Re: [tip:objtool/urgent 9/23] vmlinux.o: warning: objtool: cdns_mrvl_xspi_setup_clock: unexpected end of section .text.cdns_mrvl_xspi_setup_clock
From: Nathan Chancellor
Date: Sat Mar 29 2025 - 16:07:08 EST
On Fri, Mar 28, 2025 at 09:46:06PM -0700, Josh Poimboeuf wrote:
> On Fri, Mar 28, 2025 at 04:24:49PM -0700, Nathan Chancellor wrote:
> > vmlinux.o: warning: objtool: synaptics_report_mt_data: unexpected end of section .text.synaptics_report_mt_data
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x33e: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x254: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x1d4: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x1b8: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x156: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x13a: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0xda: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0xbe: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x63: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x48: (branch)
> > vmlinux.o: warning: objtool: synaptics_report_mt_data+0x0: <=== (sym)
> > ./tools/objtool/objtool --hacks=jump_label --hacks=noinstr --static-call --uaccess --noinstr --link vmlinux.o.orig -o vmlinux.o
>
> Nice! Can you share the disassembly of the function?
Sure thing!
> objdump -drw -j .text.synaptics_report_mt_data vmlinux.o.orig
0000000000000000 <synaptics_report_mt_data>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 41 57 push %r15
6: 41 56 push %r14
8: 41 55 push %r13
a: 41 54 push %r12
c: 53 push %rbx
d: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
11: 48 83 ec 50 sub $0x50,%rsp
15: 41 89 d3 mov %edx,%r11d
18: 49 89 f7 mov %rsi,%r15
1b: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 22 <synaptics_report_mt_data+0x22> 1e: R_X86_64_PC32 __stack_chk_guard-0x4
22: 48 89 44 24 40 mov %rax,0x40(%rsp)
27: 4c 8b 75 08 mov 0x8(%rbp),%r14
2b: 48 c7 c0 00 00 00 00 mov $0x0,%rax 2e: R_X86_64_32S _text+0x7f000000
32: 49 29 c6 sub %rax,%r14
35: 48 8b 1c 25 00 00 00 00 mov 0x0,%rbx 39: R_X86_64_32S current_task
3d: 8b 05 00 00 00 00 mov 0x0(%rip),%eax # 43 <synaptics_report_mt_data+0x43> 3f: R_X86_64_PC32 __preempt_count-0x4
43: 25 00 01 ff 00 and $0xff0100,%eax
48: 74 10 je 5a <synaptics_report_mt_data+0x5a>
4a: 3d 00 01 00 00 cmp $0x100,%eax
4f: 75 35 jne 86 <synaptics_report_mt_data+0x86>
