From 8772de117d8366988bc60c9f9c571e262ef75932 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Mon, 19 Feb 2018 18:38:41 +0000 Subject: [PATCH] LD: Support fixed-size sections some psABIs may require Define a SEC_FIXED_SIZE section flag for target backends to use for output sections whose size has been fixed in the psABI. The size of such sections will not be changed anyhow by the generic linker and it is up to the target backend to get their size right. bfd/ * section.c (SEC_FIXED_SIZE): New macro. * bfd-in2.h: Regenerate. ld/ * ldlang.c (insert_pad): Do not change output section's size if SEC_FIXED_SIZE is set in the flags. (size_input_section): Likewise. (lang_size_sections_1): Likewise. (lang_reset_memory_regions): Likewise. --- bfd/ChangeLog | 5 +++++ bfd/bfd-in2.h | 5 +++++ bfd/section.c | 5 +++++ ld/ChangeLog | 8 ++++++++ ld/ldlang.c | 30 ++++++++++++++++++++---------- 5 files changed, 43 insertions(+), 10 deletions(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index e4c33c76d55..b84a3d15972 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,8 @@ +2018-02-19 Maciej W. Rozycki + + * section.c (SEC_FIXED_SIZE): New macro. + * bfd-in2.h: Regenerate. + 2018-02-19 Maciej W. Rozycki * section.c (SEC_HAS_GOT_REF): Remove macro. diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h index 2901488ef1d..9742c1ac7fe 100644 --- a/bfd/bfd-in2.h +++ b/bfd/bfd-in2.h @@ -1342,6 +1342,11 @@ typedef struct bfd_section /* The section contains thread local data. */ #define SEC_THREAD_LOCAL 0x400 + /* The section's size is fixed. Generic linker code will not + recalculate it and it is up to whoever has set this flag to + get the size right. */ +#define SEC_FIXED_SIZE 0x800 + /* The section contains common symbols (symbols may be defined multiple times, the value of a symbol is the amount of space it requires, and the largest symbol value is the one diff --git a/bfd/section.c b/bfd/section.c index de4ca3ad9e8..6aa18d5db3c 100644 --- a/bfd/section.c +++ b/bfd/section.c @@ -221,6 +221,11 @@ CODE_FRAGMENT . {* The section contains thread local data. *} .#define SEC_THREAD_LOCAL 0x400 . +. {* The section's size is fixed. Generic linker code will not +. recalculate it and it is up to whoever has set this flag to +. get the size right. *} +.#define SEC_FIXED_SIZE 0x800 +. . {* The section contains common symbols (symbols may be defined . multiple times, the value of a symbol is the amount of . space it requires, and the largest symbol value is the one diff --git a/ld/ChangeLog b/ld/ChangeLog index 84c6d3e9dd5..4f5cd5fe001 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,11 @@ +2018-02-19 Maciej W. Rozycki + + * ldlang.c (insert_pad): Do not change output section's size if + SEC_FIXED_SIZE is set in the flags. + (size_input_section): Likewise. + (lang_size_sections_1): Likewise. + (lang_reset_memory_regions): Likewise. + 2018-02-19 Alan Modra * ldmisc.c (vfinfo) Handle %pI, %pR, %pS and %pT in place of diff --git a/ld/ldlang.c b/ld/ldlang.c index 1a6f2cf6c1f..54019826f60 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -4675,8 +4675,9 @@ insert_pad (lang_statement_union_type **ptr, } pad->padding_statement.output_offset = dot - output_section->vma; pad->padding_statement.size = alignment_needed; - output_section->size = TO_SIZE (dot + TO_ADDR (alignment_needed) - - output_section->vma); + if (!(output_section->flags & SEC_FIXED_SIZE)) + output_section->size = TO_SIZE (dot + TO_ADDR (alignment_needed) + - output_section->vma); } /* Work out how much this section will move the dot point. */ @@ -4725,7 +4726,8 @@ size_input_section /* Mark how big the output section must be to contain this now. */ dot += TO_ADDR (i->size); - o->size = TO_SIZE (dot - o->vma); + if (!(o->flags & SEC_FIXED_SIZE)) + o->size = TO_SIZE (dot - o->vma); } return dot; @@ -5079,7 +5081,8 @@ lang_size_sections_1 bfd_set_section_vma (os->bfd_section->owner, os->bfd_section, bfd_section_vma (input->owner, input)); - os->bfd_section->size = input->size; + if (!(os->bfd_section->flags & SEC_FIXED_SIZE)) + os->bfd_section->size = input->size; break; } @@ -5194,7 +5197,9 @@ lang_size_sections_1 + os->block_value - 1) & - (bfd_vma) os->block_value); - os->bfd_section->size = TO_SIZE (after - os->bfd_section->vma); + if (!(os->bfd_section->flags & SEC_FIXED_SIZE)) + os->bfd_section->size = TO_SIZE (after + - os->bfd_section->vma); } /* Set section lma. */ @@ -5379,8 +5384,10 @@ lang_size_sections_1 if (size < TO_SIZE ((unsigned) 1)) size = TO_SIZE ((unsigned) 1); dot += TO_ADDR (size); - output_section_statement->bfd_section->size - = TO_SIZE (dot - output_section_statement->bfd_section->vma); + if (!(output_section_statement->bfd_section->flags + & SEC_FIXED_SIZE)) + output_section_statement->bfd_section->size + = TO_SIZE (dot - output_section_statement->bfd_section->vma); } break; @@ -5395,8 +5402,10 @@ lang_size_sections_1 output_section_statement->bfd_section; size = bfd_get_reloc_size (s->reloc_statement.howto); dot += TO_ADDR (size); - output_section_statement->bfd_section->size - = TO_SIZE (dot - output_section_statement->bfd_section->vma); + if (!(output_section_statement->bfd_section->flags + & SEC_FIXED_SIZE)) + output_section_statement->bfd_section->size + = TO_SIZE (dot - output_section_statement->bfd_section->vma); } break; @@ -6764,7 +6773,8 @@ lang_reset_memory_regions (void) { /* Save the last size for possible use by bfd_relax_section. */ o->rawsize = o->size; - o->size = 0; + if (!(o->flags & SEC_FIXED_SIZE)) + o->size = 0; } } -- 2.30.2