linux-unwind.h revision 1.1.1.1
1/* DWARF2 EH unwinding support for SPARC Linux. 2 Copyright 2004, 2005 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11In addition to the permissions in the GNU General Public License, the 12Free Software Foundation gives you unlimited permission to link the 13compiled version of this file with other programs, and to distribute 14those programs without any restriction coming from the use of this 15file. (The General Public License restrictions do apply in other 16respects; for example, they cover modification of the file, and 17distribution when not linked into another program.) 18 19GCC is distributed in the hope that it will be useful, 20but WITHOUT ANY WARRANTY; without even the implied warranty of 21MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22GNU General Public License for more details. 23 24You should have received a copy of the GNU General Public License 25along with GCC; see the file COPYING. If not, write to 26the Free Software Foundation, 51 Franklin Street, Fifth Floor, 27Boston, MA 02110-1301, USA. */ 28 29/* Do code reading to identify a signal frame, and set the frame 30 state data appropriately. See unwind-dw2.c for the structs. */ 31 32/* Handle multilib correctly. */ 33#if defined(__arch64__) 34 35/* 64-bit SPARC version */ 36#define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state 37 38static _Unwind_Reason_Code 39sparc64_fallback_frame_state (struct _Unwind_Context *context, 40 _Unwind_FrameState *fs) 41{ 42 unsigned int *pc = context->ra; 43 long new_cfa, i; 44 long regs_off, fpu_save_off; 45 long this_cfa, fpu_save; 46 47 if (pc[0] != 0x82102065 /* mov NR_rt_sigreturn, %g1 */ 48 || pc[1] != 0x91d0206d) /* ta 0x6d */ 49 return _URC_END_OF_STACK; 50 regs_off = 192 + 128; 51 fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4); 52 this_cfa = (long) context->cfa; 53 new_cfa = *(long *)((context->cfa) + (regs_off + (14 * 8))); 54 new_cfa += 2047; /* Stack bias */ 55 fpu_save = *(long *)((this_cfa) + (fpu_save_off)); 56 fs->cfa_how = CFA_REG_OFFSET; 57 fs->cfa_reg = 14; 58 fs->cfa_offset = new_cfa - (long) context->cfa; 59 for (i = 1; i < 16; ++i) 60 { 61 fs->regs.reg[i].how = REG_SAVED_OFFSET; 62 fs->regs.reg[i].loc.offset = 63 this_cfa + (regs_off + (i * 8)) - new_cfa; 64 } 65 for (i = 0; i < 16; ++i) 66 { 67 fs->regs.reg[i + 16].how = REG_SAVED_OFFSET; 68 fs->regs.reg[i + 16].loc.offset = 69 this_cfa + (i * 8) - new_cfa; 70 } 71 if (fpu_save) 72 { 73 for (i = 0; i < 64; ++i) 74 { 75 if (i > 32 && (i & 0x1)) 76 continue; 77 fs->regs.reg[i + 32].how = REG_SAVED_OFFSET; 78 fs->regs.reg[i + 32].loc.offset = 79 (fpu_save + (i * 4)) - new_cfa; 80 } 81 } 82 /* Stick return address into %g0, same trick Alpha uses. */ 83 fs->regs.reg[0].how = REG_SAVED_OFFSET; 84 fs->regs.reg[0].loc.offset = 85 this_cfa + (regs_off + (16 * 8) + 8) - new_cfa; 86 fs->retaddr_column = 0; 87 return _URC_NO_REASON; 88} 89 90#else 91 92/* 32-bit SPARC version */ 93#define MD_FALLBACK_FRAME_STATE_FOR sparc_fallback_frame_state 94 95static _Unwind_Reason_Code 96sparc_fallback_frame_state (struct _Unwind_Context *context, 97 _Unwind_FrameState *fs) 98{ 99 unsigned int *pc = context->ra; 100 int new_cfa, i, oldstyle; 101 int regs_off, fpu_save_off; 102 int fpu_save, this_cfa; 103 104 if (pc[1] != 0x91d02010) /* ta 0x10 */ 105 return _URC_END_OF_STACK; 106 if (pc[0] == 0x821020d8) /* mov NR_sigreturn, %g1 */ 107 oldstyle = 1; 108 else if (pc[0] == 0x82102065) /* mov NR_rt_sigreturn, %g1 */ 109 oldstyle = 0; 110 else 111 return _URC_END_OF_STACK; 112 if (oldstyle) 113 { 114 regs_off = 96; 115 fpu_save_off = regs_off + (4 * 4) + (16 * 4); 116 } 117 else 118 { 119 regs_off = 96 + 128; 120 fpu_save_off = regs_off + (4 * 4) + (16 * 4) + (2 * 4); 121 } 122 this_cfa = (int) context->cfa; 123 new_cfa = *(int *)((context->cfa) + (regs_off+(4*4)+(14 * 4))); 124 fpu_save = *(int *)((this_cfa) + (fpu_save_off)); 125 fs->cfa_how = CFA_REG_OFFSET; 126 fs->cfa_reg = 14; 127 fs->cfa_offset = new_cfa - (int) context->cfa; 128 for (i = 1; i < 16; ++i) 129 { 130 if (i == 14) 131 continue; 132 fs->regs.reg[i].how = REG_SAVED_OFFSET; 133 fs->regs.reg[i].loc.offset = 134 this_cfa + (regs_off+(4 * 4)+(i * 4)) - new_cfa; 135 } 136 for (i = 0; i < 16; ++i) 137 { 138 fs->regs.reg[i + 16].how = REG_SAVED_OFFSET; 139 fs->regs.reg[i + 16].loc.offset = 140 this_cfa + (i * 4) - new_cfa; 141 } 142 if (fpu_save) 143 { 144 for (i = 0; i < 32; ++i) 145 { 146 fs->regs.reg[i + 32].how = REG_SAVED_OFFSET; 147 fs->regs.reg[i + 32].loc.offset = 148 (fpu_save + (i * 4)) - new_cfa; 149 } 150 } 151 /* Stick return address into %g0, same trick Alpha uses. */ 152 fs->regs.reg[0].how = REG_SAVED_OFFSET; 153 fs->regs.reg[0].loc.offset = this_cfa+(regs_off+4)-new_cfa; 154 fs->retaddr_column = 0; 155 return _URC_NO_REASON; 156} 157 158#endif 159