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+From 900c0f0aa3d78cd9e67ccd26fbc86224cef4c5b1 Mon Sep 17 00:00:00 2001
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+From: Alan Modra <amodra@gmail.com>
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+Date: Fri, 16 Feb 2024 22:33:29 +1030
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+Subject: [PATCH] PR27597, nios: assertion fail in nios2_elf32_install_imm16
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+
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+The assertion in nios2_elf32_install_imm16 triggers when the PLT is
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+twice the maximum allowable size for a branch from PLTn to reach
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+.PLTresolve, and on no other call to nios2_elf32_install_imm16. That
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+makes the assertion completely useless. We can handle a PIC PLT
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+exceeding 0x8000 in size by bouncing branches that won't reach through
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+previous branches.
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+
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+ PR 27597
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+ * elf32-nios2.c (nios2_elf32_install_imm16): Delete BFD_ASSERT.
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+ (nios2_build_one_stub): Don't bother masking value passed to
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+ nios2_elf32_install_imm16.
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+ (nios2_elf32_finish_dynamic_symbol): Likewise. Handle overflow
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+ of PLTn branch to .PLTresolve by bouncing through prior branches.
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+
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+Upstream: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=900c0f0aa3d78cd9e67ccd26fbc86224cef4c5b1
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+
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+Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
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+---
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+ bfd/elf32-nios2.c | 40 ++++++++++++++++++++++++----------------
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+ 1 file changed, 24 insertions(+), 16 deletions(-)
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+
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+diff --git a/bfd/elf32-nios2.c b/bfd/elf32-nios2.c
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+index bebf4239958..7f61e2f8507 100644
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+--- a/bfd/elf32-nios2.c
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++++ b/bfd/elf32-nios2.c
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+@@ -1878,8 +1878,6 @@ nios2_elf32_install_imm16 (asection *sec, bfd_vma offset, bfd_vma value)
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+ {
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+ bfd_vma word = bfd_get_32 (sec->owner, sec->contents + offset);
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+
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+- BFD_ASSERT (value <= 0xffff || ((bfd_signed_vma) value) >= -0xffff);
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+-
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+ bfd_put_32 (sec->owner, word | ((value & 0xffff) << 6),
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+ sec->contents + offset);
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+ }
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+@@ -2518,7 +2516,7 @@ nios2_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_U
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+ nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset,
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+ hiadj (sym_value));
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+ nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset + 4,
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+- (sym_value & 0xffff));
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++ sym_value);
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+ stub_sec->size += 12;
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+ break;
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+ default:
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+@@ -4986,16 +4984,28 @@ nios2_elf32_finish_dynamic_symbol (bfd *output_bfd,
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+ /* Emit the PLT entry. */
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+ if (bfd_link_pic (info))
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+ {
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++ bfd_vma br_offset;
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++
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+ nios2_elf32_install_data (splt, nios2_so_plt_entry, h->plt.offset,
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+ 3);
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+ plt_index = (h->plt.offset - 24) / 12;
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+ got_offset = (plt_index + 3) * 4;
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+ nios2_elf32_install_imm16 (splt, h->plt.offset,
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+- hiadj(plt_index * 4));
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++ hiadj (plt_index * 4));
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+ nios2_elf32_install_imm16 (splt, h->plt.offset + 4,
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+- (plt_index * 4) & 0xffff);
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+- nios2_elf32_install_imm16 (splt, h->plt.offset + 8,
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+- 0xfff4 - h->plt.offset);
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++ plt_index * 4);
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++ br_offset = -(h->plt.offset + 12);
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++ /* If this plt entry is too far away from the start of .plt
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++ for the "br" to reach .PLTresolve, bounce through one or
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++ more of the previous "br" instructions. */
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++ if (br_offset < (bfd_vma) -32768)
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++ {
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++ br_offset += 32768 / 12 * 12 - 4;
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++ while (br_offset < (bfd_vma) -32768)
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++ br_offset += 32768 / 12 * 12;
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++ }
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++ nios2_elf32_install_imm16 (splt, h->plt.offset + 8, br_offset);
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++
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+ got_address = (sgotplt->output_section->vma + sgotplt->output_offset
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+ + got_offset);
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+
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+@@ -5014,9 +5024,8 @@ nios2_elf32_finish_dynamic_symbol (bfd *output_bfd,
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+ nios2_elf32_install_data (splt, nios2_plt_entry, h->plt.offset, 3);
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+ got_address = (sgotplt->output_section->vma + sgotplt->output_offset
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+ + got_offset);
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+- nios2_elf32_install_imm16 (splt, h->plt.offset, hiadj(got_address));
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+- nios2_elf32_install_imm16 (splt, h->plt.offset + 4,
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+- got_address & 0xffff);
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++ nios2_elf32_install_imm16 (splt, h->plt.offset, hiadj (got_address));
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++ nios2_elf32_install_imm16 (splt, h->plt.offset + 4, got_address);
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+
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+ /* Fill in the entry in the global offset table. */
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+ bfd_put_32 (output_bfd,
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+@@ -5217,8 +5226,8 @@ nios2_elf32_finish_dynamic_sections (bfd *output_bfd,
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+ BFD_ASSERT ((got_pcrel & 0xf) == 0);
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+ nios2_elf32_install_data (splt, nios2_so_plt0_entry, 0, 6);
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+ nios2_elf32_install_imm16 (splt, 4, hiadj (got_pcrel));
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+- nios2_elf32_install_imm16 (splt, 12, got_pcrel & 0xffff);
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+- nios2_elf32_install_imm16 (splt, 16, (got_pcrel + 4) & 0xffff);
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++ nios2_elf32_install_imm16 (splt, 12, got_pcrel);
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++ nios2_elf32_install_imm16 (splt, 16, got_pcrel + 4);
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+ }
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+ else
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+ {
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+@@ -5240,14 +5249,13 @@ nios2_elf32_finish_dynamic_sections (bfd *output_bfd,
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+
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+ nios2_elf32_install_data (splt, nios2_plt0_entry, res_size, 7);
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+ nios2_elf32_install_imm16 (splt, res_size, hiadj (res_start));
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+- nios2_elf32_install_imm16 (splt, res_size + 4,
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+- res_start & 0xffff);
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++ nios2_elf32_install_imm16 (splt, res_size + 4, res_start);
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+ nios2_elf32_install_imm16 (splt, res_size + 12,
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+ hiadj (got_address));
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+ nios2_elf32_install_imm16 (splt, res_size + 16,
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+- (got_address + 4) & 0xffff);
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++ got_address + 4);
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+ nios2_elf32_install_imm16 (splt, res_size + 20,
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+- (got_address + 8) & 0xffff);
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++ got_address + 8);
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+ }
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+ }
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+ }
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+--
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+2.34.1
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+
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Giulio Benetti