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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [mips/] [syscalls.c] - Rev 310
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#include <_ansi.h> #include <sys/types.h> #include <sys/stat.h> #include "regs.S" extern char _end[]; /* FIXME: This is not ideal, since we do a get_mem_info() call for every sbrk() call. */ char * sbrk (nbytes) int nbytes; { static char *heap_ptr = _end; static char *heap_start = _end; char *base; struct s_mem { unsigned int size; unsigned int icsize; unsigned int dcsize; } mem; unsigned int avail = 0; /* The sizeof (s_mem.size) must be 4 bytes. The compiler should be able to eliminate this check */ if (sizeof (unsigned int) != 4) return (char *)-1; get_mem_info(&mem); /* NOTE: The value returned from the get_mem_info call is the amount of memory, and not the address of the (last byte + 1) */ if (((size_t)heap_ptr >= heap_start) && ((size_t)heap_ptr < (heap_start + mem.size))) { avail = (heap_start + mem.size) - (size_t)heap_ptr; base = heap_ptr; } /* else will fail since "nbytes" will be greater than zeroed "avail" value */ if ((nbytes > avail) || (heap_ptr + nbytes < _end)) base = (char *)-1; else heap_ptr += nbytes; return base; }
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