http://sourceware.org/bugzilla/show_bug.cgi?id=14105
Bug #: 14105
Summary: .plt has no associated .eh_frame/.debug_frame
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: minor
Priority: P2
Component: ld
AssignedTo: unassig...@sourceware.org
ReportedBy: hjl.to...@gmail.com
CC: f...@redhat.com, jan.kratoch...@redhat.com
Depends on: 12570
Blocks: 12571
Classification: Unclassified
Target: x86_64-unknown-linux-gnu
+++ This bug was initially created as a clone of Bug #12570 +++
[hjl@gnu-6 pr12570]$ cat x.c
void foo (void);
void
bar ()
{
foo ();
}
[hjl@gnu-6 pr12570]$ cat dummy.S
[hjl@gnu-6 pr12570]$ make
gcc -O2 -fpic -c -o x.o x.c
./ld -shared -o x.so x.o
gcc -c -O2 -fpic -o dummy.o dummy.S
./ld -shared -o y.so dummy.o x.o
readelf -wf x.so
Contents of the .eh_frame section:
00000000 00000014 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 1
Data alignment factor: -8
Return address column: 16
Augmentation data: 1b
DW_CFA_def_cfa: r7 (rsp) ofs 8
DW_CFA_offset: r16 (rip) at cfa-8
DW_CFA_nop
DW_CFA_nop
00000018 00000014 0000001c FDE cie=00000000 pc=00000260..00000265
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
readelf -wf y.so
Contents of the .eh_frame section:
00000000 00000014 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 1
Data alignment factor: -8
Return address column: 16
Augmentation data: 1b
DW_CFA_def_cfa: r7 (rsp) ofs 8
DW_CFA_offset: r16 (rip) at cfa-8
DW_CFA_nop
DW_CFA_nop
00000018 00000024 0000001c FDE cie=00000000 pc=00000240..00000260
DW_CFA_def_cfa_offset: 16
DW_CFA_advance_loc: 6 to 00000246
DW_CFA_def_cfa_offset: 24
DW_CFA_advance_loc: 10 to 00000250
DW_CFA_def_cfa_expression (DW_OP_breg7 (rsp): 8; DW_OP_breg16 (rip): 0;
DW_OP_lit15; DW_OP_and; DW_OP_lit11; DW_OP_ge; DW_OP_lit3; DW_OP_shl;
DW_OP_plus)
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
00000040 00000014 00000044 FDE cie=00000000 pc=00000260..00000265
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
[hjl@gnu-6 pr12570]$
Linker doesn't always generate unwind info for PLT.
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