functions
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that are responsible for parsing specific bits of the probes'
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arguments: stap_get_opcode and stap_get_expected_argument_type. It is
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not correct to call internal_error on such situations because it is
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not really GDB's fault if the probes have malformed arguments. I also
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improved the error reported on stap_get_expected_argument_type by also
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including the probe name on it.
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Aside from that, and perhaps most importantly, I added a check on
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stap_get_arg to make sure that we don't try to extract an argument
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from a probe that has no arguments. This check issues an
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internal_error, because it really means that GDB is doing something it
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shouldn't.
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Although it can be considered almost trivial, and despite the fact
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that I am the maintainer for this part of the code, I am posting this
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patch for review. I will wait a few days, and if nobody has anything
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to say, I will go ahead and push it.
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gdb/ChangeLog:
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2015-09-01 Sergio Durigan Junior <sergiodj@redhat.com>
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* probe.h (struct probe_ops) <get_probe_argument_count,
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evaluate_probe_argument, enable_probe, disable_probe>: Mention in
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the comment that the function can throw an exception.
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(get_probe_argument_count): Likewise.
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(evaluate_probe_argument): Likewise.
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* stap-probe.c (stap_get_opcode): Call error instead of
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internal_error.
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(stap_get_expected_argument_type): Likewise. Add argument
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'probe'. Improve error message by mentioning the probe's name.
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(stap_parse_probe_arguments): Adjust call to
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stap_get_expected_argument_type.
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(stap_get_arg): Add comment. Assert that 'probe->args_parsed' is
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not zero. Call internal_error if GDB requests an argument but the
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probe has no arguments.
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---
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gdb/ChangeLog | 17 +++++++++++++++++
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gdb/probe.h | 20 ++++++++++++++------
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gdb/stap-probe.c | 29 ++++++++++++++++++++++-------
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3 files changed, 53 insertions(+), 13 deletions(-)
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Index: gdb-7.10/gdb/probe.h
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===================================================================
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--- gdb-7.10.orig/gdb/probe.h
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+++ gdb-7.10/gdb/probe.h
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@@ -70,7 +70,8 @@ struct probe_ops
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CORE_ADDR (*get_probe_address) (struct probe *probe,
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struct objfile *objfile);
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- /* Return the number of arguments of PROBE. */
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+ /* Return the number of arguments of PROBE. This function can
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+ throw an exception. */
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unsigned (*get_probe_argument_count) (struct probe *probe,
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struct frame_info *frame);
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@@ -82,7 +83,8 @@ struct probe_ops
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int (*can_evaluate_probe_arguments) (struct probe *probe);
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/* Evaluate the Nth argument from the PROBE, returning a value
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- corresponding to it. The argument number is represented N. */
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+ corresponding to it. The argument number is represented N.
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+ This function can throw an exception. */
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struct value *(*evaluate_probe_argument) (struct probe *probe,
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unsigned n,
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@@ -141,13 +143,15 @@ struct probe_ops
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/* Enable a probe. The semantics of "enabling" a probe depend on
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the specific backend and the field can be NULL in case enabling
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- probes is not supported. */
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+ probes is not supported. This function can throw an
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+ exception. */
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void (*enable_probe) (struct probe *probe);
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/* Disable a probe. The semantics of "disabling" a probe depend
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on the specific backend and the field can be NULL in case
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- disabling probes is not supported. */
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+ disabling probes is not supported. This function can throw an
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+ exception. */
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void (*disable_probe) (struct probe *probe);
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};
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@@ -264,7 +268,9 @@ extern struct cmd_list_element **info_pr
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extern CORE_ADDR get_probe_address (struct probe *probe,
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struct objfile *objfile);
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-/* Return the argument count of the specified probe. */
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+/* Return the argument count of the specified probe.
