parisc: Add ARCH_TRACEHOOK and regset support
By adding TRACEHOOK support we now get a clean user interface to access registers via PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS. The user-visible regset struct user_regs_struct and user_fp_struct are modelled similiar to x86 and can be accessed via PTRACE_GETREGSET. Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
Родитель
d2ad824f4b
Коммит
64e2a42bca
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@ -32,6 +32,7 @@ config PARISC
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select HAVE_DEBUG_STACKOVERFLOW
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ARCH_TRACEHOOK
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select ARCH_NO_COHERENT_DMA_MMAP
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select CPU_NO_EFFICIENT_FFS
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@ -13,6 +13,11 @@
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* N.B. gdb/strace care about the size and offsets within this
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* structure. If you change things, you may break object compatibility
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* for those applications.
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*
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* Please do NOT use this structure for future programs, but use
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* user_regs_struct (see below) instead.
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*
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* It can be accessed through PTRACE_PEEKUSR/PTRACE_POKEUSR only.
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*/
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struct pt_regs {
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@ -33,6 +38,45 @@ struct pt_regs {
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unsigned long ipsw; /* CR22 */
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};
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/**
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* struct user_regs_struct - User general purpose registers
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*
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* This is the user-visible general purpose register state structure
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* which is used to define the elf_gregset_t.
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*
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* It can be accessed through PTRACE_GETREGSET with NT_PRSTATUS
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* and through PTRACE_GETREGS.
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*/
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struct user_regs_struct {
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unsigned long gr[32]; /* PSW is in gr[0] */
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unsigned long sr[8];
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unsigned long iaoq[2];
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unsigned long iasq[2];
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unsigned long sar; /* CR11 */
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unsigned long iir; /* CR19 */
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unsigned long isr; /* CR20 */
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unsigned long ior; /* CR21 */
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unsigned long ipsw; /* CR22 */
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unsigned long cr0;
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unsigned long cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
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unsigned long cr8, cr9, cr12, cr13, cr10, cr15;
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unsigned long _pad[80-64]; /* pad to ELF_NGREG (80) */
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};
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/**
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* struct user_fp_struct - User floating point registers
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*
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* This is the user-visible floating point register state structure.
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* It uses the same layout and size as elf_fpregset_t.
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*
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* It can be accessed through PTRACE_GETREGSET with NT_PRFPREG
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* and through PTRACE_GETFPREGS.
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*/
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struct user_fp_struct {
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__u64 fr[32];
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};
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/*
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* The numbers chosen here are somewhat arbitrary but absolutely MUST
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* not overlap with any of the number assigned in <linux/ptrace.h>.
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@ -43,5 +87,9 @@ struct pt_regs {
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*/
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#define PTRACE_SINGLEBLOCK 12 /* resume execution until next branch */
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#define PTRACE_GETREGS 18
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#define PTRACE_SETREGS 19
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#define PTRACE_GETFPREGS 14
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#define PTRACE_SETFPREGS 15
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#endif /* _UAPI_PARISC_PTRACE_H */
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@ -4,18 +4,20 @@
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* Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
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* Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
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* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
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* Copyright (C) 2008 Helge Deller <deller@gmx.de>
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* Copyright (C) 2008-2016 Helge Deller <deller@gmx.de>
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/user.h>
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#include <linux/personality.h>
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#include <linux/regset.h>
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#include <linux/security.h>
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#include <linux/seccomp.h>
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#include <linux/compat.h>
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@ -33,6 +35,14 @@
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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/*
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* These are our native regset flavors.
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*/
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enum parisc_regset {
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REGSET_GENERAL,
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REGSET_FP
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};
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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@ -117,6 +127,7 @@ void user_enable_block_step(struct task_struct *task)
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long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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{
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unsigned long __user *datap = (unsigned long __user *)data;
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unsigned long tmp;
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long ret = -EIO;
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@ -129,7 +140,7 @@ long arch_ptrace(struct task_struct *child, long request,
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addr >= sizeof(struct pt_regs))
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break;
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tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
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ret = put_user(tmp, (unsigned long __user *) data);
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ret = put_user(tmp, datap);
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break;
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/* Write the word at location addr in the USER area. This will need
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@ -168,6 +179,34 @@ long arch_ptrace(struct task_struct *child, long request,
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}
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break;
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case PTRACE_GETREGS: /* Get all gp regs from the child. */
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return copy_regset_to_user(child,
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task_user_regset_view(current),
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REGSET_GENERAL,
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0, sizeof(struct user_regs_struct),
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datap);
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case PTRACE_SETREGS: /* Set all gp regs in the child. */
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return copy_regset_from_user(child,
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task_user_regset_view(current),
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REGSET_GENERAL,
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0, sizeof(struct user_regs_struct),
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datap);
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case PTRACE_GETFPREGS: /* Get the child FPU state. */
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return copy_regset_to_user(child,
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task_user_regset_view(current),
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REGSET_FP,
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0, sizeof(struct user_fp_struct),
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datap);
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case PTRACE_SETFPREGS: /* Set the child FPU state. */
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return copy_regset_from_user(child,
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task_user_regset_view(current),
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REGSET_FP,
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0, sizeof(struct user_fp_struct),
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datap);
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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@ -326,3 +365,316 @@ void do_syscall_trace_exit(struct pt_regs *regs)
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if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, stepping);
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}
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/*
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* regset functions.
