src/libs/libunwind/x86_64/Gos-freebsd.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
   3
   4 This file is part of libunwind.
   5
   6 Permission is hereby granted, free of charge, to any person obtaining
   7 a copy of this software and associated documentation files (the
   8 "Software"), to deal in the Software without restriction, including
   9 without limitation the rights to use, copy, modify, merge, publish,
  10 distribute, sublicense, and/or sell copies of the Software, and to
  11 permit persons to whom the Software is furnished to do so, subject to
  12 the following conditions:
  13
  14 The above copyright notice and this permission notice shall be
  15 included in all copies or substantial portions of the Software.
  16
  17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  21 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <sys/ucontext.h>
  30 #include <machine/sigframe.h>
  31 #include <signal.h>
  32 #include <stddef.h>
  33 #include "unwind_i.h"
  34 #include "ucontext_i.h"
  35
  36 PROTECTED int
  37 unw_is_signal_frame (unw_cursor_t *cursor)
  38 {
  39   /* XXXKIB */
  40   struct cursor *c = (struct cursor *) cursor;
  41   unw_word_t w0, w1, w2, b0, ip;
  42   unw_addr_space_t as;
  43   unw_accessors_t *a;
  44   void *arg;
  45   int ret;
  46
  47   as = c->dwarf.as;
  48   a = unw_get_accessors (as);
  49   arg = c->dwarf.as_arg;
  50
  51   /* Check if RIP points at sigreturn sequence.
  52 48 8d 7c 24 10          lea     SIGF_UC(%rsp),%rdi
  53 6a 00                   pushq   $0
  54 48 c7 c0 a1 01 00 00    movq    $SYS_sigreturn,%rax
  55 0f 05                   syscall
  56 f4              0:      hlt
  57 eb fd                   jmp     0b
  58   */
  59
  60   ip = c->dwarf.ip;
  61   c->sigcontext_format = X86_64_SCF_NONE;
  62   if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0
  63       || (ret = (*a->access_mem) (as, ip + 8, &w1, 0, arg)) < 0
  64       || (ret = (*a->access_mem) (as, ip + 16, &w2, 0, arg)) < 0)
  65     return 0;
  66   w2 &= 0xffffff;
  67   if (w0 == 0x48006a10247c8d48 &&
  68       w1 == 0x050f000001a1c0c7 &&
  69       w2 == 0x0000000000fdebf4)
  70    {
  71      c->sigcontext_format = X86_64_SCF_FREEBSD_SIGFRAME;
  72      return (c->sigcontext_format);
  73    }
  74   /* Check if RIP points at standard syscall sequence.
  75 49 89 ca        mov    %rcx,%r10
  76 0f 05           syscall
  77   */
  78   if ((ret = (*a->access_mem) (as, ip - 5, &b0, 0, arg)) < 0)
  79     return (0);
  80   Debug (12, "b0 0x%lx\n", b0);
  81   if ((b0 & 0xffffffffffffff) == 0x050fca89490000 ||
  82       (b0 & 0xffffffffff) == 0x050fca8949)
  83    {
  84     c->sigcontext_format = X86_64_SCF_FREEBSD_SYSCALL;
  85     return (c->sigcontext_format);
  86    }
  87   return (X86_64_SCF_NONE);
  88 }
  89
  90 PROTECTED int
  91 unw_handle_signal_frame (unw_cursor_t *cursor)
  92 {
  93   struct cursor *c = (struct cursor *) cursor;
  94   unw_word_t ucontext;
  95   int ret;
  96
  97   if (c->sigcontext_format == X86_64_SCF_FREEBSD_SIGFRAME)
  98    {
  99     ucontext = c->dwarf.cfa + offsetof(struct sigframe, sf_uc);
 100     c->sigcontext_addr = c->dwarf.cfa;
 101     Debug(1, "signal frame, skip over trampoline\n");
 102
 103     struct dwarf_loc rsp_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RSP, 0);
 104     ret = dwarf_get (&c->dwarf, rsp_loc, &c->dwarf.cfa);
 105     if (ret < 0)
 106      {
 107        Debug (2, "returning %d\n", ret);
 108        return ret;
 109      }
 110
 111     c->dwarf.loc[RAX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RAX, 0);
 112     c->dwarf.loc[RDX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RDX, 0);
 113     c->dwarf.loc[RCX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RCX, 0);
 114     c->dwarf.loc[RBX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RBX, 0);
