------- Additional Comments From hjl at lucon dot org 2007-02-23 13:09 -------
Linker should issue an error when a section is placed into a segment
improperly:
[EMAIL PROTECTED] objcopy-2]$ cat foo.t
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
PHDRS {
text PT_LOAD FLAGS(5); /* R_E */
data PT_LOAD FLAGS(7); /* RWE */
}
SECTIONS
{
. = 0xC0000000 + ((0x100000 + (0x100000 - 1)) & ~(0x100000 - 1));
.bar : AT(ADDR(.bar) - 0xC0000000) { *(.bar) } :text
.bss : AT(ADDR(.bss) - 0xC0000000) { *(.bss) }
.foo 0 : AT(ADDR(.bss) + SIZEOF(.bss) - 0xC0000000) { *(.foo) } :text
/DISCARD/ : { *(.*) }
}
[EMAIL PROTECTED] objcopy-2]$ cat foo.s
.section .bar,"ax","progbits"
.byte 0
.section .foo,"aw","progbits"
.byte 0
.bss
.long 0
[EMAIL PROTECTED] objcopy-2]$ make copy
as --32 -o foo.o foo.s
./ld -m elf_i386 -o foo -T foo.t foo.o
objcopy foo foo-cpy
BFD: foo-cpy: warning: allocated section `.foo' not in segment
[EMAIL PROTECTED] objcopy-2]$ make
readelf -lS foo
There are 7 section headers, starting at offset 0x1034:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .bar PROGBITS c0100000 001000 000001 00 AX 0 0 1
[ 2] .bss NOBITS c0100004 001001 000004 00 WA 0 0 4
[ 3] .foo PROGBITS 00000000 001008 000001 00 WA 0 0 1
[ 4] .shstrtab STRTAB 00000000 001009 00002a 00 0 0 1
[ 5] .symtab SYMTAB 00000000 00114c 000040 10 6 4 4
[ 6] .strtab STRTAB 00000000 00118c 000001 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
Elf file type is EXEC (Executable file)
Entry point 0x0
There are 1 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x001000 0xc0100000 0x00100000 0x00009 0x00010 R E 0x1000
Section to Segment mapping:
Segment Sections...
00 .bar .bss
[EMAIL PROTECTED] objcopy-2]$
--
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |
Summary|problems with linker / strip|Linker failed to issue an
|/ BFD |error on bad section in
| |segment
Version|2.17 |2.18 (HEAD)
http://sourceware.org/bugzilla/show_bug.cgi?id=4007
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