ipc-invoke.h

 
/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>,
 *               Björn Döbel <doebel@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * License: see LICENSE.spdx (in this directory or the directories above)
 */
 
#pragma once
 
/*
 * Some words about the sysenter entry frame: Since the sysenter instruction
 * automatically reloads the instruction pointer (eip) and the stack pointer
 * (esp) after kernel entry, we have to save both registers preliminary to
 * that instruction. We use ecx to store the user-level esp and save eip onto
 * the stack. The ecx register contains the IPC timeout and has to be saved
 * onto the stack, too. The ebp register is saved for compatibility reasons
 * with the Hazelnut kernel. Both the esp and the ss register are also pushed
 * onto the stack to be able to return using the "lret" instruction from the
 * sysexit trampoline page if Small Address Spaces are enabled.
 */
 
#ifdef __PIC__
# define L4S_PIC_SAVE "push %%ebx; "
# define L4S_PIC_RESTORE "pop %%ebx; "
# define L4S_PIC_CLOBBER
# define L4S_PIC_SYSCALL , [func] "m" (__l4sys_invoke_indirect)
# if 1
extern void (*__l4sys_invoke_indirect)(void);
#  define IPC_SYSENTER      "# indirect sys invoke \n\t" \
                            "call *%[func]    \n\t"
# else
#  define L4S_PIC_SYSCALL
#  define IPC_SYSENTER      "call __l4sys_invoke_direct@plt    \n\t"
# endif
# define IPC_SYSENTER_ASM   call __l4sys_invoke_direct@plt
#else
#define IPC_SYSENTER      "call __l4sys_invoke_direct    \n\t"
#define IPC_SYSENTER_ASM   call __l4sys_invoke_direct
#  define L4S_PIC_SAVE
#  define L4S_PIC_RESTORE
#  define L4S_PIC_CLOBBER ,"ebx"
#  define L4S_PIC_SYSCALL
 
#endif
#define L4_ENTER_KERNEL L4S_PIC_SAVE "push %%ebp; " \
                        IPC_SYSENTER                \
                        " pop %%ebp; " L4S_PIC_RESTORE