414 lines
15 KiB
Diff
414 lines
15 KiB
Diff
From a86ce43d41f2b4453d1137939f25c7b2c68215ee Mon Sep 17 00:00:00 2001
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From: mengqinggang <mengqinggang@loongson.cn>
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Date: Wed, 22 May 2024 14:27:08 +0800
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Subject: [PATCH 088/123] LoongArch: Fix relaxation overflow caused by ld -z
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separate-code
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ld -z separate-code let .text and .rodata in two different but read only
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segment. If the symbol and pc in two segment, the offset from pc to
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symbol need to consider segment alignment.
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Add a function 'loongarch_two_sections_in_same_segment' to determine
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whether two sections are in the same segment.
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---
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bfd/elfnn-loongarch.c | 101 +++++++++++-------
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.../ld-loongarch-elf/relax-medium-call-1.d | 51 ++++++---
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.../ld-loongarch-elf/relax-medium-call-1.s | 6 +-
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.../ld-loongarch-elf/relax-medium-call.d | 51 ++++++---
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.../ld-loongarch-elf/relax-medium-call.s | 6 +-
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.../relax-separate-code-overflow.s | 21 ++++
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ld/testsuite/ld-loongarch-elf/relax.exp | 15 +++
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7 files changed, 176 insertions(+), 75 deletions(-)
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create mode 100644 ld/testsuite/ld-loongarch-elf/relax-separate-code-overflow.s
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diff --git a/bfd/elfnn-loongarch.c b/bfd/elfnn-loongarch.c
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index 47fd08cd..eb572a77 100644
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--- a/bfd/elfnn-loongarch.c
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+++ b/bfd/elfnn-loongarch.c
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@@ -3948,6 +3948,12 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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info->callbacks->reloc_overflow
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(info, h ? &h->root : NULL, name, howto->name, rel->r_addend,
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input_bfd, input_section, rel->r_offset);
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+ if (r_type == R_LARCH_PCREL20_S2
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+ || r_type == R_LARCH_TLS_LD_PCREL20_S2
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+ || r_type == R_LARCH_TLS_GD_PCREL20_S2
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+ || r_type == R_LARCH_TLS_DESC_PCREL20_S2)
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+ _bfd_error_handler (_("recompile with 'gcc -mno-relax' or"
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+ " 'as -mno-relax' or 'ld --no-relax'"));
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break;
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case bfd_reloc_outofrange:
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@@ -4312,6 +4318,30 @@ loongarch_relax_tls_le (bfd *abfd, asection *sec,
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return true;
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}
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+/* Whether two sections in the same segment. */
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+static bool
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+loongarch_two_sections_in_same_segment (bfd *abfd, asection *a, asection *b)
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+{
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+ struct elf_segment_map *m;
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+ for (m = elf_seg_map (abfd); m != NULL; m = m->next)
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+ {
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+ int i;
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+ int j = 0;
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+ for (i = m->count - 1; i >= 0; i--)
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+ {
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+ if (m->sections[i] == a)
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+ j++;
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+ if (m->sections[i] == b)
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+ j++;
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+ }
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+ if (1 == j)
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+ return false;
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+ if (2 == j)
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+ return true;
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+ }
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+ return false;
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+}
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+
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/* Relax pcalau12i,addi.d => pcaddi. */
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static bool
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loongarch_relax_pcala_addi (bfd *abfd, asection *sec, asection *sym_sec,
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@@ -4332,23 +4362,17 @@ loongarch_relax_pcala_addi (bfd *abfd, asection *sec, asection *sym_sec,
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sec->output_offset = sec->output_section->size;
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bfd_vma pc = sec_addr (sec) + rel_hi->r_offset;
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- /* If pc and symbol not in the same segment, add/sub segment alignment.
