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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2001-2003, 2005 Hewlett-Packard Co
      3 	Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com>
      4 
      5 This file is part of libunwind.
      6 
      7 Permission is hereby granted, free of charge, to any person obtaining
      8 a copy of this software and associated documentation files (the
      9 "Software"), to deal in the Software without restriction, including
     10 without limitation the rights to use, copy, modify, merge, publish,
     11 distribute, sublicense, and/or sell copies of the Software, and to
     12 permit persons to whom the Software is furnished to do so, subject to
     13 the following conditions:
     14 
     15 The above copyright notice and this permission notice shall be
     16 included in all copies or substantial portions of the Software.
     17 
     18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     25 
     26 #include "init.h"
     27 #include "unwind_i.h"
     28 
     29 #ifdef UNW_REMOTE_ONLY
     30 
     31 PROTECTED int
     32 unw_init_local (unw_cursor_t *cursor, unw_context_t *uc)
     33 {
     34   return -UNW_EINVAL;
     35 }
     36 
     37 #else /* !UNW_REMOTE_ONLY */
     38 
     39 static inline void
     40 set_as_arg (struct cursor *c, unw_context_t *uc)
     41 {
     42 #if defined(__linux) && defined(__KERNEL__)
     43   c->task = current;
     44   c->as_arg = &uc->sw;
     45 #else
     46   c->as_arg = uc;
     47 #endif
     48 }
     49 
     50 static inline int
     51 get_initial_stack_pointers (struct cursor *c, unw_context_t *uc,
     52 			    unw_word_t *sp, unw_word_t *bsp)
     53 {
     54 #if defined(__linux)
     55   unw_word_t sol, bspstore;
     56 
     57 #ifdef __KERNEL__
     58   sol = (uc->sw.ar_pfs >> 7) & 0x7f;
     59   bspstore = uc->sw.ar_bspstore;
     60   *sp = uc->ksp;
     61 # else
     62   sol = (uc->uc_mcontext.sc_ar_pfs >> 7) & 0x7f;
     63   bspstore = uc->uc_mcontext.sc_ar_bsp;
     64   *sp = uc->uc_mcontext.sc_gr[12];
     65 # endif
     66   *bsp = rse_skip_regs (bspstore, -sol);
     67 #elif defined(__hpux)
     68   int ret;
     69 
     70   if ((ret = ia64_get (c, IA64_REG_LOC (c, UNW_IA64_GR + 12), sp)) < 0
     71       || (ret = ia64_get (c, IA64_REG_LOC (c, UNW_IA64_AR_BSP), bsp)) < 0)
     72     return ret;
     73 #else
     74 # error Fix me.
     75 #endif
     76   return 0;
     77 }
     78 
     79 PROTECTED int
     80 unw_init_local (unw_cursor_t *cursor, unw_context_t *uc)
     81 {
     82   struct cursor *c = (struct cursor *) cursor;
     83   unw_word_t sp, bsp;
     84   int ret;
     85 
     86   if (!tdep_init_done)
     87     tdep_init ();
     88 
     89   Debug (1, "(cursor=%p)\n", c);
     90 
     91   c->as = unw_local_addr_space;
     92   set_as_arg (c, uc);
     93 
     94   if ((ret = get_initial_stack_pointers (c, uc, &sp, &bsp)) < 0)
     95     return ret;
     96 
     97   Debug (4, "initial bsp=%lx, sp=%lx\n", bsp, sp);
     98 
     99   if ((ret = common_init (c, sp, bsp)) < 0)
    100     return ret;
    101 
    102 #ifdef __hpux
    103   /* On HP-UX, the context created by getcontext() points to the
    104      getcontext() system call stub.  Step over it: */
    105   ret = unw_step (cursor);
    106 #endif
    107   return ret;
    108 }
    109 
    110 #endif /* !UNW_REMOTE_ONLY */
    111