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misc/nacl: add debugging instructions

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LGTM=dave, minux
R=golang-codereviews, dave, minux
CC=golang-codereviews, rsc
https://golang.org/cl/122570043
This commit is contained in:
Dmitriy Vyukov 2014-08-15 20:51:44 +04:00
parent a18a360379
commit fb0b923f67
1 changed files with 31 additions and 3 deletions
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34
misc/nacl/README
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@ -37,7 +37,7 @@ sdk. These are released every 6-8 weeks, in line with Chrome releases.
% cd /opt/nacl_sdk
% ./naclsdk update
At this time pepper_33 is the stable version. If naclsdk downloads a later
At this time pepper_34 is the stable version. If naclsdk downloads a later
version, please adjust accordingly. As of June 2014, only the canary sdk
provides support for nacl/arm.
@ -45,8 +45,8 @@ The cmd/go helper scripts expect that the loaders sel_ldr_{x86_{32,64},arm} and
nacl_helper_bootstrap_arm are in your path. I find it easiest to make a symlink
from the NaCl distribution to my $GOPATH/bin directory.
% ln -nfs /opt/nacl_sdk/pepper_33/tools/sel_ldr_x86_32 $GOPATH/bin/sel_ldr_x86_32
% ln -nfs /opt/nacl_sdk/pepper_33/tools/sel_ldr_x86_64 $GOPATH/bin/sel_ldr_x86_64
% ln -nfs /opt/nacl_sdk/pepper_34/tools/sel_ldr_x86_32 $GOPATH/bin/sel_ldr_x86_32
% ln -nfs /opt/nacl_sdk/pepper_34/tools/sel_ldr_x86_64 $GOPATH/bin/sel_ldr_x86_64
% ln -nfs /opt/nacl_sdk/pepper_canary/tools/sel_ldr_arm $GOPATH/bin/sel_ldr_arm
Additionally, for NaCl/ARM only:
@ -92,3 +92,31 @@ tests.
% cd go/src
% env GOARCH=amd64p32 ./nacltest.bash
Debugging
---------
Assuming that you have built nacl/amd64p32 binary ./mybin and can run as:
% sel_ldr_x86_64 -l /dev/null -S -e ./mybin
Create the nacl manifest file mybin.manifest with the following contents:
{ "program": { "x86-64": { "url": "mybin" } } }
url is the path to the binary relative to the manifest file.
Then, run the program as:
% sel_ldr_x86_64 -g -l /dev/null -S -e ./mybin
The -g flag instructs the loader to stop at startup. Then, in another console:
% /opt/nacl_sdk/pepper_34/toolchain/linux_x86_glibc/bin/x86_64-nacl-gdb
% nacl-manifest mybin.manifest
% target remote :4014
If you see that the program is stopped in _rt0_amd64p32_nacl, then symbols are
loaded successfully and you can type 'c' to start the program.
Next time you can automate it as:
% /opt/nacl_sdk/pepper_34/toolchain/linux_x86_glibc/bin/x86_64-nacl-gdb \
-ex 'nacl-manifest mybin.manifest' -ex 'target remote :4014'