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cfc9066bcd
git commit 20b40a794b "signal race with restarting system calls"
added code to the poke_user/poke_user_compat to reset the system call
restart information in the thread-info if the PSW address is changed.
The purpose of that change has been to workaround old gdbs that do
not know about the REGSET_SYSTEM_CALL. It turned out that this is not
a good idea, it makes the behaviour of the debuggee dependent on the
order of specific ptrace call, e.g. the REGSET_SYSTEM_CALL register
set needs to be written last. And the workaround does not really fix
old gdbs, inferior calls on interrupted restarting system calls do not
work either way.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1241 lines
33 KiB
C
1241 lines
33 KiB
C
/*
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* Ptrace user space interface.
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*
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* Copyright IBM Corp. 1999,2010
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* Author(s): Denis Joseph Barrow
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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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/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <linux/audit.h>
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#include <linux/signal.h>
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#include <linux/elf.h>
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#include <linux/regset.h>
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#include <linux/tracehook.h>
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#include <linux/seccomp.h>
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#include <trace/syscall.h>
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#include <asm/compat.h>
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#include <asm/segment.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include "entry.h"
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#ifdef CONFIG_COMPAT
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#include "compat_ptrace.h"
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#endif
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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enum s390_regset {
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REGSET_GENERAL,
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REGSET_FP,
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REGSET_LAST_BREAK,
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REGSET_SYSTEM_CALL,
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REGSET_GENERAL_EXTENDED,
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};
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void update_per_regs(struct task_struct *task)
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{
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struct pt_regs *regs = task_pt_regs(task);
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struct thread_struct *thread = &task->thread;
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struct per_regs old, new;
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/* Copy user specified PER registers */
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new.control = thread->per_user.control;
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new.start = thread->per_user.start;
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new.end = thread->per_user.end;
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/* merge TIF_SINGLE_STEP into user specified PER registers. */
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if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) {
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new.control |= PER_EVENT_IFETCH;
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new.start = 0;
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new.end = PSW_ADDR_INSN;
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}
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/* Take care of the PER enablement bit in the PSW. */
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if (!(new.control & PER_EVENT_MASK)) {
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regs->psw.mask &= ~PSW_MASK_PER;
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return;
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}
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regs->psw.mask |= PSW_MASK_PER;
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__ctl_store(old, 9, 11);
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if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
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__ctl_load(new, 9, 11);
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}
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void user_enable_single_step(struct task_struct *task)
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{
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set_tsk_thread_flag(task, TIF_SINGLE_STEP);
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if (task == current)
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update_per_regs(task);
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}
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void user_disable_single_step(struct task_struct *task)
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{
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clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
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if (task == current)
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update_per_regs(task);
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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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* Clear all debugging related fields.
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*/
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void ptrace_disable(struct task_struct *task)
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{
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memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
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memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
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clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
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clear_tsk_thread_flag(task, TIF_PER_TRAP);
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}
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#ifndef CONFIG_64BIT
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# define __ADDR_MASK 3
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#else
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# define __ADDR_MASK 7
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#endif
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static inline unsigned long __peek_user_per(struct task_struct *child,
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addr_t addr)
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{
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struct per_struct_kernel *dummy = NULL;
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if (addr == (addr_t) &dummy->cr9)
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/* Control bits of the active per set. */
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return test_thread_flag(TIF_SINGLE_STEP) ?
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PER_EVENT_IFETCH : child->thread.per_user.control;
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else if (addr == (addr_t) &dummy->cr10)
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/* Start address of the active per set. */
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return test_thread_flag(TIF_SINGLE_STEP) ?
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0 : child->thread.per_user.start;
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else if (addr == (addr_t) &dummy->cr11)
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/* End address of the active per set. */
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return test_thread_flag(TIF_SINGLE_STEP) ?
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PSW_ADDR_INSN : child->thread.per_user.end;
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else if (addr == (addr_t) &dummy->bits)
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/* Single-step bit. */
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return test_thread_flag(TIF_SINGLE_STEP) ?
