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examine the PDE in addition to the PTE when checking for valid mappings.

This commit is contained in:
chs 2000-11-23 21:44:52 +00:00
parent c13641ea40
commit c01c2504a2
1 changed files with 4 additions and 3 deletions
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7
sys/arch/i386/i386/db_disasm.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_disasm.c,v 1.21 2000/09/06 22:22:27 thorpej Exp $ */
/* $NetBSD: db_disasm.c,v 1.22 2000/11/23 21:44:52 chs Exp $ */
/*
* Mach Operating System
@ -1091,7 +1091,7 @@ db_disasm(loc, altfmt)
int imm2;
int len;
struct i_addr address;
pt_entry_t *pte;
pt_entry_t *pte, *pde;
/*
* Don't try to disassemble the location if the mapping is invalid.
@ -1101,7 +1101,8 @@ db_disasm(loc, altfmt)
pte = kvtopte((vaddr_t)loc);
else
pte = vtopte((vaddr_t)loc);
if ((*pte & PG_V) == 0) {
pde = vtopte((vaddr_t)pte);
if ((*pde & PG_V) == 0 || (*pte & PG_V) == 0) {
db_printf("invalid address\n");
return (loc);
}