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[ARM] FDPIC: Implement Thumb-only PLT for FDPIC. 

2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
	Mickaël Guêné  <mickael.guene@st.com>

	bfd/
	* elf32-arm.c (elf32_arm_fdpic_thumb_plt_entry): New.
	(elf32_arm_plt_needs_thumb_stub_p): Handle thumb-only case.
	(elf32_arm_populate_plt_entry): Likewise.
	(elf32_arm_output_plt_map_1): Likewise.
	(elf32_arm_output_arch_local_syms): Likewise.

	ld/testsuite/
	* arm-elf.exp: Execute the new FDPIC Thumb-only tests.
	* fdpic-main-m.d: New test.
	* fdpic-main-m.s: New.
	* fdpic-main-m.sym: New.
	* fdpic-shared-m.d: New test.
	* fdpic-shared-m.s: New.
	* fdpic-shared-m.sym: New.
This commit is contained in:
Christophe Lyon 2018-03-20 10:56:17 +01:00 committed by Christophe Lyon
parent 4b86cbe91c
commit 59029f57eb
10 changed files with 352 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
bfd/ChangeLog
View File

@ -1,3 +1,12 @@
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
Mickaël Guêné <mickael.guene@st.com>
* elf32-arm.c (elf32_arm_fdpic_thumb_plt_entry): New.
(elf32_arm_plt_needs_thumb_stub_p): Handle thumb-only case.
(elf32_arm_populate_plt_entry): Likewise.
(elf32_arm_output_plt_map_1): Likewise.
(elf32_arm_output_arch_local_syms): Likewise.
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
Mickaël Guêné <mickael.guene@st.com>

64
bfd/elf32-arm.c
View File

@ -2290,6 +2290,22 @@ static const bfd_vma elf32_arm_fdpic_plt_entry [] =
0xe599f000, /* ldr pc, [r9] */
};
/* Thumb FDPIC PLT entry. */
/* The last 5 words contain PLT lazy fragment code and data. */
static const bfd_vma elf32_arm_fdpic_thumb_plt_entry [] =
{
0xc00cf8df, /* ldr.w r12, .L1 */
0x0c09eb0c, /* add.w r12, r12, r9 */
0x9004f8dc, /* ldr.w r9, [r12, #4] */
0xf000f8dc, /* ldr.w pc, [r12] */
0x00000000, /* .L1 .word foo(GOTOFFFUNCDESC) */
0x00000000, /* .L2 .word foo(funcdesc_value_reloc_offset) */
0xc008f85f, /* ldr.w r12, .L2 */
0xcd04f84d, /* push {r12} */
0xc004f8d9, /* ldr.w r12, [r9, #4] */
0xf000f8d9, /* ldr.w pc, [r9] */
};
#ifdef FOUR_WORD_PLT
/* The first entry in a procedure linkage table looks like
@ -3620,6 +3636,8 @@ elf32_arm_get_plt_info (bfd *abfd, struct elf32_arm_link_hash_table *globals,
return TRUE;
}
static bfd_boolean using_thumb_only (struct elf32_arm_link_hash_table *globals);
/* Return true if the PLT described by ARM_PLT requires a Thumb stub
before it. */
@ -3630,8 +3648,9 @@ elf32_arm_plt_needs_thumb_stub_p (struct bfd_link_info *info,
struct elf32_arm_link_hash_table *htab;
htab = elf32_arm_hash_table (info);
return (arm_plt->thumb_refcount != 0
|| (!htab->use_blx && arm_plt->maybe_thumb_refcount != 0));
return (!using_thumb_only(htab) && (arm_plt->thumb_refcount != 0
|| (!htab->use_blx && arm_plt->maybe_thumb_refcount != 0)));
}
/* Return a pointer to the head of the dynamic reloc list that should
@ -9729,6 +9748,10 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info,
}
else if (htab->fdpic_p)
{
const bfd_vma *plt_entry = using_thumb_only(htab)
? elf32_arm_fdpic_thumb_plt_entry
: elf32_arm_fdpic_plt_entry;
/* Fill-up Thumb stub if needed. */
if (elf32_arm_plt_needs_thumb_stub_p (info, arm_plt))
{
@ -9737,14 +9760,13 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info,
put_thumb_insn (htab, output_bfd,
elf32_arm_plt_thumb_stub[1], ptr - 2);
}
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[0], ptr + 0);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[1], ptr + 4);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[2], ptr + 8);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[3], ptr + 12);
/* As we are using 32 bit instructions even for the Thumb
version, we have to use 'put_arm_insn' instead of
'put_thumb_insn'. */
put_arm_insn(htab, output_bfd, plt_entry[0], ptr + 0);
put_arm_insn(htab, output_bfd, plt_entry[1], ptr + 4);
put_arm_insn(htab, output_bfd, plt_entry[2], ptr + 8);
put_arm_insn(htab, output_bfd, plt_entry[3], ptr + 12);
bfd_put_32 (output_bfd, got_offset, ptr + 16);
if (!(info->flags & DF_BIND_NOW))
@ -9753,14 +9775,10 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info,
bfd_put_32 (output_bfd,
htab->root.srelplt->reloc_count * RELOC_SIZE (htab),
ptr + 20);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[6], ptr + 24);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[7], ptr + 28);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[8], ptr + 32);
put_arm_insn(htab, output_bfd,
elf32_arm_fdpic_plt_entry[9], ptr + 36);
put_arm_insn(htab, output_bfd, plt_entry[6], ptr + 24);
put_arm_insn(htab, output_bfd, plt_entry[7], ptr + 28);
put_arm_insn(htab, output_bfd, plt_entry[8], ptr + 32);
put_arm_insn(htab, output_bfd, plt_entry[9], ptr + 36);
}
}
else if (using_thumb_only (htab))
@ -17767,15 +17785,19 @@ elf32_arm_output_plt_map_1 (output_arch_syminfo *osi,
}
else if (htab->fdpic_p)
{
enum map_symbol_type type = using_thumb_only(htab)
? ARM_MAP_THUMB
: ARM_MAP_ARM;
if (elf32_arm_plt_needs_thumb_stub_p (osi->info, arm_plt))
if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr - 4))
return FALSE;
if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr))
if (!elf32_arm_output_map_sym (osi, type, addr))
return FALSE;
if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 16))
return FALSE;
if (htab->plt_entry_size == 4 * ARRAY_SIZE(elf32_arm_fdpic_plt_entry))
if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 24))
if (!elf32_arm_output_map_sym (osi, type, addr + 24))
return FALSE;
}
else if (using_thumb_only (htab))
@ -18134,7 +18156,7 @@ elf32_arm_output_arch_local_syms (bfd *output_bfd,
if (!elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, 0))
return FALSE;
}
else if (using_thumb_only (htab))
else if (using_thumb_only (htab) && !htab->fdpic_p)
{
if (!elf32_arm_output_map_sym (&osi, ARM_MAP_THUMB, 0))
return FALSE;

