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AArch64: Implement choice between Cortex-A53 erratum workarounds. (PR ld/24373)

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The Cortex-A53 erratum currently has two ways it can resolve the erratum when
using the flag --fix-cortex-a53-843419:

1) If the address is within the range of an ADR instruction it rewrites the ADRP
   into an ADR, and those doesn't need the use of a veneer.

2) If the address is not within range, it adds a branch to a veneer which will
   execute the final bit of the erratum workaround and branch back to the call
   site.

When we do this we always generate the veneers and we always align the size of
the text section to 4KB.  This is because we only know which workaround we can
use after all linking has finished and all addresses are known.  This means even
though the veneers are not used, we still generate the section and we still
change the size of the input section.

This is problematic for small memory devices as this would require the user to
take about a ~4KB hit in memory even though it's not even used.

Since there's no real way to restart the linking process from the final write
phase this patch solves the issue by allowing the user more control over which
erratum workaround gets used.

Concretely this changes the option --fix-cortex-a53-843419 to take optional
arguments --fix-cortex-a53-843419[=full|adr|adrp]

- full (default): Use both ADRP and ADR workaround. This is equivalent to not
		  specifying any options and is the default behavior before this
		  patch.

- adr: Only use the ADR workaround, this will not cause any increase in binary
       size but linking will fail if the referenced address is out of range of
       an ADR instruction.

- adrp: Use only the ADRP workaround, this will never rewrite your ADRP.

In the cases where the user knows how big their binaries are the `adr` option
would prevent the unneeded overhead.

bfd/ChangeLog:

	PR ld/24373
	* bfd-in.h (enum erratum_84319_opts): New
	(bfd_elf64_aarch64_set_options, bfd_elf32_aarch64_set_options): Change
	int to enum erratum_84319_opts.
	* bfd-in2.h: Regenerate.
	* elfnn-aarch64.c (struct elf_aarch64_link_hash_table): Change
	fix_erratum_843419 to use new enum, remove fix_erratum_843419_adr.
	(_bfd_aarch64_add_stub_entry_after): Conditionally create erratum stub.
	(aarch64_size_one_stub): Conditionally size erratum 843419 stubs.
	(_bfd_aarch64_resize_stubs): Amend comment.
	(elfNN_aarch64_size_stubs): Don't generate stubs when no workaround
	requested.
	(bfd_elfNN_aarch64_set_options): Use new fix_erratum_843419 enum.
	(_bfd_aarch64_erratum_843419_branch_to_stub): Implement selection of
	erratum workaround.
	(clear_erratum_843419_entry): Update erratum conditional.

ld/ChangeLog:

	PR ld/24373
	* emultempl/aarch64elf.em (PARSE_AND_LIST_LONGOPTS): Add optional args
	to flags.
	* NEWS: Add changes to flag.
	(PARSE_AND_LIST_OPTIONS): Update help descriptions.
	(PARSE_AND_LIST_ARGS_CASES): Add new options to parser.
	* testsuite/ld-aarch64/aarch64-elf.exp: Add new run_dump_tests.
	* testsuite/ld-aarch64/erratum843419-adr.d: New test.
	* testsuite/ld-aarch64/erratum843419-adrp.d: New test.
	* testsuite/ld-aarch64/erratum843419-far-adr.d: New test.
	* testsuite/ld-aarch64/erratum843419-far-full.d: New test.
	* testsuite/ld-aarch64/erratum843419-far.s: New test.
	* testsuite/ld-aarch64/erratum843419-full.d: New test.
	* testsuite/ld-aarch64/erratum843419-near.s: New test.
	* testsuite/ld-aarch64/erratum843419-no-args.d: New test.
This commit is contained in:
Tamar Christina 2019-05-21 13:04:08 +01:00
parent fab7c86ea4
commit 739b5c9c77
16 changed files with 273 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
bfd/ChangeLog
View File

