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]>

1 files changed, 175 insertions, 53 deletions

diff --git a/src/mesa/glapi/gl_SPARC_asm.py b/src/mesa/glapi/gl_SPARC_asm.py
index 178c00a227f..33e752df38c 100644
--- a/src/mesa/glapi/gl_SPARC_asm.py
+++ b/src/mesa/glapi/gl_SPARC_asm.py
@@ -39,80 +39,202 @@ class PrintGenericStubs(gl_XML.gl_print_base):
 
 
 	def printRealHeader(self):
-		print '#include "glapioffsets.h"'
+		print '#include "glapi/glapioffsets.h"'
 		print ''
 		print '#ifdef __arch64__'
-		print '#  define GL_STUB(fn,off)\t\t\t\t\\'
-		print 'fn:\t\t\t\t\t\\'
-		print '\tsethi\t%hi(0xDEADBEEF), %g4 ;\t\t\t\\'
-		print '\tsethi\t%hi(0xDEADBEEF), %g1 ;\t\t\t\\'
-		print '\tor\t%g4, %lo(0xDEADBEEF), %g4 ;\t\t\\'
-		print '\tor\t%g1, %lo(0xDEADBEEF), %g1 ;\t\t\\'
-		print '\tsllx\t%g4, 32, %g4 ;\t\t\t\t\\'
-		print '\tldx\t[%g1 + %g4], %g1 ;\t\t\t\\'
-		print '\tsethi\t%hi(8 * off), %g4 ;\t\t\t\\'
-		print '\tor\t%g4, %lo(8 * off), %g4 ;\t\t\\'
-		print '\tldx\t[%g1 + %g4], %g5 ;\t\t\t\\'
-		print '\tjmpl\t%g5, %g0 ;\t\t\t\t\\'
-		print '\tnop'
+		print '#define GL_OFF(N)\t((N) * 8)'
+		print '#define GL_LL\t\tldx'
+		print '#define GL_TIE_LD(SYM)\t%tie_ldx(SYM)'
+		print '#define GL_STACK_SIZE\t128'
 		print '#else'
-		print '#  define GL_STUB(fn,off)\t\t\t\t\\'
-		print 'fn:\t\t\t\t\t\\'
-		print '\tsethi\t%hi(0xDEADBEEF), %g1 ;\t\t\t\\'
-		print '\tld\t[%g1 + %lo(0xDEADBEEF)], %g1 ;\t\t\\'
-		print '\tld\t[%g1 + (4 * off)], %g5 ;\t\t\\'
-		print '\tjmpl\t%g5, %g0 ;\t\t\t\t\\'
-		print '\tnop'
+		print '#define GL_OFF(N)\t((N) * 4)'
+		print '#define GL_LL\t\tld'
+		print '#define GL_TIE_LD(SYM)\t%tie_ld(SYM)'
+		print '#define GL_STACK_SIZE\t64'
 		print '#endif'
 		print ''
-		print '#define GL_STUB_ALIAS(fn,alias) fn = alias'
+		print '#define GLOBL_FN(x) .globl x ; .type x, @function'
+		print '#define HIDDEN(x) .hidden x'
 		print ''
-		print '.text'
-		print '.align 32'
-		print '\t\t.globl __glapi_sparc_icache_flush ; .type __glapi_sparc_icache_flush,#function'
+		print '\t.register %g2, #scratch'
+		print '\t.register %g3, #scratch'
+		print ''
+		print '\t.text'
+		print ''
+		print '\tGLOBL_FN(__glapi_sparc_icache_flush)'
+		print '\tHIDDEN(__glapi_sparc_icache_flush)'
+		print '\t.type\t__glapi_sparc_icache_flush, @function'
 		print '__glapi_sparc_icache_flush: /* %o0 = insn_addr */'
 		print '\tflush\t%o0'
 		print '\tretl'
-		print '\tnop'
+		print '\t nop'
+		print ''
+		print '\t.align\t32'
+		print ''
+		print '\t.type\t__glapi_sparc_get_pc, @function'
+		print '__glapi_sparc_get_pc:'
+		print '\tretl'
+		print '\t add\t%o7, %g2, %g2'
+		print '\t.size\t__glapi_sparc_get_pc, .-__glapi_sparc_get_pc'
+		print ''
+		print '#ifdef GLX_USE_TLS'
+		print ''
+		print '\tGLOBL_FN(__glapi_sparc_get_dispatch)'
+		print '\tHIDDEN(__glapi_sparc_get_dispatch)'
+		print '__glapi_sparc_get_dispatch:'
+		print '\tmov\t%o7, %g1'
+		print '\tsethi\t%hi(_GLOBAL_OFFSET_TABLE_-4), %g2'
+		print '\tcall\t__glapi_sparc_get_pc'
+		print '\tadd\t%g2, %lo(_GLOBAL_OFFSET_TABLE_+4), %g2'
+		print '\tmov\t%g1, %o7'
+		print '\tsethi\t%tie_hi22(_glapi_tls_Dispatch), %g1'
+		print '\tadd\t%g1, %tie_lo10(_glapi_tls_Dispatch), %g1'
+		print '\tGL_LL\t[%g2 + %g1], %g2, GL_TIE_LD(_glapi_tls_Dispatch)'
+		print '\tretl'
+		print '\t mov\t%g2, %o0'
+		print ''
+		print '\t.data'
+		print '\t.align\t32'
+		print ''
+		print '\t/* --> sethi %hi(_glapi_tls_Dispatch), %g1 */'
+		print '\t/* --> or %g1, %lo(_glapi_tls_Dispatch), %g1 */'
+		print '\tGLOBL_FN(__glapi_sparc_tls_stub)'
+		print '\tHIDDEN(__glapi_sparc_tls_stub)'
+		print '__glapi_sparc_tls_stub: /* Call offset in %g3 */'
+		print '\tmov\t%o7, %g1'
+		print '\tsethi\t%hi(_GLOBAL_OFFSET_TABLE_-4), %g2'
+		print '\tcall\t__glapi_sparc_get_pc'
+		print '\tadd\t%g2, %lo(_GLOBAL_OFFSET_TABLE_+4), %g2'
+		print '\tmov\t%g1, %o7'
+		print '\tsrl\t%g3, 10, %g3'
