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 gl_XML, license
  29 import sys, getopt, copy
  30
  31 def should_use_push(registers):
  32         for [reg, offset] in registers:
  33                 if reg[1:4] == "xmm":
  34                         return 0
  35
  36         N = len(registers)
  37         return (N & 1) != 0
  38
  39
  40 def local_size(registers):
  41         # The x86-64 ABI says "the value (%rsp - 8) is always a multiple of
  42         # 16 when control is transfered to the function entry point."  This
  43         # means that the local stack usage must be (16*N)+8 for some value
  44         # of N.  (16*N)+8 = (8*(2N))+8 = 8*(2N+1).  As long as N is odd, we
  45         # meet this requirement.
  46
  47         N = (len(registers) | 1)
  48         return 8*N
  49
  50
  51 def save_all_regs(registers):
  52         adjust_stack = 0
  53         if not should_use_push(registers):
  54                 adjust_stack = local_size(registers)
  55                 print '\tsubq\t$%u, %%rsp' % (adjust_stack)
  56
  57         for [reg, stack_offset] in registers:
  58                 save_reg( reg, stack_offset, adjust_stack )
  59         return
  60
  61
  62 def restore_all_regs(registers):
  63         adjust_stack = 0
  64         if not should_use_push(registers):
  65                 adjust_stack = local_size(registers)
  66
  67         temp = copy.deepcopy(registers)
  68         while len(temp):
  69                 [reg, stack_offset] = temp.pop()
  70                 restore_reg(reg, stack_offset, adjust_stack)
  71
  72         if adjust_stack:
  73                 print '\taddq\t$%u, %%rsp' % (adjust_stack)
  74         return
  75
  76
  77 def save_reg(reg, offset, use_move):
  78         if use_move:
  79                 if offset == 0:
  80                         print '\tmovq\t%s, (%%rsp)' % (reg)
  81                 else:
  82                         print '\tmovq\t%s, %u(%%rsp)' % (reg, offset)
  83         else:
  84                 print '\tpushq\t%s' % (reg)
  85
  86         return
  87
  88
  89 def restore_reg(reg, offset, use_move):
  90         if use_move:
  91                 if offset == 0:
  92                         print '\tmovq\t(%%rsp), %s' % (reg)
  93                 else:
  94                         print '\tmovq\t%u(%%rsp), %s' % (offset, reg)
  95         else:
  96                 print '\tpopq\t%s' % (reg)
  97
  98         return
  99
 100
 101 class PrintGenericStubs(gl_XML.gl_print_base):
 102
 103         def __init__(self):
 104                 gl_XML.gl_print_base.__init__(self)
 105
 106                 self.name = "gl_x86-64_asm.py (from Mesa)"
 107                 self.license = license.bsd_license_template % ("(C) Copyright IBM Corporation 2005", "IBM")
 108                 return
 109
 110
 111         def get_stack_size(self, f):
 112                 size = 0
 113                 for p in f.parameterIterator():
 114                         size += p.get_stack_size()
 115
 116                 return size
 117
 118
 119         def printRealHeader(self):
 120                 print "/* If we build with gcc's -fvisibility=hidden flag, we'll need to change"
 121                 print " * the symbol visibility mode to 'default'."
 122                 print ' */'
 123                 print ''
 124                 print '#include "../x86/assyntax.h"'
 125                 print ''
 126                 print '#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 303'
 127                 print '#  pragma GCC visibility push(default)'
 128                 print '#  define HIDDEN(x) .hidden x'
 129                 print '#else'
 130                 print '#  define HIDDEN(x)'
 131                 print '#endif'
 132                 print ''
 133                 print '# if defined(USE_MGL_NAMESPACE)'
 134                 print '#  define GL_PREFIX(n) GLNAME(CONCAT(mgl,n))'
 135                 print '# else'
 136                 print '#  define GL_PREFIX(n) GLNAME(CONCAT(gl,n))'
 137                 print '# endif'
 138                 print ''
 139                 print '#if defined(PTHREADS) || defined(USE_XTHREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || defined(BEOS_THREADS)'
 140                 print '#  define THREADS'
 141                 print '#endif'
 142                 print ''
 143                 print '\t.text'
 144                 print ''
 145                 print '#ifdef GLX_USE_TLS'
 146                 print ''
 147                 print '\t.globl _x86_64_get_get_dispatch; HIDDEN(_x86_64_get_get_dispatch)'
 148                 print '_x86_64_get_get_dispatch:'
 149                 print '\tlea\t_x86_64_get_dispatch(%rip), %rax'
 150                 print '\tret'
 151                 print ''
 152                 print '\t.p2align\t4,,15'
 153                 print '_x86_64_get_dispatch:'
 154                 print '\tmovq\t_glapi_tls_Dispatch@GOTTPOFF(%rip), %rax'
 155                 print '\tmovq\t%fs:(%rax), %rax'
 156                 print '\tret'
 157                 print '\t.size\t_x86_64_get_dispatch, .-_x86_64_get_dispatch'
 158                 print ''
 159                 print '#elif defined(PTHREADS)'
 160                 print ''
 161                 print '\t.extern\t_glapi_Dispatch'
 162                 print '\t.extern\t_gl_DispatchTSD'
 163                 print '\t.extern\tpthread_getspecific'
 164                 print ''
 165                 print '\t.p2align\t4,,15'
 166                 print '_x86_64_get_dispatch:'
 167                 print '\tmovq\t_gl_DispatchTSD(%rip), %rdi'
 168                 print '\tjmp\tpthread_getspecific@PLT'
 169                 print ''
 170                 print '#elif defined(THREADS)'
 171                 print ''
 172                 print '\t.extern\t_glapi_get_dispatch'
 173                 print ''
 174                 print '#endif'
 175                 print ''
 176                 return
 177
 178
 179         def printRealFooter(self):
 180                 print ''
 181                 print '#if defined(GLX_USE_TLS) && defined(__linux__)'
 182                 print ' .section ".note.ABI-tag", "a"'
 183                 print ' .p2align 2'
 184                 print ' .long   1f - 0f   /* name length */'
 185                 print ' .long   3f - 2f   /* data length */'
 186                 print ' .long   1         /* note length */'
 187                 print '0:       .asciz "GNU"      /* vendor name */'
 188                 print '1:       .p2align 2'
 189                 print '2:       .long   0         /* note data: the ABI tag */'
 190                 print ' .long   2,4,20    /* Minimum kernel version w/TLS */'
 191                 print '3:       .p2align 2        /* pad out section */'
 192                 print '#endif /* GLX_USE_TLS */'
 193                 return
 194
 195
 196         def printFunction(self, f):
 197
 198                 # The x86-64 ABI divides function parameters into a couple
 199                 # classes.  For the OpenGL interface, the only ones that are
 200                 # relevent are INTEGER and SSE.  Basically, the first 8
 201                 # GLfloat or GLdouble parameters are placed in %xmm0 - %xmm7,
 202                 # the first 6 non-GLfloat / non-GLdouble parameters are placed
 203                 # in registers listed in int_parameters.
 204                 #
 205                 # If more parameters than that are required, they are passed
 206                 # on the stack.  Therefore, we just have to make sure that
 207                 # %esp hasn't changed when we jump to the actual function.
 208                 # Since we're jumping to the function (and not calling it), we
 209                 # have to make sure of that anyway!
 210
 211                 int_parameters = ["%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9"]
 212
 213                 int_class = 0
 214                 sse_class = 0
 215                 stack_offset = 0
 216                 registers = []
 217                 for p in f.parameterIterator():
 218                         type_name = p.get_base_type_string()
 219
 220                         if p.is_pointer() or (type_name != "GLfloat" and type_name != "GLdouble"):
 221                                 if int_class < 6:
 222                                         registers.append( [int_parameters[int_class], stack_offset] )
 223                                         int_class += 1
 224                                         stack_offset += 8
 225                         else:
 226                                 if sse_class < 8:
 227                                         registers.append( ["%%xmm%u" % (sse_class), stack_offset] )
 228                                         sse_class += 1
 229                                         stack_offset += 8
 230
 231                 if ((int_class & 1) == 0) and (sse_class == 0):
 232                         registers.append( ["%rbp", 0] )
 233
 234
 235                 print '\t.p2align\t4,,15'
 236                 print '\t.globl\tGL_PREFIX(%s)' % (f.name)
 237                 print '\t.type\tGL_PREFIX(%s), @function' % (f.name)
 238                 print 'GL_PREFIX(%s):' % (f.name)
 239                 print '#if defined(GLX_USE_TLS)'
 240                 print '\tcall\t_x86_64_get_dispatch@PLT'
 241                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 242                 print '\tjmp\t*%r11'
 243                 print '#elif defined(PTHREADS)'
 244
 245                 save_all_regs(registers)
 246                 print '\tcall\t_x86_64_get_dispatch@PLT'
 247                 restore_all_regs(registers)
 248
 249                 if f.offset == 0:
 250                         print '\tmovq\t(%rax), %r11'
 251                 else:
 252                         print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 253
 254                 print '\tjmp\t*%r11'
 255
 256                 print '#else'
 257                 print '\tmovq\t_glapi_Dispatch(%rip), %rax'
 258                 print '\ttestq\t%rax, %rax'
 259                 print '\tje\t1f'
 260                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 261                 print '\tjmp\t*%r11'
 262                 print '1:'
 263
 264                 save_all_regs(registers)
 265                 print '\tcall\t_glapi_get_dispatch'
 266                 restore_all_regs(registers)
 267
 268                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 269                 print '\tjmp\t*%r11'
 270                 print '#endif /* defined(GLX_USE_TLS) */'
 271
 272                 print '\t.size\tGL_PREFIX(%s), .-GL_PREFIX(%s)' % (f.name, f.name)
 273                 print ''
 274                 return
 275
 276
 277         def printBody(self, api):
 278                 for f in api.functionIterateByOffset():
 279                         self.printFunction(f)
 280
 281
 282                 for f in api.functionIterateByOffset():
 283                         for n in f.entry_points:
 284                                 if n != f.name:
 285                                         print '\t.globl GL_PREFIX(%s) ; .set GL_PREFIX(%s), GL_PREFIX(%s)' % (n, n, f.name)
 286
 287                 return
 288
 289 def show_usage():
 290         print "Usage: %s [-f input_file_name] [-m output_mode]" % sys.argv[0]
 291         sys.exit(1)
 292
 293 if __name__ == '__main__':
 294         file_name = "gl_API.xml"
 295         mode = "generic"
 296
 297         try:
 298                 (args, trail) = getopt.getopt(sys.argv[1:], "m:f:")
 299         except Exception,e:
 300                 show_usage()
 301
 302         for (arg,val) in args:
 303                 if arg == '-m':
 304                         mode = val
 305                 elif arg == "-f":
 306                         file_name = val
 307
 308         if mode == "generic":
 309                 printer = PrintGenericStubs()
 310         else:
 311                 print "ERROR: Invalid mode \"%s\" specified." % mode
 312                 show_usage()
 313
 314         api = gl_XML.parse_GL_API( file_name )
 315
 316         printer.Print( api )