| 1 | /* nullmon.c - Stub or monitor services. |
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| 2 | * |
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| 3 | * Copyright (c) 1998 Cygnus Support |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |
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| 16 | /* This is a ROMSTUB |
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| 17 | Various libraries in libgloss may reference board specific services. |
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| 18 | These are often performed by system calls and by rom specific |
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| 19 | interfaces such as dvemon.c This file defines the null interface in |
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| 20 | which the rom monitor either does not exist or is not used. |
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| 21 | Linking with this file supports applications which only exercise |
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| 22 | the processor, specifically, the GDB test suite. |
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| 23 | By linking this object in rather than a monitor specific support |
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| 24 | we can insure that the testsuite will run without references or |
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| 25 | linkages to nonexistent monitor services. |
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| 26 | Similarly, every service provided by this file muse be provided by all |
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| 27 | monitor speciifc interfaces. |
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| 28 | PLEASE DO NOT MAKE THIS FILE SPECIFIC TO ANY MONITOR |
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| 29 | */ |
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| 30 | |
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| 31 | /* This form is giving linker relocation errors */ |
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| 32 | #if ! defined(BOARD_MEM_SIZE) |
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| 33 | #define BOARD_MEM_SIZE 0x100000 /* About a megabyte */ |
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| 34 | #endif |
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| 35 | extern char _ftext[]; /* Defined in nullmon.ld */ |
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| 36 | extern char _end[]; /* Defined in nullmon.ld */ |
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| 37 | |
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| 38 | #if defined(FIXME_WARNINGS) |
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| 39 | #warning("FIXME: struct s_mem belongs in a header file") |
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| 40 | #endif |
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| 41 | struct s_mem |
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| 42 | { unsigned int size; |
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| 43 | unsigned int icsize; |
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| 44 | unsigned int dcsize; |
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| 45 | }; |
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| 46 | |
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| 47 | void |
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| 48 | get_mem_info (mem) |
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| 49 | struct s_mem *mem; |
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| 50 | { |
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| 51 | mem->size = BOARD_MEM_SIZE - (_end - _ftext); |
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| 52 | } |
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| 53 | |
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| 54 | /* SYSTEM INTERFACE |
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| 55 | Since we are defining a NULL operating environment here, I am |
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| 56 | entering the stub definitions for the GNUpro libraries, System Calls. |
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| 57 | I would rather not to even pretend to support these functions but, they |
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| 58 | get pulled in by other libraries. |
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| 59 | */ |
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| 60 | |
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| 61 | int read(int file, char * ptr , int len) { return 0 ; } |
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| 62 | int close (int file) { return -1 ; } |
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| 63 | int write(int file , char * ptr, int len) { return 0 ; } |
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| 64 | /*eof*/ |
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