forked from Minki/linux
1201 lines
28 KiB
C
1201 lines
28 KiB
C
/* ptrace.c: Sparc process tracing support.
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*
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* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*
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* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
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* and David Mosberger.
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*
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* Added Linux support -miguel (weird, eh?, the original code was meant
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* to emulate SunOS).
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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/sched/task_stack.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/smp.h>
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#include <linux/security.h>
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#include <linux/seccomp.h>
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#include <linux/audit.h>
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#include <linux/signal.h>
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#include <linux/regset.h>
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#include <linux/tracehook.h>
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#include <trace/syscall.h>
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#include <linux/compat.h>
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#include <linux/elf.h>
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#include <linux/context_tracking.h>
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#include <asm/asi.h>
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#include <asm/pgtable.h>
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#include <linux/uaccess.h>
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#include <asm/psrcompat.h>
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#include <asm/visasm.h>
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#include <asm/spitfire.h>
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#include <asm/page.h>
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#include <asm/cpudata.h>
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#include <asm/cacheflush.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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#include "entry.h"
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/* #define ALLOW_INIT_TRACING */
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struct pt_regs_offset {
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const char *name;
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int offset;
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};
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#define REG_OFFSET_NAME(n, r) \
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{.name = n, .offset = (PT_V9_##r)}
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#define REG_OFFSET_END {.name = NULL, .offset = 0}
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static const struct pt_regs_offset regoffset_table[] = {
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REG_OFFSET_NAME("g0", G0),
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REG_OFFSET_NAME("g1", G1),
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REG_OFFSET_NAME("g2", G2),
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REG_OFFSET_NAME("g3", G3),
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REG_OFFSET_NAME("g4", G4),
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REG_OFFSET_NAME("g5", G5),
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REG_OFFSET_NAME("g6", G6),
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REG_OFFSET_NAME("g7", G7),
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REG_OFFSET_NAME("i0", I0),
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REG_OFFSET_NAME("i1", I1),
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REG_OFFSET_NAME("i2", I2),
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REG_OFFSET_NAME("i3", I3),
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REG_OFFSET_NAME("i4", I4),
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REG_OFFSET_NAME("i5", I5),
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REG_OFFSET_NAME("i6", I6),
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REG_OFFSET_NAME("i7", I7),
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REG_OFFSET_NAME("tstate", TSTATE),
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REG_OFFSET_NAME("pc", TPC),
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REG_OFFSET_NAME("npc", TNPC),
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REG_OFFSET_NAME("y", Y),
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REG_OFFSET_NAME("lr", I7),
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REG_OFFSET_END,
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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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* Make sure single step bits etc are not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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/* nothing to do */
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}
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/* To get the necessary page struct, access_process_vm() first calls
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* get_user_pages(). This has done a flush_dcache_page() on the
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* accessed page. Then our caller (copy_{to,from}_user_page()) did
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* to memcpy to read/write the data from that page.
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*
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* Now, the only thing we have to do is:
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* 1) flush the D-cache if it's possible than an illegal alias
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* has been created
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* 2) flush the I-cache if this is pre-cheetah and we did a write
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*/
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void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
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unsigned long uaddr, void *kaddr,
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unsigned long len, int write)
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{
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BUG_ON(len > PAGE_SIZE);
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if (tlb_type == hypervisor)
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return;
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preempt_disable();
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#ifdef DCACHE_ALIASING_POSSIBLE
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/* If bit 13 of the kernel address we used to access the
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* user page is the same as the virtual address that page
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* is mapped to in the user's address space, we can skip the
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* D-cache flush.
