Question

最初x64 vmlinux入口点是：

Entry point address:               0x1000000

我将Multiboot标头定义为单独的部分，然后在链接描述文件的.text开头链接该部分。在此入口点之后是：

Entry point address:               0x1000010

使用旧的入口地址，我能够从我的引导加载程序跳转到内核入口点并且它成功启动，但是我希望我的vmlinux成为多引导投诉（所以我需要那个头文件）但是在添加它并执行跳转到新地址后，它就会挂起..

跳转地址不正确还是我需要更改内核中的内容？ --- a / arch / x86 / kernel / head_64.S +++ b / arch / x86 / kernel / head_64.S

+.section .mboot
+.code64
+   /* Align 32 bits boundary.  */
+   .align  8
+   /* Multiboot header.  */
+multiboot_header:
+   /* magic */
+   .long   MULTIBOOT_HEADER_MAGIC
+   /* flags */
+   .long   MULTIBOOT_HEADER_FLAGS
+   /* checksum */
+   .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)

.text
__HEAD
.code64
.globl startup_64
startup_64:

--- a / arch / x86 / kernel / vmlinux.lds.S +++ b / arch / x86 / kernel / vmlinux.lds.S

@@ -91,6 +91,7 @@ SECTIONS
/* Text and read-only data */
    .text :  AT(ADDR(.text) - LOAD_OFFSET) {
+       *(.mboot)
    _text = .;
    /* bootstrapping code */
    HEAD_TEXT

objdump -d

Disassembly of section .text:

ffffffff81000000 <multiboot_header>:
ffffffff81000000:       02 b0 ad 1b 03 00       add    0x31bad(%rax),%dh
ffffffff81000006:       00 00                   add    %al,(%rax)
ffffffff81000008:       fb                      sti
ffffffff81000009:       4f 52                   rex.WRXB push %r10
ffffffff8100000b:       e4 90                   in     $0x90,%al

ffffffff8100000c <_text>:
ffffffff8100000c:       90                      nop
ffffffff8100000d:       90                      nop
ffffffff8100000e:       90                      nop
ffffffff8100000f:       90                      nop

ffffffff81000010 <startup_64>:
ffffffff81000010:       e8 a4 01 00 00          callq  ffffffff810001b9 <verify_cpu>
ffffffff81000015:       48 8d 2d f0 ff ff ff    lea    -0x10(%rip),%rbp        # 
ffffffff8100000c <_text>
ffffffff8100001c:       48 81 ed 0c 00 00 01    sub    $0x100000c,%rbp
ffffffff81000023:       48 89 e8                mov    %rbp,%rax
ffffffff81000026:       25 ff ff 1f 00          and    $0x1fffff,%eax

System.map：

0000000001000010 A phys_startup_64
ffffffff81000000 t multiboot_header
ffffffff8100000c T _text
ffffffff81000010 T startup_64

multiboot标题移动入口点

0 个答案: