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more Example twiddling

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committer: jreiser <jreiser> 1089683530 +0000
This commit is contained in:
John Reiser 2004-07-13 01:52:10 +00:00
parent 754f10f0b0
commit f41edf9e21
1 changed files with 9 additions and 7 deletions
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16
src/p_vmlinx.cpp
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@ -429,19 +429,21 @@ void PackVmlinuxI386::unpack(OutputFile *fo)
//#include <asm/segment.h>
//
// .text
//startup_32: .globl startup_32 # In: %esi=0x90000
//startup_32: .globl startup_32 # In: %esi=0x90000 setup data "real_mode pointer"
// cli # but if it matters, then there is a race!
//
// movl $ __BOOT_DS,%eax # flat addressing, please
// movl %eax,%ss; movl %esi,%esp
// movl %eax,%ds
// movl $ __BOOT_DS,%eax
// movl %eax,%ss; movl $0x99000,%esp # 2.6.7 setup had ss:sp of 9000:8ffe
// /* Avoid EBDA (Extended BIOS Data Area) below 0xA0000. */
//
// pushl $0; popf # subsumes "cli; cld"; also clears NT for buggy BIOS
//
// movl %eax,%ds # all non-code segments identical
// movl %eax,%es
// movl %eax,%fs
// movl %eax,%gs
//
// pushl $0; popf # subsumes "cli; cld"; also clears NT for buggy BIOS
//
// movl $ startup_32,%eax # base address of uncompressed execution
// movl $ 0x100000,%eax # destination of uncompression (and entry point)
// pushl $ __BOOT_CS
///* Fall into .text of upx-compressed vmlinux. */
//-----