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*/
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if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
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unsigned long start = __pa(kaddr);
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unsigned long end = start + len;
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unsigned long dcache_line_size;
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dcache_line_size = local_cpu_data().dcache_line_size;
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if (tlb_type == spitfire) {
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for (; start < end; start += dcache_line_size)
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spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
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} else {
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start &= ~(dcache_line_size - 1);
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for (; start < end; start += dcache_line_size)
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__asm__ __volatile__(
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"stxa %%g0, [%0] %1\n\t"
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"membar #Sync"
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: /* no outputs */
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: "r" (start),
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"i" (ASI_DCACHE_INVALIDATE));
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}
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}
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#endif
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if (write && tlb_type == spitfire) {
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unsigned long start = (unsigned long) kaddr;
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unsigned long end = start + len;
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unsigned long icache_line_size;
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icache_line_size = local_cpu_data().icache_line_size;
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for (; start < end; start += icache_line_size)
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flushi(start);
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}
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preempt_enable();
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}
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EXPORT_SYMBOL_GPL(flush_ptrace_access);
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static int get_from_target(struct task_struct *target, unsigned long uaddr,
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void *kbuf, int len)
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{
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if (target == current) {
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if (copy_from_user(kbuf, (void __user *) uaddr, len))
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return -EFAULT;
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} else {
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int len2 = access_process_vm(target, uaddr, kbuf, len,
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FOLL_FORCE);
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if (len2 != len)
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return -EFAULT;
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}
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return 0;
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}
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static int set_to_target(struct task_struct *target, unsigned long uaddr,
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void *kbuf, int len)
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{
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if (target == current) {
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if (copy_to_user((void __user *) uaddr, kbuf, len))
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return -EFAULT;
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} else {
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int len2 = access_process_vm(target, uaddr, kbuf, len,
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FOLL_FORCE | FOLL_WRITE);
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if (len2 != len)
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return -EFAULT;
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}
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return 0;
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}
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static int regwindow64_get(struct task_struct *target,
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const struct pt_regs *regs,
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struct reg_window *wbuf)
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{
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unsigned long rw_addr = regs->u_regs[UREG_I6];
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if (!test_thread_64bit_stack(rw_addr)) {
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struct reg_window32 win32;
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int i;
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if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
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return -EFAULT;
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for (i = 0; i < 8; i++)
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wbuf->locals[i] = win32.locals[i];
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for (i = 0; i < 8; i++)
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wbuf->ins[i] = win32.ins[i];
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} else {
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rw_addr += STACK_BIAS;
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if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
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return -EFAULT;
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}
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return 0;
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}
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static int regwindow64_set(struct task_struct *target,
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const struct pt_regs *regs,
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struct reg_window *wbuf)
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{
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unsigned long rw_addr = regs->u_regs[UREG_I6];
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if (!test_thread_64bit_stack(rw_addr)) {
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struct reg_window32 win32;
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int i;
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for (i = 0; i < 8; i++)
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win32.locals[i] = wbuf->locals[i];
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for (i = 0; i < 8; i++)
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win32.ins[i] = wbuf->ins[i];
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if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
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return -EFAULT;
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} else {
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rw_addr += STACK_BIAS;
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if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
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return -EFAULT;
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}
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return 0;
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}
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enum sparc_regset {
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REGSET_GENERAL,
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REGSET_FP,
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};
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static int genregs64_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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const struct pt_regs *regs = task_pt_regs(target);
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int ret;
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if (target == current)
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flushw_user();
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->u_regs,
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0, 16 * sizeof(u64));
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if (!ret && count && pos < (32 * sizeof(u64))) {
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struct reg_window window;
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if (regwindow64_get(target, regs, &window))
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return -EFAULT;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&window,
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16 * sizeof(u64),
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32 * sizeof(u64));
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}
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if (!ret) {
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/* TSTATE, TPC, TNPC */
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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®s->tstate,
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32 * sizeof(u64),
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35 * sizeof(u64));
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}
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if (!ret) {
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unsigned long y = regs->y;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&y,
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35 * sizeof(u64),
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36 * sizeof(u64));
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}
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if (!ret) {
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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36 * sizeof(u64), -1);
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}
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return ret;
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}
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static int genregs64_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_pt_regs(target);
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int ret;
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if (target == current)
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flushw_user();
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->u_regs,
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0, 16 * sizeof(u64));
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if (!ret && count && pos < (32 * sizeof(u64))) {
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struct reg_window window;
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if (regwindow64_get(target, regs, &window))
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return -EFAULT;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&window,
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16 * sizeof(u64),
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32 * sizeof(u64));
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if (!ret &&
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regwindow64_set(target, regs, &window))
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return -EFAULT;
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}
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if (!ret && count > 0) {
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unsigned long tstate;
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/* TSTATE */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&tstate,
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32 * sizeof(u64),
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33 * sizeof(u64));
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if (!ret) {
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/* Only the condition codes and the "in syscall"
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* state can be modified in the %tstate register.
