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[S390] ptrace changes

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* System call parameter and result access functions
* Add tracehook calls
* Split syscall_trace into two functions do_syscall_trace_enter and
  do_syscall_trace_exit

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2008-10-10 21:33:20 +02:00
parent d86730bb95
commit 753c4dd6a2
8 changed files with 202 additions and 48 deletions
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61
arch/s390/kernel/ptrace.c
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@@ -35,6 +35,7 @@
#include <linux/signal.h>
#include <linux/elf.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <asm/segment.h>
#include <asm/page.h>
@@ -639,40 +640,44 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
}
#endif
asmlinkage void
syscall_trace(struct pt_regs *regs, int entryexit)
asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
{
if (unlikely(current->audit_context) && entryexit)
audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]);
if (!test_thread_flag(TIF_SYSCALL_TRACE))
goto out;
if (!(current->ptrace & PT_PTRACED))
goto out;
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
long ret;
/*
* If the debuffer has set an invalid system call number,
* we prepare to skip the system call restart handling.
* The sysc_tracesys code in entry.S stored the system
* call number to gprs[2].
*/
if (!entryexit && regs->gprs[2] >= NR_syscalls)
ret = regs->gprs[2];
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
(tracehook_report_syscall_entry(regs) ||
regs->gprs[2] >= NR_syscalls)) {
/*
* Tracing decided this syscall should not happen or the
* debugger stored an invalid system call number. Skip
* the system call and the system call restart handling.
*/
regs->trap = -1;
/*
* this isn't the same as continuing with a signal, but it will do
* for normal use. strace only continues with a signal if the
* stopping signal is not SIGTRAP. -brl
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
ret = -1;
}
out:
if (unlikely(current->audit_context) && !entryexit)
audit_syscall_entry(test_thread_flag(TIF_31BIT)?AUDIT_ARCH_S390:AUDIT_ARCH_S390X,
regs->gprs[2], regs->orig_gpr2, regs->gprs[3],
regs->gprs[4], regs->gprs[5]);
if (unlikely(current->audit_context))
audit_syscall_entry(test_thread_flag(TIF_31BIT) ?
AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
regs->gprs[2], regs->orig_gpr2,
regs->gprs[3], regs->gprs[4],
regs->gprs[5]);
return ret;
}
asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
{
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]),
regs->gprs[2]);
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, 0);
}
/*