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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* By Ross Biro 1/23/92 */
0003 /*
0004  * Pentium III FXSR, SSE support
0005  *  Gareth Hughes <gareth@valinux.com>, May 2000
0006  */
0007 
0008 #include <linux/kernel.h>
0009 #include <linux/sched.h>
0010 #include <linux/sched/task_stack.h>
0011 #include <linux/mm.h>
0012 #include <linux/smp.h>
0013 #include <linux/errno.h>
0014 #include <linux/slab.h>
0015 #include <linux/ptrace.h>
0016 #include <linux/user.h>
0017 #include <linux/elf.h>
0018 #include <linux/security.h>
0019 #include <linux/audit.h>
0020 #include <linux/seccomp.h>
0021 #include <linux/signal.h>
0022 #include <linux/perf_event.h>
0023 #include <linux/hw_breakpoint.h>
0024 #include <linux/rcupdate.h>
0025 #include <linux/export.h>
0026 #include <linux/context_tracking.h>
0027 #include <linux/nospec.h>
0028 
0029 #include <linux/uaccess.h>
0030 #include <asm/processor.h>
0031 #include <asm/fpu/signal.h>
0032 #include <asm/fpu/regset.h>
0033 #include <asm/fpu/xstate.h>
0034 #include <asm/debugreg.h>
0035 #include <asm/ldt.h>
0036 #include <asm/desc.h>
0037 #include <asm/prctl.h>
0038 #include <asm/proto.h>
0039 #include <asm/hw_breakpoint.h>
0040 #include <asm/traps.h>
0041 #include <asm/syscall.h>
0042 #include <asm/fsgsbase.h>
0043 #include <asm/io_bitmap.h>
0044 
0045 #include "tls.h"
0046 
0047 enum x86_regset {
0048     REGSET_GENERAL,
0049     REGSET_FP,
0050     REGSET_XFP,
0051     REGSET_IOPERM64 = REGSET_XFP,
0052     REGSET_XSTATE,
0053     REGSET_TLS,
0054     REGSET_IOPERM32,
0055 };
0056 
0057 struct pt_regs_offset {
0058     const char *name;
0059     int offset;
0060 };
0061 
0062 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
0063 #define REG_OFFSET_END {.name = NULL, .offset = 0}
0064 
0065 static const struct pt_regs_offset regoffset_table[] = {
0066 #ifdef CONFIG_X86_64
0067     REG_OFFSET_NAME(r15),
0068     REG_OFFSET_NAME(r14),
0069     REG_OFFSET_NAME(r13),
0070     REG_OFFSET_NAME(r12),
0071     REG_OFFSET_NAME(r11),
0072     REG_OFFSET_NAME(r10),
0073     REG_OFFSET_NAME(r9),
0074     REG_OFFSET_NAME(r8),
0075 #endif
0076     REG_OFFSET_NAME(bx),
0077     REG_OFFSET_NAME(cx),
0078     REG_OFFSET_NAME(dx),
0079     REG_OFFSET_NAME(si),
0080     REG_OFFSET_NAME(di),
0081     REG_OFFSET_NAME(bp),
0082     REG_OFFSET_NAME(ax),
0083 #ifdef CONFIG_X86_32
0084     REG_OFFSET_NAME(ds),
0085     REG_OFFSET_NAME(es),
0086     REG_OFFSET_NAME(fs),
0087     REG_OFFSET_NAME(gs),
0088 #endif
0089     REG_OFFSET_NAME(orig_ax),
0090     REG_OFFSET_NAME(ip),
0091     REG_OFFSET_NAME(cs),
0092     REG_OFFSET_NAME(flags),
0093     REG_OFFSET_NAME(sp),
0094     REG_OFFSET_NAME(ss),
0095     REG_OFFSET_END,
0096 };
0097 
0098 /**
0099  * regs_query_register_offset() - query register offset from its name
0100  * @name:   the name of a register
0101  *
0102  * regs_query_register_offset() returns the offset of a register in struct
0103  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
0104  */
0105 int regs_query_register_offset(const char *name)
0106 {
0107     const struct pt_regs_offset *roff;
0108     for (roff = regoffset_table; roff->name != NULL; roff++)
0109         if (!strcmp(roff->name, name))
0110             return roff->offset;
0111     return -EINVAL;
0112 }
0113 
0114 /**
0115  * regs_query_register_name() - query register name from its offset
0116  * @offset: the offset of a register in struct pt_regs.
0117  *
0118  * regs_query_register_name() returns the name of a register from its
0119  * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
0120  */
0121 const char *regs_query_register_name(unsigned int offset)
0122 {
0123     const struct pt_regs_offset *roff;
0124     for (roff = regoffset_table; roff->name != NULL; roff++)
0125         if (roff->offset == offset)
0126             return roff->name;
0127     return NULL;
0128 }
0129 
0130 /*
0131  * does not yet catch signals sent when the child dies.
0132  * in exit.c or in signal.c.
0133  */
0134 
0135 /*
0136  * Determines which flags the user has access to [1 = access, 0 = no access].
0137  */
0138 #define FLAG_MASK_32        ((unsigned long)            \
0139                  (X86_EFLAGS_CF | X86_EFLAGS_PF |   \
0140                   X86_EFLAGS_AF | X86_EFLAGS_ZF |   \
0141                   X86_EFLAGS_SF | X86_EFLAGS_TF |   \
0142                   X86_EFLAGS_DF | X86_EFLAGS_OF |   \
0143                   X86_EFLAGS_RF | X86_EFLAGS_AC))
0144 
0145 /*
0146  * Determines whether a value may be installed in a segment register.
0147  */
0148 static inline bool invalid_selector(u16 value)
0149 {
0150     return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
0151 }
0152 
0153 #ifdef CONFIG_X86_32
0154 
0155 #define FLAG_MASK       FLAG_MASK_32
0156 
0157 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
0158 {
0159     BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
0160     return &regs->bx + (regno >> 2);
0161 }
0162 
0163 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
0164 {
0165     /*
0166      * Returning the value truncates it to 16 bits.
