1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
From 77c9dd2085e5a9e116cd8d8b4fbc1387c93d26d8 Mon Sep 17 00:00:00 2001
From: Nagaraju Mekala <nmekala@xilix.com>
Date: Mon, 6 Feb 2017 15:53:08 +0530
Subject: [PATCH 06/40] microblaze: 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 <nmekala@xilinx.com>
---
bfd/bfd-in2.h | 5 +++++
bfd/elf32-microblaze.c | 39 +++++++++++++++++++++++++++++++-------
bfd/libbfd.h | 1 +
bfd/reloc.c | 6 ++++++
binutils/readelf.c | 4 ++++
gas/config/tc-microblaze.c | 3 +++
include/elf/microblaze.h | 1 +
7 files changed, 52 insertions(+), 7 deletions(-)
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 35ef4d755bb..3fdbf8ed755 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -5428,6 +5428,11 @@ 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 09dedc46106..1be1ead2f41 100644
--- a/bfd/elf32-microblaze.c
+++ b/bfd/elf32-microblaze.c
@@ -176,6 +176,20 @@ static reloc_howto_type microblaze_elf_howto_raw[] =
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 * 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;
@@ -1914,14 +1931,22 @@ 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,
@@ -1969,12 +1994,16 @@ 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 (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)
{
@@ -2002,14 +2031,10 @@ microblaze_elf_relax_section (bfd *abfd,
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
- + isym->st_value, 0, sec);
+ 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);
@@ -2069,7 +2094,7 @@ 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 b97534fc9fe..c1551b92405 100644
--- a/bfd/libbfd.h
+++ b/bfd/libbfd.h
@@ -2967,6 +2967,7 @@ 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 9aba84ca81e..9b39b419415 100644
--- a/bfd/reloc.c
+++ b/bfd/reloc.c
@@ -6858,6 +6858,12 @@ ENUM
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
diff --git a/binutils/readelf.c b/binutils/readelf.c
index 6057515a89b..04704d22fef 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -13406,6 +13406,10 @@ 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 d01653aeef9..74a63abeb0c 100644
--- a/gas/config/tc-microblaze.c
+++ b/gas/config/tc-microblaze.c
@@ -2198,6 +2198,8 @@ md_apply_fix (fixS * fixP,
moves code around due to relaxing. */
if (fixP->fx_r_type == BFD_RELOC_64_PCREL)
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);
@@ -2422,6 +2424,7 @@ 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 2fec296967b..55f34f72b0d 100644
--- a/include/elf/microblaze.h
+++ b/include/elf/microblaze.h
@@ -61,6 +61,7 @@ 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. */
--
2.17.1
|
