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/*
* QEMU monitor for RISC-V
*
* Copyright (c) 2019 Bin Meng <bmeng.cn@gmail.com>
*
* RISC-V specific monitor commands implementation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "cpu_bits.h"
#include "monitor/monitor.h"
#include "monitor/hmp-target.h"
#ifdef TARGET_RISCV64
#define PTE_HEADER_FIELDS "vaddr paddr "\
"size attr\n"
#define PTE_HEADER_DELIMITER "---------------- ---------------- "\
"---------------- -------\n"
#else
#define PTE_HEADER_FIELDS "vaddr paddr size attr\n"
#define PTE_HEADER_DELIMITER "-------- ---------------- -------- -------\n"
#endif
/* Perform linear address sign extension */
static target_ulong addr_canonical(int va_bits, target_ulong addr)
{
#ifdef TARGET_RISCV64
if (addr & (1UL << (va_bits - 1))) {
addr |= (hwaddr)-(1L << va_bits);
}
#endif
return addr;
}
static void print_pte_header(Monitor *mon)
{
monitor_printf(mon, PTE_HEADER_FIELDS);
monitor_printf(mon, PTE_HEADER_DELIMITER);
}
static void print_pte(Monitor *mon, int va_bits, target_ulong vaddr,
hwaddr paddr, target_ulong size, int attr)
{
/* santity check on vaddr */
if (vaddr >= (1UL << va_bits)) {
return;
}
if (!size) {
return;
}
monitor_printf(mon, TARGET_FMT_lx " " TARGET_FMT_plx " " TARGET_FMT_lx
" %c%c%c%c%c%c%c\n",
addr_canonical(va_bits, vaddr),
paddr, size,
attr & PTE_R ? 'r' : '-',
attr & PTE_W ? 'w' : '-',
attr & PTE_X ? 'x' : '-',
attr & PTE_U ? 'u' : '-',
attr & PTE_G ? 'g' : '-',
attr & PTE_A ? 'a' : '-',
attr & PTE_D ? 'd' : '-');
}
static void walk_pte(Monitor *mon, hwaddr base, target_ulong start,
int level, int ptidxbits, int ptesize, int va_bits,
target_ulong *vbase, hwaddr *pbase, hwaddr *last_paddr,
target_ulong *last_size, int *last_attr)
{
hwaddr pte_addr;
hwaddr paddr;
target_ulong pgsize;
target_ulong pte;
int ptshift;
int attr;
int idx;
if (level < 0) {
return;
}
ptshift = level * ptidxbits;
pgsize = 1UL << (PGSHIFT + ptshift);
for (idx = 0; idx < (1UL << ptidxbits); idx++) {
pte_addr = base + idx * ptesize;
cpu_physical_memory_read(pte_addr, &pte, ptesize);
paddr = (hwaddr)(pte >> PTE_PPN_SHIFT) << PGSHIFT;
attr = pte & 0xff;
/* PTE has to be valid */
if (attr & PTE_V) {
if (attr & (PTE_R | PTE_W | PTE_X)) {
/*
* A leaf PTE has been found
*
* If current PTE's permission bits differ from the last one,
* or current PTE's ppn does not make a contiguous physical
* address block together with the last one, print out the last
* contiguous mapped block details.
*/
if ((*last_attr != attr) ||
(*last_paddr + *last_size != paddr)) {
print_pte(mon, va_bits, *vbase, *pbase,
*last_paddr + *last_size - *pbase, *last_attr);
*vbase = start;
*pbase = paddr;
*last_attr = attr;
}
*last_paddr = paddr;
*last_size = pgsize;
} else {
/* pointer to the next level of the page table */
walk_pte(mon, paddr, start, level - 1, ptidxbits, ptesize,
va_bits, vbase, pbase, last_paddr,
last_size, last_attr);
}
}
start += pgsize;
}
}
static void mem_info_svxx(Monitor *mon, CPUArchState *env)
{
int levels, ptidxbits, ptesize, vm, va_bits;
hwaddr base;
target_ulong vbase;
hwaddr pbase;
hwaddr last_paddr;
target_ulong last_size;
int last_attr;
base = (hwaddr)get_field(env->satp, SATP_PPN) << PGSHIFT;
vm = get_field(env->satp, SATP_MODE);
switch (vm) {
case VM_1_10_SV32:
levels = 2;
ptidxbits = 10;
ptesize = 4;
break;
case VM_1_10_SV39:
levels = 3;
ptidxbits = 9;
ptesize = 8;
break;
case VM_1_10_SV48:
levels = 4;
ptidxbits = 9;
ptesize = 8;
break;
case VM_1_10_SV57:
levels = 5;
ptidxbits = 9;
ptesize = 8;
break;
default:
g_assert_not_reached();
break;
}
/* calculate virtual address bits */
va_bits = PGSHIFT + levels * ptidxbits;
/* print header */
print_pte_header(mon);
vbase = -1;
pbase = -1;
last_paddr = -1;
last_size = 0;
last_attr = 0;
/* walk page tables, starting from address 0 */
walk_pte(mon, base, 0, levels - 1, ptidxbits, ptesize, va_bits,
&vbase, &pbase, &last_paddr, &last_size, &last_attr);
/* don't forget the last one */
print_pte(mon, va_bits, vbase, pbase,
last_paddr + last_size - pbase, last_attr);
}
void hmp_info_mem(Monitor *mon, const QDict *qdict)
{
CPUArchState *env;
env = mon_get_cpu_env();
if (!env) {
monitor_printf(mon, "No CPU available\n");
return;
}
if (!riscv_feature(env, RISCV_FEATURE_MMU)) {
monitor_printf(mon, "S-mode MMU unavailable\n");
return;
}
if (env->priv_ver < PRIV_VERSION_1_10_0) {
monitor_printf(mon, "Privileged mode < 1.10 unsupported\n");
return;
}
if (!(env->satp & SATP_MODE)) {
monitor_printf(mon, "No translation or protection\n");
return;
}
mem_info_svxx(mon, env);
}
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