1 /* 2 * uClinux flat-format executables 3 * 4 * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au> 5 * 6 * This file is subject to the terms and conditions of the GNU General 7 * Public License. See the file COPYING in the main directory of this 8 * archive for more details. 9 */ 10 11 #ifndef _ASM_MICROBLAZE_FLAT_H 12 #define _ASM_MICROBLAZE_FLAT_H 13 14 #include <asm/unaligned.h> 15 16 #define flat_argvp_envp_on_stack() 0 17 #define flat_old_ram_flag(flags) (flags) 18 #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) 19 #define flat_set_persistent(relval, p) 0 20 21 /* 22 * Microblaze works a little differently from other arches, because 23 * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split 24 * over two instructions, an 'imm' instruction which provides the top 25 * 16 bits, then the instruction "proper" which provides the low 16 26 * bits. 27 */ 28 29 /* 30 * Crack open a symbol reference and extract the address to be 31 * relocated. rp is a potentially unaligned pointer to the 32 * reference 33 */ 34 35 static inline unsigned long 36 flat_get_addr_from_rp(unsigned long *rp, unsigned long relval, 37 unsigned long flags, unsigned long *persistent) 38 { 39 unsigned long addr; 40 (void)flags; 41 42 /* Is it a split 64/32 reference? */ 43 if (relval & 0x80000000) { 44 /* Grab the two halves of the reference */ 45 unsigned long val_hi, val_lo; 46 47 val_hi = get_unaligned(rp); 48 val_lo = get_unaligned(rp+1); 49 50 /* Crack the address out */ 51 addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff); 52 } else { 53 /* Get the address straight out */ 54 addr = get_unaligned(rp); 55 } 56 57 return addr; 58 } 59 60 /* 61 * Insert an address into the symbol reference at rp. rp is potentially 62 * unaligned. 63 */ 64 65 static inline void 66 flat_put_addr_at_rp(unsigned long *rp, unsigned long addr, unsigned long relval) 67 { 68 /* Is this a split 64/32 reloc? */ 69 if (relval & 0x80000000) { 70 /* Get the two "halves" */ 71 unsigned long val_hi = get_unaligned(rp); 72 unsigned long val_lo = get_unaligned(rp + 1); 73 74 /* insert the address */ 75 val_hi = (val_hi & 0xffff0000) | addr >> 16; 76 val_lo = (val_lo & 0xffff0000) | (addr & 0xffff); 77 78 /* store the two halves back into memory */ 79 put_unaligned(val_hi, rp); 80 put_unaligned(val_lo, rp+1); 81 } else { 82 /* Put it straight in, no messing around */ 83 put_unaligned(addr, rp); 84 } 85 } 86 87 #define flat_get_relocate_addr(rel) (rel & 0x7fffffff) 88 89 #endif /* _ASM_MICROBLAZE_FLAT_H */ 90