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[patch v6 3/5] x86* unwinder: libdwfl/
- From: Jan Kratochvil <jan dot kratochvil at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Fri, 11 Oct 2013 22:47:14 +0200
- Subject: [patch v6 3/5] x86* unwinder: libdwfl/
libdw/
2013-06-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* cfi.h (struct Dwarf_Frame_s): Make the comment more specific.
* libdw.map (ELFUTILS_0.156): Add dwfl_attach_state, dwfl_pid,
dwfl_thread_dwfl, dwfl_thread_tid, dwfl_frame_thread,
dwfl_thread_state_registers, dwfl_thread_state_register_pc,
dwfl_next_thread, dwfl_thread_getframes and dwfl_frame_pc.
libdwfl/
2013-09-02 Jan Kratochvil <jan.kratochvil@redhat.com>
Mark Wielaard <mjw@redhat.com>
* Makefile.am (AM_CPPFLAGS): Add ../libasm.
(libdwfl_a_SOURCES): Add dwfl_frame.c, dwfl_frame_unwind.c,
dwfl_frame_pc.c, dwfl_frame_pid.c, dwfl_frame_core.c and
dwfl_frame_regs.c.
* core-file.c (dwfl_core_file_report): Call
__libdwfl_attach_state_for_core.
* dwfl_end.c (dwfl_end): Call __libdwfl_process_free.
* dwfl_frame.c: New file.
* dwfl_frame_unwind.c: New file.
* dwfl_frame_pc.c: New file.
* dwfl_frame_pid.c: New file.
* dwfl_frame_core.c: New file.
* dwfl_frame_regs.c: New file.
* libdwfl.h (Dwfl_Thread, Dwfl_Frame): New typedefs.
(dwfl_core_file_report, dwfl_linux_proc_report): Extend comments.
(Dwfl_Thread_Callbacks): New definition.
(struct ebl, dwfl_attach_state, dwfl_pid, dwfl_thread_dwfl)
(dwfl_thread_tid, dwfl_frame_thread, dwfl_thread_state_registers)
(dwfl_thread_state_register_pc, dwfl_next_thread, dwfl_thread_getframes)
(dwfl_frame_pc): New declarations.
* libdwflP.h: Include libeblP.h.
(Dwfl_Process): New typedef.
(LIBEBL_BAD, CORE_MISSING, INVALID_REGISTER, PROCESS_MEMORY_READ)
(PROCESS_NO_ARCH, PARSE_PROC, NO_THREAD, INVALID_DWARF)
(UNSUPPORTED_DWARF, NEXT_THREAD_FAIL, ATTACH_STATE_CONFLICT)
(NO_ATTACH_STATE): New DWFL_ERROR entries.
(struct Dwfl): New entry process.
(struct Dwfl_Process, struct Dwfl_Thread, struct Dwfl_Frame)
(dwfl_frame_reg_get, dwfl_frame_reg_set): New definitions.
(__libdwfl_process_free, __libdwfl_frame_unwind)
(__libdwfl_attach_state_for_pid, __libdwfl_attach_state_for_core)
(__libdwfl_segment_start, __libdwfl_segment_end): New declarations.
(dwfl_attach_state, dwfl_pid, dwfl_thread_dwfl, dwfl_thread_tid)
(dwfl_frame_thread, dwfl_thread_state_registers)
(dwfl_thread_state_register_pc, dwfl_next_thread, dwfl_thread_getframes)
(dwfl_frame_pc): New INTDECL entries.
* linux-proc-maps.c (dwfl_linux_proc_report): Call
__libdwfl_attach_state_for_pid.
* segment.c (segment_start): Rename to ...
(__libdwfl_segment_start): ... here and make it internal_function.
(segment_end): Rename to ...
(__libdwfl_segment_end): ... here and make it internal_function.
(reify_segments, dwfl_report_segment): Rename them at the callers.
Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
--- a/libdw/cfi.h
+++ b/libdw/cfi.h
@@ -1,5 +1,5 @@
/* Internal definitions for libdw CFI interpreter.
- Copyright (C) 2009-2010 Red Hat, Inc.
+ Copyright (C) 2009-2010, 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -150,8 +150,8 @@ struct dwarf_frame_register
Dwarf_Sword value:(sizeof (Dwarf_Sword) * 8 - 3);
};
-/* This holds everything we know about the state of the frame
- at a particular PC location described by an FDE. */
+/* This holds instructions for unwinding frame at a particular PC location
+ described by an FDE. */
struct Dwarf_Frame_s
{
/* This frame description covers PC values in [start, end). */
--- a/libdw/libdw.map
+++ b/libdw/libdw.map
@@ -259,6 +259,16 @@ ELFUTILS_0.156 {
global:
# Replaced ELFUTILS_0.122 version, which has a wrapper without add_p_vaddr.
dwfl_report_elf;
+ dwfl_attach_state;
+ dwfl_pid;
+ dwfl_thread_dwfl;
+ dwfl_thread_tid;
+ dwfl_frame_thread;
+ dwfl_thread_state_registers;
+ dwfl_thread_state_register_pc;
+ dwfl_next_thread;
+ dwfl_thread_getframes;
+ dwfl_frame_pc;
} ELFUTILS_0.149;
ELFUTILS_0.157 {
--- a/libdwfl/Makefile.am
+++ b/libdwfl/Makefile.am
@@ -2,7 +2,7 @@
##
## Process this file with automake to create Makefile.in
##
-## Copyright (C) 2005-2010 Red Hat, Inc.
+## Copyright (C) 2005-2010, 2013 Red Hat, Inc.
## This file is part of elfutils.
##
## This file is free software; you can redistribute it and/or modify
@@ -31,7 +31,7 @@
##
include $(top_srcdir)/config/eu.am
AM_CPPFLAGS += -I$(srcdir) -I$(srcdir)/../libelf -I$(srcdir)/../libebl \
- -I$(srcdir)/../libdw
+ -I$(srcdir)/../libdw -I$(srcdir)/../libasm
VERSION = 1
noinst_LIBRARIES = libdwfl.a
@@ -68,7 +68,9 @@ libdwfl_a_SOURCES = dwfl_begin.c dwfl_end.c dwfl_error.c dwfl_version.c \
dwfl_module_return_value_location.c \
dwfl_module_register_names.c \
dwfl_segment_report_module.c \
- link_map.c core-file.c open.c image-header.c
+ link_map.c core-file.c open.c image-header.c \
+ dwfl_frame.c dwfl_frame_unwind.c dwfl_frame_pc.c \
+ dwfl_frame_pid.c dwfl_frame_core.c dwfl_frame_regs.c
if ZLIB
libdwfl_a_SOURCES += gzip.c
--- a/libdwfl/core-file.c
+++ b/libdwfl/core-file.c
@@ -1,5 +1,5 @@
/* Core file handling.
- Copyright (C) 2008-2010 Red Hat, Inc.
+ Copyright (C) 2008-2010, 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -521,6 +521,14 @@ dwfl_core_file_report (Dwfl *dwfl, Elf *elf)
/* We return the number of modules we found if we found any.
If we found none, we return -1 instead of 0 if there was an
error rather than just nothing found. */
- return sniffed || listed >= 0 ? listed + sniffed : listed;
+ int retval = sniffed || listed >= 0 ? listed + sniffed : listed;
+ if (retval > 0)
+ {
+ /* Possible error is ignored, DWFL still may be useful for non-unwinding
+ operations. */
+ __libdwfl_attach_state_for_core (dwfl, elf);
+ }
+
+ return retval;
}
INTDEF (dwfl_core_file_report)
--- a/libdwfl/dwfl_end.c
+++ b/libdwfl/dwfl_end.c
@@ -1,5 +1,5 @@
/* Finish a session using libdwfl.
- Copyright (C) 2005, 2008, 2012 Red Hat, Inc.
+ Copyright (C) 2005, 2008, 2012-2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -34,6 +34,9 @@ dwfl_end (Dwfl *dwfl)
if (dwfl == NULL)
return;
+ if (dwfl->process)
+ __libdwfl_process_free (dwfl->process);
+
free (dwfl->lookup_addr);
free (dwfl->lookup_module);
free (dwfl->lookup_segndx);
--- /dev/null
+++ b/libdwfl/dwfl_frame.c
@@ -0,0 +1,357 @@
+/* Get Dwarf Frame state for target PID or core file.
+ Copyright (C) 2013 Red Hat, Inc.