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- FIXME: if there are multiple readonly segments? How to determine if
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- two sections are in the same segment. */
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- if (!(sym_sec->flags & SEC_READONLY))
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- {
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- max_alignment = info->maxpagesize > max_alignment ? info->maxpagesize
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- : max_alignment;
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- if (symval > pc)
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- pc -= max_alignment;
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- else if (symval < pc)
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- pc += max_alignment;
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- }
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- else
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- if (symval > pc)
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- pc -= max_alignment;
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- else if (symval < pc)
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- pc += max_alignment;
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+ /* If pc and symbol not in the same segment, add/sub segment alignment. */
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+ if (!loongarch_two_sections_in_same_segment (info->output_bfd,
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+ sec->output_section,
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+ sym_sec->output_section))
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+ max_alignment = info->maxpagesize > max_alignment ? info->maxpagesize
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+ : max_alignment;
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+
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+ if (symval > pc)
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+ pc -= (max_alignment > 4 ? max_alignment : 0);
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+ else if (symval < pc)
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+ pc += (max_alignment > 4 ? max_alignment : 0);
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const uint32_t addi_d = 0x02c00000;
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const uint32_t pcaddi = 0x18000000;
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@@ -4387,7 +4411,7 @@ loongarch_relax_pcala_addi (bfd *abfd, asection *sec, asection *sym_sec,
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/* call36 f -> bl f
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tail36 $t0, f -> b f. */
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static bool
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-loongarch_relax_call36 (bfd *abfd, asection *sec,
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+loongarch_relax_call36 (bfd *abfd, asection *sec, asection *sym_sec,
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Elf_Internal_Rela *rel, bfd_vma symval,
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struct bfd_link_info *info, bool *again,
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bfd_vma max_alignment)
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@@ -4403,9 +4427,13 @@ loongarch_relax_call36 (bfd *abfd, asection *sec,
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sec->output_offset = sec->output_section->size;
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bfd_vma pc = sec_addr (sec) + rel->r_offset;
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- /* If pc and symbol not in the same segment, add/sub segment alignment.
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- FIXME: if there are multiple readonly segments? How to determine if
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- two sections are in the same segment. */
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+ /* If pc and symbol not in the same segment, add/sub segment alignment. */
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+ if (!loongarch_two_sections_in_same_segment (info->output_bfd,
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+ sec->output_section,
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+ sym_sec->output_section))
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+ max_alignment = info->maxpagesize > max_alignment ? info->maxpagesize
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+ : max_alignment;
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+
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if (symval > pc)
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pc -= (max_alignment > 4 ? max_alignment : 0);
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else if (symval < pc)
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@@ -4559,22 +4587,17 @@ loongarch_relax_tls_ld_gd_desc (bfd *abfd, asection *sec, asection *sym_sec,
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sec->output_offset = sec->output_section->size;
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bfd_vma pc = sec_addr (sec) + rel_hi->r_offset;
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- /* If pc and symbol not in the same segment, add/sub segment alignment.
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- FIXME: if there are multiple readonly segments? */
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- if (!(sym_sec->flags & SEC_READONLY))
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- {
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- max_alignment = info->maxpagesize > max_alignment ? info->maxpagesize
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- : max_alignment;
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- if (symval > pc)
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- pc -= max_alignment;
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- else if (symval < pc)
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- pc += max_alignment;
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- }
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- else
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- if (symval > pc)
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- pc -= max_alignment;
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- else if (symval < pc)
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- pc += max_alignment;