51: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
58: 74 2c je 86 <synaptics_report_mt_data+0x86>
5a: 8b 83 88 14 00 00 mov 0x1488(%rbx),%eax
60: 83 f8 02 cmp $0x2,%eax
63: 75 21 jne 86 <synaptics_report_mt_data+0x86>
65: 48 8b 83 90 14 00 00 mov 0x1490(%rbx),%rax
6c: 48 8b 08 mov (%rax),%rcx
6f: 48 8d 51 01 lea 0x1(%rcx),%rdx
73: 8b b3 8c 14 00 00 mov 0x148c(%rbx),%esi
79: 48 39 f2 cmp %rsi,%rdx
7c: 73 08 jae 86 <synaptics_report_mt_data+0x86>
7e: 48 89 10 mov %rdx,(%rax)
81: 4c 89 74 c8 08 mov %r14,0x8(%rax,%rcx,8)
86: 48 8b 07 mov (%rdi),%rax
89: 4c 8b 67 08 mov 0x8(%rdi),%r12
8d: 4c 89 7c 24 30 mov %r15,0x30(%rsp)
92: 48 8d 48 54 lea 0x54(%rax),%rcx
96: 48 89 4c 24 38 mov %rcx,0x38(%rsp)
9b: 48 b9 aa aa aa aa aa aa aa aa movabs $0xaaaaaaaaaaaaaaaa,%rcx
a5: 48 89 4c 24 28 mov %rcx,0x28(%rsp)
aa: 48 89 4c 24 20 mov %rcx,0x20(%rsp)
af: 44 89 d9 mov %r11d,%ecx
b2: 8b 15 00 00 00 00 mov 0x0(%rip),%edx # b8 <synaptics_report_mt_data+0xb8> b4: R_X86_64_PC32 __preempt_count-0x4
b8: 81 e2 00 01 ff 00 and $0xff0100,%edx
be: 74 11 je d1 <synaptics_report_mt_data+0xd1>
c0: 81 fa 00 01 00 00 cmp $0x100,%edx
c6: 75 5b jne 123 <synaptics_report_mt_data+0x123>
c8: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
cf: 74 52 je 123 <synaptics_report_mt_data+0x123>
d1: 8b 93 88 14 00 00 mov 0x1488(%rbx),%edx
d7: 83 fa 03 cmp $0x3,%edx
da: 75 47 jne 123 <synaptics_report_mt_data+0x123>
dc: 48 8b 93 90 14 00 00 mov 0x1490(%rbx),%rdx
e3: 44 8b 83 8c 14 00 00 mov 0x148c(%rbx),%r8d
ea: 49 c1 e0 03 shl $0x3,%r8
ee: 4c 8b 12 mov (%rdx),%r10
f1: 4c 89 d6 mov %r10,%rsi
f4: 48 c1 e6 05 shl $0x5,%rsi
f8: 4c 8d 4e 28 lea 0x28(%rsi),%r9
fc: 4d 39 c1 cmp %r8,%r9
ff: 77 22 ja 123 <synaptics_report_mt_data+0x123>
101: 49 ff c2 inc %r10
104: 4c 89 12 mov %r10,(%rdx)
107: 48 c7 44 32 08 05 00 00 00 movq $0x5,0x8(%rdx,%rsi,1)
110: 48 c7 44 32 10 01 00 00 00 movq $0x1,0x10(%rdx,%rsi,1)
119: 48 89 4c 32 18 mov %rcx,0x18(%rdx,%rsi,1)
11e: 4c 89 74 32 20 mov %r14,0x20(%rdx,%rsi,1)
123: 45 31 ed xor %r13d,%r13d
126: 41 83 fb 01 cmp $0x1,%r11d
12a: 41 0f 94 c5 sete %r13b
12e: 8b 15 00 00 00 00 mov 0x0(%rip),%edx # 134 <synaptics_report_mt_data+0x134> 130: R_X86_64_PC32 __preempt_count-0x4
134: 81 e2 00 01 ff 00 and $0xff0100,%edx
13a: 74 11 je 14d <synaptics_report_mt_data+0x14d>
13c: 81 fa 00 01 00 00 cmp $0x100,%edx
142: 75 5b jne 19f <synaptics_report_mt_data+0x19f>
144: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
14b: 74 52 je 19f <synaptics_report_mt_data+0x19f>
14d: 8b 93 88 14 00 00 mov 0x1488(%rbx),%edx
153: 83 fa 03 cmp $0x3,%edx
156: 75 47 jne 19f <synaptics_report_mt_data+0x19f>
158: 48 8b 93 90 14 00 00 mov 0x1490(%rbx),%rdx
15f: 44 8b 83 8c 14 00 00 mov 0x148c(%rbx),%r8d
166: 49 c1 e0 03 shl $0x3,%r8
16a: 4c 8b 12 mov (%rdx),%r10
16d: 4c 89 d6 mov %r10,%rsi
170: 48 c1 e6 05 shl $0x5,%rsi
174: 4c 8d 4e 28 lea 0x28(%rsi),%r9
178: 4d 39 c1 cmp %r8,%r9
17b: 77 22 ja 19f <synaptics_report_mt_data+0x19f>
17d: 49 ff c2 inc %r10
180: 4c 89 12 mov %r10,(%rdx)
183: 48 c7 44 32 08 05 00 00 00 movq $0x5,0x8(%rdx,%rsi,1)
18c: 48 c7 44 32 10 01 00 00 00 movq $0x1,0x10(%rdx,%rsi,1)
195: 48 89 4c 32 18 mov %rcx,0x18(%rdx,%rsi,1)
19a: 4c 89 74 32 20 mov %r14,0x20(%rdx,%rsi,1)
19f: 41 83 fb 02 cmp $0x2,%r11d
1a3: b9 02 00 00 00 mov $0x2,%ecx
1a8: 44 0f 4d e9 cmovge %ecx,%r13d
1ac: 8b 0d 00 00 00 00 mov 0x0(%rip),%ecx # 1b2 <synaptics_report_mt_data+0x1b2> 1ae: R_X86_64_PC32 __preempt_count-0x4
1b2: 81 e1 00 01 ff 00 and $0xff0100,%ecx
1b8: 74 11 je 1cb <synaptics_report_mt_data+0x1cb>
1ba: 81 f9 00 01 00 00 cmp $0x100,%ecx
1c0: 75 5b jne 21d <synaptics_report_mt_data+0x21d>
1c2: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
1c9: 74 52 je 21d <synaptics_report_mt_data+0x21d>
1cb: 8b 8b 88 14 00 00 mov 0x1488(%rbx),%ecx
1d1: 83 f9 03 cmp $0x3,%ecx
1d4: 75 47 jne 21d <synaptics_report_mt_data+0x21d>
1d6: 48 8b 8b 90 14 00 00 mov 0x1490(%rbx),%rcx
1dd: 44 8b 8b 8c 14 00 00 mov 0x148c(%rbx),%r9d
1e4: 49 c1 e1 03 shl $0x3,%r9
1e8: 48 8b 31 mov (%rcx),%rsi
1eb: 48 89 f2 mov %rsi,%rdx
1ee: 48 c1 e2 05 shl $0x5,%rdx
1f2: 4c 8d 42 28 lea 0x28(%rdx),%r8
1f6: 4d 39 c8 cmp %r9,%r8
1f9: 77 22 ja 21d <synaptics_report_mt_data+0x21d>
1fb: 48 ff c6 inc %rsi
1fe: 48 89 31 mov %rsi,(%rcx)
201: 48 c7 44 11 08 05 00 00 00 movq $0x5,0x8(%rcx,%rdx,1)
20a: 48 c7 44 11 10 00 00 00 00 movq $0x0,0x10(%rcx,%rdx,1)
213: 4c 89 6c 11 18 mov %r13,0x18(%rcx,%rdx,1)
218: 4c 89 74 11 20 mov %r14,0x20(%rcx,%rdx,1)
21d: 4d 85 ed test %r13,%r13
220: 48 89 7c 24 18 mov %rdi,0x18(%rsp)
225: 44 89 5c 24 0c mov %r11d,0xc(%rsp)
22a: 0f 84 85 00 00 00 je 2b5 <synaptics_report_mt_data+0x2b5>
230: 41 0f b7 0f movzwl (%r15),%ecx
234: 66 89 4c 24 28 mov %cx,0x28(%rsp)
