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| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-08-30 11:58:45 +0200 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2013-09-12 11:20:42 -0700 |
| commit | f2f8560c7a5303065a2a3207ec475dfb3a622a0e (patch) | |
| tree | 6270568fe70db2f5b9ec9b5b1d52f13d44f3b1c3 /target-i386 | |
| parent | 2d1fe1873a984d1c2c89ffa3d12949cafc718551 (diff) | |
| download | qemu-f2f8560c7a5303065a2a3207ec475dfb3a622a0e.zip qemu-f2f8560c7a5303065a2a3207ec475dfb3a622a0e.tar.gz qemu-f2f8560c7a5303065a2a3207ec475dfb3a622a0e.tar.bz2 | |
target-i386: fix disassembly with PAE=1, PG=0
CR4.PAE=1 will not enable paging if CR0.PG=0, but the "if" chain
in x86_cpu_get_phys_page_debug says otherwise. Check CR0.PG
before everything else.
Fixes "-d in_asm" for a code section at the beginning of OVMF.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/helper.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/target-i386/helper.c b/target-i386/helper.c index 7c58e27..8bf85ec 100644 --- a/target-i386/helper.c +++ b/target-i386/helper.c @@ -894,7 +894,10 @@ hwaddr x86_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) uint32_t page_offset; int page_size; - if (env->cr[4] & CR4_PAE_MASK) { + if (!(env->cr[0] & CR0_PG_MASK)) { + pte = addr & env->a20_mask; + page_size = 4096; + } else if (env->cr[4] & CR4_PAE_MASK) { target_ulong pdpe_addr; uint64_t pde, pdpe; @@ -952,26 +955,21 @@ hwaddr x86_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) } else { uint32_t pde; - if (!(env->cr[0] & CR0_PG_MASK)) { - pte = addr; - page_size = 4096; + /* page directory entry */ + pde_addr = ((env->cr[3] & ~0xfff) + ((addr >> 20) & 0xffc)) & env->a20_mask; + pde = ldl_phys(pde_addr); + if (!(pde & PG_PRESENT_MASK)) + return -1; + if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { + pte = pde & ~0x003ff000; /* align to 4MB */ + page_size = 4096 * 1024; } else { /* page directory entry */ - pde_addr = ((env->cr[3] & ~0xfff) + ((addr >> 20) & 0xffc)) & env->a20_mask; - pde = ldl_phys(pde_addr); - if (!(pde & PG_PRESENT_MASK)) + pte_addr = ((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask; + pte = ldl_phys(pte_addr); + if (!(pte & PG_PRESENT_MASK)) return -1; - if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { - pte = pde & ~0x003ff000; /* align to 4MB */ - page_size = 4096 * 1024; - } else { - /* page directory entry */ - pte_addr = ((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask; - pte = ldl_phys(pte_addr); - if (!(pte & PG_PRESENT_MASK)) - return -1; - page_size = 4096; - } + page_size = 4096; } pte = pte & env->a20_mask; } |