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 int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, 36 u32 *addr, u32 *persistent) 37 { 38 u32 *p = (__force u32 *)rp; 39 40 /* Is it a split 64/32 reference? */ 41 if (relval & 0x80000000) { 42 /* Grab the two halves of the reference */ 43 u32 val_hi, val_lo; 44 45 val_hi = get_unaligned(p); 46 val_lo = get_unaligned(p+1); 47 48 /* Crack the address out */ 49 *addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff); 50 } else { 51 /* Get the address straight out */ 52 *addr = get_unaligned(p); 53 } 54 55 return 0; 56 } 57 58 /* 59 * Insert an address into the symbol reference at rp. rp is potentially 60 * unaligned. 61 */ 62 63 static inline int 64 flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 relval) 65 { 66 u32 *p = (__force u32 *)rp; 67 /* Is this a split 64/32 reloc? */ 68 if (relval & 0x80000000) { 69 /* Get the two "halves" */ 70 unsigned long val_hi = get_unaligned(p); 71 unsigned long val_lo = get_unaligned(p + 1); 72 73 /* insert the address */ 74 val_hi = (val_hi & 0xffff0000) | addr >> 16; 75 val_lo = (val_lo & 0xffff0000) | (addr & 0xffff); 76 77 /* store the two halves back into memory */ 78 put_unaligned(val_hi, p); 79 put_unaligned(val_lo, p+1); 80 } else { 81 /* Put it straight in, no messing around */ 82 put_unaligned(addr, p); 83 } 84 return 0; 85 } 86 87 #define flat_get_relocate_addr(rel) (rel & 0x7fffffff) 88 89 #endif /* _ASM_MICROBLAZE_FLAT_H */ 90