| /* Unaligned memory access functionality. |
| Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc. |
| Written by Ulrich Drepper <drepper@redhat.com>, 2001. |
| |
| This program is Open Source software; you can redistribute it and/or |
| modify it under the terms of the Open Software License version 1.0 as |
| published by the Open Source Initiative. |
| |
| You should have received a copy of the Open Software License along |
| with this program; if not, you may obtain a copy of the Open Software |
| License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 3001 King Ranch Road, Ukiah, CA 95482. */ |
| |
| #ifndef _MEMORY_ACCESS_H |
| #define _MEMORY_ACCESS_H 1 |
| |
| #include <byteswap.h> |
| #include <limits.h> |
| #include <stdint.h> |
| |
| |
| /* Number decoding macros. See 7.6 Variable Length Data. */ |
| |
| #define get_uleb128_step(var, addr, nth, break) \ |
| __b = *(addr)++; \ |
| var |= (uintmax_t) (__b & 0x7f) << (nth * 7); \ |
| if (likely ((__b & 0x80) == 0)) \ |
| break |
| |
| #define get_uleb128(var, addr) \ |
| do { \ |
| unsigned char __b; \ |
| var = 0; \ |
| get_uleb128_step (var, addr, 0, break); \ |
| var = __libdw_get_uleb128 (var, 1, &(addr)); \ |
| } while (0) |
| |
| #define get_uleb128_rest_return(var, i, addrp) \ |
| do { \ |
| for (; i < 10; ++i) \ |
| { \ |
| get_uleb128_step (var, *addrp, i, return var); \ |
| } \ |
| /* Other implementations set VALUE to UINT_MAX in this \ |
| case. So we better do this as well. */ \ |
| return UINT64_MAX; \ |
| } while (0) |
| |
| /* The signed case is similar, but we sign-extend the result. */ |
| |
| #define get_sleb128_step(var, addr, nth, break) \ |
| __b = *(addr)++; \ |
| _v |= (uint64_t) (__b & 0x7f) << (nth * 7); \ |
| if (likely ((__b & 0x80) == 0)) \ |
| { \ |
| var = (_v << (64 - (nth * 7) - 7) >> (64 - (nth * 7) - 7)); \ |
| break; \ |
| } \ |
| else do {} while (0) |
| |
| #define get_sleb128(var, addr) \ |
| do { \ |
| unsigned char __b; \ |
| int64_t _v = 0; \ |
| get_sleb128_step (var, addr, 0, break); \ |
| var = __libdw_get_sleb128 (_v, 1, &(addr)); \ |
| } while (0) |
| |
| #define get_sleb128_rest_return(var, i, addrp) \ |
| do { \ |
| for (; i < 9; ++i) \ |
| { \ |
| get_sleb128_step (var, *addrp, i, return var); \ |
| } \ |
| /* Other implementations set VALUE to INT_MAX in this \ |
| case. So we better do this as well. */ \ |
| return INT64_MAX; \ |
| } while (0) |
| |
| #ifdef IS_LIBDW |
| extern uint64_t __libdw_get_uleb128 (uint64_t acc, unsigned int i, |
| const unsigned char **addrp) |
| internal_function attribute_hidden; |
| extern int64_t __libdw_get_sleb128 (int64_t acc, unsigned int i, |
| const unsigned char **addrp) |
| internal_function attribute_hidden; |
| #else |
| static uint64_t |
| __attribute__ ((unused)) |
| __libdw_get_uleb128 (uint64_t acc, unsigned int i, const unsigned char **addrp) |
| { |
| unsigned char __b; |
| get_uleb128_rest_return (acc, i, addrp); |
| } |
| static int64_t |
| __attribute__ ((unused)) |
| __libdw_get_sleb128 (int64_t acc, unsigned int i, const unsigned char **addrp) |
| { |
| unsigned char __b; |
| int64_t _v = acc; |
| get_sleb128_rest_return (acc, i, addrp); |
| } |
| #endif |
| |
| |
| /* We use simple memory access functions in case the hardware allows it. |
| The caller has to make sure we don't have alias problems. */ |
| #if ALLOW_UNALIGNED |
| |
| # define read_2ubyte_unaligned(Dbg, Addr) \ |
| (unlikely ((Dbg)->other_byte_order) \ |
| ? bswap_16 (*((const uint16_t *) (Addr))) \ |
| : *((const uint16_t *) (Addr))) |
| # define read_2sbyte_unaligned(Dbg, Addr) \ |
| (unlikely ((Dbg)->other_byte_order) \ |