@ -1,3 +1,22 @@
2019-05-21 Tamar Christina <tamar.christina@arm.com>
PR ld/24373
* bfd-in.h (enum erratum_84319_opts): New
(bfd_elf64_aarch64_set_options, bfd_elf32_aarch64_set_options): Change
int to enum erratum_84319_opts.
* bfd-in2.h: Regenerate.
* elfnn-aarch64.c (struct elf_aarch64_link_hash_table): Change
fix_erratum_843419 to use new enum, remove fix_erratum_843419_adr.
(_bfd_aarch64_add_stub_entry_after): Conditionally create erratum stub.
(aarch64_size_one_stub): Conditionally size erratum 843419 stubs.
(_bfd_aarch64_resize_stubs): Amend comment.
(elfNN_aarch64_size_stubs): Don't generate stubs when no workaround
requested.
(bfd_elfNN_aarch64_set_options): Use new fix_erratum_843419 enum.
(_bfd_aarch64_erratum_843419_branch_to_stub): Implement selection of
erratum workaround.
(clear_erratum_843419_entry): Update erratum conditional.
2019-05-21 Senthil Kumar Selvaraj <senthilkumar.selvaraj@microchip.com>
PR ld/24571

13
bfd/bfd-in.h
View File

@ -1027,12 +1027,21 @@ typedef struct
aarch64_enable_bti_type bti_type;
} aarch64_bti_pac_info;
/* An enum to define what kind of erratum fixes we should apply. This gives the
user a bit more control over the sequences we generate. */
typedef enum
{
ERRAT_NONE = (1 << 0), /* No erratum workarounds allowed. */
ERRAT_ADR = (1 << 1), /* Erratum workarounds using ADR allowed. */
ERRAT_ADRP = (1 << 2), /* Erratum workarounds using ADRP are allowed. */
} erratum_84319_opts;
extern void bfd_elf64_aarch64_set_options
(bfd *, struct bfd_link_info *, int, int, int, int, int, int,
(bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int,
aarch64_bti_pac_info);
extern void bfd_elf32_aarch64_set_options
(bfd *, struct bfd_link_info *, int, int, int, int, int, int,
(bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int,
aarch64_bti_pac_info);
/* ELF AArch64 mapping symbol support. */

13
bfd/bfd-in2.h
View File

@ -1034,12 +1034,21 @@ typedef struct
aarch64_enable_bti_type bti_type;
} aarch64_bti_pac_info;
/* An enum to define what kind of erratum fixes we should apply. This gives the
user a bit more control over the sequences we generate. */
typedef enum
{
ERRAT_NONE = (1 << 0), /* No erratum workarounds allowed. */
ERRAT_ADR = (1 << 1), /* Erratum workarounds using ADR allowed. */
ERRAT_ADRP = (1 << 2), /* Erratum workarounds using ADRP are allowed. */
} erratum_84319_opts;
extern void bfd_elf64_aarch64_set_options
(bfd *, struct bfd_link_info *, int, int, int, int, int, int,
(bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int,
aarch64_bti_pac_info);
extern void bfd_elf32_aarch64_set_options
(bfd *, struct bfd_link_info *, int, int, int, int, int, int,
(bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int,
aarch64_bti_pac_info);
/* ELF AArch64 mapping symbol support. */

