src/libs/libunwind/aarch64/Gstep.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2008 CodeSourcery
   3    Copyright (C) 2011-2013 Linaro Limited
   4    Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
   5
   6 This file is part of libunwind.
   7
   8 Permission is hereby granted, free of charge, to any person obtaining
   9 a copy of this software and associated documentation files (the
  10 "Software"), to deal in the Software without restriction, including
  11 without limitation the rights to use, copy, modify, merge, publish,
  12 distribute, sublicense, and/or sell copies of the Software, and to
  13 permit persons to whom the Software is furnished to do so, subject to
  14 the following conditions:
  15
  16 The above copyright notice and this permission notice shall be
  17 included in all copies or substantial portions of the Software.
  18
  19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  26
  27 #include "unwind_i.h"
  28 #include "offsets.h"
  29
  30 PROTECTED int
  31 unw_handle_signal_frame (unw_cursor_t *cursor)
  32 {
  33   struct cursor *c = (struct cursor *) cursor;
  34   int ret;
  35   unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
  36   struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0);
  37
  38   if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0)
  39     return -UNW_EUNSPEC;
  40
  41   ret = unw_is_signal_frame (cursor);
  42   Debug(1, "unw_is_signal_frame()=%d\n", ret);
  43
  44   /* Save the SP and PC to be able to return execution at this point
  45      later in time (unw_resume).  */
  46   c->sigcontext_sp = c->dwarf.cfa;
  47   c->sigcontext_pc = c->dwarf.ip;
  48
  49   if (ret)
  50     {
  51       c->sigcontext_format = AARCH64_SCF_LINUX_RT_SIGFRAME;
  52       sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF;
  53     }
  54   else
  55     return -UNW_EUNSPEC;
  56
  57   c->sigcontext_addr = sc_addr;
  58   c->frame_info.frame_type = UNW_AARCH64_FRAME_SIGRETURN;
  59   c->frame_info.cfa_reg_offset = sc_addr - sp_addr;
  60
  61   /* Update the dwarf cursor.
  62      Set the location of the registers to the corresponding addresses of the
  63      uc_mcontext / sigcontext structure contents.  */
  64   c->dwarf.loc[UNW_AARCH64_X0]  = DWARF_LOC (sc_addr + LINUX_SC_X0_OFF, 0);
  65   c->dwarf.loc[UNW_AARCH64_X1]  = DWARF_LOC (sc_addr + LINUX_SC_X1_OFF, 0);
  66   c->dwarf.loc[UNW_AARCH64_X2]  = DWARF_LOC (sc_addr + LINUX_SC_X2_OFF, 0);
  67   c->dwarf.loc[UNW_AARCH64_X3]  = DWARF_LOC (sc_addr + LINUX_SC_X3_OFF, 0);
  68   c->dwarf.loc[UNW_AARCH64_X4]  = DWARF_LOC (sc_addr + LINUX_SC_X4_OFF, 0);
  69   c->dwarf.loc[UNW_AARCH64_X5]  = DWARF_LOC (sc_addr + LINUX_SC_X5_OFF, 0);
  70   c->dwarf.loc[UNW_AARCH64_X6]  = DWARF_LOC (sc_addr + LINUX_SC_X6_OFF, 0);
  71   c->dwarf.loc[UNW_AARCH64_X7]  = DWARF_LOC (sc_addr + LINUX_SC_X7_OFF, 0);
  72   c->dwarf.loc[UNW_AARCH64_X8]  = DWARF_LOC (sc_addr + LINUX_SC_X8_OFF, 0);
