https://sourceware.org/bugzilla/show_bug.cgi?id=32298
Bug ID: 32298
Summary: sframe: no SFrame stack trace info generated for
.plt.got
Product: binutils
Version: 2.43
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: indu.bhagat at oracle dot com
Target Milestone: ---
The linker currently does not generate any SFrame stack trace information for
the .plt.got sections. There is SFrame information for other PLT sections
(.plt, .plt.sec) though.
$ cat bar.c
void foo ();
unsigned long var;
void test () {
var = (unsigned long)foo;
foo ();
}
$ cat foo.s
.globl foo
foo:
.section .note.GNU-stack,"",@progbits
$ as --gsframe -o foo.o foo.s
$ gcc -O2 -Wa,--gsframe -fPIC -c -o bar.o bar.c
$ ld -shared -z now -o pltsec.so foo.o bar.o
$ objdump -d pltsec.so
...
Disassembly of section .plt:
0000000000001000 <.plt>:
1000: ff 35 da 2f 00 00 push 0x2fda(%rip) # 3fe0
<_GLOBAL_OFFSET_TABLE_+0x8>
1006: ff 25 dc 2f 00 00 jmp *0x2fdc(%rip) # 3fe8
<_GLOBAL_OFFSET_TABLE_+0x10>
100c: 0f 1f 40 00 nopl 0x0(%rax)
Disassembly of section .plt.got:
0000000000001010 <foo@plt>:
1010: ff 25 e2 2f 00 00 jmp *0x2fe2(%rip) # 3ff8
<foo+0x2fd8>
1016: 66 90 xchg %ax,%ax
Disassembly of section .text:
0000000000001020 <test>:
1020: 48 8b 05 c9 2f 00 00 mov 0x2fc9(%rip),%rax # 3ff0
<var-0x10>
1027: 48 8b 15 ca 2f 00 00 mov 0x2fca(%rip),%rdx # 3ff8
<foo+0x2fd8>
102e: 48 89 10 mov %rdx,(%rax)
1031: 31 c0 xor %eax,%eax
1033: e9 d8 ff ff ff jmp 1010 <foo@plt>
$ objdump --sframe pltsec.so
...
Contents of the SFrame section .sframe:
Header :
Version: SFRAME_VERSION_2
Flags: SFRAME_F_FDE_SORTED
CFA fixed RA offset: -8
Num FDEs: 2
Num FREs: 3
Function Index :
func idx [0]: pc = 0x1000, size = 16 bytes
STARTPC CFA FP RA
0000000000001000 sp+16 u f
0000000000001006 sp+24 u f
func idx [1]: pc = 0x1020, size = 24 bytes
STARTPC CFA FP RA
0000000000001020 sp+8 u f
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