 115     c->dwarf.loc[RSI] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RSI, 0);
 116     c->dwarf.loc[RDI] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RDI, 0);
 117     c->dwarf.loc[RBP] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RBP, 0);
 118     c->dwarf.loc[RSP] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RSP, 0);
 119     c->dwarf.loc[ R8] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R8, 0);
 120     c->dwarf.loc[ R9] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R9, 0);
 121     c->dwarf.loc[R10] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R10, 0);
 122     c->dwarf.loc[R11] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R11, 0);
 123     c->dwarf.loc[R12] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R12, 0);
 124     c->dwarf.loc[R13] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R13, 0);
 125     c->dwarf.loc[R14] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R14, 0);
 126     c->dwarf.loc[R15] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R15, 0);
 127     c->dwarf.loc[RIP] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RIP, 0);
 128
 129     return 0;
 130    }
 131   else if (c->sigcontext_format == X86_64_SCF_FREEBSD_SYSCALL)
 132    {
 133     c->dwarf.loc[RCX] = c->dwarf.loc[R10];
 134     /*  rsp_loc = DWARF_LOC(c->dwarf.cfa - 8, 0);       */
 135     /*  rbp_loc = c->dwarf.loc[RBP];                    */
 136     c->dwarf.loc[RIP] = DWARF_LOC (c->dwarf.cfa, 0);
 137     ret = dwarf_get (&c->dwarf, c->dwarf.loc[RIP], &c->dwarf.ip);
 138     Debug (1, "Frame Chain [RIP=0x%Lx] = 0x%Lx\n",
 139            (unsigned long long) DWARF_GET_LOC (c->dwarf.loc[RIP]),
 140            (unsigned long long) c->dwarf.ip);
 141     if (ret < 0)
 142      {
 143        Debug (2, "returning %d\n", ret);
 144        return ret;
 145      }
 146     c->dwarf.cfa += 8;
 147     c->dwarf.use_prev_instr = 1;
 148     return 1;
 149    }
 150   else
 151     return -UNW_EBADFRAME;
 152
 153 }
 154
 155 #ifndef UNW_REMOTE_ONLY
 156 HIDDEN void *
 157 x86_64_r_uc_addr (ucontext_t *uc, int reg)
 158 {
 159   /* NOTE: common_init() in init.h inlines these for fast path access. */
 160   void *addr;
 161
 162   switch (reg)
 163     {
 164     case UNW_X86_64_R8: addr = &uc->uc_mcontext.mc_r8; break;
 165     case UNW_X86_64_R9: addr = &uc->uc_mcontext.mc_r9; break;
 166     case UNW_X86_64_R10: addr = &uc->uc_mcontext.mc_r10; break;
 167     case UNW_X86_64_R11: addr = &uc->uc_mcontext.mc_r11; break;
 168     case UNW_X86_64_R12: addr = &uc->uc_mcontext.mc_r12; break;
 169     case UNW_X86_64_R13: addr = &uc->uc_mcontext.mc_r13; break;
 170     case UNW_X86_64_R14: addr = &uc->uc_mcontext.mc_r14; break;
 171     case UNW_X86_64_R15: addr = &uc->uc_mcontext.mc_r15; break;
 172     case UNW_X86_64_RDI: addr = &uc->uc_mcontext.mc_rdi; break;
 173     case UNW_X86_64_RSI: addr = &uc->uc_mcontext.mc_rsi; break;
 174     case UNW_X86_64_RBP: addr = &uc->uc_mcontext.mc_rbp; break;
 175     case UNW_X86_64_RBX: addr = &uc->uc_mcontext.mc_rbx; break;
 176     case UNW_X86_64_RDX: addr = &uc->uc_mcontext.mc_rdx; break;
 177     case UNW_X86_64_RAX: addr = &uc->uc_mcontext.mc_rax; break;
 178     case UNW_X86_64_RCX: addr = &uc->uc_mcontext.mc_rcx; break;
 179     case UNW_X86_64_RSP: addr = &uc->uc_mcontext.mc_rsp; break;
 180     case UNW_X86_64_RIP: addr = &uc->uc_mcontext.mc_rip; break;
 181
 182     default:
 183       addr = NULL;
 184     }
 185   return addr;
 186 }
 187
 188 HIDDEN NORETURN void
 189 x86_64_sigreturn (unw_cursor_t *cursor)
 190 {
 191   struct cursor *c = (struct cursor *) cursor;
 192   ucontext_t *uc = (ucontext_t *)(c->sigcontext_addr +
 193     offsetof(struct sigframe, sf_uc));
 194
 195   Debug (8, "resuming at ip=%llx via sigreturn(%p)\n",
 196              (unsigned long long) c->dwarf.ip, uc);
 197   sigreturn(uc);
 198   abort();
 199 }
 200 #endif