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/* SPDX-License-Identifier: GPL-2.0-or-later */
/***************************************************************************
* Copyright (C) 2004, 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007,2008 Øyvind Harboe *
* oyvind.harboe@zylin.com *
***************************************************************************/
#ifndef OPENOCD_HELPER_BINARYBUFFER_H
#define OPENOCD_HELPER_BINARYBUFFER_H
#include <helper/list.h>
#include <helper/types.h>
#define ERROR_INVALID_NUMBER (-1700)
#define ERROR_NUMBER_EXCEEDS_BUFFER (-1701)
/** @file
* Support functions to access arbitrary bits in a byte array
*/
/**
* Sets @c num bits in @c _buffer, starting at the @c first bit,
* using the bits in @c value. This routine fast-paths writes
* of little-endian, byte-aligned, 32-bit words.
* @param _buffer The buffer whose bits will be set.
* Do not use uninitialized buffer or clang static analyzer emits a warning.
* @param first The bit offset in @c _buffer to start writing (0-31).
* @param num The number of bits from @c value to copy (1-32).
* @param value Up to 32 bits that will be copied to _buffer.
*/
static inline void buf_set_u32(uint8_t *_buffer,
unsigned first, unsigned num, uint32_t value)
{
assert(num >= 1 && num <= 32);
uint8_t *buffer = _buffer;
if ((num == 32) && (first == 0)) {
buffer[3] = (value >> 24) & 0xff;
buffer[2] = (value >> 16) & 0xff;
buffer[1] = (value >> 8) & 0xff;
buffer[0] = (value >> 0) & 0xff;
} else {
for (unsigned i = first; i < first + num; i++) {
if (((value >> (i - first)) & 1) == 1)
buffer[i / 8] |= 1 << (i % 8);
else
buffer[i / 8] &= ~(1 << (i % 8));
}
}
}
/**
* Sets @c num bits in @c _buffer, starting at the @c first bit,
* using the bits in @c value. This routine fast-paths writes
* of little-endian, byte-aligned, 64-bit words.
* @param _buffer The buffer whose bits will be set.
* Do not use uninitialized buffer or clang static analyzer emits a warning.
* @param first The bit offset in @c _buffer to start writing (0-63).
* @param num The number of bits from @c value to copy (1-64).
* @param value Up to 64 bits that will be copied to _buffer.
*/
static inline void buf_set_u64(uint8_t *_buffer,
unsigned first, unsigned num, uint64_t value)
{
assert(num >= 1 && num <= 64);
uint8_t *buffer = _buffer;
if ((num == 32) && (first == 0)) {
buffer[3] = (value >> 24) & 0xff;
buffer[2] = (value >> 16) & 0xff;
buffer[1] = (value >> 8) & 0xff;
buffer[0] = (value >> 0) & 0xff;
} else if ((num == 64) && (first == 0)) {
buffer[7] = (value >> 56) & 0xff;
buffer[6] = (value >> 48) & 0xff;
buffer[5] = (value >> 40) & 0xff;
buffer[4] = (value >> 32) & 0xff;
buffer[3] = (value >> 24) & 0xff;
buffer[2] = (value >> 16) & 0xff;
buffer[1] = (value >> 8) & 0xff;
buffer[0] = (value >> 0) & 0xff;
} else {
for (unsigned i = first; i < first + num; i++) {
if (((value >> (i - first)) & 1) == 1)
buffer[i / 8] |= 1 << (i % 8);
else
buffer[i / 8] &= ~(1 << (i % 8));
}
}
}
/**
* Retrieves @c num bits from @c _buffer, starting at the @c first bit,
* returning the bits in a 32-bit word. This routine fast-paths reads
* of little-endian, byte-aligned, 32-bit words.
* @param _buffer The buffer whose bits will be read.
* @param first The bit offset in @c _buffer to start reading (0-31).
* @param num The number of bits from @c _buffer to read (1-32).
* @returns Up to 32-bits that were read from @c _buffer.
*/
static inline uint32_t buf_get_u32(const uint8_t *_buffer,
unsigned first, unsigned num)
{
assert(num >= 1 && num <= 32);
const uint8_t *buffer = _buffer;
if ((num == 32) && (first == 0)) {
return (((uint32_t)buffer[3]) << 24) |
(((uint32_t)buffer[2]) << 16) |
(((uint32_t)buffer[1]) << 8) |
(((uint32_t)buffer[0]) << 0);
} else {
uint32_t result = 0;
for (unsigned i = first; i < first + num; i++) {
if (((buffer[i / 8] >> (i % 8)) & 1) == 1)
result |= 1U << (i - first);
}
return result;
}
}
/**
* Retrieves @c num bits from @c _buffer, starting at the @c first bit,
* returning the bits in a 64-bit word. This routine fast-paths reads
* of little-endian, byte-aligned, 64-bit words.
