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sparc64: tracehook syscall

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This changes sparc64 syscall tracing to use the new tracehook.h entry
points.

[ Add assembly changes to force an immediate -ENOSYS return from
  the system call when syscall_trace() returns non-zero at syscall
  entry.  -DaveM ]

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roland McGrath 2008-07-27 00:30:50 -07:00 committed by David S. Miller
parent 5cfc177666
commit 73ccefab8a
3 changed files with 17 additions and 22 deletions
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3
arch/sparc64/kernel/entry.h
View File

@ -22,8 +22,7 @@ extern void do_notify_resume(struct pt_regs *regs,
unsigned long orig_i0,
unsigned long thread_info_flags);
extern asmlinkage void syscall_trace(struct pt_regs *regs,
int syscall_exit_p);
extern asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p);
extern void bad_trap_tl1(struct pt_regs *regs, long lvl);

32
arch/sparc64/kernel/ptrace.c
View File

@ -23,6 +23,7 @@
#include <linux/audit.h>
#include <linux/signal.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/compat.h>
#include <linux/elf.h>
@ -1049,8 +1050,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
return ret;
}
asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
{
int ret = 0;
/* do the secure computing check first */
secure_computing(regs->u_regs[UREG_G1]);
@ -1064,27 +1067,14 @@ asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
audit_syscall_exit(result, regs->u_regs[UREG_I0]);
}
if (!(current->ptrace & PT_PTRACED))
goto out;
if (!test_thread_flag(TIF_SYSCALL_TRACE))
goto out;
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
/*
* 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;
if (test_thread_flag(TIF_SYSCALL_TRACE)) {
if (syscall_exit_p)
tracehook_report_syscall_exit(regs, 0);
else
ret = tracehook_report_syscall_entry(regs);
}
out:
if (unlikely(current->audit_context) && !syscall_exit_p)
if (unlikely(current->audit_context) && !syscall_exit_p && !ret)
audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
AUDIT_ARCH_SPARC :
AUDIT_ARCH_SPARC64),
@ -1093,4 +1083,6 @@ out:
regs->u_regs[UREG_I1],
regs->u_regs[UREG_I2],
regs->u_regs[UREG_I3]);
return ret;
}

4
arch/sparc64/kernel/syscalls.S
View File

@ -162,6 +162,8 @@ linux_syscall_trace32:
add %sp, PTREGS_OFF, %o0
call syscall_trace
clr %o1
brnz,pn %o0, 3f
mov -ENOSYS, %o0
srl %i0, 0, %o0
srl %i4, 0, %o4
srl %i1, 0, %o1
@ -173,6 +175,8 @@ linux_syscall_trace:
add %sp, PTREGS_OFF, %o0
call syscall_trace
clr %o1
brnz,pn %o0, 3f
mov -ENOSYS, %o0
mov %i0, %o0
mov %i1, %o1
mov %i2, %o2