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-rw-r--r--arch/powerpc/kernel/ptrace.c64
1 files changed, 30 insertions, 34 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index a5d0e78779c8..3635be61f899 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -22,6 +22,7 @@
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
+#include <linux/tracehook.h>
#include <linux/elf.h>
#include <linux/user.h>
#include <linux/security.h>
@@ -374,7 +375,7 @@ static int vsr_get(struct task_struct *target, const struct user_regset *regset,
flush_vsx_to_thread(target);
for (i = 0; i < 32 ; i++)
- buf[i] = current->thread.fpr[i][TS_VSRLOWOFFSET];
+ buf[i] = target->thread.fpr[i][TS_VSRLOWOFFSET];
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
buf, 0, 32 * sizeof(double));
@@ -393,7 +394,7 @@ static int vsr_set(struct task_struct *target, const struct user_regset *regset,
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
buf, 0, 32 * sizeof(double));
for (i = 0; i < 32 ; i++)
- current->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
+ target->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
return ret;
@@ -717,7 +718,7 @@ void user_disable_single_step(struct task_struct *task)
struct pt_regs *regs = task->thread.regs;
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
/* If DAC then do not single step, skip */
if (task->thread.dabr)
return;
@@ -744,10 +745,11 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
if (addr > 0)
return -EINVAL;
+ /* The bottom 3 bits in dabr are flags */
if ((data & ~0x7UL) >= TASK_SIZE)
return -EIO;
-#ifdef CONFIG_PPC64
+#ifndef CONFIG_BOOKE
/* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
* It was assumed, on previous implementations, that 3 bits were
@@ -769,7 +771,7 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
task->thread.dabr = data;
#endif
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
/* As described above, it was assumed 3 bits were passed with the data
* address, but we will assume only the mode bits will be passed
@@ -973,15 +975,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
case PTRACE_GETVSRREGS:
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_VSX,
- 0, (32 * sizeof(vector128) +
- sizeof(u32)),
+ 0, 32 * sizeof(double),
(void __user *) data);
case PTRACE_SETVSRREGS:
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_VSX,
- 0, (32 * sizeof(vector128) +
- sizeof(u32)),
+ 0, 32 * sizeof(double),
(const void __user *) data);
#endif
#ifdef CONFIG_SPE
@@ -1013,31 +1013,24 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
return ret;
}
-static void do_syscall_trace(void)
+/*
+ * We must return the syscall number to actually look up in the table.
+ * This can be -1L to skip running any syscall at all.
+ */
+long do_syscall_trace_enter(struct pt_regs *regs)
{
- /* the 0x80 provides a way for the tracing parent to distinguish
- between a syscall stop and SIGTRAP delivery */
- 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;
- }
-}
+ long ret = 0;
-void do_syscall_trace_enter(struct pt_regs *regs)
-{
secure_computing(regs->gpr[0]);
- if (test_thread_flag(TIF_SYSCALL_TRACE)
- && (current->ptrace & PT_PTRACED))
- do_syscall_trace();
+ if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+ tracehook_report_syscall_entry(regs))
+ /*
+ * Tracing decided this syscall should not happen.
+ * We'll return a bogus call number to get an ENOSYS
+ * error, but leave the original number in regs->gpr[0].
+ */
+ ret = -1L;
if (unlikely(current->audit_context)) {
#ifdef CONFIG_PPC64
@@ -1055,16 +1048,19 @@ void do_syscall_trace_enter(struct pt_regs *regs)
regs->gpr[5] & 0xffffffff,
regs->gpr[6] & 0xffffffff);
}
+
+ return ret ?: regs->gpr[0];
}
void do_syscall_trace_leave(struct pt_regs *regs)
{
+ int step;
+
if (unlikely(current->audit_context))
audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
regs->result);
- if ((test_thread_flag(TIF_SYSCALL_TRACE)
- || test_thread_flag(TIF_SINGLESTEP))
- && (current->ptrace & PT_PTRACED))
- do_syscall_trace();
+ step = test_thread_flag(TIF_SINGLESTEP);
+ if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, step);
}