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*/
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tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
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regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
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regs->tstate |= tstate;
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}
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}
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if (!ret) {
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/* TPC, TNPC */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->tpc,
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33 * sizeof(u64),
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35 * sizeof(u64));
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}
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if (!ret) {
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unsigned long y = regs->y;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&y,
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35 * sizeof(u64),
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36 * sizeof(u64));
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if (!ret)
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regs->y = y;
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}
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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36 * sizeof(u64), -1);
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return ret;
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}
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static int fpregs64_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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const unsigned long *fpregs = task_thread_info(target)->fpregs;
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unsigned long fprs, fsr, gsr;
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int ret;
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if (target == current)
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save_and_clear_fpu();
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fprs = task_thread_info(target)->fpsaved[0];
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if (fprs & FPRS_DL)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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fpregs,
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0, 16 * sizeof(u64));
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else
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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0,
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16 * sizeof(u64));
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if (!ret) {
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if (fprs & FPRS_DU)
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ret = user_regset_copyout(&pos, &count,
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&kbuf, &ubuf,
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fpregs + 16,
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16 * sizeof(u64),
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32 * sizeof(u64));
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else
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ret = user_regset_copyout_zero(&pos, &count,
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&kbuf, &ubuf,
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16 * sizeof(u64),
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32 * sizeof(u64));
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}
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if (fprs & FPRS_FEF) {
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fsr = task_thread_info(target)->xfsr[0];
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gsr = task_thread_info(target)->gsr[0];
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} else {
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fsr = gsr = 0;
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}
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&fsr,
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32 * sizeof(u64),
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33 * sizeof(u64));
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&gsr,
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33 * sizeof(u64),
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34 * sizeof(u64));
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&fprs,
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34 * sizeof(u64),
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35 * sizeof(u64));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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35 * sizeof(u64), -1);
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return ret;
