ptrace.c

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    1 /*
    2  * arch/score/kernel/ptrace.c
    3  *
    4  * Score Processor version.
    5  *
    6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
    7  *  Chen Liqin <liqin.chen@sunplusct.com>
    8  *  Lennox Wu <lennox.wu@sunplusct.com>
    9  *
   10  * This program is free software; you can redistribute it and/or modify
   11  * it under the terms of the GNU General Public License as published by
   12  * the Free Software Foundation; either version 2 of the License, or
   13  * (at your option) any later version.
   14  *
   15  * This program is distributed in the hope that it will be useful,
   16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18  * GNU General Public License for more details.
   19  *
   20  * You should have received a copy of the GNU General Public License
   21  * along with this program; if not, see the file COPYING, or write
   22  * to the Free Software Foundation, Inc.,
   23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   24  */
   25 
   26 #include <linux/elf.h>
   27 #include <linux/kernel.h>
   28 #include <linux/mm.h>
   29 #include <linux/ptrace.h>
   30 #include <linux/regset.h>
   31 
   32 #include <asm/uaccess.h>
   33 
   34 /*
   35  * retrieve the contents of SCORE userspace general registers
   36  */
   37 static int genregs_get(struct task_struct *target,
   38                        const struct user_regset *regset,
   39                        unsigned int pos, unsigned int count,
   40                        void *kbuf, void __user *ubuf)
   41 {
   42         const struct pt_regs *regs = task_pt_regs(target);
   43         int ret;
   44 
   45         /* skip 9 * sizeof(unsigned long) not use for pt_regs */
   46         ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
   47                                         0, offsetof(struct pt_regs, regs));
   48 
   49         /* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
   50         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
   51                                   regs->regs,
   52                                   offsetof(struct pt_regs, regs),
   53                                   offsetof(struct pt_regs, cp0_condition));
   54 
   55         if (!ret)
   56                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
   57                                                 sizeof(struct pt_regs), -1);
   58 
   59         return ret;
   60 }
   61 
   62 /*
   63  * update the contents of the SCORE userspace general registers
   64  */
   65 static int genregs_set(struct task_struct *target,
   66                        const struct user_regset *regset,
   67                        unsigned int pos, unsigned int count,
   68                        const void *kbuf, const void __user *ubuf)
   69 {
   70         struct pt_regs *regs = task_pt_regs(target);
   71         int ret;
   72 
   73         /* skip 9 * sizeof(unsigned long) */
   74         ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
   75                                         0, offsetof(struct pt_regs, regs));
   76 
   77         /* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
   78         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
   79                                   regs->regs,
   80                                   offsetof(struct pt_regs, regs),
   81                                   offsetof(struct pt_regs, cp0_condition));
   82 
   83         if (!ret)
   84                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
   85                                                 sizeof(struct pt_regs), -1);
   86 
   87         return ret;
   88 }
   89 
   90 /*
   91  * Define the register sets available on the score7 under Linux
   92  */
   93 enum score7_regset {
   94         REGSET_GENERAL,
   95 };
   96 
   97 static const struct user_regset score7_regsets[] = {
   98         [REGSET_GENERAL] = {
   99                 .core_note_type = NT_PRSTATUS,
  100                 .n              = ELF_NGREG,
  101                 .size           = sizeof(long),
  102                 .align          = sizeof(long),
  103                 .get            = genregs_get,
  104                 .set            = genregs_set,
  105         },
  106 };
  107 
  108 static const struct user_regset_view user_score_native_view = {
  109         .name           = "score7",
  110         .e_machine      = EM_SCORE7,
  111         .regsets        = score7_regsets,
  112         .n              = ARRAY_SIZE(score7_regsets),
  113 };
  114 
  115 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
  116 {
  117         return &user_score_native_view;
  118 }
  119 
  120 static int is_16bitinsn(unsigned long insn)
  121 {
  122         if ((insn & INSN32_MASK) == INSN32_MASK)
  123                 return 0;
  124         else
  125                 return 1;
  126 }
  127 
  128 int
  129 read_tsk_long(struct task_struct *child,
  130                 unsigned long addr, unsigned long *res)
  131 {
  132         int copied;
  133 
  134         copied = access_process_vm(child, addr, res, sizeof(*res), 0);
  135 
  136         return copied != sizeof(*res) ? -EIO : 0;
  137 }
  138 
  139 int
  140 read_tsk_short(struct task_struct *child,
  141                 unsigned long addr, unsigned short *res)
