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authorKyle McMartin <kyle@mcmartin.ca>2009-04-26 23:53:34 -0400
committerKyle McMartin <kyle@ihatethathostname.lab.bos.redhat.com>2009-09-27 23:07:21 -0400
commitd6b58772dc39262629708e5f3c30ef06de290894 (patch)
treebed61d5aea5f655ca86a064f441df2f505e769e9 /arch/parisc/kernel
parent17d857be649a21ca90008c6dc425d849fa83db5c (diff)
parisc: tracehook_report_syscall
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>
Diffstat (limited to 'arch/parisc/kernel')
-rw-r--r--arch/parisc/kernel/ptrace.c23
-rw-r--r--arch/parisc/kernel/syscall.S4
2 files changed, 14 insertions, 13 deletions
diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
index 927db3668b6f..2118ed02e886 100644
--- a/arch/parisc/kernel/ptrace.c
+++ b/arch/parisc/kernel/ptrace.c
@@ -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 */
}
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 59fc1a43ec3e..5698668166cd 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -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)