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/* Copyright (C) 2016 Jeremiah Orians
* This file is part of M2-Planet.
*
* M2-Planet is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* M2-Planet is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
*/
// CONSTANT stdin 0
// CONSTANT stdout 1
// CONSTANT stderr 2
// CONSTANT EOF 0xFFFFFFFF
// CONSTANT NULL 0
// CONSTANT EXIT_FAILURE 1
// CONSTANT EXIT_SUCCESS 0
// CONSTANT TRUE 1
// CONSTANT FALSE 0
int fgetc(FILE* f)
{
asm("lea_rdi,[rsp+DWORD] %8"
"mov_rdi,[rdi]"
"mov_rax, %0"
"push_rax"
"lea_rsi,[rsp+DWORD] %0"
"mov_rdx, %1"
"syscall"
"mov_rbx, %0"
"cmp_rbx,rax"
"pop_rax"
"jne %FUNCTION_fgetc_Done"
"mov_rax, %-1"
":FUNCTION_fgetc_Done");
}
void fputc(char s, FILE* f)
{
asm("mov_rax, %1"
"lea_rdi,[rsp+DWORD] %8"
"mov_rdi,[rdi]"
"lea_rsi,[rsp+DWORD] %16"
"mov_rdx, %1"
"syscall");
}
void fputs(char* s, FILE* f)
{
while(0 != s[0])
{
fputc(s[0], f);
s = s + 1;
}
}
FILE* open(char* name, int flag, int mode)
{
asm("lea_rdi,[rsp+DWORD] %24"
"mov_rdi,[rdi]"
"lea_rsi,[rsp+DWORD] %16"
"mov_rsi,[rsi]"
"lea_rdx,[rsp+DWORD] %8"
"mov_rdx,[rdx]"
"mov_rax, %2"
"syscall");
}
FILE* fopen(char* filename, char* mode)
{
FILE* f;
if('w' == mode[0])
{ /* 577 is O_WRONLY|O_CREAT|O_TRUNC, 384 is 600 in octal */
f = open(filename, 577 , 384);
}
else
{ /* Everything else is a read */
f = open(filename, 0, 0);
}
/* Negative numbers are error codes */
if(0 > f)
{
return 0;
}
return f;
}
int close(int fd)
{
asm("lea_rdi,[rsp+DWORD] %8"
"mov_rdi,[rdi]"
"mov_rax, %3"
"syscall");
}
int fclose(FILE* stream)
{
int error = close(stream);
return error;
}
int brk(void *addr)
{
asm("mov_rax,[rsp+DWORD] %8"
"push_rax"
"mov_rax, %12"
"pop_rbx"
"mov_rdi,rbx"
"syscall");
}
long _malloc_ptr;
long _brk_ptr;
void* malloc(int size)
{
if(NULL == _brk_ptr)
{
_brk_ptr = brk(0);
_malloc_ptr = _brk_ptr;
}
if(_brk_ptr < _malloc_ptr + size)
{
_brk_ptr = brk(_malloc_ptr + size);
if(-1 == _brk_ptr) return 0;
}
long old_malloc = _malloc_ptr;
_malloc_ptr = _malloc_ptr + size;
return old_malloc;
}
int strlen(char* str )
{
int i = 0;
while(0 != str[i]) i = i + 1;
return i;
}
void* memset(void* ptr, int value, int num)
{
char* s;
for(s = ptr; 0 < num; num = num - 1)
{
s[0] = value;
s = s + 1;
}
}
void* calloc(int count, int size)
{
void* ret = malloc(count * size);
if(NULL == ret) return NULL;
memset(ret, 0, (count * size));
return ret;
}
void free(void* l)
{
return;
}
void exit(int value)
{
asm("pop_rbx"
"pop_rdi"
"mov_rax, %0x3C"
"syscall");
}
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