src/mesa/glapi/gl_x86-64_asm.py

   1 #!/usr/bin/env python
   2
   3 # (C) Copyright IBM Corporation 2005
   4 # All Rights Reserved.
   5 #
   6 # Permission is hereby granted, free of charge, to any person obtaining a
   7 # copy of this software and associated documentation files (the "Software"),
   8 # to deal in the Software without restriction, including without limitation
   9 # on the rights to use, copy, modify, merge, publish, distribute, sub
  10 # license, and/or sell copies of the Software, and to permit persons to whom
  11 # the Software is furnished to do so, subject to the following conditions:
  12 #
  13 # The above copyright notice and this permission notice (including the next
  14 # paragraph) shall be included in all copies or substantial portions of the
  15 # Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  20 # IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  23 # IN THE SOFTWARE.
  24 #
  25 # Authors:
  26 #    Ian Romanick <idr@us.ibm.com>
  27
  28 import license
  29 import gl_XML, glX_XML
  30 import sys, getopt, copy
  31
  32 def should_use_push(registers):
  33         for [reg, offset] in registers:
  34                 if reg[1:4] == "xmm":
  35                         return 0
  36
  37         N = len(registers)
  38         return (N & 1) != 0
  39
  40
  41 def local_size(registers):
  42         # The x86-64 ABI says "the value (%rsp - 8) is always a multiple of
  43         # 16 when control is transfered to the function entry point."  This
  44         # means that the local stack usage must be (16*N)+8 for some value
  45         # of N.  (16*N)+8 = (8*(2N))+8 = 8*(2N+1).  As long as N is odd, we
  46         # meet this requirement.
  47
  48         N = (len(registers) | 1)
  49         return 8*N
  50
  51
  52 def save_all_regs(registers):
  53         adjust_stack = 0
  54         if not should_use_push(registers):
  55                 adjust_stack = local_size(registers)
  56                 print '\tsubq\t$%u, %%rsp' % (adjust_stack)
  57
  58         for [reg, stack_offset] in registers:
  59                 save_reg( reg, stack_offset, adjust_stack )
  60         return
  61
  62
  63 def restore_all_regs(registers):
  64         adjust_stack = 0
  65         if not should_use_push(registers):
  66                 adjust_stack = local_size(registers)
  67
  68         temp = copy.deepcopy(registers)
  69         while len(temp):
  70                 [reg, stack_offset] = temp.pop()
  71                 restore_reg(reg, stack_offset, adjust_stack)
  72
  73         if adjust_stack:
  74                 print '\taddq\t$%u, %%rsp' % (adjust_stack)
  75         return
  76
  77
  78 def save_reg(reg, offset, use_move):
  79         if use_move:
  80                 if offset == 0:
  81                         print '\tmovq\t%s, (%%rsp)' % (reg)
  82                 else:
  83                         print '\tmovq\t%s, %u(%%rsp)' % (reg, offset)
  84         else:
  85                 print '\tpushq\t%s' % (reg)
  86
  87         return
  88
  89
  90 def restore_reg(reg, offset, use_move):
  91         if use_move:
  92                 if offset == 0:
  93                         print '\tmovq\t(%%rsp), %s' % (reg)
  94                 else:
  95                         print '\tmovq\t%u(%%rsp), %s' % (offset, reg)
  96         else:
  97                 print '\tpopq\t%s' % (reg)
  98
  99         return
 100
 101
 102 class PrintGenericStubs(gl_XML.gl_print_base):
 103
 104         def __init__(self):
 105                 gl_XML.gl_print_base.__init__(self)
 106
 107                 self.name = "gl_x86-64_asm.py (from Mesa)"
 108                 self.license = license.bsd_license_template % ("(C) Copyright IBM Corporation 2005", "IBM")
 109                 return
 110
 111
 112         def get_stack_size(self, f):
 113                 size = 0
 114                 for p in f.parameterIterator():
 115                         size += p.get_stack_size()
 116
 117                 return size
 118
 119
 120         def printRealHeader(self):
 121                 print "/* If we build with gcc's -fvisibility=hidden flag, we'll need to change"
 122                 print " * the symbol visibility mode to 'default'."