0167      */
0168     unsigned int retval;
0169     if (offset != offsetof(struct user_regs_struct, gs))
0170         retval = *pt_regs_access(task_pt_regs(task), offset);
0171     else {
0172         if (task == current)
0173             savesegment(gs, retval);
0174         else
0175             retval = task->thread.gs;
0176     }
0177     return retval;
0178 }
0179 
0180 static int set_segment_reg(struct task_struct *task,
0181                unsigned long offset, u16 value)
0182 {
0183     if (WARN_ON_ONCE(task == current))
0184         return -EIO;
0185 
0186     /*
0187      * The value argument was already truncated to 16 bits.
0188      */
0189     if (invalid_selector(value))
0190         return -EIO;
0191 
0192     /*
0193      * For %cs and %ss we cannot permit a null selector.
0194      * We can permit a bogus selector as long as it has USER_RPL.
0195      * Null selectors are fine for other segment registers, but
0196      * we will never get back to user mode with invalid %cs or %ss
0197      * and will take the trap in iret instead.  Much code relies
0198      * on user_mode() to distinguish a user trap frame (which can
0199      * safely use invalid selectors) from a kernel trap frame.
0200      */
0201     switch (offset) {
0202     case offsetof(struct user_regs_struct, cs):
0203     case offsetof(struct user_regs_struct, ss):
0204         if (unlikely(value == 0))
0205             return -EIO;
0206         fallthrough;
0207 
0208     default:
0209         *pt_regs_access(task_pt_regs(task), offset) = value;
0210         break;
0211 
0212     case offsetof(struct user_regs_struct, gs):
0213         task->thread.gs = value;
0214     }
0215 
0216     return 0;
0217 }
0218 
0219 #else  /* CONFIG_X86_64 */
0220 
0221 #define FLAG_MASK       (FLAG_MASK_32 | X86_EFLAGS_NT)
0222 
0223 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
0224 {
0225     BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
0226     return &regs->r15 + (offset / sizeof(regs->r15));
0227 }
0228 
0229 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
0230 {
0231     /*
0232      * Returning the value truncates it to 16 bits.
0233      */
0234     unsigned int seg;
0235 
0236     switch (offset) {
0237     case offsetof(struct user_regs_struct, fs):
0238         if (task == current) {
0239             /* Older gas can't assemble movq %?s,%r?? */
0240             asm("movl %%fs,%0" : "=r" (seg));
0241             return seg;
0242         }
0243         return task->thread.fsindex;
0244     case offsetof(struct user_regs_struct, gs):
0245         if (task == current) {
0246             asm("movl %%gs,%0" : "=r" (seg));
0247             return seg;
0248         }
0249         return task->thread.gsindex;
0250     case offsetof(struct user_regs_struct, ds):
0251         if (task == current) {
0252             asm("movl %%ds,%0" : "=r" (seg));
0253             return seg;
0254         }
0255         return task->thread.ds;
0256     case offsetof(struct user_regs_struct, es):
0257         if (task == current) {
0258             asm("movl %%es,%0" : "=r" (seg));
0259             return seg;
0260         }
0261         return task->thread.es;
0262 
0263     case offsetof(struct user_regs_struct, cs):
0264     case offsetof(struct user_regs_struct, ss):
0265         break;
0266     }
0267     return *pt_regs_access(task_pt_regs(task), offset);
0268 }
0269 
0270 static int set_segment_reg(struct task_struct *task,
0271                unsigned long offset, u16 value)
0272 {
0273     if (WARN_ON_ONCE(task == current))
0274         return -EIO;
0275 
0276     /*
0277      * The value argument was already truncated to 16 bits.
0278      */
0279     if (invalid_selector(value))
0280         return -EIO;
0281 
0282     /*
0283      * Writes to FS and GS will change the stored selector.  Whether
0284      * this changes the segment base as well depends on whether
0285      * FSGSBASE is enabled.
0286      */
0287 
0288     switch (offset) {
0289     case offsetof(struct user_regs_struct,fs):
0290         task->thread.fsindex = value;
0291         break;
0292     case offsetof(struct user_regs_struct,gs):
0293         task->thread.gsindex = value;
0294         break;
0295     case offsetof(struct user_regs_struct,ds):
0296         task->thread.ds = value;
0297         break;
0298     case offsetof(struct user_regs_struct,es):
0299         task->thread.es = value;
0300         break;
0301 
0302         /*
0303          * Can't actually change these in 64-bit mode.
0304          */
0305     case offsetof(struct user_regs_struct,cs):
0306         if (unlikely(value == 0))
0307             return -EIO;
0308         task_pt_regs(task)->cs = value;
0309         break;
0310     case offsetof(struct user_regs_struct,ss):
0311         if (unlikely(value == 0))
0312             return -EIO;
0313         task_pt_regs(task)->ss = value;
0314         break;
0315     }
0316 
0317     return 0;
0318 }
0319 
0320 #endif  /* CONFIG_X86_32 */
0321 
0322 static unsigned long get_flags(struct task_struct *task)
0323 {
0324     unsigned long retval = task_pt_regs(task)->flags;
0325 
0326     /*
0327      * If the debugger set TF, hide it from the readout.
0328      */
0329     if (test_tsk_thread_flag(task, TIF_FORCED_TF))
0330         retval &= ~X86_EFLAGS_TF;
0331 
0332     return retval;
0333 }
0334 
0335 static int set_flags(struct task_struct *task, unsigned long value)
0336 {
0337     struct pt_regs *regs = task_pt_regs(task);
0338 
0339     /*
0340      * If the user value contains TF, mark that
0341      * it was not "us" (the debugger) that set it.
0342      * If not, make sure it stays set if we had.