+ 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/>. */
+
+#include "libdwflP.h"
+#include <sys/ptrace.h>
+#include <unistd.h>
+
+#ifndef MIN
+# define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+/* Set STATE->pc_set from STATE->regs according to the backend. Return true on
+ success, false on error. */
+static bool
+state_fetch_pc (Dwfl_Frame *state)
+{
+ switch (state->pc_state)
+ {
+ case DWFL_FRAME_STATE_PC_SET:
+ return true;
+ case DWFL_FRAME_STATE_PC_UNDEFINED:
+ abort ();
+ case DWFL_FRAME_STATE_ERROR:;
+ Ebl *ebl = state->thread->process->ebl;
+ Dwarf_CIE abi_info;
+ if (ebl_abi_cfi (ebl, &abi_info) != 0)
+ {
+ __libdwfl_seterrno (DWFL_E_LIBEBL);
+ return false;
+ }
+ unsigned ra = abi_info.return_address_register;
+ /* dwarf_frame_state_reg_is_set is not applied here. */
+ if (ra >= ebl_frame_nregs (ebl))
+ {
+ __libdwfl_seterrno (DWFL_E_LIBEBL_BAD);
+ return false;
+ }
+ state->pc = state->regs[ra];
+ state->pc_state = DWFL_FRAME_STATE_PC_SET;
+ return true;
+ }
+ abort ();
+}
+
+/* Do not call it on your own, to be used by thread_* functions only. */
+
+static void
+state_free (Dwfl_Frame *state)
+{
+ Dwfl_Thread *thread = state->thread;
+ assert (thread->unwound == state);
+ thread->unwound = state->unwound;
+ free (state);
+}
+
+/* Do not call it on your own, to be used by thread_* functions only. */
+
+static Dwfl_Frame *
+state_alloc (Dwfl_Thread *thread)
+{
+ assert (thread->unwound == NULL);
+ Ebl *ebl = thread->process->ebl;
+ size_t nregs = ebl_frame_nregs (ebl);
+ if (nregs == 0)
+ return NULL;
+ assert (nregs < sizeof (((Dwfl_Frame *) NULL)->regs_set) * 8);
+ Dwfl_Frame *state = malloc (sizeof (*state) + sizeof (*state->regs) * nregs);
+ if (state == NULL)
+ return NULL;
+ state->thread = thread;
+ state->signal_frame = false;
+ state->pc_state = DWFL_FRAME_STATE_ERROR;
+ memset (state->regs_set, 0, sizeof (state->regs_set));
+ thread->unwound = state;
+ state->unwound = NULL;
+ return state;
+}
+
+/* Free and unlink THREAD from the internal lists. PREV_THREAD must be NULL if
+ THREAD was the first one or PREV_THREAD must be the preceding thread. */
+static void
+thread_free (Dwfl_Thread *thread, Dwfl_Thread *prev_thread)
+{
+ Dwfl_Process *process = thread->process;
+ assert (prev_thread == NULL || prev_thread->process == process);
+ assert (prev_thread != NULL || process->thread == thread);
+ assert (prev_thread == NULL || prev_thread->next == thread);
+ if (thread->thread_detach_needed)
+ {
+ assert (thread->tid > 0);
+ if (process->callbacks->thread_detach)
+ process->callbacks->thread_detach (thread, thread->callbacks_arg);
+ }
+ while (thread->unwound)
+ state_free (thread->unwound);
+ if (prev_thread == NULL)
+ process->thread = thread->next;
+ else
+ prev_thread->next = thread->next;
+ free (thread);
+}
+
+/* Allocate new Dwfl_Thread and link it to PROCESS. PREV_THREAD must be NULL
+ if this is the first thread for PROCESS, otherwise PREV_THREAD must be the
+ last thread of PROCESS. */
+static Dwfl_Thread *
+thread_alloc (Dwfl_Process *process, Dwfl_Thread *prev_thread)
+{
+ assert (prev_thread == NULL || prev_thread->process == process);
+ assert (prev_thread != NULL || process->thread == NULL);
+ assert (prev_thread == NULL || prev_thread->next == NULL);
+ Dwfl_Thread *thread = malloc (sizeof (*thread));
+ if (thread == NULL)
+ return NULL;
+ thread->process = process;
+ thread->unwound = NULL;
+ thread->tid = 0;
+ thread->next = NULL;
+ if (prev_thread == NULL)
+ process->thread = thread;
+ else
+ prev_thread->next = thread;
+ return thread;
+}
+
+void
+internal_function
+__libdwfl_process_free (Dwfl_Process *process)
+{
+ Dwfl *dwfl = process->dwfl;
+ if (process->callbacks->detach != NULL)
+ process->callbacks->detach (dwfl, process->callbacks_arg);
+ while (process->thread)
+ thread_free (process->thread, NULL);
+ assert (dwfl->process == process);
+ dwfl->process = NULL;
+ free (process);
+}
+
+/* Allocate new Dwfl_Process for DWFL. */
+static void
+process_alloc (Dwfl *dwfl)
+{
+ Dwfl_Process *process = malloc (sizeof (*process));
+ if (process == NULL)
+ return;
+ process->dwfl = dwfl;
+ process->thread = NULL;
+ dwfl->process = process;
+}
+
+bool
+dwfl_attach_state (Dwfl *dwfl, Ebl *ebl, pid_t pid,
+ const Dwfl_Thread_Callbacks *thread_callbacks, void *arg)
+{
+ if (thread_callbacks == NULL || thread_callbacks->next_thread == NULL
+ || thread_callbacks->set_initial_registers == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_UNKNOWN_ERROR);
+ return false;
+ }
+ if (dwfl->process != NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_ATTACH_STATE_CONFLICT);
+ return false;
+ }
+ if (ebl == NULL)
+ {
+ for (Dwfl_Module *mod = dwfl->modulelist; mod != NULL; mod = mod->next)
+ {
+ Dwfl_Error error = __libdwfl_module_getebl (mod);
+ if (error != DWFL_E_NOERROR)
+ continue;
+ ebl = mod->ebl;
+ break;
+ }
+ if (ebl == NULL)
+ {
+ /* Not identified EBL from any of the modules. */
+ __libdwfl_seterrno (DWFL_E_PROCESS_NO_ARCH);
+ return false;
+ }
+ }
+ process_alloc (dwfl);
+ Dwfl_Process *process = dwfl->process;
+ if (process == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return false;
+ }
+ process->ebl = ebl;
+ process->pid = pid;
+ process->callbacks = thread_callbacks;
+ process->callbacks_arg = arg;
+ return true;
+}
+INTDEF(dwfl_attach_state)
+
+pid_t
+dwfl_pid (Dwfl *dwfl)
+{
+ if (dwfl->process == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NO_ATTACH_STATE);
+ return -1;
+ }
+ return dwfl->process->pid;
+}
+INTDEF(dwfl_pid)
+
+Dwfl *
+dwfl_thread_dwfl (Dwfl_Thread *thread)
+{
+ return thread->process->dwfl;
+}
+INTDEF(dwfl_thread_dwfl)
+
+pid_t
+dwfl_thread_tid (Dwfl_Thread *thread)
+{
+ return thread->tid;
+}
+INTDEF(dwfl_thread_tid)
+
+Dwfl_Thread *
+dwfl_frame_thread (Dwfl_Frame *state)
+{
+ return state->thread;
+}
+INTDEF(dwfl_frame_thread)
+
+Dwfl_Thread *
+dwfl_next_thread (Dwfl *dwfl, Dwfl_Thread *prev_thread)
+{
+ assert (prev_thread == NULL || prev_thread->process->dwfl == dwfl);
+ if (prev_thread != NULL && prev_thread->next != NULL)
+ return prev_thread->next;
+ Dwfl_Process *process = dwfl->process;
+ if (process == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NO_ATTACH_STATE);
+ return NULL;
+ }
+ Dwfl_Thread *nthread = thread_alloc (process, prev_thread);
+ if (nthread == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return NULL;
+ }
+ nthread->tid = process->callbacks->next_thread (dwfl, nthread,
+ process->callbacks_arg,
+ &nthread->callbacks_arg);
+ if (nthread->tid < 0)
+ {
+ thread_free (nthread, prev_thread);
+ __libdwfl_seterrno (DWFL_E_NEXT_THREAD_FAIL);
+ return NULL;
+ }
+ if (nthread->tid == 0)
+ {
+ thread_free (nthread, prev_thread);
+ __libdwfl_seterrno (DWFL_E_NOERROR);
+ return NULL;
+ }
+ return nthread;
+}
+INTDEF(dwfl_next_thread)
+
+int
+dwfl_thread_getframes (Dwfl_Thread *thread,
+ int (*callback) (Dwfl_Frame *state, void *arg),
+ void *arg)
+{
+ assert (thread->unwound == NULL);
+ if (state_alloc (thread) == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return -1;
+ }
+ Dwfl_Process *process = thread->process;
+ if (! process->callbacks->set_initial_registers (thread,
+ thread->callbacks_arg))
+ {
+ while (thread->unwound)
+ state_free (thread->unwound);
+ return -1;
+ }
+ thread->thread_detach_needed = true;
+ if (! state_fetch_pc (thread->unwound))
+ {
+ assert (thread->thread_detach_needed);
+ if (process->callbacks->thread_detach)
+ process->callbacks->thread_detach (thread, thread->callbacks_arg);
+ thread->thread_detach_needed = false;
+ while (thread->unwound)
+ state_free (thread->unwound);
+ return -1;
+ }
+
+ Dwfl_Frame *state = thread->unwound;
+ do
+ {
+ int err = callback (state, arg);
+ if (err != DWARF_CB_OK)
+ {
+ assert (thread->thread_detach_needed);
+ if (process->callbacks->thread_detach)
+ process->callbacks->thread_detach (thread, thread->callbacks_arg);
+ thread->thread_detach_needed = false;
+ while (thread->unwound)
+ state_free (thread->unwound);
+ return err;
+ }
+ __libdwfl_frame_unwind (state);
+ state = state->unwound;
+ }
+ while (state && state->pc_state == DWFL_FRAME_STATE_PC_SET);
+
+ Dwfl_Error err = dwfl_errno ();
+ assert (thread->thread_detach_needed);
+ if (process->callbacks->thread_detach)
+ process->callbacks->thread_detach (thread, thread->callbacks_arg);
+ thread->thread_detach_needed = false;
+ if (state == NULL || state->pc_state == DWFL_FRAME_STATE_ERROR)
+ {
+ __libdwfl_seterrno (err);
+ return -1;
+ }
+ assert (state->pc_state == DWFL_FRAME_STATE_PC_UNDEFINED);
+ return 0;
+}
+INTDEF(dwfl_thread_getframes)
--- /dev/null
+++ b/libdwfl/dwfl_frame_core.c
@@ -0,0 +1,369 @@
+/* Get Dwarf Frame state for target core file.
+ Copyright (C) 2013 Red Hat, Inc.
+ 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/>. */
+
+#include "libdwflP.h"
+#include <fcntl.h>
+#include "system.h"
+
+#ifndef MIN
+# define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+struct core_arg
+{
+ Elf *core;
+ Elf_Data *note_data;
+ size_t thread_note_offset;
+ Ebl *ebl;
+};
+
+struct thread_arg
+{
+ struct core_arg *core_arg;
+ size_t note_offset;
+};
+
+static bool
+core_memory_read (Dwfl *dwfl, Dwarf_Addr addr, Dwarf_Word *result,
+ void *dwfl_arg)
+{
+ Dwfl_Process *process = dwfl->process;
+ struct core_arg *core_arg = dwfl_arg;
+ Elf *core = core_arg->core;
+ assert (core != NULL);
+ static size_t phnum;
+ if (elf_getphdrnum (core, &phnum) < 0)
+ return false;
+ for (size_t cnt = 0; cnt < phnum; ++cnt)
+ {
+ GElf_Phdr phdr_mem, *phdr = gelf_getphdr (core, cnt, &phdr_mem);
+ if (phdr == NULL || phdr->p_type != PT_LOAD)
+ continue;
+ /* Bias is zero here, a core file itself has no bias. */
+ GElf_Addr start = __libdwfl_segment_start (dwfl, phdr->p_vaddr);
+ GElf_Addr end = __libdwfl_segment_end (dwfl,
+ phdr->p_vaddr + phdr->p_memsz);
+ unsigned bytes = process->ebl->class == ELFCLASS64 ? 8 : 4;
+ if (addr < start || addr + bytes > end)
+ continue;
+ Elf_Data *data;
+ data = elf_getdata_rawchunk (core, phdr->p_offset + addr - start,
+ bytes, ELF_T_ADDR);
+ if (data == NULL)
+ return false;
+ assert (data->d_size == bytes);
+ /* FIXME: Currently any arch supported for unwinding supports
+ unaligned access. */
+ if (bytes == 8)
+ *result = *(const uint64_t *) data->d_buf;
+ else
+ *result = *(const uint32_t *) data->d_buf;
+ return true;
+ }
+ return false;
+}
+
+static pid_t
+core_next_thread (Dwfl *dwfl __attribute__ ((unused)),
+ Dwfl_Thread *nthread __attribute__ ((unused)), void *dwfl_arg,
+ void **thread_argp)
+{
+ struct core_arg *core_arg = dwfl_arg;
+ Elf *core = core_arg->core;
+ GElf_Nhdr nhdr;
+ size_t name_offset;
+ size_t desc_offset;
+ Elf_Data *note_data = core_arg->note_data;
+ size_t offset;
+ while (offset = core_arg->thread_note_offset, offset < note_data->d_size
+ && (core_arg->thread_note_offset = gelf_getnote (note_data, offset,
+ &nhdr, &name_offset,
+ &desc_offset)) > 0)
+ {
+ /* Do not check NAME for now, help broken Linux kernels. */
+ const char *name = note_data->d_buf + name_offset;
+ const char *desc = note_data->d_buf + desc_offset;
+ GElf_Word regs_offset;
+ size_t nregloc;
+ const Ebl_Register_Location *reglocs;
+ size_t nitems;
+ const Ebl_Core_Item *items;
+ if (! ebl_core_note (core_arg->ebl, &nhdr, name,
+ ®s_offset, &nregloc, ®locs, &nitems, &items))
+ {
+ /* This note may be just not recognized, skip it. */
+ continue;
+ }
+ if (nhdr.n_type != NT_PRSTATUS)
+ continue;
+ const Ebl_Core_Item *item;
+ for (item = items; item < items + nitems; item++)
+ if (strcmp (item->name, "pid") == 0)
+ break;
+ if (item == items + nitems)
+ continue;
+ uint32_t val32 = *(const uint32_t *) (desc + item->offset);
+ val32 = (elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB
+ ? be32toh (val32) : le32toh (val32));
+ pid_t tid = (int32_t) val32;
+ eu_static_assert (sizeof val32 <= sizeof tid);
+ struct thread_arg *thread_arg = malloc (sizeof (*thread_arg));
+ if (thread_arg == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return 0;
+ }
+ thread_arg->core_arg = core_arg;
+ thread_arg->note_offset = offset;
+ *thread_argp = thread_arg;
+ return tid;
+ }
+ return 0;
+}
+
+static bool
+core_set_initial_registers (Dwfl_Thread *thread, void *thread_arg_voidp)
+{
+ struct thread_arg *thread_arg = thread_arg_voidp;
+ struct core_arg *core_arg = thread_arg->core_arg;
+ Elf *core = core_arg->core;
+ size_t offset = thread_arg->note_offset;
+ GElf_Nhdr nhdr;
+ size_t name_offset;
+ size_t desc_offset;
+ Elf_Data *note_data = core_arg->note_data;
+ size_t nregs = ebl_frame_nregs (core_arg->ebl);
+ assert (offset < note_data->d_size);
+ size_t getnote_err = gelf_getnote (note_data, offset, &nhdr, &name_offset,
+ &desc_offset);
+ assert (getnote_err != 0);
+ /* Do not check NAME for now, help broken Linux kernels. */
+ const char *name = note_data->d_buf + name_offset;
+ const char *desc = note_data->d_buf + desc_offset;
+ GElf_Word regs_offset;
+ size_t nregloc;
+ const Ebl_Register_Location *reglocs;
+ size_t nitems;
+ const Ebl_Core_Item *items;
+ int core_note_err = ebl_core_note (core_arg->ebl, &nhdr, name, ®s_offset,
+ &nregloc, ®locs, &nitems, &items);
+ assert (core_note_err != 0);
+ assert (nhdr.n_type == NT_PRSTATUS);
+ const Ebl_Core_Item *item;
+ for (item = items; item < items + nitems; item++)
+ if (strcmp (item->name, "pid") == 0)
+ break;
+ assert (item < items + nitems);
+ pid_t tid;
+ {
+ uint32_t val32 = *(const uint32_t *) (desc + item->offset);
+ val32 = (elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB
+ ? be32toh (val32) : le32toh (val32));
+ tid = (int32_t) val32;
+ eu_static_assert (sizeof val32 <= sizeof tid);
+ }
+ assert (tid == INTUSE(dwfl_thread_tid) (thread));
+ desc += regs_offset;
+ for (size_t regloci = 0; regloci < nregloc; regloci++)
+ {
+ const Ebl_Register_Location *regloc = reglocs + regloci;
+ if (regloc->regno >= nregs)
+ continue;
+ assert (regloc->bits == 32 || regloc->bits == 64);
+ const char *reg_desc = desc + regloc->offset;
+ for (unsigned regno = regloc->regno;
+ regno < MIN (regloc->regno + (regloc->count ?: 1U), nregs);
+ regno++)
+ {
+ /* PPC provides DWARF register 65 irrelevant for
+ CFI which clashes with register 108 (LR) we need.
+ LR (108) is provided earlier (in NT_PRSTATUS) than the # 65.
+ FIXME: It depends now on their order in core notes.
+ FIXME: It uses private function. */
+ if (dwfl_frame_reg_get (thread->unwound, regno, NULL))
+ continue;
+ Dwarf_Word val;
+ switch (regloc->bits)
+ {
+ case 32:;
+ uint32_t val32 = *(const uint32_t *) reg_desc;
+ reg_desc += sizeof val32;
+ val32 = (elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB
+ ? be32toh (val32) : le32toh (val32));
+ /* Do a host width conversion. */
+ val = val32;
+ break;
+ case 64:;
+ uint64_t val64 = *(const uint64_t *) reg_desc;
+ reg_desc += sizeof val64;
+ val64 = (elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB
+ ? be64toh (val64) : le64toh (val64));
+ assert (sizeof (*thread->unwound->regs) == sizeof val64);
+ val = val64;
+ break;
+ default:
+ abort ();
+ }
+ /* Registers not valid for CFI are just ignored. */
+ INTUSE(dwfl_thread_state_registers) (thread, regno, 1, &val);
+ reg_desc += regloc->pad;
+ }
+ }
+ return true;
+}
+
+static void
+core_detach (Dwfl *dwfl __attribute__ ((unused)), void *dwfl_arg)
+{
+ struct core_arg *core_arg = dwfl_arg;
+ ebl_closebackend (core_arg->ebl);
+ free (core_arg);
+}
+
+static const Dwfl_Thread_Callbacks core_thread_callbacks =
+{
+ core_next_thread,
+ core_memory_read,
+ core_set_initial_registers,
+ core_detach,
+ NULL, /* core_thread_detach */
+};
+
+bool
+internal_function
+__libdwfl_attach_state_for_core (Dwfl *dwfl, Elf *core)
+{
+ Ebl *ebl = ebl_openbackend (core);
+ if (ebl == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_LIBEBL);
+ return false;
+ }
+ size_t nregs = ebl_frame_nregs (ebl);
+ if (nregs == 0)
+ {
+ ebl_closebackend (ebl);
+ __libdwfl_seterrno (DWFL_E_LIBEBL);
+ return false;
+ }
+ GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (core, &ehdr_mem);
+ if (ehdr == NULL)
+ {
+ ebl_closebackend (ebl);
+ __libdwfl_seterrno (DWFL_E_LIBELF);
+ return false;
+ }
+ assert (ehdr->e_type == ET_CORE);
+ size_t phnum;
+ if (elf_getphdrnum (core, &phnum) < 0)
+ {
+ ebl_closebackend (ebl);
+ __libdwfl_seterrno (DWFL_E_LIBELF);
+ return false;
+ }
+ pid_t pid = -1;
+ Elf_Data *note_data = NULL;
+ for (size_t cnt = 0; cnt < phnum; ++cnt)
+ {
+ GElf_Phdr phdr_mem, *phdr = gelf_getphdr (core, cnt, &phdr_mem);
+ if (phdr != NULL && phdr->p_type == PT_NOTE)
+ {
+ note_data = elf_getdata_rawchunk (core, phdr->p_offset,
+ phdr->p_filesz, ELF_T_NHDR);
+ break;
+ }
+ }
+ if (note_data == NULL)
+ {
+ ebl_closebackend (ebl);
+ __libdwfl_seterrno (DWFL_E_LIBELF);
+ return NULL;
+ }
+ size_t offset = 0;
+ GElf_Nhdr nhdr;
+ size_t name_offset;
+ size_t desc_offset;
+ while (offset < note_data->d_size
+ && (offset = gelf_getnote (note_data, offset,
+ &nhdr, &name_offset, &desc_offset)) > 0)
+ {
+ /* Do not check NAME for now, help broken Linux kernels. */
+ const char *name = note_data->d_buf + name_offset;
+ const char *desc = note_data->d_buf + desc_offset;
+ GElf_Word regs_offset;
+ size_t nregloc;
+ const Ebl_Register_Location *reglocs;
+ size_t nitems;
+ const Ebl_Core_Item *items;
+ if (! ebl_core_note (ebl, &nhdr, name,
+ ®s_offset, &nregloc, ®locs, &nitems, &items))
+ {
+ /* This note may be just not recognized, skip it. */
+ continue;
+ }
+ if (nhdr.n_type != NT_PRPSINFO)
+ continue;
+ const Ebl_Core_Item *item;
+ for (item = items; item < items + nitems; item++)
+ if (strcmp (item->name, "pid") == 0)
+ break;
+ if (item == items + nitems)
+ continue;
+ uint32_t val32 = *(const uint32_t *) (desc + item->offset);
+ val32 = (elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB
+ ? be32toh (val32) : le32toh (val32));
+ pid = (int32_t) val32;
+ eu_static_assert (sizeof val32 <= sizeof pid);
+ break;
+ }
+ if (pid == -1)
+ {
+ /* No valid NT_PRPSINFO recognized in this CORE. */
+ ebl_closebackend (ebl);
+ __libdwfl_seterrno (DWFL_E_BADELF);
+ return false;
+ }
+ struct core_arg *core_arg = malloc (sizeof *core_arg);
+ if (core_arg == NULL)
+ {
+ ebl_closebackend (ebl);
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return false;
+ }
+ core_arg->core = core;
+ core_arg->note_data = note_data;
+ core_arg->thread_note_offset = 0;
+ core_arg->ebl = ebl;
+ if (! INTUSE(dwfl_attach_state) (dwfl, ebl, pid, &core_thread_callbacks, core_arg))
+ {
+ free (core_arg);
+ ebl_closebackend (ebl);
+ return false;
+ }
+ return true;
+}
--- /dev/null
+++ b/libdwfl/dwfl_frame_pc.c
@@ -0,0 +1,61 @@
+/* Get return address register value for frame.
+ Copyright (C) 2013 Red Hat, Inc.
+ 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 "libdwflP.h"
+
+bool
+dwfl_frame_pc (Dwfl_Frame *state, Dwarf_Addr *pc, bool *isactivation)
+{
+ assert (state->pc_state == DWFL_FRAME_STATE_PC_SET);
+ *pc = state->pc;
+ if (isactivation)
+ {
+ /* Bottom frame? */
+ if (state == state->thread->unwound)
+ *isactivation = true;
+ /* *ISACTIVATION is logical or of current and previous frame state. */
+ else if (state->signal_frame)
+ *isactivation = true;
+ else
+ {
+ /* Not affected by unsuccessfully unwound frame. */
+ __libdwfl_frame_unwind (state);
+ if (state->unwound == NULL
+ || state->unwound->pc_state != DWFL_FRAME_STATE_PC_SET)
+ *isactivation = false;
+ else
+ *isactivation = state->unwound->signal_frame;
+ }
+ }
+ return true;
+}
+INTDEF (dwfl_frame_pc)
--- /dev/null
+++ b/libdwfl/dwfl_frame_pid.c
@@ -0,0 +1,231 @@
+/* Get Dwarf Frame state for target live PID process.
+ Copyright (C) 2013 Red Hat, Inc.
+ 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/>. */
+
+#include "libdwflP.h"
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <dirent.h>
+
+#ifndef MAX
+# define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
+struct pid_arg
+{
+ DIR *dir;
+ size_t tids_attached_size, tids_attached_used;
+ pid_t *tids_attached;
+};
+
+static bool
+ptrace_attach (pid_t tid)
+{
+ if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0)
+ return false;
+ /* FIXME: Handle missing SIGSTOP on old Linux kernels. */
+ for (;;)
+ {
+ int status;
+ if (waitpid (tid, &status, __WALL) != tid || !WIFSTOPPED (status))
+ {
+ ptrace (PTRACE_DETACH, tid, NULL, NULL);
+ return false;
+ }
+ if (WSTOPSIG (status) == SIGSTOP)
+ break;
+ if (ptrace (PTRACE_CONT, tid, NULL,
+ (void *) (uintptr_t) WSTOPSIG (status)) != 0)
+ {
+ ptrace (PTRACE_DETACH, tid, NULL, NULL);
+ return false;
+ }
+ }
+ return true;
+}
+
+static bool
+pid_memory_read (Dwfl *dwfl, Dwarf_Addr addr, Dwarf_Word *result, void *arg)
+{
+ struct pid_arg *pid_arg = arg;
+ assert (pid_arg->tids_attached_used > 0);
+ pid_t tid = pid_arg->tids_attached[0];
+ Dwfl_Process *process = dwfl->process;
+ if (process->ebl->class == ELFCLASS64)
+ {
+ errno = 0;
+ *result = ptrace (PTRACE_PEEKDATA, tid, (void *) (uintptr_t) addr, NULL);
+ return errno == 0;
+ }
+#if SIZEOF_LONG == 8
+ /* We do not care about reads unaliged to 4 bytes boundary.
