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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-10-10 21:33:20 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-10-10 21:33:57 +0200
commit753c4dd6a2fa2af81f5d809d610d29f2d9dd9bc1 (patch)
treec6c1869a58357945e501b2eba3485ca154ee2f07 /arch/s390/include/asm/syscall.h
parentd86730bb9597b02bff59a3a5a01c0094d71a265f (diff)
downloadlinux-sh-753c4dd6a2fa2af81f5d809d610d29f2d9dd9bc1.tar.gz
[S390] ptrace changes
* 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>
Diffstat (limited to 'arch/s390/include/asm/syscall.h')
-rw-r--r--arch/s390/include/asm/syscall.h80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h
new file mode 100644
index 000000000000..6e623971fbb9
--- /dev/null
+++ b/arch/s390/include/asm/syscall.h
@@ -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 */