[ac7d5ef0] | 1 | /* |
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[88d594a] | 2 | * @(#)newlibc.c 1.9 - 95/05/16 |
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[ac7d5ef0] | 3 | * |
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| 4 | */ |
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| 5 | |
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| 6 | #if defined(RTEMS_NEWLIB) |
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| 7 | |
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| 8 | /* |
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[88d594a] | 9 | * File: newlibc.c,v |
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[ac7d5ef0] | 10 | * Project: PixelFlow |
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| 11 | * Created: 94/12/7 |
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[88d594a] | 12 | * Revision: 1.2 |
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| 13 | * Last Mod: 1995/05/09 20:24:37 |
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[ac7d5ef0] | 14 | * |
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| 15 | * COPYRIGHT (c) 1994 by Division Incorporated |
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| 16 | * |
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| 17 | * To anyone who acknowledges that this file is provided "AS IS" |
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| 18 | * without any express or implied warranty: |
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| 19 | * permission to use, copy, modify, and distribute this file |
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| 20 | * for any purpose is hereby granted without fee, provided that |
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| 21 | * the above copyright notice and this notice appears in all |
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| 22 | * copies, and that the name of Division Incorporated not be |
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| 23 | * used in advertising or publicity pertaining to distribution |
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| 24 | * of the software without specific, written prior permission. |
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| 25 | * Division Incorporated makes no representations about the |
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| 26 | * suitability of this software for any purpose. |
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| 27 | * |
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| 28 | * Description: |
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| 29 | * Implementation of hooks for the CYGNUS newlib libc |
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| 30 | * These hooks set things up so that: |
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| 31 | * '_REENT' is switched at task switch time. |
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| 32 | * |
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| 33 | * |
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| 34 | * TODO: |
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| 35 | * |
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| 36 | * NOTE: |
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| 37 | * |
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[3235ad9] | 38 | * $Id$ |
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[ac7d5ef0] | 39 | * |
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| 40 | */ |
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| 41 | |
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| 42 | #include <rtems.h> |
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| 43 | #include <libcsupport.h> |
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| 44 | #include <stdlib.h> /* for free() */ |
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| 45 | #include <string.h> /* for memset() */ |
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| 46 | |
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| 47 | #include <sys/reent.h> /* for extern of _REENT (aka _impure_ptr) */ |
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| 48 | |
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| 49 | #include "internal.h" |
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| 50 | |
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| 51 | #define LIBC_NOTEPAD RTEMS_NOTEPAD_LAST |
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| 52 | |
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| 53 | |
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| 54 | int libc_reentrant; /* do we think we are reentrant? */ |
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| 55 | struct _reent libc_global_reent = _REENT_INIT(libc_global_reent);; |
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| 56 | |
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| 57 | /* |
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| 58 | * CYGNUS newlib routine that does atexit() processing and flushes |
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| 59 | * stdio streams |
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| 60 | * undocumented |
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| 61 | */ |
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| 62 | |
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| 63 | extern void _wrapup_reent(struct _reent *); |
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| 64 | extern void _reclaim_reent(struct _reent *); |
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| 65 | |
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| 66 | void |
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| 67 | libc_wrapup(void) |
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| 68 | { |
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| 69 | _wrapup_reent(0); |
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| 70 | if (_REENT != &libc_global_reent) |
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| 71 | { |
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| 72 | _wrapup_reent(&libc_global_reent); |
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| 73 | #if 0 |
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| 74 | /* don't reclaim this one, just in case we do printfs */ |
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| 75 | /* on our way out to ROM */ |
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| 76 | _reclaim_reent(&libc_global_reent); |
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| 77 | #endif |
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| 78 | _REENT = &libc_global_reent; |
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| 79 | } |
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| 80 | } |
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| 81 | |
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| 82 | |
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[3a4ae6c] | 83 | rtems_boolean |
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[ac7d5ef0] | 84 | libc_create_hook(rtems_tcb *current_task, |
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| 85 | rtems_tcb *creating_task) |
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| 86 | { |
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| 87 | MY_task_set_note(creating_task, LIBC_NOTEPAD, 0); |
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[3a4ae6c] | 88 | return TRUE; |
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[ac7d5ef0] | 89 | } |
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| 90 | |
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| 91 | /* |
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| 92 | * Called for all user TASKS (system tasks are SYSI and IDLE) |
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| 93 | */ |
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| 94 | |
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| 95 | rtems_extension |
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| 96 | libc_start_hook(rtems_tcb *current_task, |
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| 97 | rtems_tcb *starting_task) |
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| 98 | { |
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| 99 | struct _reent *ptr; |
