The Patch has some problem, Please RECALL it!
-----原始邮件----- 发件人:fa...@mail.ustc.edu.cn 发送时间:2023-01-01 23:57:06 (星期日) 收件人: qemu-devel@nongnu.org 抄送: qemu-devel@nongnu.org 主题: [PATCH] linux-user: fix bug about incorrect base addresss of idt and gdt on i386 and x86_64 From 4601a624f40b2c89e7df2dec1adffb4f4308ba2d Mon Sep 17 00:00:00 2001 From: fanwenjie <fa...@mail.ustc.edu.cn> Date: Sun, 1 Jan 2023 23:13:34 +0800 Subject: [PATCH] linux-user: fix bug about incorrect base addresss of idt and gdt on i386 and x86_64 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1405 Signed-off-by: fanwenjie <fa...@mail.ustc.edu.cn> --- linux-user/main.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/linux-user/main.c b/linux-user/main.c index a17fed045b..5d673c95b3 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -171,6 +171,12 @@ void fork_end(int child) __thread CPUState *thread_cpu; +#if defined(TARGET_I386) || defined(TARGET_X86_64) +#include <stdalign.h> +__thread alignas(TARGET_PAGE_SIZE) static uint64_t gdt_base[TARGET_GDT_ENTRIES]; +__thread alignas(TARGET_PAGE_SIZE) static uint64_t idt_base[TARGET_PAGE_SIZE / sizeof(uint64_t)]; +#endif + bool qemu_cpu_is_self(CPUState *cpu) { return thread_cpu == cpu; @@ -235,6 +241,13 @@ 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) + memcpy(idt_base, (void*)new_env->idt.base, sizeof(uint64_t) * (new_env->idt.limit + 1)); + memcpy(gdt_base, (void*)new_env->gdt.base, sizeof(uint64_t) * TARGET_GDT_ENTRIES); + new_env->idt.base = (target_ulong)idt_base; + new_env->gdt.base = (target_ulong)gdt_base; +#endif + /* Clone all break/watchpoints. Note: Once we support ptrace with hw-debug register access, make sure BP_CPU break/watchpoints are handled correctly on clone. */ -- 2.34.1