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parisc: Add ARCH_TRACEHOOK and regset support

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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>
tirimbino
Helge Deller 9 years ago
parent d2ad824f4b
commit 64e2a42bca
4 changed files with 410 additions and 3 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 1
      arch/parisc/Kconfig
  2. 48
      arch/parisc/include/uapi/asm/ptrace.h
  3. 356
      arch/parisc/kernel/ptrace.c
  4. 8
      tools/testing/selftests/seccomp/seccomp_bpf.c

1
arch/parisc/Kconfig
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@ -32,6 +32,7 @@ config PARISC
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select ARCH_NO_COHERENT_DMA_MMAP
select CPU_NO_EFFICIENT_FFS

48
arch/parisc/include/uapi/asm/ptrace.h
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@ -13,6 +13,11 @@
* N.B. gdb/strace care about the size and offsets within this
* structure. If you change things, you may break object compatibility
* for those applications.
*
* Please do NOT use this structure for future programs, but use
* user_regs_struct (see below) instead.
*
* It can be accessed through PTRACE_PEEKUSR/PTRACE_POKEUSR only.
*/
struct pt_regs {
@ -33,6 +38,45 @@ struct pt_regs {
unsigned long ipsw; /* CR22 */
};
/**
* struct user_regs_struct - User general purpose registers
*
* This is the user-visible general purpose register state structure
* which is used to define the elf_gregset_t.
*
* It can be accessed through PTRACE_GETREGSET with NT_PRSTATUS
* and through PTRACE_GETREGS.
*/
struct user_regs_struct {
unsigned long gr[32]; /* PSW is in gr[0] */
unsigned long sr[8];
unsigned long iaoq[2];
unsigned long iasq[2];
unsigned long sar; /* CR11 */
unsigned long iir; /* CR19 */
unsigned long isr; /* CR20 */
unsigned long ior; /* CR21 */
unsigned long ipsw; /* CR22 */
unsigned long cr0;
unsigned long cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
unsigned long cr8, cr9, cr12, cr13, cr10, cr15;
unsigned long _pad[80-64]; /* pad to ELF_NGREG (80) */
};
/**
* struct user_fp_struct - User floating point registers
*
* This is the user-visible floating point register state structure.
* It uses the same layout and size as elf_fpregset_t.
*
* It can be accessed through PTRACE_GETREGSET with NT_PRFPREG
* and through PTRACE_GETFPREGS.
*/
struct user_fp_struct {
__u64 fr[32];
};
/*
* The numbers chosen here are somewhat arbitrary but absolutely MUST
* not overlap with any of the number assigned in <linux/ptrace.h>.
@ -43,5 +87,9 @@ struct pt_regs {
*/
#define PTRACE_SINGLEBLOCK 12 /* resume execution until next branch */
#define PTRACE_GETREGS 18
#define PTRACE_SETREGS 19
#define PTRACE_GETFPREGS 14
#define PTRACE_SETFPREGS 15
#endif /* _UAPI_PARISC_PTRACE_H */

