mirror of
https://github.com/UzixLS/KernelEx.git
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89 lines
2.5 KiB
C
Executable File
89 lines
2.5 KiB
C
Executable File
/*
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* KernelEx
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* Copyright (C) 2008, Xeno86
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*
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* This file is part of KernelEx source code.
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*
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* KernelEx is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* KernelEx is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifndef __UNIFWD_H
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#define __UNIFWD_H
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#pragma warning(disable:4409)
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int unifwd_init(void);
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unsigned long __stdcall GetUnicowsAddress(const char* name);
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/* Q: Why FORWARD_TO_UNICOWS macro is in asm?
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* A: We don't know the parameters of called function
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* so we can't call the function in C
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*
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* Note that the code below would be correct if all compilers translated
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* the 'return' line to JMP instruction but it is not always the case
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* and we can't rely on that so we workaround this writing the macro in asm.
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*
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* int __stdcall fun_fwd()
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* {
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* static const char* n = "fun";
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* static unsigned long ref = 0;
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* if (!ref)
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* ref = GetUnicowsAddress("fun");
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* return ((int (__stdcall *)())ref)();
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* }
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*/
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#ifdef __GNUC__
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/* How to make it less messy? */
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#define FORWARD_TO_UNICOWS(name) \
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__asm__( \
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".section .rdata,\"dr\"\n" \
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"LC_" #name ":\n\t" \
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".ascii \"" #name "\\0\"\n\t" \
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".text\n" \
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".globl _" #name "_fwd@0\n\t" \
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".def _" #name "fwd@0; .scl 2; .type 32; .endef\n" \
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"_" #name "_fwd@0:\n\t" \
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"cmpl $0, _ref_" #name "\n\t" \
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"jnz LOC_" #name "\n\t" \
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"pushl $LC_" #name "\n\t" \
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"call _GetUnicowsAddress@4\n\t" \
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"movl %eax, _ref_" #name "\n" \
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"LOC_" #name ":\n\t" \
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"movl _ref_" #name ", %eax\n\t" \
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"jmp *%eax\n" \
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".lcomm _ref_" #name ",4\n\t"
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#else
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#define FORWARD_TO_UNICOWS(name) \
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int __declspec(naked) __stdcall name##_fwd(void) \
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{ \
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static const char n[] = #name; \
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static unsigned long ref = 0; \
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__asm { cmp dword ptr [ref], 0} \
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__asm { jnz L1 } \
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__asm { push offset n } \
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__asm { call GetUnicowsAddress } \
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__asm { mov dword ptr [ref], eax } \
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__asm { L1: jmp [ref] } \
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}
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#endif /* #ifdef __GNUC__ */
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#endif
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