diff options
| author | Heiko Carstens <[email protected]> | 2021-06-21 16:03:56 +0200 |
|---|---|---|
| committer | Christian Borntraeger <[email protected]> | 2021-06-23 09:22:37 +0200 |
| commit | 4fa3b91bdee1b08348c82660668ca0ca34e271ad (patch) | |
| tree | dc74fbdbfb85094d0067e8f7f0939c29507a2703 | |
| parent | 6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff) | |
KVM: s390: get rid of register asm usage
Using register asm statements has been proven to be very error prone,
especially when using code instrumentation where gcc may add function
calls, which clobbers register contents in an unexpected way.
Therefore get rid of register asm statements in kvm code, even though
there is currently nothing wrong with them. This way we know for sure
that this bug class won't be introduced here.
Signed-off-by: Heiko Carstens <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Reviewed-by: Claudio Imbrenda <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: checkpatch strict fix]
Signed-off-by: Christian Borntraeger <[email protected]>
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 1296fc10f80c..876fc1f7282a 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -329,31 +329,31 @@ static void allow_cpu_feat(unsigned long nr) static inline int plo_test_bit(unsigned char nr) { - register unsigned long r0 asm("0") = (unsigned long) nr | 0x100; + unsigned long function = (unsigned long)nr | 0x100; int cc; asm volatile( + " lgr 0,%[function]\n" /* Parameter registers are ignored for "test bit" */ " plo 0,0,0,0(0)\n" " ipm %0\n" " srl %0,28\n" : "=d" (cc) - : "d" (r0) - : "cc"); + : [function] "d" (function) + : "cc", "0"); return cc == 0; } static __always_inline void __insn32_query(unsigned int opcode, u8 *query) { - register unsigned long r0 asm("0") = 0; /* query function */ - register unsigned long r1 asm("1") = (unsigned long) query; - asm volatile( - /* Parameter regs are ignored */ + " lghi 0,0\n" + " lgr 1,%[query]\n" + /* Parameter registers are ignored */ " .insn rrf,%[opc] << 16,2,4,6,0\n" : - : "d" (r0), "a" (r1), [opc] "i" (opcode) - : "cc", "memory"); + : [query] "d" ((unsigned long)query), [opc] "i" (opcode) + : "cc", "memory", "0", "1"); } #define INSN_SORTL 0xb938 |