From 0fd506ff7155de63d01a6d777ba322a6e173ae4c Mon Sep 17 00:00:00 2001
From: zhaoyanbai <zhaoyanbai@126.com>
Date: Sat, 3 Oct 2026 12:35:17 +0800
Subject: [PATCH] =?utf8?q?=E5=9C=A8ring3=E4=B8=AD=E8=A7=A6=E5=8F=91#PF?=
MIME-Version: 1.0
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---
 kernel/ring3.S     | 5 +++++
 kernel/task_user.c | 7 +++++++
 scripts/link.ld    | 9 +++++++++
 3 files changed, 21 insertions(+)

diff --git a/kernel/ring3.S b/kernel/ring3.S
index 5774685..9ec9176 100644
--- a/kernel/ring3.S
+++ b/kernel/ring3.S
@@ -10,6 +10,8 @@
 #define ASM
 #include <syscall.h>
 
+.extern ring3_c_text
+
 # a allocatable 可分配，表示这个节在程序运行时需要加载到内存中
 # x executable  可执行，表示这个节包含可执行的代码
 # w writable    可写，通常用于数据节
@@ -58,6 +60,9 @@ ring3_entry:
     addl    $0x18, %esp
 
 
+    call    ring3_c_text
+
+
     # 纯消耗CPU时间
     movl    $0xFF0F0F0F, %ecx
 1:
diff --git a/kernel/task_user.c b/kernel/task_user.c
index 31ee601..73fdf66 100644
--- a/kernel/task_user.c
+++ b/kernel/task_user.c
@@ -61,3 +61,10 @@ void user_task_entry() {
 
     asm volatile("sysexit;" ::"d"(ring3_page_vaddr), "c"(ring3_stack_top_vaddr));
 }
+
+// 用于触发#PF以验证COW
+__attribute__((__section__(".ring3.data"))) uint32_t ring3_x = 0;
+__attribute__((__section__(".ring3.text"))) void ring3_c_text() {
+    asm("nop;nop;nop;nop;nop;nop;nop;nop;");
+    ring3_x += 1;
+}
diff --git a/scripts/link.ld b/scripts/link.ld
index d80f375..d91f95a 100644
--- a/scripts/link.ld
+++ b/scripts/link.ld
@@ -64,6 +64,7 @@ SECTIONS
     {
         ring3_page_begin = .;
         *(.ring3.entry)
+        *(.ring3.text)
         . = ALIGN(0x100);
         ring3_text_size = SIZEOF(.ring3);
         ring3_page_end = .;
@@ -72,6 +73,14 @@ SECTIONS
     /* 带绝对 VMA 的节写完后 . 不会自动接上，而是变成 该节VMA+SIZEOF(该节名) */
     . = ring3_lma + SIZEOF(.ring3);
 
+    . = ALIGN(0x1000);
+    ring3_data_lma = .;
+    .ring3_data 0x10000000 : AT(ring3_data_lma)
+    {
+        *(.ring3.data)
+    }
+    . = ring3_data_lma + SIZEOF(.ring3_data);
+
     . = ALIGN(0x1000);
     /* . = kernel_begin; */
     . += kernel_virtual_addr_start;
-- 
2.55.0