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target/m68k: implement opcode fetoxm1

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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>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200531131951.631902-1-laurent@vivier.eu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2020-05-31 15:19:51 +02:00
parent 6a0e8bb495
commit 250b1da35d
3 changed files with 9 additions and 0 deletions
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5
target/m68k/fpu_helper.c
View File

@ -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);

1
target/m68k/helper.h
View File

@ -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)

3
target/m68k/translate.c
View File

@ -5160,6 +5160,9 @@ 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;