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Commit 68bd0f4e authored by Roland McGrath's avatar Roland McGrath
Browse files

x86: tracehook: asm/syscall.h 



Add asm/syscall.h for x86 with all the required entry points.
This will allow arch-independent tracing code for system calls.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
parent eeea3c3f

include/asm-x86/ptrace.h

+5 −0
Original line number Diff line number Diff line
@@ -213,6 +213,11 @@ static inline unsigned long frame_pointer(struct pt_regs *regs) 
	return regs->bp;

}



static inline unsigned long user_stack_pointer(struct pt_regs *regs)

{

	return regs->sp;

}



/*

 * These are defined as per linux/ptrace.h, which see.

 */

include/asm-x86/syscall.h

0 → 100644
+210 −0
Original line number Diff line number Diff line 
/*

 * Access to user system call parameters and results

 *

 * Copyright (C) 2008 Red Hat, Inc.  All rights reserved.

 *

 * This copyrighted material is made available to anyone wishing to use,

 * modify, copy, or redistribute it subject to the terms and conditions

 * of the GNU General Public License v.2.

 *

 * See asm-generic/syscall.h for descriptions of what we must do here.

 */



#ifndef _ASM_SYSCALL_H

#define _ASM_SYSCALL_H	1



#include <linux/sched.h>



static inline long syscall_get_nr(struct task_struct *task,

				  struct pt_regs *regs)

{

	/*

	 * We always sign-extend a -1 value being set here,

	 * so this is always either -1L or a syscall number.

	 */

	return regs->orig_ax;

}



static inline void syscall_rollback(struct task_struct *task,

				    struct pt_regs *regs)

{

	regs->ax = regs->orig_ax;

}



static inline long syscall_get_error(struct task_struct *task,

				     struct pt_regs *regs)

{

	unsigned long error = regs->ax;

#ifdef CONFIG_IA32_EMULATION

	/*

	 * TS_COMPAT is set for 32-bit syscall entries and then

	 * remains set until we return to user mode.

	 */

	if (task_thread_info(task)->status & TS_COMPAT)

		/*

		 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO

		 * and will match correctly in comparisons.

		 */

		error = (long) (int) error;

#endif

	return error >= -4095L ? error : 0;

}



static inline long syscall_get_return_value(struct task_struct *task,

					    struct pt_regs *regs)

{

	return regs->ax;

}



static inline void syscall_set_return_value(struct task_struct *task,

					    struct pt_regs *regs,

					    int error, long val)

{

	regs->ax = (long) error ?: val;

}



#ifdef CONFIG_X86_32



static inline void syscall_get_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

					 unsigned long *args)

{

	BUG_ON(i + n > 6);

	memcpy(args, &regs->bx + i, n * sizeof(args[0]));

}



static inline void syscall_set_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

					 const unsigned long *args)

{

	BUG_ON(i + n > 6);

	memcpy(&regs->bx + i, args, n * sizeof(args[0]));

}



#else	 /* CONFIG_X86_64 */



static inline void syscall_get_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

					 unsigned long *args)

{

# ifdef CONFIG_IA32_EMULATION

	if (task_thread_info(task)->status & TS_COMPAT)

		switch (i + n) {

		case 6:

			if (!n--) break;

			*args++ = regs->bp;

		case 5:

			if (!n--) break;

			*args++ = regs->di;

		case 4:

			if (!n--) break;

			*args++ = regs->si;

		case 3:

			if (!n--) break;

			*args++ = regs->dx;

		case 2:

			if (!n--) break;

			*args++ = regs->cx;

		case 1:

			if (!n--) break;

			*args++ = regs->bx;

		case 0:

			if (!n--) break;

		default:

			BUG();

			break;

		}

	else

# endif

		switch (i + n) {

		case 6:

			if (!n--) break;

			*args++ = regs->r9;

		case 5:

			if (!n--) break;

			*args++ = regs->r8;

		case 4:

			if (!n--) break;

			*args++ = regs->r10;

		case 3:

			if (!n--) break;

			*args++ = regs->dx;

		case 2:

			if (!n--) break;

			*args++ = regs->si;

		case 1:

			if (!n--) break;

			*args++ = regs->di;

		case 0:

			if (!n--) break;

		default:

			BUG();

			break;

		}

}



static inline void syscall_set_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

					 const unsigned long *args)

{

# ifdef CONFIG_IA32_EMULATION

	if (task_thread_info(task)->status & TS_COMPAT)

		switch (i + n) {

		case 6:

			if (!n--) break;

			regs->bp = *args++;

		case 5:

			if (!n--) break;

			regs->di = *args++;

		case 4:

			if (!n--) break;

			regs->si = *args++;

		case 3:

			if (!n--) break;

			regs->dx = *args++;

		case 2:

			if (!n--) break;

			regs->cx = *args++;

		case 1:

			if (!n--) break;

			regs->bx = *args++;

		case 0:

			if (!n--) break;

		default:

			BUG();

		}

	else

# endif

		switch (i + n) {

		case 6:

			if (!n--) break;

			regs->r9 = *args++;

		case 5:

			if (!n--) break;

			regs->r8 = *args++;

		case 4:

			if (!n--) break;

			regs->r10 = *args++;

		case 3:

			if (!n--) break;

			regs->dx = *args++;

		case 2:

			if (!n--) break;

			regs->si = *args++;

		case 1:

			if (!n--) break;

			regs->di = *args++;

		case 0:

			if (!n--) break;

		default:

			BUG();

		}

}



#endif	/* CONFIG_X86_32 */



#endif	/* _ASM_SYSCALL_H */