text: /* libunwind - a platform-independent unwind library
     Copyright (C) 2008 CodeSourcery
     Copyright 2011 Linaro Limited
     Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
  
  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"
  
  #ifndef UNW_REMOTE_ONLY
  
  HIDDEN inline int
  arm_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
  {
  #ifdef __linux__
    struct cursor *c = (struct cursor *) cursor;
    unw_tdep_context_t *uc = c->dwarf.as_arg;
  
    if (c->sigcontext_format == ARM_SCF_NONE)
      {
        /* Since there are no signals involved here we restore the non scratch
           registers only.  */
        unsigned long regs[10];
        regs[0] = uc->regs[4];
        regs[1] = uc->regs[5];
        regs[2] = uc->regs[6];
        regs[3] = uc->regs[7];
        regs[4] = uc->regs[8];
        regs[5] = uc->regs[9];
        regs[6] = uc->regs[10];
        regs[7] = uc->regs[11]; /* FP */
        regs[8] = uc->regs[13]; /* SP */
        regs[9] = uc->regs[14]; /* LR */
  
        struct regs_overlay {
                char x[sizeof(regs)];
        };
  
        asm __volatile__ (
          "ldmia %0, {r4-r12, lr}\n"
          "mov sp, r12\n"
          "bx lr\n"
          : : "r" (regs),
              "m" (*(struct regs_overlay *)regs)
        );
      }
    else
      {
        /* In case a signal frame is involved, we're using its trampoline which
           calls sigreturn.  */
        struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
        sc->arm_r0 = uc->regs[0];
        sc->arm_r1 = uc->regs[1];
        sc->arm_r2 = uc->regs[2];
        sc->arm_r3 = uc->regs[3];
        sc->arm_r4 = uc->regs[4];
        sc->arm_r5 = uc->regs[5];
        sc->arm_r6 = uc->regs[6];
        sc->arm_r7 = uc->regs[7];
        sc->arm_r8 = uc->regs[8];
        sc->arm_r9 = uc->regs[9];
        sc->arm_r10 = uc->regs[10];
        sc->arm_fp = uc->regs[11]; /* FP */
        sc->arm_ip = uc->regs[12]; /* IP */
        sc->arm_sp = uc->regs[13]; /* SP */
        sc->arm_lr = uc->regs[14]; /* LR */
        sc->arm_pc = uc->regs[15]; /* PC */
        /* clear the ITSTATE bits.  */
        sc->arm_cpsr &= 0xf9ff03ffUL;
  
        /* Set the SP and the PC in order to continue execution at the modified
           trampoline which restores the signal mask and the registers.  */
        asm __volatile__ (
          "mov sp, %0\n"
          "bx %1\n"
          : : "r" (c->sigcontext_sp), "r" (c->sigcontext_pc)
        );
     }
    unreachable();
  #else
    printf ("%s: implement me\n", __FUNCTION__);
  #endif
    return -UNW_EINVAL;
  }
  
  #endif /* !UNW_REMOTE_ONLY */
  
  static inline void
  establish_machine_state (struct cursor *c)
  {
    unw_addr_space_t as = c->dwarf.as;
    void *arg = c->dwarf.as_arg;
    unw_fpreg_t fpval;
    unw_word_t val;
    int reg;
  
    Debug (8, "copying out cursor state\n");
  
    for (reg = 0; reg <= UNW_REG_LAST; ++reg)
      {
        Debug (16, "copying %s %d\n", unw_regname (reg), reg);
        if (unw_is_fpreg (reg))
          {
            if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
              as->acc.access_fpreg (as, reg, &fpval, 1, arg);
          }
        else
          {
            if (tdep_access_reg (c, reg, &val, 0) >= 0)
              as->acc.access_reg (as, reg, &val, 1, arg);
          }
      }
  }
  
  int
  unw_resume (unw_cursor_t *cursor)
  {
    struct cursor *c = (struct cursor *) cursor;
  
    Debug (1, "(cursor=%p)\n", c);
  
    if (!c->dwarf.ip)
      {
        /* This can happen easily when the frame-chain gets truncated
           due to bad or missing unwind-info.  */
        Debug (1, "refusing to resume execution at address 0\n");
        return -UNW_EINVAL;
      }
  
    establish_machine_state (c);
  
    return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
                                       c->dwarf.as_arg);
  }
  