0343      */
0344     if (value & X86_EFLAGS_TF)
0345         clear_tsk_thread_flag(task, TIF_FORCED_TF);
0346     else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
0347         value |= X86_EFLAGS_TF;
0348 
0349     regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
0350 
0351     return 0;
0352 }
0353 
0354 static int putreg(struct task_struct *child,
0355           unsigned long offset, unsigned long value)
0356 {
0357     switch (offset) {
0358     case offsetof(struct user_regs_struct, cs):
0359     case offsetof(struct user_regs_struct, ds):
0360     case offsetof(struct user_regs_struct, es):
0361     case offsetof(struct user_regs_struct, fs):
0362     case offsetof(struct user_regs_struct, gs):
0363     case offsetof(struct user_regs_struct, ss):
0364         return set_segment_reg(child, offset, value);
0365 
0366     case offsetof(struct user_regs_struct, flags):
0367         return set_flags(child, value);
0368 
0369 #ifdef CONFIG_X86_64
0370     case offsetof(struct user_regs_struct,fs_base):
0371         if (value >= TASK_SIZE_MAX)
0372             return -EIO;
0373         x86_fsbase_write_task(child, value);
0374         return 0;
0375     case offsetof(struct user_regs_struct,gs_base):
0376         if (value >= TASK_SIZE_MAX)
0377             return -EIO;
0378         x86_gsbase_write_task(child, value);
0379         return 0;
0380 #endif
0381     }
0382 
0383     *pt_regs_access(task_pt_regs(child), offset) = value;
0384     return 0;
0385 }
0386 
0387 static unsigned long getreg(struct task_struct *task, unsigned long offset)
0388 {
0389     switch (offset) {
0390     case offsetof(struct user_regs_struct, cs):
0391     case offsetof(struct user_regs_struct, ds):
0392     case offsetof(struct user_regs_struct, es):
0393     case offsetof(struct user_regs_struct, fs):
0394     case offsetof(struct user_regs_struct, gs):
0395     case offsetof(struct user_regs_struct, ss):
0396         return get_segment_reg(task, offset);
0397 
0398     case offsetof(struct user_regs_struct, flags):
0399         return get_flags(task);
0400 
0401 #ifdef CONFIG_X86_64
0402     case offsetof(struct user_regs_struct, fs_base):
0403         return x86_fsbase_read_task(task);
0404     case offsetof(struct user_regs_struct, gs_base):
0405         return x86_gsbase_read_task(task);
0406 #endif
0407     }
0408 
0409     return *pt_regs_access(task_pt_regs(task), offset);
0410 }
0411 
0412 static int genregs_get(struct task_struct *target,
0413                const struct user_regset *regset,
0414                struct membuf to)
0415 {
0416     int reg;
0417 
0418     for (reg = 0; to.left; reg++)
0419         membuf_store(&to, getreg(target, reg * sizeof(unsigned long)));
0420     return 0;
0421 }
0422 
0423 static int genregs_set(struct task_struct *target,
0424                const struct user_regset *regset,
0425                unsigned int pos, unsigned int count,
0426                const void *kbuf, const void __user *ubuf)
0427 {
0428     int ret = 0;
0429     if (kbuf) {
0430         const unsigned long *k = kbuf;
0431         while (count >= sizeof(*k) && !ret) {
0432             ret = putreg(target, pos, *k++);
0433             count -= sizeof(*k);
0434             pos += sizeof(*k);
0435         }
0436     } else {
0437         const unsigned long  __user *u = ubuf;
0438         while (count >= sizeof(*u) && !ret) {
0439             unsigned long word;
0440             ret = __get_user(word, u++);
0441             if (ret)
0442                 break;
0443             ret = putreg(target, pos, word);
0444             count -= sizeof(*u);
0445             pos += sizeof(*u);
0446         }
0447     }
0448     return ret;
0449 }
0450 
0451 static void ptrace_triggered(struct perf_event *bp,
0452                  struct perf_sample_data *data,
0453                  struct pt_regs *regs)
0454 {
0455     int i;
0456     struct thread_struct *thread = &(current->thread);
0457 
0458     /*
0459      * Store in the virtual DR6 register the fact that the breakpoint
0460      * was hit so the thread's debugger will see it.
0461      */
0462     for (i = 0; i < HBP_NUM; i++) {
0463         if (thread->ptrace_bps[i] == bp)
0464             break;
0465     }
0466 
0467     thread->virtual_dr6 |= (DR_TRAP0 << i);
0468 }
0469 
0470 /*
0471  * Walk through every ptrace breakpoints for this thread and
0472  * build the dr7 value on top of their attributes.
0473  *
0474  */
0475 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
0476 {
0477     int i;
0478     int dr7 = 0;
0479     struct arch_hw_breakpoint *info;
0480 
0481     for (i = 0; i < HBP_NUM; i++) {
0482         if (bp[i] && !bp[i]->attr.disabled) {
0483             info = counter_arch_bp(bp[i]);
0484             dr7 |= encode_dr7(i, info->len, info->type);
0485         }
0486     }
0487 
0488     return dr7;
0489 }
0490 
0491 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
0492                     int len, int type, bool disabled)
0493 {
0494     int err, bp_len, bp_type;
0495 
0496     err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
0497     if (!err) {
0498         attr->bp_len = bp_len;
0499         attr->bp_type = bp_type;
0500         attr->disabled = disabled;
0501     }
0502 
0503     return err;
0504 }
0505 
0506 static struct perf_event *
0507 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
0508                 unsigned long addr, bool disabled)
0509 {
0510     struct perf_event_attr attr;
0511     int err;
0512 
0513     ptrace_breakpoint_init(&attr);
0514     attr.bp_addr = addr;
0515 
0516     err = ptrace_fill_bp_fields(&attr, len, type, disabled);
0517     if (err)
0518         return ERR_PTR(err);
0519 
0520     return register_user_hw_breakpoint(&attr, ptrace_triggered,
0521                          NULL, tsk);
0522 }
0523 
0524 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
0525                     int disabled)
0526 {
0527     struct perf_event_attr attr = bp->attr;
0528     int err;
0529 
0530     err = ptrace_fill_bp_fields(&attr, len, type, disabled);
0531     if (err)
0532         return err;
0533 
0534     return modify_user_hw_breakpoint(bp, &attr);
0535 }
0536 
0537 /*
0538  * Handle ptrace writes to debug register 7.
