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authorRoland McGrath <roland@redhat.com>2008-07-27 02:51:35 -0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 02:30:49 -0400
commitf1ba12856b7a7d43e495e216bc91e6bbf7aac383 (patch)
treedd222ece64f06306ef85272654b6251a29632739 /include
parent4f72c4279eab1e5f3ed1ac4e55d4527617582392 (diff)
powerpc: Add asm/syscall.h with the tracehook entry points
Add asm/syscall.h for powerpc with all the required entry points. This will allow arch-independent tracing code for system calls. BenH: Fixed up use of regs->trap to properly mask low bit Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-powerpc/ptrace.h1
-rw-r--r--include/asm-powerpc/syscall.h84
2 files changed, 85 insertions, 0 deletions
diff --git a/include/asm-powerpc/ptrace.h b/include/asm-powerpc/ptrace.h
index 3d6e31024e56..734e0754fb9b 100644
--- a/include/asm-powerpc/ptrace.h
+++ b/include/asm-powerpc/ptrace.h
@@ -84,6 +84,7 @@ struct pt_regs {
84#ifndef __ASSEMBLY__ 84#ifndef __ASSEMBLY__
85 85
86#define instruction_pointer(regs) ((regs)->nip) 86#define instruction_pointer(regs) ((regs)->nip)
87#define user_stack_pointer(regs) ((regs)->gpr[1])
87#define regs_return_value(regs) ((regs)->gpr[3]) 88#define regs_return_value(regs) ((regs)->gpr[3])
88 89
89#ifdef CONFIG_SMP 90#ifdef CONFIG_SMP
diff --git a/include/asm-powerpc/syscall.h b/include/asm-powerpc/syscall.h
new file mode 100644
index 000000000000..efa7f0b879f3
--- /dev/null
+++ b/include/asm-powerpc/syscall.h
@@ -0,0 +1,84 @@
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 <linux/sched.h>
17
18static inline long syscall_get_nr(struct task_struct *task,
19 struct pt_regs *regs)
20{
21 return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L;
22}
23
24static inline void syscall_rollback(struct task_struct *task,
25 struct pt_regs *regs)
26{
27 regs->gpr[3] = regs->orig_gpr3;
28}
29
30static inline long syscall_get_error(struct task_struct *task,
31 struct pt_regs *regs)
32{
33 return (regs->ccr & 0x1000) ? -regs->gpr[3] : 0;
34}
35
36static inline long syscall_get_return_value(struct task_struct *task,
37 struct pt_regs *regs)
38{
39 return regs->gpr[3];
40}
41
42static inline void syscall_set_return_value(struct task_struct *task,
43 struct pt_regs *regs,
44 int error, long val)
45{
46 if (error) {
47 regs->ccr |= 0x1000L;
48 regs->gpr[3] = -error;
49 } else {
50 regs->ccr &= ~0x1000L;
51 regs->gpr[3] = val;
52 }
53}
54
55static inline void syscall_get_arguments(struct task_struct *task,
56 struct pt_regs *regs,
57 unsigned int i, unsigned int n,
58 unsigned long *args)
59{
60 BUG_ON(i + n > 6);
61#ifdef CONFIG_PPC64
62 if (test_tsk_thread_flag(task, TIF_32BIT)) {
63 /*
64 * Zero-extend 32-bit argument values. The high bits are
65 * garbage ignored by the actual syscall dispatch.
66 */
67 while (n-- > 0)
68 args[n] = (u32) regs->gpr[3 + i + n];
69 return;
70 }
71#endif
72 memcpy(args, &regs->gpr[3 + i], n * sizeof(args[0]));
73}
74
75static inline void syscall_set_arguments(struct task_struct *task,
76 struct pt_regs *regs,
77 unsigned int i, unsigned int n,
78 const unsigned long *args)
79{
80 BUG_ON(i + n > 6);
81 memcpy(&regs->gpr[3 + i], args, n * sizeof(args[0]));
82}
83
84#endif /* _ASM_SYSCALL_H */