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+ /* If pc and symbol not in the same segment, add/sub segment alignment. */
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+ if (!loongarch_two_sections_in_same_segment (info->output_bfd,
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+ sec->output_section,
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+ sym_sec->output_section))
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+ max_alignment = info->maxpagesize > max_alignment ? info->maxpagesize
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+ : max_alignment;
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+
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+ if (symval > pc)
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+ pc -= (max_alignment > 4 ? max_alignment : 0);
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+ else if (symval < pc)
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+ pc += (max_alignment > 4 ? max_alignment : 0);
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const uint32_t addi_d = 0x02c00000;
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const uint32_t pcaddi = 0x18000000;
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@@ -4858,8 +4881,8 @@ loongarch_elf_relax_section (bfd *abfd, asection *sec,
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break;
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case R_LARCH_CALL36:
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if (0 == info->relax_pass && (i + 2) <= sec->reloc_count)
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- loongarch_relax_call36 (abfd, sec, rel, symval, info, again,
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- max_alignment);
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+ loongarch_relax_call36 (abfd, sec, sym_sec, rel, symval,
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+ info, again, max_alignment);
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break;
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case R_LARCH_TLS_LE_HI20_R:
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diff --git a/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.d b/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.d
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index c8ee9333..96e7bb09 100644
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--- a/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.d
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+++ b/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.d
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@@ -1,21 +1,42 @@
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-#ld: -e0 -Ttext=0x120000000 --section-start=ta=0x118000000 --section-start=tb=0x127fffffc
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-#objdump: -d -j .text
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+#ld: -e0
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+#objdump: -d
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.*:[ ]+file format .*
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Disassembly of section .text:
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-[ ]*0000000120000000 <__bss_start-0x4030>:
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-[ ]+120000000:[ ]+54000200[ ]+bl[ ]+-134217728[ ]+# 118000000 <a>
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-[ ]+120000004:[ ]+1fffc001[ ]+pcaddu18i[ ]+\$ra, -512
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-[ ]+120000008:[ ]+4ffffc21[ ]+jirl[ ]+\$ra, \$ra, -4
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-[ ]+12000000c:[ ]+50000200[ ]+b[ ]+-134217728[ ]+# 11800000c <b>
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-[ ]+120000010:[ ]+1fffc00c[ ]+pcaddu18i[ ]+\$t0, -512
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-[ ]+120000014:[ ]+4ffffd80[ ]+jirl[ ]+\$zero, \$t0, -4
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-[ ]+120000018:[ ]+1e004001[ ]+pcaddu18i[ ]+\$ra, 512
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-[ ]+12000001c:[ ]+4c000421[ ]+jirl[ ]+\$ra, \$ra, 4
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-[ ]+120000020:[ ]+57fffdff[ ]+bl[ ]+134217724[ ]+# 12800001c <c>
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-[ ]+120000024:[ ]+1e00400c[ ]+pcaddu18i[ ]+\$t0, 512
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-[ ]+120000028:[ ]+4c000580[ ]+jirl[ ]+\$zero, \$t0, 4
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-[ ]+12000002c:[ ]+53fffdff[ ]+b[ ]+134217724[ ]+# 128000028 <d>
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+[ ]*0000000120000078 <a>:
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+[ ]+120000078:[ ]+4c000020[ ]+ret
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+[ ]+12000007c:[ ]+4c000020[ ]+ret
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+[ ]+120000080:[ ]+4c000020[ ]+ret
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+[ ]*0000000120000084 <b>:
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+[ ]+120000084:[ ]+4c000020[ ]+ret
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+[ ]+...
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+[ ]+128000078:[ ]+54000200[ ]+bl[ ]+-134217728[ ]+# 120000078 <a>
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+[ ]+12800007c:[ ]+1fffc001[ ]+pcaddu18i[ ]+\$ra, -512
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+[ ]+128000080:[ ]+4ffffc21[ ]+jirl[ ]+\$ra, \$ra, -4
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+[ ]+128000084:[ ]+50000200[ ]+b[ ]+-134217728[ ]+# 120000084 <b>
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+[ ]+128000088:[ ]+1fffc00c[ ]+pcaddu18i[ ]+\$t0, -512
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+[ ]+12800008c:[ ]+4ffffd80[ ]+jirl[ ]+\$zero, \$t0, -4
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+[ ]+128000090:[ ]+1e004001[ ]+pcaddu18i[ ]+\$ra, 512
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+[ ]+128000094:[ ]+4c000021[ ]+jirl[ ]+\$ra, \$ra, 0
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+[ ]+128000098:[ ]+57fff9ff[ ]+bl[ ]+134217720[ ]+# 130000090 <c>
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+[ ]+12800009c:[ ]+1e00400c[ ]+pcaddu18i[ ]+\$t0, 512
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+[ ]+1280000a0:[ ]+4c000180[ ]+jr[ ]+\$t0
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+[ ]+1280000a4:[ ]+53fff9ff[ ]+b[ ]+134217720[ ]+# 13000009c <d>
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+[ ]+...