73
bfd/elfnn-aarch64.c
View File

@ -2628,10 +2628,7 @@ struct elf_aarch64_link_hash_table
int fix_erratum_835769;
/* Fix erratum 843419. */
int fix_erratum_843419;
/* Enable ADRP->ADR rewrite for erratum 843419 workaround. */
int fix_erratum_843419_adr;
erratum_84319_opts fix_erratum_843419;
/* Don't apply link-time values for dynamic relocations. */
int no_apply_dynamic_relocs;
@ -3229,7 +3226,10 @@ _bfd_aarch64_add_stub_entry_after (const char *stub_name,
asection *stub_sec;
struct elf_aarch64_stub_hash_entry *stub_entry;
stub_sec = _bfd_aarch64_get_stub_for_link_section (link_section, htab);
stub_sec = NULL;
/* Only create the actual stub if we will end up needing it. */
if (htab->fix_erratum_843419 & ERRAT_ADRP)
stub_sec = _bfd_aarch64_get_stub_for_link_section (link_section, htab);
stub_entry = aarch64_stub_hash_lookup (&htab->stub_hash_table, stub_name,
TRUE, FALSE);
if (stub_entry == NULL)
@ -3374,14 +3374,15 @@ aarch64_build_one_stub (struct bfd_hash_entry *gen_entry,
we know stub section sizes. */
static bfd_boolean
aarch64_size_one_stub (struct bfd_hash_entry *gen_entry,
void *in_arg ATTRIBUTE_UNUSED)
aarch64_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
{
struct elf_aarch64_stub_hash_entry *stub_entry;
struct elf_aarch64_link_hash_table *htab;
int size;
/* Massage our args to the form they really have. */
stub_entry = (struct elf_aarch64_stub_hash_entry *) gen_entry;
htab = (struct elf_aarch64_link_hash_table *) in_arg;
switch (stub_entry->stub_type)
{
@ -3395,7 +3396,11 @@ aarch64_size_one_stub (struct bfd_hash_entry *gen_entry,
size = sizeof (aarch64_erratum_835769_stub);
break;
case aarch64_stub_erratum_843419_veneer:
size = sizeof (aarch64_erratum_843419_stub);
{
if (htab->fix_erratum_843419 == ERRAT_ADR)
return TRUE;
size = sizeof (aarch64_erratum_843419_stub);
}
break;
default:
abort ();
@ -4060,8 +4065,10 @@ _bfd_aarch64_resize_stubs (struct elf_aarch64_link_hash_table *htab)
/* Ensure all stub sections have a size which is a multiple of
4096. This is important in order to ensure that the insertion
of stub sections does not in itself move existing code around
in such a way that new errata sequences are created. */
if (htab->fix_erratum_843419)
in such a way that new errata sequences are created. We only do this
when the ADRP workaround is enabled. If only the ADR workaround is
enabled then the stubs workaround won't ever be used. */
if (htab->fix_erratum_843419 & ERRAT_ADRP)
if (section->size)
section->size = BFD_ALIGN (section->size, 0x1000);
}
@ -4284,7 +4291,7 @@ elfNN_aarch64_size_stubs (bfd *output_bfd,
(*htab->layout_sections_again) ();
}
if (htab->fix_erratum_843419)
if (htab->fix_erratum_843419 != ERRAT_NONE)
{
bfd *input_bfd;
@ -4755,7 +4762,7 @@ bfd_elfNN_aarch64_set_options (struct bfd *output_bfd,
int no_enum_warn,
int no_wchar_warn, int pic_veneer,
int fix_erratum_835769,
int fix_erratum_843419,
erratum_84319_opts fix_erratum_843419,
int no_apply_dynamic_relocs,
aarch64_bti_pac_info bp_info)
{
@ -4764,8 +4771,10 @@ bfd_elfNN_aarch64_set_options (struct bfd *output_bfd,
globals = elf_aarch64_hash_table (link_info);
globals->pic_veneer = pic_veneer;
globals->fix_erratum_835769 = fix_erratum_835769;
/* If the default options are used, then ERRAT_ADR will be set by default
which will enable the ADRP->ADR workaround for the erratum 843419
workaround. */
globals->fix_erratum_843419 = fix_erratum_843419;
globals->fix_erratum_843419_adr = TRUE;
globals->no_apply_dynamic_relocs = no_apply_dynamic_relocs;
BFD_ASSERT (is_aarch64_elf (output_bfd));
@ -5235,9 +5244,18 @@ _bfd_aarch64_erratum_843419_branch_to_stub (struct bfd_hash_entry *gen_entry,
|| stub_entry->stub_type != aarch64_stub_erratum_843419_veneer)
return TRUE;
insn = bfd_getl32 (contents + stub_entry->target_value);
bfd_putl32 (insn,
stub_entry->stub_sec->contents + stub_entry->stub_offset);
BFD_ASSERT (((htab->fix_erratum_843419 & ERRAT_ADRP) && stub_entry->stub_sec)
|| (htab->fix_erratum_843419 & ERRAT_ADR));
/* Only update the stub section if we have one. We should always have one if
we're allowed to use the ADRP errata workaround, otherwise it is not
required. */
if (stub_entry->stub_sec)
{
insn = bfd_getl32 (contents + stub_entry->target_value);
bfd_putl32 (insn,
stub_entry->stub_sec->contents + stub_entry->stub_offset);
}
place = (section->output_section->vma + section->output_offset
+ stub_entry->adrp_offset);
@ -5251,14 +5269,16 @@ _bfd_aarch64_erratum_843419_branch_to_stub (struct bfd_hash_entry *gen_entry,
((bfd_vma) _bfd_aarch64_decode_adrp_imm (insn) << 12, 33)
- (place & 0xfff));
if (htab->fix_erratum_843419_adr
if ((htab->fix_erratum_843419 & ERRAT_ADR)
&& (imm >= AARCH64_MIN_ADRP_IMM && imm <= AARCH64_MAX_ADRP_IMM))
{
insn = (_bfd_aarch64_reencode_adr_imm (AARCH64_ADR_OP, imm)
| AARCH64_RT (insn));
bfd_putl32 (insn, contents + stub_entry->adrp_offset);
/* Stub is not needed, don't map it out. */
stub_entry->stub_type = aarch64_stub_none;
}
else
else if (htab->fix_erratum_843419 & ERRAT_ADRP)
{
bfd_vma veneered_insn_loc;
bfd_vma veneer_entry_loc;
@ -5285,6 +5305,21 @@ _bfd_aarch64_erratum_843419_branch_to_stub (struct bfd_hash_entry *gen_entry,
branch_insn |= branch_offset;
bfd_putl32 (branch_insn, contents + stub_entry->target_value);
}
else
{
abfd = stub_entry->target_section->owner;
_bfd_error_handler
(_("%pB: error: erratum 843419 immediate 0x%lx "
"out of range for ADR (input file too large) and "
"--fix-cortex-a53-843419=adr used. Run the linker with "
"--fix-cortex-a53-843419=full instead"), abfd, imm);
bfd_set_error (bfd_error_bad_value);
/* This function is called inside a hashtable traversal and the error
handlers called above turn into non-fatal errors. Which means this
case ld returns an exit code 0 and also produces a broken object file.
To prevent this, issue a hard abort. */
BFD_FAIL ();
}
return TRUE;
}
@ -6154,7 +6189,7 @@ static void
clear_erratum_843419_entry (struct elf_aarch64_link_hash_table *globals,
bfd_vma adrp_offset, asection *input_section)
{
if (globals->fix_erratum_843419)
if (globals->fix_erratum_843419 & ERRAT_ADRP)
{
struct erratum_843419_branch_to_stub_clear_data data;
data.adrp_offset = adrp_offset;

