https://sourceware.org/bugzilla/show_bug.cgi?id=33776
--- Comment #2 from bigmagicreadsun <bigmagicreadsun at gmail dot com> ---
(In reply to Andreas Schwab from comment #1)
> Please provide the assembler input and full command line.
Test Source Code (main.c):
__attribute__((noinline)) int test_frame() {
int local = 0xDEADBEEF;
return local;
}
Compilation Command (Problematic Case):
riscv64-unknown-elf-gcc -O0 -march=rv32imac -mabi=ilp32 -g -Wa,-adhlns=main.lst
-c main.c
Problematic Debug Frame Output:
$ riscv64-unknown-elf-readelf --debug-dump=frames main.o
readelf: Warning: unable to apply unsupported reloc type 56 to section
.debug_frame
Contents of the .debug_frame section:
00000000 0000000c ffffffff CIE
Version: 3
Augmentation: ""
Code alignment factor: 1
Data alignment factor: -4
Return address column: 1
DW_CFA_def_cfa: r2 (sp) ofs 0
00000010 00000024 00000000 FDE cie=00000000 pc=00000000..00000022
DW_CFA_advance_loc: 2 to 00000002
DW_CFA_def_cfa_offset: 26
DW_CFA_advance_loc: 4 to 00000006
DW_CFA_offset: r1 (ra) at cfa-4
DW_CFA_offset: r8 (s0) at cfa-8
DW_CFA_advance_loc: 2 to 00000008
DW_CFA_def_cfa: r8 (s0) ofs 0
DW_CFA_??? (User defined call frame op: 0x36)
Compilation Command (Correct Case):
riscv64-unknown-elf-gcc -O0 -march=rv32imac -mabi=ilp32 -g -c main.c
Correct Debug Frame Output:
$ riscv64-unknown-elf-readelf --debug-dump=frames main.o
Contents of the .debug_frame section:
00000000 0000000c ffffffff CIE
Version: 3
Augmentation: ""
Code alignment factor: 1
Data alignment factor: -4
Return address column: 1
DW_CFA_def_cfa: r2 (sp) ofs 0
00000010 00000024 00000000 FDE cie=00000000 pc=00000000..00000022
DW_CFA_advance_loc: 2 to 00000002
DW_CFA_def_cfa_offset: 32
DW_CFA_advance_loc: 4 to 00000006
DW_CFA_offset: r1 (ra) at cfa-4
DW_CFA_offset: r8 (s0) at cfa-8
DW_CFA_advance_loc: 2 to 00000008
DW_CFA_def_cfa: r8 (s0) ofs 0
DW_CFA_advance_loc: 20 to 0000001c
DW_CFA_restore: r1 (ra)
DW_CFA_advance_loc: 2 to 0000001e
DW_CFA_restore: r8 (s0)
DW_CFA_def_cfa: r2 (sp) ofs 32
DW_CFA_advance_loc: 2 to 00000020
DW_CFA_def_cfa_offset: 0
DW_CFA_nop
DW_CFA_nop
riscv64-unknown-elf-gcc -v
...
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20251215 (experimental) (g03a1951a3)
riscv64-unknown-elf-readelf -v
GNU readelf (GNU Binutils) 2.45.50.20251215
Copyright (C) 2025 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
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