49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of M2-Planet.
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*
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* M2-Planet is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* M2-Planet is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
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*/
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// CONSTANT NULL 0
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int brk(void *addr)
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{
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asm("!4 R0 SUB R12 ARITH_ALWAYS"
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"!0 R0 LOAD32 R0 MEMORY"
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"!45 R7 LOADI8_ALWAYS"
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"SYSCALL_ALWAYS");
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}
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long _malloc_ptr;
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long _brk_ptr;
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void* malloc(int size)
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{
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if(NULL == _brk_ptr)
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{
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_brk_ptr = brk(0);
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_malloc_ptr = _brk_ptr;
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}
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if(_brk_ptr < _malloc_ptr + size)
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{
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_brk_ptr = brk(_malloc_ptr + size);
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if(-1 == _brk_ptr) return 0;
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}
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long old_malloc = _malloc_ptr;
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_malloc_ptr = _malloc_ptr + size;
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return old_malloc;
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}
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