4 * \brief L4 IPC System Call Invoking in Assembler.
7 * This file can also be used in asm-files, so don't include C statements.
10 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
11 * Alexander Warg <warg@os.inf.tu-dresden.de>,
12 * Björn Döbel <doebel@os.inf.tu-dresden.de>
13 * economic rights: Technische Universität Dresden (Germany)
15 * This file is part of TUD:OS and distributed under the terms of the
16 * GNU General Public License 2.
17 * Please see the COPYING-GPL-2 file for details.
19 * As a special exception, you may use this file as part of a free software
20 * library without restriction. Specifically, if other files instantiate
21 * templates or use macros or inline functions from this file, or you compile
22 * this file and link it with other files to produce an executable, this
23 * file does not by itself cause the resulting executable to be covered by
24 * the GNU General Public License. This exception does not however
25 * invalidate any other reasons why the executable file might be covered by
26 * the GNU General Public License.
32 * Some words about the sysenter entry frame: Since the sysenter instruction
33 * automatically reloads the instruction pointer (eip) and the stack pointer
34 * (esp) after kernel entry, we have to save both registers preliminary to
35 * that instruction. We use ecx to store the user-level esp and save eip onto
36 * the stack. The ecx register contains the IPC timeout and has to be saved
37 * onto the stack, too. The ebp register is saved for compatibility reasons
38 * with the Hazelnut kernel. Both the esp and the ss register are also pushed
39 * onto the stack to be able to return using the "lret" instruction from the
40 * sysexit trampoline page if Small Address Spaces are enabled.
44 # define L4S_PIC_SAVE "push %%ebx; "
45 # define L4S_PIC_RESTORE "pop %%ebx; "
46 # define L4S_PIC_CLOBBER
48 # define IPC_SYSENTER "# indirect sys invoke \n\t" \
49 "call *__l4sys_invoke_indirect@GOTOFF(%%ebx) \n\t"
51 # define IPC_SYSENTER "call __l4sys_invoke_direct@plt \n\t"
53 # define IPC_SYSENTER_ASM call __l4sys_invoke_direct@plt
57 * \brief Kernel entry code for inline assembly.
59 #define IPC_SYSENTER "call __l4sys_invoke_direct \n\t"
62 * \brief Kernel entry code for assembler code.
64 #define IPC_SYSENTER_ASM call __l4sys_invoke_direct
67 * \brief Save PIC register, if needed.
72 * \brief Restore PIC register, if needed.
74 # define L4S_PIC_RESTORE
77 * \brief PIC clobber list.
79 # define L4S_PIC_CLOBBER ,"ebx"
83 * \brief Kernel entry code for inline assembly.
85 #define L4_ENTER_KERNEL L4S_PIC_SAVE "push %%ebp; " \
87 " pop %%ebp; " L4S_PIC_RESTORE