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This patch adds some testcases for dtc's -Oasm mode. Specifically it checks that building the asm will result in the same device tree blob in memory as -Odtb mode would produce, for a variety of trees. This test uncovered two difficulties with our current -Oasm output, both of which are addressed in this patch as well. First, -Oasm output would only be correct if assembled for a big-endian target. Usually that would be the case, when building device trees into a firmware or similar. However this makes life inconvenient for testing on a little-endian target, and one can think up use cases where a program running on a little endian host might want to embed a device tree for a big-endian target. This patch therefore changes -Oasm output to use .byte directives instead of .long throughout in order to generate byte-for-byte identical trees regardless of the endianness of the assembler target. Second, -Oasm output emitted several #define statements which were then used in the innards of the output - i.e. it assumed the output would be processed by cpp before being assembled. That may not be convenient in all build environments, and in any case doesn't work well with the above fix. So, -Oasm output no longer needs to be preprocessed before assembling. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>main
David Gibson
16 years ago
committed by
Jon Loeliger
6 changed files with 146 additions and 39 deletions
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/* |
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* libfdt - Flat Device Tree manipulation |
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* Tests if an asm tree built into a shared object matches a given dtb |
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* Copyright (C) 2008 David Gibson, IBM Corporation. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public License |
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* as published by the Free Software Foundation; either version 2.1 of |
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* the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdint.h> |
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#include <errno.h> |
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#include <dlfcn.h> |
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#include <fdt.h> |
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#include <libfdt.h> |
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#include "tests.h" |
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#include "testdata.h" |
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int main(int argc, char *argv[]) |
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{ |
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void *sohandle; |
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void *fdt; |
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int err; |
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test_init(argc, argv); |
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if (argc != 3) |
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CONFIG("Usage: %s <so file> <dtb file>", argv[0]); |
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sohandle = dlopen(argv[1], RTLD_NOW); |
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if (!sohandle) |
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FAIL("Couldn't dlopen() %s", argv[1]); |
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fdt = dlsym(sohandle, "dt_blob_start"); |
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if (!fdt) |
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FAIL("Couldn't locate \"dt_blob_start\" symbol in %s", |
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argv[1]); |
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err = fdt_check_header(fdt); |
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if (err != 0) |
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FAIL("%s contains invalid tree: %s", argv[1], |
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fdt_strerror(err)); |
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save_blob(argv[2], fdt); |
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PASS(); |
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} |
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/* Used in combination with dtc -Oasm output to embed |
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* a device tree in the data section of a .o */ |
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.data |
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