Example provided in the launchpad bug fails with:
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
Illegal instruction (core dumped)
It appears fetoxm1 is not implemented:
IN: expm1f
0x800005cc: fetoxm1x %fp2,%fp0
Disassembler disagrees with translator over instruction decoding
Please report this to qemu-devel@nongnu.org
(gdb) x/2hx 0x800005cc
0x800005cc: 0xf200 0x0808
This patch adds the instruction.
Bug: https://bugs.launchpad.net/qemu/+bug/1881450
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
target/m68k/helper.h | 1 +
target/m68k/fpu_helper.c | 5 +++++
target/m68k/translate.c | 3 +++
3 files changed, 9 insertions(+)
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index feee7be62655..77808497a95c 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -83,6 +83,7 @@ DEF_HELPER_3(fatan, void, env, fp, fp)
DEF_HELPER_3(fasin, void, env, fp, fp)
DEF_HELPER_3(facos, void, env, fp, fp)
DEF_HELPER_3(fatanh, void, env, fp, fp)
+DEF_HELPER_3(fetoxm1, void, env, fp, fp)
DEF_HELPER_3(ftanh, void, env, fp, fp)
DEF_HELPER_3(fsinh, void, env, fp, fp)
DEF_HELPER_3(fcosh, void, env, fp, fp)
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index 36e6c704d1d0..9acf60dfd443 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -641,6 +641,11 @@ void HELPER(fatanh)(CPUM68KState *env, FPReg *res, FPReg *val)
res->d = floatx80_atanh(val->d, &env->fp_status);
}
+void HELPER(fetoxm1)(CPUM68KState *env, FPReg *res, FPReg *val)
+{
+ res->d = floatx80_etoxm1(val->d, &env->fp_status);
+}
+
void HELPER(ftanh)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_tanh(val->d, &env->fp_status);
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 0f80888203d3..db4e69bac195 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -5146,6 +5146,9 @@ DISAS_INSN(fpu)
case 0x06: /* flognp1 */
gen_helper_flognp1(cpu_env, cpu_dest, cpu_src);
break;
+ case 0x08: /* fetoxm1 */
+ gen_helper_fetoxm1(cpu_env, cpu_dest, cpu_src);
+ break;
case 0x09: /* ftanh */
gen_helper_ftanh(cpu_env, cpu_dest, cpu_src);
break;
--
2.26.2