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linux-user: fix bug about incorrect base addresss of gdt on i386 and x86_64

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On linux user mode, CPUX86State::gdt::base from Different CPUX86State
Objects have same value, It is incorrect! Every CPUX86State::gdt::base
Must points to independent memory space.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1405
Signed-off-by: fanwenjie <fanwj@mail.ustc.edu.cn>
Message-Id: <4172b90.58b08.18631b77860.Coremail.fanwj@mail.ustc.edu.cn>
[lv: remove unnecessary casts, split overlong line]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
fanwj@mail.ustc.edu.cn 2023-02-08 23:49:12 +08:00 • committed by Laurent Vivier
parent e64c6d42b6
commit 2732c739d8
2 changed files with 17 additions and 0 deletions
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8
linux-user/main.c
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@ -238,6 +238,14 @@ CPUArchState *cpu_copy(CPUArchState *env)
new_cpu->tcg_cflags = cpu->tcg_cflags;
memcpy(new_env, env, sizeof(CPUArchState));
#if defined(TARGET_I386) || defined(TARGET_X86_64)
new_env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
memcpy(g2h_untagged(new_env->gdt.base), g2h_untagged(env->gdt.base),
sizeof(uint64_t) * TARGET_GDT_ENTRIES);
OBJECT(new_cpu)->free = OBJECT(cpu)->free;
#endif
/* Clone all break/watchpoints.
Note: Once we support ptrace with hw-debug register access, make sure