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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-11-27 11:05:55 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-11-27 11:06:56 +0100
commit59da21398e680e8100625d689c8bebee6a139e93 (patch)
tree7d93f87d2942dac06367af8b3a269e9f6d557b29 /arch/s390/kernel/ptrace.c
parented313489badef16d700f5a3be50e8fd8f8294bc8 (diff)
[S390] fix system call parameter functions.
syscall_get_nr() currently returns a valid result only if the call chain of the traced process includes do_syscall_trace_enter(). But collect_syscall() can be called for any sleeping task, the result of syscall_get_nr() in general is completely bogus. To make syscall_get_nr() work for any sleeping task the traps field in pt_regs is replace with svcnr - the system call number the process is executing. If svcnr == 0 the process is not on a system call path. The syscall_get_arguments and syscall_set_arguments use regs->gprs[2] for the first system call parameter. This is incorrect since gprs[2] may have been overwritten with the system call number if the call chain includes do_syscall_trace_enter. Use regs->orig_gprs2 instead. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/ptrace.c')
-rw-r--r--arch/s390/kernel/ptrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 1f31be1ecc4..38ff2bce120 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -657,7 +657,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
* debugger stored an invalid system call number. Skip
* the system call and the system call restart handling.
*/
- regs->trap = -1;
+ regs->svcnr = 0;
ret = -1;
}