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