L4Re Operating System Framework
Interface and Usage Documentation
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ipc-invoke.h
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/*
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* (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
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* Alexander Warg <warg@os.inf.tu-dresden.de>,
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* Björn Döbel <doebel@os.inf.tu-dresden.de>
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* economic rights: Technische Universität Dresden (Germany)
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*
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* This file is part of TUD:OS and distributed under the terms of the
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* GNU General Public License 2.
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* Please see the COPYING-GPL-2 file for details.
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*/
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#pragma once
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/*
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* Some words about the sysenter entry frame: Since the sysenter instruction
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* automatically reloads the instruction pointer (eip) and the stack pointer
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* (esp) after kernel entry, we have to save both registers preliminary to
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* that instruction. We use ecx to store the user-level esp and save eip onto
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* the stack. The ecx register contains the IPC timeout and has to be saved
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* onto the stack, too. The ebp register is saved for compatibility reasons
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* with the Hazelnut kernel. Both the esp and the ss register are also pushed
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* onto the stack to be able to return using the "lret" instruction from the
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* sysexit trampoline page if Small Address Spaces are enabled.
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*/
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#ifdef __PIC__
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# define L4S_PIC_SAVE "push %%ebx; "
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# define L4S_PIC_RESTORE "pop %%ebx; "
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# define L4S_PIC_CLOBBER
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# define L4S_PIC_SYSCALL , [func] "m" (__l4sys_invoke_indirect)
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# if 1
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extern
void (*__l4sys_invoke_indirect)(void);
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# define IPC_SYSENTER "# indirect sys invoke \n\t" \
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"call *%[func] \n\t"
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# else
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# define L4S_PIC_SYSCALL
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# define IPC_SYSENTER "call __l4sys_invoke_direct@plt \n\t"
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# endif
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# define IPC_SYSENTER_ASM call __l4sys_invoke_direct@plt
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#else
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#define IPC_SYSENTER "call __l4sys_invoke_direct \n\t"
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#define IPC_SYSENTER_ASM call __l4sys_invoke_direct
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# define L4S_PIC_SAVE
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# define L4S_PIC_RESTORE
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# define L4S_PIC_CLOBBER ,"ebx"
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# define L4S_PIC_SYSCALL
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#endif
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#define L4_ENTER_KERNEL L4S_PIC_SAVE "push %%ebp; " \
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IPC_SYSENTER \
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" pop %%ebp; " L4S_PIC_RESTORE
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x86
l4
sys
ipc-invoke.h
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