  142 {
  143         int copied;
  144 
  145         copied = access_process_vm(child, addr, res, sizeof(*res), 0);
  146 
  147         return copied != sizeof(*res) ? -EIO : 0;
  148 }
  149 
  150 static int
  151 write_tsk_short(struct task_struct *child,
  152                 unsigned long addr, unsigned short val)
  153 {
  154         int copied;
  155 
  156         copied = access_process_vm(child, addr, &val, sizeof(val), 1);
  157 
  158         return copied != sizeof(val) ? -EIO : 0;
  159 }
  160 
  161 static int
  162 write_tsk_long(struct task_struct *child,
  163                 unsigned long addr, unsigned long val)
  164 {
  165         int copied;
  166 
  167         copied = access_process_vm(child, addr, &val, sizeof(val), 1);
  168 
  169         return copied != sizeof(val) ? -EIO : 0;
  170 }
  171 
  172 void user_enable_single_step(struct task_struct *child)
  173 {
  174         /* far_epc is the target of branch */
  175         unsigned int epc, far_epc = 0;
  176         unsigned long epc_insn, far_epc_insn;
  177         int ninsn_type;                 /* next insn type 0=16b, 1=32b */
  178         unsigned int tmp, tmp2;
  179         struct pt_regs *regs = task_pt_regs(child);
  180         child->thread.single_step = 1;
  181         child->thread.ss_nextcnt = 1;
  182         epc = regs->cp0_epc;
  183 
  184         read_tsk_long(child, epc, &epc_insn);
  185 
  186         if (is_16bitinsn(epc_insn)) {
  187                 if ((epc_insn & J16M) == J16) {
  188                         tmp = epc_insn & 0xFFE;
  189                         epc = (epc & 0xFFFFF000) | tmp;
  190                 } else if ((epc_insn & B16M) == B16) {
  191                         child->thread.ss_nextcnt = 2;
  192                         tmp = (epc_insn & 0xFF) << 1;
  193                         tmp = tmp << 23;
  194                         tmp = (unsigned int)((int) tmp >> 23);
  195                         far_epc = epc + tmp;
  196                         epc += 2;
  197                 } else if ((epc_insn & BR16M) == BR16) {
  198                         child->thread.ss_nextcnt = 2;
  199                         tmp = (epc_insn >> 4) & 0xF;
  200                         far_epc = regs->regs[tmp];
  201                         epc += 2;
  202                 } else
  203                         epc += 2;
  204         } else {
  205                 if ((epc_insn & J32M) == J32) {
  206                         tmp = epc_insn & 0x03FFFFFE;
  207                         tmp2 = tmp & 0x7FFF;
  208                         tmp = (((tmp >> 16) & 0x3FF) << 15) | tmp2;
  209                         epc = (epc & 0xFFC00000) | tmp;
  210                 } else if ((epc_insn & B32M) == B32) {
  211                         child->thread.ss_nextcnt = 2;
  212                         tmp = epc_insn & 0x03FFFFFE;    /* discard LK bit */
  213                         tmp2 = tmp & 0x3FF;
  214                         tmp = (((tmp >> 16) & 0x3FF) << 10) | tmp2; /* 20bit */
  215                         tmp = tmp << 12;
  216                         tmp = (unsigned int)((int) tmp >> 12);
  217                         far_epc = epc + tmp;
  218                         epc += 4;
  219                 } else if ((epc_insn & BR32M) == BR32) {
  220                         child->thread.ss_nextcnt = 2;
  221                         tmp = (epc_insn >> 16) & 0x1F;
  222                         far_epc = regs->regs[tmp];
  223                         epc += 4;
  224                 } else
  225                         epc += 4;
  226         }
  227 
  228         if (child->thread.ss_nextcnt == 1) {
  229                 read_tsk_long(child, epc, &epc_insn);
  230 
  231                 if (is_16bitinsn(epc_insn)) {
  232                         write_tsk_short(child, epc, SINGLESTEP16_INSN);
  233                         ninsn_type = 0;
  234                 } else {
  235                         write_tsk_long(child, epc, SINGLESTEP32_INSN);
  236                         ninsn_type = 1;
  237                 }
  238 
  239                 if (ninsn_type == 0) {  /* 16bits */
  240                         child->thread.insn1_type = 0;
  241                         child->thread.addr1 = epc;
  242                          /* the insn may have 32bit data */
  243                         child->thread.insn1 = (short)epc_insn;
  244                 } else {
  245                         child->thread.insn1_type = 1;
  246                         child->thread.addr1 = epc;
  247                         child->thread.insn1 = epc_insn;
  248                 }
  249         } else {
  250                 /* branch! have two target child->thread.ss_nextcnt=2 */
  251                 read_tsk_long(child, epc, &epc_insn);
  252                 read_tsk_long(child, far_epc, &far_epc_insn);
  253                 if (is_16bitinsn(epc_insn)) {
  254                         write_tsk_short(child, epc, SINGLESTEP16_INSN);
  255                         ninsn_type = 0;
  256                 } else {
  257                         write_tsk_long(child, epc, SINGLESTEP32_INSN);
  258                         ninsn_type = 1;
  259                 }
  260 
  261                 if (ninsn_type == 0) {  /* 16bits */
  262                         child->thread.insn1_type = 0;
