File: __brk.c

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#include <unistd.h>
#include <sys/syscall.h>
#include <errno.h>

extern void * ___brk_addr;

extern int __init_brk ();

int __brk(void * end_data_seg)
{
    if (__init_brk () == 0)
    {
	__asm__ volatile ("mov %1, %%g1\n\t"
			  "mov %2, %%o0\n\t"
			  "t 0x10\n\t"
			  "mov %%o0, %0\n\t"
		:"=r" (___brk_addr)
		:"0" (SYS_brk),"r" (end_data_seg)
	        :"g1", "o0");
	if (___brk_addr == end_data_seg)
		return 0;
	errno = ENOMEM;
    }
    return -1;
}

#include <gnu-stabs.h>
#ifdef weak_alias
weak_alias (__brk, brk);
#endif