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2007-03-20 Paul Brook <paul@codesourcery.com>

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ld/
	* emultempl/armelf.em (pic_veneer): New variable.
	(PARSE_AND_LIST_PROLOGUE): Add OPTION_PIC_VENEER.
	(PARSE_AND_LIST_ARGS_CASES): Ditto.
	(PARSE_AND_LIST_LONGOPTS): Add "pic-veneer".
	(PARSE_AND_LIST_OPTIONS): Ditto.
	* ld.texinfo: Document --pic-veneer.

	ld/testsuite/
	* ld-arm/arm-elf.exp (ld-arm/arm-elf.exp): Add arm-pic-veneer.
	* ld-arm/arm-pic-veneer.d: New test.
	* ld-arm/arm-pic-veneer.s: New test.

	bfd/
	* bfd-in.h (bfd_elf32_arm_set_target_relocs): Update prototype.
	* bfd-in2.h: Regenerate.
	* elf32-arm.c (elf32_arm_link_hash_table): Add pic_veneer.
	(record_arm_to_thumb_glue): Use globals->pic_veneer.
	(elf32_arm_create_thumb_stub): Ditto.
	(bfd_elf32_arm_set_target_relocs): Set globals->pic_veneer.
This commit is contained in:
Paul Brook 2007-03-20 20:19:07 +00:00
parent bf21ed7807
commit 27e55c4d0b
11 changed files with 86 additions and 6 deletions
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9
bfd/ChangeLog
View File

@ -1,3 +1,12 @@
2007-03-20 Paul Brook <paul@codesourcery.com>
* bfd-in.h (bfd_elf32_arm_set_target_relocs): Update prototype.
* bfd-in2.h: Regenerate.
* elf32-arm.c (elf32_arm_link_hash_table): Add pic_veneer.
(record_arm_to_thumb_glue): Use globals->pic_veneer.
(elf32_arm_create_thumb_stub): Ditto.
(bfd_elf32_arm_set_target_relocs): Set globals->pic_veneer.
2007-03-18 Mark Shinwell <shinwell@codesourcery.com>
* bfd-in.h (bfd_elf32_arm_set_target_relocs): Add "bfd *"

2
bfd/bfd-in.h
View File

@ -903,7 +903,7 @@ extern bfd_boolean bfd_elf32_arm_process_before_allocation
void bfd_elf32_arm_set_target_relocs
(bfd *, struct bfd_link_info *, int, char *, int, int, bfd_arm_vfp11_fix,
int);
int, int);
extern bfd_boolean bfd_elf32_arm_get_bfd_for_interworking
(bfd *, struct bfd_link_info *);

2
bfd/bfd-in2.h
View File

@ -910,7 +910,7 @@ extern bfd_boolean bfd_elf32_arm_process_before_allocation
void bfd_elf32_arm_set_target_relocs
(bfd *, struct bfd_link_info *, int, char *, int, int, bfd_arm_vfp11_fix,
int);
int, int);
extern bfd_boolean bfd_elf32_arm_get_bfd_for_interworking
(bfd *, struct bfd_link_info *);

12
bfd/elf32-arm.c
View File

@ -2191,6 +2191,9 @@ struct elf32_arm_link_hash_table
/* Global counter for the number of fixes we have emitted. */
int num_vfp11_fixes;
/* Nonzero to force PIC branch veneers. */
int pic_veneer;
/* The number of bytes in the initial entry in the PLT. */
bfd_size_type plt_header_size;
@ -2714,7 +2717,8 @@ record_arm_to_thumb_glue (struct bfd_link_info * link_info,
free (tmp_name);
if ((link_info->shared || globals->root.is_relocatable_executable))
if (link_info->shared || globals->root.is_relocatable_executable
|| globals->pic_veneer)
size = ARM2THUMB_PIC_GLUE_SIZE;
else
size = ARM2THUMB_STATIC_GLUE_SIZE;
@ -3868,7 +3872,7 @@ bfd_elf32_arm_set_target_relocs (struct bfd *output_bfd,
int fix_v4bx,
int use_blx,
bfd_arm_vfp11_fix vfp11_fix,
int no_enum_warn)
int no_enum_warn, int pic_veneer)
{
struct elf32_arm_link_hash_table *globals;
@ -3889,6 +3893,7 @@ bfd_elf32_arm_set_target_relocs (struct bfd *output_bfd,
globals->fix_v4bx = fix_v4bx;
globals->use_blx |= use_blx;
globals->vfp11_fix = vfp11_fix;
globals->pic_veneer = pic_veneer;
elf32_arm_tdata (output_bfd)->no_enum_size_warning = no_enum_warn;
}
@ -4127,7 +4132,8 @@ elf32_arm_create_thumb_stub (struct bfd_link_info * info,
--my_offset;
myh->root.u.def.value = my_offset;
if ((info->shared || globals->root.is_relocatable_executable))
if (info->shared || globals->root.is_relocatable_executable
|| globals->pic_veneer)
{
/* For relocatable objects we can't use absolute addresses,
so construct the address from a relative offset. */

9
ld/ChangeLog
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@ -1,3 +1,12 @@
2007-03-20 Paul Brook <paul@codesourcery.com>
* emultempl/armelf.em (pic_veneer): New variable.
(PARSE_AND_LIST_PROLOGUE): Add OPTION_PIC_VENEER.
(PARSE_AND_LIST_ARGS_CASES): Ditto.
(PARSE_AND_LIST_LONGOPTS): Add "pic-veneer".
(PARSE_AND_LIST_OPTIONS): Ditto.
* ld.texinfo: Document --pic-veneer.
2007-03-18 Mark Shinwell <shinwell@codesourcery.com>
* ld.texinfo: Document --no-enum-size-warning.

