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From e98a2f325e1a90dfd6911d124889f0760d663b5c Mon Sep 17 00:00:00 2001
From: Mahesh Bodapati <mbodapat@xilinx.com>
Date: Tue, 8 Nov 2016 11:54:08 +0530
Subject: [PATCH 04/52] [LOCAL]: Fix relaxation of assembler resolved
references,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>
Conflicts:
bfd/elf32-microblaze.c
binutils/readelf.c
include/elf/microblaze.h
---
bfd/bfd-in2.h | 5 ++
bfd/elf32-microblaze.c | 126 ++++++++++++++++++++++++++++---------
bfd/libbfd.h | 1 +
bfd/reloc.c | 6 ++
binutils/readelf.c | 4 ++
gas/config/tc-microblaze.c | 4 ++
include/elf/microblaze.h | 2 +
7 files changed, 119 insertions(+), 29 deletions(-)
Index: gdb-9.2/bfd/bfd-in2.h
===================================================================
--- gdb-9.2.orig/bfd/bfd-in2.h
+++ gdb-9.2/bfd/bfd-in2.h
@@ -5363,6 +5363,11 @@ 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 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 */
Index: gdb-9.2/bfd/elf32-microblaze.c
===================================================================
--- gdb-9.2.orig/bfd/elf32-microblaze.c
+++ gdb-9.2/bfd/elf32-microblaze.c
@@ -177,6 +177,20 @@ static reloc_howto_type microblaze_elf_h
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. */
3, /* Size (0 = byte, 1 = short, 2 = long). */
@@ -562,7 +576,10 @@ microblaze_elf_reloc_type_lookup (bfd *
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:
@@ -1918,18 +1935,26 @@ 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);
- irel->r_addend -= (efix - sfix);
- /* Should use HOWTO. */
- microblaze_bfd_write_imm_value_32 (abfd, contents + irel->r_offset,
- irel->r_addend);
+
+ /* 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;
case R_MICROBLAZE_64_NONE:
@@ -1973,30 +1998,73 @@ 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_32)
- {
- isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
+ 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)
+ {
+ if (elf_section_data (o)->this_hdr.contents != NULL)
+ ocontents = elf_section_data (o)->this_hdr.contents;
+ else
+ {
+ /* We always cache the section contents.
+ Perhaps, if info->keep_memory is FALSE, we
+ should free them, if we are permitted to. */
+
+ if (o->rawsize == 0)
+ o->rawsize = o->size;
+ ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
+ if (ocontents == NULL)
+ goto error_return;
+ if (!bfd_get_section_contents (abfd, o, ocontents,
+ (file_ptr) 0,
+ o->rawsize))
+ goto error_return;
+ elf_section_data (o)->this_hdr.contents = ocontents;
+ }
+ }
- /* Look at the reloc only if the value has been resolved. */
- if (isym->st_shndx == shndx
- && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
- {
- if (ocontents == NULL)
- {
- if (elf_section_data (o)->this_hdr.contents != NULL)
- ocontents = elf_section_data (o)->this_hdr.contents;
- else
- {
- /* We always cache the section contents.
- Perhaps, if info->keep_memory is FALSE, we
- should free them, if we are permitted to. */
- if (o->rawsize == 0)
- o->rawsize = o->size;
- ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
- if (ocontents == NULL)
- goto error_return;
- if (!bfd_get_section_contents (abfd, o, ocontents,
- (file_ptr) 0,
+ 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_32)
+ {
+ isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
+
+ /* Look at the reloc only if the value has been resolved. */
+ if (isym->st_shndx == shndx
+ && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
+ {
+ if (ocontents == NULL)
+ {
+ if (elf_section_data (o)->this_hdr.contents != NULL)
+ ocontents = elf_section_data (o)->this_hdr.contents;
+ else
+ {
+ /* We always cache the section contents.
+ Perhaps, if info->keep_memory is FALSE, we
+ should free them, if we are permitted to. */
+ if (o->rawsize == 0)
+ o->rawsize = o->size;
+ ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
+ if (ocontents == NULL)
+ goto error_return;
+ if (!bfd_get_section_contents (abfd, o, ocontents,
+ (file_ptr) 0,
o->rawsize))
goto error_return;
elf_section_data (o)->this_hdr.contents = ocontents;
@@ -2032,7 +2100,7 @@ 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: gdb-9.2/bfd/libbfd.h
===================================================================
--- gdb-9.2.orig/bfd/libbfd.h
+++ gdb-9.2/bfd/libbfd.h
@@ -2903,6 +2903,7 @@ 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: gdb-9.2/bfd/reloc.c
===================================================================
--- gdb-9.2.orig/bfd/reloc.c
+++ gdb-9.2/bfd/reloc.c
@@ -6807,6 +6807,12 @@ 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: gdb-9.2/include/elf/microblaze.h
===================================================================
--- gdb-9.2.orig/include/elf/microblaze.h
+++ gdb-9.2/include/elf/microblaze.h
@@ -61,6 +61,8 @@ 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. */
|
