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 | ||
| 24 | #include <stdio.h> | |
| 25 | #include "defs.h" | |
| 26 | #include "param.h" | |
| 27 | #include "symtab.h" | |
| 28 | #include "frame.h" | |
| 29 | ||
| 30 | /* 'start_frame' is a variable in the NINDY runtime startup routine | |
| 31 | that contains the frame pointer of the 'start' routine (the routine | |
| 32 | that calls 'main'). By reading its contents out of remote memory, | |
| 33 | we can tell where the frame chain ends: backtraces should halt before | |
| 34 | they display this frame. */ | |
| 35 | ||
| 36 | int | |
| 37 | nindy_frame_chain_valid (chain, curframe) | |
| 38 | unsigned int chain; | |
| 39 | FRAME curframe; | |
| 40 | { | |
| 41 | struct symbol *sym; | |
| 42 | int i; | |
| 43 | ||
| 44 | /* crtnindy.o is an assembler module that is assumed to be linked | |
| 45 | * first in an i80960 executable. It contains the true entry point; | |
| 46 | * it performs startup up initialization and then calls 'main'. | |
| 47 | * | |
| 48 | * 'sf' is the name of a variable in crtnindy.o that is set | |
| 49 | * during startup to the address of the first frame. | |
| 50 | * | |
| 51 | * 'a' is the address of that variable in 80960 memory. | |
| 52 | */ | |
| 53 | static char sf[] = "start_frame"; | |
| 54 | CORE_ADDR a; | |
| 55 | ||
| 56 | ||
| 57 | chain &= ~0x3f; /* Zero low 6 bits because previous frame pointers | |
| 58 | contain return status info in them. */ | |
| 59 | if ( chain == 0 ){ | |
| 60 | return 0; | |
| 61 | } | |
| 62 | ||
| 63 | sym = lookup_symbol(sf, 0, VAR_NAMESPACE, (int *)NULL, | |
| 64 | (struct symtab **)NULL); | |
| 65 | if ( sym != 0 ){ | |
| 66 | a = sym->value.value; | |
| 67 | } else { | |
| a65bb55d JG |
68 | i = lookup_misc_func (sf); |
| 69 | if (i < 0) | |
| 70 | return 0; | |
| dd3b648e RP |
71 | a = misc_function_vector[i].address; |
| 72 | } | |
| 73 | ||
| 74 | return ( chain != read_memory_integer(a,4) ); | |
| 75 | } |