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[for-6.2,40/43] linux-user/alpha: Remove TARGET_ALIGNED_ONLY

Message ID 20210729004647.282017-41-richard.henderson@linaro.org
State New
Headers show
Series Unaligned accesses for user-only | expand

Commit Message

Richard Henderson July 29, 2021, 12:46 a.m. UTC 
By default, the Linux kernel fixes up unaligned accesses.
Therefore, as the kernel surrogate, qemu should as well.
No fixups are done for load-locked/store-conditional, so
mark those as MO_ALIGN.

There is a syscall to disable this, and (among other things)
deliver SIGBUS, but it is essentially unused.  A survey of
open source code shows no uses of SSI_NVPAIRS except trivial
examples that show how to disable unaligned fixups.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 configs/targets/alpha-linux-user.mak | 1 -
 target/alpha/translate.c             | 8 ++++----
 2 files changed, 4 insertions(+), 5 deletions(-)

-- 
2.25.1
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Patch

diff --git a/configs/targets/alpha-linux-user.mak b/configs/targets/alpha-linux-user.mak
index 7e62fd796a..f7d3fb4afa 100644
--- a/configs/targets/alpha-linux-user.mak
+++ b/configs/targets/alpha-linux-user.mak
@@ -1,4 +1,3 @@ 
 TARGET_ARCH=alpha
 TARGET_SYSTBL_ABI=common
 TARGET_SYSTBL=syscall.tbl
-TARGET_ALIGNED_ONLY=y
diff --git a/target/alpha/translate.c b/target/alpha/translate.c
index de6c0a8439..8c60e90114 100644
--- a/target/alpha/translate.c
+++ b/target/alpha/translate.c
@@ -293,14 +293,14 @@  static inline void gen_qemu_lds(TCGv t0, TCGv t1, int flags)
 
 static inline void gen_qemu_ldl_l(TCGv t0, TCGv t1, int flags)
 {
-    tcg_gen_qemu_ld_i64(t0, t1, flags, MO_LESL);
+    tcg_gen_qemu_ld_i64(t0, t1, flags, MO_LESL | MO_ALIGN);
     tcg_gen_mov_i64(cpu_lock_addr, t1);
     tcg_gen_mov_i64(cpu_lock_value, t0);
 }
 
 static inline void gen_qemu_ldq_l(TCGv t0, TCGv t1, int flags)
 {
-    tcg_gen_qemu_ld_i64(t0, t1, flags, MO_LEQ);
+    tcg_gen_qemu_ld_i64(t0, t1, flags, MO_LEQ | MO_ALIGN);
     tcg_gen_mov_i64(cpu_lock_addr, t1);
     tcg_gen_mov_i64(cpu_lock_value, t0);
 }
@@ -2840,12 +2840,12 @@  static DisasJumpType translate_one(DisasContext *ctx, uint32_t insn)
     case 0x2E:
         /* STL_C */
         ret = gen_store_conditional(ctx, ra, rb, disp16,
-                                    ctx->mem_idx, MO_LESL);
+                                    ctx->mem_idx, MO_LESL | MO_ALIGN);
         break;
     case 0x2F:
         /* STQ_C */
         ret = gen_store_conditional(ctx, ra, rb, disp16,
-                                    ctx->mem_idx, MO_LEQ);
+                                    ctx->mem_idx, MO_LEQ | MO_ALIGN);
         break;
     case 0x30:
         /* BR */