[PULL,10/31] target/m68k: Initialize float_status fields in gdb set/get functions

Commit Message

Peter Maydell Nov. 5, 2024, 11:19 a.m. UTC

In cf_fpu_gdb_get_reg() and cf_fpu_gdb_set_reg() we use a temporary
float_status variable to pass to floatx80_to_float64() and
float64_to_floatx80(), but we don't initialize it, meaning that those
functions could access uninitialized data.  Zero-init the structs.

(We don't need to set a NaN-propagation rule here because we
don't use these with a 2-argument fpu operation.)

Signed-off-by: Peter Maydell <[e-mail]>
Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Reviewed-by: Richard Henderson <[e-mail]>
Message-id: [e-mail]
---
 target/m68k/helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/target/m68k/helper.c b/target/m68k/helper.c
index 9d3db8419de..9bfc6ae97c0 100644
--- a/target/m68k/helper.c
+++ b/target/m68k/helper.c
@@ -36,7 +36,7 @@  static int cf_fpu_gdb_get_reg(CPUState *cs, GByteArray *mem_buf, int n)
     CPUM68KState *env = &cpu->env;
 
     if (n < 8) {
-        float_status s;
+        float_status s = {};
         return gdb_get_reg64(mem_buf, floatx80_to_float64(env->fregs[n].d, &s));
     }
     switch (n) {
@@ -56,7 +56,7 @@  static int cf_fpu_gdb_set_reg(CPUState *cs, uint8_t *mem_buf, int n)
     CPUM68KState *env = &cpu->env;
 
     if (n < 8) {
-        float_status s;
+        float_status s = {};
         env->fregs[n].d = float64_to_floatx80(ldq_be_p(mem_buf), &s);
         return 8;
     }