From 801f4dac57dad6b340ff3f60c5d9b045a2c68a0e Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Sun, 2 Jul 2017 20:34:55 +0200 Subject: [PATCH] target/sh4: fix FPSCR cause vs flag inversion The floating-point status/control register contains cause and flag bits. The cause bits are set to 0 before executing the instruction, while the flag bits hold the status of the exception generated after the field was last cleared. Message-Id: <20170702202814.27793-4-aurelien@aurel32.net> Reviewed-by: Richard Henderson Signed-off-by: Aurelien Jarno --- target/sh4/op_helper.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/target/sh4/op_helper.c b/target/sh4/op_helper.c index f228daf125..f2e39c5ca6 100644 --- a/target/sh4/op_helper.c +++ b/target/sh4/op_helper.c @@ -219,29 +219,29 @@ static void update_fpscr(CPUSH4State *env, uintptr_t retaddr) xcpt = get_float_exception_flags(&env->fp_status); - /* Clear the flag entries */ - env->fpscr &= ~FPSCR_FLAG_MASK; + /* Clear the cause entries */ + env->fpscr &= ~FPSCR_CAUSE_MASK; if (unlikely(xcpt)) { if (xcpt & float_flag_invalid) { - env->fpscr |= FPSCR_FLAG_V; + env->fpscr |= FPSCR_CAUSE_V; } if (xcpt & float_flag_divbyzero) { - env->fpscr |= FPSCR_FLAG_Z; + env->fpscr |= FPSCR_CAUSE_Z; } if (xcpt & float_flag_overflow) { - env->fpscr |= FPSCR_FLAG_O; + env->fpscr |= FPSCR_CAUSE_O; } if (xcpt & float_flag_underflow) { - env->fpscr |= FPSCR_FLAG_U; + env->fpscr |= FPSCR_CAUSE_U; } if (xcpt & float_flag_inexact) { - env->fpscr |= FPSCR_FLAG_I; + env->fpscr |= FPSCR_CAUSE_I; } - /* Accumulate in cause entries */ - env->fpscr |= (env->fpscr & FPSCR_FLAG_MASK) - << (FPSCR_CAUSE_SHIFT - FPSCR_FLAG_SHIFT); + /* Accumulate in flag entries */ + env->fpscr |= (env->fpscr & FPSCR_CAUSE_MASK) + >> (FPSCR_CAUSE_SHIFT - FPSCR_FLAG_SHIFT); /* Generate an exception if enabled */ cause = (env->fpscr & FPSCR_CAUSE_MASK) >> FPSCR_CAUSE_SHIFT;