[PATCH v1] LoongArch: Use less DW_LNS_fixed_advance_pc
mengqinggang
mengqinggang@loongson.cn
Wed Aug 26 06:38:53 GMT 2026
Gentle ping.
在 2026/8/19 11:41, mengqinggang 写道:
> If DWARF2_USE_FIXED_ADVANCE_PC is nonzero, use the DW_LNS_fixed_advance_pc
> opcode; otherwise, use special opcodes.
>
> Add FROM symbol and TO symbol parameters for finer-grained control.
>
> Use special opcodes when no linker-relaxable instructions between two symbols;
> otherwise, use DW_LNS_fixed_advance_pc opcodes.
>
> Add a new macro DWARF2_USE_FIXED_ADVANCE_PC_FRAG to avoid unnecessary calls
> to symbol_get_value_expression on other targets.
> ---
> Changes in V1 (based on Alan's feedback):
> - Delete the first DWARF2_USE_FIXED_ADVANCE_PC and always call
> resolve_symbol_value with finalize_syms zero in dwarf2dbg_convert_frag.
> - Add a new macro DWARF2_USE_FIXED_ADVANCE_PC_FRAG to avoid unnecessary
> calls to symbol_get_value_expression on other targets.
>
> gas/config/tc-h8300.h | 2 +-
> gas/config/tc-loongarch.c | 25 ++++++++++
> gas/config/tc-loongarch.h | 10 +++-
> gas/config/tc-msp430.h | 2 +-
> gas/config/tc-nds32.h | 2 +-
> gas/config/tc-riscv.h | 2 +-
> gas/config/tc-rl78.h | 2 +-
> gas/config/tc-xtensa.h | 2 +-
> gas/dwarf2dbg.c | 49 ++++++++++---------
> gas/testsuite/gas/elf/dwarf-5-irp.d | 3 +-
> gas/testsuite/gas/elf/dwarf-5-loc0.d | 3 +-
> gas/testsuite/gas/elf/dwarf-5-macro-include.d | 2 +-
> gas/testsuite/gas/elf/dwarf-5-macro.d | 2 +-
> gas/testsuite/gas/elf/dwarf2-11.d | 3 +-
> gas/testsuite/gas/elf/dwarf2-15.d | 3 +-
> gas/testsuite/gas/elf/dwarf2-16.d | 3 +-
> gas/testsuite/gas/elf/dwarf2-17.d | 3 +-
> gas/testsuite/gas/elf/dwarf2-18.d | 3 +-
> gas/testsuite/gas/elf/dwarf2-19.d | 3 +-
> gas/testsuite/gas/elf/dwarf2-5.d | 3 +-
> gas/testsuite/gas/lns/lns.exp | 1 -
> .../relax-debug-line-opcode-norelax.d | 10 ++++
> .../gas/loongarch/relax-debug-line-opcode.d | 25 ++++++++++
> .../gas/loongarch/relax-debug-line-opcode.s | 15 ++++++
> 24 files changed, 125 insertions(+), 53 deletions(-)
> create mode 100644 gas/testsuite/gas/loongarch/relax-debug-line-opcode-norelax.d
> create mode 100644 gas/testsuite/gas/loongarch/relax-debug-line-opcode.d
> create mode 100644 gas/testsuite/gas/loongarch/relax-debug-line-opcode.s
>
> diff --git a/gas/config/tc-h8300.h b/gas/config/tc-h8300.h
> index c4689d37b12..66664553a24 100644
> --- a/gas/config/tc-h8300.h
> +++ b/gas/config/tc-h8300.h
> @@ -46,7 +46,7 @@ struct internal_reloc;
>
> /* Minimum instruction is of 16 bits. */
> #define DWARF2_LINE_MIN_INSN_LENGTH 2
> -#define DWARF2_USE_FIXED_ADVANCE_PC 0
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) 0
>
> /* Provide mappings from the original H8 COFF relocation names to
> their corresponding BFD relocation names. */
> diff --git a/gas/config/tc-loongarch.c b/gas/config/tc-loongarch.c
> index bd7d8dabb7a..e02881761fe 100644
> --- a/gas/config/tc-loongarch.c
> +++ b/gas/config/tc-loongarch.c
> @@ -1644,6 +1644,31 @@ _loongarch_force_relocation_sub_same (segT sec,
> return true;
> }
>
> +/* Use DW_LNS_fixed_advance_pc with relocations if there are linker-relaxable
> + instructions between from and to symbols. Otherwise, use special opcodes
> + without relocations. */
> +bool
> +loongarch_fixed_advance_pc (symbolS *from, symbolS *to)
> +{
> + segT fromsec = S_GET_SEGMENT (from);
> + segT tosec = S_GET_SEGMENT (to);