* @param _buffer The buffer whose bits will be read.
* @param first The bit offset in @c _buffer to start reading (0-63).
* @param num The number of bits from @c _buffer to read (1-64).
* @returns Up to 64-bits that were read from @c _buffer.
*/
static inline uint64_t buf_get_u64(const uint8_t *_buffer,
unsigned first, unsigned num)
{
assert(num >= 1 && num <= 64);
const uint8_t *buffer = _buffer;
if ((num == 32) && (first == 0)) {
return 0 + ((((uint32_t)buffer[3]) << 24) | /* Note - zero plus is to avoid a checkpatch bug */
(((uint32_t)buffer[2]) << 16) |
(((uint32_t)buffer[1]) << 8) |
(((uint32_t)buffer[0]) << 0));
} else if ((num == 64) && (first == 0)) {
return 0 + ((((uint64_t)buffer[7]) << 56) | /* Note - zero plus is to avoid a checkpatch bug */
(((uint64_t)buffer[6]) << 48) |
(((uint64_t)buffer[5]) << 40) |
(((uint64_t)buffer[4]) << 32) |
(((uint64_t)buffer[3]) << 24) |
(((uint64_t)buffer[2]) << 16) |
(((uint64_t)buffer[1]) << 8) |
(((uint64_t)buffer[0]) << 0));
} else {
uint64_t result = 0;
for (unsigned i = first; i < first + num; i++) {
if (((buffer[i / 8] >> (i % 8)) & 1) == 1)
result = result | ((uint64_t)1 << (uint64_t)(i - first));
}
return result;
}
}
/**
* Inverts the ordering of bits inside a 32-bit word (e.g. 31..0 -> 0..31).
* This routine can be used to flip smaller data types by using smaller
* values for @c width.
* @param value The word to flip.
* @param width The number of bits in value (2-32).
* @returns A 32-bit word with @c value in reversed bit-order.
*/
uint32_t flip_u32(uint32_t value, unsigned width);
bool buf_cmp(const void *buf1, const void *buf2, unsigned size);
bool buf_cmp_mask(const void *buf1, const void *buf2,
const void *mask, unsigned size);
/**
* Copies @c size bits out of @c from and into @c to. Any extra
* bits in the final byte will be set to zero.
* @param from The buffer to copy into @c to.
* @param to The buffer that will receive the copy of @c from.
* @param size The number of bits to copy.
*/
void *buf_cpy(const void *from, void *to, unsigned size);
/**
* Set the contents of @c buf with @c count bits, all set to 1.
* @param buf The buffer to fill with ones.
* @param size The number of bits.
* @returns The original buffer (@c buf).
*/
void *buf_set_ones(void *buf, unsigned size);
void *buf_set_buf(const void *src, unsigned src_start,
void *dst, unsigned dst_start, unsigned len);
/**
* Parse an unsigned number (provided as a zero-terminated string)
* into a bit buffer whose size is buf_len bits. The base of the
* number is detected between decimal, hexadecimal and octal.
* @param str Input number, zero-terminated string
* @param _buf Output buffer, allocated by the caller
* @param buf_bitsize Output buffer size in bits
* @returns Error on invalid or overflowing number
*/
int str_to_buf(const char *str, void *_buf, unsigned int buf_bitsize);
char *buf_to_hex_str(const void *buf, unsigned size);
/* read a uint32_t from a buffer in target memory endianness */
static inline uint32_t fast_target_buffer_get_u32(const void *p, bool le)
{
return le ? le_to_h_u32(p) : be_to_h_u32(p);
}
static inline void bit_copy(uint8_t *dst, unsigned dst_offset, const uint8_t *src,
unsigned src_offset, unsigned bit_count)
{
buf_set_buf(src, src_offset, dst, dst_offset, bit_count);
}
struct bit_copy_queue {
struct list_head list;
};
struct bit_copy_queue_entry {
uint8_t *dst;
unsigned dst_offset;
const uint8_t *src;
unsigned src_offset;
unsigned bit_count;
struct list_head list;
};
void bit_copy_queue_init(struct bit_copy_queue *q);
int bit_copy_queued(struct bit_copy_queue *q, uint8_t *dst, unsigned dst_offset, const uint8_t *src,
unsigned src_offset, unsigned bit_count);
void bit_copy_execute(struct bit_copy_queue *q);
void bit_copy_discard(struct bit_copy_queue *q);
/* functions to convert to/from hex encoded buffer
* used in ti-icdi driver and gdb server */
size_t unhexify(uint8_t *bin, const char *hex, size_t count);
size_t hexify(char *hex, const uint8_t *bin, size_t count, size_t out_maxlen);
void buffer_shr(void *_buf, unsigned buf_len, unsigned count);
#endif /* OPENOCD_HELPER_BINARYBUFFER_H */
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