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/*
* Copyright (C) 1998, 1999, 2002, 2003, 2005 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*
* Register stack engine related helper functions. This file may be
* used in applications, so be careful about the name-space and give
* some consideration to non-GNU C compilers (though __inline__ is
* fine).
*/
#ifndef RSE_H
#define RSE_H
#include <libunwind.h>
static inline uint64_t
rse_slot_num (uint64_t addr)
{
return (addr >> 3) & 0x3f;
}
/*
* Return TRUE if ADDR is the address of an RNAT slot.
*/
static inline uint64_t
rse_is_rnat_slot (uint64_t addr)
{
return rse_slot_num (addr) == 0x3f;
}
/*
* Returns the address of the RNAT slot that covers the slot at
* address SLOT_ADDR.
*/
static inline uint64_t
rse_rnat_addr (uint64_t slot_addr)
{
return slot_addr | (0x3f << 3);
}
/*
* Calculate the number of registers in the dirty partition starting at
* BSPSTORE and ending at BSP. This isn't simply (BSP-BSPSTORE)/8
* because every 64th slot stores ar.rnat.
*/
static inline uint64_t
rse_num_regs (uint64_t bspstore, uint64_t bsp)
{
uint64_t slots = (bsp - bspstore) >> 3;
return slots - (rse_slot_num(bspstore) + slots)/0x40;
}
/*
* The inverse of the above: given bspstore and the number of
* registers, calculate ar.bsp.
*/
static inline uint64_t
rse_skip_regs (uint64_t addr, long num_regs)
{
long delta = rse_slot_num(addr) + num_regs;
if (num_regs < 0)
delta -= 0x3e;
return addr + ((num_regs + delta/0x3f) << 3);
}
#endif /* RSE_H */
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