[ac7d5ef0] | 1 | #if defined(RTEMS_NEWLIB) |
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| 2 | |
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| 3 | /* |
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| 4 | * COPYRIGHT (c) 1994 by Division Incorporated |
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| 5 | * |
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| 6 | * To anyone who acknowledges that this file is provided "AS IS" |
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| 7 | * without any express or implied warranty: |
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| 8 | * permission to use, copy, modify, and distribute this file |
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| 9 | * for any purpose is hereby granted without fee, provided that |
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| 10 | * the above copyright notice and this notice appears in all |
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| 11 | * copies, and that the name of Division Incorporated not be |
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| 12 | * used in advertising or publicity pertaining to distribution |
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| 13 | * of the software without specific, written prior permission. |
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| 14 | * Division Incorporated makes no representations about the |
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| 15 | * suitability of this software for any purpose. |
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| 16 | * |
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| 17 | * Description: |
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| 18 | * Implementation of hooks for the CYGNUS newlib libc |
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| 19 | * These hooks set things up so that: |
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| 20 | * '_REENT' is switched at task switch time. |
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| 21 | * |
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| 22 | * |
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| 23 | * TODO: |
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| 24 | * |
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| 25 | * NOTE: |
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| 26 | * |
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[3235ad9] | 27 | * $Id$ |
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[ac7d5ef0] | 28 | * |
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| 29 | */ |
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| 30 | |
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[1a8fde6c] | 31 | #define __RTEMS_VIOLATE_KERNEL_VISIBILITY__ |
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[ac7d5ef0] | 32 | #include <rtems.h> |
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| 33 | #include <libcsupport.h> |
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| 34 | #include <stdlib.h> /* for free() */ |
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| 35 | #include <string.h> /* for memset() */ |
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| 36 | |
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| 37 | #include <sys/reent.h> /* for extern of _REENT (aka _impure_ptr) */ |
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| 38 | |
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[1f94ed6b] | 39 | /* |
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| 40 | * NOTE: When using RTEMS fake stat, fstat, and isatty, all output |
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| 41 | * is line buffered so this setvbuf is not necessary. This |
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| 42 | * setvbuf insures that we can redirect the output of a test |
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| 43 | * on the UNIX simulator and it is in the same order as for a |
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| 44 | * real target. |
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| 45 | * NOTE: |
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| 46 | * There is some problem with doing this on the hpux version |
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| 47 | * of the UNIX simulator (symptom is printf core dumps), so |
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| 48 | * we just don't for now. |
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| 49 | * Not sure if this is a problem with hpux, newlib, or something else. |
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| 50 | */ |
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| 51 | |
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| 52 | #if defined(RTEMS_UNIX) && !defined(hpux) |
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| 53 | #define NEED_SETVBUF |
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| 54 | #endif |
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| 55 | |
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| 56 | #ifdef NEED_SETVBUF |
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| 57 | #include <stdio.h> |
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[eaa442fc] | 58 | #endif |
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| 59 | |
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[ac7d5ef0] | 60 | #include "internal.h" |
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| 61 | |
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| 62 | #define LIBC_NOTEPAD RTEMS_NOTEPAD_LAST |
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| 63 | |
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| 64 | |
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| 65 | int libc_reentrant; /* do we think we are reentrant? */ |
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| 66 | struct _reent libc_global_reent = _REENT_INIT(libc_global_reent);; |
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| 67 | |
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| 68 | /* |
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| 69 | * CYGNUS newlib routine that does atexit() processing and flushes |
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| 70 | * stdio streams |
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| 71 | * undocumented |
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| 72 | */ |
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| 73 | |
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| 74 | extern void _wrapup_reent(struct _reent *); |
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| 75 | extern void _reclaim_reent(struct _reent *); |
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| 76 | |
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| 77 | void |
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| 78 | libc_wrapup(void) |
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| 79 | { |
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| 80 | _wrapup_reent(0); |
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| 81 | if (_REENT != &libc_global_reent) |
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| 82 | { |
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| 83 | _wrapup_reent(&libc_global_reent); |
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| 84 | #if 0 |
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| 85 | /* don't reclaim this one, just in case we do printfs */ |
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| 86 | /* on our way out to ROM */ |
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| 87 | _reclaim_reent(&libc_global_reent); |
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| 88 | #endif |
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| 89 | _REENT = &libc_global_reent; |
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| 90 | } |
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| 91 | } |
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| 92 | |
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| 93 | |
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[3a4ae6c] | 94 | rtems_boolean |
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[ac7d5ef0] | 95 | libc_create_hook(rtems_tcb *current_task, |
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| 96 | rtems_tcb *creating_task) |
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| 97 | { |
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| 98 | MY_task_set_note(creating_task, LIBC_NOTEPAD, 0); |
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[3a4ae6c] | 99 | return TRUE; |
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[ac7d5ef0] | 100 | } |
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| 101 | |
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| 102 | /* |
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[8cbbe312] | 103 | * Called for all user TASKS (system tasks are MPCI Receive Server and IDLE) |
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[ac7d5ef0] | 104 | */ |
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| 105 | |
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| 106 | rtems_extension |
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| 107 | libc_start_hook(rtems_tcb *current_task, |
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| 108 | rtems_tcb *starting_task) |
