Mercurial > hg > CbC > CbC_gcc
annotate gcc/config/pa/linux-unwind.h @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* DWARF2 EH unwinding support for PA Linux. |
| 2 Copyright (C) 2004, 2005, 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 | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 3, or (at your option) | |
| 9 any later version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License 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 | |
| 26 /* Do code reading to identify a signal frame, and set the frame | |
| 27 state data appropriately. See unwind-dw2.c for the structs. */ | |
| 28 | |
| 29 /* Don't use this if inhibit_libc is set. | |
| 30 The build for this target will fail trying to include missing headers. */ | |
| 31 #ifndef inhibit_libc | |
| 32 #include <signal.h> | |
| 33 #include <sys/ucontext.h> | |
| 34 | |
| 35 /* Unfortunately, because of various bugs and changes to the kernel, | |
| 36 we have several cases to deal with. | |
| 37 | |
| 38 In 2.4, the signal trampoline is 4 words, and (CONTEXT)->ra should | |
| 39 point directly at the beginning of the trampoline and struct rt_sigframe. | |
| 40 | |
| 41 In <= 2.6.5-rc2-pa3, the signal trampoline is 9 words, and | |
| 42 (CONTEXT)->ra points at the 4th word in the trampoline structure. This | |
| 43 is wrong, it should point at the 5th word. This is fixed in 2.6.5-rc2-pa4. | |
| 44 | |
| 45 To detect these cases, we first take (CONTEXT)->ra, align it to 64-bytes | |
| 46 to get the beginning of the signal frame, and then check offsets 0, 4 | |
| 47 and 5 to see if we found the beginning of the trampoline. This will | |
| 48 tell us how to locate the sigcontext structure. | |
| 49 | |
| 50 Note that with a 2.4 64-bit kernel, the signal context is not properly | |
| 51 passed back to userspace so the unwind will not work correctly. */ | |
| 52 | |
| 53 #define MD_FALLBACK_FRAME_STATE_FOR pa32_fallback_frame_state | |
| 54 | |
| 55 static _Unwind_Reason_Code | |
| 56 pa32_fallback_frame_state (struct _Unwind_Context *context, | |
| 57 _Unwind_FrameState *fs) | |
| 58 { | |
| 59 unsigned long sp = (unsigned long)context->ra & ~63; | |
| 60 unsigned int *pc = (unsigned int *)sp; | |
| 61 unsigned long off; | |
| 62 _Unwind_Ptr new_cfa; | |
| 63 int i; | |
| 64 struct sigcontext *sc; | |
| 65 struct rt_sigframe { | |
| 66 struct siginfo info; | |
| 67 struct ucontext uc; | |
| 68 } *frame; | |
| 69 | |
| 70 /* rt_sigreturn trampoline: | |
| 71 3419000x ldi 0, %r25 or ldi 1, %r25 (x = 0 or 2) | |
| 72 3414015a ldi __NR_rt_sigreturn, %r20 | |
| 73 e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31 | |
| 74 08000240 nop */ | |
| 75 | |
| 76 if (pc[0] == 0x34190000 || pc[0] == 0x34190002) | |
| 77 off = 4*4; | |
| 78 else if (pc[4] == 0x34190000 || pc[4] == 0x34190002) | |
| 79 { | |
| 80 pc += 4; | |
| 81 off = 10 * 4; | |
| 82 } | |
| 83 else if (pc[5] == 0x34190000 || pc[5] == 0x34190002) | |
| 84 { | |
| 85 pc += 5; | |
| 86 off = 10 * 4; | |
| 87 } | |
| 88 else | |
| 89 { | |
| 90 /* We may have to unwind through an alternate signal stack. | |
| 91 We assume that the alignment of the alternate signal stack | |
| 92 is BIGGEST_ALIGNMENT (i.e., that it has been allocated using | |
| 93 malloc). As a result, we can't distinguish trampolines | |
| 94 used prior to 2.6.5-rc2-pa4. However after 2.6.5-rc2-pa4, | |
| 95 the return address of a signal trampoline will be on an odd | |
| 96 word boundary and we can then determine the frame offset. */ | |
| 97 sp = (unsigned long)context->ra; | |
| 98 pc = (unsigned int *)sp; | |
| 99 if ((pc[0] == 0x34190000 || pc[0] == 0x34190002) && (sp & 4)) | |
| 100 off = 5 * 4; | |
| 101 else | |
| 102 return _URC_END_OF_STACK; | |
| 103 } | |
| 104 | |
| 105 if (pc[1] != 0x3414015a | |
| 106 || pc[2] != 0xe4008200 | |
| 107 || pc[3] != 0x08000240) | |
| 108 return _URC_END_OF_STACK; | |
| 109 | |
| 110 frame = (struct rt_sigframe *)(sp + off); | |
| 111 sc = &frame->uc.uc_mcontext; | |
| 112 | |
| 113 new_cfa = sc->sc_gr[30]; | |
| 114 fs->regs.cfa_how = CFA_REG_OFFSET; | |
| 115 fs->regs.cfa_reg = 30; | |
| 116 fs->regs.cfa_offset = new_cfa - (long) context->cfa; | |
| 117 for (i = 1; i <= 31; i++) | |
| 118 { | |
| 119 fs->regs.reg[i].how = REG_SAVED_OFFSET; | |
| 120 fs->regs.reg[i].loc.offset = (long)&sc->sc_gr[i] - new_cfa; | |
| 121 } | |
| 122 for (i = 4; i <= 31; i++) | |
| 123 { | |
| 124 /* FP regs have left and right halves */ | |
| 125 fs->regs.reg[2*i+24].how = REG_SAVED_OFFSET; | |
| 126 fs->regs.reg[2*i+24].loc.offset | |
| 127 = (long)&sc->sc_fr[i] - new_cfa; | |
| 128 fs->regs.reg[2*i+24+1].how = REG_SAVED_OFFSET; | |
| 129 fs->regs.reg[2*i+24+1].loc.offset | |
| 130 = (long)&sc->sc_fr[i] + 4 - new_cfa; | |
| 131 } | |
| 132 fs->regs.reg[88].how = REG_SAVED_OFFSET; | |
| 133 fs->regs.reg[88].loc.offset = (long) &sc->sc_sar - new_cfa; | |
| 134 fs->regs.reg[DWARF_ALT_FRAME_RETURN_COLUMN].how = REG_SAVED_OFFSET; | |
| 135 fs->regs.reg[DWARF_ALT_FRAME_RETURN_COLUMN].loc.offset | |
| 136 = (long) &sc->sc_iaoq[0] - new_cfa; | |
| 137 fs->retaddr_column = DWARF_ALT_FRAME_RETURN_COLUMN; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
138 fs->signal_frame = 1; |
| 0 | 139 return _URC_NO_REASON; |
| 140 } | |
| 141 #endif /* inhibit_libc */ |