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}
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static int fpregs64_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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unsigned long *fpregs = task_thread_info(target)->fpregs;
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unsigned long fprs;
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int ret;
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if (target == current)
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save_and_clear_fpu();
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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fpregs,
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0, 32 * sizeof(u64));
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if (!ret)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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task_thread_info(target)->xfsr,
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32 * sizeof(u64),
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33 * sizeof(u64));
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if (!ret)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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task_thread_info(target)->gsr,
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33 * sizeof(u64),
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34 * sizeof(u64));
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fprs = task_thread_info(target)->fpsaved[0];
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if (!ret && count > 0) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&fprs,
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34 * sizeof(u64),
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35 * sizeof(u64));
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}
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fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
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task_thread_info(target)->fpsaved[0] = fprs;
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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35 * sizeof(u64), -1);
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return ret;
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}
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static const struct user_regset sparc64_regsets[] = {
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/* Format is:
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* G0 --> G7
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* O0 --> O7
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* L0 --> L7
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* I0 --> I7
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* TSTATE, TPC, TNPC, Y
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = 36,
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.size = sizeof(u64), .align = sizeof(u64),
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.get = genregs64_get, .set = genregs64_set
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},
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/* Format is:
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* F0 --> F63
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* FSR
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* GSR
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* FPRS
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*/
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[REGSET_FP] = {
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.core_note_type = NT_PRFPREG,
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.n = 35,
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.size = sizeof(u64), .align = sizeof(u64),
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.get = fpregs64_get, .set = fpregs64_set
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},
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};
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|
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static const struct user_regset_view user_sparc64_view = {
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.name = "sparc64", .e_machine = EM_SPARCV9,
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.regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
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};
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|
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#ifdef CONFIG_COMPAT
|
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static int genregs32_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
const struct pt_regs *regs = task_pt_regs(target);
|
|
compat_ulong_t __user *reg_window;
|
|
compat_ulong_t *k = kbuf;
|
|
compat_ulong_t __user *u = ubuf;
|
|
compat_ulong_t reg;
|
|
|
|
if (target == current)
|
|
flushw_user();
|
|
|
|
pos /= sizeof(reg);
|
|
