4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
13 * SPDX-License-Identifier: GPL-2.0+
16 #ifndef __ASM_OPENRISC_PTRACE_H
17 #define __ASM_OPENRISC_PTRACE_H
19 #include <asm/spr-defs.h>
23 * This is the layout of the regset returned by the GETREGSET ptrace call
25 struct user_regs_struct {
27 unsigned long gpr[32];
38 * Make kernel PTrace/register structures opaque to userspace... userspace can
39 * access thread state via the regset mechanism. This allows us a bit of
40 * flexibility in how we order the registers on the stack, permitting some
41 * optimizations like packing call-clobbered registers together so that
42 * they share a cacheline (not done yet, though... future optimization).
47 * This struct describes how the registers are laid out on the kernel stack
48 * during a syscall or other kernel entry.
50 * This structure should always be cacheline aligned on the stack.
51 * FIXME: I don't think that's the case right now. The alignment is
52 * taken care of elsewhere... head.S, process.c, etc.
59 long sr; /* Stored in place of r0 */
73 long orig_gpr11; /* For restarting system calls */
74 long syscallno; /* Syscall number (used by strace) */
75 long dummy; /* Cheap alignment fix */
77 #endif /* __ASSEMBLY__ */
79 /* TODO: Rename this to REDZONE because that's what it is */
80 #define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */
82 #define instruction_pointer(regs) ((regs)->pc)
83 #define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0)
84 #define user_stack_pointer(regs) ((unsigned long)(regs)->sp)
85 #define profile_pc(regs) instruction_pointer(regs)
88 * Offsets used by 'ptrace' system call interface.
123 #define PT_ORIG_GPR11 132
124 #define PT_SYSCALLNO 136
126 #endif /* __KERNEL__ */
128 #endif /* __ASM_OPENRISC_PTRACE_H */