+ But 0x...ffc read of 8 bytes could overrun a page. */
+ bool lowered = (addr & 4) != 0;
+ if (lowered)
+ addr -= 4;
+#endif /* SIZEOF_LONG == 8 */
+ errno = 0;
+ *result = ptrace (PTRACE_PEEKDATA, tid, (void *) (uintptr_t) addr, NULL);
+ if (errno != 0)
+ return false;
+#if SIZEOF_LONG == 8
+# if BYTE_ORDER == BIG_ENDIAN
+ if (! lowered)
+ *result >>= 32;
+# else
+ if (lowered)
+ *result >>= 32;
+# endif
+#endif /* SIZEOF_LONG == 8 */
+ *result &= 0xffffffff;
+ return true;
+}
+
+static pid_t
+pid_next_thread (Dwfl *dwfl __attribute__ ((unused)),
+ Dwfl_Thread *nthread __attribute__ ((unused)), void *dwfl_arg,
+ void **thread_argp)
+{
+ struct pid_arg *pid_arg = dwfl_arg;
+ struct dirent *dirent;
+ do
+ {
+ errno = 0;
+ dirent = readdir (pid_arg->dir);
+ if (dirent == NULL)
+ return errno == 0 ? 0 : -1;
+ }
+ while (strcmp (dirent->d_name, ".") == 0
+ || strcmp (dirent->d_name, "..") == 0);
+ char *end;
+ errno = 0;
+ long tidl = strtol (dirent->d_name, &end, 10);
+ if (errno != 0)
+ return -1;
+ pid_t tid = tidl;
+ if (tidl <= 0 || (end && *end) || tid != tidl)
+ return -1;
+ *thread_argp = dwfl_arg;
+ return tid;
+}
+
+static bool
+pid_thread_state_registers_cb (const int firstreg,
+ unsigned nregs,
+ const Dwarf_Word *regs,
+ void *arg)
+{
+ Dwfl_Thread *thread = (Dwfl_Thread *) arg;
+ return INTUSE(dwfl_thread_state_registers) (thread, firstreg, nregs, regs);
+}
+
+static bool
+pid_set_initial_registers (Dwfl_Thread *thread, void *thread_arg)
+{
+ struct pid_arg *pid_arg = thread_arg;
+ pid_t tid = INTUSE(dwfl_thread_tid) (thread);
+ if (! ptrace_attach (tid))
+ return false;
+ if (pid_arg->tids_attached_used == pid_arg->tids_attached_size)
+ {
+ pid_arg->tids_attached_size *= 2;
+ pid_arg->tids_attached_size = MAX (64, pid_arg->tids_attached_size);
+ pid_arg->tids_attached = realloc (pid_arg->tids_attached,
+ (pid_arg->tids_attached_size
+ * sizeof *pid_arg->tids_attached));
+ }
+ pid_arg->tids_attached[pid_arg->tids_attached_used++] = tid;
+ Dwfl_Process *process = thread->process;
+ Ebl *ebl = process->ebl;
+ return ebl_set_initial_registers_tid (ebl, tid,
+ pid_thread_state_registers_cb, thread);
+}
+
+static void
+pid_detach (Dwfl *dwfl __attribute__ ((unused)), void *dwfl_arg)
+{
+ struct pid_arg *pid_arg = dwfl_arg;
+ closedir (pid_arg->dir);
+ free (pid_arg->tids_attached);
+ free (pid_arg);
+}
+
+static void
+pid_thread_detach (Dwfl_Thread *thread, void *thread_arg)
+{
+ struct pid_arg *pid_arg = thread_arg;
+ pid_t tid = INTUSE(dwfl_thread_tid) (thread);
+ size_t ix;
+ for (ix = 0; ix < pid_arg->tids_attached_used; ix++)
+ if (pid_arg->tids_attached[ix] == tid)
+ break;
+ assert (ix < pid_arg->tids_attached_used);
+ pid_arg->tids_attached[ix]
+ = pid_arg->tids_attached[--pid_arg->tids_attached_used];
+ ptrace (PTRACE_DETACH, tid, NULL, NULL);
+}
+
+static const Dwfl_Thread_Callbacks pid_thread_callbacks =
+{
+ pid_next_thread,
+ pid_memory_read,
+ pid_set_initial_registers,
+ pid_detach,
+ pid_thread_detach,
+};
+
+bool
+internal_function
+__libdwfl_attach_state_for_pid (Dwfl *dwfl, pid_t pid)
+{
+ char dirname[64];
+ int i = snprintf (dirname, sizeof (dirname), "/proc/%ld/task", (long) pid);
+ assert (i > 0 && i < (ssize_t) sizeof (dirname) - 1);
+ DIR *dir = opendir (dirname);
+ if (dir == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_PARSE_PROC);
+ return NULL;
+ }
+ struct pid_arg *pid_arg = malloc (sizeof *pid_arg);
+ if (pid_arg == NULL)
+ {
+ closedir (dir);
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return false;
+ }
+ pid_arg->dir = dir;
+ pid_arg->tids_attached_size = 0;
+ pid_arg->tids_attached_used = 0;
+ pid_arg->tids_attached = NULL;
+ if (! INTUSE(dwfl_attach_state) (dwfl, NULL, pid, &pid_thread_callbacks, pid_arg))
+ {
+ free (pid_arg);
+ return false;
+ }
+ return true;
+}
--- /dev/null
+++ b/libdwfl/dwfl_frame_regs.c
@@ -0,0 +1,55 @@
+/* Get Dwarf Frame state from modules present in DWFL.
+ Copyright (C) 2013 Red Hat, Inc.
+ 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/>. */
+
+#include "libdwflP.h"
+
+bool
+dwfl_thread_state_registers (Dwfl_Thread *thread, const int firstreg,
+ unsigned nregs, const Dwarf_Word *regs)
+{
+ Dwfl_Frame *state = thread->unwound;
+ assert (state && state->unwound == NULL);
+ for (unsigned regno = firstreg; regno < firstreg + nregs; regno++)
+ if (! dwfl_frame_reg_set (state, regno, regs[regno - firstreg]))
+ {
+ __libdwfl_seterrno (DWFL_E_INVALID_REGISTER);
+ return false;
+ }
+ return true;
+}
+INTDEF(dwfl_thread_state_registers)
+
+void
+dwfl_thread_state_register_pc (Dwfl_Thread *thread, Dwarf_Word pc)
+{
+ Dwfl_Frame *state = thread->unwound;
+ assert (state && state->unwound == NULL);
+ state->pc = pc;
+ state->pc_state = DWFL_FRAME_STATE_PC_SET;
+}
+INTDEF(dwfl_thread_state_register_pc)
--- /dev/null
+++ b/libdwfl/dwfl_frame_unwind.c
@@ -0,0 +1,416 @@
+/* Get previous frame state for an existing frame state.
+ Copyright (C) 2013 Red Hat, Inc.
+ 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 "cfi.h"
+#include <stdlib.h>
+#include "libdwflP.h"
+#include "../libdw/dwarf.h"
+#include <sys/ptrace.h>
+
+#ifndef MAX
+# define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
+static bool
+state_get_reg (Dwfl_Frame *state, unsigned regno, Dwarf_Addr *val)
+{
+ if (! dwfl_frame_reg_get (state, regno, val))
+ {
+ __libdwfl_seterrno (DWFL_E_INVALID_REGISTER);
+ return false;
+ }
+ return true;
+}
+
+static int
+bra_compar (const void *key_voidp, const void *elem_voidp)
+{
+ Dwarf_Word offset = (uintptr_t) key_voidp;
+ const Dwarf_Op *op = elem_voidp;
+ return (offset > op->offset) - (offset < op->offset);
+}
+
+/* FIXME: Handle bytecode deadlocks and overflows. */
+
+static bool
+expr_eval (Dwfl_Frame *state, Dwarf_Frame *frame, const Dwarf_Op *ops,
+ size_t nops, Dwarf_Addr *result)
+{
+ Dwfl_Process *process = state->thread->process;
+ if (nops == 0)
+ {
+ __libdwfl_seterrno (DWFL_E_INVALID_DWARF);
+ return false;
+ }
+ Dwarf_Addr *stack = NULL;
+ size_t stack_used = 0, stack_allocated = 0;
+ bool
+ push (Dwarf_Addr val)
+ {
+ if (stack_used == stack_allocated)
+ {
+ stack_allocated = MAX (stack_allocated * 2, 32);
+ Dwarf_Addr *stack_new = realloc (stack, stack_allocated * sizeof (*stack));
+ if (stack_new == NULL)
+ {
+ __libdwfl_seterrno (DWFL_E_NOMEM);
+ return false;
+ }
+ stack = stack_new;
+ }
+ stack[stack_used++] = val;
+ return true;
+ }
+ bool
+ pop (Dwarf_Addr *val)
+ {
+ if (stack_used == 0)
+ {
+ __libdwfl_seterrno (DWFL_E_INVALID_DWARF);
+ return false;
+ }
+ *val = stack[--stack_used];
+ return true;
+ }
+ Dwarf_Addr val1, val2;
+ bool is_location = false;
+ for (const Dwarf_Op *op = ops; op < ops + nops; op++)
+ switch (op->atom)
+ {
+ case DW_OP_reg0 ... DW_OP_reg31:
+ if (! state_get_reg (state, op->atom - DW_OP_reg0, &val1)
+ || ! push (val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_regx:
+ if (! state_get_reg (state, op->number, &val1) || ! push (val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_breg0 ... DW_OP_breg31:
+ if (! state_get_reg (state, op->atom - DW_OP_breg0, &val1))
+ {
+ free (stack);
+ return false;
+ }
+ val1 += op->number;
+ if (! push (val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_bregx:
+ if (! state_get_reg (state, op->number, &val1))
+ {
+ free (stack);
+ return false;
+ }
+ val1 += op->number2;
+ if (! push (val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_lit0 ... DW_OP_lit31:
+ if (! push (op->atom - DW_OP_lit0))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_plus_uconst:
+ if (! pop (&val1) || ! push (val1 + op->number))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_call_frame_cfa:;
+ Dwarf_Op *cfa_ops;
+ size_t cfa_nops;
+ Dwarf_Addr cfa;
+ if (dwarf_frame_cfa (frame, &cfa_ops, &cfa_nops) != 0
+ || ! expr_eval (state, frame, cfa_ops, cfa_nops, &cfa)
+ || ! push (cfa))
+ {
+ __libdwfl_seterrno (DWFL_E_LIBDW);
+ free (stack);
+ return false;
+ }
+ is_location = true;
+ break;
+ case DW_OP_stack_value:
+ is_location = false;
+ break;
+ case DW_OP_deref:
+ if (! pop (&val1)
+ || process->callbacks->memory_read == NULL
+ || ! process->callbacks->memory_read (process->dwfl, val1, &val1,
+ process->callbacks_arg)
+ || ! push (val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_nop:
+ break;
+ case DW_OP_dup:
+ if (! pop (&val1) || ! push (val1) || ! push (val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_const1u:
+ case DW_OP_const1s:
+ case DW_OP_const2u:
+ case DW_OP_const2s:
+ case DW_OP_const4u:
+ case DW_OP_const4s:
+ case DW_OP_const8u:
+ case DW_OP_const8s:
+ case DW_OP_constu:
+ case DW_OP_consts:
+ if (! push (op->number))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+ case DW_OP_bra:
+ if (! pop (&val1))
+ {
+ free (stack);
+ return false;
+ }
+ if (val1 == 0)
+ break;
+ /* FALLTHRU */
+ case DW_OP_skip:;
+ Dwarf_Word offset = op->offset + 1 + 2 + (int16_t) op->number;
+ const Dwarf_Op *found = bsearch ((void *) (uintptr_t) offset, ops, nops,
+ sizeof (*ops), bra_compar);
+ if (found == NULL)
+ {
+ free (stack);
+ /* PPC32 vDSO has such invalid operations. */
+ __libdwfl_seterrno (DWFL_E_INVALID_DWARF);
+ return false;
+ }
+ /* Undo the 'for' statement increment. */
+ op = found - 1;
+ break;
+ case DW_OP_drop:
+ if (! pop (&val1))
+ {
+ free (stack);
+ return false;
+ }
+ break;
+#define BINOP(atom, op) \
+ case atom: \
+ if (! pop (&val2) || ! pop (&val1) || ! push (val1 op val2)) \
+ { \
+ free (stack); \
+ return false; \
+ } \
+ break;
+ BINOP (DW_OP_and, &)
+ BINOP (DW_OP_shl, <<)
+ BINOP (DW_OP_plus, +)
+ BINOP (DW_OP_mul, *)
+#undef BINOP
+#define BINOP_SIGNED(atom, op) \
+ case atom: \
+ if (! pop (&val2) || ! pop (&val1) \
+ || ! push ((int64_t) val1 op (int64_t) val2)) \
+ { \
+ free (stack); \
+ return false; \
+ } \
+ break;
+ BINOP_SIGNED (DW_OP_le, <=)
+ BINOP_SIGNED (DW_OP_ge, >=)
+ BINOP_SIGNED (DW_OP_eq, ==)
+ BINOP_SIGNED (DW_OP_lt, <)
+ BINOP_SIGNED (DW_OP_gt, >)
+ BINOP_SIGNED (DW_OP_ne, !=)
+#undef BINOP_SIGNED
+ default:
+ __libdwfl_seterrno (DWFL_E_UNSUPPORTED_DWARF);
+ return false;
+ }
+ if (! pop (result))
+ {
+ free (stack);
+ return false;
+ }
+ free (stack);
+ if (is_location
+ && (process->callbacks->memory_read == NULL
+ || ! process->callbacks->memory_read (process->dwfl, *result, result,
+ process->callbacks_arg)))
+ return false;
+ return true;
+}
+
+/* The logic is to call __libdwfl_seterrno for any CFI bytecode interpretation
+ error so one can easily catch the problem with a debugger. Still there are
+ archs with invalid CFI for some registers where the registers are never used
+ later. Therefore we continue unwinding leaving the registers undefined.
+
+ The only exception is PC itself, when there is an error unwinding PC we
+ return false. Otherwise we would return successful end of backtrace seeing
+ an undefined PC register (due to an error unwinding it). */
+
+static void
+handle_cfi (Dwfl_Frame *state, Dwarf_Addr pc, Dwarf_CFI *cfi)
+{
+ Dwarf_Frame *frame;
+ if (INTUSE(dwarf_cfi_addrframe) (cfi, pc, &frame) != 0)
+ {
+ __libdwfl_seterrno (DWFL_E_LIBDW);
+ return;
+ }
+ Dwfl_Thread *thread = state->thread;
+ Dwfl_Process *process = thread->process;
+ Ebl *ebl = process->ebl;
+ size_t nregs = ebl_frame_nregs (ebl);
+ Dwfl_Frame *unwound;
+ unwound = malloc (sizeof (*unwound) + sizeof (*unwound->regs) * nregs);
+ state->unwound = unwound;
+ unwound->thread = thread;
+ unwound->unwound = NULL;
+ unwound->signal_frame = frame->fde->cie->signal_frame;
+ unwound->pc_state = DWFL_FRAME_STATE_ERROR;
+ memset (unwound->regs_set, 0, sizeof (unwound->regs_set));
+ for (unsigned regno = 0; regno < nregs; regno++)
+ {
+ Dwarf_Op reg_ops_mem[3], *reg_ops;
+ size_t reg_nops;
+ if (dwarf_frame_register (frame, regno, reg_ops_mem, ®_ops,
+ ®_nops) != 0)
+ {
+ __libdwfl_seterrno (DWFL_E_LIBDW);
+ continue;
+ }
+ Dwarf_Addr regval;
+ if (reg_nops == 0)
+ {
+ if (reg_ops == reg_ops_mem)
+ {
+ /* REGNO is undefined. */
+ unsigned ra = frame->fde->cie->return_address_register;
+ if (regno == ra)
+ unwound->pc_state = DWFL_FRAME_STATE_PC_UNDEFINED;
+ continue;
+ }
+ else if (reg_ops == NULL)
+ {
+ /* REGNO is same-value. */
+ if (! state_get_reg (state, regno, ®val))
+ continue;
+ }
+ else
+ {
+ __libdwfl_seterrno (DWFL_E_INVALID_DWARF);
+ continue;
+ }
+ }
+ else if (! expr_eval (state, frame, reg_ops, reg_nops, ®val))
+ {
+ /* PPC32 vDSO has various invalid operations, ignore them. The
+ register will look as unset causing an error later, if used.
+ But PPC32 does not use such registers. */
+ continue;
+ }
+ if (! dwfl_frame_reg_set (unwound, regno, regval))
+ {
+ __libdwfl_seterrno (DWFL_E_INVALID_REGISTER);
+ continue;
+ }
+ }
+ if (unwound->pc_state == DWFL_FRAME_STATE_ERROR
+ && dwfl_frame_reg_get (unwound, frame->fde->cie->return_address_register,
+ &unwound->pc))
+ {
+ /* PPC32 __libc_start_main properly CFI-unwinds PC as zero. Currently
+ none of the archs supported for unwinding have zero as a valid PC. */
+ if (unwound->pc == 0)
+ unwound->pc_state = DWFL_FRAME_STATE_PC_UNDEFINED;
+ else
+ unwound->pc_state = DWFL_FRAME_STATE_PC_SET;
+ }
+}
+
+void
+internal_function
+__libdwfl_frame_unwind (Dwfl_Frame *state)
+{
+ if (state->unwound)
+ return;
+ Dwarf_Addr pc;
+ bool ok = INTUSE(dwfl_frame_pc) (state, &pc, NULL);
+ assert (ok);
+ /* Do not ask dwfl_frame_pc for ISACTIVATION, it would try to unwind STATE
+ which would deadlock us. */
+ if (state != state->thread->unwound && ! state->signal_frame)
+ pc--;
+ Dwfl_Module *mod = INTUSE(dwfl_addrmodule) (state->thread->process->dwfl, pc);
+ if (mod != NULL)
+ {
+ Dwarf_Addr bias;
+ Dwarf_CFI *cfi_eh = INTUSE(dwfl_module_eh_cfi) (mod, &bias);
+ if (cfi_eh)
+ {
+ handle_cfi (state, pc - bias, cfi_eh);
+ if (state->unwound)
+ return;
+ }
+ Dwarf_CFI *cfi_dwarf = INTUSE(dwfl_module_dwarf_cfi) (mod, &bias);
+ if (cfi_dwarf)
+ {
+ handle_cfi (state, pc - bias, cfi_dwarf);
+ if (state->unwound)
+ return;
+ }
+ }
+ __libdwfl_seterrno (DWFL_E_NO_DWARF);
+}
--- a/libdwfl/libdwfl.h
+++ b/libdwfl/libdwfl.h
@@ -1,5 +1,5 @@
/* Interfaces for libdwfl.
- Copyright (C) 2005-2010 Red Hat, Inc.
+ Copyright (C) 2005-2010, 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -41,6 +41,14 @@ typedef struct Dwfl_Module Dwfl_Module;
/* Handle describing a line record. */
typedef struct Dwfl_Line Dwfl_Line;
+/* This holds information common for all the frames of one backtrace for
+ a partical thread/task/TID. Several threads belong to one Dwfl. */
+typedef struct Dwfl_Thread Dwfl_Thread;
+
+/* This holds everything we know about the state of the frame at a particular
+ PC location described by an FDE belonging to Dwfl_Thread. */
+typedef struct Dwfl_Frame Dwfl_Frame;
+
/* Callbacks. */
typedef struct
{
@@ -352,10 +360,14 @@ extern int dwfl_linux_kernel_report_offline (Dwfl *dwfl, const char *release,
segment to locate its PT_DYNAMIC in the dump. This might call
dwfl_report_elf on file names found in the dump if reading some
link_map files is the only way to ascertain those modules' addresses.
+ dwfl_attach_state is also called for DWFL, dwfl_core_file_report does
+ not fail if the dwfl_attach_state call has failed.