count /= sizeof(reg);
|
|
|
|
if (kbuf) {
|
|
for (; count > 0 && pos < 16; count--)
|
|
*k++ = regs->u_regs[pos++];
|
|
|
|
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
|
|
reg_window -= 16;
|
|
if (target == current) {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (get_user(*k++, ®_window[pos++]))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (access_process_vm(target,
|
|
(unsigned long)
|
|
®_window[pos],
|
|
k, sizeof(*k),
|
|
FOLL_FORCE)
|
|
!= sizeof(*k))
|
|
return -EFAULT;
|
|
k++;
|
|
pos++;
|
|
}
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 16; count--) {
|
|
if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
|
|
return -EFAULT;
|
|
}
|
|
|
|
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
|
|
reg_window -= 16;
|
|
if (target == current) {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (get_user(reg, ®_window[pos++]) ||
|
|
put_user(reg, u++))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (access_process_vm(target,
|
|
(unsigned long)
|
|
®_window[pos],
|
|
®, sizeof(reg),
|
|
FOLL_FORCE)
|
|
!= sizeof(reg))
|
|
return -EFAULT;
|
|
if (access_process_vm(target,
|
|
(unsigned long) u,
|
|
®, sizeof(reg),
|
|
FOLL_FORCE | FOLL_WRITE)
|
|
!= sizeof(reg))
|
|
return -EFAULT;
|
|
pos++;
|
|
u++;
|
|
}
|
|
}
|
|
}
|
|
while (count > 0) {
|
|
switch (pos) {
|
|
case 32: /* PSR */
|
|
reg = tstate_to_psr(regs->tstate);
|
|
break;
|
|
case 33: /* PC */
|
|
reg = regs->tpc;
|
|
break;
|
|
case 34: /* NPC */
|
|
reg = regs->tnpc;
|
|
break;
|
|
case 35: /* Y */
|
|
reg = regs->y;
|
|
break;
|
|
case 36: /* WIM */
|
|
case 37: /* TBR */
|
|
reg = 0;
|
|
break;
|
|
default:
|
|
goto finish;
|
|
}
|
|
|
|
if (kbuf)
|
|
*k++ = reg;
|
|
else if (put_user(reg, u++))
|
|
return -EFAULT;
|
|
pos++;
|
|
count--;
|
|
}
|
|
finish:
|
|
pos *= sizeof(reg);
|
|
count *= sizeof(reg);
|
|
|
|
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
38 * sizeof(reg), -1);
|
|
}
|
|
|
|
static int genregs32_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_pt_regs(target);
|
|
compat_ulong_t __user *reg_window;
|
|
const compat_ulong_t *k = kbuf;
|
|
const compat_ulong_t __user *u = ubuf;
|
|
compat_ulong_t reg;
|
|
|
|
if (target == current)
|
|
flushw_user();
|
|
|
|
pos /= sizeof(reg);
|
|
count /= sizeof(reg);
|
|
|
|
if (kbuf) {
|
|
for (; count > 0 && pos < 16; count--)
|
|
regs->u_regs[pos++] = *k++;
|
|
|
|
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
|
|
reg_window -= 16;
|
|
if (target == current) {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (put_user(*k++, ®_window[pos++]))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (access_process_vm(target,
|
|
(unsigned long)
|
|
®_window[pos],
|
|
(void *) k,
|
|
sizeof(*k),
|
|
FOLL_FORCE | FOLL_WRITE)
|
|
!= sizeof(*k))
|
|
return -EFAULT;
|
|
k++;
|
|
pos++;
|
|
}
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 16; count--) {
|
|
if (get_user(reg, u++))
|
|
return -EFAULT;
|
|
regs->u_regs[pos++] = reg;
|
|
}
|
|
|
|
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
|
|
reg_window -= 16;
|
|
if (target == current) {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (get_user(reg, u++) ||
|
|
put_user(reg, ®_window[pos++]))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (access_process_vm(target,
|
|
(unsigned long)
|
|
u,
|
|
®, sizeof(reg),
|
|
FOLL_FORCE)
|
|
!= sizeof(reg))
|
|
return -EFAULT;
|
|
if (access_process_vm(target,
|
|
(unsigned long)
|
|
®_window[pos],
|
|
®, sizeof(reg),
|
|
FOLL_FORCE | FOLL_WRITE)
|
|
!= sizeof(reg))
|
|
return -EFAULT;
|
|
pos++;
|
|
u++;
|
|
}
|
|
}
|
|
}
|
|
while (count > 0) {
|
|
unsigned long tstate;
|
|
|
|
if (kbuf)
|
|
reg = *k++;
|
|
else if (get_user(reg, u++))
|
|
return -EFAULT;
|
|
|
|
switch (pos) {
|
|
case 32: /* PSR */
|
|
tstate = regs->tstate;
|
|
tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
|
|
tstate |= psr_to_tstate_icc(reg);
|
|
if (reg & PSR_SYSCALL)
|
|
tstate |= TSTATE_SYSCALL;
|
|
regs->tstate = tstate;
|
|
break;
|
|
case 33: /* PC */
|
|
regs->tpc = reg;
|
|
break;
|
|
case 34: /* NPC */
|
|
regs->tnpc = reg;
|
|
break;
|
|
case 35: /* Y */
|
|
regs->y = reg;
|
|
break;
|
|
case 36: /* WIM */
|
|
case 37: /* TBR */
|
|
break;
|
|
default:
|
|
goto finish;
|
|
}
|
|
|
|
pos++;
|
|
count--;
|
|
}
|
|
finish:
|
|
pos *= sizeof(reg);
|
|
count *= sizeof(reg);
|
|
|
|
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
38 * sizeof(reg), -1);
|
|
}
|
|
|
|
static int fpregs32_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
const unsigned long *fpregs = task_thread_info(target)->fpregs;
|
|
compat_ulong_t enabled;
|
|
unsigned long fprs;
|
|
compat_ulong_t fsr;
|
|
int ret = 0;
|
|
|
|
if (target == current)
|
|
save_and_clear_fpu();
|
|
|
|
fprs = task_thread_info(target)->fpsaved[0];
|
|
if (fprs & FPRS_FEF) {
|
|
fsr = task_thread_info(target)->xfsr[0];
|
|
enabled = 1;
|
|
} else {
|
|
fsr = 0;
|
|
enabled = 0;
|
|
}
|
|
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