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+
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+ This function can throw an exception. */
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extern unsigned get_probe_argument_count (struct probe *probe,
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struct frame_info *frame);
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@@ -276,7 +282,9 @@ extern unsigned get_probe_argument_count
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extern int can_evaluate_probe_arguments (struct probe *probe);
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/* Evaluate argument N of the specified probe. N must be between 0
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- inclusive and get_probe_argument_count exclusive. */
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+ inclusive and get_probe_argument_count exclusive.
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+
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+ This function can throw an exception. */
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extern struct value *evaluate_probe_argument (struct probe *probe,
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unsigned n,
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Index: gdb-7.10/gdb/stap-probe.c
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===================================================================
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--- gdb-7.10.orig/gdb/stap-probe.c
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+++ gdb-7.10/gdb/stap-probe.c
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@@ -313,9 +313,8 @@ stap_get_opcode (const char **s)
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break;
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default:
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- internal_error (__FILE__, __LINE__,
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- _("Invalid opcode in expression `%s' for SystemTap"
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- "probe"), *s);
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+ error (_("Invalid opcode in expression `%s' for SystemTap"
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+ "probe"), *s);
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}
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return op;
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@@ -326,7 +325,8 @@ stap_get_opcode (const char **s)
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static struct type *
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stap_get_expected_argument_type (struct gdbarch *gdbarch,
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- enum stap_arg_bitness b)
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+ enum stap_arg_bitness b,
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+ const struct stap_probe *probe)
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{
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switch (b)
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{
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@@ -361,8 +361,8 @@ stap_get_expected_argument_type (struct
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return builtin_type (gdbarch)->builtin_uint64;
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default:
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- internal_error (__FILE__, __LINE__,
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- _("Undefined bitness for probe."));
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+ error (_("Undefined bitness for probe '%s'."),
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+ probe->p.name);
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break;
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}
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}
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@@ -1172,7 +1172,8 @@ stap_parse_probe_arguments (struct stap_
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else
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arg.bitness = STAP_ARG_BITNESS_UNDEFINED;
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- arg.atype = stap_get_expected_argument_type (gdbarch, arg.bitness);
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+ arg.atype = stap_get_expected_argument_type (gdbarch, arg.bitness,
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+ probe);
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expr = stap_parse_argument (&cur, arg.atype, gdbarch);
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@@ -1278,12 +1279,26 @@ stap_is_operator (const char *op)
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return ret;
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}
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+/* Return argument N of probe PROBE.
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+
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+ If the probe's arguments have not been parsed yet, parse them. If
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+ there are no arguments, throw an exception (error). Otherwise,
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+ return the requested argument. */
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+
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static struct stap_probe_arg *
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stap_get_arg (struct stap_probe *probe, unsigned n, struct gdbarch *gdbarch)
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{
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if (!probe->args_parsed)
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stap_parse_probe_arguments (probe, gdbarch);
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+ gdb_assert (probe->args_parsed);
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+ if (probe->args_u.vec == NULL)
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+ internal_error (__FILE__, __LINE__,
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+ _("Probe '%s' apparently does not have arguments, but \n"
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+ "GDB is requesting its argument number %u anyway. "
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+ "This should not happen. Please report this bug."),
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+ probe->p.name, n);
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+
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return VEC_index (stap_probe_arg_s, probe->args_u.vec, n);
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}
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194
gdb-probes-based-interface-robust-2of2.patch
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194
gdb-probes-based-interface-robust-2of2.patch
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@ -0,0 +1,194 @@
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From 3bd7e5b7ee5ea0b3bbb4030ca841f66faad74f0f Mon Sep 17 00:00:00 2001
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From: Sergio Durigan Junior <sergiodj@redhat.com>
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Date: Fri, 21 Aug 2015 18:28:07 -0400
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Subject: [PATCH 2/4] Catching errors on probes-based dynamic linker interface
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This patch is intended to make the interaction between the
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probes-based dynamic linker interface and the SystemTap SDT probe code
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on GDB more robust. It does that by wrapping the calls to the probe
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API with TRY...CATCH'es, so that any exception thrown will be caught
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and handled properly.
