diff options
| -rw-r--r-- | src/mesa/glapi/glapi_entrypoint.c | 154 |
1 files changed, 73 insertions, 81 deletions
diff --git a/src/mesa/glapi/glapi_entrypoint.c b/src/mesa/glapi/glapi_entrypoint.c index 7fffd2986fa..9bc38783541 100644 --- a/src/mesa/glapi/glapi_entrypoint.c +++ b/src/mesa/glapi/glapi_entrypoint.c @@ -90,6 +90,55 @@ init_glapi_relocs( void ) #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(GLuint 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 *) malloc(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, GLuint offset) +{ + GLubyte * const code = (GLubyte *) entrypoint; + +#if DISPATCH_FUNCTION_SIZE == 32 + *((unsigned int *)(code + 11)) = 4 * offset; + *((unsigned int *)(code + 22)) = 4 * offset; +#elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS ) + *((unsigned int *)(code + 8)) = 4 * offset; +#elif DISPATCH_FUNCTION_SIZE == 16 + *((unsigned int *)(code + 7)) = 4 * offset; +#else +# error Invalid DISPATCH_FUNCTION_SIZE! +#endif +} + + #elif defined(USE_SPARC_ASM) extern void __glapi_sparc_icache_flush(unsigned int *); @@ -223,52 +272,6 @@ init_glapi_relocs( void ) #endif } -#else - -static void -init_glapi_relocs( void ) { } - -#endif /* USE_*_ASM */ - - -void -init_glapi_relocs_once( void ) -{ -#if defined(PTHREADS) || defined(GLX_USE_TLS) - static pthread_once_t once_control = PTHREAD_ONCE_INIT; - pthread_once( & once_control, init_glapi_relocs ); -#endif -} - - -#if defined(USE_X86_ASM) - -/** - * 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(GLuint 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 *) malloc(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; -} - -#elif defined(USE_SPARC_ASM) _glapi_proc generate_entrypoint(GLuint functionOffset) @@ -302,54 +305,33 @@ generate_entrypoint(GLuint functionOffset) #endif } -#else -_glapi_proc -generate_entrypoint(GLuint functionOffset) +void +fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) { - (void) functionOffset; - return NULL; -} + unsigned int *code = (unsigned int *) entrypoint; -#endif /* USE_*_ASM */ + code[0] &= ~0x3fffff; + code[0] |= (offset * sizeof(void *)) & 0x3fffff; + __glapi_sparc_icache_flush(&code[0]); +} -#if defined(USE_X86_ASM) +#else /* USE_*_ASM */ -/** - * 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, GLuint offset) +static void +init_glapi_relocs( void ) { - GLubyte * const code = (GLubyte *) entrypoint; - -#if DISPATCH_FUNCTION_SIZE == 32 - *((unsigned int *)(code + 11)) = 4 * offset; - *((unsigned int *)(code + 22)) = 4 * offset; -#elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS ) - *((unsigned int *)(code + 8)) = 4 * offset; -#elif DISPATCH_FUNCTION_SIZE == 16 - *((unsigned int *)(code + 7)) = 4 * offset; -#else -# error Invalid DISPATCH_FUNCTION_SIZE! -#endif } -#elif defined(USE_SPARC_ASM) -void -fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) +_glapi_proc +generate_entrypoint(GLuint functionOffset) { - unsigned int *code = (unsigned int *) entrypoint; - - code[0] &= ~0x3fffff; - code[0] |= (offset * sizeof(void *)) & 0x3fffff; - __glapi_sparc_icache_flush(&code[0]); + (void) functionOffset; + return NULL; } -#else void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) @@ -360,3 +342,13 @@ fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) } #endif /* USE_*_ASM */ + + +void +init_glapi_relocs_once( void ) +{ +#if defined(PTHREADS) || defined(GLX_USE_TLS) + static pthread_once_t once_control = PTHREAD_ONCE_INIT; + pthread_once( & once_control, init_glapi_relocs ); +#endif +} |