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| 100 | |
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| 101 | /* NOTE: our malloc is reentrant without a reent ptr since |
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| 102 | * it is based on region manager |
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| 103 | */ |
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| 104 | |
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| 105 | ptr = (struct _reent *) malloc(sizeof(struct _reent)); |
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| 106 | |
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| 107 | /* GCC extension: structure constants */ |
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| 108 | *ptr = (struct _reent) _REENT_INIT((*ptr)); |
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| 109 | |
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| 110 | MY_task_set_note(starting_task, LIBC_NOTEPAD, (rtems_unsigned32) ptr); |
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| 111 | } |
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| 112 | |
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| 113 | rtems_extension |
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| 114 | libc_switch_hook(rtems_tcb *current_task, |
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| 115 | rtems_tcb *heir_task) |
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| 116 | { |
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| 117 | rtems_unsigned32 impure_value; |
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| 118 | |
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| 119 | /* XXX We can't use rtems_task_set_note() here since SYSI task has a |
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| 120 | * tid of 0, which is treated specially (optimized, actually) |
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| 121 | * by rtems_task_set_note |
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[b3ac6a8d] | 122 | * |
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| 123 | * NOTE: The above comment is no longer true and we need to use |
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| 124 | * the extension data areas added about the same time. |
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[ac7d5ef0] | 125 | */ |
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| 126 | |
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[b3ac6a8d] | 127 | /* |
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| 128 | * Don't touch the outgoing task if it has been deleted. |
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| 129 | */ |
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| 130 | |
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| 131 | if ( !_States_Is_transient( current_task->current_state ) ) { |
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| 132 | impure_value = (rtems_unsigned32) _REENT; |
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| 133 | MY_task_set_note(current_task, LIBC_NOTEPAD, impure_value); |
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| 134 | } |
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[ac7d5ef0] | 135 | |
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| 136 | _REENT = (struct _reent *) MY_task_get_note(heir_task, LIBC_NOTEPAD); |
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| 137 | |
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| 138 | } |
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| 139 | |
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| 140 | /* |
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| 141 | * Function: libc_delete_hook |
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| 142 | * Created: 94/12/10 |
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| 143 | * |
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| 144 | * Description: |
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| 145 | * Called when a task is deleted. |
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| 146 | * Must restore the new lib reentrancy state for the new current |
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| 147 | * task. |
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| 148 | * |
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| 149 | * Parameters: |
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| 150 | * |
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| 151 | * |
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| 152 | * Returns: |
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| 153 | * |
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| 154 | * |
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| 155 | * Side Effects: |
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| 156 | * |
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| 157 | * Notes: |
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| 158 | * |
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| 159 | * |
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| 160 | * Deficiencies/ToDo: |
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| 161 | * |
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| 162 | * |
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| 163 | */ |
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| 164 | rtems_extension |
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| 165 | libc_delete_hook(rtems_tcb *current_task, |
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| 166 | rtems_tcb *deleted_task) |
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| 167 | { |
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| 168 | struct _reent *ptr; |
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| 169 | |
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| 170 | /* |
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| 171 | * The reentrancy structure was allocated by newlib using malloc() |
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| 172 | */ |
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| 173 | |
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| 174 | if (current_task == deleted_task) |
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| 175 | { |
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| 176 | ptr = _REENT; |
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| 177 | } |
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| 178 | else |
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| 179 | { |
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| 180 | ptr = (struct _reent *) MY_task_get_note(deleted_task, LIBC_NOTEPAD); |
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| 181 | } |
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| 182 | |
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[b3ac6a8d] | 183 | /* if (ptr) */ |
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| 184 | if (ptr && ptr != &libc_global_reent) |
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[ac7d5ef0] | 185 | { |
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| 186 | _wrapup_reent(ptr); |
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| 187 | _reclaim_reent(ptr); |
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| 188 | } |
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| 189 | |
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| 190 | MY_task_set_note(deleted_task, LIBC_NOTEPAD, 0); |
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| 191 | |
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| 192 | /* |
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| 193 | * Require the switch back to another task to install its own |
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| 194 | */ |
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| 195 | |
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| 196 | if (current_task == deleted_task) |
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| 197 | { |
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| 198 | _REENT = 0; |
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| 199 | } |
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| 200 | } |
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| 201 | |