239: 66 b9 e0 16 mov $0x16e0,%cx
23d: 66 ba e0 16 mov $0x16e0,%dx
241: 66 41 2b 57 04 sub 0x4(%r15),%dx
246: 66 89 54 24 2a mov %dx,0x2a(%rsp)
24b: 41 83 fb 01 cmp $0x1,%r11d
24f: 4c 89 7c 24 10 mov %r15,0x10(%rsp)
254: 0f 85 c8 00 00 00 jne 322 <synaptics_report_mt_data+0x322>
25a: 8b 0d 00 00 00 00 mov 0x0(%rip),%ecx # 260 <synaptics_report_mt_data+0x260> 25c: R_X86_64_PC32 __preempt_count-0x4
260: 81 e1 00 01 ff 00 and $0xff0100,%ecx
266: 74 19 je 281 <synaptics_report_mt_data+0x281>
268: 81 f9 00 01 00 00 cmp $0x100,%ecx
26e: 0f 85 15 01 00 00 jne 389 <synaptics_report_mt_data+0x389>
274: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
27b: 0f 84 08 01 00 00 je 389 <synaptics_report_mt_data+0x389>
281: 8b 8b 88 14 00 00 mov 0x1488(%rbx),%ecx
287: 83 f9 02 cmp $0x2,%ecx
28a: 0f 85 f9 00 00 00 jne 389 <synaptics_report_mt_data+0x389>
290: 48 8b 8b 90 14 00 00 mov 0x1490(%rbx),%rcx
297: 48 8b 11 mov (%rcx),%rdx
29a: 48 8d 72 01 lea 0x1(%rdx),%rsi
29e: 8b bb 8c 14 00 00 mov 0x148c(%rbx),%edi
2a4: 48 39 fe cmp %rdi,%rsi
2a7: 0f 83 dc 00 00 00 jae 389 <synaptics_report_mt_data+0x389>
2ad: 48 89 31 mov %rsi,(%rcx)
2b0: e9 cf 00 00 00 jmp 384 <synaptics_report_mt_data+0x384>
2b5: 8b 0d 00 00 00 00 mov 0x0(%rip),%ecx # 2bb <synaptics_report_mt_data+0x2bb> 2b7: R_X86_64_PC32 __preempt_count-0x4
2bb: 81 e1 00 01 ff 00 and $0xff0100,%ecx
2c1: 74 11 je 2d4 <synaptics_report_mt_data+0x2d4>
2c3: 81 f9 00 01 00 00 cmp $0x100,%ecx
2c9: 75 35 jne 300 <synaptics_report_mt_data+0x300>
2cb: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
2d2: 74 2c je 300 <synaptics_report_mt_data+0x300>
2d4: 8b 8b 88 14 00 00 mov 0x1488(%rbx),%ecx
2da: 83 f9 02 cmp $0x2,%ecx
2dd: 75 21 jne 300 <synaptics_report_mt_data+0x300>
2df: 48 8b 8b 90 14 00 00 mov 0x1490(%rbx),%rcx
2e6: 48 8b 11 mov (%rcx),%rdx
2e9: 48 8d 72 01 lea 0x1(%rdx),%rsi
2ed: 8b bb 8c 14 00 00 mov 0x148c(%rbx),%edi
2f3: 48 39 fe cmp %rdi,%rsi
2f6: 73 08 jae 300 <synaptics_report_mt_data+0x300>
2f8: 48 89 31 mov %rsi,(%rcx)
2fb: 4c 89 74 d1 08 mov %r14,0x8(%rcx,%rdx,8)
300: 8b 40 20 mov 0x20(%rax),%eax
303: 01 c0 add %eax,%eax
305: 44 8d 04 80 lea (%rax,%rax,4),%r8d
309: 48 8d 74 24 20 lea 0x20(%rsp),%rsi
30e: 48 8d 54 24 28 lea 0x28(%rsp),%rdx
313: 4c 89 e7 mov %r12,%rdi
316: 31 c9 xor %ecx,%ecx
318: e8 00 00 00 00 call 31d <synaptics_report_mt_data+0x31d> 319: R_X86_64_PLT32 input_mt_assign_slots-0x4
