234 lines
6.3 KiB
C
234 lines
6.3 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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#include "u_execmem.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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/**
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* Generate a dispatch function (entrypoint) which jumps through
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* the given slot number (offset) in the current dispatch table.
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* We need assembly language in order to accomplish this.
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*/
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_glapi_proc
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generate_entrypoint(unsigned int functionOffset)
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{
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/* 32 is chosen as something of a magic offset. For x86, the dispatch
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* at offset 32 is the first one where the offset in the
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* "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
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*/
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const GLubyte * const template_func = gl_dispatch_functions_start
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+ (DISPATCH_FUNCTION_SIZE * 32);
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GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE);
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if ( code != NULL ) {
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(void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE);
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fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );
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}
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return (_glapi_proc) code;
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}
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/**
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* This function inserts a new dispatch offset into the assembly language
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* stub that was generated with the preceeding function.
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*/
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void
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fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset)
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{
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GLubyte * const code = (GLubyte *) entrypoint;
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*((unsigned int *)(code + 8)) = 4 * offset;
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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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_glapi_proc
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generate_entrypoint(GLuint functionOffset)
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{
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static const unsigned int template[] = {
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0x07000000, /* sethi %hi(0), %g3 */
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0x8210000f, /* mov %o7, %g1 */
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0x40000000, /* call */
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0x9e100001, /* mov %g1, %o7 */
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};
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extern unsigned int __glapi_sparc_tls_stub;
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unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub;
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unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template));
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if (code) {
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code[0] = template[0] | (functionOffset & 0x3fffff);
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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] |
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(((call_dest - ((unsigned long) &code[2]))
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>> 2) & 0x3fffffff);
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code[3] = template[3];
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__glapi_sparc_icache_flush(&code[2]);
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}
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return (_glapi_proc) code;
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}
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void
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fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
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{
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unsigned int *code = (unsigned int *) entrypoint;
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code[0] &= ~0x3fffff;
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code[0] |= (offset * sizeof(void *)) & 0x3fffff;
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__glapi_sparc_icache_flush(&code[0]);
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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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_glapi_proc
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generate_entrypoint(GLuint functionOffset)
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{
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(void) functionOffset;
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return NULL;
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}
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void
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fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
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{
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/* an unimplemented architecture */
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(void) entrypoint;
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(void) offset;
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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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