  73   c->dwarf.loc[UNW_AARCH64_X9]  = DWARF_LOC (sc_addr + LINUX_SC_X9_OFF, 0);
  74   c->dwarf.loc[UNW_AARCH64_X10] = DWARF_LOC (sc_addr + LINUX_SC_X10_OFF, 0);
  75   c->dwarf.loc[UNW_AARCH64_X11] = DWARF_LOC (sc_addr + LINUX_SC_X11_OFF, 0);
  76   c->dwarf.loc[UNW_AARCH64_X12] = DWARF_LOC (sc_addr + LINUX_SC_X12_OFF, 0);
  77   c->dwarf.loc[UNW_AARCH64_X13] = DWARF_LOC (sc_addr + LINUX_SC_X13_OFF, 0);
  78   c->dwarf.loc[UNW_AARCH64_X14] = DWARF_LOC (sc_addr + LINUX_SC_X14_OFF, 0);
  79   c->dwarf.loc[UNW_AARCH64_X15] = DWARF_LOC (sc_addr + LINUX_SC_X15_OFF, 0);
  80   c->dwarf.loc[UNW_AARCH64_X16] = DWARF_LOC (sc_addr + LINUX_SC_X16_OFF, 0);
  81   c->dwarf.loc[UNW_AARCH64_X17] = DWARF_LOC (sc_addr + LINUX_SC_X17_OFF, 0);
  82   c->dwarf.loc[UNW_AARCH64_X18] = DWARF_LOC (sc_addr + LINUX_SC_X18_OFF, 0);
  83   c->dwarf.loc[UNW_AARCH64_X19] = DWARF_LOC (sc_addr + LINUX_SC_X19_OFF, 0);
  84   c->dwarf.loc[UNW_AARCH64_X20] = DWARF_LOC (sc_addr + LINUX_SC_X20_OFF, 0);
  85   c->dwarf.loc[UNW_AARCH64_X21] = DWARF_LOC (sc_addr + LINUX_SC_X21_OFF, 0);
  86   c->dwarf.loc[UNW_AARCH64_X22] = DWARF_LOC (sc_addr + LINUX_SC_X22_OFF, 0);
  87   c->dwarf.loc[UNW_AARCH64_X23] = DWARF_LOC (sc_addr + LINUX_SC_X23_OFF, 0);
  88   c->dwarf.loc[UNW_AARCH64_X24] = DWARF_LOC (sc_addr + LINUX_SC_X24_OFF, 0);
  89   c->dwarf.loc[UNW_AARCH64_X25] = DWARF_LOC (sc_addr + LINUX_SC_X25_OFF, 0);
  90   c->dwarf.loc[UNW_AARCH64_X26] = DWARF_LOC (sc_addr + LINUX_SC_X26_OFF, 0);
  91   c->dwarf.loc[UNW_AARCH64_X27] = DWARF_LOC (sc_addr + LINUX_SC_X27_OFF, 0);
  92   c->dwarf.loc[UNW_AARCH64_X28] = DWARF_LOC (sc_addr + LINUX_SC_X28_OFF, 0);
  93   c->dwarf.loc[UNW_AARCH64_X29] = DWARF_LOC (sc_addr + LINUX_SC_X29_OFF, 0);
  94   c->dwarf.loc[UNW_AARCH64_X30] = DWARF_LOC (sc_addr + LINUX_SC_X30_OFF, 0);
  95   c->dwarf.loc[UNW_AARCH64_SP]  = DWARF_LOC (sc_addr + LINUX_SC_SP_OFF, 0);
  96   c->dwarf.loc[UNW_AARCH64_PC]  = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0);
  97   c->dwarf.loc[UNW_AARCH64_PSTATE]  = DWARF_LOC (sc_addr + LINUX_SC_PSTATE_OFF, 0);
  98
  99   /* Set SP/CFA and PC/IP.  */
 100   dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_SP], &c->dwarf.cfa);
 101   dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_PC], &c->dwarf.ip);
 102
 103   c->dwarf.pi_valid = 0;
 104
 105   return 1;
 106 }
 107
 108 PROTECTED int
 109 unw_step (unw_cursor_t *cursor)
 110 {
 111   struct cursor *c = (struct cursor *) cursor;
 112   int ret;
 113
 114   Debug (1, "(cursor=%p, ip=0x%016lx, cfa=0x%016lx))\n",
 115          c, c->dwarf.ip, c->dwarf.cfa);
 116
 117   /* Check if this is a signal frame. */
 118   if (unw_is_signal_frame (cursor))
 119     return unw_handle_signal_frame (cursor);
 120
 121   ret = dwarf_step (&c->dwarf);
 122   Debug(1, "dwarf_step()=%d\n", ret);
 123
 124   if (unlikely (ret == -UNW_ESTOPUNWIND))
 125     return ret;
 126
 127   if (unlikely (ret < 0))
 128     return 0;
 129
 130   return (c->dwarf.ip == 0) ? 0 : 1;
 131 }