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*/
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static int fpr_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct pt_regs *regs = task_regs(target);
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__u64 *k = kbuf;
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__u64 __user *u = ubuf;
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__u64 reg;
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf)
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for (; count > 0 && pos < ELF_NFPREG; --count)
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*k++ = regs->fr[pos++];
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else
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for (; count > 0 && pos < ELF_NFPREG; --count)
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if (__put_user(regs->fr[pos++], u++))
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return -EFAULT;
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kbuf = k;
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ubuf = u;
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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ELF_NFPREG * sizeof(reg), -1);
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}
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static int fpr_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_regs(target);
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const __u64 *k = kbuf;
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const __u64 __user *u = ubuf;
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__u64 reg;
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf)
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for (; count > 0 && pos < ELF_NFPREG; --count)
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regs->fr[pos++] = *k++;
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else
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for (; count > 0 && pos < ELF_NFPREG; --count) {
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if (__get_user(reg, u++))
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return -EFAULT;
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regs->fr[pos++] = reg;
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}
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kbuf = k;
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ubuf = u;
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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ELF_NFPREG * sizeof(reg), -1);
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}
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#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
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static unsigned long get_reg(struct pt_regs *regs, int num)
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{
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switch (num) {
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case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])];
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case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
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case RI(iasq[0]): return regs->iasq[0];
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case RI(iasq[1]): return regs->iasq[1];
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case RI(iaoq[0]): return regs->iaoq[0];
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case RI(iaoq[1]): return regs->iaoq[1];
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case RI(sar): return regs->sar;
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case RI(iir): return regs->iir;
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case RI(isr): return regs->isr;
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case RI(ior): return regs->ior;
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case RI(ipsw): return regs->ipsw;
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case RI(cr27): return regs->cr27;
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case RI(cr0): return mfctl(0);
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case RI(cr24): return mfctl(24);
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case RI(cr25): return mfctl(25);
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case RI(cr26): return mfctl(26);
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case RI(cr28): return mfctl(28);
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case RI(cr29): return mfctl(29);
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case RI(cr30): return mfctl(30);
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case RI(cr31): return mfctl(31);
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case RI(cr8): return mfctl(8);
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case RI(cr9): return mfctl(9);
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case RI(cr12): return mfctl(12);
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case RI(cr13): return mfctl(13);
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case RI(cr10): return mfctl(10);
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case RI(cr15): return mfctl(15);
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default: return 0;
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}
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}
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static void set_reg(struct pt_regs *regs, int num, unsigned long val)
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{
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switch (num) {
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case RI(gr[0]): /*
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* PSW is in gr[0].
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* Allow writing to Nullify, Divide-step-correction,
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* and carry/borrow bits.
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* BEWARE, if you set N, and then single step, it won't
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* stop on the nullified instruction.
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*/
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val &= USER_PSW_BITS;
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regs->gr[0] &= ~USER_PSW_BITS;
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regs->gr[0] |= val;
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return;
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case RI(gr[1]) ... RI(gr[31]):
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regs->gr[num - RI(gr[0])] = val;
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return;
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case RI(iaoq[0]):
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case RI(iaoq[1]):
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regs->iaoq[num - RI(iaoq[0])] = val;
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return;
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case RI(sar): regs->sar = val;
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return;
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default: return;
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#if 0
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/* do not allow to change any of the following registers (yet) */
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case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
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case RI(iasq[0]): return regs->iasq[0];
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case RI(iasq[1]): return regs->iasq[1];
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case RI(iir): return regs->iir;
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case RI(isr): return regs->isr;
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case RI(ior): return regs->ior;
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case RI(ipsw): return regs->ipsw;
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case RI(cr27): return regs->cr27;
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case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
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case cr8, cr9, cr12, cr13, cr10, cr15;
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#endif
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}
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}
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static int gpr_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct pt_regs *regs = task_regs(target);
