projects / binutils.git / blame
| Commit | Line | Data |
|---|---|---|
| dd3b648e RP |
1 | /* Target-machine dependent code for the NINDY monitor running on the Intel 960 |
| 2 | Copyright (C) 1991 Free Software Foundation, Inc. | |
| 3 | Contributed by Intel Corporation. | |
| 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 | |
| 99a7de40 JG |
9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. | |
| dd3b648e RP |
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 | |
| 99a7de40 JG |
18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| dd3b648e RP |
20 | |
| 21 | /* Miscellaneous NINDY-dependent routines. | |
| 22 | Some replace macros normally defined in "tm.h". */ | |
| 23 | ||
| dd3b648e | 24 | #include "defs.h" |
| dd3b648e RP |
25 | #include "symtab.h" |
| 26 | #include "frame.h" | |
| 27 | ||
| 28 | /* 'start_frame' is a variable in the NINDY runtime startup routine | |
| 29 | that contains the frame pointer of the 'start' routine (the routine | |
| 30 | that calls 'main'). By reading its contents out of remote memory, | |
| 31 | we can tell where the frame chain ends: backtraces should halt before | |
| 32 | they display this frame. */ | |
| 33 | ||
| 34 | int | |
| 35 | nindy_frame_chain_valid (chain, curframe) | |
| 36 | unsigned int chain; | |
| 37 | FRAME curframe; | |
| 38 | { | |
| 39 | struct symbol *sym; | |
| 1ab3bf1b | 40 | struct minimal_symbol *msymbol; |
| dd3b648e RP |
41 | |
| 42 | /* crtnindy.o is an assembler module that is assumed to be linked | |
| 43 | * first in an i80960 executable. It contains the true entry point; | |
| 44 | * it performs startup up initialization and then calls 'main'. | |
| 45 | * | |
| 46 | * 'sf' is the name of a variable in crtnindy.o that is set | |
| 47 | * during startup to the address of the first frame. | |
| 48 | * | |
| 49 | * 'a' is the address of that variable in 80960 memory. | |
| 50 | */ | |
| 51 | static char sf[] = "start_frame"; | |
| 52 | CORE_ADDR a; | |
| 53 | ||
| 54 | ||
| 55 | chain &= ~0x3f; /* Zero low 6 bits because previous frame pointers | |
| 56 | contain return status info in them. */ | |
| 57 | if ( chain == 0 ){ | |
| 58 | return 0; | |
| 59 | } | |
| 60 | ||
| 61 | sym = lookup_symbol(sf, 0, VAR_NAMESPACE, (int *)NULL, | |
| 62 | (struct symtab **)NULL); | |
| 63 | if ( sym != 0 ){ | |
| d41187ef | 64 | a = SYMBOL_VALUE (sym); |
| dd3b648e | 65 | } else { |
| 1ab3bf1b JG |
66 | msymbol = lookup_minimal_symbol (sf, (struct objfile *) NULL); |
| 67 | if (msymbol == NULL) | |
| a65bb55d | 68 | return 0; |
| 81028ab0 | 69 | a = SYMBOL_VALUE_ADDRESS (msymbol); |
| dd3b648e RP |
70 | } |
| 71 | ||
| 72 | return ( chain != read_memory_integer(a,4) ); | |
| 73 | } |