139 lines
4.6 KiB
Python
Executable File
139 lines
4.6 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# generate_asm.py
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#
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# This source file is part of the FoundationDB open source project
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#
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# Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import re
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import sys
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(platform, source, asm, h) = sys.argv[1:]
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functions = {}
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func_re = re.compile(
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"^\s*FDB_API_(?:CHANGED|REMOVED)\s*\(\s*([^,]*),\s*([^)]*)\).*")
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with open(source, 'r') as srcfile:
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for l in srcfile:
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m = func_re.match(l)
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if m:
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func, ver = m.groups()
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if func not in functions:
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functions[func] = []
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ver = int(ver)
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if ver not in functions[func]:
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functions[func].append(ver)
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def write_windows_asm(asmfile, functions):
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asmfile.write(".data\n")
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for f in functions:
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asmfile.write("\textern fdb_api_ptr_%s:qword\n" % f)
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asmfile.write("\n.code\n")
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for f in functions:
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asmfile.write("\n%s proc EXPORT\n" % f)
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asmfile.write("\tmov r11, qword ptr [fdb_api_ptr_%s]\n" % f)
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asmfile.write("\tjmp r11\n")
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asmfile.write("%s endp\n" % f)
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asmfile.write("\nEND\n")
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def write_unix_asm(asmfile, functions, prefix):
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if platform != "linux-aarch64":
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asmfile.write(".intel_syntax noprefix\n")
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if platform.startswith('linux') or platform == "freebsd":
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asmfile.write("\n.data\n")
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for f in functions:
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asmfile.write("\t.extern fdb_api_ptr_%s\n" % f)
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asmfile.write("\n.text\n")
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for f in functions:
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asmfile.write("\t.global %s\n\t.type %s, @function\n" % (f, f))
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for f in functions:
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asmfile.write("\n.globl %s%s\n" % (prefix, f))
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asmfile.write("%s%s:\n" % (prefix, f))
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# These assembly implementations of versioned fdb c api functions must have the following properties.
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#
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# 1. Don't require dynamic relocation.
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#
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# 2. Perform a tail-call to the function pointer that works for a
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# function with any number of arguments. For example, since registers x0-x7 are used
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# to pass arguments in the Arm calling convention we must not use x0-x7
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# here.
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#
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# You can compile this example c program to get a rough idea of how to
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# load the extern symbol and make a tail call.
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#
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# $ cat test.c
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# typedef int (*function)();
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# extern function f;
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# int g() { return f(); }
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# $ cc -S -O3 -fPIC test.c && grep -A 10 '^g:' test.[sS]
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# g:
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# .LFB0:
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# .cfi_startproc
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# adrp x0, :got:f
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# ldr x0, [x0, #:got_lo12:f]
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# ldr x0, [x0]
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# br x0
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# .cfi_endproc
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# .LFE0:
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# .size g, .-g
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# .ident "GCC: (GNU) 8.3.1 20190311 (Red Hat 8.3.1-3)"
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if platform == "linux-aarch64":
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asmfile.write("\tadrp x8, :got:fdb_api_ptr_%s\n" % (f))
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asmfile.write("\tldr x8, [x8, #:got_lo12:fdb_api_ptr_%s]\n" % (f))
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asmfile.write("\tldr x8, [x8]\n")
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asmfile.write("\tbr x8\n")
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else:
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asmfile.write(
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"\tmov r11, qword ptr [%sfdb_api_ptr_%s@GOTPCREL+rip]\n" % (prefix, f))
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asmfile.write("\tmov r11, qword ptr [r11]\n")
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asmfile.write("\tjmp r11\n")
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with open(asm, 'w') as asmfile:
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with open(h, 'w') as hfile:
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hfile.write(
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"void fdb_api_ptr_unimpl() { fprintf(stderr, \"UNIMPLEMENTED FDB API FUNCTION\\n\"); abort(); }\n\n")
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hfile.write(
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"void fdb_api_ptr_removed() { fprintf(stderr, \"REMOVED FDB API FUNCTION\\n\"); abort(); }\n\n")
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if platform.startswith('linux'):
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write_unix_asm(asmfile, functions, '')
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elif platform == "osx":
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write_unix_asm(asmfile, functions, '_')
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elif platform == "windows":
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write_windows_asm(asmfile, functions)
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for f in functions:
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if platform == "windows":
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hfile.write("extern \"C\" ")
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hfile.write("void* fdb_api_ptr_%s = (void*)&fdb_api_ptr_unimpl;\n" % f)
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for v in functions[f]:
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hfile.write("#define %s_v%d_PREV %s_v%d\n" % (f, v, f, v - 1))
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