target/riscv/pmp.c: Fix pmp_decode_napot()
Currently, start and end address of a PMP region are not decoded correctly by pmp_decode_napot(). Let's say we have a 128KB PMP region with base address as 0x80000000. Now, the PMPADDRx CSR value for this region will be 0x20003fff. The current pmp_decode_napot() implementation will decode PMPADDRx CSR as t1=14, base=0x100000000, and range=0x1ffff whereas it should have decoded PMPADDRx CSR as t1=14, base=0x80000000, and range=0x1fff. This patch fixes the base value decoding in pmp_decode_napot() when PMPADDRx CSR is not -1 (i.e. 0xffffffffffffffff). Signed-off-by: Anup Patel <anup@brainfault.org> Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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@ -138,7 +138,7 @@ static void pmp_decode_napot(target_ulong a, target_ulong *sa, target_ulong *ea)
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return;
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} else {
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target_ulong t1 = ctz64(~a);
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target_ulong base = (a & ~(((target_ulong)1 << t1) - 1)) << 3;
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target_ulong base = (a & ~(((target_ulong)1 << t1) - 1)) << 2;
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target_ulong range = ((target_ulong)1 << (t1 + 3)) - 1;
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*sa = base;
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*ea = base + range;
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