0539  */
0540 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
0541 {
0542     struct thread_struct *thread = &tsk->thread;
0543     unsigned long old_dr7;
0544     bool second_pass = false;
0545     int i, rc, ret = 0;
0546 
0547     data &= ~DR_CONTROL_RESERVED;
0548     old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
0549 
0550 restore:
0551     rc = 0;
0552     for (i = 0; i < HBP_NUM; i++) {
0553         unsigned len, type;
0554         bool disabled = !decode_dr7(data, i, &len, &type);
0555         struct perf_event *bp = thread->ptrace_bps[i];
0556 
0557         if (!bp) {
0558             if (disabled)
0559                 continue;
0560 
0561             bp = ptrace_register_breakpoint(tsk,
0562                     len, type, 0, disabled);
0563             if (IS_ERR(bp)) {
0564                 rc = PTR_ERR(bp);
0565                 break;
0566             }
0567 
0568             thread->ptrace_bps[i] = bp;
0569             continue;
0570         }
0571 
0572         rc = ptrace_modify_breakpoint(bp, len, type, disabled);
0573         if (rc)
0574             break;
0575     }
0576 
0577     /* Restore if the first pass failed, second_pass shouldn't fail. */
0578     if (rc && !WARN_ON(second_pass)) {
0579         ret = rc;
0580         data = old_dr7;
0581         second_pass = true;
0582         goto restore;
0583     }
0584 
0585     return ret;
0586 }
0587 
0588 /*
0589  * Handle PTRACE_PEEKUSR calls for the debug register area.
0590  */
0591 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
0592 {
0593     struct thread_struct *thread = &tsk->thread;
0594     unsigned long val = 0;
0595 
0596     if (n < HBP_NUM) {
0597         int index = array_index_nospec(n, HBP_NUM);
0598         struct perf_event *bp = thread->ptrace_bps[index];
0599 
0600         if (bp)
0601             val = bp->hw.info.address;
0602     } else if (n == 6) {
0603         val = thread->virtual_dr6 ^ DR6_RESERVED; /* Flip back to arch polarity */
0604     } else if (n == 7) {
0605         val = thread->ptrace_dr7;
0606     }
0607     return val;
0608 }
0609 
0610 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
0611                       unsigned long addr)
0612 {
0613     struct thread_struct *t = &tsk->thread;
0614     struct perf_event *bp = t->ptrace_bps[nr];
0615     int err = 0;
0616 
0617     if (!bp) {
0618         /*
0619          * Put stub len and type to create an inactive but correct bp.
0620          *
0621          * CHECKME: the previous code returned -EIO if the addr wasn't
0622          * a valid task virtual addr. The new one will return -EINVAL in
0623          *  this case.
0624          * -EINVAL may be what we want for in-kernel breakpoints users,
0625          * but -EIO looks better for ptrace, since we refuse a register
0626          * writing for the user. And anyway this is the previous
0627          * behaviour.
0628          */
0629         bp = ptrace_register_breakpoint(tsk,
0630                 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
0631                 addr, true);
0632         if (IS_ERR(bp))
0633             err = PTR_ERR(bp);
0634         else
0635             t->ptrace_bps[nr] = bp;
0636     } else {
0637         struct perf_event_attr attr = bp->attr;
0638 
0639         attr.bp_addr = addr;
0640         err = modify_user_hw_breakpoint(bp, &attr);
0641     }
0642 
0643     return err;
0644 }
0645 
0646 /*
0647  * Handle PTRACE_POKEUSR calls for the debug register area.
0648  */
0649 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
0650                    unsigned long val)
0651 {
0652     struct thread_struct *thread = &tsk->thread;
0653     /* There are no DR4 or DR5 registers */
0654     int rc = -EIO;
0655 
0656     if (n < HBP_NUM) {
0657         rc = ptrace_set_breakpoint_addr(tsk, n, val);
0658     } else if (n == 6) {
0659         thread->virtual_dr6 = val ^ DR6_RESERVED; /* Flip to positive polarity */
0660         rc = 0;
0661     } else if (n == 7) {
0662         rc = ptrace_write_dr7(tsk, val);
0663         if (!rc)
0664             thread->ptrace_dr7 = val;
0665     }
0666     return rc;
0667 }
0668 
0669 /*
0670  * These access the current or another (stopped) task's io permission
0671  * bitmap for debugging or core dump.
0672  */
0673 static int ioperm_active(struct task_struct *target,
0674              const struct user_regset *regset)
0675 {
0676     struct io_bitmap *iobm = target->thread.io_bitmap;
0677 
0678     return iobm ? DIV_ROUND_UP(iobm->max, regset->size) : 0;
0679 }
0680 
0681 static int ioperm_get(struct task_struct *target,
0682               const struct user_regset *regset,
0683               struct membuf to)
0684 {
0685     struct io_bitmap *iobm = target->thread.io_bitmap;
0686 
0687     if (!iobm)
0688         return -ENXIO;
0689 
0690     return membuf_write(&to, iobm->bitmap, IO_BITMAP_BYTES);
0691 }
0692 
0693 /*
0694  * Called by kernel/ptrace.c when detaching..
0695  *
0696  * Make sure the single step bit is not set.
