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dacbe41f77
While in theory user_enable_single_step/user_disable_single_step/
user_enable_blockstep could also be provided as an inline or macro there's
no good reason to do so, and having the prototype in one places keeps code
size and confusion down.
Roland said:
The original thought there was that user_enable_single_step() et al
might well be only an instruction or three on a sane machine (as if we
have any of those!), and since there is only one call site inlining
would be beneficial. But I agree that there is no strong reason to care
about inlining it.
As to the arch changes, there is only one thought I'd add to the
record. It was always my thinking that for an arch where
PTRACE_SINGLESTEP does text-modifying breakpoint insertion,
user_enable_single_step() should not be provided. That is,
arch_has_single_step()=>true means that there is an arch facility with
"pure" semantics that does not have any unexpected side effects.
Inserting a breakpoint might do very unexpected strange things in
multi-threaded situations. Aside from that, it is a peculiar side
effect that user_{enable,disable}_single_step() should cause COW
de-sharing of text pages and so forth. For PTRACE_SINGLESTEP, all these
peculiarities are the status quo ante for that arch, so having
arch_ptrace() itself do those is one thing. But for building other
things in the future, it is nicer to have a uniform "pure" semantics
that arch-independent code can expect.
OTOH, all such arch issues are really up to the arch maintainer. As
of today, there is nothing but ptrace using user_enable_single_step() et
al so it's a distinction without a practical difference. If/when there
are other facilities that use user_enable_single_step() and might care,
the affected arch's can revisit the question when someone cares about
the quality of the arch support for said new facility.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
368 lines
11 KiB
C
368 lines
11 KiB
C
#ifndef _ASM_POWERPC_PTRACE_H
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#define _ASM_POWERPC_PTRACE_H
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/*
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* Copyright (C) 2001 PPC64 Team, IBM Corp
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*
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* This struct defines the way the registers are stored on the
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* kernel stack during a system call or other kernel entry.
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*
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* this should only contain volatile regs
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* since we can keep non-volatile in the thread_struct
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* should set this up when only volatiles are saved
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* by intr code.
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*
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* Since this is going on the stack, *CARE MUST BE TAKEN* to insure
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* that the overall structure is a multiple of 16 bytes in length.
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*
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* Note that the offsets of the fields in this struct correspond with
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* the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifdef __KERNEL__
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#include <linux/types.h>
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#else
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#include <stdint.h>
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#endif
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#ifndef __ASSEMBLY__
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struct pt_regs {
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unsigned long gpr[32];
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unsigned long nip;
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unsigned long msr;
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unsigned long orig_gpr3; /* Used for restarting system calls */
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unsigned long ctr;
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unsigned long link;
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unsigned long xer;
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unsigned long ccr;
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#ifdef __powerpc64__
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unsigned long softe; /* Soft enabled/disabled */
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#else
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unsigned long mq; /* 601 only (not used at present) */
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/* Used on APUS to hold IPL value. */
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#endif
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unsigned long trap; /* Reason for being here */
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/* N.B. for critical exceptions on 4xx, the dar and dsisr
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fields are overloaded to hold srr0 and srr1. */
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unsigned long dar; /* Fault registers */
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unsigned long dsisr; /* on 4xx/Book-E used for ESR */
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unsigned long result; /* Result of a system call */
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};
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#endif /* __ASSEMBLY__ */
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#ifdef __KERNEL__
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#ifdef __powerpc64__
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#define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
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#define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
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#define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
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#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
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STACK_FRAME_OVERHEAD + 288)
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#define STACK_FRAME_MARKER 12
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/* Size of dummy stack frame allocated when calling signal handler. */
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#define __SIGNAL_FRAMESIZE 128
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#define __SIGNAL_FRAMESIZE32 64
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#else /* __powerpc64__ */
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#define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
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#define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
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#define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
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#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
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#define STACK_FRAME_MARKER 2
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/* Size of stack frame allocated when calling signal handler. */
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#define __SIGNAL_FRAMESIZE 64
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#endif /* __powerpc64__ */
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#ifndef __ASSEMBLY__
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#define instruction_pointer(regs) ((regs)->nip)
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#define user_stack_pointer(regs) ((regs)->gpr[1])
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#define regs_return_value(regs) ((regs)->gpr[3])
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#ifdef CONFIG_SMP
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extern unsigned long profile_pc(struct pt_regs *regs);
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#else
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#define profile_pc(regs) instruction_pointer(regs)
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#endif
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#ifdef __powerpc64__
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#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
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#else
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#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
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#endif
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#define force_successful_syscall_return() \
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do { \
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set_thread_flag(TIF_NOERROR); \
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} while(0)
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struct task_struct;
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extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
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extern int ptrace_put_reg(struct task_struct *task, int regno,
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unsigned long data);
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/*
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* We use the least-significant bit of the trap field to indicate
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* whether we have saved the full set of registers, or only a
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* partial set. A 1 there means the partial set.
