1 /* 2 * Copyright (C) 1998, 1999, 2002, 2003, 2005 Hewlett-Packard Co 3 * David Mosberger-Tang <davidm (at) hpl.hp.com> 4 * 5 * Register stack engine related helper functions. This file may be 6 * used in applications, so be careful about the name-space and give 7 * some consideration to non-GNU C compilers (though __inline__ is 8 * fine). 9 */ 10 #ifndef RSE_H 11 #define RSE_H 12 13 #include <libunwind.h> 14 15 static inline uint64_t 16 rse_slot_num (uint64_t addr) 17 { 18 return (addr >> 3) & 0x3f; 19 } 20 21 /* 22 * Return TRUE if ADDR is the address of an RNAT slot. 23 */ 24 static inline uint64_t 25 rse_is_rnat_slot (uint64_t addr) 26 { 27 return rse_slot_num (addr) == 0x3f; 28 } 29 30 /* 31 * Returns the address of the RNAT slot that covers the slot at 32 * address SLOT_ADDR. 33 */ 34 static inline uint64_t 35 rse_rnat_addr (uint64_t slot_addr) 36 { 37 return slot_addr | (0x3f << 3); 38 } 39 40 /* 41 * Calculate the number of registers in the dirty partition starting at 42 * BSPSTORE and ending at BSP. This isn't simply (BSP-BSPSTORE)/8 43 * because every 64th slot stores ar.rnat. 44 */ 45 static inline uint64_t 46 rse_num_regs (uint64_t bspstore, uint64_t bsp) 47 { 48 uint64_t slots = (bsp - bspstore) >> 3; 49 50 return slots - (rse_slot_num(bspstore) + slots)/0x40; 51 } 52 53 /* 54 * The inverse of the above: given bspstore and the number of 55 * registers, calculate ar.bsp. 56 */ 57 static inline uint64_t 58 rse_skip_regs (uint64_t addr, long num_regs) 59 { 60 long delta = rse_slot_num(addr) + num_regs; 61 62 if (num_regs < 0) 63 delta -= 0x3e; 64 return addr + ((num_regs + delta/0x3f) << 3); 65 } 66 67 #endif /* RSE_H */ 68
