cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ptrace.h (3201B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * OpenRISC Linux
      4 *
      5 * Linux architectural port borrowing liberally from similar works of
      6 * others.  All original copyrights apply as per the original source
      7 * declaration.
      8 *
      9 * OpenRISC implementation:
     10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
     11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
     12 * et al.
     13 */
     14#ifndef __ASM_OPENRISC_PTRACE_H
     15#define __ASM_OPENRISC_PTRACE_H
     16
     17
     18#include <asm/spr_defs.h>
     19#include <uapi/asm/ptrace.h>
     20
     21/*
     22 * Make kernel PTrace/register structures opaque to userspace... userspace can
     23 * access thread state via the regset mechanism.  This allows us a bit of
     24 * flexibility in how we order the registers on the stack, permitting some
     25 * optimizations like packing call-clobbered registers together so that
     26 * they share a cacheline (not done yet, though... future optimization).
     27 */
     28
     29#ifndef __ASSEMBLY__
     30/*
     31 * This struct describes how the registers are laid out on the kernel stack
     32 * during a syscall or other kernel entry.
     33 *
     34 * This structure should always be cacheline aligned on the stack.
     35 * FIXME: I don't think that's the case right now.  The alignment is
     36 * taken care of elsewhere... head.S, process.c, etc.
     37 */
     38
     39struct pt_regs {
     40	union {
     41		struct {
     42			/* Named registers */
     43			long  sr;	/* Stored in place of r0 */
     44			long  sp;	/* r1 */
     45		};
     46		struct {
     47			/* Old style */
     48			long offset[2];
     49			long gprs[30];
     50		};
     51		struct {
     52			/* New style */
     53			long gpr[32];
     54		};
     55	};
     56	long  pc;
     57	/* For restarting system calls:
     58	 * Set to syscall number for syscall exceptions,
     59	 * -1 for all other exceptions.
     60	 */
     61	long  orig_gpr11;	/* For restarting system calls */
     62	long dummy;		/* Cheap alignment fix */
     63	long dummy2;		/* Cheap alignment fix */
     64};
     65
     66/* TODO: Rename this to REDZONE because that's what it is */
     67#define STACK_FRAME_OVERHEAD  128  /* size of minimum stack frame */
     68
     69#define instruction_pointer(regs)	((regs)->pc)
     70#define user_mode(regs)			(((regs)->sr & SPR_SR_SM) == 0)
     71#define user_stack_pointer(regs)	((unsigned long)(regs)->sp)
     72#define profile_pc(regs)		instruction_pointer(regs)
     73
     74static inline long regs_return_value(struct pt_regs *regs)
     75{
     76	return regs->gpr[11];
     77}
     78
     79#endif /* __ASSEMBLY__ */
     80
     81/*
     82 * Offsets used by 'ptrace' system call interface.
     83 */
     84#define PT_SR         0
     85#define PT_SP         4
     86#define PT_GPR2       8
     87#define PT_GPR3       12
     88#define PT_GPR4       16
     89#define PT_GPR5       20
     90#define PT_GPR6       24
     91#define PT_GPR7       28
     92#define PT_GPR8       32
     93#define PT_GPR9       36
     94#define PT_GPR10      40
     95#define PT_GPR11      44
     96#define PT_GPR12      48
     97#define PT_GPR13      52
     98#define PT_GPR14      56
     99#define PT_GPR15      60
    100#define PT_GPR16      64
    101#define PT_GPR17      68
    102#define PT_GPR18      72
    103#define PT_GPR19      76
    104#define PT_GPR20      80
    105#define PT_GPR21      84
    106#define PT_GPR22      88
    107#define PT_GPR23      92
    108#define PT_GPR24      96
    109#define PT_GPR25      100
    110#define PT_GPR26      104
    111#define PT_GPR27      108
    112#define PT_GPR28      112
    113#define PT_GPR29      116
    114#define PT_GPR30      120
    115#define PT_GPR31      124
    116#define PT_PC	      128
    117#define PT_ORIG_GPR11 132
    118#define PT_SYSCALLNO  136
    119
    120#endif /* __ASM_OPENRISC_PTRACE_H */