fpregs,
|
|
0, 32 * sizeof(u32));
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
32 * sizeof(u32),
|
|
33 * sizeof(u32));
|
|
if (!ret)
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&fsr,
|
|
33 * sizeof(u32),
|
|
34 * sizeof(u32));
|
|
|
|
if (!ret) {
|
|
compat_ulong_t val;
|
|
|
|
val = (enabled << 8) | (8 << 16);
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&val,
|
|
34 * sizeof(u32),
|
|
35 * sizeof(u32));
|
|
}
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
35 * sizeof(u32), -1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int fpregs32_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
unsigned long *fpregs = task_thread_info(target)->fpregs;
|
|
unsigned long fprs;
|
|
int ret;
|
|
|
|
if (target == current)
|
|
save_and_clear_fpu();
|
|
|
|
fprs = task_thread_info(target)->fpsaved[0];
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
fpregs,
|
|
0, 32 * sizeof(u32));
|
|
if (!ret)
|
|
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
32 * sizeof(u32),
|
|
33 * sizeof(u32));
|
|
if (!ret && count > 0) {
|
|
compat_ulong_t fsr;
|
|
unsigned long val;
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
&fsr,
|
|
33 * sizeof(u32),
|
|
34 * sizeof(u32));
|
|
if (!ret) {
|
|
val = task_thread_info(target)->xfsr[0];
|
|
val &= 0xffffffff00000000UL;
|
|
val |= fsr;
|
|
task_thread_info(target)->xfsr[0] = val;
|
|
}
|
|
}
|
|
|
|
fprs |= (FPRS_FEF | FPRS_DL);
|
|
task_thread_info(target)->fpsaved[0] = fprs;
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
34 * sizeof(u32), -1);
|
|
return ret;
|
|
}
|
|
|
|
static const struct user_regset sparc32_regsets[] = {
|
|
/* Format is:
|
|
* G0 --> G7
|
|
* O0 --> O7
|
|
* L0 --> L7
|
|
* I0 --> I7
|
|
* PSR, PC, nPC, Y, WIM, TBR
|
|
*/
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = 38,
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.get = genregs32_get, .set = genregs32_set
|
|
},
|
|
/* Format is:
|
|
* F0 --> F31
|
|
* empty 32-bit word
|
|
* FSR (32--bit word)
|
|
* FPU QUEUE COUNT (8-bit char)
|
|
* FPU QUEUE ENTRYSIZE (8-bit char)
|
|
* FPU ENABLED (8-bit char)
|
|
* empty 8-bit char
|
|
* FPU QUEUE (64 32-bit ints)
|
|
*/
|
|
[REGSET_FP] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = 99,
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.get = fpregs32_get, .set = fpregs32_set
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_sparc32_view = {
|
|
.name = "sparc", .e_machine = EM_SPARC,
|
|
.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
|
|
};
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
if (test_tsk_thread_flag(task, TIF_32BIT))
|
|
return &user_sparc32_view;
|
|
#endif
|
|
return &user_sparc64_view;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_fps {
|
|
unsigned int regs[32];
|
|
unsigned int fsr;
|
|
unsigned int flags;
|
|
unsigned int extra;
|
|
unsigned int fpqd;
|
|
struct compat_fq {
|
|
unsigned int insnaddr;
|
|
unsigned int insn;
|
|
} fpq[16];
|
|
};
|
|
|
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
|
|
compat_ulong_t caddr, compat_ulong_t cdata)
|
|
{
|
|
const struct user_regset_view *view = task_user_regset_view(current);
|
|
compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
|
|
struct pt_regs32 __user *pregs;
|
|
struct compat_fps __user *fps;
|
|
unsigned long addr2 = caddr2;
|
|
unsigned long addr = caddr;
|
|
unsigned long data = cdata;
|
|
int ret;
|
|
|
|
pregs = (struct pt_regs32 __user *) addr;
|
|
fps = (struct compat_fps __user *) addr;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKUSR:
|
|
ret = (addr != 0) ? -EIO : 0;
|
|
break;
|
|
|
|
case PTRACE_GETREGS:
|
|
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
|
|
32 * sizeof(u32),
|
|
4 * sizeof(u32),
|
|
&pregs->psr);
|
|
if (!ret)
|
|
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
|
|
1 * sizeof(u32),
|
|
15 * sizeof(u32),
|
|
&pregs->u_regs[0]);
|
|
break;
|
|
|
|
case PTRACE_SETREGS:
|
|
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
|
|
32 * sizeof(u32),
|
|
4 * sizeof(u32),
|
|
&pregs->psr);
|
|
if (!ret)
|
|
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
|
|
1 * sizeof(u32),
|
|
15 * sizeof(u32),
|
|
&pregs->u_regs[0]);
|
|
break;
|
|
|
|
case PTRACE_GETFPREGS:
|
|
ret = copy_regset_to_user(child, view, REGSET_FP,
|
|
0 * sizeof(u32),
|
|
32 * sizeof(u32),
|
|
&fps->regs[0]);
|
|
if (!ret)
|
|
ret = copy_regset_to_user(child, view, REGSET_FP,
|
|
33 * sizeof(u32),
|
|
1 * sizeof(u32),
|
|
&fps->fsr);
|
|
if (!ret) {
|
|
if (__put_user(0, &fps->flags) ||
|
|
__put_user(0, &fps->extra) ||
|
|
__put_user(0, &fps->fpqd) ||
|
|
clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
|
|
ret = -EFAULT;
|
|
}
|
|
break;
|
|
|
|
case PTRACE_SETFPREGS:
|
|
ret = copy_regset_from_user(child, view, REGSET_FP,
|
|
0 * sizeof(u32),
|
|
32 * sizeof(u32),
|
|
&fps->regs[0]);
|
|
if (!ret)
|
|
ret = copy_regset_from_user(child, view, REGSET_FP,
|
|
33 * sizeof(u32),
|
|
1 * sizeof(u32),
|
|
&fps->fsr);