| ? (int16_t) bswap_16 (*((const int16_t *) (Addr))) \ |
| : *((const int16_t *) (Addr))) |
| |
| # define read_4ubyte_unaligned_noncvt(Addr) \ |
| *((const uint32_t *) (Addr)) |
| # define read_4ubyte_unaligned(Dbg, Addr) \ |
| (unlikely ((Dbg)->other_byte_order) \ |
| ? bswap_32 (*((const uint32_t *) (Addr))) \ |
| : *((const uint32_t *) (Addr))) |
| # define read_4sbyte_unaligned(Dbg, Addr) \ |
| (unlikely ((Dbg)->other_byte_order) \ |
| ? (int32_t) bswap_32 (*((const int32_t *) (Addr))) \ |
| : *((const int32_t *) (Addr))) |
| |
| # define read_8ubyte_unaligned(Dbg, Addr) \ |
| (unlikely ((Dbg)->other_byte_order) \ |
| ? bswap_64 (*((const uint64_t *) (Addr))) \ |
| : *((const uint64_t *) (Addr))) |
| # define read_8sbyte_unaligned(Dbg, Addr) \ |
| (unlikely ((Dbg)->other_byte_order) \ |
| ? (int64_t) bswap_64 (*((const int64_t *) (Addr))) \ |
| : *((const int64_t *) (Addr))) |
| |
| #else |
| |
| union unaligned |
| { |
| void *p; |
| uint16_t u2; |
| uint32_t u4; |
| uint64_t u8; |
| int16_t s2; |
| int32_t s4; |
| int64_t s8; |
| } __attribute__ ((packed)); |
| |
| static inline uint16_t |
| read_2ubyte_unaligned (Dwarf *dbg, const void *p) |
| { |
| const union unaligned *up = p; |
| if (dbg->other_byte_order) |
| return bswap_16 (up->u2); |
| return up->u2; |
| } |
| static inline int16_t |
| read_2sbyte_unaligned (Dwarf *dbg, const void *p) |
| { |
| const union unaligned *up = p; |
| if (dbg->other_byte_order) |
| return (int16_t) bswap_16 (up->u2); |
| return up->s2; |
| } |
| |
| static inline uint32_t |
| read_4ubyte_unaligned_noncvt (const void *p) |
| { |
| const union unaligned *up = p; |
| return up->u4; |
| } |
| static inline uint32_t |
| read_4ubyte_unaligned (Dwarf *dbg, const void *p) |
| { |
| const union unaligned *up = p; |
| if (dbg->other_byte_order) |
| return bswap_32 (up->u4); |
| return up->u4; |
| } |
| static inline int32_t |
| read_4sbyte_unaligned (Dwarf *dbg, const void *p) |
| { |
| const union unaligned *up = p; |
| if (dbg->other_byte_order) |
| return (int32_t) bswap_32 (up->u4); |
| return up->s4; |
| } |
| |
| static inline uint64_t |
| read_8ubyte_unaligned (Dwarf *dbg, const void *p) |
| { |
| const union unaligned *up = p; |
| if (dbg->other_byte_order) |
| return bswap_64 (up->u8); |
| return up->u8; |
| } |
| static inline int64_t |
| read_8sbyte_unaligned (Dwarf *dbg, const void *p) |
| { |
| const union unaligned *up = p; |
| if (dbg->other_byte_order) |
| return (int64_t) bswap_64 (up->u8); |
| return up->s8; |
| } |
| |
| #endif /* allow unaligned */ |
| |
| |
| #define read_2ubyte_unaligned_inc(Dbg, Addr) \ |
| ({ uint16_t t_ = read_2ubyte_unaligned (Dbg, Addr); \ |
| Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \ |
| t_; }) |
| #define read_2sbyte_unaligned_inc(Dbg, Addr) \ |
| ({ int16_t t_ = read_2sbyte_unaligned (Dbg, Addr); \ |
| Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \ |
| t_; }) |
| |
| #define read_4ubyte_unaligned_inc(Dbg, Addr) \ |
| ({ uint32_t t_ = read_4ubyte_unaligned (Dbg, Addr); \ |
| Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \ |
| t_; }) |
| #define read_4sbyte_unaligned_inc(Dbg, Addr) \ |
| ({ int32_t t_ = read_4sbyte_unaligned (Dbg, Addr); \ |
| Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \ |
| t_; }) |
| |
| #define read_8ubyte_unaligned_inc(Dbg, Addr) \ |
| ({ uint64_t t_ = read_8ubyte_unaligned (Dbg, Addr); \ |
| Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \ |
| t_; }) |
| #define read_8sbyte_unaligned_inc(Dbg, Addr) \ |
| ({ int64_t t_ = read_8sbyte_unaligned (Dbg, Addr); \ |
| Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \ |
| t_; }) |
| |
| #endif /* memory-access.h */ |