From: Miodrag Dinic <miodrag.di...@imgtec.com>
If executing ALIGN with shift count bp=0 within mips64 emulation,
the result of the operation should be sign extended.
Taken from the official documentation (pseudo code) :
ALIGN:
tmp_rt_hi = unsigned_word(GPR[rt]) << (8*bp)
tmp_rs_lo = unsigned_word(GPR[rs]) >> (8*(4-bp))
tmp = tmp_rt_hi || tmp_rt_lo
GPR[rd] = sign_extend.32(tmp)
Signed-off-by: Miodrag Dinic <miodrag.di...@imgtec.com>
Reviewed-by: Aurelien Jarno <aurel...@aurel32.net>
Reviewed-by: Leon Alrae <leon.al...@imgtec.com>
Signed-off-by: Leon Alrae <leon.al...@imgtec.com>
---
target-mips/translate.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/target-mips/translate.c b/target-mips/translate.c
index 5626647..d2443d3 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -4630,7 +4630,16 @@ static void gen_align(DisasContext *ctx, int opc, int
rd, int rs, int rt,
t0 = tcg_temp_new();
gen_load_gpr(t0, rt);
if (bp == 0) {
- tcg_gen_mov_tl(cpu_gpr[rd], t0);
+ switch (opc) {
+ case OPC_ALIGN:
+ tcg_gen_ext32s_tl(cpu_gpr[rd], t0);
+ break;
+#if defined(TARGET_MIPS64)
+ case OPC_DALIGN:
+ tcg_gen_mov_tl(cpu_gpr[rd], t0);
+ break;
+#endif
+ }
} else {
TCGv t1 = tcg_temp_new();
gen_load_gpr(t1, rs);
--
2.1.0
