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authorRoland McGrath <roland@redhat.com>2008-07-27 00:30:50 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-27 17:28:55 -0700
commit73ccefab8a6590bb3d5b44c046010139108ab7ca (patch)
tree76b9ebc1fb2bc80b4d01d95a232220ac0012972b /arch/sparc64
parent5cfc17766685c79d1a348bce24af9c9dbc0d8d67 (diff)
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sparc64: tracehook syscall
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>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/kernel/entry.h3
-rw-r--r--arch/sparc64/kernel/ptrace.c32
-rw-r--r--arch/sparc64/kernel/syscalls.S4
3 files changed, 17 insertions, 22 deletions
diff --git a/arch/sparc64/kernel/entry.h b/arch/sparc64/kernel/entry.h
index 32fbab6..fc294a2 100644
--- a/arch/sparc64/kernel/entry.h
+++ b/arch/sparc64/kernel/entry.h
@@ -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);
diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index f6c9fc9..bd578cc 100644
--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/kernel/ptrace.c
@@ -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;
}
diff --git a/arch/sparc64/kernel/syscalls.S b/arch/sparc64/kernel/syscalls.S
index db19ed6..a2f2427 100644
--- a/arch/sparc64/kernel/syscalls.S
+++ b/arch/sparc64/kernel/syscalls.S
@@ -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