> + if (fromsec != tosec)
> + return false;
> + fragS *fromfrag = symbol_get_frag (from);
> + fragS *tofrag = symbol_get_frag (to);
> + return _loongarch_force_relocation_sub_same (fromsec, fromfrag, tofrag);
> +}
> +
> +/* Similar to loongarch_fixed_advance_pc, used for frag. */
> +bool
> +loongarch_fixed_advance_pc_frag (fragS *frag)
> +{
> + expressionS *exp = symbol_get_value_expression (frag->fr_symbol);
> +
> + if (exp->X_op != O_subtract)
> + return false;
> + return loongarch_fixed_advance_pc (exp->X_op_symbol, exp->X_add_symbol);
> +}
>
> /* Postpone text-section label subtraction calculation until linking,
> since linker relaxations might change the deltas. */
> diff --git a/gas/config/tc-loongarch.h b/gas/config/tc-loongarch.h
> index 146844e772e..1f11f9cef46 100644
> --- a/gas/config/tc-loongarch.h
> +++ b/gas/config/tc-loongarch.h
> @@ -101,8 +101,14 @@ extern bool loongarch_force_relocation_sub_same(struct fix *, asection *);
> #define MD_APPLY_SYM_VALUE(FIX) 0
>
> #define TARGET_USE_CFIPOP 1
> -/* Adjust debug_line after relaxation. */
> -#define DWARF2_USE_FIXED_ADVANCE_PC 1
> +
> +extern bool loongarch_fixed_advance_pc (symbolS *, symbolS *);
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) \
> + loongarch_fixed_advance_pc (FROM, TO)
> +
> +extern bool loongarch_fixed_advance_pc_frag (fragS *);
> +#define DWARF2_USE_FIXED_ADVANCE_PC_FRAG(FRAG) \
> + loongarch_fixed_advance_pc_frag (FRAG)
>
> /* FDE Data Alignment Factor.
> FDE Code Alignment Factor (DWARF2_LINE_MIN_INSN_LENGTH) should be 1
> diff --git a/gas/config/tc-msp430.h b/gas/config/tc-msp430.h
> index fe202abc713..f9b6c1e588c 100644
> --- a/gas/config/tc-msp430.h
> +++ b/gas/config/tc-msp430.h
> @@ -168,7 +168,7 @@ extern bool msp430_allow_local_subtract (expressionS *, expressionS *, segT);
> so don't report errors at this point. */
> #define TC_VALIDATE_FIX_SUB(FIX, SEG) 1
>
> -#define DWARF2_USE_FIXED_ADVANCE_PC 1
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) 1
>
> #define TC_LINKRELAX_FIXUP(seg) ((seg->flags & SEC_CODE) || (seg->flags & SEC_DEBUGGING))
>
> diff --git a/gas/config/tc-nds32.h b/gas/config/tc-nds32.h
> index 432d46d9fb1..49a1bead095 100644
> --- a/gas/config/tc-nds32.h
> +++ b/gas/config/tc-nds32.h
> @@ -77,7 +77,7 @@ extern bool nds32_allow_local_subtract (expressionS *, expressionS *, segT);
> #define md_allow_local_subtract(lhs,rhs,sect) nds32_allow_local_subtract (lhs, rhs, sect)
>
> /* dwarf2dbg.c. */
> -#define DWARF2_USE_FIXED_ADVANCE_PC 1
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) 1
>
> /* write.c. */
> extern long nds32_pcrel_from_section (struct fix *, segT);
> diff --git a/gas/config/tc-riscv.h b/gas/config/tc-riscv.h
> index d695db83477..7518d2a70f7 100644
> --- a/gas/config/tc-riscv.h
> +++ b/gas/config/tc-riscv.h
> @@ -135,7 +135,7 @@ extern void riscv_elf_section_change_hook (void);
> extern void riscv_elf_final_processing (void);
>
> /* Adjust debug_line after relaxation. */
> -#define DWARF2_USE_FIXED_ADVANCE_PC 1
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) 1
>
> #define md_parse_name(name, exp, mode, c) \
> riscv_parse_name (name, exp, mode)
> diff --git a/gas/config/tc-rl78.h b/gas/config/tc-rl78.h
> index 9761d509aa1..fb54a2e8da7 100644
> --- a/gas/config/tc-rl78.h
> +++ b/gas/config/tc-rl78.h
> @@ -94,6 +94,6 @@ extern void rl78_elf_final_processing (void);
