From bdadc0b5b6c396a77c9faed8eb6829789bfb6151 Mon Sep 17 00:00:00 2001 From: malc Date: Thu, 2 Oct 2008 20:02:27 +0000 Subject: [PATCH] Do not use load_seg_vm to load CS in real mode iret handling load_seg_vm calls cpu_x86_load_seg_cache which updates hflags of current env, real hardware doesn't do this, nor the code that handles real mode lret/lcall/ljmp. This unbreaks "unreal mode" and makes QEMU the first emulator being able to run Project Angel demo by IMPACT Studios. (Not that there are many physical machines out there capable of doing the same) git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5403 c046a42c-6fe2-441c-8c8c-71466251a162 --- target-i386/op_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c index 32952b3a63..e9a6942440 100644 --- a/target-i386/op_helper.c +++ b/target-i386/op_helper.c @@ -2651,7 +2651,8 @@ void helper_iret_real(int shift) POPW(ssp, sp, sp_mask, new_eflags); } ESP = (ESP & ~sp_mask) | (sp & sp_mask); - load_seg_vm(R_CS, new_cs); + env->segs[R_CS].selector = new_cs; + env->segs[R_CS].base = (new_cs << 4); env->eip = new_eip; if (env->eflags & VM_MASK) eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK | NT_MASK; -- 2.11.4.GIT