https://llvm.org/bugs/show_bug.cgi?id=26632
Bug ID: 26632
Summary: Breakpoint opcode triggering SIGBUS on Nexus 6
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: e...@codeplay.com
CC: llvm-b...@lists.llvm.org, tbergham...@google.com
Classification: Unclassified
Created attachment 15910
--> https://llvm.org/bugs/attachment.cgi?id=15910&action=edit
Source and arm binaries
r260367(http://reviews.llvm.org/D16853) which changed the arm breakpoint
opcodes introduced a bug on Nexus 6 Armv7.
Whenever a breakpoint is hit it triggers a SIGBUS, seen when compiling with
both thumb and 32 bit.
Reverting the commit removes this problem. Note, need to rebuild lldb-server.
Contrived example attached, building source file fact.c using NDK r10e with the
following command lines.
~/Google/arm32_android-toolchain/bin/arm-linux-androideabi-gcc-4.9 fact.c -O0
-marm -fPIE -pie -o fact_32bit.out
~/Google/arm32_android-toolchain/bin/arm-linux-androideabi-gcc-4.9 fact.c -O0
-mthumb -fPIE -pie -o fact_thumb.out
On device
./lldb-server g 127.0.0.1:1234 fact_thumb.out
On host
(lldb) target create ~/Desktop/Scratch/android/fact_thumb.out
Current executable set to '~/Desktop/Scratch/android/fact_thumb.out' (arm).
(lldb) gdb-remote localhost:1234
Process 5109 stopped
* thread #1: tid = 5109, 0xb6f6af88, name = 'fact_thumb.out', stop reason =
signal SIGSTOP
frame #0: 0xb6f6af88
-> 0xb6f6af88: mov r0, sp
0xb6f6af8c: blx 0xb6f71304
0xb6f6af90: mov pc, r0
0xb6f6af94: addlt r11, r4, r0, lsl r5
(lldb) b main
Breakpoint 1: where = fact_thumb.out`main, address = 0xb6fb3370
(lldb) c
Process 5109 resuming
Process 5109 stopped
* thread #1: tid = 5109, 0xb6fb32a0 fact_thumb.out`_start, name =
'fact_thumb.out', stop reason = signal SIGBUS
frame #0: 0xb6fb32a0 fact_thumb.out`_start
fact_thumb.out`_start:
-> 0xb6fb32a0 <+0>: ldr r12, [pc, #0x5c]
0xb6fb32a4 <+4>: push {r11, lr}
0xb6fb32a8 <+8>: ldr r2, [pc, #0x58]
0xb6fb32ac <+12>: add r11, sp, #4
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