[PATCH v2 54/55] target/hppa: Implement prctl_unalign_sigbus

[Richard Henderson <richard.henderson@linaro.org>]

Leave TARGET_ALIGNED_ONLY set, but use the new CPUState
flag to set MO_UNALN for the instructions that the kernel
handles in the unaligned trap.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/hppa/cpu.h       |  5 ++++-
 hw/core/cpu-user.c      |  2 +-
 linux-user/syscall.c    |  2 +-
 target/hppa/translate.c | 19 +++++++++++++++----
 4 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
index 748270bfa3..332ca5de62 100644
--- a/target/hppa/cpu.h
+++ b/target/hppa/cpu.h
@@ -259,12 +259,14 @@ static inline target_ulong hppa_form_gva(CPUHPPAState *env, uint64_t spc,
     return hppa_form_gva_psw(env->psw, spc, off);
 }
 
-/* Since PSW_{I,CB} will never need to be in tb->flags, reuse them.
+/*
+ * Since PSW_{I,CB} will never need to be in tb->flags, reuse them.
  * TB_FLAG_SR_SAME indicates that SR4 through SR7 all contain the
  * same value.
  */
 #define TB_FLAG_SR_SAME     PSW_I
 #define TB_FLAG_PRIV_SHIFT  8
+#define TB_FLAG_UNALIGN     0x400
 
 static inline void cpu_get_tb_cpu_state(CPUHPPAState *env, target_ulong *pc,
                                         target_ulong *cs_base,
@@ -279,6 +281,7 @@ static inline void cpu_get_tb_cpu_state(CPUHPPAState *env, target_ulong *pc,
 #ifdef CONFIG_USER_ONLY
     *pc = env->iaoq_f & -4;
     *cs_base = env->iaoq_b & -4;
+    flags |= TB_FLAG_UNALIGN * !env_cpu(env)->prctl_unalign_sigbus;
 #else
     /* ??? E, T, H, L, B, P bits need to be here, when implemented.  */
     flags |= env->psw & (PSW_W | PSW_C | PSW_D);
diff --git a/hw/core/cpu-user.c b/hw/core/cpu-user.c
index daf8ff59b5..6a5edcfb77 100644
--- a/hw/core/cpu-user.c
+++ b/hw/core/cpu-user.c
@@ -24,7 +24,7 @@ static Property cpu_useronly_props[] = {
      * up its memory. The default if no link is set up is to use the
      * system address space.
      */
-#if defined(TARGET_ALPHA)
+#if defined(TARGET_ALPHA) || defined(TARGET_HPPA)
     DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
                      prctl_unalign_sigbus, false),
 #endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 15080d0539..836a7eaee2 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6644,7 +6644,7 @@ static abi_long do_prctl(CPUArchState *env, abi_long option, abi_long arg2,
      * We only implement PR_UNALIGN_SIGBUS, and only for those targets
      * who have had their translator updated to insert MO_ALIGN.
      */
-#if defined(TARGET_ALPHA)
+#if defined(TARGET_ALPHA) || defined(TARGET_HPPA)
     case PR_GET_UNALIGN:
         {
             CPUState *cs = env_cpu(env);
diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index b18150ef8d..1cfa801533 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -275,8 +275,18 @@ typedef struct DisasContext {
     int mmu_idx;
     int privilege;
     bool psw_n_nonzero;
+
+#ifdef CONFIG_USER_ONLY
+    MemOp unalign;
+#endif
 } DisasContext;
 
+#ifdef CONFIG_USER_ONLY
+#define UNALIGN(C)  (C)->unalign
+#else
+#define UNALIGN(C)  0
+#endif
+
 /* Note that ssm/rsm instructions number PSW_W and PSW_E differently.  */
 static int expand_sm_imm(DisasContext *ctx, int val)
 {
@@ -1480,7 +1490,7 @@ static void do_load_32(DisasContext *ctx, TCGv_i32 dest, unsigned rb,
 
     form_gva(ctx, &addr, &ofs, rb, rx, scale, disp, sp, modify,
              ctx->mmu_idx == MMU_PHYS_IDX);
-    tcg_gen_qemu_ld_reg(dest, addr, ctx->mmu_idx, mop);
+    tcg_gen_qemu_ld_reg(dest, addr, ctx->mmu_idx, mop | UNALIGN(ctx));
     if (modify) {
         save_gpr(ctx, rb, ofs);
     }
@@ -1498,7 +1508,7 @@ static void do_load_64(DisasContext *ctx, TCGv_i64 dest, unsigned rb,
 
     form_gva(ctx, &addr, &ofs, rb, rx, scale, disp, sp, modify,
              ctx->mmu_idx == MMU_PHYS_IDX);
-    tcg_gen_qemu_ld_i64(dest, addr, ctx->mmu_idx, mop);
+    tcg_gen_qemu_ld_i64(dest, addr, ctx->mmu_idx, mop | UNALIGN(ctx));
     if (modify) {
         save_gpr(ctx, rb, ofs);
     }
@@ -1516,7 +1526,7 @@ static void do_store_32(DisasContext *ctx, TCGv_i32 src, unsigned rb,
 
     form_gva(ctx, &addr, &ofs, rb, rx, scale, disp, sp, modify,
              ctx->mmu_idx == MMU_PHYS_IDX);
-    tcg_gen_qemu_st_i32(src, addr, ctx->mmu_idx, mop);
+    tcg_gen_qemu_st_i32(src, addr, ctx->mmu_idx, mop | UNALIGN(ctx));
     if (modify) {
         save_gpr(ctx, rb, ofs);
     }
@@ -1534,7 +1544,7 @@ static void do_store_64(DisasContext *ctx, TCGv_i64 src, unsigned rb,
 
     form_gva(ctx, &addr, &ofs, rb, rx, scale, disp, sp, modify,
              ctx->mmu_idx == MMU_PHYS_IDX);
-    tcg_gen_qemu_st_i64(src, addr, ctx->mmu_idx, mop);
+    tcg_gen_qemu_st_i64(src, addr, ctx->mmu_idx, mop | UNALIGN(ctx));
     if (modify) {
         save_gpr(ctx, rb, ofs);
     }
@@ -4113,6 +4123,7 @@ static void hppa_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     ctx->mmu_idx = MMU_USER_IDX;
     ctx->iaoq_f = ctx->base.pc_first | MMU_USER_IDX;
     ctx->iaoq_b = ctx->base.tb->cs_base | MMU_USER_IDX;
+    ctx->unalign = (ctx->tb_flags & TB_FLAG_UNALIGN ? MO_UNALN : MO_ALIGN);
 #else
     ctx->privilege = (ctx->tb_flags >> TB_FLAG_PRIV_SHIFT) & 3;
     ctx->mmu_idx = (ctx->tb_flags & PSW_D ? ctx->privilege : MMU_PHYS_IDX);
-- 
2.25.1