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169 lines
4.0 KiB
169 lines
4.0 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) 2008-2009 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_X86_SYSCALL_H |
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#define _ASM_X86_SYSCALL_H |
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#include <uapi/linux/audit.h> |
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#include <linux/sched.h> |
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#include <linux/err.h> |
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#include <asm/thread_info.h> /* for TS_COMPAT */ |
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#include <asm/unistd.h> |
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typedef long (*sys_call_ptr_t)(const struct pt_regs *); |
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extern const sys_call_ptr_t sys_call_table[]; |
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#if defined(CONFIG_X86_32) |
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#define ia32_sys_call_table sys_call_table |
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#endif |
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#if defined(CONFIG_IA32_EMULATION) |
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extern const sys_call_ptr_t ia32_sys_call_table[]; |
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#endif |
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#ifdef CONFIG_X86_X32_ABI |
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extern const sys_call_ptr_t x32_sys_call_table[]; |
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#endif |
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/* |
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* Only the low 32 bits of orig_ax are meaningful, so we return int. |
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* This importantly ignores the high bits on 64-bit, so comparisons |
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* sign-extend the low 32 bits. |
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*/ |
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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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return regs->orig_ax; |
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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->ax = regs->orig_ax; |
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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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unsigned long error = regs->ax; |
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#ifdef CONFIG_IA32_EMULATION |
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/* |
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* TS_COMPAT is set for 32-bit syscall entries and then |
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* remains set until we return to user mode. |
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*/ |
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if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED)) |
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/* |
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* Sign-extend the value so (int)-EFOO becomes (long)-EFOO |
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* and will match correctly in comparisons. |
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*/ |
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error = (long) (int) error; |
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#endif |
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return IS_ERR_VALUE(error) ? error : 0; |
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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->ax; |
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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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regs->ax = (long) error ?: val; |
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} |
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#ifdef CONFIG_X86_32 |
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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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memcpy(args, ®s->bx, 6 * 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->bx + i, args, n * sizeof(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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return AUDIT_ARCH_I386; |
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} |
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#else /* CONFIG_X86_64 */ |
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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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# ifdef CONFIG_IA32_EMULATION |
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if (task->thread_info.status & TS_COMPAT) { |
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*args++ = regs->bx; |
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*args++ = regs->cx; |
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*args++ = regs->dx; |
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*args++ = regs->si; |
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*args++ = regs->di; |
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*args = regs->bp; |
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} else |
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# endif |
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{ |
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*args++ = regs->di; |
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*args++ = regs->si; |
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*args++ = regs->dx; |
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*args++ = regs->r10; |
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*args++ = regs->r8; |
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*args = regs->r9; |
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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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# ifdef CONFIG_IA32_EMULATION |
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if (task->thread_info.status & TS_COMPAT) { |
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regs->bx = *args++; |
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regs->cx = *args++; |
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regs->dx = *args++; |
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regs->si = *args++; |
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regs->di = *args++; |
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regs->bp = *args; |
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} else |
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# endif |
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{ |
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regs->di = *args++; |
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regs->si = *args++; |
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regs->dx = *args++; |
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regs->r10 = *args++; |
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regs->r8 = *args++; |
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regs->r9 = *args; |
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} |
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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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/* x32 tasks should be considered AUDIT_ARCH_X86_64. */ |
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return (IS_ENABLED(CONFIG_IA32_EMULATION) && |
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task->thread_info.status & TS_COMPAT) |
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? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64; |
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} |
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void do_syscall_64(unsigned long nr, struct pt_regs *regs); |
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void do_int80_syscall_32(struct pt_regs *regs); |
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long do_fast_syscall_32(struct pt_regs *regs); |
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#endif /* CONFIG_X86_32 */ |
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#endif /* _ASM_X86_SYSCALL_H */
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