| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| /** |
| * \file glapi_entrypoint.c |
| * |
| * Arch-specific code for manipulating GL API entrypoints (dispatch stubs). |
| */ |
| |
| |
| #include <string.h> |
| |
| #include "c11/threads.h" |
| #include "glapi/glapi_priv.h" |
| #include "u_execmem.h" |
| |
| |
| #ifdef USE_X86_ASM |
| |
| extern GLubyte gl_dispatch_functions_start[]; |
| extern GLubyte gl_dispatch_functions_end[]; |
| |
| #endif /* USE_X86_ASM */ |
| |
| |
| #if defined(DISPATCH_FUNCTION_SIZE) |
| |
| _glapi_proc |
| get_entrypoint_address(unsigned int functionOffset) |
| { |
| return (_glapi_proc) (gl_dispatch_functions_start |
| + (DISPATCH_FUNCTION_SIZE * functionOffset)); |
| } |
| |
| #endif |
| |
| |
| #if defined(USE_X86_ASM) |
| |
| /** |
| * Perform platform-specific GL API entry-point fixups. |
| */ |
| static void |
| init_glapi_relocs( void ) |
| { |
| #if !defined(GLX_X86_READONLY_TEXT) |
| extern unsigned long _x86_get_dispatch(void); |
| char run_time_patch[] = { |
| 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */ |
| }; |
| GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */ |
| const GLubyte * const get_disp = (const GLubyte *) run_time_patch; |
| GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start; |
| |
| *offset = _x86_get_dispatch(); |
| while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) { |
| (void) memcpy( curr_func, get_disp, sizeof(run_time_patch)); |
| curr_func += DISPATCH_FUNCTION_SIZE; |
| } |
| #endif |
| } |
| |
| |
| /** |
| * Generate a dispatch function (entrypoint) which jumps through |
| * the given slot number (offset) in the current dispatch table. |
| * We need assembly language in order to accomplish this. |
| */ |
| _glapi_proc |
| generate_entrypoint(unsigned int functionOffset) |
| { |
| /* 32 is chosen as something of a magic offset. For x86, the dispatch |
| * at offset 32 is the first one where the offset in the |
| * "jmp OFFSET*4(%eax)" can't be encoded in a single byte. |
| */ |
| const GLubyte * const template_func = gl_dispatch_functions_start |
| + (DISPATCH_FUNCTION_SIZE * 32); |
| GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE); |
| |
| |
| if ( code != NULL ) { |
| (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE); |
| fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset ); |
| } |
| |
| return (_glapi_proc) code; |
| } |
| |
| |
| /** |
| * This function inserts a new dispatch offset into the assembly language |
| * stub that was generated with the preceeding function. |
| */ |
| void |
| fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset) |
| { |
| GLubyte * const code = (GLubyte *) entrypoint; |
| |
| *((unsigned int *)(code + 8)) = 4 * offset; |
| } |
| |
| |
| #elif defined(USE_SPARC_ASM) |
| |
| extern void __glapi_sparc_icache_flush(unsigned int *); |
| |
| static void |
| init_glapi_relocs( void ) |
| { |
| static const unsigned int template[] = { |
| 0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */ |
| 0x8730e00a, /* srl %g3, 10, %g3 */ |
| 0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */ |
| #ifdef __arch64__ |
| 0xc259c002, /* ldx [%g7 + %g2], %g1 */ |
| 0xc2584003, /* ldx [%g1 + %g3], %g1 */ |
| #else |
| 0xc201c002, /* ld [%g7 + %g2], %g1 */ |
| 0xc2004003, /* ld [%g1 + %g3], %g1 */ |
| #endif |
| 0x81c04000, /* jmp %g1 */ |
| 0x01000000, /* nop */ |
| }; |
| extern unsigned int __glapi_sparc_tls_stub; |
| extern unsigned long __glapi_sparc_get_dispatch(void); |
| unsigned int *code = &__glapi_sparc_tls_stub; |
| unsigned long dispatch = __glapi_sparc_get_dispatch(); |
| |
| code[0] = template[0] | (dispatch >> 10); |
| code[1] = template[1]; |
| __glapi_sparc_icache_flush(&code[0]); |
| code[2] = template[2] | (dispatch & 0x3ff); |
| code[3] = template[3]; |
| __glapi_sparc_icache_flush(&code[2]); |
| code[4] = template[4]; |
| code[5] = template[5]; |
| __glapi_sparc_icache_flush(&code[4]); |
| code[6] = template[6]; |
| __glapi_sparc_icache_flush(&code[6]); |
| } |
| |
| |
| _glapi_proc |
| generate_entrypoint(GLuint functionOffset) |
| { |
| static const unsigned int template[] = { |
| 0x07000000, /* sethi %hi(0), %g3 */ |
| 0x8210000f, /* mov %o7, %g1 */ |
| 0x40000000, /* call */ |
| 0x9e100001, /* mov %g1, %o7 */ |
| }; |
| extern unsigned int __glapi_sparc_tls_stub; |
| unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub; |
| unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template)); |
| if (code) { |
| code[0] = template[0] | (functionOffset & 0x3fffff); |
| code[1] = template[1]; |
| __glapi_sparc_icache_flush(&code[0]); |
| code[2] = template[2] | |
| (((call_dest - ((unsigned long) &code[2])) |
| >> 2) & 0x3fffffff); |
| code[3] = template[3]; |
| __glapi_sparc_icache_flush(&code[2]); |
| } |
| return (_glapi_proc) code; |
| } |
| |
| |
| void |
| fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) |
| { |
| unsigned int *code = (unsigned int *) entrypoint; |
| |
| code[0] &= ~0x3fffff; |
| code[0] |= (offset * sizeof(void *)) & 0x3fffff; |
| __glapi_sparc_icache_flush(&code[0]); |
| } |
| |
| |
| #else /* USE_*_ASM */ |
| |
| static void |
| init_glapi_relocs( void ) |
| { |
| } |
| |
| |
| _glapi_proc |
| generate_entrypoint(GLuint functionOffset) |
| { |
| (void) functionOffset; |
| return NULL; |
| } |
| |
| |
| void |
| fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) |
| { |
| /* an unimplemented architecture */ |
| (void) entrypoint; |
| (void) offset; |
| } |
| |
| #endif /* USE_*_ASM */ |
| |
| |
| void |
| init_glapi_relocs_once( void ) |
| { |
| static once_flag flag = ONCE_FLAG_INIT; |
| call_once(&flag, init_glapi_relocs); |
| } |