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(1UL << (BITS_PER_LONG - 1)) : 0;
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else if (addr == (addr_t) &dummy->starting_addr)
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/* Start address of the user specified per set. */
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return child->thread.per_user.start;
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else if (addr == (addr_t) &dummy->ending_addr)
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/* End address of the user specified per set. */
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return child->thread.per_user.end;
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else if (addr == (addr_t) &dummy->perc_atmid)
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/* PER code, ATMID and AI of the last PER trap */
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return (unsigned long)
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child->thread.per_event.cause << (BITS_PER_LONG - 16);
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else if (addr == (addr_t) &dummy->address)
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/* Address of the last PER trap */
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return child->thread.per_event.address;
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else if (addr == (addr_t) &dummy->access_id)
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/* Access id of the last PER trap */
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return (unsigned long)
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child->thread.per_event.paid << (BITS_PER_LONG - 8);
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return 0;
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}
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/*
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* Read the word at offset addr from the user area of a process. The
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* trouble here is that the information is littered over different
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* locations. The process registers are found on the kernel stack,
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* the floating point stuff and the trace settings are stored in
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* the task structure. In addition the different structures in
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* struct user contain pad bytes that should be read as zeroes.
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* Lovely...
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*/
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static unsigned long __peek_user(struct task_struct *child, addr_t addr)
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{
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struct user *dummy = NULL;
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addr_t offset, tmp;
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if (addr < (addr_t) &dummy->regs.acrs) {
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/*
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* psw and gprs are stored on the stack
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*/
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tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
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if (addr == (addr_t) &dummy->regs.psw.mask)
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/* Return a clean psw mask. */
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tmp = psw_user_bits | (tmp & PSW_MASK_USER);
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} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
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/*
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* access registers are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.acrs;
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#ifdef CONFIG_64BIT
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/*
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* Very special case: old & broken 64 bit gdb reading
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* from acrs[15]. Result is a 64 bit value. Read the
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* 32 bit acrs[15] value and shift it by 32. Sick...
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*/
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if (addr == (addr_t) &dummy->regs.acrs[15])
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tmp = ((unsigned long) child->thread.acrs[15]) << 32;
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else
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#endif
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tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
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} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
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/*
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* orig_gpr2 is stored on the kernel stack
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*/
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tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
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} else if (addr < (addr_t) &dummy->regs.fp_regs) {
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/*
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* prevent reads of padding hole between
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* orig_gpr2 and fp_regs on s390.
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*/
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tmp = 0;
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} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
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/*
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* floating point regs. are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.fp_regs;
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tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
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if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
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tmp &= (unsigned long) FPC_VALID_MASK
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<< (BITS_PER_LONG - 32);
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} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
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/*
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* Handle access to the per_info structure.
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*/
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addr -= (addr_t) &dummy->regs.per_info;
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tmp = __peek_user_per(child, addr);
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} else
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tmp = 0;
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return tmp;
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}
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static int
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peek_user(struct task_struct *child, addr_t addr, addr_t data)
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{
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addr_t tmp, mask;
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/*
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* Stupid gdb peeks/pokes the access registers in 64 bit with
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* an alignment of 4. Programmers from hell...
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*/
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mask = __ADDR_MASK;
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#ifdef CONFIG_64BIT
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if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
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addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
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mask = 3;
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#endif
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if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
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return -EIO;
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tmp = __peek_user(child, addr);
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return put_user(tmp, (addr_t __user *) data);
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}
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static inline void __poke_user_per(struct task_struct *child,
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addr_t addr, addr_t data)
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{
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struct per_struct_kernel *dummy = NULL;
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/*
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* There are only three fields in the per_info struct that the
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* debugger user can write to.
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* 1) cr9: the debugger wants to set a new PER event mask
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* 2) starting_addr: the debugger wants to set a new starting
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* address to use with the PER event mask.
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* 3) ending_addr: the debugger wants to set a new ending
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* address to use with the PER event mask.
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* The user specified PER event mask and the start and end
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* addresses are used only if single stepping is not in effect.
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* Writes to any other field in per_info are ignored.
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*/
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if (addr == (addr_t) &dummy->cr9)
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/* PER event mask of the user specified per set. */
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child->thread.per_user.control =
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data & (PER_EVENT_MASK | PER_CONTROL_MASK);
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else if (addr == (addr_t) &dummy->starting_addr)
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/* Starting address of the user specified per set. */
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child->thread.per_user.start = data;
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else if (addr == (addr_t) &dummy->ending_addr)
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/* Ending address of the user specified per set. */
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child->thread.per_user.end = data;
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}
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/*
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* Write a word to the user area of a process at location addr. This
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* operation does have an additional problem compared to peek_user.
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* Stores to the program status word and on the floating point
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* control register needs to get checked for validity.
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*/
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static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
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{
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struct user *dummy = NULL;
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addr_t offset;
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if (addr < (addr_t) &dummy->regs.acrs) {
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/*
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* psw and gprs are stored on the stack
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*/
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if (addr == (addr_t) &dummy->regs.psw.mask &&
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((data & ~PSW_MASK_USER) != psw_user_bits ||
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((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))))
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/* Invalid psw mask. */
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return -EINVAL;
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*(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
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} else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
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/*
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* access registers are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.acrs;
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#ifdef CONFIG_64BIT
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/*
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* Very special case: old & broken 64 bit gdb writing
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* to acrs[15] with a 64 bit value. Ignore the lower
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* half of the value and write the upper 32 bit to
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* acrs[15]. Sick...
