-----原始邮件-----
发件人:fanwj@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 <fanwj@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 <fanwj@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