31d: e9 ae 01 00 00 jmp 4d0 <synaptics_report_mt_data+0x4d0>
322: 0f b7 50 54 movzwl 0x54(%rax),%edx
326: 66 89 54 24 2c mov %dx,0x2c(%rsp)
32b: 66 2b 48 58 sub 0x58(%rax),%cx
32f: 66 89 4c 24 2e mov %cx,0x2e(%rsp)
334: 8b 0d 00 00 00 00 mov 0x0(%rip),%ecx # 33a <synaptics_report_mt_data+0x33a> 336: R_X86_64_PC32 __preempt_count-0x4
33a: 41 83 fb 02 cmp $0x2,%r11d
33e: 0f 8c fd 01 00 00 jl 541 <synaptics_report_mt_data+0x541>
344: 81 e1 00 01 ff 00 and $0xff0100,%ecx
34a: 74 11 je 35d <synaptics_report_mt_data+0x35d>
34c: 81 f9 00 01 00 00 cmp $0x100,%ecx
352: 75 35 jne 389 <synaptics_report_mt_data+0x389>
354: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
35b: 74 2c je 389 <synaptics_report_mt_data+0x389>
35d: 8b 8b 88 14 00 00 mov 0x1488(%rbx),%ecx
363: 83 f9 02 cmp $0x2,%ecx
366: 75 21 jne 389 <synaptics_report_mt_data+0x389>
368: 48 8b 8b 90 14 00 00 mov 0x1490(%rbx),%rcx
36f: 48 8b 11 mov (%rcx),%rdx
372: 48 8d 72 01 lea 0x1(%rdx),%rsi
376: 8b bb 8c 14 00 00 mov 0x148c(%rbx),%edi
37c: 48 39 fe cmp %rdi,%rsi
37f: 73 08 jae 389 <synaptics_report_mt_data+0x389>
381: 48 89 31 mov %rsi,(%rcx)
384: 4c 89 74 d1 08 mov %r14,0x8(%rcx,%rdx,8)
389: 8b 40 20 mov 0x20(%rax),%eax
38c: 01 c0 add %eax,%eax
38e: 44 8d 04 80 lea (%rax,%rax,4),%r8d
392: 48 8d 74 24 20 lea 0x20(%rsp),%rsi
397: 48 8d 54 24 28 lea 0x28(%rsp),%rdx
39c: 4c 89 e7 mov %r12,%rdi
39f: 44 89 e9 mov %r13d,%ecx
3a2: e8 00 00 00 00 call 3a7 <synaptics_report_mt_data+0x3a7> 3a3: R_X86_64_PLT32 input_mt_assign_slots-0x4
3a7: 49 ff cd dec %r13
3aa: 45 31 ff xor %r15d,%r15d
3ad: eb 04 jmp 3b3 <synaptics_report_mt_data+0x3b3>
3af: 90 nop
3b0: 49 ff c7 inc %r15
3b3: 42 8b 4c bc 20 mov 0x20(%rsp,%r15,4),%ecx
3b8: 4c 89 e7 mov %r12,%rdi
3bb: be 03 00 00 00 mov $0x3,%esi
3c0: ba 2f 00 00 00 mov $0x2f,%edx
3c5: e8 00 00 00 00 call 3ca <synaptics_report_mt_data+0x3ca> 3c6: R_X86_64_PLT32 input_event-0x4
3ca: 4c 89 e7 mov %r12,%rdi
3cd: 31 f6 xor %esi,%esi
3cf: ba 01 00 00 00 mov $0x1,%edx
3d4: e8 00 00 00 00 call 3d9 <synaptics_report_mt_data+0x3d9> 3d5: R_X86_64_PLT32 input_mt_report_slot_state-0x4
3d9: 42 0f bf 4c bc 28 movswl 0x28(%rsp,%r15,4),%ecx
3df: 4c 89 e7 mov %r12,%rdi
3e2: be 03 00 00 00 mov $0x3,%esi
3e7: ba 35 00 00 00 mov $0x35,%edx
3ec: e8 00 00 00 00 call 3f1 <synaptics_report_mt_data+0x3f1> 3ed: R_X86_64_PLT32 input_event-0x4
