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GDBserver remote packet support for memory tagging

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This patch adds the generic remote bits to gdbserver so it can check for memory
tagging support and handle fetch tags and store tags requests.

gdbserver/ChangeLog:

2021-03-24  Luis Machado  <luis.machado@linaro.org>

	* remote-utils.cc (decode_m_packet_params): Renamed from ...
	(decode_m_packet): ... this, which now calls decode_m_packet_params.
	Make char * param/return const char *.
	(decode_M_packet): Use decode_m_packet_params and make char * param
	const char *.
	* remote-utils.h (decode_m_packet_params): New prototype.
	(decode_m_packet): Constify char pointers.
	(decode_M_packet): Likewise.
	* server.cc (create_fetch_memtags_reply)
	(parse_store_memtags_request): New
	functions.
	(handle_general_set): Handle the QMemTags packet.
	(parse_fetch_memtags_request): New function.
	(handle_query): Handle the qMemTags packet and advertise memory
	tagging support.
	(captured_main): Initialize memory tagging flag.
	* server.h (struct client_state): Initialize memory tagging flag.
	* target.cc (process_stratum_target::supports_memory_tagging)
	(process_stratum_target::fetch_memtags)
	(process_stratum_target::store_memtags): New methods.
	* target.h: Include gdbsupport/byte-vector.h.
	(class process_stratum_target) <supports_memory_tagging>
	<fetch_memtags, store_memtags>: New class virtual methods.
	(target_supports_memory_tagging): Define.
This commit is contained in:
Luis Machado 2020-06-15 15:34:06 -03:00
parent 754487e200
commit 546b77fe78
7 changed files with 243 additions and 28 deletions
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48
gdbserver/remote-utils.cc
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@ -1308,31 +1308,11 @@ prepare_resume_reply (char *buf, ptid_t ptid,
}
}
void
decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr)
{
int i = 0, j = 0;
char ch;
*mem_addr_ptr = *len_ptr = 0;
/* See remote-utils.h. */
while ((ch = from[i++]) != ',')
{
*mem_addr_ptr = *mem_addr_ptr << 4;
*mem_addr_ptr |= fromhex (ch) & 0x0f;
}
for (j = 0; j < 4; j++)
{
if ((ch = from[i++]) == 0)
break;
*len_ptr = *len_ptr << 4;
*len_ptr |= fromhex (ch) & 0x0f;
}
}
void
decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr,
unsigned char **to_p)
const char *
decode_m_packet_params (const char *from, CORE_ADDR *mem_addr_ptr,
unsigned int *len_ptr, const char end_marker)
{
int i = 0;
char ch;
@ -1344,16 +1324,32 @@ decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr,
*mem_addr_ptr |= fromhex (ch) & 0x0f;
}
while ((ch = from[i++]) != ':')
while ((ch = from[i++]) != end_marker)
{
*len_ptr = *len_ptr << 4;
*len_ptr |= fromhex (ch) & 0x0f;
}
return from + i;
}
void
decode_m_packet (const char *from, CORE_ADDR *mem_addr_ptr,
unsigned int *len_ptr)
{
decode_m_packet_params (from, mem_addr_ptr, len_ptr, '\0');
}
void
decode_M_packet (const char *from, CORE_ADDR *mem_addr_ptr,
unsigned int *len_ptr, unsigned char **to_p)
{
from = decode_m_packet_params (from, mem_addr_ptr, len_ptr, ':');
if (*to_p == NULL)
*to_p = (unsigned char *) xmalloc (*len_ptr);
hex2bin (&from[i++], *to_p, *len_ptr);
hex2bin (from, *to_p, *len_ptr);
}
int