fd0c153daa
If we use the ancient SysV syscall ABI, we'd better have tell the
kernel how to claim that a negative return value is a success.
Use ->orig_r2 for that - it's inaccessible via ptrace, so it's
a fair game for changes and it's normally[*] non-negative on return
from syscall. Set to -1; syscall is not going to be restart-worthy
by definition, so we won't interfere with that use either.
[*] the only exception is rt_sigreturn(), where we skip the entire
messing with r1/r2 anyway.
Fixes: 82ed08dd1b ("nios2: Exception handling")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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* Copyright (C) 2013 Altera Corporation
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* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2004 Microtronix Datacom Ltd
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*
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* based on m68k asm/processor.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_NIOS2_PTRACE_H
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#define _ASM_NIOS2_PTRACE_H
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#include <uapi/asm/ptrace.h>
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/* This struct defines the way the registers are stored on the
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stack during a system call. */
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#ifndef __ASSEMBLY__
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struct pt_regs {
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unsigned long r8; /* r8-r15 Caller-saved GP registers */
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unsigned long r9;
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unsigned long r10;
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unsigned long r11;
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unsigned long r12;
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unsigned long r13;
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unsigned long r14;
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unsigned long r15;
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unsigned long r1; /* Assembler temporary */
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unsigned long r2; /* Retval LS 32bits */
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unsigned long r3; /* Retval MS 32bits */
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unsigned long r4; /* r4-r7 Register arguments */
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unsigned long r5;
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unsigned long r6;
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unsigned long r7;
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unsigned long orig_r2; /* Copy of r2 ?? */
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unsigned long ra; /* Return address */
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unsigned long fp; /* Frame pointer */
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unsigned long sp; /* Stack pointer */
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unsigned long gp; /* Global pointer */
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unsigned long estatus;
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unsigned long ea; /* Exception return address (pc) */
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unsigned long orig_r7;
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};
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/*
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* This is the extended stack used by signal handlers and the context
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* switcher: it's pushed after the normal "struct pt_regs".
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*/
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struct switch_stack {
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unsigned long r16; /* r16-r23 Callee-saved GP registers */
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unsigned long r17;
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unsigned long r18;
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unsigned long r19;
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unsigned long r20;
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unsigned long r21;
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unsigned long r22;
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unsigned long r23;
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unsigned long fp;
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unsigned long gp;
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unsigned long ra;
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};
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#define user_mode(regs) (((regs)->estatus & ESTATUS_EU))
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#define instruction_pointer(regs) ((regs)->ra)
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#define profile_pc(regs) instruction_pointer(regs)
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#define user_stack_pointer(regs) ((regs)->sp)
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extern void show_regs(struct pt_regs *);
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#define current_pt_regs() \
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((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE)\
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- 1)
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#define force_successful_syscall_return() (current_pt_regs()->orig_r2 = -1)
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int do_syscall_trace_enter(void);
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void do_syscall_trace_exit(void);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_NIOS2_PTRACE_H */
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