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/* Low-level RSP routines for GDB, the GNU debugger.
Copyright (C) 1988-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common-defs.h"
#include "rsp-low.h"
/* See rsp-low.h. */
int
tohex (int nib)
{
if (nib < 10)
return '0' + nib;
else
return 'a' + nib - 10;
}
/* Encode 64 bits in 16 chars of hex. */
static const char hexchars[] = "0123456789abcdef";
static int
ishex (int ch, int *val)
{
if ((ch >= 'a') && (ch <= 'f'))
{
*val = ch - 'a' + 10;
return 1;
}
if ((ch >= 'A') && (ch <= 'F'))
{
*val = ch - 'A' + 10;
return 1;
}
if ((ch >= '0') && (ch <= '9'))
{
*val = ch - '0';
return 1;
}
return 0;
}
/* See rsp-low.h. */
char *
pack_nibble (char *buf, int nibble)
{
*buf++ = hexchars[(nibble & 0x0f)];
return buf;
}
/* See rsp-low.h. */
char *
pack_hex_byte (char *pkt, int byte)
{
*pkt++ = hexchars[(byte >> 4) & 0xf];
*pkt++ = hexchars[(byte & 0xf)];
return pkt;
}
/* See rsp-low.h. */
const char *
unpack_varlen_hex (const char *buff, /* packet to parse */
ULONGEST *result)
{
int nibble;
ULONGEST retval = 0;
while (ishex (*buff, &nibble))
{
buff++;
retval = retval << 4;
retval |= nibble & 0x0f;
}
*result = retval;
return buff;
}
/* See rsp-low.h. */
std::string
hex2str (const char *hex)
{
return hex2str (hex, strlen (hex));
}
/* See rsp-low.h. */
std::string
hex2str (const char *hex, int count)
{
std::string ret;
ret.reserve (count);
for (size_t i = 0; i < count; ++i)
{
if (hex[0] == '\0' || hex[1] == '\0')
{
/* Hex string is short, or of uneven length. Return what we
have so far. */
return ret;
}
ret += fromhex (hex[0]) * 16 + fromhex (hex[1]);
hex += 2;
}
return ret;
}
/* See rsp-low.h. */
int
bin2hex (const gdb_byte *bin, char *hex, int count)
{
int i;
for (i = 0; i < count; i++)
{
*hex++ = tohex ((*bin >> 4) & 0xf);
*hex++ = tohex (*bin++ & 0xf);
}
*hex = 0;
return i;
}
/* See rsp-low.h. */
std::string
bin2hex (const gdb_byte *bin, int count)
{
std::string ret;
ret.reserve (count * 2);
for (int i = 0; i < count; ++i)
{
ret += tohex ((*bin >> 4) & 0xf);
ret += tohex (*bin++ & 0xf);
}
return ret;
}
/* Return whether byte B needs escaping when sent as part of binary data. */
static int
needs_escaping (gdb_byte b)
{
return b == '$' || b == '#' || b == '}' || b == '*';
}
/* See rsp-low.h. */
int
remote_escape_output (const gdb_byte *buffer, int len_units, int unit_size,
gdb_byte *out_buf, int *out_len_units,
int out_maxlen_bytes)
{
int input_unit_index, output_byte_index = 0, byte_index_in_unit;
int number_escape_bytes_needed;
/* Try to copy integral addressable memory units until
(1) we run out of space or
(2) we copied all of them. */
for (input_unit_index = 0;
input_unit_index < len_units;
input_unit_index++)
{
/* Find out how many escape bytes we need for this unit. */
number_escape_bytes_needed = 0;
for (byte_index_in_unit = 0;
byte_index_in_unit < unit_size;
byte_index_in_unit++)
{
int idx = input_unit_index * unit_size + byte_index_in_unit;
gdb_byte b = buffer[idx];
if (needs_escaping (b))
number_escape_bytes_needed++;
}
/* Check if we have room to fit this escaped unit. */
if (output_byte_index + unit_size + number_escape_bytes_needed >
out_maxlen_bytes)
break;
/* Copy the unit byte per byte, adding escapes. */
for (byte_index_in_unit = 0;
byte_index_in_unit < unit_size;
byte_index_in_unit++)
{
int idx = input_unit_index * unit_size + byte_index_in_unit;
gdb_byte b = buffer[idx];
if (needs_escaping (b))
{
out_buf[output_byte_index++] = '}';
out_buf[output_byte_index++] = b ^ 0x20;
}
else
out_buf[output_byte_index++] = b;
}
}
*out_len_units = input_unit_index;
return output_byte_index;
}
/* See rsp-low.h. */
int
remote_unescape_input (const gdb_byte *buffer, int len,
gdb_byte *out_buf, int out_maxlen)
{
int input_index, output_index;
int escaped;
output_index = 0;
escaped = 0;
for (input_index = 0; input_index < len; input_index++)
{
gdb_byte b = buffer[input_index];
if (output_index + 1 > out_maxlen)
error (_("Received too much data from the target."));
if (escaped)
{
out_buf[output_index++] = b ^ 0x20;
escaped = 0;
}
else if (b == '}')
escaped = 1;
else
out_buf[output_index++] = b;
}
if (escaped)
error (_("Unmatched escape character in target response."));
return output_index;
}
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