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From 9c0639469318b3a88aa7cb5e776eed85b586c5d0 Mon Sep 17 00:00:00 2001
From: Nagaraju Mekala <nmekala@xilix.com>
Date: Mon, 6 Feb 2017 15:53:08 +0530
Subject: [PATCH 05/31] [LOCAL]: 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 f53dbb5..5807f70 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -5790,10 +5790,15 @@ 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 56c82ae..a377790 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 85f61b2..261086c 100644
--- a/bfd/libbfd.h
+++ b/bfd/libbfd.h
@@ -2862,6 +2862,7 @@ 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 68bc8a8..d89bc5d 100644
--- a/bfd/reloc.c
+++ b/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
diff --git a/binutils/readelf.c b/binutils/readelf.c
index 1b50ba7..13e794d 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -12907,6 +12907,10 @@ 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 e3dd1e0..b34796c 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 dbaa16c..7bdba67 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. */
--
2.7.4
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