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[build] Fix building on older versions of binutils

Some older versions of binutils have issues with both the use of
PROVIDE() and the interpretation of numeric literals within a section
description.

Work around these older versions by defining the required numeric
literals outside of any section description, and by automatically
determining whether or not to generate extra space for page tables
rather than relying on LDFLAGS.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 8 년 전
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2개의 변경된 파일20개의 추가작업 그리고 10개의 파일을 삭제
  1. 20
    6
      src/arch/x86/scripts/pcbios.lds
  2. 0
    4
      src/arch/x86_64/Makefile.pcbios

+ 20
- 6
src/arch/x86/scripts/pcbios.lds 파일 보기

@@ -27,10 +27,18 @@ SECTIONS {
27 27
     PROVIDE ( _max_align = 16 );
28 28
 
29 29
     /*
30
-     * Default to not generating space for page tables
30
+     * Values used in page table calculations
31
+     *
32
+     * On older versions of ld (without the SANE_EXPR feature),
33
+     * numeric literals within a section description tend to be
34
+     * interpreted as section-relative symbols.
31 35
      *
32 36
      */
33
-    PROVIDE ( _use_page_tables = 0 );
37
+    _page_size = 4096;
38
+    _page_size_1 = ( _page_size - 1 );
39
+    _pte_size = 8;
40
+    _pte_count = ( _page_size / _pte_size );
41
+    _pte_count_1 = ( _pte_count - 1 );
34 42
 
35 43
     /*
36 44
      * Allow decompressor to require a minimum amount of temporary stack
@@ -133,12 +141,18 @@ SECTIONS {
133 141
 	*(COMMON)
134 142
 	*(.stack)
135 143
 	*(.stack.*)
144
+	_pages = .;
136 145
 	*(.pages)
137 146
 	*(.pages.*)
138
-	_textdata_paged_len = ABSOLUTE ( . - _textdata );
139
-	_textdata_ptes = ABSOLUTE ( ( _textdata_paged_len + 4095 ) / 4096 );
140
-	_textdata_pdes = ABSOLUTE ( ( _textdata_ptes + 511 ) / 512 );
141
-	. += ( _use_page_tables ? ( _textdata_pdes * 4096 ) : 0 );
147
+	_use_page_tables = ABSOLUTE ( . ) - ABSOLUTE ( _pages );
148
+	_textdata_paged_len =
149
+	    ABSOLUTE ( ABSOLUTE ( . ) - ABSOLUTE ( _textdata ) );
150
+	_textdata_ptes =
151
+	    ABSOLUTE ( ( _textdata_paged_len + _page_size_1 ) / _page_size );
152
+	_textdata_pdes =
153
+	    ABSOLUTE ( ( _textdata_ptes + _pte_count_1 ) / _pte_count );
154
+	. += ( _use_page_tables ? ( _textdata_pdes * _page_size ) : 0 );
155
+	_epages = .;
142 156
 	_etextdata = .;
143 157
     }
144 158
     _textdata_filesz	= ABSOLUTE ( _mtextdata ) - ABSOLUTE ( _textdata );

+ 0
- 4
src/arch/x86_64/Makefile.pcbios 파일 보기

@@ -9,10 +9,6 @@ LDFLAGS		+= --section-start=.textdata=0xffffffffeb000000
9 9
 #
10 10
 CFLAGS		+= -mno-red-zone
11 11
 
12
-# Generate extra space for page tables to cover .textdata
13
-#
14
-LDFLAGS		+= --defsym=_use_page_tables=1
15
-
16 12
 # Include generic BIOS Makefile
17 13
 #
18 14
 MAKEDEPS	+= arch/x86/Makefile.pcbios

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