| /* |
| * 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 */ |