Returns the number of modules reported, or -1 for errors. */
extern int dwfl_core_file_report (Dwfl *dwfl, Elf *elf);
/* Call dwfl_report_module for each file mapped into the address space of PID.
+ dwfl_attach_state is also called for DWFL, dwfl_linux_proc_report does
+ not fail if the dwfl_attach_state call has failed.
Returns zero on success, -1 if dwfl_report_module failed,
or an errno code if opening the kernel binary failed. */
extern int dwfl_linux_proc_report (Dwfl *dwfl, pid_t pid);
@@ -565,6 +577,119 @@ extern Dwarf_CFI *dwfl_module_dwarf_cfi (Dwfl_Module *mod, Dwarf_Addr *bias);
extern Dwarf_CFI *dwfl_module_eh_cfi (Dwfl_Module *mod, Dwarf_Addr *bias);
+typedef struct
+{
+ /* Called to iterate through threads. Returns next TID (thread ID) on
+ success, a negative number on failure and zero if there are no more
+ threads. NTHREAD is the new thread being created. *THREAD_ARGP may be
+ optionally set by the implementation, THREAD_ARGP is never NULL.
+ This method must not be NULL. */
+ pid_t (*next_thread) (Dwfl *dwfl, Dwfl_Thread *nthread, void *dwfl_arg,
+ void **thread_argp)
+ __nonnull_attribute__ (1, 2);
+
+ /* Called during unwinding to access memory (stack) state. Returns true for
+ successfully read *RESULT or false and sets dwfl_errno () on failure.
+ This method may be NULL - in such case dwfl_thread_getframes will return
+ only the initial frame. */
+ bool (*memory_read) (Dwfl *dwfl, Dwarf_Addr addr, Dwarf_Word *result,
+ void *dwfl_arg)
+ __nonnull_attribute__ (1, 3);
+
+ /* Called on initial unwind to get the initial register state of the first
+ frame. Should call dwfl_thread_state_registers, possibly multiple times
+ for different ranges and possibly also dwfl_thread_state_register_pc, to
+ fill in initial (DWARF) register values. After this call, till at least
+ thread_detach is called, the thread is assumed to be frozen, so that it is
+ safe to unwind. Returns true on success or false and sets dwfl_err () on
+ failure. This method must not be NULL. */
+ bool (*set_initial_registers) (Dwfl_Thread *thread, void *thread_arg)
+ __nonnull_attribute__ (1);
+
+ /* Called by dwfl_end. All thread_detach method calls have been already
+ done. This method may be NULL. */
+ void (*detach) (Dwfl *dwfl, void *dwfl_arg)
+ __nonnull_attribute__ (1);
+
+ /* Called when unwinding is done. No callback will be called after
+ this method has been called. Iff set_initial_registers was called for
+ a TID thread_detach will be called before the detach method above.
+ This method may be NULL. */
+ void (*thread_detach) (Dwfl_Thread *thread, void *thread_arg)
+ __nonnull_attribute__ (1);
+} Dwfl_Thread_Callbacks;
+
+/* PID is the process id associated with the DWFL state. Architecture of DWFL
+ modules is specified by EBL. If EBL is NULL the function will detect it
+ from arbitrary Dwfl_Module of DWFL. DWFL_ARG is the callback backend state.
+ DWFL_ARG will be provided to the callbacks. *THREAD_CALLBACKS function
+ pointers must remain valid during lifetime of DWFL. Function returns true
+ on success, false otherwise. */
+struct ebl;
+bool dwfl_attach_state (Dwfl *dwfl, struct ebl *ebl, pid_t pid,
+ const Dwfl_Thread_Callbacks *thread_callbacks,
+ void *dwfl_arg)
+ __nonnull_attribute__ (1, 4);
+
+/* Return PID for the process associated with DWFL. Function returns -1 if
+ dwfl_attach_state was not called for DWFL. */
+pid_t dwfl_pid (Dwfl *dwfl)
+ __nonnull_attribute__ (1);
+
+/* Return DWFL from which THREAD was created using dwfl_next_thread. */
+Dwfl *dwfl_thread_dwfl (Dwfl_Thread *thread)
+ __nonnull_attribute__ (1);
+
+/* Return positive TID (thread ID) for THREAD. This function never fails. */
+pid_t dwfl_thread_tid (Dwfl_Thread *thread)
+ __nonnull_attribute__ (1);
+
+/* Return thread for frame STATE. This function never fails. */
+Dwfl_Thread *dwfl_frame_thread (Dwfl_Frame *state)
+ __nonnull_attribute__ (1);
+
+/* Called by Dwfl_Thread_Callbacks.set_initial_registers implementation.
+ For every known continuous block of registers <FIRSTREG..FIRSTREG+NREGS)
+ (inclusive..exclusive) set their content to REGS (array of NREGS items).
+ Function returns false if any of the registers has invalid number. */
+bool dwfl_thread_state_registers (Dwfl_Thread *thread, const int firstreg,
+ unsigned nregs, const Dwarf_Word *regs)
+ __nonnull_attribute__ (1, 4);
+
+/* Called by Dwfl_Thread_Callbacks.set_initial_registers implementation.
+ If PC is not contained among DWARF registers passed by
+ dwfl_thread_state_registers on the target architecture pass the PC value
+ here. */
+void dwfl_thread_state_register_pc (Dwfl_Thread *thread, Dwarf_Word pc)
+ __nonnull_attribute__ (1);
+
+/* Gets the next known thread, if any. To get the initial thread
+ provide NULL as previous thread PREV_THREAD. On error function returns NULL
+ and sets dwfl_errno (). When no more threads are found function returns
+ NULL and dwfl_errno () is set to 0 - dwfl_errmsg (0) returns NULL then. */
+Dwfl_Thread *dwfl_next_thread (Dwfl *dwfl, Dwfl_Thread *prev_thread)
+ __nonnull_attribute__ (1);
+
+/* Iterate through the frames for a thread. Returns zero if all frames
+ have been processed by the callback, returns -1 on error, or the
+ value of the callback when not DWARF_CB_OK. Keeps calling the
+ callback with the next frame while the callback returns
+ DWARF_CB_OK, till there are no more frames. On start will call the
+ set_initial_registers callback and on return will call the
+ detach_thread callback of the Dwfl_Thread. */
+int dwfl_thread_getframes (Dwfl_Thread *thread,
+ int (*callback) (Dwfl_Frame *state, void *arg),
+ void *arg)
+ __nonnull_attribute__ (1, 2);
+
+/* Return *PC (program counter) for thread-specific frame STATE.
+ Set *ISACTIVATION according to DWARF frame "activation" definition.
+ Typically you need to substract 1 from *PC if *ACTIVATION is false to safely
+ find function of the caller. ACTIVATION may be NULL. PC must not be NULL.
+ Function returns false if it failed to find *PC. */
+bool dwfl_frame_pc (Dwfl_Frame *state, Dwarf_Addr *pc, bool *isactivation)
+ __nonnull_attribute__ (1, 2);
+
#ifdef __cplusplus
}
#endif
--- a/libdwfl/libdwflP.h
+++ b/libdwfl/libdwflP.h
@@ -1,5 +1,5 @@
/* Internal definitions for libdwfl.
- Copyright (C) 2005-2012 Red Hat, Inc.
