From 214c6002d0263bce2225e23983e58d36740a6e1d Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Tue, 13 Sep 2022 15:28:18 +0100 Subject: target/m68k: Perform writback before modifying SR Writes to SR may change security state, which may involve a swap of %ssp with %usp as reflected in %a7. Finish the writeback of %sp@+ before swapping stack pointers. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1206 Signed-off-by: Richard Henderson Reviewed-by: Laurent Vivier Reviewed-by: Mark Cave-Ayland Message-Id: <20220913142818.7802-3-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier --- target/m68k/translate.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'target/m68k') diff --git a/target/m68k/translate.c b/target/m68k/translate.c index c9bb053..4640ead 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -2285,9 +2285,9 @@ static void gen_set_sr_im(DisasContext *s, uint16_t val, int ccr_only) tcg_gen_movi_i32(QREG_CC_N, val & CCF_N ? -1 : 0); tcg_gen_movi_i32(QREG_CC_X, val & CCF_X ? 1 : 0); } else { - TCGv sr = tcg_const_i32(val); - gen_helper_set_sr(cpu_env, sr); - tcg_temp_free(sr); + /* Must writeback before changing security state. */ + do_writebacks(s); + gen_helper_set_sr(cpu_env, tcg_constant_i32(val)); } set_cc_op(s, CC_OP_FLAGS); } @@ -2297,6 +2297,8 @@ static void gen_set_sr(DisasContext *s, TCGv val, int ccr_only) if (ccr_only) { gen_helper_set_ccr(cpu_env, val); } else { + /* Must writeback before changing security state. */ + do_writebacks(s); gen_helper_set_sr(cpu_env, val); } set_cc_op(s, CC_OP_FLAGS); -- cgit v1.1