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131 lines
3.1 KiB
131 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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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* 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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extern const unsigned long sys_call_table[]; |
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extern const unsigned long compat_sys_call_table[]; |
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) |
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{ |
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/* |
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* Note that we are returning an int here. That means 0xffffffff, ie. |
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* 32-bit negative 1, will be interpreted as -1 on a 64-bit kernel. |
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* This is important for seccomp so that compat tasks can set r0 = -1 |
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* to reject the syscall. |
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*/ |
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if (trap_is_syscall(regs)) |
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return regs->gpr[0]; |
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else |
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return -1; |
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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_error(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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if (trap_is_scv(regs)) { |
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unsigned long error = regs->gpr[3]; |
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return IS_ERR_VALUE(error) ? error : 0; |
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} else { |
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/* |
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* If the system call failed, |
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* regs->gpr[3] contains a positive ERRORCODE. |
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*/ |
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return (regs->ccr & 0x10000000UL) ? -regs->gpr[3] : 0; |
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} |
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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 (trap_is_scv(regs)) { |
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regs->gpr[3] = (long) error ?: val; |
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} else { |
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/* |
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* In the general case it's not obvious that we must deal with |
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* CCR here, as the syscall exit path will also do that for us. |
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* However there are some places, eg. the signal code, which |
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* check ccr to decide if the value in r3 is actually an error. |
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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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} |
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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 long *args) |
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{ |
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unsigned long val, mask = -1UL; |
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unsigned int n = 6; |
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#ifdef CONFIG_COMPAT |
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if (test_tsk_thread_flag(task, TIF_32BIT)) |
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mask = 0xffffffff; |
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#endif |
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while (n--) { |
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if (n == 0) |
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val = regs->orig_gpr3; |
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else |
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val = regs->gpr[3 + n]; |
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args[n] = val & mask; |
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} |
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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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const unsigned long *args) |
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{ |
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memcpy(®s->gpr[3], args, 6 * sizeof(args[0])); |
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/* Also copy the first argument into orig_gpr3 */ |
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regs->orig_gpr3 = args[0]; |
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} |
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static inline int syscall_get_arch(struct task_struct *task) |
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{ |
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int arch; |
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if (IS_ENABLED(CONFIG_PPC64) && !test_tsk_thread_flag(task, TIF_32BIT)) |
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arch = AUDIT_ARCH_PPC64; |
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else |
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arch = AUDIT_ARCH_PPC; |
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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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