> || ((SEC)->flags & SEC_DEBUGGING) != 0 \
> || TC_FORCE_RELOCATION (FIX))
>
> -#define DWARF2_USE_FIXED_ADVANCE_PC 1
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) 1
>
> #define TC_FORCE_RELOCATION(FIX) (linkrelax)
> diff --git a/gas/config/tc-xtensa.h b/gas/config/tc-xtensa.h
> index 64d735144d7..d6ddac738fe 100644
> --- a/gas/config/tc-xtensa.h
> +++ b/gas/config/tc-xtensa.h
> @@ -419,7 +419,7 @@ extern void xtensa_init (int, char **);
> #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
>
> /* Use line number format that is amenable to linker relaxation. */
> -#define DWARF2_USE_FIXED_ADVANCE_PC (linkrelax != 0)
> +#define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) (linkrelax != 0)
>
>
> /* Resource reservation info functions. */
> diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c
> index a1ceab4e428..c899eecd26b 100644
> --- a/gas/dwarf2dbg.c
> +++ b/gas/dwarf2dbg.c
> @@ -112,7 +112,13 @@
> opcodes and variable-length operands cannot be used. If this macro is
> nonzero, use the DW_LNS_fixed_advance_pc opcode instead. */
> #ifndef DWARF2_USE_FIXED_ADVANCE_PC
> -# define DWARF2_USE_FIXED_ADVANCE_PC linkrelax
> +# define DWARF2_USE_FIXED_ADVANCE_PC(FROM, TO) linkrelax
> +#endif
> +
> +/* Similar to DWARF2_USE_FIXED_ADVANCE_PC, used for frag. */
> +#ifndef DWARF2_USE_FIXED_ADVANCE_PC_FRAG
> +# define DWARF2_USE_FIXED_ADVANCE_PC_FRAG(FRAG) \
> + DWARF2_USE_FIXED_ADVANCE_PC (0, 0)
> #endif
>
> /* First special line opcode - leave room for the standard opcodes.
> @@ -1898,7 +1904,7 @@ relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym)
>
> /* The maximum size of the frag is the line delta with a maximum
> sized address delta. */
> - if (DWARF2_USE_FIXED_ADVANCE_PC)
> + if (DWARF2_USE_FIXED_ADVANCE_PC (from_sym, to_sym))
> max_chars = size_fixed_inc_line_addr (line_delta,
> -DWARF2_LINE_MIN_INSN_LENGTH);
> else
> @@ -1919,7 +1925,7 @@ dwarf2dbg_estimate_size_before_relax (fragS *frag)
> int size;
>
> addr_delta = resolve_symbol_value (frag->fr_symbol);
> - if (DWARF2_USE_FIXED_ADVANCE_PC)
> + if (DWARF2_USE_FIXED_ADVANCE_PC_FRAG (frag))
> size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta);
> else
> size = size_inc_line_addr (frag->fr_offset, addr_delta);
> @@ -1953,31 +1959,25 @@ dwarf2dbg_convert_frag (fragS *frag)
> {
> offsetT addr_diff;
>
> - if (DWARF2_USE_FIXED_ADVANCE_PC)
> - {
> - /* If linker relaxation is enabled then the distance between the two
> - symbols in the frag->fr_symbol expression might change. Hence we
> - cannot rely upon the value computed by resolve_symbol_value.
> - Instead we leave the expression unfinalized and allow
> - emit_fixed_inc_line_addr to create a fixup (which later becomes a
> - relocation) that will allow the linker to correctly compute the
> - actual address difference. We have to use a fixed line advance for
> - this as we cannot (easily) relocate leb128 encoded values. */
> - int saved_finalize_syms = finalize_syms;
> -
> - finalize_syms = 0;
> - addr_diff = resolve_symbol_value (frag->fr_symbol);
> - finalize_syms = saved_finalize_syms;
> - }
> - else
> - addr_diff = resolve_symbol_value (frag->fr_symbol);
> + /* If linker relaxation is enabled then the distance between the two
> + symbols in the frag->fr_symbol expression might change. Hence we
> + cannot rely upon the value computed by resolve_symbol_value.
