8:46 p.m.
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 fffb8bf772
VIRTUAL PHYSICAL
fffb8bf772 40000001231bf772
SEGMENT: xuvrange
PAGE DIRECTORY: 9000000096d10000
PGD: 9000000096d10078 => 900000009665c000
PMD: 000000009665ffe8 => 9000000098894000
PTE: 0000000098897178 => 40000001231bc39f
PAGE: 40000001231bc000
PTE PHYSICAL FLAGS
40000001231bc39f 40000001231bc000 (VALID|DIRTY|PLV|PRESENT|WRITE|PROTNONE|NO_EXEC)
VMA START END FLAGS FILE
90000000a4927660 fffb89c000 fffb8c0000 100173
Co-developed-by: Youling Tang <tangyouling(a)loongson.cn>
Signed-off-by: Youling Tang <tangyouling(a)loongson.cn>
Signed-off-by: Ming Wang <wangming01(a)loongson.cn>
---
loongarch64.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 122 insertions(+)
diff --git a/loongarch64.c b/loongarch64.c
index 7d74371..1a904bd 100644
--- a/loongarch64.c
+++ b/loongarch64.c
@@ -24,6 +24,8 @@ static int loongarch64_uvtop(struct task_context *tc, ulong vaddr,
physaddr_t *paddr, int verbose);
static int loongarch64_kvtop(struct task_context *tc, ulong kvaddr,
physaddr_t *paddr, int verbose);
+static int loongarch64_translate_pte(ulong pte, void *physaddr,
+ ulonglong pte64);
/*
* 3 Levels paging PAGE_SIZE=16KB
@@ -58,6 +60,110 @@ typedef struct { ulong pte; } pte_t;
static struct machine_specific loongarch64_machine_specific = { 0 };
+/*
+ * Check and print the flags on the page
+ */
+static void
+check_page_flags(ulong pte)
+{
+#define CHECK_PAGE_FLAG(flag) \
+ if ((_PAGE_##flag) && (pte & _PAGE_##flag)) \
+ fprintf(fp, "%s" #flag, others++ ? "|" : "")
+
+ int others = 0;
+ fprintf(fp, "(");
+
+ if (pte) {
+ CHECK_PAGE_FLAG(VALID);
+ CHECK_PAGE_FLAG(DIRTY);
+ CHECK_PAGE_FLAG(PLV);
+
+ /* Determine whether it is a huge page format */
+ if (pte & _PAGE_HGLOBAL) {
+ CHECK_PAGE_FLAG(HUGE);
+ CHECK_PAGE_FLAG(HGLOBAL);
+ } else {
+ CHECK_PAGE_FLAG(GLOBAL);
+ }
+
+ CHECK_PAGE_FLAG(PRESENT);
+ CHECK_PAGE_FLAG(WRITE);
+ CHECK_PAGE_FLAG(PROTNONE);
+ CHECK_PAGE_FLAG(SPECIAL);
+ CHECK_PAGE_FLAG(NO_READ);
+ CHECK_PAGE_FLAG(NO_EXEC);
+ CHECK_PAGE_FLAG(RPLV);
+ } else {
+ fprintf(fp, "no mapping");
+ }
+
+ fprintf(fp, ")\n");
+}
+
+/*
+ * Translate a PTE, returning TRUE if the page is present.
+ * If a physaddr pointer is passed in, don't print anything.
+ */
+static int
+loongarch64_translate_pte(ulong pte, void *physaddr, ulonglong unused)
+{
+ char ptebuf[BUFSIZE];
+ char physbuf[BUFSIZE];
+ char buf1[BUFSIZE];
+ char buf2[BUFSIZE];
+ char buf3[BUFSIZE];
+ char *arglist[MAXARGS];
+ int page_present;
+ int c, len1, len2, len3;
+ 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(buf1, len1, CENTER | LJUST, "PTE"));
+
+ if (!page_present) {
+ swap_location(pte, buf1);
+ if ((c = parse_line(buf1, arglist)) != 3)
+ error(FATAL, "cannot determine swap location\n");
+
+ len2 = MAX(strlen(arglist[0]), strlen("SWAP"));
+ len3 = MAX(strlen(arglist[2]), strlen("OFFSET"));
+
+ fprintf(fp, "%s %s\n",
+ mkstring(buf2, len2, CENTER|LJUST, "SWAP"),
+ mkstring(buf3, len3, CENTER|LJUST, "OFFSET"));
+
+ strcpy(buf2, arglist[0]);
+ strcpy(buf3, arglist[2]);
+ fprintf(fp, "%s %s %s\n",
+ mkstring(ptebuf, len1, CENTER|RJUST, NULL),
+ mkstring(buf2, len2, CENTER|RJUST, NULL),
+ mkstring(buf3, len3, CENTER|RJUST, NULL));
+ return page_present;
+ }
+
+ sprintf(physbuf, "%lx", paddr);
+ len2 = MAX(strlen(physbuf), strlen("PHYSICAL"));
+ fprintf(fp, "%s ", mkstring(buf1, len2, CENTER | LJUST,
"PHYSICAL"));
+
+ fprintf(fp, "FLAGS\n");
+ fprintf(fp, "%s %s ",
+ mkstring(ptebuf, len1, CENTER | RJUST, NULL),
+ mkstring(physbuf, len2, CENTER | RJUST, NULL));
+
+ check_page_flags(pte);
+
+ return page_present;
+}
+
/*
* Identify and print the segment name to which the virtual address belongs
*/
@@ -125,6 +231,21 @@ loongarch64_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");
+ loongarch64_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));
+ loongarch64_translate_pte(pte_val, 0, 0);
+ }
+
return TRUE;
no_page:
fprintf(fp, "invalid\n");
@@ -324,6 +445,7 @@ loongarch64_init(int when)
machdep->processor_speed = loongarch64_processor_speed;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
+ machdep->translate_pte = loongarch64_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = loongarch64_is_task_addr;
machdep->get_smp_cpus = loongarch64_get_smp_cpus;
--
2.34.1