grub4dos/ntloader
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check whether the code overlaps the EBDA region

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a1ive 2025-02-16 11:46:39 +09:00
parent d9f2e7568f
commit 9ff52bf73a
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1 changed files with 29 additions and 1 deletions
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30
script.lds
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@ -1,5 +1,24 @@
ENTRY ( efi_main )
/* x86 Memory Map
* start end size description type
* 640 KiB Low memory
* 0x00000000 0x000003FF 1 KiB IVT
* 0x00000400 0x000004FF 256 bytes BDA
* 0x00000500 0x00007BFF 29.75 KiB Conventional memory
* 0x00007C00 0x00007DFF 512 bytes BootSector
* 0x00007E00 0x0007FFFF 480.5 KiB Conventional memory
* 0x00080000 0x0009FFFF ~128 KiB EBDA
* 384 KiB Upper Memory
* 0x000A0000 0x000BFFFF 128 KiB Video display memory
* 0x000C0000 0x000C7FFF ~32 KiB Video BIOS
* 0x000C8000 0x000EFFFF ~160 KiB BIOS Expansions
* 0x000F0000 0x000FFFFF 64 KiB Motherboard BIOS
* > 1 MiB High Memory
* 0x00100000 0x00EFFFFF 14 MiB Extended memory
* 0x00F00000 0x00FFFFFF 1 MiB ISA Memory Hole
*/
SECTIONS {
/* Align sections to allow for page-level runtime protection */
@ -18,6 +37,9 @@ SECTIONS {
_forbidden_start = 0x30000;
_forbidden_end = 0x40000;
/* Extended BIOS Data Area */
_ebda_start = 0x80000;
/* bzImage prefix */
_prefix_pos = 0;
.prefix : AT ( _prefix_pos ) {
@ -72,12 +94,14 @@ SECTIONS {
*.i386.*(.text)
*.i386.*(.text.*)
ASSERT ( ABSOLUTE ( . ) <= ABSOLUTE ( _forbidden_start ),
"Binary is too large" );
"Binary is too large (overlap the bootmgr buffer)" );
*(.text)
*(.text.*)
. = ALIGN ( alignment );
_epayload = .;
_etext = .;
ASSERT ( ABSOLUTE ( . ) <= ABSOLUTE ( _ebda_start ),
"Binary is too large (overlap the EBDA)" );
}
_text_len = ABSOLUTE ( _etext ) - ABSOLUTE ( _text );
_payload_len = ABSOLUTE ( _epayload ) - ABSOLUTE ( _payload );
@ -93,6 +117,8 @@ SECTIONS {
*(.stack.*)
. = ALIGN ( alignment );
_ebss = .;
ASSERT ( ABSOLUTE ( . ) <= ABSOLUTE ( _ebda_start ),
"Binary is too large (overlap the EBDA)" );
}
_bss_len = ABSOLUTE ( _ebss ) - ABSOLUTE ( _bss );
@ -103,6 +129,8 @@ SECTIONS {
*(.sbat)
*(.sbat.*)
_esbat = .;
ASSERT ( ABSOLUTE ( . ) <= ABSOLUTE ( _ebda_start ),
"Binary is too large (overlap the EBDA)" );
}
_sbat_len = ABSOLUTE ( _esbat ) - ABSOLUTE ( _sbat );