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dtc: Make asm output more portable and add testcases

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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>
This commit is contained in:
David Gibson 2009-01-08 11:47:55 +11:00 • committed by Jon Loeliger
parent b2b4990bbf
commit 26d93f6c92
6 changed files with 149 additions and 42 deletions
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19
tests/run_tests.sh
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@ -71,6 +71,15 @@ run_dtc_test () {
base_run_test wrap_test $VALGRIND $DTC "$@"
}
asm_to_so () {
as -o $1.test.o data.S $1.test.s && \
ld -shared -o $1.test.so $1.test.o
}
asm_to_so_test () {
run_wrap_test asm_to_so "$@"
}
tree1_tests () {
TREE=$1
@ -228,6 +237,16 @@ dtc_tests () {
run_dtc_test -I dtb -O dtb -o boot_cpuid_preserved_test_tree1.test.dtb boot_cpuid_test_tree1.test.dtb
run_test dtbs_equal_ordered boot_cpuid_preserved_test_tree1.test.dtb boot_cpuid_test_tree1.test.dtb
# Check -Oasm mode
for tree in test_tree1.dts escapes.dts references.dts path-references.dts \
comments.dts aliases.dts include0.dts incbin.dts ; do
run_dtc_test -I dts -O asm -o oasm_$tree.test.s $tree
asm_to_so_test oasm_$tree
run_dtc_test -I dts -O dtb -o $tree.test.dtb $tree
run_test asm_tree_dump ./oasm_$tree.test.so oasm_$tree.test.dtb
run_wrap_test cmp oasm_$tree.test.dtb $tree.test.dtb
done
# Check -Odts mode preserve all dtb information
for tree in test_tree1.dtb dtc_tree1.test.dtb dtc_escapes.test.dtb \
dtc_references.test.dtb; do