projects / binutils.git / blame
| Commit | Line | Data |
|---|---|---|
| 5076de82 FF |
1 | /* Macro definitions for i386 running under BSD Unix. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of GDB. | |
| 5 | ||
| 6 | This program 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 2 of the License, or | |
| 9 | (at your option) any later version. | |
| 10 | ||
| 11 | This program 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 | You should have received a copy of the GNU General Public License | |
| 17 | along with this program; if not, write to the Free Software | |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | /* Override number of expected traps from sysv. */ | |
| 21 | #define START_INFERIOR_TRAPS_EXPECTED 2 | |
| 22 | ||
| 23 | /* Most definitions from sysv could be used. */ | |
| 24 | #include "i386/tm-i386v.h" | |
| 25 | ||
| 26 | /* 386BSD cannot handle the segment registers. */ | |
| a824e46e | 27 | /* BSDI can't handle them either. */ |
| 5076de82 | 28 | #undef NUM_REGS |
| a824e46e | 29 | #define NUM_REGS 10 |
| 7b98a091 PS |
30 | |
| 31 | /* On 386 bsd, sigtramp is above the user stack and immediately below | |
| 32 | the user area. Using constants here allows for cross debugging. | |
| 33 | These are tested for BSDI but should work on 386BSD. */ | |
| 34 | #define SIGTRAMP_START 0xfdbfdfc0 | |
| 35 | #define SIGTRAMP_END 0xfdbfe000 | |
| 36 | ||
| 37 | /* The following redefines make backtracing through sigtramp work. | |
| 38 | They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp | |
| 39 | from the sigcontext structure which is pushed by the kernel on the | |
| 40 | user stack, along with a pointer to it. */ | |
| 41 | ||
| 42 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
| 43 | chain-pointer. | |
| 44 | In the case of the i386, the frame's nominal address | |
| 45 | is the address of a 4-byte word containing the calling frame's address. */ | |
| 46 | #undef FRAME_CHAIN | |
| 47 | #define FRAME_CHAIN(thisframe) \ | |
| 48 | (thisframe->signal_handler_caller \ | |
| 49 | ? thisframe->frame \ | |
| 50 | : (!inside_entry_file ((thisframe)->pc) \ | |
| 51 | ? read_memory_integer ((thisframe)->frame, 4) \ | |
| 52 | : 0)) | |
| 53 | ||
| 54 | /* A macro that tells us whether the function invocation represented | |
| 55 | by FI does not have a frame on the stack associated with it. If it | |
| 56 | does not, FRAMELESS is set to 1, else 0. */ | |
| 57 | #undef FRAMELESS_FUNCTION_INVOCATION | |
| 58 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
| 59 | do { \ | |
| 60 | if ((FI)->signal_handler_caller) \ | |
| 61 | (FRAMELESS) = 0; \ | |
| 62 | else \ | |
| 63 | (FRAMELESS) = frameless_look_for_prologue(FI); \ | |
| 64 | } while (0) | |
| 65 | ||
| 66 | /* Saved Pc. Get it from sigcontext if within sigtramp. */ | |
| 67 | ||
| 68 | /* Offset to saved PC in sigcontext, from <sys/signal.h>. */ | |
| 69 | #define SIGCONTEXT_PC_OFFSET 20 | |
| 70 | ||
| 71 | #undef FRAME_SAVED_PC(FRAME) | |
| 72 | #define FRAME_SAVED_PC(FRAME) \ | |
| 73 | (((FRAME)->signal_handler_caller \ | |
| 74 | ? sigtramp_saved_pc (FRAME) \ | |
| 75 | : read_memory_integer ((FRAME)->frame + 4, 4)) \ | |
| 76 | ) |