niansa-misc/musl
1
0
Fork 0
mirror of git://git.musl-libc.org/musl synced 2025-03-06 20:48:29 +01:00
Code Issues Projects Releases Packages Wiki Activity

s390x: manually inline __tls_get_addr in __tls_get_offset

Browse source 
Calling __tls_get_addr with brasl is not valid since it's a global symbol; doing
so results in an R_390_PC32DBL relocation error from lld. We could fix this by
marking __tls_get_addr hidden since it is not part of the s390x ABI, or by using
a different instruction. However, given its simplicity, it makes more sense to
just manually inline it into __tls_get_offset for performance.

The patch has been tested by applying to Zig's bundled musl copy and running the
full Zig test suite under qemu-s390x.
This commit is contained in:
Alex Rønne Petersen 2025-01-24 06:12:13 +01:00 • committed by Rich Felker
parent 5ccf05d86d
commit 6af4f25b89
1 changed files with 10 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
src/thread/s390x/__tls_get_offset.s
View file

@ -1,17 +1,17 @@
.global __tls_get_offset
.type __tls_get_offset,%function
__tls_get_offset:
stmg %r14, %r15, 112(%r15)
aghi %r15, -160
ear %r0, %a0
sllg %r0, %r0, 32
ear %r0, %a1
la %r2, 0(%r2, %r12)
brasl %r14, __tls_get_addr
la %r1, 0(%r2, %r12)
ear %r1, %a0
sllg %r1, %r1, 32
ear %r1, %a1
lg %r3, 0(%r1)
sllg %r4, %r3, 3
lg %r5, 8(%r0)
lg %r2, 0(%r4, %r5)
ag %r2, 8(%r1)
sgr %r2, %r0
sgr %r2, %r1
lmg %r14, %r15, 272(%r15)
br %r14