18
ld/ChangeLog
View File

@ -1,3 +1,21 @@
2019-05-21 Tamar Christina <tamar.christina@arm.com>
PR ld/24373
* emultempl/aarch64elf.em (PARSE_AND_LIST_LONGOPTS): Add optional args
to flags.
* NEWS: Add changes to flag.
(PARSE_AND_LIST_OPTIONS): Update help descriptions.
(PARSE_AND_LIST_ARGS_CASES): Add new options to parser.
* testsuite/ld-aarch64/aarch64-elf.exp: Add new run_dump_tests.
* testsuite/ld-aarch64/erratum843419-adr.d: New test.
* testsuite/ld-aarch64/erratum843419-adrp.d: New test.
* testsuite/ld-aarch64/erratum843419-far-adr.d: New test.
* testsuite/ld-aarch64/erratum843419-far-full.d: New test.
* testsuite/ld-aarch64/erratum843419-far.s: New test.
* testsuite/ld-aarch64/erratum843419-full.d: New test.
* testsuite/ld-aarch64/erratum843419-near.s: New test.
* testsuite/ld-aarch64/erratum843419-no-args.d: New test.
2019-05-21 Senthil Kumar Selvaraj <senthilkumar.selvaraj@microchip.com>
PR ld/24571

6
ld/NEWS
View File

@ -2,6 +2,12 @@
* Add command-line option --no-print-map-discarded.
* The Cortex-A53 Erratum 843419 workaround now supports a choice of which
workaround to use. The option --fix-cortex-a53-843419 now takes an
optional argument --fix-cortex-a53-843419[=full|adr|adrp] which can be
used to force a particular workaround to be used. See --help for AArch64
for more details.
Changes in 2.33:
* Add target handlers for AArch64 for ELF GNU program properties.

