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/* syscall defines and inlines
* Copyright (C) 2008 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _SYSCALL_H_ /* -*- linux-c -*- */
#define _SYSCALL_H_
#if defined(__i386__) || defined(CONFIG_IA32_EMULATION)
#define __MMAP_SYSCALL_NO_IA32 192 /* mmap2 */
#define __MPROTECT_SYSCALL_NO_IA32 125
#define __MUNMAP_SYSCALL_NO_IA32 91
#define __MREMAP_SYSCALL_NO_IA32 163
# if !defined(CONFIG_IA32_EMULATION)
#define MMAP_SYSCALL_NO(tsk) __MMAP_SYSCALL_NO_IA32
#define MPROTECT_SYSCALL_NO(tsk) __MPROTECT_SYSCALL_NO_IA32
#define MUNMAP_SYSCALL_NO(tsk) __MUNMAP_SYSCALL_NO_IA32
#define MREMAP_SYSCALL_NO(tsk) __MREMAP_SYSCALL_NO_IA32
# endif
#endif
#if defined(__x86_64__)
#define __MMAP_SYSCALL_NO_X86_64 9
#define __MPROTECT_SYSCALL_NO_X86_64 10
#define __MUNMAP_SYSCALL_NO_X86_64 11
#define __MREMAP_SYSCALL_NO_X86_64 25
# if defined(CONFIG_IA32_EMULATION)
#define MMAP_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
? __MMAP_SYSCALL_NO_IA32 \
: __MMAP_SYSCALL_NO_X86_64)
#define MPROTECT_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
? __MPROTECT_SYSCALL_NO_IA32 \
: __MPROTECT_SYSCALL_NO_X86_64)
#define MUNMAP_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
? __MUNMAP_SYSCALL_NO_IA32 \
: __MUNMAP_SYSCALL_NO_X86_64)
#define MREMAP_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
? __MREMAP_SYSCALL_NO_IA32 \
: __MREMAP_SYSCALL_NO_X86_64)
# else
#define MMAP_SYSCALL_NO(tsk) __MMAP_SYSCALL_NO_X86_64
#define MPROTECT_SYSCALL_NO(tsk) __MPROTECT_SYSCALL_NO_X86_64
#define MUNMAP_SYSCALL_NO(tsk) __MUNMAP_SYSCALL_NO_X86_64
#define MREMAP_SYSCALL_NO(tsk) __MREMAP_SYSCALL_NO_X86_64
# endif
#endif
#if !defined(MMAP_SYSCALL_NO) || !defined(MPROTECT_SYSCALL_NO) \
|| !defined(MUNMAP_SYSCALL_NO) || !defined(MREMAP_SYSCALL_NO)
#error "Unimplemented architecture"
#endif
#if defined(__i386__) || defined(__x86_64__)
static inline unsigned long
__stp_user_syscall_nr(struct pt_regs *regs)
{
#if defined(STAPCONF_X86_UNIREGS)
return regs->orig_ax;
#elif defined(__x86_64__)
return regs->orig_rax;
#elif defined (__i386__)
return regs->orig_eax;
#endif
}
#endif
#if defined(__i386__) || defined(__x86_64__)
static inline long *
__stp_user_syscall_return_value(struct task_struct *task, struct pt_regs *regs)
{
#ifdef CONFIG_IA32_EMULATION
// This code works, but isn't what we need. Since
// __stp_user_syscall_arg() doesn't sign-extend, a value passed in as
// an argument and then returned won't compare correctly anymore. So,
// for now, disable this code.
# if 0
if (test_tsk_thread_flag(task, TIF_IA32))
// Sign-extend the value so (int)-EFOO becomes (long)-EFOO
// and will match correctly in comparisons.
regs->ax = (long) (int) regs->ax;
# endif
#endif
return ®s->ax;
}
#endif
#if defined(__i386__) || defined(__x86_64__)
static inline long *
__stp_user_syscall_arg(struct task_struct *task, struct pt_regs *regs,
unsigned int n)
{
#if defined(CONFIG_X86_32)
if (n > 5) {
_stp_error("syscall arg > 5");
return NULL;
}
return ®s->bx + n;
#elif defined(CONFIG_X86_64)
#ifdef CONFIG_IA32_EMULATION
if (test_tsk_thread_flag(task, TIF_IA32))
switch (n) {
case 0: return ®s->bx;
case 1: return ®s->cx;
case 2: return ®s->dx;
case 3: return ®s->si;
case 4: return ®s->di;
case 5: return ®s->bp;
default:
_stp_error("syscall arg > 5");
return NULL;
}
#endif /* CONFIG_IA32_EMULATION */
switch (n) {
case 0: return ®s->di;
case 1: return ®s->si;
case 2: return ®s->dx;
case 3: return ®s->r10;
case 4: return ®s->r8;
case 5: return ®s->r9;
default:
_stp_error("syscall arg > 5");
return NULL;
}
#endif /* CONFIG_X86_32 */
}
#endif
#endif /* _SYSCALL_H_ */
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