From 4d83e8d97e3b15dcd7b5c58f4199e9f5bd6fca3d Mon Sep 17 00:00:00 2001 From: Christophe Lyon Date: Tue, 2 Jul 2019 13:09:02 +0000 Subject: [PATCH] PR ld/24709 [arm] linker crash and assertion failure with CMSE As discussed in the PR, we do not support the case where CMSE stubs are inserted too far from their destination. This would require an intermediate long-branch stub, which is tricky in this context. Instead of crashing, this patch emit an error message and exits. 2019-07-02 Christophe Lyon * bfd/elf32-arm.c (CMSE_STUB_NAME): New define. (elf32_arm_get_stub_entry): Do not try to emit long-branch stubs for CMSE stubs. (arm_dedicated_stub_output_section_name): Use CMSE_STUB_NAME. Change-Id: I6d4e1c0fdee6bb9f4b07e5e1b46700b5ba31c62e --- bfd/ChangeLog | 7 +++++++ bfd/elf32-arm.c | 25 ++++++++++++++++++++++++- 2 files changed, 31 insertions(+), 1 deletion(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 2d30075..af25e43 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,10 @@ +2019-07-02 Christophe Lyon + + * bfd/elf32-arm.c (CMSE_STUB_NAME): New define. + (elf32_arm_get_stub_entry): Do not try to emit long-branch stubs + for CMSE stubs. + (arm_dedicated_stub_output_section_name): Use CMSE_STUB_NAME. + 2019-07-02 Srinath Parvathaneni * elf32-arm.c (elf32_arm_gc_mark_extra_sections): Mark debug diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c index fc7a41c..6b689769 100644 --- a/bfd/elf32-arm.c +++ b/bfd/elf32-arm.c @@ -2300,6 +2300,8 @@ typedef unsigned short int insn16; #define CMSE_PREFIX "__acle_se_" +#define CMSE_STUB_NAME ".gnu.sgstubs" + /* The name of the dynamic interpreter. This is put in the .interp section. */ #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" @@ -4583,6 +4585,27 @@ elf32_arm_get_stub_entry (const asection *input_section, if ((input_section->flags & SEC_CODE) == 0) return NULL; + /* If the input section is the CMSE stubs one and it needs a long + branch stub to reach it's final destination, give up with an + error message: this is not supported. See PR ld/24709. */ + if (!strncmp (input_section->name, CMSE_STUB_NAME, strlen(CMSE_STUB_NAME))) + { + bfd *output_bfd = htab->obfd; + asection *out_sec = bfd_get_section_by_name (output_bfd, CMSE_STUB_NAME); + + _bfd_error_handler (_("ERROR: CMSE stub (%s section) too far " + "(%#" PRIx64 ") from destination (%#" PRIx64 ")"), + CMSE_STUB_NAME, + (uint64_t)out_sec->output_section->vma + + out_sec->output_offset, + (uint64_t)sym_sec->output_section->vma + + sym_sec->output_offset + + h->root.root.u.def.value); + /* Exit, rather than leave incompletely processed + relocations. */ + xexit(1); + } + /* If this input section is part of a group of sections sharing one stub section, then use the id of the first section in the group. Stub names need to include a section id, as there may well be @@ -4676,7 +4699,7 @@ arm_dedicated_stub_output_section_name (enum elf32_arm_stub_type stub_type) switch (stub_type) { case arm_stub_cmse_branch_thumb_only: - return ".gnu.sgstubs"; + return CMSE_STUB_NAME; default: BFD_ASSERT (!arm_dedicated_stub_output_section_required (stub_type)); -- 2.7.4