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* On 4xx we use the next bit to indicate whether the exception
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* is a critical exception (1 means it is).
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*/
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#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
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#ifndef __powerpc64__
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#define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
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#define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
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#define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
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#endif /* ! __powerpc64__ */
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#define TRAP(regs) ((regs)->trap & ~0xF)
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#ifdef __powerpc64__
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#define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1)
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#else
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#define CHECK_FULL_REGS(regs) \
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do { \
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if ((regs)->trap & 1) \
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printk(KERN_CRIT "%s: partial register set\n", __func__); \
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} while (0)
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#endif /* __powerpc64__ */
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#define arch_has_single_step() (1)
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#define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601))
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#define ARCH_HAS_USER_SINGLE_STEP_INFO
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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/*
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* Offsets used by 'ptrace' system call interface.
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* These can't be changed without breaking binary compatibility
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* with MkLinux, etc.
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*/
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#define PT_R0 0
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#define PT_R1 1
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#define PT_R2 2
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#define PT_R3 3
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#define PT_R4 4
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#define PT_R5 5
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#define PT_R6 6
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#define PT_R7 7
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#define PT_R8 8
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#define PT_R9 9
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#define PT_R10 10
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#define PT_R11 11
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#define PT_R12 12
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#define PT_R13 13
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#define PT_R14 14
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#define PT_R15 15
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#define PT_R16 16
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#define PT_R17 17
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#define PT_R18 18
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#define PT_R19 19
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#define PT_R20 20
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#define PT_R21 21
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#define PT_R22 22
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#define PT_R23 23
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#define PT_R24 24
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#define PT_R25 25
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#define PT_R26 26
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#define PT_R27 27
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#define PT_R28 28
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#define PT_R29 29
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#define PT_R30 30
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#define PT_R31 31
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#define PT_NIP 32
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#define PT_MSR 33
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#define PT_ORIG_R3 34
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#define PT_CTR 35
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#define PT_LNK 36
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#define PT_XER 37
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#define PT_CCR 38
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#ifndef __powerpc64__
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#define PT_MQ 39
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#else
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#define PT_SOFTE 39
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#endif
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#define PT_TRAP 40
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#define PT_DAR 41
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#define PT_DSISR 42
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#define PT_RESULT 43
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#define PT_REGS_COUNT 44
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#define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */
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#ifndef __powerpc64__
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#define PT_FPR31 (PT_FPR0 + 2*31)
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#define PT_FPSCR (PT_FPR0 + 2*32 + 1)
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#else /* __powerpc64__ */
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#define PT_FPSCR (PT_FPR0 + 32) /* each FP reg occupies 1 slot in 64-bit space */
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#ifdef __KERNEL__
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#define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
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#endif
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#define PT_VR0 82 /* each Vector reg occupies 2 slots in 64-bit */
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#define PT_VSCR (PT_VR0 + 32*2 + 1)
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#define PT_VRSAVE (PT_VR0 + 33*2)
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#ifdef __KERNEL__
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#define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
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#define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
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#define PT_VRSAVE_32 (PT_VR0 + 33*4)
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#endif
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/*
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* Only store first 32 VSRs here. The second 32 VSRs in VR0-31
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*/
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#define PT_VSR0 150 /* each VSR reg occupies 2 slots in 64-bit */
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#define PT_VSR31 (PT_VSR0 + 2*31)
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#ifdef __KERNEL__
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#define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
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#endif
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#endif /* __powerpc64__ */
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/*
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* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
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* The transfer totals 34 quadword. Quadwords 0-31 contain the
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* corresponding vector registers. Quadword 32 contains the vscr as the
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* last word (offset 12) within that quadword. Quadword 33 contains the
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* vrsave as the first word (offset 0) within the quadword.
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*
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* This definition of the VMX state is compatible with the current PPC32
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* ptrace interface. This allows signal handling and ptrace to use the same
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* structures. This also simplifies the implementation of a bi-arch
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* (combined (32- and 64-bit) gdb.
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*/
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#define PTRACE_GETVRREGS 18
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#define PTRACE_SETVRREGS 19
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/* Get/set all the upper 32-bits of the SPE registers, accumulator, and
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* spefscr, in one go */
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#define PTRACE_GETEVRREGS 20
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#define PTRACE_SETEVRREGS 21
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/* Get the first 32 128bit VSX registers */
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#define PTRACE_GETVSRREGS 27
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#define PTRACE_SETVSRREGS 28
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/*
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* Get or set a debug register. The first 16 are DABR registers and the
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* second 16 are IABR registers.
