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authorDavid S. Miller <davem@davemloft.net>2009-02-26 05:35:15 -0800
committerBrian Paul <brianp@vmware.com>2009-02-26 18:29:48 -0700
commit857ac1e817808f4b6bf985679162d0e3d709e5b5 (patch)
treed023570b1faaa91088d05111aaebe98e7c424d27 /src/glx/x11
parentb12dc74f86c611483465c08504dc8a564f927b15 (diff)
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 <davem@davemloft.net>
Diffstat (limited to 'src/glx/x11')
-rw-r--r--src/glx/x11/glxext.c86
1 files changed, 0 insertions, 86 deletions
diff --git a/src/glx/x11/glxext.c b/src/glx/x11/glxext.c
index be6edf9b19..b296b7c651 100644
--- a/src/glx/x11/glxext.c
+++ b/src/glx/x11/glxext.c
@@ -56,19 +56,6 @@
void __glXDumpDrawBuffer(__GLXcontext * ctx);
#endif
-#ifdef USE_SPARC_ASM
-static void _glx_mesa_init_sparc_glapi_relocs(void);
-static int _mesa_sparc_needs_init = 1;
-#define INIT_MESA_SPARC do { \
- if (_mesa_sparc_needs_init) { \
- _glx_mesa_init_sparc_glapi_relocs(); \
- _mesa_sparc_needs_init = 0; \
- } \
- } while(0)
-#else
-#define INIT_MESA_SPARC do { } while(0)
-#endif
-
/*
** You can set this cell to 1 to force the gl drawing stuff to be
** one command per packet
@@ -670,7 +657,6 @@ __glXInitialize(Display * dpy)
}
#endif
- INIT_MESA_SPARC;
/* The one and only long long lock */
__glXLock();
@@ -785,7 +771,6 @@ __glXSetupForCommand(Display * dpy)
if (gc->currentDpy == dpy) {
/* Use opcode from gc because its right */
- INIT_MESA_SPARC;
return gc->majorOpcode;
}
else {
@@ -979,74 +964,3 @@ __glXDumpDrawBuffer(__GLXcontext * ctx)
}
}
#endif
-
-#ifdef USE_SPARC_ASM
-/*
- * This is where our dispatch table's bounds are.
- * And the static mesa_init is taken directly from
- * Mesa's 'sparc.c' initializer.
- *
- * We need something like this here, because this version
- * of openGL/glx never initializes a Mesa context, and so
- * the address of the dispatch table pointer never gets stuffed
- * into the dispatch jump table otherwise.
- *
- * It matters only on SPARC, and only if you are using assembler
- * code instead of C-code indirect dispatch.
- *
- * -- FEM, 04.xii.03
- */
-extern unsigned int _mesa_sparc_glapi_begin;
-extern unsigned int _mesa_sparc_glapi_end;
-extern void __glapi_sparc_icache_flush(unsigned int *);
-
-static void
-_glx_mesa_init_sparc_glapi_relocs(void)
-{
- unsigned int *insn_ptr, *end_ptr;
- unsigned long disp_addr;
-
- insn_ptr = &_mesa_sparc_glapi_begin;
- end_ptr = &_mesa_sparc_glapi_end;
- disp_addr = (unsigned long) &_glapi_Dispatch;
-
- /*
- * Verbatim from Mesa sparc.c. It's needed because there doesn't
- * seem to be a better way to do this:
- *
- * UNCONDITIONAL_JUMP ( (*_glapi_Dispatch) + entry_offset )
- *
- * This code is patching in the ADDRESS of the pointer to the
- * dispatch table. Hence, it must be called exactly once, because
- * that address is not going to change.
- *
- * What it points to can change, but Mesa (and hence, we) assume
- * that there is only one pointer.
- *
- */
- while (insn_ptr < end_ptr) {
-#if ( defined(__sparc_v9__) && ( !defined(__linux__) || defined(__linux_64__) ) )
-/*
- This code patches for 64-bit addresses. This had better
- not happen for Sparc/Linux, no matter what architecture we
- are building for. So, don't do this.
-
- The 'defined(__linux_64__)' is used here as a placeholder for
- when we do do 64-bit usermode on sparc linux.
- */
- insn_ptr[0] |= (disp_addr >> (32 + 10));
- insn_ptr[1] |= ((disp_addr & 0xffffffff) >> 10);
- __glapi_sparc_icache_flush(&insn_ptr[0]);
- insn_ptr[2] |= ((disp_addr >> 32) & ((1 << 10) - 1));
- insn_ptr[3] |= (disp_addr & ((1 << 10) - 1));
- __glapi_sparc_icache_flush(&insn_ptr[2]);
- insn_ptr += 11;
-#else
- insn_ptr[0] |= (disp_addr >> 10);
- insn_ptr[1] |= (disp_addr & ((1 << 10) - 1));
- __glapi_sparc_icache_flush(&insn_ptr[0]);
- insn_ptr += 5;
-#endif
- }
-}
-#endif /* sparc ASM in use */