The pte command converts the pte table entry into a physical address and
displays the page flags. Also fixed the pte part in the vtop command.
E.g. With this patch:
crash> vtop ffffffffc0004000
VIRTUAL PHYSICAL
ffffffffc0004000 2504ac000
SEGMENT: sseg
PAGE DIRECTORY: ffffffff81330000
PGD: ffffffff81333ff8 => 9800000255828000
PMD: 000000025582bf00 => 98000002504bc000
PTE: 00000002504bc008 => 0000001282563e0f
PAGE: 00000002504ac000
PTE PHYSICAL FLAGS
1282563e0f 2504ac000 (PRESENT|WRITE|ACCESSED|MODIFIED|GLOBAL|VALID|DIRTY)
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
9800000257f04ac0 2504ac000 0 0 1 2501fff000000
crash> pte 1282563e0f
PTE PHYSICAL FLAGS
1282563e0f 2504ac000 (PRESENT|WRITE|ACCESSED|MODIFIED|GLOBAL|VALID|DIRTY)
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Youling Tang <tangyouling@xxxxxxxxxxx>
---
v1 -> v2:
- No change.
mips64.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 118 insertions(+)
diff --git a/mips64.c b/mips64.c
index 89de5c3..e4cdaf5 100644
--- a/mips64.c
+++ b/mips64.c
@@ -23,6 +23,9 @@ static int mips64_uvtop(struct task_context *tc, ulong vaddr,
physaddr_t *paddr, int verbose);
static int mips64_kvtop(struct task_context *tc, ulong kvaddr,
physaddr_t *paddr, int verbose);
+static void mips64_init_page_flags(void);
+static int mips64_translate_pte(ulong pte, void *physaddr,
+ ulonglong pte64);
/*
* 3 Levels paging PAGE_SIZE=16KB
@@ -75,6 +78,104 @@ static struct machine_specific mips64_machine_specific = { 0 };
static struct mips64_register *panic_task_regs;
/*
+ * 31 15 14 12 11 10 9 8 7 6 5 4 3 2 1 0
+ * +-------------------+--------+--+--+--+--+--+--+--+--+--+--+--+--+
+ * | VPN | C | D| V| G|RI|XI|SP|PN| H| M| A| W| P|
+ * +-------------------+--------+--+--+--+--+--+--+--+--+--+--+--+--+
+ */
+static void
+mips64_init_page_flags(void)
+{
+ ulong shift = 0;
+
+ _PAGE_PRESENT = 1UL << shift++;
+ _PAGE_WRITE = 1UL << shift++;
+ _PAGE_ACCESSED = 1UL << shift++;
+ _PAGE_MODIFIED = 1UL << shift++;
+ _PAGE_HUGE = 1UL << shift++;
+ _PAGE_PROTNONE = 1UL << shift++;
+
+ if (THIS_KERNEL_VERSION >= LINUX(4,5,0))
+ _PAGE_SPECIAL = 1UL << shift++;
+
+ _PAGE_NO_EXEC = 1UL << shift++;
+ _PAGE_NO_READ = _PAGE_READ = 1UL << shift++;
+ _PAGE_GLOBAL = 1UL << shift++;
+ _PAGE_VALID = 1UL << shift++;
+ _PAGE_DIRTY = 1UL << shift++;
+
+ _PFN_SHIFT = PAGESHIFT() - 12 + shift + 3;
+}
+
+/*
+ * Translate a PTE, returning TRUE if the page is present.
+ * If a physaddr pointer is passed in, don't print anything.
+ */
+static int
+mips64_translate_pte(ulong pte, void *physaddr, ulonglong pte64)
+{
+ char ptebuf[BUFSIZE];
+ char physbuf[BUFSIZE];
+ char buf[BUFSIZE];
+ int page_present;
+ int len1, len2, others;
+ ulong paddr;
+
+ paddr = PTOB(pte >> _PFN_SHIFT);
+ page_present = !!(pte & _PAGE_PRESENT);
+
+ if (physaddr) {
+ *(ulong *)physaddr = paddr;
+ return page_present;
+ }
+
+ sprintf(ptebuf, "%lx", pte);
+ len1 = MAX(strlen(ptebuf), strlen("PTE"));
+ fprintf(fp, "%s ", mkstring(buf, len1, CENTER | LJUST, "PTE"));
+
+ if (!page_present)
+ return page_present;
+
+ sprintf(physbuf, "%lx", paddr);
+ len2 = MAX(strlen(physbuf), strlen("PHYSICAL"));
+ fprintf(fp, "%s ", mkstring(buf, len2, CENTER | LJUST, "PHYSICAL"));
+
+ fprintf(fp, "FLAGS\n");
+ fprintf(fp, "%s %s ",
+ mkstring(ptebuf, len1, CENTER | RJUST, NULL),
+ mkstring(physbuf, len2, CENTER | RJUST, NULL));
+
+ fprintf(fp, "(");
+ others = 0;
+
+#define CHECK_PAGE_FLAG(flag) \
+ if ((_PAGE_##flag) && (pte & _PAGE_##flag)) \
+ fprintf(fp, "%s" #flag, others++ ? "|" : "")
+
+ if (pte) {
+ CHECK_PAGE_FLAG(PRESENT);
+ CHECK_PAGE_FLAG(WRITE);
+ CHECK_PAGE_FLAG(ACCESSED);
+ CHECK_PAGE_FLAG(MODIFIED);
+ CHECK_PAGE_FLAG(HUGE);
+ CHECK_PAGE_FLAG(PROTNONE);
+ CHECK_PAGE_FLAG(SPECIAL);
+ CHECK_PAGE_FLAG(NO_EXEC);
+ CHECK_PAGE_FLAG(NO_READ);
+ CHECK_PAGE_FLAG(READ);
+ CHECK_PAGE_FLAG(GLOBAL);
+ CHECK_PAGE_FLAG(VALID);
+ CHECK_PAGE_FLAG(DIRTY);
+ } else {
+ fprintf(fp, "no mapping");
+ }
+
+ fprintf(fp, ")\n");
+
+ return page_present;
+}
+
+/*
* Virtual to physical memory translation. This function will be called
* by both mips64_kvtop and mips64_uvtop.
*/
@@ -140,6 +241,21 @@ mips64_pgd_vtop(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
if (!pte_val)
goto no_page;
+ if (!(pte_val & _PAGE_PRESENT)) {
+ if (verbose) {
+ fprintf(fp, "\n");
+ mips64_translate_pte((ulong)pte_val, 0, pte_val);
+ }
+ return FALSE;
+ }
+
+ *paddr = PTOB(pte_val >> _PFN_SHIFT) + PAGEOFFSET(vaddr);
+
+ if (verbose) {
+ fprintf(fp, " PAGE: %016lx\n\n", PAGEBASE(*paddr));
+ mips64_translate_pte(pte_val, 0, 0);
+ }
+
return TRUE;
no_page:
fprintf(fp, "invalid\n");
@@ -320,6 +436,7 @@ mips64_init(int when)
machdep->processor_speed = mips64_processor_speed;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
+ machdep->translate_pte = mips64_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = mips64_is_task_addr;
machdep->get_smp_cpus = mips64_get_smp_cpus;
@@ -328,6 +445,7 @@ mips64_init(int when)
break;
case POST_GDB:
+ mips64_init_page_flags();
machdep->section_size_bits = _SECTION_SIZE_BITS;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
--
2.1.0
--
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