From patchwork Tue Mar 15 18:15:44 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ken Werner X-Patchwork-Id: 585 Return-Path: Delivered-To: unknown Received: from imap.gmail.com (74.125.159.109) by localhost6.localdomain6 with IMAP4-SSL; 08 Jun 2011 14:44:00 -0000 Delivered-To: patches@linaro.org Received: by 10.151.46.5 with SMTP id y5cs77950ybj; Tue, 15 Mar 2011 11:15:56 -0700 (PDT) Received: by 10.216.49.15 with SMTP id w15mr3986452web.1.1300212954011; Tue, 15 Mar 2011 11:15:54 -0700 (PDT) Received: from mtagate6.uk.ibm.com (mtagate6.uk.ibm.com [194.196.100.166]) by mx.google.com with ESMTPS id u30si92086wei.171.2011.03.15.11.15.52 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 15 Mar 2011 11:15:52 -0700 (PDT) Received-SPF: neutral (google.com: 194.196.100.166 is neither permitted nor denied by best guess record for domain of ken.werner@linaro.org) client-ip=194.196.100.166; Authentication-Results: mx.google.com; spf=neutral (google.com: 194.196.100.166 is neither permitted nor denied by best guess record for domain of ken.werner@linaro.org) smtp.mail=ken.werner@linaro.org Received: from d06nrmr1307.portsmouth.uk.ibm.com (d06nrmr1307.portsmouth.uk.ibm.com [9.149.38.129]) by mtagate6.uk.ibm.com (8.13.1/8.13.1) with ESMTP id p2FIFlc0032466 for ; Tue, 15 Mar 2011 18:15:47 GMT Received: from d06av09.portsmouth.uk.ibm.com (d06av09.portsmouth.uk.ibm.com [9.149.37.250]) by d06nrmr1307.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p2FIG6gs1523880 for ; Tue, 15 Mar 2011 18:16:06 GMT Received: from d06av09.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av09.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p2FIFkZ5008783 for ; Tue, 15 Mar 2011 12:15:46 -0600 Received: from localhost.localdomain (dyn-9-152-224-51.boeblingen.de.ibm.com [9.152.224.51]) by d06av09.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p2FIFjde008732; Tue, 15 Mar 2011 12:15:46 -0600 From: Ken Werner To: libunwind-devel@nongnu.org Subject: [PATCH 4/4] Add test of backtracing using ARM-specific tables Date: Tue, 15 Mar 2011 18:15:44 +0000 Message-Id: <1300212944-24984-5-git-send-email-ken.werner@linaro.org> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1300212944-24984-1-git-send-email-ken.werner@linaro.org> References: <1300212944-24984-1-git-send-email-ken.werner@linaro.org> From: Zachary T Welch Uses .ARM.exidx and .ARM.extbl sections to produce a backtrace. Signed-off-by: Ken Werner --- .gitignore | 1 + tests/Makefile.am | 11 ++++++ tests/arm-extbl-test.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+), 0 deletions(-) create mode 100644 tests/arm-extbl-test.c diff --git a/.gitignore b/.gitignore index d3ed395..ddf9372 100644 --- a/.gitignore +++ b/.gitignore @@ -50,3 +50,4 @@ tests/test-strerror tests/test-proc-info tests/test-ptrace-misc tests/test-varargs +tests/arm-extbl-test diff --git a/tests/Makefile.am b/tests/Makefile.am index 4d86445..5b50529 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -46,6 +46,9 @@ endif #ARCH_IA64 Ltest-nomalloc rs-race noinst_PROGRAMS_cdep = forker mapper test-ptrace-misc test-varargs \ Gperf-simple Lperf-simple +if ARCH_ARM + check_PROGRAMS_arch = arm-extbl-test +endif #ARCH_ARM if SUPPORT_CXX_EXCEPTIONS check_PROGRAMS_cdep += Ltest-cxx-exceptions @@ -72,6 +75,11 @@ TESTS = $(check_PROGRAMS) $(check_SCRIPTS) noinst_PROGRAMS = $(noinst_PROGRAMS_common) $(noinst_PROGRAMS_cdep) \ $(noinst_PROGRAMS_arch) +arm_extbl_test_CPPFLAGS = -I$(top_srcdir)/src \ + -I$(top_srcdir)/include/tdep-$(arch) \ + -funwind-tables +arm_extbl_test_LDFLAGS = -static + Lia64_test_readonly_SOURCES = Lia64-test-readonly.c ia64-test-readonly-asm.S Gia64_test_readonly_SOURCES = Gia64-test-readonly.c ia64-test-readonly-asm.S Lia64_test_stack_SOURCES = Lia64-test-stack.c ia64-test-stack-asm.S \ @@ -85,6 +93,7 @@ Gia64_test_nat_SOURCES = Gia64-test-nat.c ia64-test-nat-asm.S ia64_test_dyn1_SOURCES = ia64-test-dyn1.c ia64-dyn-asm.S flush-cache.S ppc64_test_altivec_SOURCES = ppc64-test-altivec.c ppc64-test-altivec-utils.c ppc64_test_wchar_SOURCES = ppc64-test-wchar.c +arm_extbl_test_SOURCES = arm-extbl-test.c Gtest_init_SOURCES = Gtest-init.cxx Ltest_init_SOURCES = Ltest-init.cxx Ltest_cxx_exceptions_SOURCES = Ltest-cxx-exceptions.cxx @@ -133,3 +142,5 @@ Lperf_simple_LDADD = $(LIBUNWIND_local) test_setjmp_LDADD = $(LIBUNWIND_setjmp) ia64_test_setjmp_LDADD = $(LIBUNWIND_setjmp) + +arm_extbl_test_LDADD = $(top_builddir)/src/libunwind-elf32.la $(LIBUNWIND) diff --git a/tests/arm-extbl-test.c b/tests/arm-extbl-test.c new file mode 100644 index 0000000..752f59f --- /dev/null +++ b/tests/arm-extbl-test.c @@ -0,0 +1,95 @@ +/* libunwind - a platform-independent unwind library + Copyright 2011 Linaro Limited + +This file is part of libunwind. + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ + +#include "libunwind_i.h" + +static int +arm_exidx_unwind_frame (struct arm_stackframe *frame) +{ + Debug (2, "frame: fp=%p, sp=%p, lr=%p, pc=%p\n", + frame->fp, frame->sp, frame->lr, frame->pc); + + struct arm_exidx_table *table = arm_exidx_table_find (frame->pc); + if (NULL == table) + return -1; + + struct arm_exidx_entry *entry = arm_exidx_table_lookup (table, frame->pc); + if (NULL == entry) + return -1; + + struct arm_exidx_vrs s; + arm_exidx_frame_to_vrs(frame, &s); + + uint8_t buf[32], n_buf = arm_exidx_extract (entry, buf); + if (arm_exidx_decode (buf, n_buf, &arm_exidx_vrs_callback, &s) < 0) + return -1; + + return arm_exidx_vrs_to_frame(&s, frame); +} + +typedef void (*arm_exidx_backtrace_callback_t) (void *, struct arm_stackframe *); + +static int +arm_exidx_backtrace (arm_exidx_backtrace_callback_t cb) +{ + register void *current_sp asm ("sp"); + struct arm_stackframe frame = { + .fp = __builtin_frame_address (0), + .sp = current_sp, + .lr = __builtin_return_address (0), + .pc = &arm_exidx_backtrace, + }; + + while (1) + { + void *where = frame.pc; + if (arm_exidx_unwind_frame (&frame) < 0) + break; + (*cb) (where, &frame); + } + return 0; +} + +static void +b (void *where, struct arm_stackframe *frame) +{ + Debug (2, "%p -> %p (%p)\n", where, frame->pc, frame->sp - 4); +} + +static int +a (int foo) +{ + if (foo > 0) + return a (foo - 1); + arm_exidx_backtrace (&b); + return foo; +} + +int +main (int argc, char *argv[]) +{ + mi_init (); + arm_exidx_init_local (argv[0]); + return a (argc); +}