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*/
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if (addr == (addr_t) &dummy->regs.acrs[15])
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child->thread.acrs[15] = (unsigned int) (data >> 32);
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else
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#endif
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*(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
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} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
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/*
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* orig_gpr2 is stored on the kernel stack
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*/
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task_pt_regs(child)->orig_gpr2 = data;
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} else if (addr < (addr_t) &dummy->regs.fp_regs) {
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/*
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* prevent writes of padding hole between
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* orig_gpr2 and fp_regs on s390.
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*/
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return 0;
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} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
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/*
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* floating point regs. are stored in the thread structure
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*/
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if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
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(data & ~((unsigned long) FPC_VALID_MASK
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<< (BITS_PER_LONG - 32))) != 0)
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return -EINVAL;
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offset = addr - (addr_t) &dummy->regs.fp_regs;
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*(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
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} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
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/*
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* Handle access to the per_info structure.
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*/
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addr -= (addr_t) &dummy->regs.per_info;
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__poke_user_per(child, addr, data);
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}
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return 0;
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}
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static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
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{
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addr_t mask;
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/*
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* Stupid gdb peeks/pokes the access registers in 64 bit with
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* an alignment of 4. Programmers from hell indeed...
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*/
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mask = __ADDR_MASK;
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#ifdef CONFIG_64BIT
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if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
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addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
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mask = 3;
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#endif
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if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
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return -EIO;
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return __poke_user(child, addr, data);
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}
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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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ptrace_area parea;
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int copied, ret;
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switch (request) {
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case PTRACE_PEEKUSR:
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/* read the word at location addr in the USER area. */
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return peek_user(child, addr, data);
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case PTRACE_POKEUSR:
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/* write the word at location addr in the USER area */
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return poke_user(child, addr, data);
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case PTRACE_PEEKUSR_AREA:
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case PTRACE_POKEUSR_AREA:
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if (copy_from_user(&parea, (void __force __user *) addr,
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sizeof(parea)))
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return -EFAULT;
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addr = parea.kernel_addr;
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data = parea.process_addr;
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copied = 0;
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while (copied < parea.len) {
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if (request == PTRACE_PEEKUSR_AREA)
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ret = peek_user(child, addr, data);
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else {
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addr_t utmp;
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if (get_user(utmp,
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(addr_t __force __user *) data))
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return -EFAULT;
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ret = poke_user(child, addr, utmp);
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}
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if (ret)
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return ret;
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addr += sizeof(unsigned long);
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data += sizeof(unsigned long);
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copied += sizeof(unsigned long);
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}
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return 0;
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case PTRACE_GET_LAST_BREAK:
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put_user(task_thread_info(child)->last_break,
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(unsigned long __user *) data);
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return 0;
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default:
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/* Removing high order bit from addr (only for 31 bit). */
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addr &= PSW_ADDR_INSN;
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return ptrace_request(child, request, addr, data);
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}
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}
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#ifdef CONFIG_COMPAT
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/*
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* Now the fun part starts... a 31 bit program running in the
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* 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
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* PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
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* to handle, the difference to the 64 bit versions of the requests
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* is that the access is done in multiples of 4 byte instead of
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* 8 bytes (sizeof(unsigned long) on 31/64 bit).
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* The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
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* PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
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* is a 31 bit program too, the content of struct user can be
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* emulated. A 31 bit program peeking into the struct user of
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* a 64 bit program is a no-no.
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*/
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/*
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* Same as peek_user_per but for a 31 bit program.
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*/
|
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static inline __u32 __peek_user_per_compat(struct task_struct *child,
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addr_t addr)
|
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{
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struct compat_per_struct_kernel *dummy32 = NULL;
|
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|
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if (addr == (addr_t) &dummy32->cr9)
|
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/* Control bits of the active per set. */
|
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return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
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PER_EVENT_IFETCH : child->thread.per_user.control;
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else if (addr == (addr_t) &dummy32->cr10)
|
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/* Start address of the active per set. */
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return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
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0 : child->thread.per_user.start;
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else if (addr == (addr_t) &dummy32->cr11)
|
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/* End address of the active per set. */
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return test_thread_flag(TIF_SINGLE_STEP) ?
