2005-11-11 Gwenole Beauchesne * Globaaly save %ebx, %esi, %edi on entry to generated function. This avoids some register spills in synthetic opcodes. NOTE: this also easily fixes gcc4 compiled qemu-system-x86_64 on x86. --- qemu-0.7.2/cpu-exec.c.gcc4-opts 2005-09-04 19:11:31.000000000 +0200 +++ qemu-0.7.2/cpu-exec.c 2005-11-11 17:40:47.000000000 +0100 @@ -561,6 +561,15 @@ int cpu_exec(CPUState *env1) : /* no outputs */ : "r" (gen_func) : "r1", "r2", "r3", "r8", "r9", "r10", "r12", "r14"); +#elif defined(TARGET_X86_64) && defined(__i386__) + asm volatile ("push %%ebx\n" + "push %%esi\n" + "push %%edi\n" + "call *%0\n" + "pop %%edi\n" + "pop %%esi\n" + "pop %%ebx\n" + : : "r" (gen_func) : "ebx", "esi", "edi"); #elif defined(TARGET_I386) && defined(USE_CODE_COPY) { if (!(tb->cflags & CF_CODE_COPY)) { --- qemu-0.7.2/Makefile.target.gcc4-opts 2005-11-11 16:26:33.000000000 +0100 +++ qemu-0.7.2/Makefile.target 2005-11-11 17:59:56.000000000 +0100 @@ -65,6 +65,10 @@ OP_CFLAGS+= -falign-functions=0 -fno-gcs else OP_CFLAGS+= -malign-functions=0 endif +ifeq ($(TARGET_ARCH), x86_64) +# XXX globally save %ebx, %esi, %edi on entry to generated function +OP_CFLAGS+= -fcall-used-ebx -fcall-used-esi -fcall-used-edi +endif ifdef TARGET_GPROF USE_I386_LD=y