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From 5bf68bc39976903929f730b6eed18686c3563c05 Mon Sep 17 00:00:00 2001
From: Nagaraju Mekala <nagaraju.mekala@xilinx.com>
Date: Mon, 28 Aug 2017 19:53:56 -0700
Subject: [PATCH] Fixup MicroBlaze debug_loc sections after linker relaxation
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.
08/2018
Rebased for binutils 2.31
- Some RELOC_NUMBERs were added upstream, rebased to use 33 instead of 30
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Nagaraju Mekala <nmekala@xilinx.com>
Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha@xilinx.com>
Signed-off-by: Alejandro Enedino Hernandez Samaniego <alejandr@xilinx.com>
Upstream-Status: Pending
---
bfd/bfd-in2.h | 9 +++++++--
bfd/elf32-microblaze.c | 45 ++++++++++++++++++++++++++++++++++++++-------
bfd/libbfd.h | 1 +
bfd/reloc.c | 6 ++++++
binutils/readelf.c | 4 ++++
gas/config/tc-microblaze.c | 5 ++++-
include/elf/microblaze.h | 1 +
7 files changed, 61 insertions(+), 10 deletions(-)
Index: git/bfd/bfd-in2.h
===================================================================
--- git.orig/bfd/bfd-in2.h
+++ git/bfd/bfd-in2.h
@@ -5791,10 +5791,15 @@ value relative to the read-write small d
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
Index: git/bfd/elf32-microblaze.c
===================================================================
--- git.orig/bfd/elf32-microblaze.c
+++ git/bfd/elf32-microblaze.c
@@ -176,6 +176,20 @@ static reloc_howto_type microblaze_elf_h
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 *
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 +1935,23 @@ 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 +1999,16 @@ 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)
{
@@ -2003,15 +2033,16 @@ microblaze_elf_relax_section (bfd *abfd,
}
}
- irelscan->r_addend -= calc_fixup (irelscan->r_addend
- + isym->st_value, sec);
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);
@@ -2071,7 +2102,7 @@ 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);
Index: git/bfd/libbfd.h
===================================================================
--- git.orig/bfd/libbfd.h
+++ git/bfd/libbfd.h
@@ -2862,6 +2862,7 @@ static const char *const bfd_reloc_code_
"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",
Index: git/bfd/reloc.c
===================================================================
--- git.orig/bfd/reloc.c
+++ git/bfd/reloc.c
@@ -6865,6 +6865,12 @@ 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
Index: git/binutils/readelf.c
===================================================================
--- git.orig/binutils/readelf.c
+++ git/binutils/readelf.c
@@ -12908,6 +12908,10 @@ is_none_reloc (Filedata * filedata, unsi
|| reloc_type == 32 /* R_AVR_DIFF32. */);
case EM_METAG:
return reloc_type == 3; /* R_METAG_NONE. */
+ case EM_MICROBLAZE:
+ return reloc_type == 33 /* 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. */
Index: git/gas/config/tc-microblaze.c
===================================================================
--- git.orig/gas/config/tc-microblaze.c
+++ git/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 ATTRIBU
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:
Index: git/include/elf/microblaze.h
===================================================================
--- git.orig/include/elf/microblaze.h
+++ git/include/elf/microblaze.h
@@ -61,6 +61,7 @@ START_RELOC_NUMBERS (elf_microblaze_relo
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. */
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