356
arch/parisc/kernel/ptrace.c
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@ -4,18 +4,20 @@
* Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
* Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
* Copyright (C) 2008 Helge Deller <deller@gmx.de>
* Copyright (C) 2008-2016 Helge Deller <deller@gmx.de>
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/user.h>
#include <linux/personality.h>
#include <linux/regset.h>
#include <linux/security.h>
#include <linux/seccomp.h>
#include <linux/compat.h>
@ -33,6 +35,14 @@
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
/*
* These are our native regset flavors.
*/
enum parisc_regset {
REGSET_GENERAL,
REGSET_FP
};
/*
* Called by kernel/ptrace.c when detaching..
*
@ -117,6 +127,7 @@ void user_enable_block_step(struct task_struct *task)
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
unsigned long __user *datap = (unsigned long __user *)data;
unsigned long tmp;
long ret = -EIO;
@ -129,7 +140,7 @@ long arch_ptrace(struct task_struct *child, long request,
addr >= sizeof(struct pt_regs))
break;
tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (unsigned long __user *) data);
ret = put_user(tmp, datap);
break;
/* Write the word at location addr in the USER area. This will need
@ -168,6 +179,34 @@ long arch_ptrace(struct task_struct *child, long request,
}
break;
case PTRACE_GETREGS: /* Get all gp regs from the child. */
return copy_regset_to_user(child,
task_user_regset_view(current),
REGSET_GENERAL,
0, sizeof(struct user_regs_struct),
datap);
case PTRACE_SETREGS: /* Set all gp regs in the child. */
return copy_regset_from_user(child,
task_user_regset_view(current),
REGSET_GENERAL,
0, sizeof(struct user_regs_struct),
datap);
case PTRACE_GETFPREGS: /* Get the child FPU state. */
return copy_regset_to_user(child,
task_user_regset_view(current),
REGSET_FP,
0, sizeof(struct user_fp_struct),
datap);
case PTRACE_SETFPREGS: /* Set the child FPU state. */
return copy_regset_from_user(child,
task_user_regset_view(current),
REGSET_FP,
0, sizeof(struct user_fp_struct),
datap);
default:
ret = ptrace_request(child, request, addr, data);
break;
@ -326,3 +365,316 @@ void do_syscall_trace_exit(struct pt_regs *regs)
if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, stepping);
}
/*
* regset functions.
*/
static int fpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct pt_regs *regs = task_regs(target);
__u64 *k = kbuf;
__u64 __user *u = ubuf;
__u64 reg;
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf)
for (; count > 0 && pos < ELF_NFPREG; --count)
*k++ = regs->fr[pos++];
else
for (; count > 0 && pos < ELF_NFPREG; --count)
if (__put_user(regs->fr[pos++], u++))
return -EFAULT;
kbuf = k;
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
ELF_NFPREG * sizeof(reg), -1);
}
static int fpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_regs(target);
const __u64 *k = kbuf;
const __u64 __user *u = ubuf;
__u64 reg;
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf)
for (; count > 0 && pos < ELF_NFPREG; --count)
regs->fr[pos++] = *k++;
else
for (; count > 0 && pos < ELF_NFPREG; --count) {
if (__get_user(reg, u++))
return -EFAULT;
regs->fr[pos++] = reg;
}
kbuf = k;
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
ELF_NFPREG * sizeof(reg), -1);
}
#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
static unsigned long get_reg(struct pt_regs *regs, int num)
{
switch (num) {
case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])];
case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
case RI(iasq[0]): return regs->iasq[0];
case RI(iasq[1]): return regs->iasq[1];
case RI(iaoq[0]): return regs->iaoq[0];
case RI(iaoq[1]): return regs->iaoq[1];
case RI(sar): return regs->sar;
case RI(iir): return regs->iir;
case RI(isr): return regs->isr;
case RI(ior): return regs->ior;
case RI(ipsw): return regs->ipsw;
case RI(cr27): return regs->cr27;
case RI(cr0): return mfctl(0);
case RI(cr24): return mfctl(24);
case RI(cr25): return mfctl(25);
case RI(cr26): return mfctl(26);
case RI(cr28): return mfctl(28);
case RI(cr29): return mfctl(29);
case RI(cr30): return mfctl(30);
case RI(cr31): return mfctl(31);
case RI(cr8): return mfctl(8);
case RI(cr9): return mfctl(9);
case RI(cr12): return mfctl(12);
case RI(cr13): return mfctl(13);
case RI(cr10): return mfctl(10);
case RI(cr15): return mfctl(15);
default: return 0;
}
}
static void set_reg(struct pt_regs *regs, int num, unsigned long val)
{
switch (num) {
case RI(gr[0]): /*
* PSW is in gr[0].
* Allow writing to Nullify, Divide-step-correction,
* and carry/borrow bits.
* BEWARE, if you set N, and then single step, it won't
* stop on the nullified instruction.
*/
val &= USER_PSW_BITS;
regs->gr[0] &= ~USER_PSW_BITS;
regs->gr[0] |= val;
return;
case RI(gr[1]) ... RI(gr[31]):
regs->gr[num - RI(gr[0])] = val;
return;
case RI(iaoq[0]):
case RI(iaoq[1]):
regs->iaoq[num - RI(iaoq[0])] = val;
return;
case RI(sar): regs->sar = val;
return;
default: return;
#if 0
/* do not allow to change any of the following registers (yet) */
case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
case RI(iasq[0]): return regs->iasq[0];
case RI(iasq[1]): return regs->iasq[1];
case RI(iir): return regs->iir;
case RI(isr): return regs->isr;
case RI(ior): return regs->ior;
case RI(ipsw): return regs->ipsw;
case RI(cr27): return regs->cr27;
case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
case cr8, cr9, cr12, cr13, cr10, cr15;
#endif
}
}
static int gpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct pt_regs *regs = task_regs(target);
unsigned long *k = kbuf;
unsigned long __user *u = ubuf;
unsigned long reg;
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf)
for (; count > 0 && pos < ELF_NGREG; --count)
*k++ = get_reg(regs, pos++);
else
for (; count > 0 && pos < ELF_NGREG; --count)
if (__put_user(get_reg(regs, pos++), u++))
return -EFAULT;
kbuf = k;
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
ELF_NGREG * sizeof(reg), -1);
}
static int gpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_regs(target);
const unsigned long *k = kbuf;
const unsigned long __user *u = ubuf;
unsigned long reg;
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf)
for (; count > 0 && pos < ELF_NGREG; --count)
set_reg(regs, pos++, *k++);
else
for (; count > 0 && pos < ELF_NGREG; --count) {
if (__get_user(reg, u++))
return -EFAULT;
set_reg(regs, pos++, reg);
}
kbuf = k;
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
ELF_NGREG * sizeof(reg), -1);
}
static const struct user_regset native_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
.size = sizeof(long), .align = sizeof(long),
.get = gpr_get, .set = gpr_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_native_view = {
.name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
};
#ifdef CONFIG_64BIT
#include <linux/compat.h>
static int gpr32_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct pt_regs *regs = task_regs(target);
compat_ulong_t *k = kbuf;
compat_ulong_t __user *u = ubuf;
compat_ulong_t reg;
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf)
for (; count > 0 && pos < ELF_NGREG; --count)
*k++ = get_reg(regs, pos++);
else
for (; count > 0 && pos < ELF_NGREG; --count)
if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++))
return -EFAULT;
kbuf = k;
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
ELF_NGREG * sizeof(reg), -1);
}
static int gpr32_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_regs(target);
const compat_ulong_t *k = kbuf;
const compat_ulong_t __user *u = ubuf;
compat_ulong_t reg;
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf)
for (; count > 0 && pos < ELF_NGREG; --count)
set_reg(regs, pos++, *k++);
else
for (; count > 0 && pos < ELF_NGREG; --count) {
if (__get_user(reg, u++))
return -EFAULT;
set_reg(regs, pos++, reg);
}
kbuf = k;
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
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;
}

8
tools/testing/selftests/seccomp/seccomp_bpf.c
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@ -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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