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author | Richard Henderson <richard.henderson@linaro.org> | 2024-07-09 18:40:58 -0700 |
---|---|---|
committer | Richard Henderson <richard.henderson@linaro.org> | 2024-07-23 10:57:31 +1000 |
commit | 2730df919093d014e96e68f1f982054da3f79e5b (patch) | |
tree | eeccef0e94d99d4865cf3e7eadebf7422c04fdfa /target/s390x | |
parent | 573b7783012a26ff1a88c010353ee6e85965dcdc (diff) | |
download | qemu-2730df919093d014e96e68f1f982054da3f79e5b.zip qemu-2730df919093d014e96e68f1f982054da3f79e5b.tar.gz qemu-2730df919093d014e96e68f1f982054da3f79e5b.tar.bz2 |
target/s390x: Use set/clear_helper_retaddr in mem_helper.c
Avoid a race condition with munmap in another thread.
For access_memset and access_memmove, manage the value
within the helper. For uses of access_{get,set}_byte,
manage the value across the for loops.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/s390x')
-rw-r--r-- | target/s390x/tcg/mem_helper.c | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c index 331a35b..0e12dae 100644 --- a/target/s390x/tcg/mem_helper.c +++ b/target/s390x/tcg/mem_helper.c @@ -238,14 +238,14 @@ static void do_access_memset(CPUS390XState *env, vaddr vaddr, char *haddr, static void access_memset(CPUS390XState *env, S390Access *desta, uint8_t byte, uintptr_t ra) { - + set_helper_retaddr(ra); do_access_memset(env, desta->vaddr1, desta->haddr1, byte, desta->size1, desta->mmu_idx, ra); - if (likely(!desta->size2)) { - return; + if (unlikely(desta->size2)) { + do_access_memset(env, desta->vaddr2, desta->haddr2, byte, + desta->size2, desta->mmu_idx, ra); } - do_access_memset(env, desta->vaddr2, desta->haddr2, byte, desta->size2, - desta->mmu_idx, ra); + clear_helper_retaddr(); } static uint8_t access_get_byte(CPUS390XState *env, S390Access *access, @@ -366,6 +366,8 @@ static uint32_t do_helper_nc(CPUS390XState *env, uint32_t l, uint64_t dest, access_prepare(&srca1, env, src, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&srca2, env, dest, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, dest, l, MMU_DATA_STORE, mmu_idx, ra); + set_helper_retaddr(ra); + for (i = 0; i < l; i++) { const uint8_t x = access_get_byte(env, &srca1, i, ra) & access_get_byte(env, &srca2, i, ra); @@ -373,6 +375,8 @@ static uint32_t do_helper_nc(CPUS390XState *env, uint32_t l, uint64_t dest, c |= x; access_set_byte(env, &desta, i, x, ra); } + + clear_helper_retaddr(); return c != 0; } @@ -407,6 +411,7 @@ static uint32_t do_helper_xc(CPUS390XState *env, uint32_t l, uint64_t dest, return 0; } + set_helper_retaddr(ra); for (i = 0; i < l; i++) { const uint8_t x = access_get_byte(env, &srca1, i, ra) ^ access_get_byte(env, &srca2, i, ra); @@ -414,6 +419,7 @@ static uint32_t do_helper_xc(CPUS390XState *env, uint32_t l, uint64_t dest, c |= x; access_set_byte(env, &desta, i, x, ra); } + clear_helper_retaddr(); return c != 0; } @@ -441,6 +447,8 @@ static uint32_t do_helper_oc(CPUS390XState *env, uint32_t l, uint64_t dest, access_prepare(&srca1, env, src, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&srca2, env, dest, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, dest, l, MMU_DATA_STORE, mmu_idx, ra); + set_helper_retaddr(ra); + for (i = 0; i < l; i++) { const uint8_t x = access_get_byte(env, &srca1, i, ra) | access_get_byte(env, &srca2, i, ra); @@ -448,6 +456,8 @@ static uint32_t do_helper_oc(CPUS390XState *env, uint32_t l, uint64_t dest, c |= x; access_set_byte(env, &desta, i, x, ra); } + + clear_helper_retaddr(); return c != 0; } @@ -484,11 +494,13 @@ static uint32_t do_helper_mvc(CPUS390XState *env, uint32_t l, uint64_t dest, } else if (!is_destructive_overlap(env, dest, src, l)) { access_memmove(env, &desta, &srca, ra); } else { + set_helper_retaddr(ra); for (i = 0; i < l; i++) { uint8_t byte = access_get_byte(env, &srca, i, ra); access_set_byte(env, &desta, i, byte, ra); } + clear_helper_retaddr(); } return env->cc_op; @@ -514,10 +526,12 @@ void HELPER(mvcrl)(CPUS390XState *env, uint64_t l, uint64_t dest, uint64_t src) access_prepare(&srca, env, src, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, dest, l, MMU_DATA_STORE, mmu_idx, ra); + set_helper_retaddr(ra); for (i = l - 1; i >= 0; i--) { uint8_t byte = access_get_byte(env, &srca, i, ra); access_set_byte(env, &desta, i, byte, ra); } + clear_helper_retaddr(); } /* move inverse */ @@ -534,11 +548,13 @@ void HELPER(mvcin)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) src = wrap_address(env, src - l + 1); access_prepare(&srca, env, src, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, dest, l, MMU_DATA_STORE, mmu_idx, ra); + + set_helper_retaddr(ra); for (i = 0; i < l; i++) { const uint8_t x = access_get_byte(env, &srca, l - i - 1, ra); - access_set_byte(env, &desta, i, x, ra); } + clear_helper_retaddr(); } /* move numerics */ @@ -555,12 +571,15 @@ void HELPER(mvn)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) access_prepare(&srca1, env, src, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&srca2, env, dest, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, dest, l, MMU_DATA_STORE, mmu_idx, ra); + + set_helper_retaddr(ra); for (i = 0; i < l; i++) { const uint8_t x = (access_get_byte(env, &srca1, i, ra) & 0x0f) | (access_get_byte(env, &srca2, i, ra) & 0xf0); access_set_byte(env, &desta, i, x, ra); } + clear_helper_retaddr(); } /* move with offset */ @@ -580,6 +599,8 @@ void HELPER(mvo)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) /* Handle rightmost byte */ byte_dest = cpu_ldub_data_ra(env, dest + len_dest - 1, ra); + + set_helper_retaddr(ra); byte_src = access_get_byte(env, &srca, len_src - 1, ra); byte_dest = (byte_dest & 0x0f) | (byte_src << 4); access_set_byte(env, &desta, len_dest - 1, byte_dest, ra); @@ -595,6 +616,7 @@ void HELPER(mvo)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) byte_dest |= byte_src << 4; access_set_byte(env, &desta, i, byte_dest, ra); } + clear_helper_retaddr(); } /* move zones */ @@ -611,12 +633,15 @@ void HELPER(mvz)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) access_prepare(&srca1, env, src, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&srca2, env, dest, l, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, dest, l, MMU_DATA_STORE, mmu_idx, ra); + + set_helper_retaddr(ra); for (i = 0; i < l; i++) { const uint8_t x = (access_get_byte(env, &srca1, i, ra) & 0xf0) | (access_get_byte(env, &srca2, i, ra) & 0x0f); access_set_byte(env, &desta, i, x, ra); } + clear_helper_retaddr(); } /* compare unsigned byte arrays */ @@ -961,15 +986,19 @@ uint32_t HELPER(mvst)(CPUS390XState *env, uint32_t r1, uint32_t r2) */ access_prepare(&srca, env, s, len, MMU_DATA_LOAD, mmu_idx, ra); access_prepare(&desta, env, d, len, MMU_DATA_STORE, mmu_idx, ra); + + set_helper_retaddr(ra); for (i = 0; i < len; i++) { const uint8_t v = access_get_byte(env, &srca, i, ra); access_set_byte(env, &desta, i, v, ra); if (v == c) { + clear_helper_retaddr(); set_address_zero(env, r1, d + i); return 1; } } + clear_helper_retaddr(); set_address_zero(env, r1, d + len); set_address_zero(env, r2, s + len); return 3; @@ -1060,6 +1089,7 @@ static inline uint32_t do_mvcl(CPUS390XState *env, *dest = wrap_address(env, *dest + len); } else { access_prepare(&desta, env, *dest, len, MMU_DATA_STORE, mmu_idx, ra); + set_helper_retaddr(ra); /* The remaining length selects the padding byte. */ for (i = 0; i < len; (*destlen)--, i++) { @@ -1069,6 +1099,7 @@ static inline uint32_t do_mvcl(CPUS390XState *env, access_set_byte(env, &desta, i, pad >> 8, ra); } } + clear_helper_retaddr(); *dest = wrap_address(env, *dest + len); } |