+2017-02-09 Ulf Hermann <ulf.hermann@qt.io>
+
+ * x86_64_unwind.c: New file
+ * Makefile.am (x86_64_SRCS): Add x86_64_unwind.c
+ * x86_64_init.c (x86_64_init): Hook x86_64_unwind
+
2017-04-20 Ulf Hermann <ulf.hermann@qt.io>
* aarch64_initreg.c: Compile register initialization only on linux.
x86_64_SRCS = x86_64_init.c x86_64_symbol.c x86_64_corenote.c x86_64_cfi.c \
x86_64_retval.c x86_64_regs.c i386_auxv.c x86_64_syscall.c \
- x86_64_initreg.c x32_corenote.c
+ x86_64_initreg.c x86_64_unwind.c x32_corenote.c
cpu_x86_64 = ../libcpu/libcpu_x86_64.a
libebl_x86_64_pic_a_SOURCES = $(x86_64_SRCS)
am_libebl_x86_64_pic_a_OBJECTS = $(x86_64_SRCS:.c=.os)
/* gcc/config/ #define DWARF_FRAME_REGISTERS. */
eh->frame_nregs = 17;
HOOK (eh, set_initial_registers_tid);
+ HOOK (eh, unwind);
return MODVERSION;
}
--- /dev/null
+/* Get previous frame state for an existing frame state.
+ Copyright (C) 2016 The Qt Company Ltd.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <assert.h>
+
+#define BACKEND x86_64_
+#include "libebl_CPU.h"
+
+/* There was no CFI. Maybe we happen to have a frame pointer and can unwind from that? */
+
+bool
+x86_64_unwind (Ebl *ebl __attribute__ ((unused)),
+ Dwarf_Addr pc __attribute__ ((unused)),
+ ebl_tid_registers_t *setfunc, ebl_tid_registers_get_t *getfunc,
+ ebl_pid_memory_read_t *readfunc, void *arg,
+ bool *signal_framep __attribute__ ((unused)))
+{
+ // Register 6 is supposed to be rbp, thus the conventional frame pointer
+ const int fpReg = 6;
+ const int spReg = 7;
+
+ Dwarf_Word fp;
+ if (!getfunc(fpReg, 1, &fp, arg) || fp == 0)
+ return false;
+
+ // Try to read old sp, so that we can avoid infinite loops below
+ Dwarf_Word sp;
+ if (!getfunc(spReg, 1, &sp, arg))
+ sp = 0;
+
+ Dwarf_Word prev_fp;
+ if (!readfunc(fp, &prev_fp, arg))
+ prev_fp = 0;
+
+ Dwarf_Word ret;
+ if (!readfunc(fp + 8, &ret, arg))
+ return false;
+
+ if (!setfunc(fpReg, 1, &prev_fp, arg))
+ return false;
+
+ fp += 16; // Pop fp and return address and write result to sp
+ if (!setfunc(spReg, 1, &fp, arg))
+ return false;
+
+ if (!setfunc(-1, 1, &ret, arg))
+ return false;
+
+ // If the sp didn't move up we don't actually have a new stack
+ // frame but rather some random data that doesn't include frame
+ // pointers. Break the unwinding then.
+ if (sp >= fp)
+ return false;
+
+ return true;
+}
+2017-02-09 Ulf Hermann <ulf.hermann@qt.io>
+
+ * Makefile.am: Add test for unwinding with frame pointers on x86_64
+ * backtrace.x86_64.fp.core.bz2: New file
+ * backtrace.x86_64.fp.exec.bz2: New file
+ * run-backtrace-fp-core-x86_64.sh: New file
+
2017-04-25 Mark Wielaard <mark@klomp.org>
* backtrace-subr.sh (check_backtracegen): New function.
run-backtrace-native.sh run-backtrace-data.sh run-backtrace-dwarf.sh \
run-backtrace-native-biarch.sh run-backtrace-native-core.sh \
run-backtrace-native-core-biarch.sh run-backtrace-core-x86_64.sh \
+ run-backtrace-fp-core-x86_64.sh \
run-backtrace-core-x32.sh \
run-backtrace-core-i386.sh run-backtrace-core-ppc.sh \
run-backtrace-core-s390x.sh run-backtrace-core-s390.sh \
run-backtrace-native.sh run-backtrace-native-biarch.sh \
run-backtrace-native-core.sh run-backtrace-native-core-biarch.sh \
run-backtrace-core-x86_64.sh run-backtrace-core-i386.sh \
+ run-backtrace-fp-core-x86_64.sh \
run-backtrace-core-x32.sh \
backtrace-subr.sh backtrace.i386.core.bz2 backtrace.i386.exec.bz2 \
backtrace.x86_64.core.bz2 backtrace.x86_64.exec.bz2 \
+ backtrace.x86_64.fp.core.bz2 backtrace.x86_64.fp.exec.bz2 \
backtrace.ppc.core.bz2 backtrace.ppc.exec.bz2 \
run-backtrace-core-ppc.sh testfile66.bz2 testfile66.core.bz2 \
backtrace.s390x.core.bz2 backtrace.s390x.exec.bz2 \
--- /dev/null
+#! /bin/bash
+# Copyright (C) 2017 The Qt Company
+# This file is part of elfutils.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# elfutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+. $srcdir/backtrace-subr.sh
+
+# The binary is generated by compiling with eh_frame CFI, but with frame
+# pointers.
+#
+# gcc -static -O2 -fno-omit-frame-pointer -fno-asynchronous-unwind-tables \
+# -D_GNU_SOURCE -pthread -o tests/backtrace.x86_64.fp.exec -I. -Ilib \
+# tests/backtrace-child.c
+#
+# The core is generated by calling the binary with --gencore
+
+check_core x86_64.fp
projects / thirdparty / elfutils.git / commitdiff
