| From d2aee40b9753b783853bf38d36d9b6e50d16cc20 Mon Sep 17 00:00:00 2001 |
| From: Nagaraju Mekala <nmekala@xilix.com> |
| Date: Mon, 6 Feb 2017 15:53:08 +0530 |
| Subject: [PATCH 06/40] microblaze: Fixup debug_loc sections after linker |
| relaxation |
| |
| Adds a new reloctype R_MICROBLAZE_32_NONE, used for passing |
| reloc info from the assembler to the linker when the linker |
| manages to fully resolve a local symbol reference. |
| |
| This is a workaround for design flaws in the assembler to |
| linker interface with regards to linker relaxation. |
| |
| Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> |
| Signed-off-by: Nagaraju Mekala <nmekala@xilinx.com> |
| --- |
| bfd/bfd-in2.h | 5 +++++ |
| bfd/elf32-microblaze.c | 39 +++++++++++++++++++++++++++++++------- |
| bfd/libbfd.h | 1 + |
| bfd/reloc.c | 6 ++++++ |
| include/elf/microblaze.h | 1 + |
| 7 files changed, 52 insertions(+), 7 deletions(-) |
| |
| diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h |
| index 6f3e41da376..52c81b10b6d 100644 |
| --- a/bfd/bfd-in2.h |
| +++ b/bfd/bfd-in2.h |
| @@ -5363,6 +5363,11 @@ value relative to the read-write small data area anchor */ |
| expressions of the form "Symbol Op Symbol" */ |
| BFD_RELOC_MICROBLAZE_32_SYM_OP_SYM, |
| |
| +/* This is a 32 bit reloc that stores the 32 bit pc relative |
| +value in two words (with an imm instruction). No relocation is |
| +done here - only used for relaxing */ |
| + BFD_RELOC_MICROBLAZE_32_NONE, |
| + |
| /* This is a 64 bit reloc that stores the 32 bit pc relative |
| value in two words (with an imm instruction). No relocation is |
| done here - only used for relaxing */ |
| diff --git a/bfd/elf32-microblaze.c b/bfd/elf32-microblaze.c |
| index dfd82438e35..cbba704e691 100644 |
| --- a/bfd/elf32-microblaze.c |
| +++ b/bfd/elf32-microblaze.c |
| @@ -176,6 +176,20 @@ static reloc_howto_type microblaze_elf_howto_raw[] = |
| 0x0000ffff, /* Dest Mask. */ |
| FALSE), /* PC relative offset? */ |
| |
| + HOWTO (R_MICROBLAZE_32_NONE, /* Type. */ |
| + 0, /* Rightshift. */ |
| + 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| + 32, /* Bitsize. */ |
| + TRUE, /* PC_relative. */ |
| + 0, /* Bitpos. */ |
| + complain_overflow_bitfield, /* Complain on overflow. */ |
| + NULL, /* Special Function. */ |
| + "R_MICROBLAZE_32_NONE",/* Name. */ |
| + FALSE, /* Partial Inplace. */ |
| + 0, /* Source Mask. */ |
| + 0, /* Dest Mask. */ |
| + FALSE), /* PC relative offset? */ |
| + |
| /* This reloc does nothing. Used for relaxation. */ |
| HOWTO (R_MICROBLAZE_64_NONE, /* Type. */ |
| 0, /* Rightshift. */ |
| @@ -562,6 +576,9 @@ microblaze_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, |
| case BFD_RELOC_NONE: |
| microblaze_reloc = R_MICROBLAZE_NONE; |
| break; |
| + case BFD_RELOC_MICROBLAZE_32_NONE: |
| + microblaze_reloc = R_MICROBLAZE_32_NONE; |
| + break; |
| case BFD_RELOC_MICROBLAZE_64_NONE: |
| microblaze_reloc = R_MICROBLAZE_64_NONE; |
| break; |
| @@ -1918,14 +1935,22 @@ microblaze_elf_relax_section (bfd *abfd, |
| } |
| break; |
| case R_MICROBLAZE_NONE: |
| + case R_MICROBLAZE_32_NONE: |
| { |
| /* This was a PC-relative instruction that was |
| completely resolved. */ |
| int sfix, efix; |
| + unsigned int val; |
| bfd_vma target_address; |
| target_address = irel->r_addend + irel->r_offset; |
| sfix = calc_fixup (irel->r_offset, 0, sec); |
| efix = calc_fixup (target_address, 0, sec); |
| + |
| + /* Validate the in-band val. */ |
| + val = bfd_get_32 (abfd, contents + irel->r_offset); |
| + if (val != irel->r_addend && ELF32_R_TYPE (irel->r_info) == R_MICROBLAZE_32_NONE) { |