|
|
break;
|
|
|
|
case PTRACE_READTEXT:
|
|
case PTRACE_READDATA:
|
|
ret = ptrace_readdata(child, addr,
|
|
(char __user *)addr2, data);
|
|
if (ret == data)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
break;
|
|
|
|
case PTRACE_WRITETEXT:
|
|
case PTRACE_WRITEDATA:
|
|
ret = ptrace_writedata(child, (char __user *) addr2,
|
|
addr, data);
|
|
if (ret == data)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
break;
|
|
|
|
default:
|
|
if (request == PTRACE_SPARC_DETACH)
|
|
request = PTRACE_DETACH;
|
|
ret = compat_ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
struct fps {
|
|
unsigned int regs[64];
|
|
unsigned long fsr;
|
|
};
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
const struct user_regset_view *view = task_user_regset_view(current);
|
|
unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
|
|
struct pt_regs __user *pregs;
|
|
struct fps __user *fps;
|
|
void __user *addr2p;
|
|
int ret;
|
|
|
|
pregs = (struct pt_regs __user *) addr;
|
|
fps = (struct fps __user *) addr;
|
|
addr2p = (void __user *) addr2;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKUSR:
|
|
ret = (addr != 0) ? -EIO : 0;
|
|
break;
|
|
|
|
case PTRACE_GETREGS64:
|
|
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
|
|
1 * sizeof(u64),
|
|
15 * sizeof(u64),
|
|
&pregs->u_regs[0]);
|
|
if (!ret) {
|
|
/* XXX doesn't handle 'y' register correctly XXX */
|
|
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
|
|
32 * sizeof(u64),
|
|
4 * sizeof(u64),
|
|
&pregs->tstate);
|
|
}
|
|
break;
|
|
|
|
case PTRACE_SETREGS64:
|
|
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
|
|
1 * sizeof(u64),
|
|
15 * sizeof(u64),
|
|
&pregs->u_regs[0]);
|
|
if (!ret) {
|
|
/* XXX doesn't handle 'y' register correctly XXX */
|
|
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
|
|
32 * sizeof(u64),
|
|
4 * sizeof(u64),
|
|
&pregs->tstate);
|
|
}
|
|
break;
|
|
|
|
case PTRACE_GETFPREGS64:
|
|
ret = copy_regset_to_user(child, view, REGSET_FP,
|
|
0 * sizeof(u64),
|
|
33 * sizeof(u64),
|
|
fps);
|
|
break;
|
|
|
|
case PTRACE_SETFPREGS64:
|
|
ret = copy_regset_from_user(child, view, REGSET_FP,
|
|
0 * sizeof(u64),
|
|
33 * sizeof(u64),
|
|
fps);
|
|
break;
|
|
|
|
case PTRACE_READTEXT:
|
|
case PTRACE_READDATA:
|
|
ret = ptrace_readdata(child, addr, addr2p, data);
|
|
if (ret == data)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
break;
|
|
|
|
case PTRACE_WRITETEXT:
|
|
case PTRACE_WRITEDATA:
|
|
ret = ptrace_writedata(child, addr2p, addr, data);
|
|
if (ret == data)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
break;
|
|
|
|
default:
|
|
if (request == PTRACE_SPARC_DETACH)
|
|
request = PTRACE_DETACH;
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
int ret = 0;
|
|
|
|
/* do the secure computing check first */
|
|
secure_computing_strict(regs->u_regs[UREG_G1]);
|
|
|
|
if (test_thread_flag(TIF_NOHZ))
|
|
user_exit();
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
ret = tracehook_report_syscall_entry(regs);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_enter(regs, regs->u_regs[UREG_G1]);
|
|
|
|
audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
|
|
regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
|
|
regs->u_regs[UREG_I3]);
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
if (test_thread_flag(TIF_NOHZ))
|
|
user_exit();
|
|
|
|
audit_syscall_exit(regs);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_exit(regs, regs->u_regs[UREG_I0]);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, 0);
|
|
|
|
if (test_thread_flag(TIF_NOHZ))
|
|
user_enter();
|
|
}
|
|
|
|
/**
|
|
* regs_query_register_offset() - query register offset from its name
|
|
* @name: the name of a register
|
|
*
|
|
* regs_query_register_offset() returns the offset of a register in struct
|
|
* pt_regs from its name. If the name is invalid, this returns -EINVAL;
|
|
*/
|
|
int regs_query_register_offset(const char *name)
|
|
{
|
|
const struct pt_regs_offset *roff;
|
|
|
|
for (roff = regoffset_table; roff->name != NULL; roff++)
|
|
if (!strcmp(roff->name, name))
|
|
return roff->offset;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* regs_within_kernel_stack() - check the address in the stack
|
|
* @regs: pt_regs which contains kernel stack pointer.
|
|
* @addr: address which is checked.
|
|
*
|
|
* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
|
|
* If @addr is within the kernel stack, it returns true. If not, returns false.
|
|
*/
|
|
static inline int regs_within_kernel_stack(struct pt_regs *regs,
|
|
unsigned long addr)
|
|
{
|
|
unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
|
|
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 specified 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 ksp = kernel_stack_pointer(regs) + STACK_BIAS;
|
|
unsigned long *addr = (unsigned long *)ksp;
|
|
addr += n;
|
|
if (regs_within_kernel_stack(regs, (unsigned long)addr))
|
|
return *addr;
|
|
else
|
|
return 0;
|
|
}
|