)]}'
{
  "commit": "577eebeae34d340685d8985dfdb7dfe337c511e8",
  "tree": "047aa135d143ed12035ca04433e563b948f9b059",
  "parents": [
    "e07cccf4046978df10f2e13fe2b99b2f9b3a65db"
  ],
  "author": {
    "name": "Jeremy Fitzhardinge",
    "email": "jeremy.fitzhardinge@citrix.com",
    "time": "Thu Aug 27 12:46:35 2009 -0700"
  },
  "committer": {
    "name": "Jeremy Fitzhardinge",
    "email": "jeremy.fitzhardinge@citrix.com",
    "time": "Wed Sep 09 16:37:39 2009 -0700"
  },
  "message": "xen: make -fstack-protector work under Xen\n\n-fstack-protector uses a special per-cpu \"stack canary\" value.\ngcc generates special code in each function to test the canary to make\nsure that the function\u0027s stack hasn\u0027t been overrun.\n\nOn x86-64, this is simply an offset of %gs, which is the usual per-cpu\nbase segment register, so setting it up simply requires loading %gs\u0027s\nbase as normal.\n\nOn i386, the stack protector segment is %gs (rather than the usual kernel\npercpu %fs segment register).  This requires setting up the full kernel\nGDT and then loading %gs accordingly.  We also need to make sure %gs is\ninitialized when bringing up secondary cpus too.\n\nTo keep things consistent, we do the full GDT/segment register setup on\nboth architectures.\n\nBecause we need to avoid -fstack-protected code before setting up the GDT\nand because there\u0027s no way to disable it on a per-function basis, several\nfiles need to have stack-protector inhibited.\n\n[ Impact: allow Xen booting with stack-protector enabled ]\n\nSigned-off-by: Jeremy Fitzhardinge \u003cjeremy.fitzhardinge@citrix.com\u003e\n",
  "tree_diff": [
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}