https://sourceware.org/bugzilla/show_bug.cgi?id=24490
Bug ID: 24490
Summary: -z max-page-size=0x200000 -z separate-code creates
huge binary
Product: binutils
Version: 2.33 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-cfl-1 max-page-size]$ cat foo.c
int data = 3;
int
foo (void)
{
return data;
}
[hjl@gnu-cfl-1 max-page-size]$ make
gcc -g -Wall -fpic -c -o foo.o foo.c
./ld -z max-page-size=0x200000 -m elf_x86_64 -z separate-code -shared -o
libfoo2.so foo.o
readelf -lW libfoo2.so
Elf file type is DYN (Shared object file)
Entry point 0x200000
There are 9 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x0002e8
0x0002e8 R 0x200000
LOAD 0x200000 0x0000000000200000 0x0000000000200000 0x00000f
0x00000f R E 0x200000
LOAD 0x400000 0x0000000000400000 0x0000000000400000 0x000068
0x000068 R 0x200000
LOAD 0x400f08 0x0000000000600f08 0x0000000000600f08 0x000114
0x000114 RW 0x200000
DYNAMIC 0x400f08 0x0000000000600f08 0x0000000000600f08 0x0000f0
0x0000f0 RW 0x8
NOTE 0x400000 0x0000000000400000 0x0000000000400000 0x000030
0x000030 R 0x8
GNU_PROPERTY 0x400000 0x0000000000400000 0x0000000000400000 0x000030
0x000030 R 0x8
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x10
GNU_RELRO 0x400f08 0x0000000000600f08 0x0000000000600f08 0x0000f8
0x0000f8 R 0x1
Section to Segment mapping:
Segment Sections...
00 .hash .gnu.hash .dynsym .dynstr .rela.dyn
01 .text
02 .note.gnu.property .eh_frame
03 .dynamic .got .got.plt .data
04 .dynamic
05 .note.gnu.property
06 .note.gnu.property
07
08 .dynamic .got
ls -l libfoo2.so
-rwxrwxr-x 1 hjl hjl 4201160 Apr 26 08:14 libfoo2.so
[hjl@gnu-cfl-1 max-page-size]$
Since all PT_LOAD segments are very small, they can be fit into a
single 4K or 2MB page. Ld should use the smallest of minpagesize
and maxpagesize which can cover the whole PT_LOAD segment.
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