0697  */
0698 void ptrace_disable(struct task_struct *child)
0699 {
0700     user_disable_single_step(child);
0701 }
0702 
0703 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
0704 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
0705 #endif
0706 #ifdef CONFIG_X86_64
0707 static const struct user_regset_view user_x86_64_view; /* Initialized below. */
0708 #endif
0709 
0710 long arch_ptrace(struct task_struct *child, long request,
0711          unsigned long addr, unsigned long data)
0712 {
0713     int ret;
0714     unsigned long __user *datap = (unsigned long __user *)data;
0715 
0716 #ifdef CONFIG_X86_64
0717     /* This is native 64-bit ptrace() */
0718     const struct user_regset_view *regset_view = &user_x86_64_view;
0719 #else
0720     /* This is native 32-bit ptrace() */
0721     const struct user_regset_view *regset_view = &user_x86_32_view;
0722 #endif
0723 
0724     switch (request) {
0725     /* read the word at location addr in the USER area. */
0726     case PTRACE_PEEKUSR: {
0727         unsigned long tmp;
0728 
0729         ret = -EIO;
0730         if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
0731             break;
0732 
0733         tmp = 0;  /* Default return condition */
0734         if (addr < sizeof(struct user_regs_struct))
0735             tmp = getreg(child, addr);
0736         else if (addr >= offsetof(struct user, u_debugreg[0]) &&
0737              addr <= offsetof(struct user, u_debugreg[7])) {
0738             addr -= offsetof(struct user, u_debugreg[0]);
0739             tmp = ptrace_get_debugreg(child, addr / sizeof(data));
0740         }
0741         ret = put_user(tmp, datap);
0742         break;
0743     }
0744 
0745     case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
0746         ret = -EIO;
0747         if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
0748             break;
0749 
0750         if (addr < sizeof(struct user_regs_struct))
0751             ret = putreg(child, addr, data);
0752         else if (addr >= offsetof(struct user, u_debugreg[0]) &&
0753              addr <= offsetof(struct user, u_debugreg[7])) {
0754             addr -= offsetof(struct user, u_debugreg[0]);
0755             ret = ptrace_set_debugreg(child,
0756                           addr / sizeof(data), data);
0757         }
0758         break;
0759 
0760     case PTRACE_GETREGS:    /* Get all gp regs from the child. */
0761         return copy_regset_to_user(child,
0762                        regset_view,
0763                        REGSET_GENERAL,
0764                        0, sizeof(struct user_regs_struct),
0765                        datap);
0766 
0767     case PTRACE_SETREGS:    /* Set all gp regs in the child. */
0768         return copy_regset_from_user(child,
0769                          regset_view,
0770                          REGSET_GENERAL,
0771                          0, sizeof(struct user_regs_struct),
0772                          datap);
0773 
0774     case PTRACE_GETFPREGS:  /* Get the child FPU state. */
0775         return copy_regset_to_user(child,
0776                        regset_view,
0777                        REGSET_FP,
0778                        0, sizeof(struct user_i387_struct),
0779                        datap);
0780 
0781     case PTRACE_SETFPREGS:  /* Set the child FPU state. */
0782         return copy_regset_from_user(child,
0783                          regset_view,
0784                          REGSET_FP,
0785                          0, sizeof(struct user_i387_struct),
0786                          datap);
0787 
0788 #ifdef CONFIG_X86_32
0789     case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
0790         return copy_regset_to_user(child, &user_x86_32_view,
0791                        REGSET_XFP,
0792                        0, sizeof(struct user_fxsr_struct),
0793                        datap) ? -EIO : 0;
0794 
0795     case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
0796         return copy_regset_from_user(child, &user_x86_32_view,
0797                          REGSET_XFP,
0798                          0, sizeof(struct user_fxsr_struct),
0799                          datap) ? -EIO : 0;
0800 #endif
0801 
0802 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
0803     case PTRACE_GET_THREAD_AREA:
0804         if ((int) addr < 0)
0805             return -EIO;
0806         ret = do_get_thread_area(child, addr,
0807                     (struct user_desc __user *)data);
0808         break;
0809 
0810     case PTRACE_SET_THREAD_AREA:
0811         if ((int) addr < 0)
0812             return -EIO;
0813         ret = do_set_thread_area(child, addr,
0814                     (struct user_desc __user *)data, 0);
0815         break;
0816 #endif
0817 
0818 #ifdef CONFIG_X86_64
0819         /* normal 64bit interface to access TLS data.
0820            Works just like arch_prctl, except that the arguments
0821            are reversed. */
0822     case PTRACE_ARCH_PRCTL:
0823         ret = do_arch_prctl_64(child, data, addr);
0824         break;
0825 #endif
0826 
0827     default:
0828         ret = ptrace_request(child, request, addr, data);
0829         break;
0830     }
0831 
0832     return ret;
0833 }
0834 
0835 #ifdef CONFIG_IA32_EMULATION
0836 
0837 #include <linux/compat.h>
0838 #include <linux/syscalls.h>
0839 #include <asm/ia32.h>
0840 #include <asm/user32.h>
0841 
0842 #define R32(l,q)                            \
0843     case offsetof(struct user32, regs.l):               \
0844         regs->q = value; break
0845 
0846 #define SEG32(rs)                           \
0847     case offsetof(struct user32, regs.rs):              \
0848         return set_segment_reg(child,               \
0849                        offsetof(struct user_regs_struct, rs), \
0850                        value);              \
0851         break
0852 
0853 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
0854 {
0855     struct pt_regs *regs = task_pt_regs(child);
0856     int ret;
0857 
0858     switch (regno) {
0859 
0860     SEG32(cs);
0861     SEG32(ds);
0862     SEG32(es);
0863 
0864     /*
0865      * A 32-bit ptracer on a 64-bit kernel expects that writing
0866      * FS or GS will also update the base.  This is needed for
0867      * operations like PTRACE_SETREGS to fully restore a saved
0868      * CPU state.
