| From 68a91eb7ac94f0e0c6e9ebd7ad148c80cbc227df Mon Sep 17 00:00:00 2001 |
| From: Nagaraju Mekala <nmekala@xilix.com> |
| Date: Mon, 6 Feb 2017 15:53:08 +0530 |
| Subject: [PATCH] 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 <nagaraju.mekala@xilinx.com> |
| |
| --- |
| bfd/bfd-in2.h | 9 ++++++-- |
| bfd/elf32-microblaze.c | 53 ++++++++++++++++++++++++++++++++++------------ |
| bfd/libbfd.h | 1 + |
| bfd/reloc.c | 6 ++++++ |
| binutils/readelf.c | 4 ++++ |
| gas/config/tc-microblaze.c | 5 ++++- |
| include/elf/microblaze.h | 2 ++ |
| 7 files changed, 64 insertions(+), 16 deletions(-) |
| |
| diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h |
| index e251d7e..fe6933a 100644 |
| --- a/bfd/bfd-in2.h |
| +++ b/bfd/bfd-in2.h |
| @@ -5867,10 +5867,15 @@ 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 64 bit reloc that stores the 32 bit pc relative |
| +/* 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_64_NONE, |
| + 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 */ |
| + BFD_RELOC_MICROBLAZE_64_NONE, |
| |
| /* This is a 64 bit reloc that stores the 32 bit pc relative |
| value in two words (with an imm instruction). The relocation is |
| diff --git a/bfd/elf32-microblaze.c b/bfd/elf32-microblaze.c |
| index 359484d..1c69c26 100644 |
| --- a/bfd/elf32-microblaze.c |
| +++ b/bfd/elf32-microblaze.c |
| @@ -176,7 +176,21 @@ static reloc_howto_type microblaze_elf_howto_raw[] = |
| 0x0000ffff, /* Dest Mask. */ |
| FALSE), /* PC relative offset? */ |
| |
| - /* This reloc does nothing. Used for relaxation. */ |
| + 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. */ |
| 3, /* Size (0 = byte, 1 = short, 2 = long). */ |
| @@ -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; |
| @@ -1918,6 +1935,7 @@ 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. */ |
| @@ -1926,12 +1944,18 @@ microblaze_elf_relax_section (bfd *abfd, |
| 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, |
| irel->r_addend); |
| - } |
| - break; |
| + } |
| + break; |
| case R_MICROBLAZE_64_NONE: |
| { |
| /* This was a PC-relative 64-bit instruction that was |
| @@ -1973,12 +1997,16 @@ 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 (1 && 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) |
| { |
| @@ -1999,18 +2027,17 @@ microblaze_elf_relax_section (bfd *abfd, |
| (file_ptr) 0, |
| o->rawsize)) |
| goto error_return; |
| - elf_section_data (o)->this_hdr.contents = ocontents; |
| - } |
| - } |
| - irelscan->r_addend -= calc_fixup (irelscan->r_addend |
| - + isym->st_value, sec); |
| + elf_section_data (o)->this_hdr.contents = ocontents; |
| + } |
| + } |
| val = bfd_get_32 (abfd, ocontents + irelscan->r_offset); |
| + 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, 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); |
| @@ -2070,7 +2097,7 @@ 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 36284d7..feb9fad 100644 |
| --- a/bfd/libbfd.h |
| +++ b/bfd/libbfd.h |
| @@ -2901,6 +2901,7 @@ 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 e6446a7..87753ae 100644 |
| --- a/bfd/reloc.c |
| +++ b/bfd/reloc.c |
| @@ -6796,6 +6796,12 @@ 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 |
| This is a 64 bit reloc that stores the 32 bit pc relative |
| diff --git a/binutils/readelf.c b/binutils/readelf.c |
| index 9df3742..1bbc2d1 100644 |
| --- a/binutils/readelf.c |
| +++ b/binutils/readelf.c |
| @@ -13020,6 +13020,10 @@ is_none_reloc (Filedata * filedata, unsigned int reloc_type) |
| || reloc_type == 32 /* R_AVR_DIFF32. */); |
| case EM_METAG: |
| return reloc_type == 3; /* R_METAG_NONE. */ |
| + case EM_MICROBLAZE: |
| + return reloc_type == 30 /* R_MICROBLAZE_32_NONE. */ |
| + || reloc_type == 0 /* R_MICROBLAZE_NONE. */ |
| + || reloc_type == 9; /* R_MICROBLAZE_64_NONE. */ |
| case EM_NDS32: |
| return (reloc_type == 0 /* R_XTENSA_NONE. */ |
| || reloc_type == 204 /* R_NDS32_DIFF8. */ |
| diff --git a/gas/config/tc-microblaze.c b/gas/config/tc-microblaze.c |
| index 3e72840..fa665b4 100644 |
| --- a/gas/config/tc-microblaze.c |
| +++ b/gas/config/tc-microblaze.c |
| @@ -2201,7 +2201,9 @@ md_apply_fix (fixS * fixP, |
| /* This fixup has been resolved. Create a reloc in case the linker |
| moves code around due to relaxing. */ |
| if (fixP->fx_r_type == BFD_RELOC_64_PCREL) |
| - fixP->fx_r_type = BFD_RELOC_MICROBLAZE_64_NONE; |
| + fixP->fx_r_type = BFD_RELOC_MICROBLAZE_64_NONE; |
| + else if (fixP->fx_r_type == BFD_RELOC_32) |
| + fixP->fx_r_type = BFD_RELOC_MICROBLAZE_32_NONE; |
| else |
| fixP->fx_r_type = BFD_RELOC_NONE; |
| fixP->fx_addsy = section_symbol (absolute_section); |
| @@ -2426,6 +2428,7 @@ tc_gen_reloc (asection * section ATTRIBUTE_UNUSED, fixS * fixp) |
| switch (fixp->fx_r_type) |
| { |
| case BFD_RELOC_NONE: |
| + case BFD_RELOC_MICROBLAZE_32_NONE: |
| case BFD_RELOC_MICROBLAZE_64_NONE: |
| case BFD_RELOC_32: |
| case BFD_RELOC_MICROBLAZE_32_LO: |
| diff --git a/include/elf/microblaze.h b/include/elf/microblaze.h |
| index 830b5ad..6ee0966 100644 |
| --- a/include/elf/microblaze.h |
| +++ b/include/elf/microblaze.h |
| @@ -61,6 +61,8 @@ 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. */ |