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author | Andrew Cagney <cagney@redhat.com> | 2000-04-07 01:33:18 +0000 |
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committer | Andrew Cagney <cagney@redhat.com> | 2000-04-07 01:33:18 +0000 |
commit | 6cf7e474338f186fbf2bbffcefb8715f11412b6b (patch) | |
tree | ba754e28c8f854c89f7095887a95ca171ab64c70 /gdb/doc | |
parent | 6abadcf80ea7ffe581cc04ddd2658faff5ac4a07 (diff) | |
download | binutils-6cf7e474338f186fbf2bbffcefb8715f11412b6b.zip binutils-6cf7e474338f186fbf2bbffcefb8715f11412b6b.tar.gz binutils-6cf7e474338f186fbf2bbffcefb8715f11412b6b.tar.bz2 |
Deprecate sequence-id's.
Diffstat (limited to 'gdb/doc')
-rw-r--r-- | gdb/doc/gdb.texinfo | 56 |
1 files changed, 27 insertions, 29 deletions
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 4308756..3b81c12 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -8851,35 +8851,36 @@ transmitted and received data respectfully. @cindex protocol, @value{GDBN} remote serial @cindex serial protocol, @value{GDBN} remote @cindex remote serial protocol -All @value{GDBN} commands and responses (other than acknowledgments) -are sent as a @var{packet}. A @var{packet} is introduced with the -character @samp{$}, this is followed by an optional two-digit -@var{sequence-id} and the character @samp{:}, the actual -@var{packet-data}, and the terminating character @samp{#} followed by a -two-digit @var{checksum}: +All @value{GDBN} commands and responses (other than acknowledgments) are +sent as a @var{packet}. A @var{packet} is introduced with the character +@samp{$}, the actual @var{packet-data}, and the terminating character +@samp{#} followed by a two-digit @var{checksum}: @example @code{$}@var{packet-data}@code{#}@var{checksum} @end example @noindent -or, with the optional @var{sequence-id}: -@example -@code{$}@var{sequence-id}@code{:}@var{packet-data}@code{#}@var{checksum} -@end example @cindex checksum, for @value{GDBN} remote @noindent The two-digit @var{checksum} is computed as the modulo 256 sum of all -characters between the leading @samp{$} and the trailing @samp{#} (that -consisting of both the optional @var{sequence-id}@code{:} and the actual -@var{packet-data}) (an eight bit unsigned checksum). +characters between the leading @samp{$} and the trailing @samp{#} (an +eight bit unsigned checksum). + +Implementors should note that prior to @value{GDBN} 5.0 the protocol +specification also included an optional two-digit @var{sequence-id}: + +@example +@code{$}@var{sequence-id}@code{:}@var{packet-data}@code{#}@var{checksum} +@end example @cindex sequence-id, for @value{GDBN} remote @noindent -The two-digit @var{sequence-id}, when present, is returned with the -acknowledgment. Beyond that its meaning is poorly defined. -@value{GDBN} is not known to output @var{sequence-id}s. +That @var{sequence-id} was appended to the acknowledgment. @value{GDBN} +has never output @var{sequence-id}s. Stubs that handle packets added +since @value{GDBN} 5.0 must not accept @var{sequence-id}. +@cindex acknowledgment, for @value{GDBN} remote When either the host or the target machine receives a packet, the first response expected is an acknowledgment: either @samp{+} (to indicate the package was received correctly) or @samp{-} (to request @@ -8890,13 +8891,6 @@ retransmission): -> @code{+} @end example @noindent -If the received packet included a @var{sequence-id} than that is -appended to a positive acknowledgment: - -@example -<- @code{$}@var{sequence-id}@code{:}@var{packet-data}@code{#}@var{checksum} --> @code{+}@var{sequence-id} -@end example The host (@value{GDBN}) sends @var{command}s, and the target (the debugging stub incorporated in your program) sends a @var{response}. In @@ -8904,12 +8898,16 @@ the case of step and continue @var{command}s, the response is only sent when the operation has completed (the target has again stopped). @var{packet-data} consists of a sequence of characters with the -exception of @samp{#} and @samp{$} (see @samp{X} packet for an -exception). @samp{:} can not appear as the third character in a packet. -Fields within the packet should be separated using @samp{,} and @samp{;} -(unfortunately some packets chose to use @samp{:}). Except where -otherwise noted all numbers are represented in HEX with leading zeros -suppressed. +exception of @samp{#} and @samp{$} (see @samp{X} packet for additional +exceptions). + +Fields within the packet should be separated using @samp{,} @samp{;} or +@samp{:}. Except where otherwise noted all numbers are represented in +HEX with leading zeros suppressed. + +Implementors should note that prior to @value{GDBN} 5.0, the character +@samp{:} could not appear as the third character in a packet (as it +would potentially conflict with the @var{sequence-id}). Response @var{data} can be run-length encoded to save space. A @samp{*} means that the next character is an @sc{ascii} encoding giving a repeat count |