| + fprintf(stderr, "%d: CORRUPT relax reloc %x %lx\n", __LINE__, val, irel->r_addend); |
| + } |
| irel->r_addend -= (efix - sfix); |
| /* Should use HOWTO. */ |
| microblaze_bfd_write_imm_value_32 (abfd, contents + irel->r_offset, |
| @@ -1973,12 +1998,16 @@ microblaze_elf_relax_section (bfd *abfd, |
| irelscanend = irelocs + o->reloc_count; |
| for (irelscan = irelocs; irelscan < irelscanend; irelscan++) |
| { |
| - if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_NONE) |
| + if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_NONE) |
| { |
| unsigned int val; |
| |
| isym = isymbuf + ELF32_R_SYM (irelscan->r_info); |
| |
| + /* hax: We only do the following fixup for debug location lists. */ |
| + if (strcmp(".debug_loc", o->name)) |
| + continue; |
| + |
| /* This was a PC-relative instruction that was completely resolved. */ |
| if (ocontents == NULL) |
| { |
| @@ -2006,14 +2035,10 @@ microblaze_elf_relax_section (bfd *abfd, |
| if (val != irelscan->r_addend) { |
| fprintf(stderr, "%d: CORRUPT relax reloc! %x %lx\n", __LINE__, val, irelscan->r_addend); |
| } |
| - irelscan->r_addend -= calc_fixup (irelscan->r_addend |
| - + isym->st_value, 0, sec); |
| + irelscan->r_addend -= calc_fixup (irelscan->r_addend, 0, sec); |
| microblaze_bfd_write_imm_value_32 (abfd, ocontents + irelscan->r_offset, |
| irelscan->r_addend); |
| } |
| - if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64_NONE) { |
| - fprintf(stderr, "Unhandled NONE 64\n"); |
| - } |
| if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32) |
| { |
| isym = isymbuf + ELF32_R_SYM (irelscan->r_info); |
| @@ -2073,7 +2098,7 @@ microblaze_elf_relax_section (bfd *abfd, |
| elf_section_data (o)->this_hdr.contents = ocontents; |
| } |
| } |
| - irelscan->r_addend -= calc_fixup (irel->r_addend |
| + irelscan->r_addend -= calc_fixup (irelscan->r_addend |
| + isym->st_value, |
| 0, |
| sec); |
| diff --git a/bfd/libbfd.h b/bfd/libbfd.h |
| index 44cefbd66d4..a01891f3423 100644 |
| --- a/bfd/libbfd.h |
| +++ b/bfd/libbfd.h |
| @@ -2903,6 +2903,7 @@ static const char *const bfd_reloc_code_real_names[] = { "@@uninitialized@@", |
| "BFD_RELOC_MICROBLAZE_32_ROSDA", |
| "BFD_RELOC_MICROBLAZE_32_RWSDA", |
| "BFD_RELOC_MICROBLAZE_32_SYM_OP_SYM", |
| + "BFD_RELOC_MICROBLAZE_32_NONE", |
| "BFD_RELOC_MICROBLAZE_64_NONE", |
| "BFD_RELOC_MICROBLAZE_64_GOTPC", |
| "BFD_RELOC_MICROBLAZE_64_GOT", |
| diff --git a/bfd/reloc.c b/bfd/reloc.c |
| index b00b79f3190..78f13180c71 100644 |
| --- a/bfd/reloc.c |
| +++ b/bfd/reloc.c |
| @@ -6806,6 +6806,12 @@ ENUM |
| ENUMDOC |
| This is a 32 bit reloc for the microblaze to handle |
| expressions of the form "Symbol Op Symbol" |
| +ENUM |
| + BFD_RELOC_MICROBLAZE_32_NONE |
| +ENUMDOC |
| + This is a 32 bit reloc that stores the 32 bit pc relative |
| + value in two words (with an imm instruction). No relocation is |
| + done here - only used for relaxing |
| ENUM |
| BFD_RELOC_MICROBLAZE_64_NONE |
| ENUMDOC |
| diff --git a/include/elf/microblaze.h b/include/elf/microblaze.h |
| index 830b5ad4461..0dba2c0f44f 100644 |
| --- a/include/elf/microblaze.h |
| +++ b/include/elf/microblaze.h |
| @@ -61,6 +61,7 @@ START_RELOC_NUMBERS (elf_microblaze_reloc_type) |
| RELOC_NUMBER (R_MICROBLAZE_TEXTPCREL_64, 30) /* PC-relative TEXT offset. */ |
| RELOC_NUMBER (R_MICROBLAZE_TEXTREL_64, 31) /* TEXT Entry offset 64-bit. */ |
| RELOC_NUMBER (R_MICROBLAZE_TEXTREL_32_LO, 32) /* TEXT Entry offset 32-bit. */ |
| + RELOC_NUMBER (R_MICROBLAZE_32_NONE, 33) |
| END_RELOC_NUMBERS (R_MICROBLAZE_max) |
| |
| /* Global base address names. */ |
| -- |
| 2.17.1 |
| |