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The idea for this patch came from
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<https://bugzilla.redhat.com/show_bug.cgi?id=1196181>, which is a bug
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initially filed against Fedora GDB (but now under Fedora GLIBC). This
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bug happens on armhfp (although it could happen on other targets as
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well), and is triggered because GCC generates a strange argument for
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one of the probes used by GDB in the dynamic linker interface. As can
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be seen in the bug, this argument is "-4@.L1052".
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I don't want to discuss the reasons for this argument to be there
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(this discussion belongs to the bug, or to another thread), but GDB
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could definitely do a better error handling here. Currently, one sees
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the following message when there is an error in the probes-based
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dynamic linker interface:
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(gdb) run
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Starting program: /bin/inferior
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warning: Probes-based dynamic linker interface failed.
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Reverting to original interface.
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Cannot parse expression `.L976 4@r4'.
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(gdb)
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Which means that one needs to explicitly issue a "continue" command to
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make GDB continue running the inferior, even though this error is not
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fatal and GDB will fallback to the old interface automatically.
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This is where this patch helps: it makes GDB still print the necessary
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warnings or error messages, but it *also* does not stop the inferior
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unnecessarily.
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I have tested this patch on the systems where this error happens, but
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I could not come up with a way to create a testcase for it.
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Nevertheless, it should be straightforward to see that this patch does
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improve the current situation.
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gdb/ChangeLog:
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2015-09-01 Sergio Durigan Junior <sergiodj@redhat.com>
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* solib-svr4.c (solib_event_probe_action): Call
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get_probe_argument_count using TRY...CATCH.
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(svr4_handle_solib_event): Likewise, for evaluate_probe_argument.
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---
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gdb/ChangeLog | 6 ++++++
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gdb/solib-svr4.c | 43 ++++++++++++++++++++++++++++++++++++++++---
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2 files changed, 46 insertions(+), 3 deletions(-)
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Index: gdb-7.10/gdb/solib-svr4.c
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===================================================================
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--- gdb-7.10.orig/gdb/solib-svr4.c
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+++ gdb-7.10/gdb/solib-svr4.c
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@@ -1796,7 +1796,23 @@ solib_event_probe_action (struct probe_a
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arg0: Lmid_t lmid (mandatory)
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arg1: struct r_debug *debug_base (mandatory)
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arg2: struct link_map *new (optional, for incremental updates) */
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- probe_argc = get_probe_argument_count (pa->probe, frame);
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+ TRY
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+ {
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+ probe_argc = get_probe_argument_count (pa->probe, frame);
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+ }
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+ CATCH (ex, RETURN_MASK_ERROR)
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+ {
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+ exception_print (gdb_stderr, ex);
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+ probe_argc = 0;
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+ }
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+ END_CATCH
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+
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+ /* If get_probe_argument_count throws an exception, probe_argc will
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+ be set to zero. However, if pa->probe does not have arguments,
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+ then get_probe_argument_count will succeed but probe_argc will
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+ also be zero. Both cases happen because of different things, but
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+ they are treated equally here: action will be set to
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+ PROBES_INTERFACE_FAILED. */
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if (probe_argc == 2)
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action = FULL_RELOAD;
