mirror of https://gitlab.com/qemu-project/qemu
s390x/tcg: MVZ: Fault-safe handling
We can process a maximum of 256 bytes, crossing two pages. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: David Hildenbrand <david@redhat.com>
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@ -553,13 +553,22 @@ void HELPER(mvo)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src)
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/* move zones */
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/* move zones */
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void HELPER(mvz)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src)
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void HELPER(mvz)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src)
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{
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{
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const int mmu_idx = cpu_mmu_index(env, false);
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S390Access srca1, srca2, desta;
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uintptr_t ra = GETPC();
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uintptr_t ra = GETPC();
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int i;
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int i;
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for (i = 0; i <= l; i++) {
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/* MVZ always copies one more byte than specified - maximum is 256 */
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uint8_t b = cpu_ldub_data_ra(env, dest + i, ra) & 0x0f;
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l++;
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b |= cpu_ldub_data_ra(env, src + i, ra) & 0xf0;
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cpu_stb_data_ra(env, dest + i, b, ra);
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srca1 = access_prepare(env, src, l, MMU_DATA_LOAD, mmu_idx, ra);
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srca2 = access_prepare(env, dest, l, MMU_DATA_LOAD, mmu_idx, ra);
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desta = access_prepare(env, dest, l, MMU_DATA_STORE, mmu_idx, ra);
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for (i = 0; i < l; i++) {
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const uint8_t x = (access_get_byte(env, &srca1, i, ra) & 0xf0) |
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(access_get_byte(env, &srca2, i, ra) & 0x0f);
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access_set_byte(env, &desta, i, x, ra);
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}
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}
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}
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}
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