2008-02-05 01:16:37 +01:00
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2008 CodeSourcery
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2011-03-15 19:15:43 +01:00
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Copyright 2011 Linaro Limited
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2008-02-05 01:16:37 +01:00
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "unwind_i.h"
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#include "offsets.h"
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2011-03-15 19:15:43 +01:00
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#include "ex_tables.h"
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2011-04-21 16:54:39 +02:00
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#include <signal.h>
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2011-04-01 18:41:16 +02:00
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#define arm_exidx_step UNW_OBJ(arm_exidx_step)
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2011-03-15 19:15:43 +01:00
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static inline int
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arm_exidx_step (struct cursor *c)
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{
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2011-03-23 16:54:59 +01:00
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unw_word_t old_ip, old_cfa;
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struct arm_exidx_entry *entry;
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uint8_t buf[32];
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int ret;
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old_ip = c->dwarf.ip;
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old_cfa = c->dwarf.cfa;
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/* mark PC unsaved */
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c->dwarf.loc[UNW_ARM_R15] = DWARF_NULL_LOC;
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2011-07-14 15:44:02 +02:00
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if ((ret = tdep_find_proc_info (&c->dwarf, c->dwarf.ip, 1)) < 0)
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return -UNW_ENOINFO;
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2011-03-15 19:15:43 +01:00
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2011-07-14 15:44:02 +02:00
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if (c->dwarf.pi.format != UNW_INFO_FORMAT_ARM_EXIDX)
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2011-03-15 19:15:43 +01:00
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return -UNW_ENOINFO;
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2011-07-14 15:44:02 +02:00
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entry = (struct arm_exidx_entry *)c->dwarf.pi.unwind_info;
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2011-03-23 16:54:59 +01:00
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ret = arm_exidx_extract (entry, buf);
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2011-03-15 19:15:43 +01:00
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if (ret < 0)
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return ret;
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2011-03-23 16:54:59 +01:00
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ret = arm_exidx_decode (buf, ret, &c->dwarf);
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2011-03-15 19:15:43 +01:00
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if (ret < 0)
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2011-03-23 16:54:59 +01:00
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return ret;
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2011-03-15 19:15:43 +01:00
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2011-03-23 16:54:59 +01:00
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if (c->dwarf.ip == old_ip && c->dwarf.cfa == old_cfa)
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{
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Dprintf ("%s: ip and cfa unchanged; stopping here (ip=0x%lx)\n",
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__FUNCTION__, (long) c->dwarf.ip);
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return -UNW_EBADFRAME;
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}
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return (c->dwarf.ip == 0) ? 0 : 1;
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2011-03-15 19:15:43 +01:00
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}
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2008-02-05 01:16:37 +01:00
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2011-04-21 16:54:39 +02:00
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PROTECTED int
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unw_handle_signal_frame (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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int ret;
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unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
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struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0);
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if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0)
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return -UNW_EUNSPEC;
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/* Obtain signal frame type (non-RT or RT). */
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ret = unw_is_signal_frame (cursor);
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/* Save the SP and PC to be able to return execution at this point
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later in time (unw_resume). */
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c->sigcontext_sp = c->dwarf.cfa;
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c->sigcontext_pc = c->dwarf.ip;
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/* Since kernel version 2.6.18 the non-RT signal frame starts with a
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ucontext while the RT signal frame starts with a siginfo, followed
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by a sigframe whose first element is an ucontext.
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Prior 2.6.18 the non-RT signal frame starts with a sigcontext while
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the RT signal frame starts with two pointers followed by a siginfo
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and an ucontext. The first pointer points to the start of the siginfo
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structure and the second one to the ucontext structure. */
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if (ret == 1)
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{
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/* Handle non-RT signal frames. Check if the first word on the stack
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is the magic number. */
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if (sp == 0x5ac3c35a)
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{
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c->sigcontext_format = ARM_SCF_LINUX_SIGFRAME;
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sc_addr = sp_addr + LINUX_UC_MCONTEXT_OFF;
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}
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else
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{
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c->sigcontext_format = ARM_SCF_LINUX_OLD_SIGFRAME;
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sc_addr = sp_addr;
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}
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c->sigcontext_addr = sp_addr;
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}
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else if (ret == 2)
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{
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/* Handle RT signal frames. Check if the first word on the stack is a
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pointer to the siginfo structure. */
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if (sp == sp_addr + 8)
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{
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c->sigcontext_format = ARM_SCF_LINUX_OLD_RT_SIGFRAME;
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c->sigcontext_addr = sp_addr + 8 + sizeof (siginfo_t);
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}
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else
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{
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c->sigcontext_format = ARM_SCF_LINUX_RT_SIGFRAME;
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c->sigcontext_addr = sp_addr + sizeof (siginfo_t);
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}
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sc_addr = c->sigcontext_addr + LINUX_UC_MCONTEXT_OFF;
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}
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else
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return -UNW_EUNSPEC;
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/* Update the dwarf cursor.