0869      */
0870 
0871     case offsetof(struct user32, regs.fs):
0872         ret = set_segment_reg(child,
0873                       offsetof(struct user_regs_struct, fs),
0874                       value);
0875         if (ret == 0)
0876             child->thread.fsbase =
0877                 x86_fsgsbase_read_task(child, value);
0878         return ret;
0879 
0880     case offsetof(struct user32, regs.gs):
0881         ret = set_segment_reg(child,
0882                       offsetof(struct user_regs_struct, gs),
0883                       value);
0884         if (ret == 0)
0885             child->thread.gsbase =
0886                 x86_fsgsbase_read_task(child, value);
0887         return ret;
0888 
0889     SEG32(ss);
0890 
0891     R32(ebx, bx);
0892     R32(ecx, cx);
0893     R32(edx, dx);
0894     R32(edi, di);
0895     R32(esi, si);
0896     R32(ebp, bp);
0897     R32(eax, ax);
0898     R32(eip, ip);
0899     R32(esp, sp);
0900 
0901     case offsetof(struct user32, regs.orig_eax):
0902         /*
0903          * Warning: bizarre corner case fixup here.  A 32-bit
0904          * debugger setting orig_eax to -1 wants to disable
0905          * syscall restart.  Make sure that the syscall
0906          * restart code sign-extends orig_ax.  Also make sure
0907          * we interpret the -ERESTART* codes correctly if
0908          * loaded into regs->ax in case the task is not
0909          * actually still sitting at the exit from a 32-bit
0910          * syscall with TS_COMPAT still set.
0911          */
0912         regs->orig_ax = value;
0913         if (syscall_get_nr(child, regs) != -1)
0914             child->thread_info.status |= TS_I386_REGS_POKED;
0915         break;
0916 
0917     case offsetof(struct user32, regs.eflags):
0918         return set_flags(child, value);
0919 
0920     case offsetof(struct user32, u_debugreg[0]) ...
0921         offsetof(struct user32, u_debugreg[7]):
0922         regno -= offsetof(struct user32, u_debugreg[0]);
0923         return ptrace_set_debugreg(child, regno / 4, value);
0924 
0925     default:
0926         if (regno > sizeof(struct user32) || (regno & 3))
0927             return -EIO;
0928 
0929         /*
0930          * Other dummy fields in the virtual user structure
0931          * are ignored
0932          */
0933         break;
0934     }
0935     return 0;
0936 }
0937 
0938 #undef R32
0939 #undef SEG32
0940 
0941 #define R32(l,q)                            \
0942     case offsetof(struct user32, regs.l):               \
0943         *val = regs->q; break
0944 
0945 #define SEG32(rs)                           \
0946     case offsetof(struct user32, regs.rs):              \
0947         *val = get_segment_reg(child,               \
0948                        offsetof(struct user_regs_struct, rs)); \
0949         break
0950 
0951 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
0952 {
0953     struct pt_regs *regs = task_pt_regs(child);
0954 
0955     switch (regno) {
0956 
0957     SEG32(ds);
0958     SEG32(es);
0959     SEG32(fs);
0960     SEG32(gs);
0961 
0962     R32(cs, cs);
0963     R32(ss, ss);
0964     R32(ebx, bx);
0965     R32(ecx, cx);
0966     R32(edx, dx);
0967     R32(edi, di);
0968     R32(esi, si);
0969     R32(ebp, bp);
0970     R32(eax, ax);
0971     R32(orig_eax, orig_ax);
0972     R32(eip, ip);
0973     R32(esp, sp);
0974 
0975     case offsetof(struct user32, regs.eflags):
0976         *val = get_flags(child);
0977         break;
0978 
0979     case offsetof(struct user32, u_debugreg[0]) ...
0980         offsetof(struct user32, u_debugreg[7]):
0981         regno -= offsetof(struct user32, u_debugreg[0]);
0982         *val = ptrace_get_debugreg(child, regno / 4);
0983         break;
0984 
0985     default:
0986         if (regno > sizeof(struct user32) || (regno & 3))
0987             return -EIO;
0988 
0989         /*
0990          * Other dummy fields in the virtual user structure
0991          * are ignored
0992          */
0993         *val = 0;
0994         break;
0995     }
0996     return 0;
0997 }
0998 
0999 #undef R32
1000 #undef SEG32
1001 
1002 static int genregs32_get(struct task_struct *target,
1003              const struct user_regset *regset,
1004              struct membuf to)
1005 {
1006     int reg;
1007 
1008     for (reg = 0; to.left; reg++) {
1009         u32 val;
1010         getreg32(target, reg * 4, &val);
1011         membuf_store(&to, val);
1012     }
1013     return 0;
1014 }
1015 
1016 static int genregs32_set(struct task_struct *target,
1017              const struct user_regset *regset,
1018              unsigned int pos, unsigned int count,
1019              const void *kbuf, const void __user *ubuf)
1020 {
1021     int ret = 0;
1022     if (kbuf) {
1023         const compat_ulong_t *k = kbuf;
1024         while (count >= sizeof(*k) && !ret) {
1025             ret = putreg32(target, pos, *k++);
1026             count -= sizeof(*k);
1027             pos += sizeof(*k);
1028         }
1029     } else {
1030         const compat_ulong_t __user *u = ubuf;
1031         while (count >= sizeof(*u) && !ret) {
1032             compat_ulong_t word;
1033             ret = __get_user(word, u++);
1034             if (ret)
1035                 break;
1036             ret = putreg32(target, pos, word);
1037             count -= sizeof(*u);
1038             pos += sizeof(*u);
1039         }
1040     }
1041     return ret;
1042 }
1043 
1044 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1045                  compat_ulong_t caddr, compat_ulong_t cdata)
1046 {
1047     unsigned long addr = caddr;
1048     unsigned long data = cdata;
1049     void __user *datap = compat_ptr(data);
1050     int ret;
1051     __u32 val;
1052 
1053     switch (request) {
1054     case PTRACE_PEEKUSR:
1055         ret = getreg32(child, addr, &val);
1056         if (ret == 0)
1057             ret = put_user(val, (__u32 __user *)datap);
1058         break;
1059 
1060     case PTRACE_POKEUSR:
1061         ret = putreg32(child, addr, data);
1062         break;
1063 
1064     case PTRACE_GETREGS:    /* Get all gp regs from the child. */