11
ld/emultempl/armelf.em
View File

@ -37,6 +37,7 @@ static int fix_v4bx = 0;
static int use_blx = 0;
static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
static int no_enum_size_warning = 0;
static int pic_veneer = 0;
static void
gld${EMULATION_NAME}_before_parse (void)
@ -241,7 +242,8 @@ arm_elf_create_output_section_statements (void)
{
bfd_elf32_arm_set_target_relocs (output_bfd, &link_info, target1_is_rel,
target2_type, fix_v4bx, use_blx,
vfp11_denorm_fix, no_enum_size_warning);
vfp11_denorm_fix, no_enum_size_warning,
pic_veneer);
}
EOF
@ -259,6 +261,7 @@ PARSE_AND_LIST_PROLOGUE='
#define OPTION_USE_BLX 307
#define OPTION_VFP11_DENORM_FIX 308
#define OPTION_NO_ENUM_SIZE_WARNING 309
#define OPTION_PIC_VENEER 310
'
PARSE_AND_LIST_SHORTOPTS=p
@ -274,6 +277,7 @@ PARSE_AND_LIST_LONGOPTS='
{ "use-blx", no_argument, NULL, OPTION_USE_BLX},
{ "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
{ "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
{ "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
'
PARSE_AND_LIST_OPTIONS='
@ -286,6 +290,7 @@ PARSE_AND_LIST_OPTIONS='
fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n"));
fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible enum sizes\n"));
fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
'
PARSE_AND_LIST_ARGS_CASES='
@ -335,6 +340,10 @@ PARSE_AND_LIST_ARGS_CASES='
case OPTION_NO_ENUM_SIZE_WARNING:
no_enum_size_warning = 1;
break;
case OPTION_PIC_VENEER:
pic_veneer = 1;
break;
'
# We have our own after_open and before_allocation functions, but they call

7
ld/ld.texinfo
View File

@ -5406,6 +5406,13 @@ trampoline address instead of the function address. This is typically the
case when a pointer to a function is taken. The pointer will in fact
point to the function trampoline.
@cindex PIC_VENEER
@kindex --pic-veneer
The @samp{--pic-veneer} switch makes the linker use PIC sequences for
ARM/Thumb interworking veneers, even if the rest of the binary
is not PIC. This avoids problems on uClinux targets where
@samp{--emit-relocs} is used to generate relocatable binaries.
@ifclear GENERIC
@lowersections
@end ifclear

6
ld/testsuite/ChangeLog
View File

@ -1,3 +1,9 @@
2007-03-20 Paul Brook <paul@codesourcery.com>
* ld-arm/arm-elf.exp (ld-arm/arm-elf.exp): Add arm-pic-veneer.
* ld-arm/arm-pic-veneer.d: New test.
* ld-arm/arm-pic-veneer.s: New test.
2007-03-08 Richard Sandiford <richard@codesourcery.com>
* ld-elf/extract-symbol-1.ld (data): Explicitly set the start address

3
ld/testsuite/ld-arm/arm-elf.exp
View File

@ -156,6 +156,9 @@ set armelftests {
{"Unwinding and -gc-sections" "-gc-sections" "" {gc-unwind.s}
{{objdump -sj.data gc-unwind.d}}
"gc-unwind"}
{"arm-pic-veneer" "-static -T arm.ld --pic-veneer" "" {arm-pic-veneer.s}
{{objdump -d arm-pic-veneer.d}}
"arm-pic-veneer"}
}
run_ld_link_tests $armelftests

17
ld/testsuite/ld-arm/arm-pic-veneer.d Normal file
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@ -0,0 +1,17 @@
.*: file format.*
Disassembly of section .text:
00008000 <_start>:
8000: ea000000 b 8008 <__foo_from_arm>
00008004 <foo>:
8004: 46c0 nop \(mov r8, r8\)
8006: 4770 bx lr
00008008 <__foo_from_arm>:
8008: e59fc004 ldr ip, \[pc, #4\] ; 8014 <__foo_from_arm\+0xc>
800c: e08cc00f add ip, ip, pc
8010: e12fff1c bx ip
8014: fffffff1 undefined instruction 0xfffffff1

14
ld/testsuite/ld-arm/arm-pic-veneer.s Normal file
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@ -0,0 +1,14 @@
.text
.arm
.global _start
.type _start, %function
_start:
b foo
.thumb
.global foo
.type foo, %function
foo:
nop
bx lr