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