+		print '\tsethi\t%tie_hi22(_glapi_tls_Dispatch), %g1'
+		print '\tadd\t%g1, %tie_lo10(_glapi_tls_Dispatch), %g1'
+		print '\tGL_LL\t[%g2 + %g1], %g2, GL_TIE_LD(_glapi_tls_Dispatch)'
+		print '\tGL_LL\t[%g7+%g2], %g1'
+		print '\tGL_LL\t[%g1 + %g3], %g1'
+		print '\tjmp\t%g1'
+		print '\t nop'
+		print '\t.size\t__glapi_sparc_tls_stub, .-__glapi_sparc_tls_stub'
+		print ''
+		print '#define GL_STUB(fn, off)\t\t\t\t\\'
+		print '\tGLOBL_FN(fn);\t\t\t\t\t\\'
+		print 'fn:\tba\t__glapi_sparc_tls_stub;\t\t\t\\'
+		print '\t sethi\tGL_OFF(off), %g3;\t\t\t\\'
+		print '\t.size\tfn,.-fn;'
+		print ''
+		print '#elif defined(PTHREADS)'
+		print ''
+		print '\t/* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */'
+		print '\t/* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */'
+		print '\t/* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */'
+		print '\t/* 64-bit 0x0c --> sllx %g1, 32, %g1 */'
+		print '\t/* 64-bit 0x10 --> add %g1, %g2, %g1 */'
+		print '\t/* 64-bit 0x14 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */'
+		print ''
+		print '\t/* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */'
+		print '\t/* 32-bit 0x04 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */'
+		print ''
+		print '\t.data'
+		print '\t.align\t32'
+		print ''
+		print '\tGLOBL_FN(__glapi_sparc_pthread_stub)'
+		print '\tHIDDEN(__glapi_sparc_pthread_stub)'
+		print '__glapi_sparc_pthread_stub: /* Call offset in %g3 */'
+		print '\tmov\t%o7, %g1'
+		print '\tsethi\t%hi(_GLOBAL_OFFSET_TABLE_-4), %g2'
+		print '\tcall\t__glapi_sparc_get_pc'
+		print '\t add\t%g2, %lo(_GLOBAL_OFFSET_TABLE_+4), %g2'
+		print '\tmov\t%g1, %o7'
+		print '\tsethi\t%hi(_glapi_Dispatch), %g1'
+		print '\tor\t%g1, %lo(_glapi_Dispatch), %g1'
+		print '\tsrl\t%g3, 10, %g3'
+		print '\tGL_LL\t[%g2+%g1], %g2'
+		print '\tGL_LL\t[%g2], %g1'
+		print '\tcmp\t%g1, 0'
+		print '\tbe\t2f'
+		print '\t nop'
+		print '1:\tGL_LL\t[%g1 + %g3], %g1'
+		print '\tjmp\t%g1'
+		print '\t nop'
+		print '2:\tsave\t%sp, GL_STACK_SIZE, %sp'
+		print '\tmov\t%g3, %l0'
+		print '\tcall\t_glapi_get_dispatch'
+		print '\t nop'
+		print '\tmov\t%o0, %g1'
+		print '\tmov\t%l0, %g3'
+		print '\tba\t1b'
+		print '\t restore %g0, %g0, %g0'
+		print '\t.size\t__glapi_sparc_pthread_stub, .-__glapi_sparc_pthread_stub'
+		print ''
+		print '#define GL_STUB(fn, off)\t\t\t\\'
+		print '\tGLOBL_FN(fn);\t\t\t\t\\'
+		print 'fn:\tba\t__glapi_sparc_pthread_stub;\t\\'
+		print '\t sethi\tGL_OFF(off), %g3;\t\t\\'
+		print '\t.size\tfn,.-fn;'
+		print ''
+		print '#else /* Non-threaded version. */'
 		print ''
-		print '.data'
-		print '.align 64'
+		print '\t.type	__glapi_sparc_nothread_stub, @function'
+		print '__glapi_sparc_nothread_stub: /* Call offset in %g3 */'
+		print '\tmov\t%o7, %g1'
+		print '\tsethi\t%hi(_GLOBAL_OFFSET_TABLE_-4), %g2'
+		print '\tcall\t__glapi_sparc_get_pc'
+		print '\t add\t%g2, %lo(_GLOBAL_OFFSET_TABLE_+4), %g2'
+		print '\tmov\t%g1, %o7'
+		print '\tsrl\t%g3, 10, %g3'
+		print '\tsethi\t%hi(_glapi_Dispatch), %g1'
+		print '\tor\t%g1, %lo(_glapi_Dispatch), %g1'
+		print '\tGL_LL\t[%g2+%g1], %g2'
+		print '\tGL_LL\t[%g2], %g1'
+		print '\tGL_LL\t[%g1 + %g3], %g1'
+		print '\tjmp\t%g1'
+		print '\t nop'
+		print '\t.size\t__glapi_sparc_nothread_stub, .-__glapi_sparc_nothread_stub'
+		print ''
+		print '#define GL_STUB(fn, off)\t\t\t\\'
+		print '\tGLOBL_FN(fn);\t\t\t\t\\'
+		print 'fn:\tba\t__glapi_sparc_nothread_stub;\t\\'
+		print '\t sethi\tGL_OFF(off), %g3;\t\t\\'
+		print '\t.size\tfn,.-fn;'
+		print ''
+		print '#endif'
+		print ''
+		print '#define GL_STUB_ALIAS(fn, alias)		\\'
+		print '	.globl	fn;				\\'
+		print '	.set	fn, alias'
+		print ''
+		print '\t.text'
+		print '\t.align\t32'
+		print ''
+		print '\t.globl\tgl_dispatch_functions_start'
+		print '\tHIDDEN(gl_dispatch_functions_start)'
+		print 'gl_dispatch_functions_start:'
 		print ''
 		return
 