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| 109 | { |
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| 110 | struct _reent *ptr; |
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| 111 | |
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| 112 | /* NOTE: our malloc is reentrant without a reent ptr since |
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| 113 | * it is based on region manager |
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| 114 | */ |
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| 115 | |
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| 116 | ptr = (struct _reent *) malloc(sizeof(struct _reent)); |
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| 117 | |
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| 118 | /* GCC extension: structure constants */ |
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| 119 | *ptr = (struct _reent) _REENT_INIT((*ptr)); |
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| 120 | |
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| 121 | MY_task_set_note(starting_task, LIBC_NOTEPAD, (rtems_unsigned32) ptr); |
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| 122 | } |
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| 123 | |
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[eaa442fc] | 124 | /* |
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[8cbbe312] | 125 | * Called for all user TASKS (system tasks are MPCI Receive Server and IDLE) |
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[eaa442fc] | 126 | * |
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| 127 | * NOTE: When using RTEMS fake stat, fstat, and isatty, all output |
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| 128 | * is line buffered so this setvbuf is not necessary. This |
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| 129 | * setvbuf insures that we can redirect the output of a test |
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| 130 | * on the UNIX simulator and it is in the same order as for a |
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| 131 | * real target. |
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| 132 | */ |
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| 133 | |
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| 134 | #ifdef RTEMS_UNIX |
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| 135 | rtems_extension |
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| 136 | libc_begin_hook(rtems_tcb *current_task) |
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| 137 | { |
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| 138 | setvbuf( stdout, NULL, _IOLBF, BUFSIZ ); |
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| 139 | } |
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| 140 | #endif |
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| 141 | |
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[ac7d5ef0] | 142 | rtems_extension |
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| 143 | libc_switch_hook(rtems_tcb *current_task, |
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| 144 | rtems_tcb *heir_task) |
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| 145 | { |
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| 146 | rtems_unsigned32 impure_value; |
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| 147 | |
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| 148 | /* XXX We can't use rtems_task_set_note() here since SYSI task has a |
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| 149 | * tid of 0, which is treated specially (optimized, actually) |
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| 150 | * by rtems_task_set_note |
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[b3ac6a8d] | 151 | * |
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| 152 | * NOTE: The above comment is no longer true and we need to use |
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| 153 | * the extension data areas added about the same time. |
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[ac7d5ef0] | 154 | */ |
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| 155 | |
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[b3ac6a8d] | 156 | /* |
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| 157 | * Don't touch the outgoing task if it has been deleted. |
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| 158 | */ |
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| 159 | |
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| 160 | if ( !_States_Is_transient( current_task->current_state ) ) { |
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| 161 | impure_value = (rtems_unsigned32) _REENT; |
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| 162 | MY_task_set_note(current_task, LIBC_NOTEPAD, impure_value); |
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| 163 | } |
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[ac7d5ef0] | 164 | |
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| 165 | _REENT = (struct _reent *) MY_task_get_note(heir_task, LIBC_NOTEPAD); |
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| 166 | |
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| 167 | } |
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| 168 | |
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| 169 | /* |
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| 170 | * Function: libc_delete_hook |
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| 171 | * Created: 94/12/10 |
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| 172 | * |
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| 173 | * Description: |
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| 174 | * Called when a task is deleted. |
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| 175 | * Must restore the new lib reentrancy state for the new current |
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| 176 | * task. |
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| 177 | * |
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| 178 | * Parameters: |
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| 179 | * |
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| 180 | * |
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| 181 | * Returns: |
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| 182 | * |
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| 183 | * |
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| 184 | * Side Effects: |
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| 185 | * |
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| 186 | * Notes: |
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| 187 | * |
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| 188 | * |
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| 189 | * Deficiencies/ToDo: |
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| 190 | * |
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| 191 | * |
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| 192 | */ |
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| 193 | rtems_extension |
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| 194 | libc_delete_hook(rtems_tcb *current_task, |
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| 195 | rtems_tcb *deleted_task) |
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| 196 | { |
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| 197 | struct _reent *ptr; |
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| 198 | |
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| 199 | /* |
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| 200 | * The reentrancy structure was allocated by newlib using malloc() |
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| 201 | */ |
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| 202 | |
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| 203 | if (current_task == deleted_task) |
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| 204 | { |
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[1f94ed6b] | 205 | ptr = _REENT; |
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[ac7d5ef0] | 206 | } |
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| 207 | else |
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| 208 | { |
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[1f94ed6b] | 209 | ptr = (struct _reent *) MY_task_get_note(deleted_task, LIBC_NOTEPAD); |
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[ac7d5ef0] | 210 | } |
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| 211 | |
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[b3ac6a8d] | 212 | /* if (ptr) */ |
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| 213 | if (ptr && ptr != &libc_global_reent) |
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[ac7d5ef0] | 214 | { |
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[1f94ed6b] | 215 | _wrapup_reent(ptr); |
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| 216 | _reclaim_reent(ptr); |
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| 217 | free(ptr); |
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[ac7d5ef0] | 218 | } |
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| 219 | |
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| 220 | MY_task_set_note(deleted_task, LIBC_NOTEPAD, 0); |