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PSW32_ADDR_INSN : child->thread.per_user.end;
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else if (addr == (addr_t) &dummy32->bits)
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/* Single-step bit. */
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return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
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0x80000000 : 0;
|
|
else if (addr == (addr_t) &dummy32->starting_addr)
|
|
/* Start address of the user specified per set. */
|
|
return (__u32) child->thread.per_user.start;
|
|
else if (addr == (addr_t) &dummy32->ending_addr)
|
|
/* End address of the user specified per set. */
|
|
return (__u32) child->thread.per_user.end;
|
|
else if (addr == (addr_t) &dummy32->perc_atmid)
|
|
/* PER code, ATMID and AI of the last PER trap */
|
|
return (__u32) child->thread.per_event.cause << 16;
|
|
else if (addr == (addr_t) &dummy32->address)
|
|
/* Address of the last PER trap */
|
|
return (__u32) child->thread.per_event.address;
|
|
else if (addr == (addr_t) &dummy32->access_id)
|
|
/* Access id of the last PER trap */
|
|
return (__u32) child->thread.per_event.paid << 24;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Same as peek_user but for a 31 bit program.
|
|
*/
|
|
static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
|
|
{
|
|
struct compat_user *dummy32 = NULL;
|
|
addr_t offset;
|
|
__u32 tmp;
|
|
|
|
if (addr < (addr_t) &dummy32->regs.acrs) {
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
/*
|
|
* psw and gprs are stored on the stack
|
|
*/
|
|
if (addr == (addr_t) &dummy32->regs.psw.mask) {
|
|
/* Fake a 31 bit psw mask. */
|
|
tmp = (__u32)(regs->psw.mask >> 32);
|
|
tmp = psw32_user_bits | (tmp & PSW32_MASK_USER);
|
|
} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
|
|
/* Fake a 31 bit psw address. */
|
|
tmp = (__u32) regs->psw.addr |
|
|
(__u32)(regs->psw.mask & PSW_MASK_BA);
|
|
} else {
|
|
/* gpr 0-15 */
|
|
tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
|
|
}
|
|
} else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
|
|
/*
|
|
* access registers are stored in the thread structure
|
|
*/
|
|
offset = addr - (addr_t) &dummy32->regs.acrs;
|
|
tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
|
|
|
|
} else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
|
|
/*
|
|
* orig_gpr2 is stored on the kernel stack
|
|
*/
|
|
tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
|
|
|
|
} else if (addr < (addr_t) &dummy32->regs.fp_regs) {
|
|
/*
|
|
* prevent reads of padding hole between
|
|
* orig_gpr2 and fp_regs on s390.
|
|
*/
|
|
tmp = 0;
|
|
|
|
} else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
|
|
/*
|
|
* floating point regs. are stored in the thread structure
|
|
*/
|
|
offset = addr - (addr_t) &dummy32->regs.fp_regs;
|
|
tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
|
|
|
|
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
|
|
/*
|
|
* Handle access to the per_info structure.
|
|
*/
|
|
addr -= (addr_t) &dummy32->regs.per_info;
|
|
tmp = __peek_user_per_compat(child, addr);
|
|
|
|
} else
|
|
tmp = 0;
|
|
|
|
return tmp;
|
|
}
|
|
|
|
static int peek_user_compat(struct task_struct *child,
|
|
addr_t addr, addr_t data)
|
|
{
|
|
__u32 tmp;
|
|
|
|
if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
|
|
return -EIO;
|
|
|
|
tmp = __peek_user_compat(child, addr);
|
|
return put_user(tmp, (__u32 __user *) data);
|
|
}
|
|
|
|
/*
|
|
* Same as poke_user_per but for a 31 bit program.
|
|
*/
|
|
static inline void __poke_user_per_compat(struct task_struct *child,
|
|
addr_t addr, __u32 data)
|
|
{
|
|
struct compat_per_struct_kernel *dummy32 = NULL;
|
|
|
|
if (addr == (addr_t) &dummy32->cr9)
|
|
/* PER event mask of the user specified per set. */
|
|
child->thread.per_user.control =
|
|
data & (PER_EVENT_MASK | PER_CONTROL_MASK);
|
|
else if (addr == (addr_t) &dummy32->starting_addr)
|
|
/* Starting address of the user specified per set. */
|
|
child->thread.per_user.start = data;
|
|
else if (addr == (addr_t) &dummy32->ending_addr)
|
|
/* Ending address of the user specified per set. */
|
|
child->thread.per_user.end = data;
|
|
}
|
|
|
|
/*
|
|
* Same as poke_user but for a 31 bit program.
