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glapi: organize arch-specific code by arch (2)

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This commit is contained in:
George Sapountzis 2010-03-11 18:04:02 +02:00
parent 6c8e5151f1
commit 0ed0114de9
1 changed files with 75 additions and 83 deletions
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158
src/mesa/glapi/glapi_entrypoint.c
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@ -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)
@ -302,42 +305,6 @@ generate_entrypoint(GLuint functionOffset)
#endif
}
#else
_glapi_proc
generate_entrypoint(GLuint functionOffset)
{
(void) functionOffset;
return NULL;
}
#endif /* USE_*_ASM */
#if defined(USE_X86_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)
{
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)
@ -349,7 +316,22 @@ fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
__glapi_sparc_icache_flush(&code[0]);
}
#else
#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)
@ -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
}