[PATCH v2 4/6] target/hppa: exit tb on flush cache instructions

[Sven Schnelle <svens@stackframe.org>]

When the guest modifies the tb it is currently executing from,
it executes a fic instruction. Exit the tb on such instruction,
otherwise we might execute stale code.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
---
 target/hppa/insns.decode |  6 +++---
 target/hppa/translate.c  | 11 +++++++++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/target/hppa/insns.decode b/target/hppa/insns.decode
index f5a3f02fd1..409e3ea9c9 100644
--- a/target/hppa/insns.decode
+++ b/target/hppa/insns.decode
@@ -143,9 +143,9 @@ getshadowregs   1111 1111 1111 1101 1110 1010 1101 0010
 nop             000001 ----- ----- -- 11001010 0 -----         # fdc, disp
 nop_addrx       000001 ..... ..... -- 01001010 . -----  @addrx # fdc, index
 nop_addrx       000001 ..... ..... -- 01001011 . -----  @addrx # fdce
-nop_addrx       000001 ..... ..... --- 0001010 . -----  @addrx # fic 0x0a
-nop_addrx       000001 ..... ..... -- 01001111 . 00000  @addrx # fic 0x4f
-nop_addrx       000001 ..... ..... --- 0001011 . -----  @addrx # fice
+fic             000001 ..... ..... --- 0001010 . -----  @addrx # fic 0x0a
+fic             000001 ..... ..... -- 01001111 . 00000  @addrx # fic 0x4f
+fic             000001 ..... ..... --- 0001011 . -----  @addrx # fice
 nop_addrx       000001 ..... ..... -- 01001110 . 00000  @addrx # pdc
 
 probe           000001 b:5 ri:5 sp:2 imm:1 100011 write:1 0 t:5
diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index 8ba31567e8..46da546eb9 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -2293,6 +2293,17 @@ static bool trans_nop_addrx(DisasContext *ctx, arg_ldst *a)
     return true;
 }
 
+static bool trans_fic(DisasContext *ctx, arg_fic *a)
+{
+    arg_ldst b;
+
+    b.b = a->b;
+    b.x = a->x;
+    b.m = a->m;
+    ctx->base.is_jmp = DISAS_IAQ_N_STALE;
+    return trans_nop_addrx(ctx, &b);
+}
+
 static bool trans_probe(DisasContext *ctx, arg_probe *a)
 {
     TCGv_i64 dest, ofs;
-- 
2.43.2