|
|
*/
|
|
static int __poke_user_compat(struct task_struct *child,
|
|
addr_t addr, addr_t data)
|
|
{
|
|
struct compat_user *dummy32 = NULL;
|
|
__u32 tmp = (__u32) data;
|
|
addr_t offset;
|
|
|
|
if (addr < (addr_t) &dummy32->regs.acrs) {
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
/*
|
|
* psw, gprs, acrs and orig_gpr2 are stored on the stack
|
|
*/
|
|
if (addr == (addr_t) &dummy32->regs.psw.mask) {
|
|
/* Build a 64 bit psw mask from 31 bit mask. */
|
|
if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits)
|
|
/* Invalid psw mask. */
|
|
return -EINVAL;
|
|
regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
|
|
(regs->psw.mask & PSW_MASK_BA) |
|
|
(__u64)(tmp & PSW32_MASK_USER) << 32;
|
|
} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
|
|
/* Build a 64 bit psw address from 31 bit address. */
|
|
regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
|
|
/* Transfer 31 bit amode bit to psw mask. */
|
|
regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
|
|
(__u64)(tmp & PSW32_ADDR_AMODE);
|
|
} else {
|
|
/* gpr 0-15 */
|
|
*(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
|
|
}
|
|
} else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
|
|
/*
|
|
* access registers are stored in the thread structure
|
|
*/
|
|
offset = addr - (addr_t) &dummy32->regs.acrs;
|
|
*(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
|
|
|
|
} else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
|
|
/*
|
|
* orig_gpr2 is stored on the kernel stack
|
|
*/
|
|
*(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
|
|
|
|
} else if (addr < (addr_t) &dummy32->regs.fp_regs) {
|
|
/*
|
|
* prevent writess of padding hole between
|
|
* orig_gpr2 and fp_regs on s390.
|
|
*/
|
|
return 0;
|
|
|
|
} else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
|
|
/*
|
|
* floating point regs. are stored in the thread structure
|
|
*/
|
|
if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
|
|
(tmp & ~FPC_VALID_MASK) != 0)
|
|
/* Invalid floating point control. */
|
|
return -EINVAL;
|
|
offset = addr - (addr_t) &dummy32->regs.fp_regs;
|
|
*(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
|
|
|
|
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
|
|
/*
|
|
* Handle access to the per_info structure.
|
|
*/
|
|
addr -= (addr_t) &dummy32->regs.per_info;
|
|
__poke_user_per_compat(child, addr, data);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int poke_user_compat(struct task_struct *child,
|
|
addr_t addr, addr_t data)
|
|
{
|
|
if (!is_compat_task() || (addr & 3) ||
|
|
addr > sizeof(struct compat_user) - 3)
|
|
return -EIO;
|
|
|
|
return __poke_user_compat(child, addr, data);
|
|
}
|
|
|
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
|
|
compat_ulong_t caddr, compat_ulong_t cdata)
|
|
{
|
|
unsigned long addr = caddr;
|
|
unsigned long data = cdata;
|
|
compat_ptrace_area parea;
|
|
int copied, ret;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKUSR:
|
|
/* read the word at location addr in the USER area. */
|
|
return peek_user_compat(child, addr, data);
|
|
|
|
case PTRACE_POKEUSR:
|
|
/* write the word at location addr in the USER area */
|
|
return poke_user_compat(child, addr, data);
|
|
|
|
case PTRACE_PEEKUSR_AREA:
|
|
case PTRACE_POKEUSR_AREA:
|
|
if (copy_from_user(&parea, (void __force __user *) addr,
|
|
sizeof(parea)))
|
|
return -EFAULT;
|
|
addr = parea.kernel_addr;
|
|
data = parea.process_addr;
|
|
copied = 0;
|
|
while (copied < parea.len) {
|
|
if (request == PTRACE_PEEKUSR_AREA)
|
|
ret = peek_user_compat(child, addr, data);
|
|
else {
|
|
__u32 utmp;
|
|
if (get_user(utmp,
|
|
(__u32 __force __user *) data))
|
|
return -EFAULT;
|
|
ret = poke_user_compat(child, addr, utmp);
|
|
}
|
|
if (ret)
|
|
return ret;
|
|
addr += sizeof(unsigned int);
|
|
data += sizeof(unsigned int);
|
|
copied += sizeof(unsigned int);
|
|
}
|
|
return 0;
|
|
case PTRACE_GET_LAST_BREAK:
|
|
put_user(task_thread_info(child)->last_break,
|
|
(unsigned int __user *) data);
|
|
return 0;
|
|
}
|
|
return compat_ptrace_request(child, request, addr, data);
|
|
}
|
|
#endif
|
|
|
|
asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
long ret = 0;
|
|
|
|
/* Do the secure computing check first. */
|
|
secure_computing(regs->gprs[2]);
|
|
|
|
/*
|
|
* The sysc_tracesys code in entry.S stored the system
|
|
* call number to gprs[2].
