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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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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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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/* Try DWARF-based unwinding... this is the only method likely to work for
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ARM. */
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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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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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