Module: Mesa Branch: master Commit: 857ac1e817808f4b6bf985679162d0e3d709e5b5 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=857ac1e817808f4b6bf985679162d0e3d709e5b5
Author: David S. Miller <[email protected]> Date: Thu Feb 26 05:35:15 2009 -0800 mesa: Resurrect SPARC asm code. This rewrites the sparc GLAPI code so that it's PIC friendly and works with all of the TLS/PTHREADS/64-bit/32-bit combinations properly. As a result we can turn SPARC asm back on. Currently it's only enabled on Linux, as that's the only place where I can test this stuff out. For the moment the cliptest SPARC asm routines are disabled as they are non-working. The problem is that they use register %g7 as a temporary which is where the threading libraries store the thread pointer on SPARC. I will fix that code up in a future change as it's a pretty important routine to optimize. Like x86 we do the runtime patch as a pthread once-invoked initializer in init_glapi_relocs(). Unlike x86, however, our GLAPI stubs on SPARC are just two instruction sequences that branch to a trampoline and put the GLAPI offset into a register. The trampoline is what we run-time patch. The stubs thus all look like: glFoo: ba __glapi_sparc_foo_stub sethi GLAPI_OFFSET(glFOO) * PTR_SIZE, %g3 This actually makes generate_entrypoint() a lot simpler on SPARC. For this case in generate_entrypoint() we generate stubs using a 'call' instead of the 'ba' above to make sure it can reach. In order to get a proper tail call going here, in the unpatched case, we do several tricks. To get the current PC, for example, we save the return address register into a temporary, do a call, save the return address register written by the call to another temporary, then restore the original return address register value. This is to avoid having to allocate a stack frame. This is necessary for PIC address formation. This new GLAPI scheme lets us get rid of the ugly SPARC GLAPI hacks in __glXInitialize() and one_time_init(). Signed-off-by: David S. Miller <[email protected]> --- configure.ac | 13 + src/glx/x11/glxext.c | 86 --- src/mesa/glapi/gl_SPARC_asm.py | 228 +++++-- src/mesa/glapi/glapi.c | 131 ++++ src/mesa/glapi/glapi_getproc.c | 78 +-- src/mesa/main/context.c | 3 - src/mesa/sparc/glapi_sparc.S | 1645 +++++++++++++--------------------------- src/mesa/sparc/sparc.c | 38 +- src/mesa/sparc/sparc.h | 1 - 9 files changed, 891 insertions(+), 1332 deletions(-) Diff: http://cgit.freedesktop.org/mesa/mesa/diff/?id=857ac1e817808f4b6bf985679162d0e3d709e5b5 _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
