#!/usr/bin/env python
# (C) Copyright IBM Corporation 2005
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# on the rights to use, copy, modify, merge, publish, distribute, sub
# license, and/or sell copies of the Software, and to permit persons to whom
# the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
# IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
# Authors:
# Ian Romanick <idr@us.ibm.com>
import license
import gl_XML, glX_XML
import sys, getopt, copy
def should_use_push(registers):
for [reg, offset] in registers:
if reg[1:4] == "xmm":
return 0
N = len(registers)
return (N & 1) != 0
def local_size(registers):
# The x86-64 ABI says "the value (%rsp - 8) is always a multiple of
# 16 when control is transfered to the function entry point." This
# means that the local stack usage must be (16*N)+8 for some value
# of N. (16*N)+8 = (8*(2N))+8 = 8*(2N+1). As long as N is odd, we
# meet this requirement.
N = (len(registers) | 1)
return 8*N
def save_all_regs(registers):
adjust_stack = 0
if not should_use_push(registers):
adjust_stack = local_size(registers)
print '\tsubq\t$%u, %%rsp' % (adjust_stack)
for [reg, stack_offset] in registers:
save_reg( reg, stack_offset, adjust_stack )
return
def restore_all_regs(registers):
adjust_stack = 0
if not should_use_push(registers):
adjust_stack = local_size(registers)
temp = copy.deepcopy(registers)
while len(temp):
[reg, stack_offset] = temp.pop()
restore_reg(reg, stack_offset, adjust_stack)
if adjust_stack:
print '\taddq\t$%u, %%rsp' % (adjust_stack)
return
def save_reg(reg, offset, use_move):
if use_move:
if offset == 0:
print '\tmovq\t%s, (%%rsp)' % (reg)
else:
print '\tmovq\t%s, %u(%%rsp)' % (reg, offset)
else:
print '\tpushq\t%s' % (reg)
return
def restore_reg(reg, offset, use_move):
if use_move:
if offset == 0:
print '\tmovq\t(%%rsp), %s' % (reg)
else:
print '\tmovq\t%u(%%rsp), %s' % (offset, reg)
else:
print '\tpopq\t%s' % (reg)
return
class PrintGenericStubs(gl_XML.gl_print_base):
def __init__(self):
gl_XML.gl_print_base.__init__(self)
self.name = "gl_x86-64_asm.py (from Mesa)"
self.license = license.bsd_license_template % ("(C) Copyright IBM Corporation 2005", "IBM")
return
def get_stack_size(self, f):
size = 0
for p in f.parameterIterator():
size += p.get_stack_size()
return size
def printRealHeader(self):
print "/* If we build with gcc's -fvisibility=hidden flag, we'll need to change"
print " * the symbol visibility mode to 'default'."
print ' */'
print ''
print '#include "x86/assyntax.h"'
print ''
print '#ifdef __GNUC__'
print '# pragma GCC visibility push(default)'
print '# define HIDDEN(x) .hidden x'
print '#else'
print '# define HIDDEN(x)'
print '#endif'
print ''
print '# if defined(USE_MGL_NAMESPACE)'
print '# define GL_PREFIX(n) GLNAME(CONCAT(mgl,n))'
print '# define _glapi_Dispatch _mglapi_Dispatch'
print '# else'
print '# define GL_PREFIX(n) GLNAME(CONCAT(gl,n))'
print '# endif'
print ''
print '#if defined(PTHREADS) || defined(WIN32) || defined(BEOS_THREADS)'
print '# define THREADS'
print '#endif'
print ''
print '\t.text'
print ''
print '#ifdef GLX_USE_TLS'
print ''
print '\t.globl _x86_64_get_get_dispatch; HIDDEN(_x86_64_get_get_dispatch)'
print '_x86_64_get_get_dispatch:'
print '\tlea\t_x86_64_get_dispatch(%rip), %rax'
print '\tret'
print ''
print '\t.p2align\t4,,15'
print '_x86_64_get_dispatch:'
print '\tmovq\t_glapi_tls_Dispatch@GOTTPOFF(%rip), %rax'
print '\tmovq\t%fs:(%rax), %rax'
print '\tret'
print '\t.size\t_x86_64_get_dispatch, .-_x86_64_get_dispatch'
print ''
print '#elif defined(PTHREADS)'
print ''
print '\t.extern\t_glapi_Dispatch'
print '\t.extern\t_gl_DispatchTSD'
print '\t.extern\tpthread_getspecific'
print ''
print '\t.p2align\t4,,15'
print '_x86_64_get_dispatch:'
print '\tmovq\t_gl_DispatchTSD@GOTPCREL(%rip), %rax'
print '\tmovl\t(%rax), %edi'
print '\tjmp\tpthread_getspecific@PLT'
print ''
print '#elif defined(THREADS)'
print ''
print '\t.extern\t_glapi_get_dispatch'
print ''
print '#endif'
print ''
return
def printRealFooter(self):
print ''
print '#if defined(GLX_USE_TLS) && defined(__linux__)'
print ' .section ".note.ABI-tag", "a"'
print ' .p2align 2'
print ' .long 1f - 0f /* name length */'
print ' .long 3f - 2f /* data length */'
print ' .long 1 /* note length */'
print '0: .asciz "GNU" /* vendor name */'
print '1: .p2align 2'
print '2: .long 0 /* note data: the ABI tag */'
print ' .long 2,4,20 /* Minimum kernel version w/TLS */'
print '3: .p2align 2 /* pad out section */'
print '#endif /* GLX_USE_TLS */'
print ''
print '#if defined (__ELF__) && defined (__linux__)'
print ' .section .note.GNU-stack,"",%progbits'
print '#endif'
return
def printFunction(self, f):
