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[PATCH v2 12/13] target/s390x: Use set/clear_helper_retaddr in mem_helpe
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From: |
Richard Henderson |
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Subject: |
[PATCH v2 12/13] target/s390x: Use set/clear_helper_retaddr in mem_helper.c |
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Date: |
Tue, 9 Jul 2024 20:28:13 -0700 |
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.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/s390x/tcg/mem_helper.c | 43 ++++++++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 6 deletions(-)
diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c
index a76eb6182f..eb1f8880cd 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);
}
--
2.43.0
- [PATCH v2 07/13] target/ppc: Split out helper_dbczl for 970, (continued)
- [PATCH v2 07/13] target/ppc: Split out helper_dbczl for 970, Richard Henderson, 2024/07/09
- [PATCH v2 09/13] target/ppc: Improve helper_dcbz for user-only, Richard Henderson, 2024/07/09
- [PATCH v2 10/13] target/s390x: Use user_or_likely in do_access_memset, Richard Henderson, 2024/07/09
- [PATCH v2 08/13] target/ppc: Merge helper_{dcbz,dcbzep}, Richard Henderson, 2024/07/09
- [PATCH v2 12/13] target/s390x: Use set/clear_helper_retaddr in mem_helper.c,
Richard Henderson <=
- [PATCH v2 13/13] target/riscv: Simplify probing in vext_ldff, Richard Henderson, 2024/07/09
- [PATCH v2 11/13] target/s390x: Use user_or_likely in access_memmove, Richard Henderson, 2024/07/09