~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/include/asm/syscall.h

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Access to user system call parameters and results
  3  *
  4  * Copyright (C) 2008 Red Hat, Inc.  All rights reserved.
  5  *
  6  * This copyrighted material is made available to anyone wishing to use,
  7  * modify, copy, or redistribute it subject to the terms and conditions
  8  * of the GNU General Public License v.2.
  9  *
 10  * See asm-generic/syscall.h for descriptions of what we must do here.
 11  */
 12 
 13 #ifndef _ASM_SYSCALL_H
 14 #define _ASM_SYSCALL_H  1
 15 
 16 #include <uapi/linux/audit.h>
 17 #include <linux/sched.h>
 18 #include <linux/thread_info.h>
 19 
 20 /* ftrace syscalls requires exporting the sys_call_table */
 21 #ifdef CONFIG_FTRACE_SYSCALLS
 22 extern const unsigned long sys_call_table[];
 23 #endif /* CONFIG_FTRACE_SYSCALLS */
 24 
 25 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 26 {
 27         /*
 28          * Note that we are returning an int here. That means 0xffffffff, ie.
 29          * 32-bit negative 1, will be interpreted as -1 on a 64-bit kernel.
 30          * This is important for seccomp so that compat tasks can set r0 = -1
 31          * to reject the syscall.
 32          */
 33         return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1;
 34 }
 35 
 36 static inline void syscall_rollback(struct task_struct *task,
 37                                     struct pt_regs *regs)
 38 {
 39         regs->gpr[3] = regs->orig_gpr3;
 40 }
 41 
 42 static inline long syscall_get_return_value(struct task_struct *task,
 43                                             struct pt_regs *regs)
 44 {
 45         return regs->gpr[3];
 46 }
 47 
 48 static inline void syscall_set_return_value(struct task_struct *task,
 49                                             struct pt_regs *regs,
 50                                             int error, long val)
 51 {
 52         /*
 53          * In the general case it's not obvious that we must deal with CCR
 54          * here, as the syscall exit path will also do that for us. However
 55          * there are some places, eg. the signal code, which check ccr to
 56          * decide if the value in r3 is actually an error.
 57          */
 58         if (error) {
 59                 regs->ccr |= 0x10000000L;
 60                 regs->gpr[3] = error;
 61         } else {
 62                 regs->ccr &= ~0x10000000L;
 63                 regs->gpr[3] = val;
 64         }
 65 }
 66 
 67 static inline void syscall_get_arguments(struct task_struct *task,
 68                                          struct pt_regs *regs,
 69                                          unsigned int i, unsigned int n,
 70                                          unsigned long *args)
 71 {
 72         unsigned long val, mask = -1UL;
 73 
 74         BUG_ON(i + n > 6);
 75 
 76 #ifdef CONFIG_COMPAT
 77         if (test_tsk_thread_flag(task, TIF_32BIT))
 78                 mask = 0xffffffff;
 79 #endif
 80         while (n--) {
 81                 if (n == 0 && i == 0)
 82                         val = regs->orig_gpr3;
 83                 else
 84                         val = regs->gpr[3 + i + n];
 85 
 86                 args[n] = val & mask;
 87         }
 88 }
 89 
 90 static inline void syscall_set_arguments(struct task_struct *task,
 91                                          struct pt_regs *regs,
 92                                          unsigned int i, unsigned int n,
 93                                          const unsigned long *args)
 94 {
 95         BUG_ON(i + n > 6);
 96         memcpy(&regs->gpr[3 + i], args, n * sizeof(args[0]));
 97 
 98         /* Also copy the first argument into orig_gpr3 */
 99         if (i == 0 && n > 0)
100                 regs->orig_gpr3 = args[0];
101 }
102 
103 static inline int syscall_get_arch(void)
104 {
105         int arch = is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
106 #ifdef __LITTLE_ENDIAN__
107         arch |= __AUDIT_ARCH_LE;
108 #endif
109         return arch;
110 }
111 #endif  /* _ASM_SYSCALL_H */
112 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp