target/riscv/monitor.c

   1 /*
   2  * QEMU monitor for RISC-V
   3  *
   4  * Copyright (c) 2019 Bin Meng <bmeng.cn@gmail.com>
   5  *
   6  * RISC-V specific monitor commands implementation
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2 or later, as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "cpu_bits.h"
  24 #include "monitor/monitor.h"
  25 #include "monitor/hmp-target.h"
  26
  27 #ifdef TARGET_RISCV64
  28 #define PTE_HEADER_FIELDS       "vaddr            paddr            "\
  29                                 "size             attr\n"
  30 #define PTE_HEADER_DELIMITER    "---------------- ---------------- "\
  31                                 "---------------- -------\n"
  32 #else
  33 #define PTE_HEADER_FIELDS       "vaddr    paddr            size     attr\n"
  34 #define PTE_HEADER_DELIMITER    "-------- ---------------- -------- -------\n"
  35 #endif
  36
  37 /* Perform linear address sign extension */
  38 static target_ulong addr_canonical(int va_bits, target_ulong addr)
  39 {
  40 #ifdef TARGET_RISCV64
  41     if (addr & (1UL << (va_bits - 1))) {
  42         addr |= (hwaddr)-(1L << va_bits);
  43     }
  44 #endif
  45
  46     return addr;
  47 }
  48
  49 static void print_pte_header(Monitor *mon)
  50 {
  51     monitor_printf(mon, PTE_HEADER_FIELDS);
  52     monitor_printf(mon, PTE_HEADER_DELIMITER);
  53 }
  54
  55 static void print_pte(Monitor *mon, int va_bits, target_ulong vaddr,
  56                       hwaddr paddr, target_ulong size, int attr)
  57 {
  58     /* santity check on vaddr */
  59     if (vaddr >= (1UL << va_bits)) {
  60         return;
  61     }
  62
  63     if (!size) {
  64         return;
  65     }
  66
  67     monitor_printf(mon, TARGET_FMT_lx " " TARGET_FMT_plx " " TARGET_FMT_lx
  68                    " %c%c%c%c%c%c%c\n",
  69                    addr_canonical(va_bits, vaddr),
  70                    paddr, size,
  71                    attr & PTE_R ? 'r' : '-',
  72                    attr & PTE_W ? 'w' : '-',
  73                    attr & PTE_X ? 'x' : '-',
  74                    attr & PTE_U ? 'u' : '-',
  75                    attr & PTE_G ? 'g' : '-',
  76                    attr & PTE_A ? 'a' : '-',
  77                    attr & PTE_D ? 'd' : '-');
  78 }
  79
  80 static void walk_pte(Monitor *mon, hwaddr base, target_ulong start,
  81                      int level, int ptidxbits, int ptesize, int va_bits,
  82                      target_ulong *vbase, hwaddr *pbase, hwaddr *last_paddr,
  83                      target_ulong *last_size, int *last_attr)
  84 {
  85     hwaddr pte_addr;
  86     hwaddr paddr;
  87     target_ulong pgsize;
  88     target_ulong pte;
  89     int ptshift;
  90     int attr;
  91     int idx;
  92
  93     if (level < 0) {
  94         return;
  95     }
  96
  97     ptshift = level * ptidxbits;
  98     pgsize = 1UL << (PGSHIFT + ptshift);
  99
 100     for (idx = 0; idx < (1UL << ptidxbits); idx++) {
 101         pte_addr = base + idx * ptesize;
 102         cpu_physical_memory_read(pte_addr, &pte, ptesize);
 103
 104         paddr = (hwaddr)(pte >> PTE_PPN_SHIFT) << PGSHIFT;
 105         attr = pte & 0xff;
 106
 107         /* PTE has to be valid */
 108         if (attr & PTE_V) {
 109             if (attr & (PTE_R | PTE_W | PTE_X)) {
 110                 /*
 111                  * A leaf PTE has been found
 112                  *
 113                  * If current PTE's permission bits differ from the last one,
 114                  * or current PTE's ppn does not make a contiguous physical
 115                  * address block together with the last one, print out the last
 116                  * contiguous mapped block details.
 117                  */
 118                 if ((*last_attr != attr) ||
 119                     (*last_paddr + *last_size != paddr)) {
 120                     print_pte(mon, va_bits, *vbase, *pbase,
 121                               *last_paddr + *last_size - *pbase, *last_attr);
 122
 123                     *vbase = start;
 124                     *pbase = paddr;
 125                     *last_attr = attr;
 126                 }
 127
 128                 *last_paddr = paddr;
 129                 *last_size = pgsize;
 130             } else {
 131                 /* pointer to the next level of the page table */
 132                 walk_pte(mon, paddr, start, level - 1, ptidxbits, ptesize,
 133                          va_bits, vbase, pbase, last_paddr,
 134                          last_size, last_attr);
 135             }
 136         }
 137
 138         start += pgsize;
 139     }
 140
 141 }
 142
 143 static void mem_info_svxx(Monitor *mon, CPUArchState *env)
 144 {
 145     int levels, ptidxbits, ptesize, vm, va_bits;
 146     hwaddr base;
 147     target_ulong vbase;
 148     hwaddr pbase;
 149     hwaddr last_paddr;
 150     target_ulong last_size;
 151     int last_attr;
 152
 153     base = (hwaddr)get_field(env->satp, SATP_PPN) << PGSHIFT;
 154
 155     vm = get_field(env->satp, SATP_MODE);
 156     switch (vm) {
 157     case VM_1_10_SV32:
 158         levels = 2;
 159         ptidxbits = 10;
 160         ptesize = 4;
 161         break;
 162     case VM_1_10_SV39:
 163         levels = 3;
 164         ptidxbits = 9;
 165         ptesize = 8;
 166         break;
 167     case VM_1_10_SV48:
 168         levels = 4;
 169         ptidxbits = 9;
 170         ptesize = 8;
 171         break;
 172     case VM_1_10_SV57:
 173         levels = 5;
 174         ptidxbits = 9;
 175         ptesize = 8;
 176         break;
 177     default:
 178         g_assert_not_reached();
 179         break;
 180     }
 181
 182     /* calculate virtual address bits */
 183     va_bits = PGSHIFT + levels * ptidxbits;
 184
 185     /* print header */
 186     print_pte_header(mon);
 187
 188     vbase = -1;
 189     pbase = -1;
 190     last_paddr = -1;
 191     last_size = 0;
 192     last_attr = 0;
 193
 194     /* walk page tables, starting from address 0 */
 195     walk_pte(mon, base, 0, levels - 1, ptidxbits, ptesize, va_bits,
 196              &vbase, &pbase, &last_paddr, &last_size, &last_attr);
 197
 198     /* don't forget the last one */
 199     print_pte(mon, va_bits, vbase, pbase,
 200               last_paddr + last_size - pbase, last_attr);
 201 }
 202
 203 void hmp_info_mem(Monitor *mon, const QDict *qdict)
 204 {
 205     CPUArchState *env;
 206
 207     env = mon_get_cpu_env(mon);
 208     if (!env) {
 209         monitor_printf(mon, "No CPU available\n");
 210         return;
 211     }
 212
 213     if (!riscv_feature(env, RISCV_FEATURE_MMU)) {
 214         monitor_printf(mon, "S-mode MMU unavailable\n");
 215         return;
 216     }
 217
 218     if (!(env->satp & SATP_MODE)) {
 219         monitor_printf(mon, "No translation or protection\n");
 220         return;
 221     }
 222
 223     mem_info_svxx(mon, env);
 224 }