30
ld/emultempl/aarch64elf.em
View File

@ -31,7 +31,7 @@ static int no_enum_size_warning = 0;
static int no_wchar_size_warning = 0;
static int pic_veneer = 0;
static int fix_erratum_835769 = 0;
static int fix_erratum_843419 = 0;
static erratum_84319_opts fix_erratum_843419 = ERRAT_NONE;
static int no_apply_dynamic_relocs = 0;
static aarch64_plt_type plt_type = PLT_NORMAL;
static aarch64_enable_bti_type bti_type = BTI_NONE;
@ -385,7 +385,7 @@ PARSE_AND_LIST_LONGOPTS='
{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
{ "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
{ "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
{ "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419},
{ "fix-cortex-a53-843419", optional_argument, NULL, OPTION_FIX_ERRATUM_843419},
{ "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
{ "force-bti", no_argument, NULL, OPTION_FORCE_BTI},
{ "pac-plt", no_argument, NULL, OPTION_PAC_PLT},
@ -407,7 +407,17 @@ PARSE_AND_LIST_OPTIONS='
Values of +/-1 indicate the linker should\n\
choose suitable defaults.\n"));
fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n"));
fprintf (file, _("\
--fix-cortex-a53-843419[=full|adr|adrp] Fix erratum 843419 and optionally specify which workaround to use.\n\
full (default): Use both ADRP and ADR workaround, this will \n\
increase the size of your binaries.\n\
adr: Only use the ADR workaround, this will not cause any increase\n\
in binary size but linking will fail if the referenced address is\n\
out of range of an ADR instruction. This will remove the need of using\n\
a veneer and results in both performance and size benefits.\n\
adrp: Use only the ADRP workaround, this will never rewrite your ADRP\n\
instruction into an ADR. As such the workaround will always use a\n\
veneer and this will give you both a performance and size overhead.\n"));
fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n"));
fprintf (file, _(" --force-bti Turn on Branch Target Identification mechanism and generate PLTs with BTI. Generate warnings for missing BTI on inputs\n"));
fprintf (file, _(" --pac-plt Protect PLTs with Pointer Authentication.\n"));
@ -435,7 +445,19 @@ PARSE_AND_LIST_ARGS_CASES='
break;
case OPTION_FIX_ERRATUM_843419:
fix_erratum_843419 = 1;
fix_erratum_843419 = ERRAT_ADR | ERRAT_ADRP;
if (optarg && *optarg)
{
if (strcmp ("full", optarg) == 0)
fix_erratum_843419 = ERRAT_ADR | ERRAT_ADRP;
else if (strcmp ("adrp", optarg) == 0)
fix_erratum_843419 = ERRAT_ADRP;
else if (strcmp ("adr", optarg) == 0)
fix_erratum_843419 = ERRAT_ADR;
else
einfo (_("%P: error: unrecognized option for "
"--fix-cortex-a53-843419: %s\n"), optarg);
}
break;
case OPTION_NO_APPLY_DYNAMIC_RELOCS:

6
ld/testsuite/ld-aarch64/aarch64-elf.exp
View File

@ -87,6 +87,12 @@ run_ld_link_tests eh-frame-merge-lp64
run_dump_test "erratum843419"
run_dump_test "erratum843419_tls_ie"
run_dump_test "erratum843419-adr"
run_dump_test "erratum843419-adrp"
run_dump_test "erratum843419-far-adr"
run_dump_test "erratum843419-far-full"
run_dump_test "erratum843419-full"
run_dump_test "erratum843419-no-args"
# Relocation Tests
run_dump_test_lp64 "weak-undefined"

15
ld/testsuite/ld-aarch64/erratum843419-adr.d Normal file
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@ -0,0 +1,15 @@
#source: erratum843419-near.s
#as:
#ld: -Ttext=0x400000 --fix-cortex-a53-843419=adr
#objdump: -dr
#...
Disassembly of section \.text:
0*400000 <_start>:
...
400ffc: 10038020 adr x0, 408000 <_start\+0x8000>
401000: f9000042 str x2, \[x2\]
401004: d2800002 mov x2, #0x0 // #0
401008: f9402001 ldr x1, \[x0, #64\]
40100c: d503201f nop

22
ld/testsuite/ld-aarch64/erratum843419-adrp.d Normal file
View File

@ -0,0 +1,22 @@
#source: erratum843419-near.s
#as:
#ld: -Ttext=0x400000 --fix-cortex-a53-843419=adrp
#objdump: -dr
#...
Disassembly of section \.text:
0*400000 <_start>:
...
400ffc: 90000040 adrp x0, 408000 <e843419@0002_00000010_1008\+0x6fe8>
401000: f9000042 str x2, \[x2\]
401004: d2800002 mov x2, #0x0 // #0
401008: 14000004 b 401018 <e843419@0002_00000010_1008>
40100c: d503201f nop
401010: 14000400 b 402010 <e843419@0002_00000010_1008\+0xff8>
401014: d503201f nop
0*401018 <e843419@0002_00000010_1008>:
401018: f9402001 ldr x1, \[x0, #64\]
40101c: 17fffffc b 40100c <_start\+0x100c>
...