11
ld/ChangeLog
View File

@ -1,3 +1,14 @@
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
Mickaël Guêné <mickael.guene@st.com>
* testsuite/ld-arm/arm-elf.exp: Execute the new FDPIC Thumb-only tests.
* testsuite/ld-arm/fdpic-main-m.d: New test.
* testsuite/ld-arm/fdpic-main-m.s: New.
* testsuite/ld-arm/fdpic-main-m.sym: New.
* testsuite/ld-arm/fdpic-shared-m.d: New test.
* testsuite/ld-arm/fdpic-shared-m.s: New.
* testsuite/ld-arm/fdpic-shared-m.sym: New.
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
Mickaël Guêné <mickael.guene@st.com>

12
ld/testsuite/ld-arm/arm-elf.exp
View File

@ -1043,6 +1043,18 @@ set armfdpiceabitests {
{{objdump -fdw fdpic-main.d} {objdump -Rw fdpic-main.r}
{readelf -Ds fdpic-main.sym}}
"fdpic-main"}
{"FDPIC ARM shared library little endian M profile"
"-shared -T fdpic-shared.ld --hash-style=sysv -EL -m armelf_linux_fdpiceabi" ""
"-EL -fdpic" {fdpic-shared-m.s}
{{objdump -fdw fdpic-shared-m.d} {objdump -Rw fdpic-shared.r}
{readelf -Ds fdpic-shared-m.sym}}
"fdpic-shared.so"}
{"FDPIC ARM dynamic executable little endian M profile"
"tmpdir/fdpic-shared.so -T fdpic-main.ld --hash-style=sysv -EL -m armelf_linux_fdpiceabi" ""
"-EL -fdpic" {fdpic-main-m.s}
{{objdump -fdw fdpic-main-m.d} {objdump -Rw fdpic-main.r}
{readelf -Ds fdpic-main-m.sym}}
"fdpic-main"}
}
# Massage the $armeabitests_common list into run_ld_link_tests standard form.

