https://bugs.kde.org/show_bug.cgi?id=511304
Bug ID: 511304
Summary: instruction decoding misaligned
Classification: Developer tools
Product: valgrind
Version First 3.23.0
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: vex
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
the instruction boundary used by valgrind is offset for even the first
instruction of the main. without valgrind, the application runs fine (well,
except for a memory leak that i'm trying to debug ;-)
STEPS TO REPRODUCE
1. start valgrind for any application using musl libc on mips
OBSERVED RESULT
valgrind crashes because it tries to use the invalid instruction encodings at a
wrong boundary. so far, the only offset i've encountered is: <main> + 1.
EXPECTED RESULT
normal operation of valgrind
SOFTWARE/OS VERSIONS
Openwrt (commit f5fd7ef8886)
these patches are applied:
https://github.com/openwrt/openwrt/tree/1a55d90320c169e1e45faa88e5ade69f85af1c9c/package/devel/valgrind/patches
ADDITIONAL INFORMATION
valgrind /bin/busybox:
vex mips->IR: unhandled instruction bytes: 0xF8 0x1A 0x20 0x2A
==24440== valgrind: Unrecognised instruction at address 0x40985d.
0040985c <main>:
40985c: 64f8 save 64,ra,s0-s1
40985e: 1a20 2acc jal 44ab30 <__errno_location@mips16plt>
homegrown application:
vex mips->IR: unhandled instruction bytes: 0xF9 0x67 0x7F 0xD3
==23528== valgrind: Unrecognised instruction at address 0x4049a1.
004049a0 <main>:
4049a0: 63f9 addiu sp,-56
int main(void)
{
4049a2: 677f move v1,ra
4049a4: d30d sw v1,52(sp)
4049a6: d10c sw s1,48(sp)
4049a8: 0106 addiu s1,sp,24
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