Commit 73ccefab authored by Roland McGrath's avatar Roland McGrath Committed by David S. Miller
Browse files

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: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5cfc1776

arch/sparc64/kernel/entry.h

+1 −2
Original line number Diff line number Diff line
@@ -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);

arch/sparc64/kernel/ptrace.c

+12 −20
Original line number Diff line number Diff line
@@ -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;

}

arch/sparc64/kernel/syscalls.S

+4 −0
Original line number Diff line number Diff line
@@ -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

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