|
|
*/
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
|
|
(tracehook_report_syscall_entry(regs) ||
|
|
regs->gprs[2] >= NR_syscalls)) {
|
|
/*
|
|
* Tracing decided this syscall should not happen or the
|
|
* debugger stored an invalid system call number. Skip
|
|
* the system call and the system call restart handling.
|
|
*/
|
|
clear_thread_flag(TIF_SYSCALL);
|
|
ret = -1;
|
|
}
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_enter(regs, regs->gprs[2]);
|
|
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_entry(is_compat_task() ?
|
|
AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
|
|
regs->gprs[2], regs->orig_gpr2,
|
|
regs->gprs[3], regs->gprs[4],
|
|
regs->gprs[5]);
|
|
return ret ?: regs->gprs[2];
|
|
}
|
|
|
|
asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
|
|
{
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]),
|
|
regs->gprs[2]);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_exit(regs, regs->gprs[2]);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, 0);
|
|
}
|
|
|
|
/*
|
|
* user_regset definitions.
|
|
*/
|
|
|
|
static int s390_regs_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
if (target == current)
|
|
save_access_regs(target->thread.acrs);
|
|
|
|
if (kbuf) {
|
|
unsigned long *k = kbuf;
|
|
while (count > 0) {
|
|
*k++ = __peek_user(target, pos);
|
|
count -= sizeof(*k);
|
|
pos += sizeof(*k);
|
|
}
|
|
} else {
|
|
unsigned long __user *u = ubuf;
|
|
while (count > 0) {
|
|
if (__put_user(__peek_user(target, pos), u++))
|
|
return -EFAULT;
|
|
count -= sizeof(*u);
|
|
pos += sizeof(*u);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int s390_regs_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (target == current)
|
|
save_access_regs(target->thread.acrs);
|
|
|
|
if (kbuf) {
|
|
const unsigned long *k = kbuf;
|
|
while (count > 0 && !rc) {
|
|
rc = __poke_user(target, pos, *k++);
|
|
count -= sizeof(*k);
|
|
pos += sizeof(*k);
|
|
}
|
|
} else {
|
|
const unsigned long __user *u = ubuf;
|
|
while (count > 0 && !rc) {
|
|
unsigned long word;
|
|
rc = __get_user(word, u++);
|
|
if (rc)
|
|
break;
|
|
rc = __poke_user(target, pos, word);
|
|
count -= sizeof(*u);
|
|
pos += sizeof(*u);
|
|
}
|
|
}
|
|
|
|
if (rc == 0 && target == current)
|
|
restore_access_regs(target->thread.acrs);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int s390_fpregs_get(struct task_struct *target,
|
|
const struct user_regset *regset, unsigned int pos,
|
|
unsigned int count, void *kbuf, void __user *ubuf)
|
|
{
|
|
if (target == current)
|
|
save_fp_regs(&target->thread.fp_regs);
|
|
|
|
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.fp_regs, 0, -1);
|
|
}
|
|
|
|
static int s390_fpregs_set(struct task_struct *target,
|
|
const struct user_regset *regset, unsigned int pos,
|
|
unsigned int count, const void *kbuf,
|
|
const void __user *ubuf)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (target == current)
|
|
save_fp_regs(&target->thread.fp_regs);
|
|
|
|
/* If setting FPC, must validate it first. */
|
|
if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
|
|
u32 fpc[2] = { target->thread.fp_regs.fpc, 0 };
|
|
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc,
|
|
0, offsetof(s390_fp_regs, fprs));
|
|
if (rc)
|
|
return rc;
|
|
if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0)
|
|
return -EINVAL;
|
|
target->thread.fp_regs.fpc = fpc[0];
|
|
}
|
|
|
|
if (rc == 0 && count > 0)
|
|
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
target->thread.fp_regs.fprs,
|
|
offsetof(s390_fp_regs, fprs), -1);
|
|
|
|
if (rc == 0 && target == current)
|
|
restore_fp_regs(&target->thread.fp_regs);
|
|
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_64BIT
|
|
|
|
static int s390_last_break_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
if (count > 0) {
|
|
if (kbuf) {
|
|
unsigned long *k = kbuf;
|
|
*k = task_thread_info(target)->last_break;
|
|
} else {
|
|
unsigned long __user *u = ubuf;
|
|