73
ld/testsuite/ld-arm/fdpic-main-m.d Normal file
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@ -0,0 +1,73 @@
tmpdir/fdpic-main: file format elf32-(little|big)arm
architecture: arm.*, flags 0x00000112:
EXEC_P, HAS_SYMS, D_PAGED
start address 0x.*
Disassembly of section .plt:
.* <.plt>:
.*: f8df c00c ldr.w ip, \[pc, #12\] ; .* <.plt\+0x10>
.*: eb0c 0c09 add.w ip, ip, r9
.*: f8dc 9004 ldr.w r9, \[ip, #4\]
.*: f8dc f000 ldr.w pc, \[ip\]
.*: 0000000c .word 0x0000000c
.*: 00000000 .word 0x00000000
.*: f85f c008 ldr.w ip, \[pc, #-8\] ; .* <.plt\+0x14>
.*: f84d cd04 str.w ip, \[sp, #-4\]!
.*: f8d9 c004 ldr.w ip, \[r9, #4\]
.*: f8d9 f000 ldr.w pc, \[r9\]
.*: f8df c00c ldr.w ip, \[pc, #12\] ; .* <.plt\+0x38>
.*: eb0c 0c09 add.w ip, ip, r9
.*: f8dc 9004 ldr.w r9, \[ip, #4\]
.*: f8dc f000 ldr.w pc, \[ip]
.*: 00000014 .word 0x00000014
.*: 00000008 .word 0x00000008
.*: f85f c008 ldr.w ip, \[pc, #-8\] ; .* <.plt\+0x3c>
.*: f84d cd04 str.w ip, \[sp, #-4\]!
.*: f8d9 c004 ldr.w ip, \[r9, #4\]
.*: f8d9 f000 ldr.w pc, \[r9\]
Disassembly of section .text:
.* <_start>:
.*: f000 b800 b.w .* <main>
.* <main>:
.*: 4a11 ldr r2, \[pc, #68\] ; .* <main\+0x48>.*
.*: 4b12 ldr r3, \[pc, #72\] ; .* <main\+0x4c>.*
.*: b570 push {r4, r5, r6, lr}
.*: f859 5002 ldr.w r5, \[r9, r2\]
.*: 464c mov r4, r9
.*: f859 3003 ldr.w r3, \[r9, r3\]
.*: 602b str r3, \[r5, #0\]
.*: f7ff ffcb bl .* <.plt>
.*: 4606 mov r6, r0
.*: 46a1 mov r9, r4
.*: 6828 ldr r0, \[r5, #0\]
.*: 46a1 mov r9, r4
.*: f7ff ffd9 bl .* <.plt\+0x28>
.*: 4b0b ldr r3, \[pc, #44\] ; .* <main\+0x50>.*
.*: 46a1 mov r9, r4
.*: 444b add r3, r9
.*: 4618 mov r0, r3
.*: 602b str r3, \[r5, #0\]
.*: 46a1 mov r9, r4
.*: f7ff ffd1 bl .* <.plt\+0x28>
.*: 4b08 ldr r3, \[pc, #32\] ; .* <main\+0x54>.*
.*: 46a1 mov r9, r4
.*: f859 3003 ldr.w r3, \[r9, r3\]
.*: 6818 ldr r0, \[r3, #0\]
.*: 46a1 mov r9, r4
.*: f7ff ffc9 bl .* <.plt\+0x28>
.*: 4630 mov r0, r6
.*: 46a1 mov r9, r4
.*: bd70 pop {r4, r5, r6, pc}
.*: 0000002c .word 0x0000002c
.*: 00000024 .word 0x00000024
.*: 0000001c .word 0x0000001c
.*: 00000028 .word 0x00000028
.* <my_local_func>:
.*: 4770 bx lr
.*: bf00 nop

86
ld/testsuite/ld-arm/fdpic-main-m.s Normal file
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@ -0,0 +1,86 @@
.arch armv7-m
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 2
.eabi_attribute 30, 2
.eabi_attribute 34, 1
.eabi_attribute 18, 4
.file "hello.c"
.text
.align 2
.syntax unified
.thumb
.fpu softvfp
.type my_local_func, %function
my_local_func:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
bx lr
.size my_local_func, .-my_local_func
.section .text.startup,"ax",%progbits
.align 2
.global _start
.syntax unified
.thumb
.fpu softvfp
.type _start, %function
_start:
b main
.global main
.syntax unified
.thumb
.fpu softvfp
.type main, %function
main:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
ldr r2, .L4
ldr r3, .L4+4
push {r4, r5, r6, lr}
ldr r5, [r9, r2]
mov r4, r9
ldr r3, [r9, r3]
str r3, [r5]
bl my_shared_func1(PLT)
mov r6, r0
mov r9, r4
ldr r0, [r5]
mov r9, r4
bl my_shared_func2(PLT)
ldr r3, .L4+8
mov r9, r4
add r3, r3, r9
mov r0, r3
str r3, [r5]
mov r9, r4
bl my_shared_func2(PLT)
ldr r3, .L4+12
mov r9, r4
ldr r3, [r9, r3]
ldr r0, [r3]
mov r9, r4
bl my_shared_func2(PLT)
mov r0, r6
mov r9, r4
pop {r4, r5, r6, pc}
.L5:
.align 2
.L4:
.word funcptr(GOT)
.word my_shared_func1(GOTFUNCDESC)
.word my_local_func(GOTOFFFUNCDESC)
.word funcptr2(GOT)
.size main, .-main
.global funcptr2
.comm funcptr,4,4
.section .data.rel,"aw",%progbits
.align 2
.type funcptr2, %object
.size funcptr2, 4
funcptr2:
.word my_shared_func1(FUNCDESC)