+ Copyright (C) 2005-2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -41,6 +41,9 @@
#include <string.h>
#include "../libdw/libdwP.h" /* We need its INTDECLs. */
+#include "libeblP.h"
+
+typedef struct Dwfl_Process Dwfl_Process;
/* gettext helper macros. */
#define _(Str) dgettext ("elfutils", Str)
@@ -74,7 +77,19 @@
DWFL_ERROR (BADELF, N_("not a valid ELF file")) \
DWFL_ERROR (WEIRD_TYPE, N_("cannot handle DWARF type description")) \
DWFL_ERROR (WRONG_ID_ELF, N_("ELF file does not match build ID")) \
- DWFL_ERROR (BAD_PRELINK, N_("corrupt .gnu.prelink_undo section data"))
+ DWFL_ERROR (BAD_PRELINK, N_("corrupt .gnu.prelink_undo section data")) \
+ DWFL_ERROR (LIBEBL_BAD, N_("Internal error due to ebl")) \
+ DWFL_ERROR (CORE_MISSING, N_("Missing data in core file")) \
+ DWFL_ERROR (INVALID_REGISTER, N_("Invalid register")) \
+ DWFL_ERROR (PROCESS_MEMORY_READ, N_("Error reading process memory")) \
+ DWFL_ERROR (PROCESS_NO_ARCH, N_("Have not found ELF module in a process")) \
+ DWFL_ERROR (PARSE_PROC, N_("Error parsing /proc filesystem")) \
+ DWFL_ERROR (NO_THREAD, N_("No thread found")) \
+ DWFL_ERROR (INVALID_DWARF, N_("Invalid DWARF")) \
+ DWFL_ERROR (UNSUPPORTED_DWARF, N_("Unsupported DWARF")) \
+ DWFL_ERROR (NEXT_THREAD_FAIL, N_("Unable to find more threads")) \
+ DWFL_ERROR (ATTACH_STATE_CONFLICT, N_("Dwfl already has attached state")) \
+ DWFL_ERROR (NO_ATTACH_STATE, N_("Dwfl has no attached state"))
#define DWFL_ERROR(name, text) DWFL_E_##name,
typedef enum { DWFL_ERRORS DWFL_E_NUM } Dwfl_Error;
@@ -92,6 +107,8 @@ struct Dwfl
Dwfl_Module *modulelist; /* List in order used by full traversals. */
+ Dwfl_Process *process;
+
GElf_Addr offline_next_address;
GElf_Addr segment_align; /* Smallest granularity of segments. */
@@ -189,7 +206,94 @@ struct Dwfl_Module
bool gc; /* Mark/sweep flag. */
};
+/* This holds information common for all the threads/tasks/TIDs of one process
+ for backtraces. */
+
+struct Dwfl_Process
+{
+ struct Dwfl *dwfl;
+ pid_t pid;
+ const Dwfl_Thread_Callbacks *callbacks;
+ void *callbacks_arg;
+ struct ebl *ebl;
+ Dwfl_Thread *thread;
+};
+
+/* See its typedef in libdwfl.h. */
+
+struct Dwfl_Thread
+{
+ Dwfl_Process *process;
+ Dwfl_Thread *next;
+ pid_t tid;
+ bool thread_detach_needed : 1;
+ /* Bottom frame. */
+ Dwfl_Frame *unwound;
+ void *callbacks_arg;
+};
+
+/* See its typedef in libdwfl.h. */
+
+struct Dwfl_Frame
+{
+ Dwfl_Thread *thread;
+ /* Previous (outer) frame. */
+ Dwfl_Frame *unwound;
+ bool signal_frame : 1;
+ enum
+ {
+ /* This structure is still being initialized or there was an error
+ initializing it. */
+ DWFL_FRAME_STATE_ERROR,
+ /* PC field is valid. */
+ DWFL_FRAME_STATE_PC_SET,
+ /* PC field is undefined, this means the next (inner) frame was the
+ outermost frame. */
+ DWFL_FRAME_STATE_PC_UNDEFINED
+ } pc_state;
+ /* Either initialized from appropriate REGS element or on some archs
+ initialized separately as the return address has no DWARF register. */
+ Dwarf_Addr pc;
+ /* (1 << X) bitmask where 0 <= X < ebl_frame_nregs. */
+ uint64_t regs_set[3];
+ /* REGS array size is ebl_frame_nregs. */
+ Dwarf_Addr regs[];
+};
+
+/* Fetch value from Dwfl_Frame->regs indexed by DWARF REGNO.
+ No error code is set if the function returns FALSE. */
+
+static inline bool
+dwfl_frame_reg_get (Dwfl_Frame *state, unsigned regno, Dwarf_Addr *val)
+{
+ Ebl *ebl = state->thread->process->ebl;
+ if (regno >= ebl->frame_nregs)
+ return false;
+ if ((state->regs_set[regno / sizeof (*state->regs_set) / 8]
+ & (1U << (regno % (sizeof (*state->regs_set) * 8)))) == 0)
+ return false;
+ if (val)
+ *val = state->regs[regno];
+ return true;
+}
+/* Store value to Dwfl_Frame->regs indexed by DWARF REGNO.
+ No error code is set if the function returns FALSE. */
+
+static inline bool
+dwfl_frame_reg_set (Dwfl_Frame *state, unsigned regno, Dwarf_Addr val)
+{
+ Ebl *ebl = state->thread->process->ebl;
+ if (regno >= ebl->frame_nregs)
+ return false;
+ /* For example i386 user_regs_struct has signed fields. */
+ if (ebl->class == ELFCLASS32)
+ val &= 0xffffffff;
+ state->regs_set[regno / sizeof (*state->regs_set) / 8] |=
+ (1U << (regno % (sizeof (*state->regs_set) * 8)));
+ state->regs[regno] = val;
+ return true;
+}
/* Information cached about each CU in Dwfl_Module.dw. */
struct dwfl_cu
@@ -415,6 +519,29 @@ extern Dwfl_Module *__libdwfl_report_offline (Dwfl *dwfl, const char *name,
const char *))
internal_function;
+/* Free PROCESS. Unlink and free also any structures it references. */
+extern void __libdwfl_process_free (Dwfl_Process *process)
+ internal_function;
+
+/* Update STATE->UNWOUND for the unwound frame.
+ Functions sets dwfl_errno (). */
+extern void __libdwfl_frame_unwind (Dwfl_Frame *state)
+ internal_function;
+
+/* Call dwfl_attach_state for PID, return true if successful. */
+extern bool __libdwfl_attach_state_for_pid (Dwfl *dwfl, pid_t pid)
+ internal_function;
+
+/* Call dwfl_attach_state for CORE, return true if successful. */
+extern bool __libdwfl_attach_state_for_core (Dwfl *dwfl, Elf *core)
+ internal_function;
+
+/* Align segment START downwards or END upwards addresses according to DWFL. */
+extern GElf_Addr __libdwfl_segment_start (Dwfl *dwfl, GElf_Addr start)
+ internal_function;
+extern GElf_Addr __libdwfl_segment_end (Dwfl *dwfl, GElf_Addr end)
+ internal_function;
+
/* Decompression wrappers: decompress whole file into memory. */
extern Dwfl_Error __libdw_gunzip (int fd, off64_t start_offset,
void *mapped, size_t mapped_size,
@@ -557,6 +684,16 @@ INTDECL (dwfl_offline_section_address)
INTDECL (dwfl_module_relocate_address)
INTDECL (dwfl_module_dwarf_cfi)
INTDECL (dwfl_module_eh_cfi)
+INTDECL (dwfl_attach_state)
+INTDECL (dwfl_pid)
+INTDECL (dwfl_thread_dwfl)
+INTDECL (dwfl_thread_tid)
+INTDECL (dwfl_frame_thread)
+INTDECL (dwfl_thread_state_registers)
+INTDECL (dwfl_thread_state_register_pc)
+INTDECL (dwfl_next_thread)
+INTDECL (dwfl_thread_getframes)
+INTDECL (dwfl_frame_pc)
/* Leading arguments standard to callbacks passed a Dwfl_Module. */
#define MODCB_ARGS(mod) (mod), &(mod)->userdata, (mod)->name, (mod)->low_addr
--- a/libdwfl/linux-proc-maps.c
+++ b/libdwfl/linux-proc-maps.c
@@ -1,5 +1,5 @@
/* Standard libdwfl callbacks for debugging a live Linux process.
- Copyright (C) 2005-2010 Red Hat, Inc.
+ Copyright (C) 2005-2010, 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -300,6 +300,13 @@ dwfl_linux_proc_report (Dwfl *dwfl, pid_t pid)
fclose (f);
+ if (result == 0)
+ {
+ /* Possible error is ignored, DWFL still may be useful for non-unwinding
+ operations. */
+ __libdwfl_attach_state_for_pid (dwfl, pid);
+ }
+
return result;
}
INTDEF (dwfl_linux_proc_report)
--- a/libdwfl/segment.c
+++ b/libdwfl/segment.c
@@ -1,5 +1,5 @@
/* Manage address space lookup table for libdwfl.
- Copyright (C) 2008, 2009, 2010 Red Hat, Inc.
+ Copyright (C) 2008, 2009, 2010, 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -28,16 +28,18 @@
#include "libdwflP.h"
-static GElf_Addr
-segment_start (Dwfl *dwfl, GElf_Addr start)
+GElf_Addr
+internal_function
+__libdwfl_segment_start (Dwfl *dwfl, GElf_Addr start)
{
if (dwfl->segment_align > 1)
start &= -dwfl->segment_align;
return start;
}
-static GElf_Addr
-segment_end (Dwfl *dwfl, GElf_Addr end)
+GElf_Addr
+internal_function
+__libdwfl_segment_end (Dwfl *dwfl, GElf_Addr end)
{
if (dwfl->segment_align > 1)
end = (end + dwfl->segment_align - 1) & -dwfl->segment_align;
@@ -156,8 +158,8 @@ reify_segments (Dwfl *dwfl)
for (Dwfl_Module *mod = dwfl->modulelist; mod != NULL; mod = mod->next)
if (! mod->gc)
{
- const GElf_Addr start = segment_start (dwfl, mod->low_addr);
- const GElf_Addr end = segment_end (dwfl, mod->high_addr);
+ const GElf_Addr start = __libdwfl_segment_start (dwfl, mod->low_addr);
+ const GElf_Addr end = __libdwfl_segment_end (dwfl, mod->high_addr);
bool resized = false;
int idx = lookup (dwfl, start, hint);
@@ -296,8 +298,9 @@ dwfl_report_segment (Dwfl *dwfl, int ndx, const GElf_Phdr *phdr, GElf_Addr bias,
dwfl->lookup_module = NULL;
}
- GElf_Addr start = segment_start (dwfl, bias + phdr->p_vaddr);
- GElf_Addr end = segment_end (dwfl, bias + phdr->p_vaddr + phdr->p_memsz);
+ GElf_Addr start = __libdwfl_segment_start (dwfl, bias + phdr->p_vaddr);
+ GElf_Addr end = __libdwfl_segment_end (dwfl,
+ bias + phdr->p_vaddr + phdr->p_memsz);
/* Coalesce into the last one if contiguous and matching. */
if (ndx != dwfl->lookup_tail_ndx