https://sourceware.org/bugzilla/show_bug.cgi?id=22061
Bug ID: 22061
Summary: Missing unwind info for IBT PLT
Product: binutils
Version: 2.29
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: i386
[hjl@gnu-6 ld]$ cat
/export/gnu/import/git/sources/binutils-gdb/ld/testsuite/ld-i386/ibt-plt-1.s
.text
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
pushl %ebx
.cfi_def_cfa_offset 8
.cfi_offset 3, -8
call __x86.get_pc_thunk.bx
addl $_GLOBAL_OFFSET_TABLE_, %ebx
subl $8, %esp
.cfi_def_cfa_offset 16
call bar2@PLT
call bar1@PLT
addl $8, %esp
.cfi_def_cfa_offset 8
popl %ebx
.cfi_restore 3
.cfi_def_cfa_offset 4
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.section .note.GNU-stack,"",@progbits
.section
.text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
.globl __x86.get_pc_thunk.bx
.hidden __x86.get_pc_thunk.bx
.type __x86.get_pc_thunk.bx, @function
__x86.get_pc_thunk.bx:
.LFB1:
.cfi_startproc
movl (%esp), %ebx
ret
.cfi_endproc
.LFE1:
.section ".note.gnu.property", "a"
.p2align 2
.long 1f - 0f /* name length */
.long 5f - 2f /* data length */
.long 5 /* note type */
0: .asciz "GNU" /* vendor name */
1:
.p2align 2
2: .long 0xc0000002 /* pr_type. */
.long 4f - 3f /* pr_datasz. */
3:
.long 0x1
4:
.p2align 2
5:
/export/build/gnu/binutils/build-x86_64-linux/ld/../gas/as-new --32 -o
tmpdir/ibt-plt-1.o
/export/gnu/import/git/sources/binutils-gdb/ld/testsuite/ld-i386/ibt-plt-1.s
ld -z norelro
-L/export/gnu/import/git/sources/binutils-gdb/ld/testsuite/ld-i386 -shared -m
elf_i386 --hash-style=sysv -o tmpdir/dump tmpdir/ibt-plt-1.o
objdump -dw tmpdir/dump
readelf -wf tmpdir/dump
tmpdir/dump: file format elf32-i386
Disassembly of section .plt:
000001b0 <.plt>:
1b0: ff b3 04 00 00 00 pushl 0x4(%ebx)
1b6: ff a3 08 00 00 00 jmp *0x8(%ebx)
1bc: 0f 1f 40 00 nopl 0x0(%eax)
1c0: f3 0f 1e fb endbr32
1c4: 68 00 00 00 00 push $0x0
1c9: e9 e2 ff ff ff jmp 1b0 <.plt>
1ce: 66 90 xchg %ax,%ax
1d0: f3 0f 1e fb endbr32
1d4: 68 08 00 00 00 push $0x8
1d9: e9 d2 ff ff ff jmp 1b0 <.plt>
1de: 66 90 xchg %ax,%ax
Disassembly of section .plt.sec:
000001e0 <bar1@plt>:
1e0: f3 0f 1e fb endbr32
1e4: ff a3 0c 00 00 00 jmp *0xc(%ebx)
1ea: 66 0f 1f 44 00 00 nopw 0x0(%eax,%eax,1)
000001f0 <bar2@plt>:
1f0: f3 0f 1e fb endbr32
1f4: ff a3 10 00 00 00 jmp *0x10(%ebx)
1fa: 66 0f 1f 44 00 00 nopw 0x0(%eax,%eax,1)
Disassembly of section .text:
00000200 <foo>:
200: 53 push %ebx
201: e8 18 00 00 00 call 21e <__x86.get_pc_thunk.bx>
206: 81 c3 22 11 00 00 add $0x1122,%ebx
20c: 83 ec 08 sub $0x8,%esp
20f: e8 dc ff ff ff call 1f0 <bar2@plt>
214: e8 c7 ff ff ff call 1e0 <bar1@plt>
219: 83 c4 08 add $0x8,%esp
21c: 5b pop %ebx
21d: c3 ret
0000021e <__x86.get_pc_thunk.bx>:
21e: 8b 1c 24 mov (%esp),%ebx
221: c3 ret
Contents of the .eh_frame section:
00000000 00000014 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 1
Data alignment factor: -4
Return address column: 8
Augmentation data: 1b
DW_CFA_def_cfa: r4 (esp) ofs 4
DW_CFA_offset: r8 (eip) at cfa-4
DW_CFA_nop
DW_CFA_nop
00000018 0000001c 0000001c FDE cie=00000000 pc=00000200..0000021e
DW_CFA_advance_loc: 1 to 00000201
DW_CFA_def_cfa_offset: 8
DW_CFA_offset: r3 (ebx) at cfa-8
DW_CFA_advance_loc: 14 to 0000020f
DW_CFA_def_cfa_offset: 16
DW_CFA_advance_loc: 13 to 0000021c
DW_CFA_def_cfa_offset: 8
DW_CFA_advance_loc: 1 to 0000021d
DW_CFA_restore: r3 (ebx)
DW_CFA_def_cfa_offset: 4
00000038 00000010 0000003c FDE cie=00000000 pc=0000021e..00000222
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
0000004c 00000020 00000050 FDE cie=00000000 pc=000001b0..000001e0
DW_CFA_def_cfa_offset: 8
DW_CFA_advance_loc: 6 to 000001b6
DW_CFA_def_cfa_offset: 12
DW_CFA_advance_loc: 10 to 000001c0
DW_CFA_def_cfa_expression (DW_OP_breg4 (esp): 4; DW_OP_breg8 (eip): 0;
DW_OP_lit15; DW_OP_and; DW_OP_lit9; DW_OP_ge; DW_OP_lit2; DW_OP_shl;
DW_OP_plus)
[hjl@gnu-6 ld]$
Unwind info is missing for section .plt.sec.
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