2004-08-19 15:39:10 +02:00
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2002-2003 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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Modified for x86_64 by Max Asbock <masbock@us.ibm.com>
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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 <signal.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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int ret, i;
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/* Only attempt DWARF based unwinding since DWARF frame info is
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always expected to be there. With the exception of signal frames. */
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if (!unw_is_signal_frame (cursor))
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{
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if ((ret = dwarf_step (&c->dwarf)) < 0)
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{
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Debug(1, "dwarf step failed\n");
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return ret;
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}
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}
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else
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{
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struct dwarf_loc rbp_loc, rsp_loc, rip_loc;
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struct ucontext *ucontext = (struct ucontext *)c->dwarf.cfa;
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unw_word_t *uc_gregs = &ucontext->uc_mcontext.gregs[0];
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Debug(1, "signal frame, skip over trampoline\n");
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c->sigcontext_format = X86_64_SCF_LINUX_RT_SIGFRAME;
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c->sigcontext_addr = c->dwarf.cfa;
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#if 0
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/* XXX this needs to be fixed for cross-compilation --davidm */
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rsp_loc = DWARF_LOC ((unw_word_t)&uc_gregs[REG_RSP], 0);
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rbp_loc = DWARF_LOC ((unw_word_t)&uc_gregs[REG_RBP], 0);
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rip_loc = DWARF_LOC ((unw_word_t)&uc_gregs[REG_RIP], 0);
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#endif
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ret = dwarf_get (&c->dwarf, rsp_loc, &c->dwarf.cfa);
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if (ret < 0)
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return ret;
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/* Mark all registers unsaved */
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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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c->dwarf.loc[RBP] = rbp_loc;
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c->dwarf.loc[RSP] = rsp_loc;
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c->dwarf.loc[RIP] = rip_loc;
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c->dwarf.ret_addr_column = RIP;
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if (!DWARF_IS_NULL_LOC (c->dwarf.loc[RBP]))
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{
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ret = dwarf_get (&c->dwarf, c->dwarf.loc[RIP], &c->dwarf.ip);
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if (ret < 0)
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return ret;
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}
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else
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c->dwarf.ip = 0;
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}
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return (c->dwarf.ip == 0) ? 0 : 1;
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}
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