3f1: 42 0f bf 4c bc 2a movswl 0x2a(%rsp,%r15,4),%ecx
3f7: 4c 89 e7 mov %r12,%rdi
3fa: be 03 00 00 00 mov $0x3,%esi
3ff: ba 36 00 00 00 mov $0x36,%edx
404: e8 00 00 00 00 call 409 <synaptics_report_mt_data+0x409> 405: R_X86_64_PLT32 input_event-0x4
409: 4a 8b 44 fc 30 mov 0x30(%rsp,%r15,8),%rax
40e: 8b 48 08 mov 0x8(%rax),%ecx
411: 4c 89 e7 mov %r12,%rdi
414: be 03 00 00 00 mov $0x3,%esi
419: ba 3a 00 00 00 mov $0x3a,%edx
41e: e8 00 00 00 00 call 423 <synaptics_report_mt_data+0x423> 41f: R_X86_64_PLT32 input_event-0x4
423: 8b 05 00 00 00 00 mov 0x0(%rip),%eax # 429 <synaptics_report_mt_data+0x429> 425: R_X86_64_PC32 __preempt_count-0x4
429: 25 00 01 ff 00 and $0xff0100,%eax
42e: 4d 39 fd cmp %r15,%r13
431: 74 58 je 48b <synaptics_report_mt_data+0x48b>
433: 85 c0 test %eax,%eax
435: 74 18 je 44f <synaptics_report_mt_data+0x44f>
437: 3d 00 01 00 00 cmp $0x100,%eax
43c: 0f 85 6e ff ff ff jne 3b0 <synaptics_report_mt_data+0x3b0>
442: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
449: 0f 84 61 ff ff ff je 3b0 <synaptics_report_mt_data+0x3b0>
44f: 8b 83 88 14 00 00 mov 0x1488(%rbx),%eax
455: 83 f8 02 cmp $0x2,%eax
458: 0f 85 52 ff ff ff jne 3b0 <synaptics_report_mt_data+0x3b0>
45e: 48 8b 83 90 14 00 00 mov 0x1490(%rbx),%rax
465: 48 8b 08 mov (%rax),%rcx
468: 48 8d 51 01 lea 0x1(%rcx),%rdx
46c: 8b b3 8c 14 00 00 mov 0x148c(%rbx),%esi
472: 48 39 f2 cmp %rsi,%rdx
475: 0f 83 35 ff ff ff jae 3b0 <synaptics_report_mt_data+0x3b0>
47b: 48 89 10 mov %rdx,(%rax)
47e: 4c 89 74 c8 08 mov %r14,0x8(%rax,%rcx,8)
483: 49 ff c7 inc %r15
486: e9 28 ff ff ff jmp 3b3 <synaptics_report_mt_data+0x3b3>
48b: 85 c0 test %eax,%eax
48d: 4c 8b 7c 24 10 mov 0x10(%rsp),%r15
492: 74 10 je 4a4 <synaptics_report_mt_data+0x4a4>
494: 3d 00 01 00 00 cmp $0x100,%eax
499: 75 35 jne 4d0 <synaptics_report_mt_data+0x4d0>
49b: 83 bb ac 14 00 00 00 cmpl $0x0,0x14ac(%rbx)
4a2: 74 2c je 4d0 <synaptics_report_mt_data+0x4d0>
4a4: 8b 83 88 14 00 00 mov 0x1488(%rbx),%eax
4aa: 83 f8 02 cmp $0x2,%eax
4ad: 75 21 jne 4d0 <synaptics_report_mt_data+0x4d0>
4af: 48 8b 83 90 14 00 00 mov 0x1490(%rbx),%rax
4b6: 48 8b 08 mov (%rax),%rcx
4b9: 48 8d 51 01 lea 0x1(%rcx),%rdx
4bd: 8b b3 8c 14 00 00 mov 0x148c(%rbx),%esi
4c3: 48 39 f2 cmp %rsi,%rdx
4c6: 73 08 jae 4d0 <synaptics_report_mt_data+0x4d0>
4c8: 48 89 10 mov %rdx,(%rax)