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+[ ]+130000070:[ ]+4c000020[ ]+ret
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+[ ]+130000074:[ ]+4c000020[ ]+ret
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+[ ]+130000078:[ ]+4c000020[ ]+ret
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+[ ]+13000007c:[ ]+4c000020[ ]+ret
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+[ ]+130000080:[ ]+4c000020[ ]+ret
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+[ ]+130000084:[ ]+4c000020[ ]+ret
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+[ ]+130000088:[ ]+4c000020[ ]+ret
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+[ ]+13000008c:[ ]+4c000020[ ]+ret
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+[ ]*0000000130000090 <c>:
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+[ ]+130000090:[ ]+4c000020[ ]+ret
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+[ ]+130000094:[ ]+4c000020[ ]+ret
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+[ ]+130000098:[ ]+4c000020[ ]+ret
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+[ ]*000000013000009c <d>:
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+[ ]+13000009c:[ ]+4c000020[ ]+ret
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diff --git a/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.s b/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.s
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index 5266fdab..1770ec9f 100644
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--- a/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.s
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+++ b/ld/testsuite/ld-loongarch-elf/relax-medium-call-1.s
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@@ -1,12 +1,12 @@
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-.section "ta", "ax"
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+.text
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a:
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ret
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ret
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ret
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b:
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ret
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+ .fill 0x7fffff0
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-.text
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pcaddu18i $ra, %call36(a) # min offset, can relax
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jirl $ra, $ra, 0
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pcaddu18i $ra, %call36(a) # overflow, not relax
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@@ -25,7 +25,7 @@ b:
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pcaddu18i $t0, %call36(d) # max offset, can relax
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jirl $zero, $t0, 0
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-.section "tb", "ax"
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+ .fill 0x7ffffc8
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ret
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ret
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ret
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diff --git a/ld/testsuite/ld-loongarch-elf/relax-medium-call.d b/ld/testsuite/ld-loongarch-elf/relax-medium-call.d
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index c8ee9333..96e7bb09 100644
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--- a/ld/testsuite/ld-loongarch-elf/relax-medium-call.d
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+++ b/ld/testsuite/ld-loongarch-elf/relax-medium-call.d
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@@ -1,21 +1,42 @@
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-#ld: -e0 -Ttext=0x120000000 --section-start=ta=0x118000000 --section-start=tb=0x127fffffc
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-#objdump: -d -j .text
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+#ld: -e0
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+#objdump: -d
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.*:[ ]+file format .*
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Disassembly of section .text:
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-[ ]*0000000120000000 <__bss_start-0x4030>:
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-[ ]+120000000:[ ]+54000200[ ]+bl[ ]+-134217728[ ]+# 118000000 <a>
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-[ ]+120000004:[ ]+1fffc001[ ]+pcaddu18i[ ]+\$ra, -512
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-[ ]+120000008:[ ]+4ffffc21[ ]+jirl[ ]+\$ra, \$ra, -4
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-[ ]+12000000c:[ ]+50000200[ ]+b[ ]+-134217728[ ]+# 11800000c <b>
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-[ ]+120000010:[ ]+1fffc00c[ ]+pcaddu18i[ ]+\$t0, -512
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-[ ]+120000014:[ ]+4ffffd80[ ]+jirl[ ]+\$zero, \$t0, -4
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-[ ]+120000018:[ ]+1e004001[ ]+pcaddu18i[ ]+\$ra, 512
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-[ ]+12000001c:[ ]+4c000421[ ]+jirl[ ]+\$ra, \$ra, 4
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-[ ]+120000020:[ ]+57fffdff[ ]+bl[ ]+134217724[ ]+# 12800001c <c>
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-[ ]+120000024:[ ]+1e00400c[ ]+pcaddu18i[ ]+\$t0, 512
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-[ ]+120000028:[ ]+4c000580[ ]+jirl[ ]+\$zero, \$t0, 4
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-[ ]+12000002c:[ ]+53fffdff[ ]+b[ ]+134217724[ ]+# 128000028 <d>
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+[ ]*0000000120000078 <a>:
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+[ ]+120000078:[ ]+4c000020[ ]+ret
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+[ ]+12000007c:[ ]+4c000020[ ]+ret
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+[ ]+120000080:[ ]+4c000020[ ]+ret
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+[ ]*0000000120000084 <b>:
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+[ ]+120000084:[ ]+4c000020[ ]+ret
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+[ ]+...
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+[ ]+128000078:[ ]+54000200[ ]+bl[ ]+-134217728[ ]+# 120000078 <a>
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+[ ]+12800007c:[ ]+1fffc001[ ]+pcaddu18i[ ]+\$ra, -512
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+[ ]+128000080:[ ]+4ffffc21[ ]+jirl[ ]+\$ra, \$ra, -4
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+[ ]+128000084:[ ]+50000200[ ]+b[ ]+-134217728[ ]+# 120000084 <b>
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+[ ]+128000088:[ ]+1fffc00c[ ]+pcaddu18i[ ]+\$t0, -512
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+[ ]+12800008c:[ ]+4ffffd80[ ]+jirl[ ]+\$zero, \$t0, -4
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+[ ]+128000090:[ ]+1e004001[ ]+pcaddu18i[ ]+\$ra, 512
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+[ ]+128000094:[ ]+4c000021[ ]+jirl[ ]+\$ra, \$ra, 0
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+[ ]+128000098:[ ]+57fff9ff[ ]+bl[ ]+134217720[ ]+# 130000090 <c>
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+[ ]+12800009c:[ ]+1e00400c[ ]+pcaddu18i[ ]+\$t0, 512
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+[ ]+1280000a0:[ ]+4c000180[ ]+jr[ ]+\$t0
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+[ ]+1280000a4:[ ]+53fff9ff[ ]+b[ ]+134217720[ ]+# 13000009c <d>
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+[ ]+...
