2923e6d503
syscall_get_error() is unused, and never has been. It's also probably wrong, as it negates r3 before returning it, but that depends on what the caller is expecting. It also doesn't deal with compat, and doesn't deal with TIF_NOERROR. Although we could fix those, until it has a caller and it's clear what semantics the caller wants it's just untested code. So drop it. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Kees Cook <keescook@chromium.org>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* Access to user system call parameters and results
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*
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* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_SYSCALL_H
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#define _ASM_SYSCALL_H 1
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#include <uapi/linux/audit.h>
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#include <linux/sched.h>
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#include <linux/thread_info.h>
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/* ftrace syscalls requires exporting the sys_call_table */
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#ifdef CONFIG_FTRACE_SYSCALLS
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extern const unsigned long sys_call_table[];
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#endif /* CONFIG_FTRACE_SYSCALLS */
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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regs->gpr[3] = regs->orig_gpr3;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->gpr[3];
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error) {
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regs->ccr |= 0x10000000L;
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regs->gpr[3] = -error;
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} else {
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regs->ccr &= ~0x10000000L;
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regs->gpr[3] = val;
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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#ifdef CONFIG_PPC64
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if (test_tsk_thread_flag(task, TIF_32BIT)) {
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/*
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* Zero-extend 32-bit argument values. The high bits are
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* garbage ignored by the actual syscall dispatch.
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*/
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while (n-- > 0)
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args[n] = (u32) regs->gpr[3 + i + n];
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return;
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}
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#endif
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memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0]));
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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BUG_ON(i + n > 6);
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memcpy(®s->gpr[3 + i], args, n * sizeof(args[0]));
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}
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static inline int syscall_get_arch(void)
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{
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int arch = is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
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#ifdef __LITTLE_ENDIAN__
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arch |= __AUDIT_ARCH_LE;
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#endif
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return arch;
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}
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#endif /* _ASM_SYSCALL_H */
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