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unsigned long *k = kbuf;
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unsigned long __user *u = ubuf;
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unsigned long reg;
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf)
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for (; count > 0 && pos < ELF_NGREG; --count)
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*k++ = get_reg(regs, pos++);
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else
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for (; count > 0 && pos < ELF_NGREG; --count)
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if (__put_user(get_reg(regs, pos++), u++))
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return -EFAULT;
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kbuf = k;
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ubuf = u;
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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ELF_NGREG * sizeof(reg), -1);
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}
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static int gpr_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_regs(target);
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const unsigned long *k = kbuf;
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const unsigned long __user *u = ubuf;
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unsigned long reg;
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf)
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for (; count > 0 && pos < ELF_NGREG; --count)
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set_reg(regs, pos++, *k++);
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else
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for (; count > 0 && pos < ELF_NGREG; --count) {
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if (__get_user(reg, u++))
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return -EFAULT;
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set_reg(regs, pos++, reg);
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}
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kbuf = k;
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ubuf = u;
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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ELF_NGREG * sizeof(reg), -1);
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}
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static const struct user_regset native_regsets[] = {
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
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.size = sizeof(long), .align = sizeof(long),
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.get = gpr_get, .set = gpr_set
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},
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[REGSET_FP] = {
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.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
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.size = sizeof(__u64), .align = sizeof(__u64),
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.get = fpr_get, .set = fpr_set
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}
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};
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static const struct user_regset_view user_parisc_native_view = {
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.name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
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.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
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};
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#ifdef CONFIG_64BIT
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#include <linux/compat.h>
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static int gpr32_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct pt_regs *regs = task_regs(target);
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compat_ulong_t *k = kbuf;
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compat_ulong_t __user *u = ubuf;
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compat_ulong_t reg;
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf)
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for (; count > 0 && pos < ELF_NGREG; --count)
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*k++ = get_reg(regs, pos++);
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else
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for (; count > 0 && pos < ELF_NGREG; --count)
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if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++))
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return -EFAULT;
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kbuf = k;
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ubuf = u;
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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ELF_NGREG * sizeof(reg), -1);
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}
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static int gpr32_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_regs(target);
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const compat_ulong_t *k = kbuf;
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const compat_ulong_t __user *u = ubuf;
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compat_ulong_t reg;
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf)
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for (; count > 0 && pos < ELF_NGREG; --count)
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set_reg(regs, pos++, *k++);
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else
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for (; count > 0 && pos < ELF_NGREG; --count) {
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if (__get_user(reg, u++))
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return -EFAULT;
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set_reg(regs, pos++, reg);
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}
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kbuf = k;
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ubuf = u;
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
||||
ELF_NGREG * sizeof(reg), -1);
|
||||
}
|
||||
|
||||
/*
|
||||
* These are the regset flavors matching the 32bit native set.
|
||||
*/
|
||||
static const struct user_regset compat_regsets[] = {
|
||||
[REGSET_GENERAL] = {
|
||||
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
|
||||
.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
|
||||
.get = gpr32_get, .set = gpr32_set
|
||||
},
|
||||
[REGSET_FP] = {
|
||||
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
|
||||
.size = sizeof(__u64), .align = sizeof(__u64),
|
||||
.get = fpr_get, .set = fpr_set
|
||||
}
|
||||
};
|
||||
|
||||
static const struct user_regset_view user_parisc_compat_view = {
|
||||
.name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
|
||||
.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
|
||||
};
|
||||
#endif /* CONFIG_64BIT */
|
||||
|
||||
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
||||
{
|
||||
BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
|
||||
BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
|
||||
#ifdef CONFIG_64BIT
|
||||
if (is_compat_task())
|
||||
return &user_parisc_compat_view;
|
||||
#endif
|
||||
return &user_parisc_native_view;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1234,6 +1234,10 @@ TEST_F(TRACE_poke, getpid_runs_normally)
|
|||
# define ARCH_REGS struct user_pt_regs
|
||||
# define SYSCALL_NUM regs[8]
|
||||
# define SYSCALL_RET regs[0]
|
||||
#elif defined(__hppa__)
|
||||
# define ARCH_REGS struct user_regs_struct
|
||||
# define SYSCALL_NUM gr[20]
|
||||
# define SYSCALL_RET gr[28]
|
||||
#elif defined(__powerpc__)
|
||||
# define ARCH_REGS struct pt_regs
|
||||
# define SYSCALL_NUM gpr[0]
|
||||
|
|
@ -1303,7 +1307,7 @@ void change_syscall(struct __test_metadata *_metadata,
|
|||
EXPECT_EQ(0, ret);
|
||||
|
||||
#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
|
||||
defined(__s390__)
|
||||
defined(__s390__) || defined(__hppa__)
|
||||
{
|
||||
regs.SYSCALL_NUM = syscall;
|
||||
}
|
||||
|
|
@ -1505,6 +1509,8 @@ TEST_F(TRACE_syscall, syscall_dropped)
|
|||
# define __NR_seccomp 383
|
||||
# elif defined(__aarch64__)
|
||||
# define __NR_seccomp 277
|
||||
# elif defined(__hppa__)
|
||||
# define __NR_seccomp 338
|
||||
# elif defined(__powerpc__)
|
||||
# define __NR_seccomp 358
|
||||
# elif defined(__s390__)
|
||||
|
|
|
|||
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