2 (C) Copyright IBM Corp. 2005, 2006
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19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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30 Author: Andreas Neukoetter (ti95neuk@de.ibm.com)
33 #include <sys/types.h>
35 #include <spu_intrinsics.h>
38 #define STACKSIZE 4096
41 sbrk (ptrdiff_t increment)
43 static caddr_t heap_ptr = NULL;
45 vector unsigned int sp_reg, sp_delta;
46 vector unsigned int *sp_ptr;
49 /* The stack pointer register. */
50 volatile register vector unsigned int sp_r1 __asm__("1");
53 heap_ptr = (caddr_t) & _end;
55 sps = (caddr_t) spu_extract (sp_r1, 0);
56 if (((int) sps - STACKSIZE - (int) heap_ptr) >= increment)
59 heap_ptr += increment;
61 sp_delta = (vector unsigned int) spu_insert (increment, spu_splats (0), 1);
63 /* Subtract sp_delta from the SP limit (word 1). */
64 sp_r1 = spu_sub (sp_r1, sp_delta);
66 /* Fix-up backchain. */
67 sp_ptr = (vector unsigned int *) spu_extract (sp_r1, 0);
71 *sp_ptr = (vector unsigned int) spu_sub (sp_reg, sp_delta);
73 while ((sp_ptr = (vector unsigned int *) spu_extract (sp_reg, 0)));