Prior to this patch sizeof(linear_header) was 20 bytes in a
non-debug build on 32-bit platforms. We do some pointer arithmetic to
calculate the next available location with
ptr = (linear_size_chunk *)((char *)&latest[1] + latest->offset);
in linear_alloc_child(). The &latest[1] adds 20 bytes, so an allocation
would only be 4-byte aligned.
On 32-bit SPARC a 'sttw' instruction (which stores a consecutive pair of
4-byte registers to memory) requires an 8-byte aligned address. Such an
instruction is used to store to an 8-byte integer type, like intmax_t
which is used in glcpp's expression_value_t struct.
As a result of the 4-byte alignment returned by linear_alloc_child() we
would generate a SIGBUS (unaligned exception) on SPARC.
According to the GNU libc manual malloc() always returns memory that has
at least an alignment of 8-bytes [1]. I think our allocator should do
the same.
So, simple fix with two parts:
(1) Increase SUBALLOC_ALIGNMENT to 8 unconditionally.
(2) Mark linear_header with an aligned attribute, which will cause
its sizeof to be rounded up to that alignment. (We already do
this for ralloc_header)
With this done, all Mesa's unit tests now pass on SPARC.
[1] https://www.gnu.org/software/libc/manual/html_node/Aligned-Memory-Blocks.html
Fixes: 47e1758692 ("glcpp: use the linear allocator for most objects")
Bug: https://bugs.gentoo.org/636326
Reviewed-by: Eric Anholt <eric@anholt.net>
Matt Turner
efb1ccadca