[PATCH] sparc: Fix PTRACE_CONT bogosity

SunOS aparently had this weird PTRACE_CONT semantic which
we copied.  If the addr argument is something other than
1, it sets the process program counter to whatever that
value is.

This is different from every other Linux architecture, which
don't do anything with the addr and data args.

This difference in particular breaks the Linux native GDB support
for fork and vfork tracing on sparc and sparc64.

There is no interest in running SunOS binaries using this weird
PTRACE_CONT behavior, so just delete it so we behave like other
platforms do.

From: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/sparc/kernel/ptrace.c b/arch/sparc/kernel/ptrace.c
index 9cd81b47f0ee66392a5bcb232103006f078277e5..08c549120c7b734d4ed2b2dc62864aeb99351190 100644 (file)
--- a/arch/sparc/kernel/ptrace.c
+++ b/arch/sparc/kernel/ptrace.c
@@ -531,18 +531,6 @@ asmlinkage void do_ptrace(struct pt_regs *regs)
                        pt_error_return(regs, EIO);
                        goto out_tsk;
                }
-               if (addr != 1) {
-                       if (addr & 3) {
-                               pt_error_return(regs, EINVAL);
-                               goto out_tsk;
-                       }
-#ifdef DEBUG_PTRACE
-                       printk ("Original: %08lx %08lx\n", child->thread.kregs->pc, child->thread.kregs->npc);
-                       printk ("Continuing with %08lx %08lx\n", addr, addr+4);
-#endif
-                       child->thread.kregs->pc = addr;
-                       child->thread.kregs->npc = addr + 4;
-               }
 
                if (request == PTRACE_SYSCALL)
                        set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index 1722dc51b0d8f5c1732eabaae7637d7b1adc2d76..08bac537262acb9b2ee0ef395996fac482dc8226 100644 (file)
--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/kernel/ptrace.c
@@ -514,25 +514,6 @@ asmlinkage void do_ptrace(struct pt_regs *regs)
                        pt_error_return(regs, EIO);
                        goto out_tsk;
                }
-               if (addr != 1) {
-                       unsigned long pc_mask = ~0UL;
-
-                       if ((child->thread_info->flags & _TIF_32BIT) != 0)
-                               pc_mask = 0xffffffff;
-
-                       if (addr & 3) {
-                               pt_error_return(regs, EINVAL);
-                               goto out_tsk;
-                       }
-#ifdef DEBUG_PTRACE
-                       printk ("Original: %016lx %016lx\n",
-                               child->thread_info->kregs->tpc,
-                               child->thread_info->kregs->tnpc);
-                       printk ("Continuing with %016lx %016lx\n", addr, addr+4);
-#endif
-                       child->thread_info->kregs->tpc = (addr & pc_mask);
-                       child->thread_info->kregs->tnpc = ((addr + 4) & pc_mask);
-               }
 
                if (request == PTRACE_SYSCALL) {
                        set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);