Initial implementation of Bare Metal Mode for NaCl.

components/nacl.gyp

Index: components/nacl.gyp
diff --git a/components/nacl.gyp b/components/nacl.gyp
index 361ac061d2f5cd92a36d93dc7be78d6446d81754..817020e073cda424284e73a1bce198d10490d3b7 100644
--- a/components/nacl.gyp
+++ b/components/nacl.gyp
@@ -5,6 +5,7 @@
 {
   'variables': {
     'chromium_code': 1,
+    'enable_bare_metal_nacl': 0,

[Mark Seaborn, 2013/12/06 03:21:16]

If we're going to test Bare Metal Mode on the Chromium buildbots (which should
happen in a later CL but not the first CL), then it can't require a build-time
flag to enable it.  It will require a run time flag instead.

So, please remove this line.  We'll at least be compile-testing on the Chromium
bots in the first CL. :-)  This means you should also run the CL through the
trybots.

[hidehiko, 2013/12/06 17:40:02]

Done.

   },
   'includes': [
     'nacl/nacl_defines.gypi',
@@ -212,6 +213,17 @@
                     }],
                   ],
                 }],
+                ['enable_bare_metal_nacl == 1', {

[Mark Seaborn, 2013/12/06 03:21:16]

So this should just be 'os_linux==1' instead.

[hidehiko, 2013/12/06 17:40:02]

Done. Note that OS == linux is checked by enclosing condition. We also need to
restrict to ia32 arch for bare metal, now.

+                  'sources': [
+                    # Bare Metal Mode is currently experimental and available
+                    # only for linux environment.
+                    'nacl/loader/bare_metal/bare_metal_error_code.h',

[Mark Seaborn, 2013/12/06 03:21:16]

On naming: I was thinking about calling this "nonsfi" rather than "bare_metal"
in the code.

The term "bare metal" isn't really accurate because it means "without an
operating system".  It's OK as a project name, but for the codebase I think it
would be more descriptive to use the term "non-SFI".  What do you think?

[hidehiko, 2013/12/06 17:40:02]

Indeed. Done. Renamed all Bare Metal to Non SFI.

+                    'nacl/loader/bare_metal/bare_metal_main.c',
+                    'nacl/loader/bare_metal/bare_metal_main.h',
+                    'nacl/loader/bare_metal/elf_util.c',
+                    'nacl/loader/bare_metal/elf_util.h',
+                  ],
+                }]
               ],
               'cflags': ['-fPIE'],
               'link_settings': {