Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/s390/linux-unwind.h @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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1 /* DWARF2 EH unwinding support for S/390 Linux. | |
2 Copyright (C) 2004, 2005, 2006, 2009 Free Software Foundation, Inc. | |
3 | |
4 This file is part of GCC. | |
5 | |
6 GCC is free software; you can redistribute it and/or modify it under | |
7 the terms of the GNU General Public License as published by the Free | |
8 Software Foundation; either version 3, or (at your option) any later | |
9 version. | |
10 | |
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 for more details. | |
15 | |
16 Under Section 7 of GPL version 3, you are granted additional | |
17 permissions described in the GCC Runtime Library Exception, version | |
18 3.1, as published by the Free Software Foundation. | |
19 | |
20 You should have received a copy of the GNU General Public License and | |
21 a copy of the GCC Runtime Library Exception along with this program; | |
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 <http://www.gnu.org/licenses/>. */ | |
24 | |
25 /* Do code reading to identify a signal frame, and set the frame | |
26 state data appropriately. See unwind-dw2.c for the structs. */ | |
27 | |
28 #define MD_FALLBACK_FRAME_STATE_FOR s390_fallback_frame_state | |
29 | |
30 static _Unwind_Reason_Code | |
31 s390_fallback_frame_state (struct _Unwind_Context *context, | |
32 _Unwind_FrameState *fs) | |
33 { | |
34 unsigned char *pc = context->ra; | |
35 long new_cfa; | |
36 int i; | |
37 | |
38 typedef struct | |
39 { | |
40 unsigned long psw_mask; | |
41 unsigned long psw_addr; | |
42 unsigned long gprs[16]; | |
43 unsigned int acrs[16]; | |
44 unsigned int fpc; | |
45 unsigned int __pad; | |
46 double fprs[16]; | |
47 } __attribute__ ((__aligned__ (8))) sigregs_; | |
48 | |
49 sigregs_ *regs; | |
50 int *signo; | |
51 | |
52 /* svc $__NR_sigreturn or svc $__NR_rt_sigreturn */ | |
53 if (pc[0] != 0x0a || (pc[1] != 119 && pc[1] != 173)) | |
54 return _URC_END_OF_STACK; | |
55 | |
56 /* Legacy frames: | |
57 old signal mask (8 bytes) | |
58 pointer to sigregs (8 bytes) - points always to next location | |
59 sigregs | |
60 retcode | |
61 This frame layout was used on kernels < 2.6.9 for non-RT frames, | |
62 and on kernels < 2.4.13 for RT frames as well. Note that we need | |
63 to look at RA to detect this layout -- this means that if you use | |
64 sa_restorer to install a different signal restorer on a legacy | |
65 kernel, unwinding from signal frames will not work. */ | |
66 if (context->ra == context->cfa + 16 + sizeof (sigregs_)) | |
67 { | |
68 regs = (sigregs_ *)(context->cfa + 16); | |
69 signo = NULL; | |
70 } | |
71 | |
72 /* New-style RT frame: | |
73 retcode + alignment (8 bytes) | |
74 siginfo (128 bytes) | |
75 ucontext (contains sigregs) */ | |
76 else if (pc[1] == 173 /* __NR_rt_sigreturn */) | |
77 { | |
78 struct ucontext_ | |
79 { | |
80 unsigned long uc_flags; | |
81 struct ucontext_ *uc_link; | |
82 unsigned long uc_stack[3]; | |
83 sigregs_ uc_mcontext; | |
84 } *uc = context->cfa + 8 + 128; | |
85 | |
86 regs = &uc->uc_mcontext; | |
87 signo = context->cfa + sizeof(long); | |
88 } | |
89 | |
90 /* New-style non-RT frame: | |
91 old signal mask (8 bytes) | |
92 pointer to sigregs (followed by signal number) */ | |
93 else | |
94 { | |
95 regs = *(sigregs_ **)(context->cfa + 8); | |
96 signo = (int *)(regs + 1); | |
97 } | |
98 | |
99 new_cfa = regs->gprs[15] + 16*sizeof(long) + 32; | |
100 fs->regs.cfa_how = CFA_REG_OFFSET; | |
101 fs->regs.cfa_reg = 15; | |
102 fs->regs.cfa_offset = | |
103 new_cfa - (long) context->cfa + 16*sizeof(long) + 32; | |
104 | |
105 for (i = 0; i < 16; i++) | |
106 { | |
107 fs->regs.reg[i].how = REG_SAVED_OFFSET; | |
108 fs->regs.reg[i].loc.offset = | |
109 (long)®s->gprs[i] - new_cfa; | |
110 } | |
111 for (i = 0; i < 16; i++) | |
112 { | |
113 fs->regs.reg[16+i].how = REG_SAVED_OFFSET; | |
114 fs->regs.reg[16+i].loc.offset = | |
115 (long)®s->fprs[i] - new_cfa; | |
116 } | |
117 | |
118 /* Load return addr from PSW into dummy register 32. */ | |
119 | |
120 fs->regs.reg[32].how = REG_SAVED_OFFSET; | |
121 fs->regs.reg[32].loc.offset = (long)®s->psw_addr - new_cfa; | |
122 fs->retaddr_column = 32; | |
123 /* SIGILL, SIGFPE and SIGTRAP are delivered with psw_addr | |
124 after the faulting instruction rather than before it. | |
125 Don't set FS->signal_frame in that case. */ | |
126 if (!signo || (*signo != 4 && *signo != 5 && *signo != 8)) | |
127 fs->signal_frame = 1; | |
128 | |
129 return _URC_NO_REASON; | |
130 } |