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/*
* File: ldalloc.c
* Date: 28 March 1998
* Acct: David Powell (dep)
* Desc: simple allocation routines
*/
#include "ldalloc.h"
#include "ldutil.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
static unsigned long start;
static unsigned long pos;
static unsigned long amount;
/* This function initializes the simple memory allocator. We basically
* allocate a specified number of pages to use as scratch memory for
* the linker itself. No deallocation functionality is provided; the
* amount of memory used should be small, and is usually needed for the
* duration of the program's execution, anyway.
*
* All this function does is mmap the specified number of pages of
* /dev/zero to provide the memory for our little memory-wading-pool. */
void _ldainit(unsigned long pagesize, unsigned long pages)
{
amount = pagesize * pages;
pos = 0;
start = (unsigned long)mmap(NULL, amount, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (start == (unsigned long)MAP_FAILED)
{
fprintf(stderr, "ld-weenix: panic - unable to map /dev/zero\n");
exit(1);
}
}
/* This function allocates a block of memory of the specified size from
* our memory pool. The memory is word-aligned, and cannot be freed. */
void *_ldalloc(unsigned long size)
{
unsigned long next;
if (size & 3)
{
size = (size & ~3) + 4;
}
if (pos + size > amount)
{
fprintf(stderr,
"ld.so.1: panic - unable to allocate %lu bytes (_ldalloc)\n",
size);
exit(1);
}
next = start + pos;
pos += size;
return (void *)next;
}
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