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*/
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#define PTRACE_GET_DEBUGREG 25
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#define PTRACE_SET_DEBUGREG 26
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/* (new) PTRACE requests using the same numbers as x86 and the same
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* argument ordering. Additionally, they support more registers too
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*/
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#define PTRACE_GETREGS 12
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#define PTRACE_SETREGS 13
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#define PTRACE_GETFPREGS 14
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#define PTRACE_SETFPREGS 15
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#define PTRACE_GETREGS64 22
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#define PTRACE_SETREGS64 23
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/* (old) PTRACE requests with inverted arguments */
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#define PPC_PTRACE_GETREGS 0x99 /* Get GPRs 0 - 31 */
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#define PPC_PTRACE_SETREGS 0x98 /* Set GPRs 0 - 31 */
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#define PPC_PTRACE_GETFPREGS 0x97 /* Get FPRs 0 - 31 */
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#define PPC_PTRACE_SETFPREGS 0x96 /* Set FPRs 0 - 31 */
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/* Calls to trace a 64bit program from a 32bit program */
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#define PPC_PTRACE_PEEKTEXT_3264 0x95
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#define PPC_PTRACE_PEEKDATA_3264 0x94
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#define PPC_PTRACE_POKETEXT_3264 0x93
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#define PPC_PTRACE_POKEDATA_3264 0x92
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#define PPC_PTRACE_PEEKUSR_3264 0x91
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#define PPC_PTRACE_POKEUSR_3264 0x90
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#define PTRACE_SINGLEBLOCK 0x100 /* resume execution until next branch */
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#define PPC_PTRACE_GETHWDBGINFO 0x89
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#define PPC_PTRACE_SETHWDEBUG 0x88
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#define PPC_PTRACE_DELHWDEBUG 0x87
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#ifndef __ASSEMBLY__
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struct ppc_debug_info {
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uint32_t version; /* Only version 1 exists to date */
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uint32_t num_instruction_bps;
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uint32_t num_data_bps;
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uint32_t num_condition_regs;
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uint32_t data_bp_alignment;
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uint32_t sizeof_condition; /* size of the DVC register */
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uint64_t features;
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};
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#endif /* __ASSEMBLY__ */
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/*
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* features will have bits indication whether there is support for:
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*/
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#define PPC_DEBUG_FEATURE_INSN_BP_RANGE 0x0000000000000001
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#define PPC_DEBUG_FEATURE_INSN_BP_MASK 0x0000000000000002
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#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x0000000000000004
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#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x0000000000000008
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#ifndef __ASSEMBLY__
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struct ppc_hw_breakpoint {
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uint32_t version; /* currently, version must be 1 */
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uint32_t trigger_type; /* only some combinations allowed */
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uint32_t addr_mode; /* address match mode */
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uint32_t condition_mode; /* break/watchpoint condition flags */
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uint64_t addr; /* break/watchpoint address */
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uint64_t addr2; /* range end or mask */
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uint64_t condition_value; /* contents of the DVC register */
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};
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#endif /* __ASSEMBLY__ */
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/*
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* Trigger Type
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*/
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#define PPC_BREAKPOINT_TRIGGER_EXECUTE 0x00000001
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#define PPC_BREAKPOINT_TRIGGER_READ 0x00000002
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#define PPC_BREAKPOINT_TRIGGER_WRITE 0x00000004
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#define PPC_BREAKPOINT_TRIGGER_RW \
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(PPC_BREAKPOINT_TRIGGER_READ | PPC_BREAKPOINT_TRIGGER_WRITE)
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/*
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* Address Mode
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*/
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#define PPC_BREAKPOINT_MODE_EXACT 0x00000000
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#define PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE 0x00000001
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#define PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE 0x00000002
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#define PPC_BREAKPOINT_MODE_MASK 0x00000003
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/*
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* Condition Mode
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*/
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#define PPC_BREAKPOINT_CONDITION_MODE 0x00000003
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#define PPC_BREAKPOINT_CONDITION_NONE 0x00000000
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#define PPC_BREAKPOINT_CONDITION_AND 0x00000001
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#define PPC_BREAKPOINT_CONDITION_EXACT PPC_BREAKPOINT_CONDITION_AND
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#define PPC_BREAKPOINT_CONDITION_OR 0x00000002
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#define PPC_BREAKPOINT_CONDITION_AND_OR 0x00000003
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#define PPC_BREAKPOINT_CONDITION_BE_ALL 0x00ff0000
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#define PPC_BREAKPOINT_CONDITION_BE_SHIFT 16
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#define PPC_BREAKPOINT_CONDITION_BE(n) \
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(1<<((n)+PPC_BREAKPOINT_CONDITION_BE_SHIFT))
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#endif /* _ASM_POWERPC_PTRACE_H */
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