+	def printRealFooter(self):
+		print ''
+		print '\t.globl\tgl_dispatch_functions_end'
+		print '\tHIDDEN(gl_dispatch_functions_end)'
+		print 'gl_dispatch_functions_end:'
+		return
 
 	def printBody(self, api):
 		for f in api.functionIterateByOffset():
-			if f.is_static_entry_point(f.name):
-				name = f.name
-			else:
-				name = "_dispatch_stub_%u" % (f.offset)
+			name = f.dispatch_name()
 
-			print '\t\t.globl gl%s ; .type gl%s,#function' % (name, name)
+			print '\tGL_STUB(gl%s, _gloffset_%s)' % (name, f.name)
 
-		print '\t\t.globl _mesa_sparc_glapi_begin ; .type _mesa_sparc_glapi_begin,#function'
-		print '_mesa_sparc_glapi_begin:'
-		print ''
+			if not f.is_static_entry_point(f.name):
+				print '\tHIDDEN(gl%s)' % (name)
 
 		for f in api.functionIterateByOffset():
-			if f.is_static_entry_point(f.name):
-				name = f.name
-			else:
-				name = "_dispatch_stub_%u" % (f.offset)
-
-			print '\tGL_STUB(gl%s, _gloffset_%s)' % (name, name)
+			name = f.dispatch_name()
 
-		print ''
-		print '\t\t.globl _mesa_sparc_glapi_end ; .type _mesa_sparc_glapi_end,#function'
-		print '_mesa_sparc_glapi_end:'
-		print ''
-
-
-		for f in api.functionIterateByOffset():
-			for n in f.entry_points:
-				if n != f.name:
-					if f.is_static_entry_point(n):
-						text = '\t.globl gl%s ; .type gl%s,#function ; gl%s = gl%s' % (n, n, n, f.name)
+			if f.is_static_entry_point(f.name):
+				for n in f.entry_points:
+					if n != f.name:
+						text = '\tGL_STUB_ALIAS(gl%s, gl%s)' % (n, f.name)
 
 						if f.has_different_protocol(n):
 							print '#ifndef GLX_INDIRECT_RENDERING'