 123                 print ' */'
 124                 print ''
 125                 print '#include "../x86/assyntax.h"'
 126                 print ''
 127                 print '#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 303'
 128                 print '#  pragma GCC visibility push(default)'
 129                 print '#  define HIDDEN(x) .hidden x'
 130                 print '#else'
 131                 print '#  define HIDDEN(x)'
 132                 print '#endif'
 133                 print ''
 134                 print '# if defined(USE_MGL_NAMESPACE)'
 135                 print '#  define GL_PREFIX(n) GLNAME(CONCAT(mgl,n))'
 136                 print '# else'
 137                 print '#  define GL_PREFIX(n) GLNAME(CONCAT(gl,n))'
 138                 print '# endif'
 139                 print ''
 140                 print '#if defined(PTHREADS) || defined(USE_XTHREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || defined(BEOS_THREADS)'
 141                 print '#  define THREADS'
 142                 print '#endif'
 143                 print ''
 144                 print '#ifdef USE_MGL_NAMESPACE'
 145                 print '#define _glapi_Dispatch _mglapi_Dispatch'
 146                 print '#endif'
 147                 print ''
 148                 print '\t.text'
 149                 print ''
 150                 print '#ifdef GLX_USE_TLS'
 151                 print ''
 152                 print '\t.globl _x86_64_get_get_dispatch; HIDDEN(_x86_64_get_get_dispatch)'
 153                 print '_x86_64_get_get_dispatch:'
 154                 print '\tlea\t_x86_64_get_dispatch(%rip), %rax'
 155                 print '\tret'
 156                 print ''
 157                 print '\t.p2align\t4,,15'
 158                 print '_x86_64_get_dispatch:'
 159                 print '\tmovq\t_glapi_tls_Dispatch@GOTTPOFF(%rip), %rax'
 160                 print '\tmovq\t%fs:(%rax), %rax'
 161                 print '\tret'
 162                 print '\t.size\t_x86_64_get_dispatch, .-_x86_64_get_dispatch'
 163                 print ''
 164                 print '#elif defined(PTHREADS)'
 165                 print ''
 166                 print '\t.extern\t_glapi_Dispatch'
 167                 print '\t.extern\t_gl_DispatchTSD'
 168                 print '\t.extern\tpthread_getspecific'
 169                 print ''
 170                 print '\t.p2align\t4,,15'
 171                 print '_x86_64_get_dispatch:'
 172                 print '\tmovq\t_gl_DispatchTSD(%rip), %rdi'
 173                 print '\tjmp\tpthread_getspecific@PLT'
 174                 print ''
 175                 print '#elif defined(THREADS)'
 176                 print ''
 177                 print '\t.extern\t_glapi_get_dispatch'
 178                 print ''
 179                 print '#endif'
 180                 print ''
 181                 return
 182
 183
 184         def printRealFooter(self):
 185                 print ''
 186                 print '#if defined(GLX_USE_TLS) && defined(__linux__)'
 187                 print ' .section ".note.ABI-tag", "a"'
 188                 print ' .p2align 2'
 189                 print ' .long   1f - 0f   /* name length */'
 190                 print ' .long   3f - 2f   /* data length */'
 191                 print ' .long   1         /* note length */'
 192                 print '0:       .asciz "GNU"      /* vendor name */'
 193                 print '1:       .p2align 2'
 194                 print '2:       .long   0         /* note data: the ABI tag */'
 195                 print ' .long   2,4,20    /* Minimum kernel version w/TLS */'
 196                 print '3:       .p2align 2        /* pad out section */'
 197                 print '#endif /* GLX_USE_TLS */'
 198                 print ''
 199                 print '#if defined (__ELF__) && defined (__linux__)'
 200                 print ' .section .note.GNU-stack,"",%progbits'
 201                 print '#endif'
 202                 return
 203
 204
 205         def printFunction(self, f):
 206
 207                 # The x86-64 ABI divides function parameters into a couple
 208                 # classes.  For the OpenGL interface, the only ones that are
 209                 # relevent are INTEGER and SSE.  Basically, the first 8
 210                 # GLfloat or GLdouble parameters are placed in %xmm0 - %xmm7,
 211                 # the first 6 non-GLfloat / non-GLdouble parameters are placed
 212                 # in registers listed in int_parameters.
 213                 #
 214                 # If more parameters than that are required, they are passed
 215                 # on the stack.  Therefore, we just have to make sure that
 216                 # %esp hasn't changed when we jump to the actual function.
 217                 # Since we're jumping to the function (and not calling it), we
 218                 # have to make sure of that anyway!