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| 202 | /* |
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| 203 | * Function: libc_init |
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| 204 | * Created: 94/12/10 |
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| 205 | * |
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| 206 | * Description: |
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| 207 | * Init libc for CYGNUS newlib |
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| 208 | * Set up _REENT to use our global libc_global_reent. |
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| 209 | * (newlib provides a global of its own, but we prefer our |
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| 210 | * own name for it) |
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| 211 | * |
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| 212 | * If reentrancy is desired (which it should be), then |
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| 213 | * we install the task extension hooks to maintain the |
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| 214 | * newlib reentrancy global variable _REENT on task |
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| 215 | * create, delete, switch, exit, etc. |
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| 216 | * |
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| 217 | * Parameters: |
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| 218 | * reentrant non-zero if reentrant library desired. |
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| 219 | * |
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| 220 | * Returns: |
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| 221 | * |
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| 222 | * Side Effects: |
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| 223 | * installs libc extensions if reentrant. |
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| 224 | * |
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| 225 | * Notes: |
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| 226 | * |
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| 227 | * |
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| 228 | * Deficiencies/ToDo: |
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| 229 | * |
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| 230 | */ |
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| 231 | |
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| 232 | void |
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| 233 | libc_init(int reentrant) |
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| 234 | { |
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| 235 | rtems_extensions_table libc_extension; |
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| 236 | rtems_id extension_id; |
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| 237 | rtems_status_code rc; |
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| 238 | |
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| 239 | _REENT = &libc_global_reent; |
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| 240 | |
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| 241 | if (reentrant) |
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| 242 | { |
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| 243 | memset(&libc_extension, 0, sizeof(libc_extension)); |
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| 244 | |
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[3a4ae6c] | 245 | libc_extension.thread_create = libc_create_hook; |
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| 246 | libc_extension.thread_start = libc_start_hook; |
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| 247 | libc_extension.thread_switch = libc_switch_hook; |
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| 248 | libc_extension.thread_delete = libc_delete_hook; |
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[ac7d5ef0] | 249 | |
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| 250 | rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'), |
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| 251 | &libc_extension, &extension_id); |
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| 252 | if (rc != RTEMS_SUCCESSFUL) |
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| 253 | rtems_fatal_error_occurred(rc); |
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| 254 | |
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| 255 | libc_reentrant = reentrant; |
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| 256 | } |
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| 257 | } |
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| 258 | |
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| 259 | |
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| 260 | void |
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| 261 | exit(int status) |
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| 262 | { |
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| 263 | libc_wrapup(); |
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| 264 | rtems_shutdown_executive(status); |
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| 265 | } |
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| 266 | |
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| 267 | |
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| 268 | /* |
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| 269 | * Function: _exit |
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| 270 | * Created: 94/12/10 |
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| 271 | * |
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| 272 | * Description: |
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| 273 | * Called from exit() after it does atexit() processing and stdio fflush's |
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| 274 | * |
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| 275 | * called from bottom of exit() to really delete the task. |
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| 276 | * If we are using reentrant libc, then let the delete extension |
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| 277 | * do all the work, otherwise if a shutdown is in progress, |
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| 278 | * then just do it. |
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| 279 | * |
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| 280 | * Parameters: |
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| 281 | * exit status |
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| 282 | * |
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| 283 | * Returns: |
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| 284 | * does not return |
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| 285 | * |
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| 286 | * Side Effects: |
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| 287 | * |
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| 288 | * Notes: |
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| 289 | * |
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| 290 | * |
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| 291 | * Deficiencies/ToDo: |
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| 292 | * |
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| 293 | * |
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| 294 | */ |
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| 295 | |
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[637df35] | 296 | #if !defined(RTEMS_UNIX) && !defined(__GO32__) |
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[ac7d5ef0] | 297 | void _exit(int status) |
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| 298 | { |
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| 299 | rtems_shutdown_executive(status); |
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| 300 | } |
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| 301 | #endif |
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| 302 | |
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| 303 | #endif |
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