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https://gitlab.freedesktop.org/mesa/mesa.git
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398a8d43dc
Since Mesa drivers are now version-locked to the loader, that means that we never need to support a newer hardware driver than the loader, and thus don't need to generate dynamic dispatch stubs. This is great news, given that we don't test those paths, and it involved delightful features like arrays of hex for code to be pasted into executable memory. More code removal will follow, this is the first cut of "don't generate, and DCE generation code". Fixes: #9158 Acked-by: Marek Olšák <marek.olsak@amd.com> Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Adam Jackson <ajax@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23451>
138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file glapi_entrypoint.c
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*
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* Arch-specific code for manipulating GL API entrypoints (dispatch stubs).
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*/
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#include <string.h>
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#include "c11/threads.h"
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#include "glapi/glapi_priv.h"
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#ifdef USE_X86_ASM
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extern GLubyte gl_dispatch_functions_start[];
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extern GLubyte gl_dispatch_functions_end[];
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#endif /* USE_X86_ASM */
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#if defined(DISPATCH_FUNCTION_SIZE)
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_glapi_proc
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get_entrypoint_address(unsigned int functionOffset)
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{
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return (_glapi_proc) (gl_dispatch_functions_start
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+ (DISPATCH_FUNCTION_SIZE * functionOffset));
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}
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#endif
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#if defined(USE_X86_ASM)
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/**
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* Perform platform-specific GL API entry-point fixups.
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*/
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static void
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init_glapi_relocs( void )
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{
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#if !defined(GLX_X86_READONLY_TEXT)
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extern unsigned long _x86_get_dispatch(void);
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char run_time_patch[] = {
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0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
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};
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GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
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const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
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GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
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*offset = _x86_get_dispatch();
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while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
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(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
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curr_func += DISPATCH_FUNCTION_SIZE;
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}
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#endif
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}
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#elif defined(USE_SPARC_ASM)
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extern void __glapi_sparc_icache_flush(unsigned int *);
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static void
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init_glapi_relocs( void )
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{
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static const unsigned int template[] = {
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0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */
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0x8730e00a, /* srl %g3, 10, %g3 */
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0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */
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#ifdef __arch64__
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0xc259c002, /* ldx [%g7 + %g2], %g1 */
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0xc2584003, /* ldx [%g1 + %g3], %g1 */
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#else
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0xc201c002, /* ld [%g7 + %g2], %g1 */
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0xc2004003, /* ld [%g1 + %g3], %g1 */
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#endif
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0x81c04000, /* jmp %g1 */
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0x01000000, /* nop */
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};
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extern unsigned int __glapi_sparc_tls_stub;
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extern unsigned long __glapi_sparc_get_dispatch(void);
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unsigned int *code = &__glapi_sparc_tls_stub;
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unsigned long dispatch = __glapi_sparc_get_dispatch();
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code[0] = template[0] | (dispatch >> 10);
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code[1] = template[1];
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__glapi_sparc_icache_flush(&code[0]);
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code[2] = template[2] | (dispatch & 0x3ff);
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code[3] = template[3];
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__glapi_sparc_icache_flush(&code[2]);
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code[4] = template[4];
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code[5] = template[5];
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__glapi_sparc_icache_flush(&code[4]);
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code[6] = template[6];
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__glapi_sparc_icache_flush(&code[6]);
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}
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#else /* USE_*_ASM */
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static void
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init_glapi_relocs( void )
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{
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}
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#endif /* USE_*_ASM */
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void
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init_glapi_relocs_once( void )
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{
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static once_flag flag = ONCE_FLAG_INIT;
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call_once(&flag, init_glapi_relocs);
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}
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