1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2002-2003 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
7 This file is part of libunwind.
8
9 Permission is hereby granted, free of charge, to any person obtaining
10 a copy of this software and associated documentation files (the
11 "Software"), to deal in the Software without restriction, including
12 without limitation the rights to use, copy, modify, merge, publish,
13 distribute, sublicense, and/or sell copies of the Software, and to
14 permit persons to whom the Software is furnished to do so, subject to
15 the following conditions:
16
17 The above copyright notice and this permission notice shall be
18 included in all copies or substantial portions of the Software.
19
20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
27
28 #include "unwind_i.h"
29 #include "ucontext_i.h"
30
31 #include <sys/syscall.h>
32
33 struct sigframe {
34 uint64_t signo;
35 uint64_t sip;
36 };
37
38 int
unw_is_signal_frame(unw_cursor_t * cursor)39 unw_is_signal_frame (unw_cursor_t *cursor)
40 {
41 struct cursor *c = (struct cursor *) cursor;
42
43 c->sigcontext_format = (c->dwarf.ip == (unw_word_t)-1) ?
44 X86_64_SCF_SOLARIS_SIGFRAME : X86_64_SCF_NONE;
45
46 return (c->sigcontext_format);
47 }
48
49 HIDDEN int
x86_64_handle_signal_frame(unw_cursor_t * cursor)50 x86_64_handle_signal_frame (unw_cursor_t *cursor)
51 {
52 struct cursor *c = (struct cursor *) cursor;
53 unw_word_t ucontext = c->dwarf.cfa + sizeof (struct sigframe);
54 int i;
55
56 if (c->sigcontext_format != X86_64_SCF_SOLARIS_SIGFRAME)
57 return -UNW_EBADFRAME;
58
59 c->sigcontext_addr = c->dwarf.cfa;
60
61 Debug(1, "signal frame cfa = %lx ucontext = %lx\n",
62 (uint64_t)c->dwarf.cfa, (uint64_t)ucontext);
63
64 struct dwarf_loc rsp_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RSP, 0);
65 int ret = dwarf_get (&c->dwarf, rsp_loc, &c->dwarf.cfa);
66
67 if (ret < 0)
68 {
69 Debug (2, "return %d\n", ret);
70 return ret;
71 }
72
73 for (i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i)
74 c->dwarf.loc[i] = DWARF_NULL_LOC;
75
76 c->dwarf.loc[RAX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RAX, 0);
77 c->dwarf.loc[RDX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RDX, 0);
78 c->dwarf.loc[RCX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RCX, 0);
79 c->dwarf.loc[RBX] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RBX, 0);
80 c->dwarf.loc[RSI] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RSI, 0);
81 c->dwarf.loc[RDI] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RDI, 0);
82 c->dwarf.loc[RBP] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RBP, 0);
83 c->dwarf.loc[RSP] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RSP, 0);
84 c->dwarf.loc[ R8] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R8, 0);
85 c->dwarf.loc[ R9] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R9, 0);
86 c->dwarf.loc[R10] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R10, 0);
87 c->dwarf.loc[R11] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R11, 0);
88 c->dwarf.loc[R12] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R12, 0);
89 c->dwarf.loc[R13] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R13, 0);
90 c->dwarf.loc[R14] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R14, 0);
91 c->dwarf.loc[R15] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R15, 0);
92 c->dwarf.loc[RIP] = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_RIP, 0);
93
94 c->dwarf.use_prev_instr = 1;
95 return 0;
96 }
97
98 #ifndef UNW_REMOTE_ONLY
99 HIDDEN void *
x86_64_r_uc_addr(ucontext_t * uc,int reg)100 x86_64_r_uc_addr (ucontext_t *uc, int reg)
101 {
102 /* NOTE: common_init() in init.h inlines these for fast path access. */
103 void *addr;
104
105 switch (reg)
106 {
107 case UNW_X86_64_R8: addr = &uc->uc_mcontext.gregs[REG_R8]; break;
108 case UNW_X86_64_R9: addr = &uc->uc_mcontext.gregs[REG_R9]; break;
109 case UNW_X86_64_R10: addr = &uc->uc_mcontext.gregs[REG_R10]; break;
110 case UNW_X86_64_R11: addr = &uc->uc_mcontext.gregs[REG_R11]; break;
111 case UNW_X86_64_R12: addr = &uc->uc_mcontext.gregs[REG_R12]; break;
112 case UNW_X86_64_R13: addr = &uc->uc_mcontext.gregs[REG_R13]; break;
113 case UNW_X86_64_R14: addr = &uc->uc_mcontext.gregs[REG_R14]; break;
114 case UNW_X86_64_R15: addr = &uc->uc_mcontext.gregs[REG_R15]; break;
115 case UNW_X86_64_RDI: addr = &uc->uc_mcontext.gregs[REG_RDI]; break;
116 case UNW_X86_64_RSI: addr = &uc->uc_mcontext.gregs[REG_RSI]; break;
117 case UNW_X86_64_RBP: addr = &uc->uc_mcontext.gregs[REG_RBP]; break;
118 case UNW_X86_64_RBX: addr = &uc->uc_mcontext.gregs[REG_RBX]; break;
119 case UNW_X86_64_RDX: addr = &uc->uc_mcontext.gregs[REG_RDX]; break;
120 case UNW_X86_64_RAX: addr = &uc->uc_mcontext.gregs[REG_RAX]; break;
121 case UNW_X86_64_RCX: addr = &uc->uc_mcontext.gregs[REG_RCX]; break;
122 case UNW_X86_64_RSP: addr = &uc->uc_mcontext.gregs[REG_RSP]; break;
123 case UNW_X86_64_RIP: addr = &uc->uc_mcontext.gregs[REG_RIP]; break;
124
125 default:
126 addr = NULL;
127 }
128 return addr;
129 }
130
131 HIDDEN NORETURN void
x86_64_sigreturn(unw_cursor_t * cursor)132 x86_64_sigreturn (unw_cursor_t *cursor)
133 {
134 abort();
135 }
136
137 #endif
138