4cb: 4c 89 74 c8 08 mov %r14,0x8(%rax,%rcx,8)
4d0: 4c 89 e7 mov %r12,%rdi
4d3: e8 00 00 00 00 call 4d8 <synaptics_report_mt_data+0x4d8> 4d4: R_X86_64_PLT32 input_mt_drop_unused-0x4
4d8: 4c 89 e7 mov %r12,%rdi
4db: 31 f6 xor %esi,%esi
4dd: e8 00 00 00 00 call 4e2 <synaptics_report_mt_data+0x4e2> 4de: R_X86_64_PLT32 input_mt_report_pointer_emulation-0x4
4e2: 4c 89 e7 mov %r12,%rdi
4e5: 8b 74 24 0c mov 0xc(%rsp),%esi
4e9: e8 00 00 00 00 call 4ee <synaptics_report_mt_data+0x4ee> 4ea: R_X86_64_PLT32 input_mt_report_finger_count-0x4
4ee: 48 8b 7c 24 18 mov 0x18(%rsp),%rdi
4f3: 4c 89 fe mov %r15,%rsi
4f6: e8 00 00 00 00 call 4fb <synaptics_report_mt_data+0x4fb> 4f7: R_X86_64_PLT32 .text.synaptics_report_buttons-0x4
4fb: 4c 89 e7 mov %r12,%rdi
4fe: 31 f6 xor %esi,%esi
500: 31 d2 xor %edx,%edx
502: 31 c9 xor %ecx,%ecx
504: e8 00 00 00 00 call 509 <synaptics_report_mt_data+0x509> 505: R_X86_64_PLT32 input_event-0x4
509: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 510 <synaptics_report_mt_data+0x510> 50c: R_X86_64_PC32 __stack_chk_guard-0x4
510: 48 3b 44 24 40 cmp 0x40(%rsp),%rax
515: 75 25 jne 53c <synaptics_report_mt_data+0x53c>
517: 48 8d 65 d8 lea -0x28(%rbp),%rsp
51b: 5b pop %rbx
51c: 41 5c pop %r12
51e: 41 5d pop %r13
520: 41 5e pop %r14
522: 41 5f pop %r15
524: 5d pop %rbp
525: 31 c0 xor %eax,%eax
527: 31 c9 xor %ecx,%ecx
529: 31 ff xor %edi,%edi
52b: 31 d2 xor %edx,%edx
52d: 31 f6 xor %esi,%esi
52f: 45 31 c0 xor %r8d,%r8d
532: 45 31 c9 xor %r9d,%r9d
535: 45 31 d2 xor %r10d,%r10d
538: 45 31 db xor %r11d,%r11d
53b: c3 ret
53c: e8 00 00 00 00 call 541 <synaptics_report_mt_data+0x541> 53d: R_X86_64_PLT32 __stack_chk_fail-0x4
541: 8b 83 88 14 00 00 mov 0x1488(%rbx),%eax
547: 48 8b 83 90 14 00 00 mov 0x1490(%rbx),%rax
54e: 48 ff 00 incq (%rax)
> Also, if you happen to have CONFIG_DEBUG_INFO enabled, the line number
> of that last branch:
>
> addr2line -fpie vmlinux.o.orig -j .text.synaptics_report_mt_data 0x33e
That configuration does have debug info enabled but...
$ addr2line -fpie vmlinux.o.orig -j .text.synaptics_report_mt_data 0x33e
synaptics_report_mt_data at ld-temp.o:?
Unfortunately, I am not sure how well LTO preserves debug info; IIUC,
debug info in LLVM is best effort, optimizations may or may not update
the info throughout their transformations, especially by the time the
LTO pipeline happens.
Cheers,
Nathan