Messages in this thread Patch in this message | | | Subject | [PATCH] mn10300 syscall.h | From | Mark Salter <> | Date | Fri, 11 Sep 2009 13:46:18 -0400 |
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This adds missing asm/syscall.h to mn10300 arch.
Signed-off-by: Mark Salter <msalter@redhat.com>
diff --git a/arch/mn10300/include/asm/syscall.h b/arch/mn10300/include/asm/syscall.h new file mode 100644 index 0000000..cc5a1f1 --- /dev/null +++ b/arch/mn10300/include/asm/syscall.h @@ -0,0 +1,131 @@ +/* syscall parameter access functions + * + * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved. + * Written by Mark Salter <msalter@redhat.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _ASM_SYSCALL_H +#define _ASM_SYSCALL_H + +#include <linux/err.h> +#include <asm/ptrace.h> + +/* + * Get the system call number or -1 + */ +static inline long syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->orig_d0; +} + +/* + * Restore the clobbered d0 register + */ +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + regs->d0 = regs->orig_d0; +} + +/* + * See if the syscall return value is an error, returning it if it is and 0 if + * not + */ +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + return IS_ERR_VALUE(regs->d0) ? regs->d0 : 0; +} + +/* + * Get the syscall return value + */ +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->d0; +} + +/* + * Set the syscall return value + */ +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + regs->d0 = (long) error ?: val; +} + +/* + * Retrieve the system call arguments + */ +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + /* + * Do this simply for now. If we need to start supporting + * fetching arguments from arbitrary indices, this will need some + * extra logic. Presently there are no in-tree users that depend + * on this behaviour. + */ + BUG_ON(i); + + /* Argument pattern is: a0, d1, a3, a2, d3, d2 */ + switch (n) { + case 6: + args[5] = regs->d2; + case 5: + args[4] = regs->d3; + case 4: + args[3] = regs->a2; + case 3: + args[2] = regs->a3; + case 2: + args[1] = regs->d1; + case 1: + args[0] = regs->a0; + break; + default: + BUG(); + } +} + +/* + * Alter the system call arguments + */ +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + const unsigned long *args) +{ + /* Same note as above applies */ + BUG_ON(i); + + switch (n) { + case 6: + regs->d2 = args[5]; + case 5: + regs->d3 = args[4]; + case 4: + regs->a2 = args[3]; + case 3: + regs->a3 = args[2]; + case 2: + regs->d1 = args[1]; + case 1: + regs->a0 = args[0]; + break; + default: + BUG(); + } +} + +#endif /* _ASM_SYSCALL_H */
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