# The x86-64 ABI divides function parameters into a couple
# classes. For the OpenGL interface, the only ones that are
# relevent are INTEGER and SSE. Basically, the first 8
# GLfloat or GLdouble parameters are placed in %xmm0 - %xmm7,
# the first 6 non-GLfloat / non-GLdouble parameters are placed
# in registers listed in int_parameters.
#
# If more parameters than that are required, they are passed
# on the stack. Therefore, we just have to make sure that
# %esp hasn't changed when we jump to the actual function.
# Since we're jumping to the function (and not calling it), we
# have to make sure of that anyway!
int_parameters = ["%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9"]
int_class = 0
sse_class = 0
stack_offset = 0
registers = []
for p in f.parameterIterator():
type_name = p.get_base_type_string()
if p.is_pointer() or (type_name != "GLfloat" and type_name != "GLdouble"):
if int_class < 6:
registers.append( [int_parameters[int_class], stack_offset] )
int_class += 1
stack_offset += 8
else:
if sse_class < 8:
registers.append( ["%%xmm%u" % (sse_class), stack_offset] )
sse_class += 1
stack_offset += 8
if ((int_class & 1) == 0) and (sse_class == 0):
registers.append( ["%rbp", 0] )
name = f.dispatch_name()
print '\t.p2align\t4,,15'
print '\t.globl\tGL_PREFIX(%s)' % (name)
print '\t.type\tGL_PREFIX(%s), @function' % (name)
if not f.is_static_entry_point(f.name):
print '\tHIDDEN(GL_PREFIX(%s))' % (name)
print 'GL_PREFIX(%s):' % (name)
print '#if defined(GLX_USE_TLS)'
print '\tcall\t_x86_64_get_dispatch@PLT'
print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
print '\tjmp\t*%r11'
print '#elif defined(PTHREADS)'
save_all_regs(registers)
print '\tcall\t_x86_64_get_dispatch@PLT'
restore_all_regs(registers)
if f.offset == 0:
print '\tmovq\t(%rax), %r11'
else:
print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
print '\tjmp\t*%r11'
print '#else'
print '\tmovq\t_glapi_Dispatch(%rip), %rax'
print '\ttestq\t%rax, %rax'
print '\tje\t1f'
print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
print '\tjmp\t*%r11'
print '1:'
save_all_regs(registers)
print '\tcall\t_glapi_get_dispatch'
restore_all_regs(registers)
print '\tmovq\t%u(%%rax), %%r11' % (f.offset * 8)
print '\tjmp\t*%r11'
print '#endif /* defined(GLX_USE_TLS) */'
print '\t.size\tGL_PREFIX(%s), .-GL_PREFIX(%s)' % (name, name)
print ''
return
def printBody(self, api):
for f in api.functionIterateByOffset():
self.printFunction(f)
for f in api.functionIterateByOffset():
dispatch = f.dispatch_name()
for n in f.entry_points:
if n != f.name:
if f.is_static_entry_point(n):
text = '\t.globl GL_PREFIX(%s) ; .set GL_PREFIX(%s), GL_PREFIX(%s)' % (n, n, dispatch)
if f.has_different_protocol(n):
print '#ifndef GLX_INDIRECT_RENDERING'
print text
print '#endif'
else:
print text
return
def show_usage():
print "Usage: %s [-f input_file_name] [-m output_mode]" % sys.argv[0]
sys.exit(1)
if __name__ == '__main__':
file_name = "gl_API.xml"
mode = "generic"
try:
(args, trail) = getopt.getopt(sys.argv[1:], "m:f:")
except Exception,e:
show_usage()
for (arg,val) in args:
if arg == '-m':
mode = val
elif arg == "-f":
file_name = val
if mode == "generic":
printer = PrintGenericStubs()
else:
print "ERROR: Invalid mode \"%s\" specified." % mode
show_usage()
api = gl_XML.parse_GL_API(file_name, glX_XML.glx_item_factory())
printer.Print(api)