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parisc: tracehook_report_syscall

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This makes parisc use the standard tracehook_report_syscall_entry
and tracehook_report_syscall_exit hooks in <linux/tracehook.h>.

To do this, we need to access current->thread.regs, and to know
whether we're entering or exiting the syscall, so add this to
syscall_trace.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
This commit is contained in:
Kyle McMartin 2009-04-26 23:53:34 -04:00 committed by Kyle McMartin
parent 17d857be64
commit d6b58772dc
2 changed files with 14 additions and 13 deletions
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23
arch/parisc/kernel/ptrace.c
View File

@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/user.h>
#include <linux/personality.h>
#include <linux/security.h>
@ -264,21 +265,19 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
#endif
void syscall_trace(void)
void syscall_trace(int why)
{
struct pt_regs *regs = &current->thread.regs;
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
if (!(current->ptrace & PT_PTRACED))
return;
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
* Report the system call for tracing. Entry tracing can
* decide to abort the call. We handle that by setting an
* invalid syscall number (-1) to force an ENOSYS error.
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
if (why)
tracehook_report_syscall_exit(regs, 0);
else if (tracehook_report_syscall_entry(regs))
regs->gr[20] = -1; /* force ENOSYS */
}

4
arch/parisc/kernel/syscall.S
View File

@ -288,6 +288,7 @@ tracesys:
STREG %r18,PT_GR18(%r2)
/* Finished saving things for the debugger */
ldi 0,%r26 /* syscall entry */
ldil L%syscall_trace,%r1
ldil L%tracesys_next,%r2
be R%syscall_trace(%sr7,%r1)
@ -336,6 +337,7 @@ tracesys_exit:
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
ldi 1,%r26 /* syscall exit */
bl syscall_trace, %r2
STREG %r28,TASK_PT_GR28(%r1) /* save return value now */
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
@ -358,7 +360,7 @@ tracesys_sigexit:
ldo -16(%r30),%r29 /* Reference param save area */
#endif
bl syscall_trace, %r2
nop
ldi 1,%r26 /* syscall exit */
ldil L%syscall_exit_rfi,%r1
be,n R%syscall_exit_rfi(%sr7,%r1)