 219
 220                 int_parameters = ["%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9"]
 221
 222                 int_class = 0
 223                 sse_class = 0
 224                 stack_offset = 0
 225                 registers = []
 226                 for p in f.parameterIterator():
 227                         type_name = p.get_base_type_string()
 228
 229                         if p.is_pointer() or (type_name != "GLfloat" and type_name != "GLdouble"):
 230                                 if int_class < 6:
 231                                         registers.append( [int_parameters[int_class], stack_offset] )
 232                                         int_class += 1
 233                                         stack_offset += 8
 234                         else:
 235                                 if sse_class < 8:
 236                                         registers.append( ["%%xmm%u" % (sse_class), stack_offset] )
 237                                         sse_class += 1
 238                                         stack_offset += 8
 239
 240                 if ((int_class & 1) == 0) and (sse_class == 0):
 241                         registers.append( ["%rbp", 0] )
 242
 243
 244                 name = f.dispatch_name()
 245
 246                 print '\t.p2align\t4,,15'
 247                 print '\t.globl\tGL_PREFIX(%s)' % (name)
 248                 print '\t.type\tGL_PREFIX(%s), @function' % (name)
 249                 if not f.is_static_entry_point(f.name):
 250                         print '\tHIDDEN(GL_PREFIX(%s))' % (name)
 251                 print 'GL_PREFIX(%s):' % (name)
 252                 print '#if defined(GLX_USE_TLS)'
 253                 print '\tcall\t_x86_64_get_dispatch@PLT'
 254                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 255                 print '\tjmp\t*%r11'
 256                 print '#elif defined(PTHREADS)'
 257
 258                 save_all_regs(registers)
 259                 print '\tcall\t_x86_64_get_dispatch@PLT'
 260                 restore_all_regs(registers)
 261
 262                 if f.offset == 0:
 263                         print '\tmovq\t(%rax), %r11'
 264                 else:
 265                         print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 266
 267                 print '\tjmp\t*%r11'
 268
 269                 print '#else'
 270                 print '\tmovq\t_glapi_Dispatch(%rip), %rax'
 271                 print '\ttestq\t%rax, %rax'
 272                 print '\tje\t1f'
 273                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 274                 print '\tjmp\t*%r11'
 275                 print '1:'
 276
 277                 save_all_regs(registers)
 278                 print '\tcall\t_glapi_get_dispatch'
 279                 restore_all_regs(registers)
 280
 281                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 282                 print '\tjmp\t*%r11'
 283                 print '#endif /* defined(GLX_USE_TLS) */'
 284
 285                 print '\t.size\tGL_PREFIX(%s), .-GL_PREFIX(%s)' % (name, name)
 286                 print ''
 287                 return
 288
 289
 290         def printBody(self, api):
 291                 for f in api.functionIterateByOffset():
 292                         self.printFunction(f)
 293
 294
 295                 for f in api.functionIterateByOffset():
 296                         dispatch = f.dispatch_name()
 297                         for n in f.entry_points:
 298                                 if n != f.name:
 299                                         if f.is_static_entry_point(n):
 300                                                 text = '\t.globl GL_PREFIX(%s) ; .set GL_PREFIX(%s), GL_PREFIX(%s)' % (n, n, dispatch)
 301
 302                                                 if f.has_different_protocol(n):
 303                                                         print '#ifndef GLX_INDIRECT_RENDERING'
 304                                                         print text
 305                                                         print '#endif'
 306                                                 else:
 307                                                         print text
 308
 309                 return
 310
 311 def show_usage():
 312         print "Usage: %s [-f input_file_name] [-m output_mode]" % sys.argv[0]
 313         sys.exit(1)
 314
 315 if __name__ == '__main__':
 316         file_name = "gl_API.xml"
 317         mode = "generic"
 318
 319         try:
 320                 (args, trail) = getopt.getopt(sys.argv[1:], "m:f:")
 321         except Exception,e:
 322                 show_usage()
 323
 324         for (arg,val) in args:
 325                 if arg == '-m':
 326                         mode = val
 327                 elif arg == "-f":
 328                         file_name = val
 329
 330         if mode == "generic":
 331                 printer = PrintGenericStubs()
 332         else:
 333                 print "ERROR: Invalid mode \"%s\" specified." % mode
 334                 show_usage()
 335
 336         api = gl_XML.parse_GL_API(file_name, glX_XML.glx_item_factory())
 337         printer.Print(api)