1 /* Definitions to make GDB run on an Alpha box under Linux. The 2 definitions here are used when the _target_ system is running Linux. 3 Copyright 1996 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21 #ifndef TM_LINUXALPHA_H 22 #define TM_LINUXALPHA_H 23 24 #include "alpha/tm-alpha.h" 25 26 /* Are we currently handling a signal ? */ 27 28 extern long alpha_linux_sigtramp_offset PARAMS ((CORE_ADDR); 29 #undef IN_SIGTRAMP 30 #define IN_SIGTRAMP(pc, name) (alpha_linux_sigtramp_offset (pc) >= 0) 31 32 /* Get start and end address of sigtramp handler. */ 33 34 #define SIGTRAMP_START(pc) (pc - alpha_linux_sigtramp_offset (pc)) 35 #define SIGTRAMP_END(pc) (SIGTRAMP_START(pc) + 3*4) 36 37 38 /* Number of traps that happen between exec'ing the shell to run an 39 inferior, and when we finally get to the inferior code. This is 2 40 on Linux and most implementations. */ 41 42 #undef START_INFERIOR_TRAPS_EXPECTED 43 #define START_INFERIOR_TRAPS_EXPECTED 2 44 45 /* Return TRUE if procedure descriptor PROC is a procedure descriptor 46 that refers to a dynamically generated sigtramp function. */ 47 48 #undef PROC_DESC_IS_DYN_SIGTRAMP 49 #define PROC_SIGTRAMP_MAGIC 0x0e0f0f0f 50 #define PROC_DESC_IS_DYN_SIGTRAMP(proc) ((proc)->pdr.isym \ 51 == PROC_SIGTRAMP_MAGIC) 52 #undef SET_PROC_DESC_IS_DYN_SIGTRAMP 53 #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc) ((proc)->pdr.isym \ 54 = PROC_SIGTRAMP_MAGIC) 55 56 /* If PC is inside a dynamically generated sigtramp function, return 57 how many bytes the program counter is beyond the start of that 58 function. Otherwise, return a negative value. */ 59 60 #undef DYNAMIC_SIGTRAMP_OFFSET 61 #define DYNAMIC_SIGTRAMP_OFFSET(pc) (alpha_linux_sigtramp_offset (pc)) 62 63 /* Translate a signal handler frame into the address of the sigcontext 64 structure. */ 65 66 #undef SIGCONTEXT_ADDR 67 #define SIGCONTEXT_ADDR(frame) ((frame)->frame - 0x298) 68 69 /* If FRAME refers to a sigtramp frame, return the address of the next frame. 70 71 Under Linux, sigtramp handlers have dynamically generated procedure 72 descriptors that make this hack unnecessary. */ 73 74 #undef FRAME_PAST_SIGTRAMP_FRAME 75 #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc) (0) 76 77 #endif /* TM_LINUXALPHA_H */ 78