6cbe5e9526
The pt_regs struct had both a 'syscallno' field and an 'orig_gpr11' field and it wasn't really clear how these were supposed to be used. This patch removes the syscallno field altogether and makes orig_gpr11 work more like other architectures: keep track of syscall number in progress or hold -1 for non-syscall exceptions. Signed-off-by: Jonas Bonn <jonas@southpole.se>
141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/*
|
|
* OpenRISC Linux
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* OpenRISC implementation:
|
|
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
|
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
|
* et al.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef __ASM_OPENRISC_PTRACE_H
|
|
#define __ASM_OPENRISC_PTRACE_H
|
|
|
|
#include <asm/spr_defs.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
|
* This is the layout of the regset returned by the GETREGSET ptrace call
|
|
*/
|
|
struct user_regs_struct {
|
|
/* GPR R0-R31... */
|
|
unsigned long gpr[32];
|
|
unsigned long pc;
|
|
unsigned long sr;
|
|
unsigned long pad1;
|
|
unsigned long pad2;
|
|
};
|
|
#endif
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/*
|
|
* Make kernel PTrace/register structures opaque to userspace... userspace can
|
|
* access thread state via the regset mechanism. This allows us a bit of
|
|
* flexibility in how we order the registers on the stack, permitting some
|
|
* optimizations like packing call-clobbered registers together so that
|
|
* they share a cacheline (not done yet, though... future optimization).
|
|
*/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
|
* This struct describes how the registers are laid out on the kernel stack
|
|
* during a syscall or other kernel entry.
|
|
*
|
|
* This structure should always be cacheline aligned on the stack.
|
|
* FIXME: I don't think that's the case right now. The alignment is
|
|
* taken care of elsewhere... head.S, process.c, etc.
|
|
*/
|
|
|
|
struct pt_regs {
|
|
union {
|
|
struct {
|
|
/* Named registers */
|
|
long sr; /* Stored in place of r0 */
|
|
long sp; /* r1 */
|
|
};
|
|
struct {
|
|
/* Old style */
|
|
long offset[2];
|
|
long gprs[30];
|
|
};
|
|
struct {
|
|
/* New style */
|
|
long gpr[32];
|
|
};
|
|
};
|
|
long pc;
|
|
/* For restarting system calls:
|
|
* Set to syscall number for syscall exceptions,
|
|
* -1 for all other exceptions.
|
|
*/
|
|
long orig_gpr11; /* For restarting system calls */
|
|
long dummy; /* Cheap alignment fix */
|
|
long dummy2; /* Cheap alignment fix */
|
|
};
|
|
|
|
/* TODO: Rename this to REDZONE because that's what it is */
|
|
#define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */
|
|
|
|
#define instruction_pointer(regs) ((regs)->pc)
|
|
#define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0)
|
|
#define user_stack_pointer(regs) ((unsigned long)(regs)->sp)
|
|
#define profile_pc(regs) instruction_pointer(regs)
|
|
|
|
static inline long regs_return_value(struct pt_regs *regs)
|
|
{
|
|
return regs->gpr[11];
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
/*
|
|
* Offsets used by 'ptrace' system call interface.
|
|
*/
|
|
#define PT_SR 0
|
|
#define PT_SP 4
|
|
#define PT_GPR2 8
|
|
#define PT_GPR3 12
|
|
#define PT_GPR4 16
|
|
#define PT_GPR5 20
|
|
#define PT_GPR6 24
|
|
#define PT_GPR7 28
|
|
#define PT_GPR8 32
|
|
#define PT_GPR9 36
|
|
#define PT_GPR10 40
|
|
#define PT_GPR11 44
|
|
#define PT_GPR12 48
|
|
#define PT_GPR13 52
|
|
#define PT_GPR14 56
|
|
#define PT_GPR15 60
|
|
#define PT_GPR16 64
|
|
#define PT_GPR17 68
|
|
#define PT_GPR18 72
|
|
#define PT_GPR19 76
|
|
#define PT_GPR20 80
|
|
#define PT_GPR21 84
|
|
#define PT_GPR22 88
|
|
#define PT_GPR23 92
|
|
#define PT_GPR24 96
|
|
#define PT_GPR25 100
|
|
#define PT_GPR26 104
|
|
#define PT_GPR27 108
|
|
#define PT_GPR28 112
|
|
#define PT_GPR29 116
|
|
#define PT_GPR30 120
|
|
#define PT_GPR31 124
|
|
#define PT_PC 128
|
|
#define PT_ORIG_GPR11 132
|
|
#define PT_SYSCALLNO 136
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASM_OPENRISC_PTRACE_H */
|