CODEWITHSUNDEEP
ldriscvbare-metal
gudenau
gudenau

Reputation: 530

RISC-V 64gc LD Truncated Relocation: R_RISCV_PCREL_HI20

I can not get ld to link a very simple program because of a truncated relocation.

(init+0x0): relocation truncated to fit: R_RISCV_PCREL_HI20 against symbol `globalPointer' defined in .bss section in out/bootloader.elf

An example assembly file that creates this issue:

.section init

.global start
.type start, @function
start:
    la gp, globalPointer

.end

with the following linker script:

ENTRY(start);
 
. = 0x80000000;
 
SECTIONS {
    .text : ALIGN(4K) {
        *(.init);
        *(.text);
    }
    .bss : ALIGN(4K) {
        *(.bss);
        PROVIDE(globalPointer = .);
    }
    .rodata : ALIGN(4K) {
        *(.rodata);
    }
    .data : ALIGN(4K) {
        *(.data);
    }
}

Assembled and linked with the following commands:

riscv64-elf-as -march=rv64gc source/entry.s -o build/entry.o
riscv64-elf-ld -nostdlib -melf64lriscv -T linker.ld build/entry.o -o out/bootloader.elf

With a toolchain made of up the following tools with --target=riscv64-elf as a configuration parameter and following the other flags here at OsDev.

binutils: 2.37
gcc: 11.2.0

I have also tried this prebuilt toolchain from kernel.org.

I was also able to trigger the same error in a C file with the following code:

#include <stdint.h>

extern volatile uint64_t* globalPointer;

int kernalMain(void){
    *globalPointer = 0;
    return 0;
}

So my issue is not isolated to assembly code.

Upvotes: 3

Views: 1361

Answers (1)

gudenau
gudenau

Reputation: 530

So I figured out my problem!

I missed a . in a symbol name.

Upvotes: 1

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