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Set the location of the registers to the corresponding addresses of the
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uc_mcontext / sigcontext structure contents. */
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c->dwarf.loc[UNW_ARM_R0] = DWARF_LOC (sc_addr + LINUX_SC_R0_OFF, 0);
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c->dwarf.loc[UNW_ARM_R1] = DWARF_LOC (sc_addr + LINUX_SC_R1_OFF, 0);
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c->dwarf.loc[UNW_ARM_R2] = DWARF_LOC (sc_addr + LINUX_SC_R2_OFF, 0);
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c->dwarf.loc[UNW_ARM_R3] = DWARF_LOC (sc_addr + LINUX_SC_R3_OFF, 0);
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c->dwarf.loc[UNW_ARM_R4] = DWARF_LOC (sc_addr + LINUX_SC_R4_OFF, 0);
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c->dwarf.loc[UNW_ARM_R5] = DWARF_LOC (sc_addr + LINUX_SC_R5_OFF, 0);
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c->dwarf.loc[UNW_ARM_R6] = DWARF_LOC (sc_addr + LINUX_SC_R6_OFF, 0);
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c->dwarf.loc[UNW_ARM_R7] = DWARF_LOC (sc_addr + LINUX_SC_R7_OFF, 0);
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c->dwarf.loc[UNW_ARM_R8] = DWARF_LOC (sc_addr + LINUX_SC_R8_OFF, 0);
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c->dwarf.loc[UNW_ARM_R9] = DWARF_LOC (sc_addr + LINUX_SC_R9_OFF, 0);
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c->dwarf.loc[UNW_ARM_R10] = DWARF_LOC (sc_addr + LINUX_SC_R10_OFF, 0);
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c->dwarf.loc[UNW_ARM_R11] = DWARF_LOC (sc_addr + LINUX_SC_FP_OFF, 0);
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c->dwarf.loc[UNW_ARM_R12] = DWARF_LOC (sc_addr + LINUX_SC_IP_OFF, 0);
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c->dwarf.loc[UNW_ARM_R13] = DWARF_LOC (sc_addr + LINUX_SC_SP_OFF, 0);
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c->dwarf.loc[UNW_ARM_R14] = DWARF_LOC (sc_addr + LINUX_SC_LR_OFF, 0);
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c->dwarf.loc[UNW_ARM_R15] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0);
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/* Set SP/CFA and PC/IP. */
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dwarf_get (&c->dwarf, c->dwarf.loc[UNW_ARM_R13], &c->dwarf.cfa);
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dwarf_get (&c->dwarf, c->dwarf.loc[UNW_ARM_R15], &c->dwarf.ip);
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return 1;
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}
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2008-02-05 01:16:37 +01:00
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PROTECTED int
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unw_step (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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2010-05-27 04:28:44 +02:00
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int ret = -UNW_EUNSPEC;
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2008-02-05 01:16:37 +01:00
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Debug (1, "(cursor=%p)\n", c);
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2011-04-21 16:54:39 +02:00
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/* Check if this is a signal frame. */
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if (unw_is_signal_frame (cursor))
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return unw_handle_signal_frame (cursor);
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2011-03-23 16:55:02 +01:00
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/* First, try DWARF-based unwinding. */
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2010-05-27 04:28:44 +02:00
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if (UNW_TRY_METHOD(UNW_ARM_METHOD_DWARF))
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{
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ret = dwarf_step (&c->dwarf);
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Debug(1, "dwarf_step()=%d\n", ret);
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2008-02-05 01:16:37 +01:00
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2010-05-27 04:28:44 +02:00
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if (unlikely (ret == -UNW_ESTOPUNWIND))
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return ret;
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2008-02-05 01:16:37 +01:00
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2010-05-27 04:28:44 +02:00
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if (ret < 0 && ret != -UNW_ENOINFO)
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{
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Debug (2, "returning %d\n", ret);
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return ret;
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}
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}
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2008-02-05 01:16:37 +01:00
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2011-03-23 16:55:02 +01:00
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/* Next, try extbl-based unwinding. */
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if (UNW_TRY_METHOD (UNW_ARM_METHOD_EXIDX))
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{
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ret = arm_exidx_step (c);
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if (ret >= 0)
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return 1;
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if (ret == -UNW_ESTOPUNWIND)
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return 0;
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}
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/* Fall back on APCS frame parsing.
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Note: This won't work in case the ARM EABI is used. */
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2010-05-27 04:28:44 +02:00
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if (unlikely (ret < 0))
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{
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if (UNW_TRY_METHOD(UNW_ARM_METHOD_FRAME))
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{
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ret = UNW_ESUCCESS;
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/* DWARF unwinding failed, try to follow APCS/optimized APCS frame chain */
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unw_word_t instr, i;
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Debug (13, "dwarf_step() failed (ret=%d), trying frame-chain\n", ret);
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dwarf_loc_t ip_loc, fp_loc;
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unw_word_t frame;
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/* Mark all registers unsaved, since we don't know where
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they are saved (if at all), except for the EBP and
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EIP. */
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if (dwarf_get(&c->dwarf, c->dwarf.loc[UNW_ARM_R11], &frame) < 0)
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{
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return 0;
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}
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for (i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i) {
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c->dwarf.loc[i] = DWARF_NULL_LOC;
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}
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if (frame)
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{
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if (dwarf_get(&c->dwarf, DWARF_LOC(frame, 0), &instr) < 0)
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{
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return 0;
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}
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instr -= 8;
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if (dwarf_get(&c->dwarf, DWARF_LOC(instr, 0), &instr) < 0)
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{
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return 0;
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}
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if ((instr & 0xFFFFD800) == 0xE92DD800)
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{
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/* Standard APCS frame. */
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ip_loc = DWARF_LOC(frame - 4, 0);
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fp_loc = DWARF_LOC(frame - 12, 0);
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}
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else
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{
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/* Codesourcery optimized normal frame. */
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ip_loc = DWARF_LOC(frame, 0);
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fp_loc = DWARF_LOC(frame - 4, 0);
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}
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if (dwarf_get(&c->dwarf, ip_loc, &c->dwarf.ip) < 0)
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{
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return 0;
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}
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c->dwarf.loc[UNW_ARM_R12] = ip_loc;
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c->dwarf.loc[UNW_ARM_R11] = fp_loc;
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Debug(15, "ip=%lx\n", c->dwarf.ip);
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}
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else
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{
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ret = -UNW_ENOINFO;
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}
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}
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}
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return ret == -UNW_ENOINFO ? 0 : 1;
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2008-02-05 01:16:37 +01:00
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}
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