5
ld/testsuite/ld-aarch64/erratum843419-far-adr.d Normal file
View File

@ -0,0 +1,5 @@
#source: erratum843419-far.s
#as:
#ld: -Ttext=0x400000 --fix-cortex-a53-843419=adr
#error: .*: erratum 843419 immediate 0x7ffff004 out of range for ADR \(input file too large\) and \-\-fix\-cortex\-a53\-843419=adr used\. Run the linker with \-\-fix\-cortex\-a53\-843419=full instead.*
#...

22
ld/testsuite/ld-aarch64/erratum843419-far-full.d Normal file
View File

@ -0,0 +1,22 @@
#source: erratum843419-far.s
#as:
#ld: -Ttext=0x400000 --fix-cortex-a53-843419=full
#objdump: -dr
#...
Disassembly of section \.text:
0*400000 <_start>:
...
400ffc: 90400000 adrp x0, 80400000 <__bss_end__\+0x7ffedff0>
401000: f9000042 str x2, \[x2\]
401004: d2800002 mov x2, #0x0 // #0
401008: 14000004 b 401018 <e843419@0002_00000010_1008>
40100c: d503201f nop
401010: 14000400 b 402010 <e843419@0002_00000010_1008\+0xff8>
401014: d503201f nop
0*401018 <e843419@0002_00000010_1008>:
401018: f9402001 ldr x1, \[x0, #64\]
40101c: 17fffffc b 40100c <_start\+0x100c>
...

9
ld/testsuite/ld-aarch64/erratum843419-far.s Normal file
View File

@ -0,0 +1,9 @@
.balign 0x1000
.globl _start
_start:
.skip 0xffc
adrp x0, _start + 0x80000000
str x2, [x2]
mov x2, #0
ldr x1, [x0, #0x40]
nop

20
ld/testsuite/ld-aarch64/erratum843419-full.d Normal file
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@ -0,0 +1,20 @@
#source: erratum843419-near.s
#as:
#ld: -Ttext=0x400000 --fix-cortex-a53-843419=full
#objdump: -dr
#...
Disassembly of section \.text:
0*400000 <_start>:
...
400ffc: 10038020 adr x0, 408000 <_start\+0x8000>
401000: f9000042 str x2, \[x2\]
401004: d2800002 mov x2, #0x0 // #0
401008: f9402001 ldr x1, \[x0, #64\]
40100c: d503201f nop
401010: 14000400 b 402010 <_start\+0x2010>
401014: d503201f nop
401018: f9402001 ldr x1, \[x0, #64\]
40101c: 17fffffc b 40100c <_start\+0x100c>
...

9
ld/testsuite/ld-aarch64/erratum843419-near.s Normal file
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.balign 0x1000
.globl _start
_start:
.skip 0xffc
adrp x0, _start + 0x8000
str x2, [x2]
mov x2, #0
ldr x1, [x0, #0x40]
nop

20
ld/testsuite/ld-aarch64/erratum843419-no-args.d Normal file
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#source: erratum843419-near.s
#as:
#ld: -Ttext=0x400000 --fix-cortex-a53-843419
#objdump: -dr
#...
Disassembly of section \.text:
0*400000 <_start>:
...
400ffc: 10038020 adr x0, 408000 <_start\+0x8000>
401000: f9000042 str x2, \[x2\]
401004: d2800002 mov x2, #0x0 // #0
401008: f9402001 ldr x1, \[x0, #64\]
40100c: d503201f nop
401010: 14000400 b 402010 <_start\+0x2010>
401014: d503201f nop
401018: f9402001 ldr x1, \[x0, #64\]
40101c: 17fffffc b 40100c <_start\+0x100c>
...