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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2003-2004 Hewlett-Packard Co
- Contributed by David Mosberger
- This file is part of libunwind.
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
- #include "unwind_i.h"
- #include "offsets.h"
- PROTECTED int
- unw_step (unw_cursor_t *cursor)
- {
- struct cursor *c = (struct cursor *) cursor;
- int ret, i;
- Debug (1, "(cursor=%p, ip=0x%08x)\n", c, (unsigned) c->dwarf.ip);
- /* Try DWARF-based unwinding... */
- ret = dwarf_step (&c->dwarf);
- if (ret < 0 && ret != -UNW_ENOINFO)
- {
- Debug (2, "returning %d\n", ret);
- return ret;
- }
- if (unlikely (ret < 0))
- {
- /* DWARF failed, let's see if we can follow the frame-chain
- or skip over the signal trampoline. */
- Debug (13, "dwarf_step() failed (ret=%d), trying fallback\n", ret);
- if (unw_is_signal_frame (cursor))
- {
- #ifdef __linux__
- /* Assume that the trampoline is at the beginning of the
- sigframe. */
- unw_word_t ip, sc_addr = c->dwarf.ip + LINUX_RT_SIGFRAME_UC_OFF;
- dwarf_loc_t iaoq_loc = DWARF_LOC (sc_addr + LINUX_SC_IAOQ_OFF, 0);
- c->sigcontext_format = HPPA_SCF_LINUX_RT_SIGFRAME;
- c->sigcontext_addr = sc_addr;
- c->dwarf.ret_addr_column = UNW_HPPA_RP;
- if ((ret = dwarf_get (&c->dwarf, iaoq_loc, &ip)) , 0)
- {
- Debug (2, "failed to read IAOQ[1] (ret=%d)\n", ret);
- return ret;
- }
- c->dwarf.ip = ip & ~0x3; /* mask out the privilege level */
- for (i = 0; i < 32; ++i)
- {
- c->dwarf.loc[UNW_HPPA_GR + i]
- = DWARF_LOC (sc_addr + LINUX_SC_GR_OFF + 4*i, 0);
- c->dwarf.loc[UNW_HPPA_FR + i]
- = DWARF_LOC (sc_addr + LINUX_SC_FR_OFF + 4*i, 0);
- }
- if ((ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_HPPA_SP],
- &c->dwarf.cfa)) < 0)
- {
- Debug (2, "failed to read SP (ret=%d)\n", ret);
- return ret;
- }
- #else
- # error Implement me!
- #endif
- }
- else
- c->dwarf.ip = 0;
- }
- ret = (c->dwarf.ip == 0) ? 0 : 1;
- Debug (2, "returning %d\n", ret);
- return ret;
- }
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