x86: tracehook: asm/syscall.h
Add asm/syscall.h for x86 with all the required entry points. This will allow arch-independent tracing code for system calls. Signed-off-by: Roland McGrath <roland@redhat.com>hifive-unleashed-5.1
Roland McGrath
parent
eeea3c3ff8
commit
68bd0f4ef7
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@ -213,6 +213,11 @@ static inline unsigned long frame_pointer(struct pt_regs *regs)
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return regs->bp;
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}
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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return regs->sp;
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}
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/*
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* These are defined as per linux/ptrace.h, which see.
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*/
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@ -0,0 +1,210 @@
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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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* 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 <linux/sched.h>
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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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/*
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* We always sign-extend a -1 value being set here,
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* so this is always either -1L or a syscall number.
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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(task)->status & TS_COMPAT)
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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 error >= -4095L ? 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 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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memcpy(args, ®s->bx + 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->bx + i, args, n * sizeof(args[0]));
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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 int i, unsigned int n,
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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(task)->status & TS_COMPAT)
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switch (i + n) {
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case 6:
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if (!n--) break;
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*args++ = regs->bp;
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case 5:
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if (!n--) break;
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*args++ = regs->di;
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case 4:
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if (!n--) break;
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*args++ = regs->si;
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case 3:
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if (!n--) break;
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*args++ = regs->dx;
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case 2:
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if (!n--) break;
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*args++ = regs->cx;
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case 1:
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if (!n--) break;
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*args++ = regs->bx;
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case 0:
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if (!n--) break;
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default:
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BUG();
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break;
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}
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else
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# endif
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switch (i + n) {
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case 6:
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if (!n--) break;
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*args++ = regs->r9;
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case 5:
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if (!n--) break;
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*args++ = regs->r8;
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case 4:
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if (!n--) break;
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*args++ = regs->r10;
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case 3:
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if (!n--) break;
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*args++ = regs->dx;
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case 2:
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if (!n--) break;
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*args++ = regs->si;
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case 1:
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if (!n--) break;
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*args++ = regs->di;
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case 0:
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if (!n--) break;
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default:
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BUG();
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break;
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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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unsigned int i, unsigned int n,
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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(task)->status & TS_COMPAT)
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switch (i + n) {
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case 6:
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if (!n--) break;
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regs->bp = *args++;
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case 5:
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if (!n--) break;
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regs->di = *args++;
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case 4:
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if (!n--) break;
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regs->si = *args++;
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case 3:
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if (!n--) break;
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regs->dx = *args++;
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case 2:
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if (!n--) break;
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regs->cx = *args++;
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case 1:
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if (!n--) break;
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regs->bx = *args++;
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case 0:
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if (!n--) break;
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default:
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BUG();
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}
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else
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# endif
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switch (i + n) {
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case 6:
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if (!n--) break;
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regs->r9 = *args++;
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case 5:
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if (!n--) break;
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regs->r8 = *args++;
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case 4:
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if (!n--) break;
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regs->r10 = *args++;
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case 3:
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if (!n--) break;
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regs->dx = *args++;
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case 2:
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if (!n--) break;
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regs->si = *args++;
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case 1:
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if (!n--) break;
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regs->di = *args++;
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case 0:
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if (!n--) break;
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default:
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BUG();
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}
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}
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#endif /* CONFIG_X86_32 */
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#endif /* _ASM_SYSCALL_H */
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