14
ld/testsuite/ld-arm/fdpic-main-m.sym Normal file
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@ -0,0 +1,14 @@
Symbol table for image:
+Num +Buc: +Value +Size +Type +Bind +Vis +Ndx +Name
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +12 _edata
+.. +..: ........ +0 +FUNC +GLOBAL +DEFAULT +UND my_shared_func2
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +12 __bss_start__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +13 _end
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +13 __bss_end__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +13 __end__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT + 9 __ROFIXUP_LIST__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +12 __bss_start
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT + 9 __ROFIXUP_END__
+.. +..: ........ +0 +FUNC +GLOBAL +DEFAULT +UND my_shared_func1
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +13 _bss_end__

37
ld/testsuite/ld-arm/fdpic-shared-m.d Normal file
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@ -0,0 +1,37 @@
tmpdir/fdpic-shared.so: file format elf32-(little|big)arm
architecture: arm.*, flags 0x00000150:
HAS_SYMS, DYNAMIC, D_PAGED
start address 0x.*
Disassembly of section .plt:
.* <.plt>:
.*: f8df c00c ldr.w ip, \[pc, #12\] ; .* <.plt\+0x10>
.*: eb0c 0c09 add.w ip, ip, r9
.*: f8dc 9004 ldr.w r9, \[ip, #4\]
.*: f8dc f000 ldr.w pc, \[ip\]
.*: 0000000c .word 0x0000000c
.*: 00000000 .word 0x00000000
.*: f85f c008 ldr.w ip, \[pc, #-8\] ; .* <.plt\+0x14>
.*: f84d cd04 str.w ip, \[sp, #-4\]!
.*: f8d9 c004 ldr.w ip, \[r9, #4\]
.*: f8d9 f000 ldr.w pc, \[r9\]
Disassembly of section .text:
.* <my_shared_func1>:
.*: 4770 bx lr
.*: bf00 nop
.* <my_shared_func3>:
.*: f04f 0000 mov.w r0, #0
.*: 4770 bx lr
.*: bf00 nop
.* <my_shared_func2>:
.*: b510 push {r4, lr}
.*: 464c mov r4, r9
.*: f7ff ffe2 bl .* <.plt>
.*: 46a1 mov r9, r4
.*: bd10 pop {r4, pc}

52
ld/testsuite/ld-arm/fdpic-shared-m.s Normal file
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@ -0,0 +1,52 @@
.arch armv7-m
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 2
.eabi_attribute 30, 2
.eabi_attribute 34, 1
.eabi_attribute 18, 4
.file "shared.c"
.text
.align 2
.global my_shared_func1
.syntax unified
.thumb
.fpu softvfp
.type my_shared_func1, %function
my_shared_func1:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
bx lr
.size my_shared_func1, .-my_shared_func1
.align 2
.global my_shared_func3
.syntax unified
.thumb
.fpu softvfp
.type my_shared_func3, %function
my_shared_func3:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
mov r0, #0
bx lr
.size my_shared_func3, .-my_shared_func3
.align 2
.global my_shared_func2
.syntax unified
.thumb
.fpu softvfp
.type my_shared_func2, %function
my_shared_func2:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
push {r4, lr}
mov r4, r9
bl my_shared_func3(PLT)
mov r9, r4
pop {r4, pc}
.size my_shared_func2, .-my_shared_func2

15
ld/testsuite/ld-arm/fdpic-shared-m.sym Normal file
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@ -0,0 +1,15 @@
Symbol table for image:
+Num +Buc: +Value +Size +Type +Bind +Vis +Ndx +Name
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 _edata
+.. +..: ........ +12 +FUNC +GLOBAL +DEFAULT +6 my_shared_func2
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 __bss_start__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 _end
+.. +..: ........ +6 +FUNC +GLOBAL +DEFAULT +6 my_shared_func3
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 __bss_end__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 __end__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +7 __ROFIXUP_LIST__
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 __bss_start
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +7 __ROFIXUP_END__
+.. +..: ........ +2 +FUNC +GLOBAL +DEFAULT +6 my_shared_func1
+.. +..: ........ +0 +NOTYPE +GLOBAL +DEFAULT +9 _bss_end__