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else if (probe_argc < 2)
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@@ -1950,7 +1966,17 @@ svr4_handle_solib_event (void)
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usm_chain = make_cleanup (resume_section_map_updates_cleanup,
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current_program_space);
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- val = evaluate_probe_argument (pa->probe, 1, frame);
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+ TRY
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+ {
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+ val = evaluate_probe_argument (pa->probe, 1, frame);
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+ }
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+ CATCH (ex, RETURN_MASK_ERROR)
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+ {
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+ exception_print (gdb_stderr, ex);
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+ val = NULL;
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+ }
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+ END_CATCH
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+
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if (val == NULL)
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{
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do_cleanups (old_chain);
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@@ -1981,7 +2007,18 @@ svr4_handle_solib_event (void)
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if (action == UPDATE_OR_RELOAD)
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{
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- val = evaluate_probe_argument (pa->probe, 2, frame);
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+ TRY
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+ {
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+ val = evaluate_probe_argument (pa->probe, 2, frame);
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+ }
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+ CATCH (ex, RETURN_MASK_ERROR)
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+ {
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+ exception_print (gdb_stderr, ex);
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+ do_cleanups (old_chain);
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+ return;
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+ }
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+ END_CATCH
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+
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if (val != NULL)
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lm = value_as_address (val);
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From ad1c917a79e8c5aa67657f148415c1bee01b240f Mon Sep 17 00:00:00 2001
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From: Sergio Durigan Junior <sergiodj@redhat.com>
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Date: Wed, 2 Sep 2015 00:34:22 -0400
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Subject: [PATCH 3/4] Initialize variable and silence GCC warning from last
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commit
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BuildBot e-mailed me to let me know that my last commit broke GDB on
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RHEL-7.1 s390x. On solib-svr4.c:svr4_handle_solib_event, 'val' now
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needs to be initialized as NULL because it is inside a TRY..CATCH
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block. This patch does that. Pushed as obvious.
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gdb/ChangeLog:
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2015-09-01 Sergio Durigan Junior <sergiodj@redhat.com>
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* solib-svr4.c (svr4_handle_solib_event): Initialize 'val' as NULL
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---
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gdb/ChangeLog | 4 ++++
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gdb/solib-svr4.c | 2 +-
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2 files changed, 5 insertions(+), 1 deletion(-)
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Index: gdb-7.10/gdb/solib-svr4.c
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===================================================================
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--- gdb-7.10.orig/gdb/solib-svr4.c
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+++ gdb-7.10/gdb/solib-svr4.c
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@@ -1918,7 +1918,7 @@ svr4_handle_solib_event (void)
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struct probe_and_action *pa;
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enum probe_action action;
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struct cleanup *old_chain, *usm_chain;
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- struct value *val;
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||||||
|
+ struct value *val = NULL;
|
||||||
|
CORE_ADDR pc, debug_base, lm = 0;
|
||||||
|
int is_initial_ns;
|
||||||
|
struct frame_info *frame = get_current_frame ();
|
||||||
|
From 73c6b4756a7cee53c274ed05fddcd079b8b7e57c Mon Sep 17 00:00:00 2001
|
||||||
|
From: Sergio Durigan Junior <sergiodj@redhat.com>
|
||||||
|
Date: Wed, 2 Sep 2015 00:46:43 -0400
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||||||
|
Subject: [PATCH 4/4] Initialize yet another variable to silence GCC warning
|
||||||
|
from last-but-one commit
|
||||||
|
|
||||||
|
Yet another BuildBot e-mail, yet another breakage on RHEL-7.1 s390x
|
||||||
|
(which uses an older GCC). This time,
|
||||||
|
solib-svr4.c:solib_event_probe_action has the probe_argc variable,
|
||||||
|
which is now inside a TRY..CATCH and therefore needs to be
|
||||||
|
initialized. Pushed as obvious.
|
||||||
|
|
||||||
|
gdb/ChangeLog:
|
||||||
|
2015-09-01 Sergio Durigan Junior <sergiodj@redhat.com>
|
||||||
|
|
||||||
|
* solib-svr4.c (solib_event_probe_action): Initialize 'probe_argc'
|
||||||
|
as zero.
