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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * 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. */ #ifndef __ASM_OPENRISC_PTRACE_H #define __ASM_OPENRISC_PTRACE_H #include <asm/spr_defs.h> #include <uapi/asm/ptrace.h> /* * 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 /* __ASM_OPENRISC_PTRACE_H */
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