if (__put_user(task_thread_info(target)->last_break, u))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int s390_last_break_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int s390_system_call_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
unsigned int *data = &task_thread_info(target)->system_call;
|
|
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
data, 0, sizeof(unsigned int));
|
|
}
|
|
|
|
static int s390_system_call_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
unsigned int *data = &task_thread_info(target)->system_call;
|
|
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
data, 0, sizeof(unsigned int));
|
|
}
|
|
|
|
static const struct user_regset s390_regsets[] = {
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = sizeof(s390_regs) / sizeof(long),
|
|
.size = sizeof(long),
|
|
.align = sizeof(long),
|
|
.get = s390_regs_get,
|
|
.set = s390_regs_set,
|
|
},
|
|
[REGSET_FP] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(s390_fp_regs) / sizeof(long),
|
|
.size = sizeof(long),
|
|
.align = sizeof(long),
|
|
.get = s390_fpregs_get,
|
|
.set = s390_fpregs_set,
|
|
},
|
|
#ifdef CONFIG_64BIT
|
|
[REGSET_LAST_BREAK] = {
|
|
.core_note_type = NT_S390_LAST_BREAK,
|
|
.n = 1,
|
|
.size = sizeof(long),
|
|
.align = sizeof(long),
|
|
.get = s390_last_break_get,
|
|
.set = s390_last_break_set,
|
|
},
|
|
#endif
|
|
[REGSET_SYSTEM_CALL] = {
|
|
.core_note_type = NT_S390_SYSTEM_CALL,
|
|
.n = 1,
|
|
.size = sizeof(unsigned int),
|
|
.align = sizeof(unsigned int),
|
|
.get = s390_system_call_get,
|
|
.set = s390_system_call_set,
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_s390_view = {
|
|
.name = UTS_MACHINE,
|
|
.e_machine = EM_S390,
|
|
.regsets = s390_regsets,
|
|
.n = ARRAY_SIZE(s390_regsets)
|
|
};
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int s390_compat_regs_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
if (target == current)
|
|
save_access_regs(target->thread.acrs);
|
|
|
|
if (kbuf) {
|
|
compat_ulong_t *k = kbuf;
|
|
while (count > 0) {
|
|
*k++ = __peek_user_compat(target, pos);
|
|
count -= sizeof(*k);
|
|
pos += sizeof(*k);
|
|
}
|
|
} else {
|
|
compat_ulong_t __user *u = ubuf;
|
|
while (count > 0) {
|
|
if (__put_user(__peek_user_compat(target, pos), u++))
|
|
return -EFAULT;
|
|
count -= sizeof(*u);
|
|
pos += sizeof(*u);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int s390_compat_regs_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (target == current)
|
|
save_access_regs(target->thread.acrs);
|
|
|
|
if (kbuf) {
|
|
const compat_ulong_t *k = kbuf;
|
|
while (count > 0 && !rc) {
|
|
rc = __poke_user_compat(target, pos, *k++);
|
|
count -= sizeof(*k);
|
|
pos += sizeof(*k);
|
|
}
|
|
} else {
|
|
const compat_ulong_t __user *u = ubuf;
|
|
while (count > 0 && !rc) {
|
|
compat_ulong_t word;
|
|
rc = __get_user(word, u++);
|
|
if (rc)
|
|
break;
|
|
rc = __poke_user_compat(target, pos, word);
|
|
count -= sizeof(*u);
|
|
pos += sizeof(*u);
|
|
}
|
|
}
|
|
|
|
if (rc == 0 && target == current)
|
|
restore_access_regs(target->thread.acrs);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int s390_compat_regs_high_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
compat_ulong_t *gprs_high;
|
|
|
|
gprs_high = (compat_ulong_t *)
|
|
&task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
|
|
if (kbuf) {
|
|
compat_ulong_t *k = kbuf;
|
|
while (count > 0) {
|
|
*k++ = *gprs_high;
|
|
gprs_high += 2;
|
|
count -= sizeof(*k);
|
|
}
|
|
} else {
|
|
compat_ulong_t __user *u = ubuf;
|
|
while (count > 0) {
|
|
if (__put_user(*gprs_high, u++))
|
|
return -EFAULT;
|
|
gprs_high += 2;
|
|
count -= sizeof(*u);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int s390_compat_regs_high_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
compat_ulong_t *gprs_high;
|
|
int rc = 0;
|
|
|
|
gprs_high = (compat_ulong_t *)
|
|
&task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
|
|
if (kbuf) {
|
|
const compat_ulong_t *k = kbuf;
