https://sourceware.org/bugzilla/show_bug.cgi?id=29557
Bug ID: 29557
Summary: R_RISCV_ALIGN relocation emits wrong padding bytes
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: numbksco at gmail dot com
Target Milestone: ---
Current result:
# cat <<EOF | riscv64-linux-gnu-gcc -fPIC -c -o a.o -xassembler -
.align 2
.section .text.hello
.globl hello
hello:
li a0, 42
ret
EOF
# riscv64-linux-gnu-objdump -z -d --reloc a.o
a.o: file format elf64-littleriscv
Disassembly of section .text:
0000000000000000 <.text>:
0: 0001 nop
0: R_RISCV_ALIGN *ABS*+0x2
2: 0000 unimp
Disassembly of section .text.hello:
0000000000000000 <hello>:
0: 02a00513 li a0,42
4: 8082 ret
According to the spec:
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#relocation-for-alignment
The R_RISCV_ALIGN relocation padding bytes should be `c.nop + c.nop + c.nop` or
`c.nop + nop`, but currently we're getting `c.nop + 0x0000`.
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