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| author | Stefan Liebler <stli@linux.ibm.com> | 2022-08-25 12:17:48 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2022-08-30 10:54:46 +0200 |
| commit | e57d8fc97b90127de4ed3e3a9cdf663667580935 (patch) | |
| tree | f6b33a78454ea861ddef36b3ed8eb28289094f28 /sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h | |
| parent | 1d495912a746e2a1ffb780c9a81fd234ec2464e8 (diff) | |
| download | glibc-e57d8fc97b90127de4ed3e3a9cdf663667580935.tar.gz glibc-e57d8fc97b90127de4ed3e3a9cdf663667580935.tar.xz glibc-e57d8fc97b90127de4ed3e3a9cdf663667580935.zip | |
S390: Always use svc 0
On s390x syscalls are triggered by svc instruction. One can pass the syscall number encoded in the instruction "svc 123" or by storing it in r1: lghi r1,123 svc 0 If the syscall number is encoded in the instruction, this can cause broken syscall restarts. Therefore this patch is now just passing the syscall number in r1. See also kernel-commit: "s390/signal: switch to using vdso for sigreturn and syscall restart" https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/s390/[%e2%80%a6]call.c?h=v6.0-rc1&id=df29a7440c4b5c65765c8f60396b3b13063e24e9 As information, the "svc 0" feature was introduced in kernel 2.5.62: commit b5aad611393ef2e132e3648fa4c6e56a9cfa8708
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h index 967949f231..e41106b377 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h +++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h @@ -155,12 +155,8 @@ lr %r0,%r7; \ l %r7,96(%r15); \ .endif; \ - .if SYS_ify (syscall) < 256; \ - svc SYS_ify (syscall); \ - .else; \ lhi %r1,SYS_ify (syscall); \ svc 0; \ - .endif; \ .if args > 5; \ lr %r7,%r0; \ .endif |