| Issue |
58101
|
| Summary |
[lld] Cannot pad ELF32 to 4GB
|
| Labels |
|
| Assignees |
|
| Reporter |
crawfxrd
|
`entry.S`:
```asm
.code16
.section .reset, "ax", %progbits
.code16
.global reset_vector
reset_vector:
hlt
jmp reset_vector
.align 0x10, 0xFF
```
`link.ld`:
```
OUTPUT_FORMAT("elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(reset_vector)
SECTIONS
{
/* Reset vector on IA32 starts at 16 bytes below 4 GiB */
. = 0xFFFFFFF0;
.reset : {
*(.reset)
}
/* NOTE: LLD requires shstrtab */
.shstrtab : { *(.shstrtab) }
.strtab : { *(.strtab) }
.symtab : { *(.symtab) }
/* Discard everything else */
/DISCARD/ : { *(*) }
}
```
Compiled with:
```
clang -fuse-ld=lld -m16 -ffreestanding -nostdlib -Wl,-Tlink.ld -Wl,--nmagic -Wl,--build-id=none -o entry.o entry.S
```
Error:
```
ld.lld: error: section .reset at 0xFFFFFFF0 of size 0x10 exceeds available address space
clang-14: error: linker command failed with exit code 1 (use -v to see invocation)
```
Section starting at 0xFFFF_FFF0 with a length of 16 bytes will have its last byte at 0xFFFF_FFFF. lld just adds the length to the start so it thinks it ends at 0x1_0000_0000, making it outside of the 4GB limit.
Caused by: 1fc9f39bd544dc757323d2ee8830134275e382ec
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