[Bug ld/25527] New: [RISC-V] -static-pie not producing relocations

[xerpi.g.12 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25527

            Bug ID: 25527
           Summary: [RISC-V] -static-pie not producing relocations
           Product: binutils
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: xerpi.g.12 at gmail dot com
  Target Milestone: ---

Trying to compile with -static-pie for a bare-metal target: no dynamic linker
and therefore the relocations have to be resolved by the ELF loader when it
establishes a load address or the executable itself at init by iterating over
the relocatable sections.
The problem is that after linking, the output ELF doesn't contain relocations.
Also attached the output when compiling for aarch64.

$ cat simple.c
typedef void (*fptr)(void);

void func1(void) {}
void func2(void) {}

const fptr table[] = {
        func1,
        func2,
};

int _start(int i)
{
        table[i]();
}

$ cat linker.ld
ENTRY(_start)

SECTIONS
{
        . = 0x00001000;
}

---------------------------------------------------------------------------------------------------------------
RISC-V:
- GCC: riscv64-unknown-elf-gcc (GCC) 9.2.0
- binutils: GNU ld (GNU Binutils) 2.32

$ riscv64-unknown-elf-gcc -fPIE -c simple.c -o simple.riscv.o
$ riscv64-unknown-elf-readelf -r simple.riscv.o

Relocation section '.rela.text' at offset 0x278 contains 4 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000050  000b00000017 R_RISCV_PCREL_HI2 0000000000000000 table + 0
000000000050  000000000033 R_RISCV_RELAX                        0
000000000054  000600000018 R_RISCV_PCREL_LO1 0000000000000050 .L0  + 0
000000000054  000000000033 R_RISCV_RELAX                        0

Relocation section '.rela.data.rel.ro.local' at offset 0x2d8 contains 2
entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000000  000900000002 R_RISCV_64        0000000000000000 func1 + 0
000000000008  000a00000002 R_RISCV_64        000000000000001c func2 + 0

$ riscv64-unknown-elf-gcc -nostdlib -nostartfiles -T linker.ld -static-pie
simple.riscv.o -o simple.riscv.elf
$ riscv64-unknown-elf-readelf -r simple.riscv.elf

There are no relocations in this file.

simple.riscv.elf is "Type: EXEC (Executable file)"

---------------------------------------------------------------------------------------------------------------
aarch64:
- GCC: aarch64-linux-gcc.br_real (Buildroot 2018.11-rc2-00003-ga0787e9) 8.2.0
- binutils: GNU ld (GNU Binutils) 2.31.1

$ aarch64-linux-gcc -fPIE -c simple.c -o simple.aarch64.o
$ aarch64-linux-readelf -r simple.aarch64.o 

Relocation section '.rela.text' at offset 0x2d8 contains 2 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
00000000001c  000e00000113 R_AARCH64_ADR_PRE 0000000000000000 table + 0
000000000020  000e00000115 R_AARCH64_ADD_ABS 0000000000000000 table + 0

Relocation section '.rela.data.rel.ro.local' at offset 0x308 contains 2
entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000000  000c00000101 R_AARCH64_ABS64   0000000000000000 func1 + 0
000000000008  000d00000101 R_AARCH64_ABS64   0000000000000008 func2 + 0

Relocation section '.rela.eh_frame' at offset 0x338 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
00000000001c  000200000105 R_AARCH64_PREL32  0000000000000000 .text + 0
000000000030  000200000105 R_AARCH64_PREL32  0000000000000000 .text + 8
000000000044  000200000105 R_AARCH64_PREL32  0000000000000000 .text + 10

$ aarch64-linux-gcc -nostdlib -nostartfiles -T linker.ld -static-pie
simple.aarch64.o -o simple.aarch64.elf
$ aarch64-linux-readelf -r simple.aarch64.elf 

Relocation section '.rela.dyn' at offset 0x1148 contains 2 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000001178  000000000403 R_AARCH64_RELATIV                    1000
000000001180  000000000403 R_AARCH64_RELATIV                    1008

simple.aarch64.elf is "Type: DYN (Shared object file)"

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