  263                         child->thread.addr1 = epc;
  264                          /* the insn may have 32bit data */
  265                         child->thread.insn1 = (short)epc_insn;
  266                 } else {
  267                         child->thread.insn1_type = 1;
  268                         child->thread.addr1 = epc;
  269                         child->thread.insn1 = epc_insn;
  270                 }
  271 
  272                 if (is_16bitinsn(far_epc_insn)) {
  273                         write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
  274                         ninsn_type = 0;
  275                 } else {
  276                         write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
  277                         ninsn_type = 1;
  278                 }
  279 
  280                 if (ninsn_type == 0) {  /* 16bits */
  281                         child->thread.insn2_type = 0;
  282                         child->thread.addr2 = far_epc;
  283                          /* the insn may have 32bit data */
  284                         child->thread.insn2 = (short)far_epc_insn;
  285                 } else {
  286                         child->thread.insn2_type = 1;
  287                         child->thread.addr2 = far_epc;
  288                         child->thread.insn2 = far_epc_insn;
  289                 }
  290         }
  291 }
  292 
  293 void user_disable_single_step(struct task_struct *child)
  294 {
  295         if (child->thread.insn1_type == 0)
  296                 write_tsk_short(child, child->thread.addr1,
  297                                 child->thread.insn1);
  298 
  299         if (child->thread.insn1_type == 1)
  300                 write_tsk_long(child, child->thread.addr1,
  301                                 child->thread.insn1);
  302 
  303         if (child->thread.ss_nextcnt == 2) {    /* branch */
  304                 if (child->thread.insn1_type == 0)
  305                         write_tsk_short(child, child->thread.addr1,
  306                                         child->thread.insn1);
  307                 if (child->thread.insn1_type == 1)
  308                         write_tsk_long(child, child->thread.addr1,
  309                                         child->thread.insn1);
  310                 if (child->thread.insn2_type == 0)
  311                         write_tsk_short(child, child->thread.addr2,
  312                                         child->thread.insn2);
  313                 if (child->thread.insn2_type == 1)
  314                         write_tsk_long(child, child->thread.addr2,
  315                                         child->thread.insn2);
  316         }
  317 
  318         child->thread.single_step = 0;
  319         child->thread.ss_nextcnt = 0;
  320 }
  321 
  322 void ptrace_disable(struct task_struct *child)
  323 {
  324         user_disable_single_step(child);
  325 }
  326 
  327 long
  328 arch_ptrace(struct task_struct *child, long request,
  329             unsigned long addr, unsigned long data)
  330 {
  331         int ret;
  332         unsigned long __user *datap = (void __user *)data;
  333 
  334         switch (request) {
  335         case PTRACE_GETREGS:
  336                 ret = copy_regset_to_user(child, &user_score_native_view,
  337                                                 REGSET_GENERAL,
  338                                                 0, sizeof(struct pt_regs),
  339                                                 datap);
  340                 break;
  341 
  342         case PTRACE_SETREGS:
  343                 ret = copy_regset_from_user(child, &user_score_native_view,
  344                                                 REGSET_GENERAL,
  345                                                 0, sizeof(struct pt_regs),
  346                                                 datap);
  347                 break;
  348 
  349         default:
  350                 ret = ptrace_request(child, request, addr, data);
  351                 break;
  352         }
  353 
  354         return ret;
  355 }
  356 
  357 /*
  358  * Notification of system call entry/exit
  359  * - triggered by current->work.syscall_trace
  360  */
  361 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
  362 {
  363         if (!(current->ptrace & PT_PTRACED))
  364                 return;
  365 
  366         if (!test_thread_flag(TIF_SYSCALL_TRACE))
  367                 return;
  368 
  369         /* The 0x80 provides a way for the tracing parent to distinguish
  370            between a syscall stop and SIGTRAP delivery. */
  371         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
  372                         0x80 : 0));
  373 
  374         /*
  375          * this isn't the same as continuing with a signal, but it will do
  376          * for normal use.  strace only continues with a signal if the
  377          * stopping signal is not SIGTRAP.  -brl
  378          */
  379         if (current->exit_code) {
  380                 send_sig(current->exit_code, current, 1);
  381                 current->exit_code = 0;
  382         }
  383 }
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FreeBSD/Linux Kernel Cross Reference sys/arch/score/kernel/ptrace.c

FreeBSD/Linux Kernel Cross Reference
sys/arch/score/kernel/ptrace.c