> + Instead we leave the expression unfinalized and allow
> + emit_fixed_inc_line_addr to create a fixup (which later becomes a
> + relocation) that will allow the linker to correctly compute the
> + actual address difference. We have to use a fixed line advance for
> + this as we cannot (easily) relocate leb128 encoded values. */
> + int saved_finalize_syms = finalize_syms;
> + finalize_syms = 0;
> + addr_diff = resolve_symbol_value (frag->fr_symbol);
> + finalize_syms = saved_finalize_syms;
>
> /* fr_var carries the max_chars that we created the fragment with.
> fr_subtype carries the current expected length. We must, of
> course, have allocated enough memory earlier. */
> gas_assert (frag->fr_var >= (int) frag->fr_subtype);
>
> - if (DWARF2_USE_FIXED_ADVANCE_PC)
> + if (DWARF2_USE_FIXED_ADVANCE_PC_FRAG (frag))
> emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag,
> frag->fr_literal + frag->fr_fix,
> frag->fr_subtype);
> @@ -2110,7 +2110,8 @@ process_entries (segT seg, struct line_entry *e)
> out_set_addr (lab);
> out_inc_line_addr (line_delta, 0);
> }
> - else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC)
> + else if (frag == last_frag
> + && ! DWARF2_USE_FIXED_ADVANCE_PC (last_lab, lab))
> out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs);
> else
> relax_inc_line_addr (line_delta, lab, last_lab);
> @@ -2127,7 +2128,7 @@ process_entries (segT seg, struct line_entry *e)
> /* Emit a DW_LNE_end_sequence for the end of the section. */
> frag = last_frag_for_seg (seg);
> frag_ofs = get_frag_fix (frag, seg);
> - if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC)
> + if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC (last_lab, lab))
> out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs);
> else
> {
> diff --git a/gas/testsuite/gas/elf/dwarf-5-irp.d b/gas/testsuite/gas/elf/dwarf-5-irp.d
> index a4f01355db3..781b2a32aaa 100644
> --- a/gas/testsuite/gas/elf/dwarf-5-irp.d
> +++ b/gas/testsuite/gas/elf/dwarf-5-irp.d
> @@ -5,8 +5,7 @@
> # The bfin target does not allow .subsection with an equated symbol as operand.
> # The d30v target emits sufficiently different debug info, apparently also covering padding it inserts.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am33*-* bfin-* cr16-* crx-* d30v-* ft32-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am33*-* bfin-* cr16-* crx-* d30v-* ft32-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Raw dump of debug contents .*
> #...
> diff --git a/gas/testsuite/gas/elf/dwarf-5-loc0.d b/gas/testsuite/gas/elf/dwarf-5-loc0.d
> index 9338271c0eb..9439d103b1f 100644
> --- a/gas/testsuite/gas/elf/dwarf-5-loc0.d
> +++ b/gas/testsuite/gas/elf/dwarf-5-loc0.d
> @@ -3,8 +3,7 @@
> #name: DWARF5 .loc 0
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Contents of the \.debug_line section:
>
> diff --git a/gas/testsuite/gas/elf/dwarf-5-macro-include.d b/gas/testsuite/gas/elf/dwarf-5-macro-include.d
> index c39425aa8c9..32ea6386992 100644
> --- a/gas/testsuite/gas/elf/dwarf-5-macro-include.d
> +++ b/gas/testsuite/gas/elf/dwarf-5-macro-include.d
> @@ -4,7 +4,7 @@
> # The am33 cr16 crx ft32 mn10* msp430 nds32* and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The d30v target emits sufficiently different debug info, apparently also covering padding it inserts.
> # The riscv targets do not support the subtraction of symbols.
> -#xfail: am33*-* cr16-* crx-* d30v-* ft32-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am33*-* cr16-* crx-* d30v-* ft32-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Raw dump of debug contents .*
> #...
> diff --git a/gas/testsuite/gas/elf/dwarf-5-macro.d b/gas/testsuite/gas/elf/dwarf-5-macro.d
> index b2613bd1c16..794e17a575e 100644
> --- a/gas/testsuite/gas/elf/dwarf-5-macro.d
> +++ b/gas/testsuite/gas/elf/dwarf-5-macro.d
> @@ -4,7 +4,7 @@
> # The am33 cr16 crx ft32 mn10* msp430 nds32* and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The d30v target emits sufficiently different debug info, apparently also covering padding it inserts.
