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/* * Access to user system call parameters and results * * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License v.2. * * See asm-generic/syscall.h for descriptions of what we must do here. */ #ifndef _ASM_X86_SYSCALL_H #define _ASM_X86_SYSCALL_H #include <linux/sched.h> #include <linux/err.h> #include <asm/asm-offsets.h> /* For NR_syscalls */ extern const unsigned long sys_call_table[]; /* * Only the low 32 bits of orig_ax are meaningful, so we return int. * This importantly ignores the high bits on 64-bit, so comparisons * sign-extend the low 32 bits. */ static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { return regs->orig_ax; } static inline void syscall_rollback(struct task_struct *task, struct pt_regs *regs) { regs->ax = regs->orig_ax; } static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { unsigned long error = regs->ax; #ifdef CONFIG_IA32_EMULATION /* * TS_COMPAT is set for 32-bit syscall entries and then * remains set until we return to user mode. */ if (task_thread_info(task)->status & TS_COMPAT) /* * Sign-extend the value so (int)-EFOO becomes (long)-EFOO * and will match correctly in comparisons. */ error = (long) (int) error; #endif return IS_ERR_VALUE(error) ? error : 0; } static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { return regs->ax; } static inline void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, int error, long val) { regs->ax = (long) error ?: val; } #ifdef CONFIG_X86_32 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); memcpy(args, ®s->bx + 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); memcpy(®s->bx + i, args, n * sizeof(args[0])); } #else /* CONFIG_X86_64 */ static inline void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, unsigned long *args) { # ifdef CONFIG_IA32_EMULATION if (task_thread_info(task)->status & TS_COMPAT) switch (i) { case 0: if (!n--) break; *args++ = regs->bx; case 1: if (!n--) break; *args++ = regs->cx; case 2: if (!n--) break; *args++ = regs->dx; case 3: if (!n--) break; *args++ = regs->si; case 4: if (!n--) break; *args++ = regs->di; case 5: if (!n--) break; *args++ = regs->bp; case 6: if (!n--) break; default: BUG(); break; } else # endif switch (i) { case 0: if (!n--) break; *args++ = regs->di; case 1: if (!n--) break; *args++ = regs->si; case 2: if (!n--) break; *args++ = regs->dx; case 3: if (!n--) break; *args++ = regs->r10; case 4: if (!n--) break; *args++ = regs->r8; case 5: if (!n--) break; *args++ = regs->r9; case 6: if (!n--) break; default: BUG(); break; } } static inline void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, const unsigned long *args) { # ifdef CONFIG_IA32_EMULATION if (task_thread_info(task)->status & TS_COMPAT) switch (i) { case 0: if (!n--) break; regs->bx = *args++; case 1: if (!n--) break; regs->cx = *args++; case 2: if (!n--) break; regs->dx = *args++; case 3: if (!n--) break; regs->si = *args++; case 4: if (!n--) break; regs->di = *args++; case 5: if (!n--) break; regs->bp = *args++; case 6: if (!n--) break; default: BUG(); break; } else # endif switch (i) { case 0: if (!n--) break; regs->di = *args++; case 1: if (!n--) break; regs->si = *args++; case 2: if (!n--) break; regs->dx = *args++; case 3: if (!n--) break; regs->r10 = *args++; case 4: if (!n--) break; regs->r8 = *args++; case 5: if (!n--) break; regs->r9 = *args++; case 6: if (!n--) break; default: BUG(); break; } } #endif /* CONFIG_X86_32 */ #endif /* _ASM_X86_SYSCALL_H */
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