qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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dbg_helper.c (4868B)

      1 /*
      2  * Copyright (c) 2011 - 2019, Max Filippov, Open Source and Linux Lab.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *     * Redistributions of source code must retain the above copyright
      8  *       notice, this list of conditions and the following disclaimer.
      9  *     * Redistributions in binary form must reproduce the above copyright
     10  *       notice, this list of conditions and the following disclaimer in the
     11  *       documentation and/or other materials provided with the distribution.
     12  *     * Neither the name of the Open Source and Linux Lab nor the
     13  *       names of its contributors may be used to endorse or promote products
     14  *       derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "qemu/osdep.h"
     29 #include "qemu/log.h"
     30 #include "qemu/main-loop.h"
     31 #include "cpu.h"
     32 #include "exec/helper-proto.h"
     33 #include "qemu/host-utils.h"
     34 #include "exec/exec-all.h"
     35 #include "exec/address-spaces.h"
     36 
     37 static void tb_invalidate_virtual_addr(CPUXtensaState *env, uint32_t vaddr)
     38 {
     39     uint32_t paddr;
     40     uint32_t page_size;
     41     unsigned access;
     42     int ret = xtensa_get_physical_addr(env, false, vaddr, 2, 0,
     43                                        &paddr, &page_size, &access);
     44     if (ret == 0) {
     45         tb_invalidate_phys_addr(&address_space_memory, paddr,
     46                                 MEMTXATTRS_UNSPECIFIED);
     47     }
     48 }
     49 
     50 void HELPER(wsr_ibreakenable)(CPUXtensaState *env, uint32_t v)
     51 {
     52     uint32_t change = v ^ env->sregs[IBREAKENABLE];
     53     unsigned i;
     54 
     55     for (i = 0; i < env->config->nibreak; ++i) {
     56         if (change & (1 << i)) {
     57             tb_invalidate_virtual_addr(env, env->sregs[IBREAKA + i]);
     58         }
     59     }
     60     env->sregs[IBREAKENABLE] = v & ((1 << env->config->nibreak) - 1);
     61 }
     62 
     63 void HELPER(wsr_ibreaka)(CPUXtensaState *env, uint32_t i, uint32_t v)
     64 {
     65     if (env->sregs[IBREAKENABLE] & (1 << i) && env->sregs[IBREAKA + i] != v) {
     66         tb_invalidate_virtual_addr(env, env->sregs[IBREAKA + i]);
     67         tb_invalidate_virtual_addr(env, v);
     68     }
     69     env->sregs[IBREAKA + i] = v;
     70 }
     71 
     72 static void set_dbreak(CPUXtensaState *env, unsigned i, uint32_t dbreaka,
     73         uint32_t dbreakc)
     74 {
     75     CPUState *cs = env_cpu(env);
     76     int flags = BP_CPU | BP_STOP_BEFORE_ACCESS;
     77     uint32_t mask = dbreakc | ~DBREAKC_MASK;
     78 
     79     if (env->cpu_watchpoint[i]) {
     80         cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[i]);
     81     }
     82     if (dbreakc & DBREAKC_SB) {
     83         flags |= BP_MEM_WRITE;
     84     }
     85     if (dbreakc & DBREAKC_LB) {
     86         flags |= BP_MEM_READ;
     87     }
     88     /* contiguous mask after inversion is one less than some power of 2 */
     89     if ((~mask + 1) & ~mask) {
     90         qemu_log_mask(LOG_GUEST_ERROR,
     91                       "DBREAKC mask is not contiguous: 0x%08x\n", dbreakc);
     92         /* cut mask after the first zero bit */
     93         mask = 0xffffffff << (32 - clo32(mask));
     94     }
     95     if (cpu_watchpoint_insert(cs, dbreaka & mask, ~mask + 1,
     96                               flags, &env->cpu_watchpoint[i])) {
     97         env->cpu_watchpoint[i] = NULL;
     98         qemu_log_mask(LOG_GUEST_ERROR,
     99                       "Failed to set data breakpoint at 0x%08x/%d\n",
    100                       dbreaka & mask, ~mask + 1);
    101     }
    102 }
    103 
    104 void HELPER(wsr_dbreaka)(CPUXtensaState *env, uint32_t i, uint32_t v)
    105 {
    106     uint32_t dbreakc = env->sregs[DBREAKC + i];
    107 
    108     if ((dbreakc & DBREAKC_SB_LB) &&
    109         env->sregs[DBREAKA + i] != v) {
    110         set_dbreak(env, i, v, dbreakc);
    111     }
    112     env->sregs[DBREAKA + i] = v;
    113 }
    114 
    115 void HELPER(wsr_dbreakc)(CPUXtensaState *env, uint32_t i, uint32_t v)
    116 {
    117     if ((env->sregs[DBREAKC + i] ^ v) & (DBREAKC_SB_LB | DBREAKC_MASK)) {
    118         if (v & DBREAKC_SB_LB) {
    119             set_dbreak(env, i, env->sregs[DBREAKA + i], v);
    120         } else {
    121             if (env->cpu_watchpoint[i]) {
    122                 CPUState *cs = env_cpu(env);
    123 
    124                 cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[i]);
    125                 env->cpu_watchpoint[i] = NULL;
    126             }
    127         }
    128     }
    129     env->sregs[DBREAKC + i] = v;
    130 }