> # The riscv targets do not support the subtraction of symbols.
> -#xfail: am33*-* cr16-* crx-* d30v-* ft32-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am33*-* cr16-* crx-* d30v-* ft32-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Raw dump of debug contents .*
> #...
> diff --git a/gas/testsuite/gas/elf/dwarf2-11.d b/gas/testsuite/gas/elf/dwarf2-11.d
> index 44f5cd18ec6..2c30e55c695 100644
> --- a/gas/testsuite/gas/elf/dwarf2-11.d
> +++ b/gas/testsuite/gas/elf/dwarf2-11.d
> @@ -3,8 +3,7 @@
> #name: DWARF2 11
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Contents of the \.debug_line section:
>
> diff --git a/gas/testsuite/gas/elf/dwarf2-15.d b/gas/testsuite/gas/elf/dwarf2-15.d
> index 3ec9f2785a7..939c61598cb 100644
> --- a/gas/testsuite/gas/elf/dwarf2-15.d
> +++ b/gas/testsuite/gas/elf/dwarf2-15.d
> @@ -3,8 +3,7 @@
> #name: DWARF2 15
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Hex dump of section '\.rodata':
> 0x00000000 01 *.*
> diff --git a/gas/testsuite/gas/elf/dwarf2-16.d b/gas/testsuite/gas/elf/dwarf2-16.d
> index 32b57763137..8e35d493619 100644
> --- a/gas/testsuite/gas/elf/dwarf2-16.d
> +++ b/gas/testsuite/gas/elf/dwarf2-16.d
> @@ -4,8 +4,7 @@
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The mep target tries to relay code sections which breaks symbolic view computations.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* mep-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mep-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Hex dump of section '\.rodata':
> 0x00000000 01 *.*
> diff --git a/gas/testsuite/gas/elf/dwarf2-17.d b/gas/testsuite/gas/elf/dwarf2-17.d
> index 4c2f2e3999e..881477cf95b 100644
> --- a/gas/testsuite/gas/elf/dwarf2-17.d
> +++ b/gas/testsuite/gas/elf/dwarf2-17.d
> @@ -4,8 +4,7 @@
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The mep target tries to relay code sections which breaks symbolic view computations.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* loongarch*-* mep-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mep-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Hex dump of section '\.rodata':
> 0x00000000 00 *.*
> diff --git a/gas/testsuite/gas/elf/dwarf2-18.d b/gas/testsuite/gas/elf/dwarf2-18.d
> index 18157c634a5..fbaebaa9019 100644
> --- a/gas/testsuite/gas/elf/dwarf2-18.d
> +++ b/gas/testsuite/gas/elf/dwarf2-18.d
> @@ -3,8 +3,7 @@
> #name: DWARF2 18
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Hex dump of section '\.rodata':
> 0x00000000 0100 *.*
> diff --git a/gas/testsuite/gas/elf/dwarf2-19.d b/gas/testsuite/gas/elf/dwarf2-19.d
> index 133294affe7..55d0caf4cb1 100644
> --- a/gas/testsuite/gas/elf/dwarf2-19.d
> +++ b/gas/testsuite/gas/elf/dwarf2-19.d
> @@ -4,8 +4,7 @@
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The mep targets turns some view computations into complex relocations.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* mep-* loongarch*-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mep-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Hex dump of section '\.rodata':
> 0x00000000 01000102 *.*
> diff --git a/gas/testsuite/gas/elf/dwarf2-5.d b/gas/testsuite/gas/elf/dwarf2-5.d
> index 1dd65732c50..bf1eeb5bbfd 100644
> --- a/gas/testsuite/gas/elf/dwarf2-5.d
> +++ b/gas/testsuite/gas/elf/dwarf2-5.d
> @@ -4,8 +4,7 @@
> # The am33 cr16 crx ft32 mn10 msp430 nds32 and rl78 targets do not evaluate the subtraction of symbols at assembly time.
> # The mep target tries to relay code sections which breaks symbolic view computations.
> # The riscv targets do not support the subtraction of symbols.
> -# The loongarch targets do not support the subtraction of symbols.