1065         return copy_regset_to_user(child, &user_x86_32_view,
1066                        REGSET_GENERAL,
1067                        0, sizeof(struct user_regs_struct32),
1068                        datap);
1069 
1070     case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1071         return copy_regset_from_user(child, &user_x86_32_view,
1072                          REGSET_GENERAL, 0,
1073                          sizeof(struct user_regs_struct32),
1074                          datap);
1075 
1076     case PTRACE_GETFPREGS:  /* Get the child FPU state. */
1077         return copy_regset_to_user(child, &user_x86_32_view,
1078                        REGSET_FP, 0,
1079                        sizeof(struct user_i387_ia32_struct),
1080                        datap);
1081 
1082     case PTRACE_SETFPREGS:  /* Set the child FPU state. */
1083         return copy_regset_from_user(
1084             child, &user_x86_32_view, REGSET_FP,
1085             0, sizeof(struct user_i387_ia32_struct), datap);
1086 
1087     case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1088         return copy_regset_to_user(child, &user_x86_32_view,
1089                        REGSET_XFP, 0,
1090                        sizeof(struct user32_fxsr_struct),
1091                        datap);
1092 
1093     case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1094         return copy_regset_from_user(child, &user_x86_32_view,
1095                          REGSET_XFP, 0,
1096                          sizeof(struct user32_fxsr_struct),
1097                          datap);
1098 
1099     case PTRACE_GET_THREAD_AREA:
1100     case PTRACE_SET_THREAD_AREA:
1101         return arch_ptrace(child, request, addr, data);
1102 
1103     default:
1104         return compat_ptrace_request(child, request, addr, data);
1105     }
1106 
1107     return ret;
1108 }
1109 #endif /* CONFIG_IA32_EMULATION */
1110 
1111 #ifdef CONFIG_X86_X32_ABI
1112 static long x32_arch_ptrace(struct task_struct *child,
1113                 compat_long_t request, compat_ulong_t caddr,
1114                 compat_ulong_t cdata)
1115 {
1116     unsigned long addr = caddr;
1117     unsigned long data = cdata;
1118     void __user *datap = compat_ptr(data);
1119     int ret;
1120 
1121     switch (request) {
1122     /* Read 32bits at location addr in the USER area.  Only allow
1123        to return the lower 32bits of segment and debug registers.  */
1124     case PTRACE_PEEKUSR: {
1125         u32 tmp;
1126 
1127         ret = -EIO;
1128         if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1129             addr < offsetof(struct user_regs_struct, cs))
1130             break;
1131 
1132         tmp = 0;  /* Default return condition */
1133         if (addr < sizeof(struct user_regs_struct))
1134             tmp = getreg(child, addr);
1135         else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1136              addr <= offsetof(struct user, u_debugreg[7])) {
1137             addr -= offsetof(struct user, u_debugreg[0]);
1138             tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1139         }
1140         ret = put_user(tmp, (__u32 __user *)datap);
1141         break;
1142     }
1143 
1144     /* Write the word at location addr in the USER area.  Only allow
1145        to update segment and debug registers with the upper 32bits
1146        zero-extended. */
1147     case PTRACE_POKEUSR:
1148         ret = -EIO;
1149         if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1150             addr < offsetof(struct user_regs_struct, cs))
1151             break;
1152 
1153         if (addr < sizeof(struct user_regs_struct))
1154             ret = putreg(child, addr, data);
1155         else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1156              addr <= offsetof(struct user, u_debugreg[7])) {
1157             addr -= offsetof(struct user, u_debugreg[0]);
1158             ret = ptrace_set_debugreg(child,
1159                           addr / sizeof(data), data);
1160         }
1161         break;
1162 
1163     case PTRACE_GETREGS:    /* Get all gp regs from the child. */
1164         return copy_regset_to_user(child,
1165                        &user_x86_64_view,
1166                        REGSET_GENERAL,
1167                        0, sizeof(struct user_regs_struct),
1168                        datap);
1169 
1170     case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1171         return copy_regset_from_user(child,
1172                          &user_x86_64_view,
1173                          REGSET_GENERAL,
1174                          0, sizeof(struct user_regs_struct),
1175                          datap);
1176 
1177     case PTRACE_GETFPREGS:  /* Get the child FPU state. */
1178         return copy_regset_to_user(child,
1179                        &user_x86_64_view,
1180                        REGSET_FP,
1181                        0, sizeof(struct user_i387_struct),
1182                        datap);
1183 
1184     case PTRACE_SETFPREGS:  /* Set the child FPU state. */
1185         return copy_regset_from_user(child,
1186                          &user_x86_64_view,
1187                          REGSET_FP,
1188                          0, sizeof(struct user_i387_struct),
1189                          datap);
1190 
1191     default:
1192         return compat_ptrace_request(child, request, addr, data);
1193     }
1194 
1195     return ret;
1196 }
1197 #endif
1198 
1199 #ifdef CONFIG_COMPAT
1200 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1201             compat_ulong_t caddr, compat_ulong_t cdata)
1202 {
1203 #ifdef CONFIG_X86_X32_ABI
1204     if (!in_ia32_syscall())
1205         return x32_arch_ptrace(child, request, caddr, cdata);
1206 #endif
1207 #ifdef CONFIG_IA32_EMULATION
1208     return ia32_arch_ptrace(child, request, caddr, cdata);
1209 #else
1210     return 0;
1211 #endif
1212 }
1213 #endif  /* CONFIG_COMPAT */
1214 
1215 #ifdef CONFIG_X86_64
1216 
1217 static struct user_regset x86_64_regsets[] __ro_after_init = {
1218     [REGSET_GENERAL] = {
1219         .core_note_type = NT_PRSTATUS,
