src/libs/libunwind/hppa/Gresume.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
   3         Contributed by David Mosberger-Tang <davidm@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 <stdlib.h>
  27
  28 #include "unwind_i.h"
  29
  30 #ifndef UNW_REMOTE_ONLY
  31
  32 #if defined(__linux)
  33
  34 # include <sys/syscall.h>
  35
  36 static NORETURN inline long
  37 my_rt_sigreturn (void *new_sp, int in_syscall)
  38 {
  39   register unsigned long r25 __asm__ ("r25") = (in_syscall != 0);
  40   register unsigned long r20 __asm__ ("r20") = SYS_rt_sigreturn;
  41
  42   __asm__ __volatile__ ("copy %0, %%sp\n"
  43                         "be,l 0x100(%%sr2,%%r0),%%sr0,%%r31\n"
  44                         "nop"
  45                         :
  46                         : "r"(new_sp), "r"(r20), "r"(r25)
  47                         : "memory");
  48   abort ();
  49 }
  50
  51 #endif /* __linux */
  52
  53 HIDDEN inline int
  54 hppa_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
  55 {
  56 #if defined(__linux)
  57   struct cursor *c = (struct cursor *) cursor;
  58   ucontext_t *uc = c->dwarf.as_arg;
  59
  60   /* Ensure c->pi is up-to-date.  On PA-RISC, it's relatively common to be
  61      missing DWARF unwind info.  We don't want to fail in that case,
  62      because the frame-chain still would let us do a backtrace at
  63      least.  */
  64   dwarf_make_proc_info (&c->dwarf);
  65
  66   if (unlikely (c->sigcontext_format != HPPA_SCF_NONE))
  67     {
  68       struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
  69
  70       Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
  71       my_rt_sigreturn (sc, (sc->sc_flags & PARISC_SC_FLAG_IN_SYSCALL) != 0);
  72     }
  73   else
  74     {
  75       Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
  76       setcontext (uc);
  77     }
  78 #else
  79 # warning Implement me!
  80 #endif
  81   return -UNW_EINVAL;
  82 }
  83
  84 #endif /* !UNW_REMOTE_ONLY */
  85
  86 /* This routine is responsible for copying the register values in
  87    cursor C and establishing them as the current machine state. */
  88
  89 static inline int
  90 establish_machine_state (struct cursor *c)
  91 {
  92   int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *,
  93                      int write, void *);
  94   int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *,
  95                        int write, void *);
  96   unw_addr_space_t as = c->dwarf.as;
  97   void *arg = c->dwarf.as_arg;
  98   unw_fpreg_t fpval;
  99   unw_word_t val;
 100   int reg;
 101
 102   access_reg = as->acc.access_reg;
 103   access_fpreg = as->acc.access_fpreg;
 104
 105   Debug (8, "copying out cursor state\n");
 106
 107   for (reg = 0; reg <= UNW_REG_LAST; ++reg)
 108     {
 109       Debug (16, "copying %s %d\n", unw_regname (reg), reg);
 110       if (unw_is_fpreg (reg))
 111         {
 112           if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
 113             (*access_fpreg) (as, reg, &fpval, 1, arg);
 114         }
 115       else
 116         {
 117           if (tdep_access_reg (c, reg, &val, 0) >= 0)
 118             (*access_reg) (as, reg, &val, 1, arg);
 119         }
 120     }
 121   return 0;
 122 }
 123
 124 PROTECTED int
 125 unw_resume (unw_cursor_t *cursor)
 126 {
 127   struct cursor *c = (struct cursor *) cursor;
 128   int ret;
 129
 130   Debug (1, "(cursor=%p)\n", c);
 131
 132   if (!c->dwarf.ip)
 133     {
 134       /* This can happen easily when the frame-chain gets truncated
 135          due to bad or missing unwind-info.  */
 136       Debug (1, "refusing to resume execution at address 0\n");
 137       return -UNW_EINVAL;
 138     }
 139
 140   if ((ret = establish_machine_state (c)) < 0)
 141     return ret;
 142
 143   return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
 144                                      c->dwarf.as_arg);
 145 }