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The Go programming language
a9b2651ade
NaCl requires the addition of a 32-byte "halt sled" at the end of the text segment. This means that segtext.len is actually 32 bytes shorter than reality. The computation of the file offset of the end of the data segment did not take this 32 bytes into account, so if len and len+32 rounded up (by 64k) to different values, the symbol table overwrote the last page of the data segment. The last page of the data segment is usually the C .string symbols, which contain the strings used in error prints by the runtime. So when this happens, your program probably crashes, and then when it does, you get binary garbage instead of all the usual prints. The chance of hitting this with a randomly sized text segment is 32 in 65536, or 1 in 2048. If you add or remove ANY code while trying to debug this problem, you're overwhelmingly likely to bump the text segment one way or the other and make the bug disappear. Correct all the computations to use segdata.fileoff+segdata.filelen instead of trying to rederive segdata.fileoff. This fixes the failure during the nacl/amd64p32 build. TBR=iant CC=golang-codereviews https://golang.org/cl/135050043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install-source.html
in your web browser.
After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.