projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| dd552284 WL |
1 | /* DWARF2 EH unwinding support for TILEPro. |
| 2 | Copyright (C) 2011, 2012 | |
| 3 | Free Software Foundation, Inc. | |
| 4 | Contributed by Walter Lee (walt@tilera.com) | |
| 5 | ||
| 6 | This file is part of GCC. | |
| 7 | ||
| 8 | GCC is free software; you can redistribute it and/or modify | |
| 9 | it under the terms of the GNU General Public License as published by | |
| 10 | the Free Software Foundation; either version 3, or (at your option) | |
| 11 | any later version. | |
| 12 | ||
| 13 | GCC is distributed in the hope that it will be useful, | |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | GNU General Public License for more details. | |
| 17 | ||
| 18 | Under Section 7 of GPL version 3, you are granted additional | |
| 19 | permissions described in the GCC Runtime Library Exception, version | |
| 20 | 3.1, as published by the Free Software Foundation. | |
| 21 | ||
| 22 | You should have received a copy of the GNU General Public License and | |
| 23 | a copy of the GCC Runtime Library Exception along with this program; | |
| 24 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 25 | <http://www.gnu.org/licenses/>. */ | |
| 26 | ||
| 27 | #ifndef inhibit_libc | |
| 28 | ||
| 29 | #include <arch/abi.h> | |
| 30 | #include <signal.h> | |
| 31 | #include <sys/ucontext.h> | |
| 32 | #include <linux/unistd.h> | |
| 33 | ||
| 34 | /* Macro to define a copy of the kernel's __rt_sigreturn function | |
| 35 | (in arch/tile/kernel/entry.S). If that function is changed, | |
| 36 | this one needs to be changed to match it. */ | |
| 37 | #define _sigreturn_asm(REG, NR) asm( \ | |
| 38 | ".pushsection .text.__rt_sigreturn,\"a\"\n" \ | |
| 39 | ".global __rt_sigreturn\n" \ | |
| 40 | ".type __rt_sigreturn,@function\n" \ | |
| 41 | "__rt_sigreturn:\n" \ | |
| 42 | "moveli " #REG ", " #NR "\n" \ | |
| 43 | "swint1\n" \ | |
| 44 | ".size __rt_sigreturn, . - __rt_sigreturn\n" \ | |
| 45 | ".popsection") | |
| 46 | #define sigreturn_asm(REG, NR) _sigreturn_asm(REG, NR) | |
| 47 | sigreturn_asm (TREG_SYSCALL_NR_NAME, __NR_rt_sigreturn); | |
| 48 | #define SIGRETURN_LEN 16 | |
| 49 | extern char __rt_sigreturn[]; | |
| 50 | ||
| 51 | #define MD_FALLBACK_FRAME_STATE_FOR tile_fallback_frame_state | |
| 52 | ||
| 53 | static _Unwind_Reason_Code | |
| 54 | tile_fallback_frame_state (struct _Unwind_Context *context, | |
| 55 | _Unwind_FrameState *fs) | |
| 56 | { | |
| 57 | unsigned char *pc = context->ra; | |
| 58 | struct sigcontext *sc; | |
| 59 | long new_cfa; | |
| 60 | int i; | |
| 61 | ||
| 62 | struct rt_sigframe { | |
| 63 | unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; | |
| 64 | struct siginfo info; | |
| 65 | struct ucontext uc; | |
| 66 | } *rt_; | |
| 67 | ||
| 68 | /* Return if this is not a signal handler. */ | |
| 69 | if (memcmp (pc, __rt_sigreturn, SIGRETURN_LEN) != 0) | |
| 70 | return _URC_END_OF_STACK; | |
| 71 | ||
| 72 | /* It was a signal handler; update the reported PC to point to our | |
| 73 | copy, since that will be findable with dladdr() and therefore | |
| 74 | somewhat easier to help understand what actually happened. */ | |
| 75 | context->ra = __rt_sigreturn; | |
| 76 | ||
| 77 | rt_ = context->cfa; | |
| 78 | sc = &rt_->uc.uc_mcontext; | |
| 79 | ||
| 80 | new_cfa = sc->sp; | |
| 81 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
| 82 | fs->regs.cfa_reg = STACK_POINTER_REGNUM; | |
| 83 | fs->regs.cfa_offset = new_cfa - (long) context->cfa; | |
| 84 | ||
| 85 | for (i = 0; i < 56; ++i) | |
| 86 | { | |
| 87 | fs->regs.reg[i].how = REG_SAVED_OFFSET; | |
| 88 | fs->regs.reg[i].loc.offset | |
| 89 | = (long)&sc->gregs[i] - new_cfa; | |
| 90 | } | |
| 91 | ||
| 92 | fs->regs.reg[56].how = REG_SAVED_OFFSET; | |
| 93 | fs->regs.reg[56].loc.offset = (long)&sc->pc - new_cfa; | |
| 94 | fs->retaddr_column = 56; | |
| 95 | fs->signal_frame = 1; | |
| 96 | ||
| 97 | return _URC_NO_REASON; | |
| 98 | } | |
| 99 | ||
| 100 | #endif /* ifdef inhibit_libc */ |