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+[ ]+130000070:[ ]+4c000020[ ]+ret
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+[ ]+130000074:[ ]+4c000020[ ]+ret
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+[ ]+130000078:[ ]+4c000020[ ]+ret
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+[ ]+13000007c:[ ]+4c000020[ ]+ret
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+[ ]+130000080:[ ]+4c000020[ ]+ret
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+[ ]+130000084:[ ]+4c000020[ ]+ret
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+[ ]+130000088:[ ]+4c000020[ ]+ret
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+[ ]+13000008c:[ ]+4c000020[ ]+ret
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+[ ]*0000000130000090 <c>:
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+[ ]+130000090:[ ]+4c000020[ ]+ret
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+[ ]+130000094:[ ]+4c000020[ ]+ret
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+[ ]+130000098:[ ]+4c000020[ ]+ret
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+[ ]*000000013000009c <d>:
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+[ ]+13000009c:[ ]+4c000020[ ]+ret
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diff --git a/ld/testsuite/ld-loongarch-elf/relax-medium-call.s b/ld/testsuite/ld-loongarch-elf/relax-medium-call.s
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index c0521b65..7b149620 100644
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--- a/ld/testsuite/ld-loongarch-elf/relax-medium-call.s
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+++ b/ld/testsuite/ld-loongarch-elf/relax-medium-call.s
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@@ -1,12 +1,12 @@
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-.section "ta", "ax"
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+.text
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a:
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ret
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ret
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ret
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b:
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ret
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+ .fill 0x7fffff0
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-.text
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call36 a # min offset, can relax
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call36 a # overflow, not relax
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tail36 $t0, b # min offset, can relax
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@@ -17,7 +17,7 @@ b:
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tail36 $t0, d # overflow, no relax
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tail36 $t0, d # max offset, can relax
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-.section "tb", "ax"
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+ .fill 0x7ffffc8
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ret
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ret
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ret
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diff --git a/ld/testsuite/ld-loongarch-elf/relax-separate-code-overflow.s b/ld/testsuite/ld-loongarch-elf/relax-separate-code-overflow.s
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new file mode 100644
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index 00000000..df5dd5fe
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--- /dev/null
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+++ b/ld/testsuite/ld-loongarch-elf/relax-separate-code-overflow.s
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@@ -0,0 +1,21 @@
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+# ld -z separate-code let .text and .rodata in two segment,
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+# need to consider segment alignment
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+.text
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+ # first two la.local relax in the second trip, and result in the third
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+ # la.local (relax to pcaddi) overflow
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+ la.local $r12, a
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+ la.local $r12, b
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+ .fill 0x3ff8
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+ # relax in the first trip
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+ la.local $r12, c
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+ .fill 0x1fbfec
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+a:
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+ .fill 8
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+b:
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+ .fill 0x1000
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+d:
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+ .fill 0x1
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+
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+.section .rodata
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+c:
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+ .8byte 0x1
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diff --git a/ld/testsuite/ld-loongarch-elf/relax.exp b/ld/testsuite/ld-loongarch-elf/relax.exp
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index c1da9c10..05c4ed0a 100644
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--- a/ld/testsuite/ld-loongarch-elf/relax.exp
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+++ b/ld/testsuite/ld-loongarch-elf/relax.exp
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@@ -308,6 +308,21 @@ if [istarget loongarch64-*-*] {
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"relax-section-align-overflow" \
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] \
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]
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+
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+ # # loongarch*-elf target do not support -z separate-code
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+ if [check_shared_lib_support] {
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+ run_ld_link_tests \
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+ [list \
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+ [list \
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+ "loongarch relax separate code overflow" \
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+ "-e0 -z separate-code" "" \
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+ "" \
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+ {relax-separate-code-overflow.s} \
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+ {} \
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+ "relax-separate-code-overflow" \
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+ ] \
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+ ]
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+ }
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}
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|
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if [check_shared_lib_support] {
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--
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2.33.0
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