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From aca2758cff1f8fdc5ad7b6076ef985ba9ec5f857 Mon Sep 17 00:00:00 2001
From: David Holsgrove <david.holsgrove@xilinx.com>
Date: Mon, 4 Feb 2013 12:15:22 +1000
Subject: [PATCH 14/16] [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: David Holsgrove <david.holsgrove@xilinx.com>
Upstream-Status: Pending
---
bfd/bfd-in2.h | 5 +++++
bfd/elf32-microblaze.c | 45 +++++++++++++++++++++++++++++++++++++--------
bfd/libbfd.h | 1 +
bfd/reloc.c | 6 ++++++
include/elf/microblaze.h | 1 +
5 files changed, 50 insertions(+), 8 deletions(-)
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 8b7f2ee..de38907 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -5449,6 +5449,11 @@ 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 f90df47..a3f89b9 100644
--- a/bfd/elf32-microblaze.c
+++ b/bfd/elf32-microblaze.c
@@ -177,6 +177,20 @@ static reloc_howto_type microblaze_elf_howto_raw[] =
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? */
+
HOWTO (R_MICROBLAZE_64_NONE, /* Type. */
0, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
@@ -532,7 +546,10 @@ microblaze_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
case BFD_RELOC_NONE:
microblaze_reloc = R_MICROBLAZE_NONE;
break;
- case BFD_RELOC_MICROBLAZE_64_NONE:
+ 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;
case BFD_RELOC_32:
@@ -1913,14 +1930,22 @@ 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,
@@ -1968,12 +1993,16 @@ 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)
{
@@ -1998,15 +2027,15 @@ 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);
@@ -2066,7 +2095,7 @@ 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 09f307f..840c662 100644
--- a/bfd/libbfd.h
+++ b/bfd/libbfd.h
@@ -2644,6 +2644,7 @@ 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 7f46c58..5bcd52d 100644
--- a/bfd/reloc.c
+++ b/bfd/reloc.c
@@ -6396,6 +6396,12 @@ 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/include/elf/microblaze.h b/include/elf/microblaze.h
index effca20..f8420dc 100644
--- a/include/elf/microblaze.h
+++ b/include/elf/microblaze.h
@@ -58,6 +58,7 @@ START_RELOC_NUMBERS (elf_microblaze_reloc_type)
RELOC_NUMBER (R_MICROBLAZE_TLSDTPREL64, 27) /* TLS Offset Within TLS Block */
RELOC_NUMBER (R_MICROBLAZE_TLSGOTTPREL32, 28) /* TLS Offset From Thread Pointer */
RELOC_NUMBER (R_MICROBLAZE_TLSTPREL32, 29) /* TLS Offset From Thread Pointer */
+ RELOC_NUMBER (R_MICROBLAZE_32_NONE, 30)
END_RELOC_NUMBERS (R_MICROBLAZE_max)
--
1.9.0
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