1220         .n = sizeof(struct user_regs_struct) / sizeof(long),
1221         .size = sizeof(long), .align = sizeof(long),
1222         .regset_get = genregs_get, .set = genregs_set
1223     },
1224     [REGSET_FP] = {
1225         .core_note_type = NT_PRFPREG,
1226         .n = sizeof(struct fxregs_state) / sizeof(long),
1227         .size = sizeof(long), .align = sizeof(long),
1228         .active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set
1229     },
1230     [REGSET_XSTATE] = {
1231         .core_note_type = NT_X86_XSTATE,
1232         .size = sizeof(u64), .align = sizeof(u64),
1233         .active = xstateregs_active, .regset_get = xstateregs_get,
1234         .set = xstateregs_set
1235     },
1236     [REGSET_IOPERM64] = {
1237         .core_note_type = NT_386_IOPERM,
1238         .n = IO_BITMAP_LONGS,
1239         .size = sizeof(long), .align = sizeof(long),
1240         .active = ioperm_active, .regset_get = ioperm_get
1241     },
1242 };
1243 
1244 static const struct user_regset_view user_x86_64_view = {
1245     .name = "x86_64", .e_machine = EM_X86_64,
1246     .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1247 };
1248 
1249 #else  /* CONFIG_X86_32 */
1250 
1251 #define user_regs_struct32  user_regs_struct
1252 #define genregs32_get       genregs_get
1253 #define genregs32_set       genregs_set
1254 
1255 #endif  /* CONFIG_X86_64 */
1256 
1257 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1258 static struct user_regset x86_32_regsets[] __ro_after_init = {
1259     [REGSET_GENERAL] = {
1260         .core_note_type = NT_PRSTATUS,
1261         .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1262         .size = sizeof(u32), .align = sizeof(u32),
1263         .regset_get = genregs32_get, .set = genregs32_set
1264     },
1265     [REGSET_FP] = {
1266         .core_note_type = NT_PRFPREG,
1267         .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1268         .size = sizeof(u32), .align = sizeof(u32),
1269         .active = regset_fpregs_active, .regset_get = fpregs_get, .set = fpregs_set
1270     },
1271     [REGSET_XFP] = {
1272         .core_note_type = NT_PRXFPREG,
1273         .n = sizeof(struct fxregs_state) / sizeof(u32),
1274         .size = sizeof(u32), .align = sizeof(u32),
1275         .active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set
1276     },
1277     [REGSET_XSTATE] = {
1278         .core_note_type = NT_X86_XSTATE,
1279         .size = sizeof(u64), .align = sizeof(u64),
1280         .active = xstateregs_active, .regset_get = xstateregs_get,
1281         .set = xstateregs_set
1282     },
1283     [REGSET_TLS] = {
1284         .core_note_type = NT_386_TLS,
1285         .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1286         .size = sizeof(struct user_desc),
1287         .align = sizeof(struct user_desc),
1288         .active = regset_tls_active,
1289         .regset_get = regset_tls_get, .set = regset_tls_set
1290     },
1291     [REGSET_IOPERM32] = {
1292         .core_note_type = NT_386_IOPERM,
1293         .n = IO_BITMAP_BYTES / sizeof(u32),
1294         .size = sizeof(u32), .align = sizeof(u32),
1295         .active = ioperm_active, .regset_get = ioperm_get
1296     },
1297 };
1298 
1299 static const struct user_regset_view user_x86_32_view = {
1300     .name = "i386", .e_machine = EM_386,
1301     .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1302 };
1303 #endif
1304 
1305 /*
1306  * This represents bytes 464..511 in the memory layout exported through
1307  * the REGSET_XSTATE interface.
1308  */
1309 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1310 
1311 void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1312 {
1313 #ifdef CONFIG_X86_64
1314     x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1315 #endif
1316 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1317     x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1318 #endif
1319     xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1320 }
1321 
1322 /*
1323  * This is used by the core dump code to decide which regset to dump.  The
1324  * core dump code writes out the resulting .e_machine and the corresponding
1325  * regsets.  This is suboptimal if the task is messing around with its CS.L
1326  * field, but at worst the core dump will end up missing some information.
1327  *
1328  * Unfortunately, it is also used by the broken PTRACE_GETREGSET and
1329  * PTRACE_SETREGSET APIs.  These APIs look at the .regsets field but have
1330  * no way to make sure that the e_machine they use matches the caller's
1331  * expectations.  The result is that the data format returned by
1332  * PTRACE_GETREGSET depends on the returned CS field (and even the offset
1333  * of the returned CS field depends on its value!) and the data format
1334  * accepted by PTRACE_SETREGSET is determined by the old CS value.  The
1335  * upshot is that it is basically impossible to use these APIs correctly.
1336  *
1337  * The best way to fix it in the long run would probably be to add new
1338  * improved ptrace() APIs to read and write registers reliably, possibly by
1339  * allowing userspace to select the ELF e_machine variant that they expect.
1340  */
1341 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1342 {
1343 #ifdef CONFIG_IA32_EMULATION
1344     if (!user_64bit_mode(task_pt_regs(task)))
1345 #endif
1346 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1347         return &user_x86_32_view;
1348 #endif
1349 #ifdef CONFIG_X86_64
1350     return &user_x86_64_view;
1351 #endif
1352 }
1353 
1354 void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1355 {
1356     struct task_struct *tsk = current;
1357 
1358     tsk->thread.trap_nr = X86_TRAP_DB;
1359     tsk->thread.error_code = error_code;
1360 
1361     /* Send us the fake SIGTRAP */
1362     force_sig_fault(SIGTRAP, si_code,
1363             user_mode(regs) ? (void __user *)regs->ip : NULL);
1364 }
1365 
1366 void user_single_step_report(struct pt_regs *regs)
1367 {
1368     send_sigtrap(regs, 0, TRAP_BRKPT);
1369 }
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