> -#xfail: am3*-* cr16-* crx-* ft32*-* loongarch*-* mep-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
> +#xfail: am3*-* cr16-* crx-* ft32*-* mep-* mn10*-* msp430-* nds32*-* riscv*-* rl78-*
>
> Hex dump of section '\.rodata':
> 0x00000000 01010201 010203 *.*
> diff --git a/gas/testsuite/gas/lns/lns.exp b/gas/testsuite/gas/lns/lns.exp
> index 7a92c54a260..58c2235b628 100644
> --- a/gas/testsuite/gas/lns/lns.exp
> +++ b/gas/testsuite/gas/lns/lns.exp
> @@ -31,7 +31,6 @@ if { ![istarget s390*-*-*] } {
> || [istarget cr16-*-*]
> || [istarget crx-*-*]
> || [istarget ft32*-*]
> - || [istarget loongarch*-*-*]
> || [istarget mn10*-*-*]
> || [istarget msp430-*-*]
> || [istarget nds32*-*-*]
> diff --git a/gas/testsuite/gas/loongarch/relax-debug-line-opcode-norelax.d b/gas/testsuite/gas/loongarch/relax-debug-line-opcode-norelax.d
> new file mode 100644
> index 00000000000..c8be41feb82
> --- /dev/null
> +++ b/gas/testsuite/gas/loongarch/relax-debug-line-opcode-norelax.d
> @@ -0,0 +1,10 @@
> +#source: relax-debug-line-opcode.s
> +#as: -mno-relax
> +#readelf: -W -wl
> +
> +#...
> +.* Special opcode 62: advance Address by 4 to 0x4 and Line by 1 to 11
> +.* Special opcode 118: advance Address by 8 to 0xc and Line by 1 to 12
> +.* Special opcode 62: advance Address by 4 to 0x10 and Line by 1 to 13
> +.* Special opcode 118: advance Address by 8 to 0x18 and Line by 1 to 14
> +#pass
> diff --git a/gas/testsuite/gas/loongarch/relax-debug-line-opcode.d b/gas/testsuite/gas/loongarch/relax-debug-line-opcode.d
> new file mode 100644
> index 00000000000..9c707d97747
> --- /dev/null
> +++ b/gas/testsuite/gas/loongarch/relax-debug-line-opcode.d
> @@ -0,0 +1,25 @@
> +#source: relax-debug-line-opcode.s
> +#as: -mrelax
> +#readelf: -r -wl -W
> +
> +#...
> +Relocation section '\.rela\.debug_line' at offset .* contains 7 entries:
> +#...
> +.*R_LARCH_ADD16[ ]+[0-9]+.*
> +.*R_LARCH_SUB16[ ]+[0-9]+.*
> +.*R_LARCH_ADD16[ ]+[0-9]+.*
> +.*R_LARCH_SUB16[ ]+[0-9]+.*
> +#...
> +Raw dump of debug contents of section \.debug_line:
> +#...
> +.* Special opcode 62: advance Address by 4 to 0x4 and Line by 1 to 11
> +.* Advance Line by 1 to 12
> +.* Advance PC by fixed size amount [0-9]+ to 0x[0-9a-f]+
> +.* Copy .*
> +.* Special opcode 62: advance Address by 4 to 0x10 and Line by 1 to 13
> +.* Advance Line by 1 to 14
> +.* Advance PC by fixed size amount [0-9]+ to 0x[0-9a-f]+
> +.* Copy .*
> +.* Advance PC by [0-9]+ to 0x[0-9a-f]+
> +.* Extended opcode 1: End of Sequence
> +#pass
> diff --git a/gas/testsuite/gas/loongarch/relax-debug-line-opcode.s b/gas/testsuite/gas/loongarch/relax-debug-line-opcode.s
> new file mode 100644
> index 00000000000..276a823373c
> --- /dev/null
> +++ b/gas/testsuite/gas/loongarch/relax-debug-line-opcode.s
> @@ -0,0 +1,15 @@
> + # Test DWARF line encoding around linker-relaxable instructions.
> + .file 0 "test"
> + .text
> + .loc 0 10 0
> + nop # special opcode
> + .loc 0 11 0
> + call36 func # -mrelax: DW_LNS_fixed_advance_pc; -mno-relax: special opcode.
> + .loc 0 12 0
> + nop # special opcode
> + .loc 0 13 0
> + call36 func # -mrelax: DW_LNS_fixed_advance_pc; -mno-relax: special opcode.
> + .loc 0 14 0
> + nop # Advance PC
> +
> +.section .debug_line, "", @progbits
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