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 '#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 303'
 124                 print '#  pragma GCC visibility push(default)'
 125                 print '#  define HIDDEN(x) .hidden x'
 126                 print '#else'
 127                 print '#  define HIDDEN(x)'
 128                 print '#endif'
 129                 print ''
 130                 print '#if defined(PTHREADS) || defined(USE_XTHREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || defined(BEOS_THREADS)'
 131                 print '#  define THREADS'
 132                 print '#endif'
 133                 print ''
 134                 print '\t.text'
 135                 print ''
 136                 print '#ifdef GLX_USE_TLS'
 137                 print ''
 138                 print '\t.globl _x86_64_get_get_dispatch; HIDDEN(_x86_64_get_get_dispatch)'
 139                 print '_x86_64_get_get_dispatch:'
 140                 print '\tlea\t_x86_64_get_dispatch(%rip), %rax'
 141                 print '\tret'
 142                 print ''
 143                 print '\t.p2align\t4,,15'
 144                 print '_x86_64_get_dispatch:'
 145                 print '\tmovq\t_glapi_tls_Dispatch@GOTTPOFF(%rip), %rax'
 146                 print '\tmovq\t%fs:(%rax), %rax'
 147                 print '\tret'
 148                 print '\t.size\t_x86_64_get_dispatch, .-_x86_64_get_dispatch'
 149                 print ''
 150                 print '#elif defined(PTHREADS)'
 151                 print ''
 152                 print '\t.extern\t_glapi_Dispatch'
 153                 print '\t.extern\t_gl_DispatchTSD'
 154                 print '\t.extern\tpthread_getspecific'
 155                 print ''
 156                 print '\t.p2align\t4,,15'
 157                 print '_x86_64_get_dispatch:'
 158                 print '\tmovq\t_gl_DispatchTSD(%rip), %rdi'
 159                 print '\tjmp\tpthread_getspecific@PLT'
 160                 print ''
 161                 print '#elif defined(THREADS)'
 162                 print ''
 163                 print '\t.extern\t_glapi_get_dispatch'
 164                 print ''
 165                 print '#endif'
 166                 print ''
 167                 return
 168
 169
 170         def printRealFooter(self):
 171                 print ''
 172                 print '#if defined(GLX_USE_TLS) && defined(__linux__)'
 173                 print ' .section ".note.ABI-tag", "a"'
 174                 print ' .p2align 2'
 175                 print ' .long   1f - 0f   /* name length */'
 176                 print ' .long   3f - 2f   /* data length */'
 177                 print ' .long   1         /* note length */'
 178                 print '0:       .asciz "GNU"      /* vendor name */'
 179                 print '1:       .p2align 2'
 180                 print '2:       .long   0         /* note data: the ABI tag */'
 181                 print ' .long   2,4,20    /* Minimum kernel version w/TLS */'
 182                 print '3:       .p2align 2        /* pad out section */'
 183                 print '#endif /* GLX_USE_TLS */'
 184                 return
 185
 186
 187         def printFunction(self, f):
 188
 189                 # The x86-64 ABI divides function parameters into a couple
 190                 # classes.  For the OpenGL interface, the only ones that are
 191                 # relevent are INTEGER and SSE.  Basically, the first 8
 192                 # GLfloat or GLdouble parameters are placed in %xmm0 - %xmm7,
 193                 # the first 6 non-GLfloat / non-GLdouble parameters are placed
 194                 # in registers listed in int_parameters.
 195                 #
 196                 # If more parameters than that are required, they are passed
 197                 # on the stack.  Therefore, we just have to make sure that
 198                 # %esp hasn't changed when we jump to the actual function.
 199                 # Since we're jumping to the function (and not calling it), we
 200                 # have to make sure of that anyway!
 201
 202                 int_parameters = ["%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9"]
 203
 204                 int_class = 0
 205                 sse_class = 0
 206                 stack_offset = 0
 207                 registers = []
 208                 for p in f.parameterIterator():
 209                         type_name = p.get_base_type_string()
 210
 211                         if p.is_pointer() or (type_name != "GLfloat" and type_name != "GLdouble"):
 212                                 if int_class < 6:
 213                                         registers.append( [int_parameters[int_class], stack_offset] )
 214                                         int_class += 1
 215                                         stack_offset += 8
 216                         else:
 217                                 if sse_class < 8:
 218                                         registers.append( ["%%xmm%u" % (sse_class), stack_offset] )
 219                                         sse_class += 1
 220                                         stack_offset += 8
 221
 222                 if ((int_class & 1) == 0) and (sse_class == 0):
 223                         registers.append( ["%rbp", 0] )
 224
 225
 226                 print '\t.p2align\t4,,15'
 227                 print '\t.globl\tgl%s' % (f.name)
 228                 print '\t.type\tgl%s, @function' % (f.name)
 229                 print 'gl%s:' % (f.name)
 230                 print '#if defined(GLX_USE_TLS)'
 231                 print '\tcall\t_x86_64_get_dispatch@PLT'
 232                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 233                 print '\tjmp\t*%r11'
 234                 print '#elif defined(PTHREADS)'
 235
 236                 save_all_regs(registers)
 237                 print '\tcall\t_x86_64_get_dispatch@PLT'
 238                 restore_all_regs(registers)
 239
 240                 if f.offset == 0:
 241                         print '\tmovq\t(%rax), %r11'
 242                 else:
 243                         print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 244
 245                 print '\tjmp\t*%r11'
 246
 247                 print '#else'
 248                 print '\tmovq\t_glapi_DispatchTSD(%rip), %rax'
 249                 print '\ttestq\t%rax, %rax'
 250                 print '\tje\t1f'
 251                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 252                 print '\tjmp\t*%r11'
 253                 print '1:'
 254
 255                 save_all_regs(registers)
 256                 print '\tcall\t_glapi_get_dispatch'
 257                 restore_all_regs(registers)
 258
 259                 print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
 260                 print '\tjmp\t*%r11'
 261                 print '#endif /* defined(GLX_USE_TLS) */'
 262
 263                 print '\t.size\tgl%s, .-gl%s' % (f.name, f.name)
 264                 print ''
 265                 return
 266
 267
 268         def printBody(self, api):
 269                 for f in api.functionIterateByOffset():
 270                         self.printFunction(f)
 271
 272
 273                 for f in api.functionIterateByOffset():
 274                         for n in f.entry_points:
 275                                 if n != f.name:
 276                                         print '\t.globl gl%s ; .set gl%s, gl%s' % (n, n, f.name)
 277
 278                 return
 279
 280 def show_usage():
 281         print "Usage: %s [-f input_file_name] [-m output_mode]" % sys.argv[0]
 282         sys.exit(1)
 283
 284 if __name__ == '__main__':
 285         file_name = "gl_API.xml"
 286         mode = "generic"
 287
 288         try:
 289                 (args, trail) = getopt.getopt(sys.argv[1:], "m:f:")
 290         except Exception,e:
 291                 show_usage()
 292
 293         for (arg,val) in args:
 294                 if arg == '-m':
 295                         mode = val
 296                 elif arg == "-f":
 297                         file_name = val
 298
 299         if mode == "generic":
 300                 printer = PrintGenericStubs()
 301         else:
 302                 print "ERROR: Invalid mode \"%s\" specified." % mode
 303                 show_usage()
 304
 305         api = gl_XML.parse_GL_API( file_name )
 306
 307         printer.Print( api )