|
|
while (count > 0) {
|
|
*gprs_high = *k++;
|
|
*gprs_high += 2;
|
|
count -= sizeof(*k);
|
|
}
|
|
} else {
|
|
const compat_ulong_t __user *u = ubuf;
|
|
while (count > 0 && !rc) {
|
|
unsigned long word;
|
|
rc = __get_user(word, u++);
|
|
if (rc)
|
|
break;
|
|
*gprs_high = word;
|
|
*gprs_high += 2;
|
|
count -= sizeof(*u);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int s390_compat_last_break_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
compat_ulong_t last_break;
|
|
|
|
if (count > 0) {
|
|
last_break = task_thread_info(target)->last_break;
|
|
if (kbuf) {
|
|
unsigned long *k = kbuf;
|
|
*k = last_break;
|
|
} else {
|
|
unsigned long __user *u = ubuf;
|
|
if (__put_user(last_break, u))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int s390_compat_last_break_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct user_regset s390_compat_regsets[] = {
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
|
|
.size = sizeof(compat_long_t),
|
|
.align = sizeof(compat_long_t),
|
|
.get = s390_compat_regs_get,
|
|
.set = s390_compat_regs_set,
|
|
},
|
|
[REGSET_FP] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
|
|
.size = sizeof(compat_long_t),
|
|
.align = sizeof(compat_long_t),
|
|
.get = s390_fpregs_get,
|
|
.set = s390_fpregs_set,
|
|
},
|
|
[REGSET_LAST_BREAK] = {
|
|
.core_note_type = NT_S390_LAST_BREAK,
|
|
.n = 1,
|
|
.size = sizeof(long),
|
|
.align = sizeof(long),
|
|
.get = s390_compat_last_break_get,
|
|
.set = s390_compat_last_break_set,
|
|
},
|
|
[REGSET_SYSTEM_CALL] = {
|
|
.core_note_type = NT_S390_SYSTEM_CALL,
|
|
.n = 1,
|
|
.size = sizeof(compat_uint_t),
|
|
.align = sizeof(compat_uint_t),
|
|
.get = s390_system_call_get,
|
|
.set = s390_system_call_set,
|
|
},
|
|
[REGSET_GENERAL_EXTENDED] = {
|
|
.core_note_type = NT_S390_HIGH_GPRS,
|
|
.n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
|
|
.size = sizeof(compat_long_t),
|
|
.align = sizeof(compat_long_t),
|
|
.get = s390_compat_regs_high_get,
|
|
.set = s390_compat_regs_high_set,
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_s390_compat_view = {
|
|
.name = "s390",
|
|
.e_machine = EM_S390,
|
|
.regsets = s390_compat_regsets,
|
|
.n = ARRAY_SIZE(s390_compat_regsets)
|
|
};
|
|
#endif
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
if (test_tsk_thread_flag(task, TIF_31BIT))
|
|
return &user_s390_compat_view;
|
|
#endif
|
|
return &user_s390_view;
|
|
}
|
|
|
|
static const char *gpr_names[NUM_GPRS] = {
|
|
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
|
|
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
|
|
};
|
|
|
|
unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
|
|
{
|
|
if (offset >= NUM_GPRS)
|
|
return 0;
|
|
return regs->gprs[offset];
|
|
}
|
|
|
|
int regs_query_register_offset(const char *name)
|
|
{
|
|
unsigned long offset;
|
|
|
|
if (!name || *name != 'r')
|
|
return -EINVAL;
|
|
if (strict_strtoul(name + 1, 10, &offset))
|
|
return -EINVAL;
|
|
if (offset >= NUM_GPRS)
|
|
return -EINVAL;
|
|
return offset;
|
|
}
|
|
|
|
const char *regs_query_register_name(unsigned int offset)
|
|
{
|
|
if (offset >= NUM_GPRS)
|
|
return NULL;
|
|
return gpr_names[offset];
|
|
}
|
|
|
|
static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
|
|
{
|
|
unsigned long ksp = kernel_stack_pointer(regs);
|
|
|
|
return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
|
|
}
|
|
|
|
/**
|
|
* regs_get_kernel_stack_nth() - get Nth entry of the stack
|
|
* @regs:pt_regs which contains kernel stack pointer.
|
|
* @n:stack entry number.
|
|
*
|
|
* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
|
|
* is specifined by @regs. If the @n th entry is NOT in the kernel stack,
|
|
* this returns 0.
|
|
*/
|
|
unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
|
|
{
|
|
unsigned long addr;
|
|
|
|
addr = kernel_stack_pointer(regs) + n * sizeof(long);
|
|
if (!regs_within_kernel_stack(regs, addr))
|
|
return 0;
|
|
return *(unsigned long *)addr;
|
|
}
|