|
||||||
|
---
|
||||||
|
gdb/ChangeLog | 5 +++++
|
||||||
|
gdb/solib-svr4.c | 2 +-
|
||||||
|
2 files changed, 6 insertions(+), 1 deletion(-)
|
||||||
|
|
||||||
|
2015-09-01 Sergio Durigan Junior <sergiodj@redhat.com>
|
||||||
|
Index: gdb-7.10/gdb/solib-svr4.c
|
||||||
|
===================================================================
|
||||||
|
--- gdb-7.10.orig/gdb/solib-svr4.c
|
||||||
|
+++ gdb-7.10/gdb/solib-svr4.c
|
||||||
|
@@ -1782,7 +1782,7 @@ static enum probe_action
|
||||||
|
solib_event_probe_action (struct probe_and_action *pa)
|
||||||
|
{
|
||||||
|
enum probe_action action;
|
||||||
|
- unsigned probe_argc;
|
||||||
|
+ unsigned probe_argc = 0;
|
||||||
|
struct frame_info *frame = get_current_frame ();
|
||||||
|
|
||||||
|
action = pa->action;
|
||||||
13
gdb.spec
13
gdb.spec
@ -26,7 +26,7 @@ Version: 7.10
|
|||||||
|
|
||||||
# The release always contains a leading reserved number, start it at 1.
|
# The release always contains a leading reserved number, start it at 1.
|
||||||
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
|
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
|
||||||
Release: 16%{?dist}
|
Release: 17%{?dist}
|
||||||
|
|
||||||
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and BSD and Public Domain and GFDL
|
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and BSD and Public Domain and GFDL
|
||||||
Group: Development/Debuggers
|
Group: Development/Debuggers
|
||||||
@ -535,6 +535,11 @@ Patch927: gdb-python-gil.patch
|
|||||||
# Fix jit-reader.h for multi-lib.
|
# Fix jit-reader.h for multi-lib.
|
||||||
Patch978: gdb-jit-reader-multilib.patch
|
Patch978: gdb-jit-reader-multilib.patch
|
||||||
|
|
||||||
|
# Fix 'Make the probes-based dynamic linker interface more robust to
|
||||||
|
# errors' (Sergio Durigan Junior, RH BZ 1259132).
|
||||||
|
Patch1029: gdb-probes-based-interface-robust-1of2.patch
|
||||||
|
Patch1030: gdb-probes-based-interface-robust-2of2.patch
|
||||||
|
|
||||||
%if 0%{!?rhel:1} || 0%{?rhel} > 6
|
%if 0%{!?rhel:1} || 0%{?rhel} > 6
|
||||||
# RL_STATE_FEDORA_GDB would not be found for:
|
# RL_STATE_FEDORA_GDB would not be found for:
|
||||||
# Patch642: gdb-readline62-ask-more-rh.patch
|
# Patch642: gdb-readline62-ask-more-rh.patch
|
||||||
@ -821,6 +826,8 @@ find -name "*.info*"|xargs rm -f
|
|||||||
%patch925 -p1
|
%patch925 -p1
|
||||||
%patch927 -p1
|
%patch927 -p1
|
||||||
%patch978 -p1
|
%patch978 -p1
|
||||||
|
%patch1029 -p1
|
||||||
|
%patch1030 -p1
|
||||||
|
|
||||||
%patch848 -p1
|
%patch848 -p1
|
||||||
%if 0%{!?el6:1}
|
%if 0%{!?el6:1}
|
||||||
@ -1325,6 +1332,10 @@ then
|
|||||||
fi
|
fi
|
||||||
|
|
||||||
%changelog
|
%changelog
|
||||||
|
* Wed Sep 2 2015 Sergio Durigan Junior <sergiodj@redhat.com> - 7.10-17.fc23
|
||||||
|
- Fix 'Make the probes-based dynamic linker interface more robust to
|
||||||
|
errors' (Sergio Durigan Junior, RH BZ 1259132).
|
||||||
|
|
||||||
* Tue Sep 1 2015 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.10-16.fc23
|
* Tue Sep 1 2015 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.10-16.fc23
|
||||||
- [RHEL] Fix librpm Recommends compatibility.
|
- [RHEL] Fix librpm Recommends compatibility.
|
||||||
|
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user