From 25af08ecf4c16557d35c68bd913f9b793f229e4c Mon Sep 17 00:00:00 2001
From: TermiNexus <wyt18222152539wyt@163.com>
Date: Sat, 29 Aug 2026 18:00:13 +0800
Subject: [PATCH] =?UTF-8?q?debug(kernel):=20=E4=BF=9D=E5=AD=98=E5=B9=B6?=
 =?UTF-8?q?=E6=89=93=E5=8D=B0=E5=B4=A9=E6=BA=83=E6=97=B6=20RAX=EF=BC=88?=
 =?UTF-8?q?=E9=AA=8C=E8=AF=81=20cr2=3Drax-=E5=81=8F=E7=A7=BB=20=E5=85=B3?=
 =?UTF-8?q?=E7=B3=BB=EF=BC=89?=
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[STK] 显示崩溃帧 rbp=0x7d640 正常，但 cr2=0x0 需 rax=0x6f0——矛盾待解。isr.s 新增 _fault_rax，异常打印 [RAX] 行确认崩溃时 rax 真实值。
---
 VKernel/Kernel/intr/idt.vp | 14 ++++++++++++++
 VKernel/Kernel/intr/isr.s  |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/VKernel/Kernel/intr/idt.vp b/VKernel/Kernel/intr/idt.vp
index 1686761..2b319d2 100644
--- a/VKernel/Kernel/intr/idt.vp
+++ b/VKernel/Kernel/intr/idt.vp
@@ -124,6 +124,13 @@ def isrCommonhandler(interrupt: t.CInt):
         buf: t.CArray[t.CChar, 100]
         viperlib.snprintf(c.Addr(buf), 100, "[PF] cr2=0x%lx rip=0x%lx err=0x%lx rsp=0x%lx\n", cr2, fault_rip, fault_err, fault_rsp)
         serial.puts(buf)
+        # [RAX] 崩溃时 rax（isr.s 保存）：定位 cr2 与 rax 关系（rax-偏移=cr2）
+        f_rax: t.CUInt64T = 0
+        c.Asm(f"""mov {c.AsmOut(f_rax, t.ASM_DESCR.OUTPUT_REG)}, [_fault_rax]""",
+              op=[t.ASM_DESCR.CLOBBER_RAX])
+        rax_buf: t.CArray[t.CChar, 80]
+        viperlib.snprintf(c.Addr(rax_buf), 80, "[RAX] rax=0x%lx\n", f_rax)
+        serial.puts(rax_buf)
         # [STK] rbp 链回溯（定位栈损坏源：崩溃帧 + 4 级调用链的返回地址）
         fr0: t.CUInt64T = 0
         fr1: t.CUInt64T = 0
@@ -177,6 +184,13 @@ def isrCommonhandler(interrupt: t.CInt):
         ex_buf: t.CArray[t.CChar, 100]
         viperlib.snprintf(c.Addr(ex_buf), 100, "[EX] int=%d rip=0x%lx rsp=0x%lx\n", interrupt, ex_rip, ex_rsp)
         serial.puts(ex_buf)
+        # [RAX] 崩溃时 rax（isr.s 保存）
+        f_rax: t.CUInt64T = 0
+        c.Asm(f"""mov {c.AsmOut(f_rax, t.ASM_DESCR.OUTPUT_REG)}, [_fault_rax]""",
+              op=[t.ASM_DESCR.CLOBBER_RAX])
+        rax_buf: t.CArray[t.CChar, 80]
+        viperlib.snprintf(c.Addr(rax_buf), 80, "[RAX] rax=0x%lx\n", f_rax)
+        serial.puts(rax_buf)
         # [STK] rbp 链回溯（与 #PF 分支一致，定位栈损坏源）
         fr0: t.CUInt64T = 0
         fr1: t.CUInt64T = 0
diff --git a/VKernel/Kernel/intr/isr.s b/VKernel/Kernel/intr/isr.s
index a710b14..f695f60 100644
--- a/VKernel/Kernel/intr/isr.s
+++ b/VKernel/Kernel/intr/isr.s
@@ -10,6 +10,7 @@
 .comm _fault_err, 8, 8
 .comm _fault_rsp, 8, 8
 .comm _fault_rbp, 8, 8
+.comm _fault_rax, 8, 8
 
 .section .text
 .intel_syntax noprefix
@@ -92,6 +93,7 @@ isr\num\()_frame_ready:
 
     # Push all general-purpose registers
     push rax
+    mov [_fault_rax], rax
     push rbx
     push rdx
     push rsi
@@ -277,6 +279,7 @@ isr\num\()_frame_ready:
 
     # Push all general-purpose registers
     push rax
+    mov [_fault_rax], rax
     push rbx
     push rsi
     push rdi