1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2002 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5   Modified for x86_64 by Max Asbock <masbock@us.ibm.com>
6
7This file is part of libunwind.
8
9Permission is hereby granted, free of charge, to any person obtaining
10a copy of this software and associated documentation files (the
11"Software"), to deal in the Software without restriction, including
12without limitation the rights to use, copy, modify, merge, publish,
13distribute, sublicense, and/or sell copies of the Software, and to
14permit persons to whom the Software is furnished to do so, subject to
15the following conditions:
16
17The above copyright notice and this permission notice shall be
18included in all copies or substantial portions of the Software.
19
20THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
27
28#include "unwind_i.h"
29
30/* Avoid a trip to x86_64_r_uc_addr() for purely local initialisation. */
31#if defined UNW_LOCAL_ONLY && defined __linux
32# define REG_INIT_LOC(c, rlc, ruc) \
33    DWARF_LOC ((unw_word_t) &c->uc->uc_mcontext.gregs[REG_ ## ruc], 0)
34
35#elif defined UNW_LOCAL_ONLY && defined __FreeBSD__
36# define REG_INIT_LOC(c, rlc, ruc) \
37    DWARF_LOC ((unw_word_t) &c->uc->uc_mcontext.mc_ ## rlc, 0)
38
39#else
40# define REG_INIT_LOC(c, rlc, ruc) \
41    DWARF_REG_LOC (&c->dwarf, UNW_X86_64_ ## ruc)
42#endif
43
44static inline int
45common_init (struct cursor *c, unsigned use_prev_instr)
46{
47  int ret;
48
49  c->dwarf.loc[RAX] = REG_INIT_LOC(c, rax, RAX);
50  c->dwarf.loc[RDX] = REG_INIT_LOC(c, rdx, RDX);
51  c->dwarf.loc[RCX] = REG_INIT_LOC(c, rcx, RCX);
52  c->dwarf.loc[RBX] = REG_INIT_LOC(c, rbx, RBX);
53  c->dwarf.loc[RSI] = REG_INIT_LOC(c, rsi, RSI);
54  c->dwarf.loc[RDI] = REG_INIT_LOC(c, rdi, RDI);
55  c->dwarf.loc[RBP] = REG_INIT_LOC(c, rbp, RBP);
56  c->dwarf.loc[RSP] = REG_INIT_LOC(c, rsp, RSP);
57  c->dwarf.loc[R8]  = REG_INIT_LOC(c, r8,  R8);
58  c->dwarf.loc[R9]  = REG_INIT_LOC(c, r9,  R9);
59  c->dwarf.loc[R10] = REG_INIT_LOC(c, r10, R10);
60  c->dwarf.loc[R11] = REG_INIT_LOC(c, r11, R11);
61  c->dwarf.loc[R12] = REG_INIT_LOC(c, r12, R12);
62  c->dwarf.loc[R13] = REG_INIT_LOC(c, r13, R13);
63  c->dwarf.loc[R14] = REG_INIT_LOC(c, r14, R14);
64  c->dwarf.loc[R15] = REG_INIT_LOC(c, r15, R15);
65  c->dwarf.loc[RIP] = REG_INIT_LOC(c, rip, RIP);
66
67  ret = dwarf_get (&c->dwarf, c->dwarf.loc[RIP], &c->dwarf.ip);
68  if (ret < 0)
69    return ret;
70
71  ret = dwarf_get (&c->dwarf, DWARF_REG_LOC (&c->dwarf, UNW_X86_64_RSP),
72		   &c->dwarf.cfa);
73  if (ret < 0)
74    return ret;
75
76  c->sigcontext_format = X86_64_SCF_NONE;
77  c->sigcontext_addr = 0;
78
79  c->dwarf.args_size = 0;
80  c->dwarf.ret_addr_column = RIP;
81  c->dwarf.stash_frames = 0;
82  c->dwarf.use_prev_instr = use_prev_instr;
83  c->dwarf.pi_valid = 0;
84  c->dwarf.pi_is_dynamic = 0;
85  c->dwarf.hint = 0;
86  c->dwarf.prev_rs = 0;
87  /* ANDROID support update. */
88  c->dwarf.frame = 0;
89  /* End of ANDROID update. */
90
91  return 0;
92}
93