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| 221 | |
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| 222 | /* |
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| 223 | * Require the switch back to another task to install its own |
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| 224 | */ |
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| 225 | |
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| 226 | if (current_task == deleted_task) |
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| 227 | { |
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[1f94ed6b] | 228 | _REENT = 0; |
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[ac7d5ef0] | 229 | } |
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| 230 | } |
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| 231 | |
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| 232 | /* |
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| 233 | * Function: libc_init |
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| 234 | * Created: 94/12/10 |
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| 235 | * |
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| 236 | * Description: |
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| 237 | * Init libc for CYGNUS newlib |
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| 238 | * Set up _REENT to use our global libc_global_reent. |
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| 239 | * (newlib provides a global of its own, but we prefer our |
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| 240 | * own name for it) |
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| 241 | * |
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| 242 | * If reentrancy is desired (which it should be), then |
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| 243 | * we install the task extension hooks to maintain the |
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| 244 | * newlib reentrancy global variable _REENT on task |
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| 245 | * create, delete, switch, exit, etc. |
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| 246 | * |
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| 247 | * Parameters: |
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| 248 | * reentrant non-zero if reentrant library desired. |
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| 249 | * |
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| 250 | * Returns: |
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| 251 | * |
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| 252 | * Side Effects: |
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| 253 | * installs libc extensions if reentrant. |
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| 254 | * |
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| 255 | * Notes: |
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| 256 | * |
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| 257 | * |
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| 258 | * Deficiencies/ToDo: |
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| 259 | * |
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| 260 | */ |
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| 261 | |
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| 262 | void |
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| 263 | libc_init(int reentrant) |
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| 264 | { |
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| 265 | rtems_extensions_table libc_extension; |
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| 266 | rtems_id extension_id; |
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| 267 | rtems_status_code rc; |
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| 268 | |
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| 269 | _REENT = &libc_global_reent; |
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| 270 | |
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| 271 | if (reentrant) |
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| 272 | { |
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| 273 | memset(&libc_extension, 0, sizeof(libc_extension)); |
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| 274 | |
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[3a4ae6c] | 275 | libc_extension.thread_create = libc_create_hook; |
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| 276 | libc_extension.thread_start = libc_start_hook; |
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[eaa442fc] | 277 | #ifdef RTEMS_UNIX |
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| 278 | libc_extension.thread_begin = libc_begin_hook; |
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| 279 | #endif |
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[3a4ae6c] | 280 | libc_extension.thread_switch = libc_switch_hook; |
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| 281 | libc_extension.thread_delete = libc_delete_hook; |
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[ac7d5ef0] | 282 | |
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| 283 | rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'), |
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| 284 | &libc_extension, &extension_id); |
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| 285 | if (rc != RTEMS_SUCCESSFUL) |
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| 286 | rtems_fatal_error_occurred(rc); |
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| 287 | |
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| 288 | libc_reentrant = reentrant; |
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| 289 | } |
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| 290 | } |
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| 291 | |
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| 292 | |
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| 293 | void |
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| 294 | exit(int status) |
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| 295 | { |
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| 296 | libc_wrapup(); |
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| 297 | rtems_shutdown_executive(status); |
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| 298 | } |
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| 299 | |
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| 300 | |
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| 301 | /* |
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| 302 | * Function: _exit |
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| 303 | * Created: 94/12/10 |
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| 304 | * |
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| 305 | * Description: |
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| 306 | * Called from exit() after it does atexit() processing and stdio fflush's |
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| 307 | * |
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| 308 | * called from bottom of exit() to really delete the task. |
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| 309 | * If we are using reentrant libc, then let the delete extension |
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| 310 | * do all the work, otherwise if a shutdown is in progress, |
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| 311 | * then just do it. |
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| 312 | * |
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| 313 | * Parameters: |
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| 314 | * exit status |
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| 315 | * |
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| 316 | * Returns: |
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| 317 | * does not return |
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| 318 | * |
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| 319 | * Side Effects: |
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| 320 | * |
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| 321 | * Notes: |
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| 322 | * |
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| 323 | * |
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| 324 | * Deficiencies/ToDo: |
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| 325 | * |
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| 326 | * |
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| 327 | */ |
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| 328 | |
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[637df35] | 329 | #if !defined(RTEMS_UNIX) && !defined(__GO32__) |
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[ac7d5ef0] | 330 | void _exit(int status) |
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| 331 | { |
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| 332 | rtems_shutdown_executive(status); |
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| 333 | } |
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| 334 | #endif |
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| 335 | |
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| 336 | #endif |
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