Last change
on this file since 688 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.5 KB
|
Rev | Line | |
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[444] | 1 | /* |
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| 2 | * Copyright (c) 2003 Red Hat, Inc. All rights reserved. |
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| 3 | * |
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| 4 | * This copyrighted material is made available to anyone wishing to use, modify, |
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| 5 | * copy, or redistribute it subject to the terms and conditions of the BSD |
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| 6 | * License. This program is distributed in the hope that it will be useful, |
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| 7 | * but WITHOUT ANY WARRANTY expressed or implied, including the implied |
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| 8 | * warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy |
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| 9 | * of this license is available at http://www.opensource.org/licenses. Any |
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| 10 | * Red Hat trademarks that are incorporated in the source code or documentation |
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| 11 | * are not subject to the BSD License and may only be used or replicated with |
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| 12 | * the express permission of Red Hat, Inc. |
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| 13 | */ |
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| 14 | |
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| 15 | #include <errno.h> |
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| 16 | |
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| 17 | extern int __heap __far; /* beginning of heap */ |
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| 18 | extern int __heap_end __far; /* if at address 0, use stack pointer as limit */ |
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| 19 | |
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| 20 | static char *the_break = (char *)(& __heap); |
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| 21 | |
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| 22 | int |
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| 23 | is_addr_0 (int address) |
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| 24 | { |
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| 25 | return address ? 0 : 1; |
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| 26 | } |
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| 27 | |
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| 28 | void * |
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| 29 | sbrk(int inc) |
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| 30 | { |
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| 31 | char *current_heap_limit = (char *) (& __heap_end); |
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| 32 | |
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| 33 | /* is_addr_0 avoids optimizing out this block. */ |
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| 34 | if (is_addr_0 ((int) current_heap_limit)) |
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| 35 | { |
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| 36 | int something; |
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| 37 | int margin = 4096; |
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| 38 | current_heap_limit = (char *) (& something) - margin; |
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| 39 | } |
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| 40 | |
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| 41 | if ((the_break + inc) < current_heap_limit) |
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| 42 | { |
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| 43 | void *rv = (void *) the_break; |
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| 44 | the_break += inc; |
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| 45 | return rv; |
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| 46 | } |
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| 47 | else |
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| 48 | { |
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| 49 | errno = ENOMEM; |
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| 50 | return (void *) -1; |
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| 51 | } |
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| 52 | } |
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| 53 | |
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| 54 | int |
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| 55 | brk (void *ptr) |
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| 56 | { |
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| 57 | the_break = ptr; |
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| 58 | return 0; |
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| 59 | } |
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