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