xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] ptrace changes

Browse Source 
* System call parameter and result access functions
* Add tracehook calls
* Split syscall_trace into two functions do_syscall_trace_enter and
  do_syscall_trace_exit

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2008-10-10 21:33:20 +02:00
parent d86730bb95
commit 753c4dd6a2
8 changed files with 202 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

80
arch/s390/include/asm/syscall.h Normal file
View File

@@ -0,0 +1,80 @@
/*
* Access to user system call parameters and results
*
* Copyright IBM Corp. 2008
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
* as published by the Free Software Foundation.
*/
#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H 1
#include <asm/ptrace.h>
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
if (regs->trap != __LC_SVC_OLD_PSW)
return -1;
return regs->gprs[2];
}
static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
regs->gprs[2] = regs->orig_gpr2;
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
return (regs->gprs[2] >= -4096UL) ? -regs->gprs[2] : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->gprs[2];
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
regs->gprs[2] = error ? -error : val;
}
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);
#ifdef CONFIG_COMPAT
if (test_tsk_thread_flag(task, TIF_31BIT)) {
if (i + n == 6)
args[--n] = (u32) regs->args[0];
while (n-- > 0)
args[n] = (u32) regs->gprs[2 + i + n];
}
#endif
if (i + n == 6)
args[--n] = regs->args[0];
memcpy(args, &regs->gprs[2 + 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);
if (i + n == 6)
regs->args[0] = args[--n];
memcpy(&regs->gprs[2 + i], args, n * sizeof(args[0]));
}
#endif /* _ASM_SYSCALL_H */