um: userspace - be more verbose in ptrace set regs error

When ptrace fails to set GP/FP regs for the target process,
log the error before crashing the UML kernel.

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 8 insertions, 2 deletions

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 03b3c4cc7735..31c9be2c2bdd 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -323,11 +323,17 @@ void userspace(struct uml_pt_regs *regs)
                  * fail.  In this case, there is nothing to do but
                  * just kill the process.
                  */
-                if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp))
+                if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp)) {
+                        printk(UM_KERN_ERR "userspace - ptrace set regs "
+                               "failed, errno = %d\n", errno);
                         fatal_sigsegv();
+                }
 
-                if (put_fp_registers(pid, regs->fp))
+                if (put_fp_registers(pid, regs->fp)) {
+                        printk(UM_KERN_ERR "userspace - ptrace set fp regs "
+                               "failed, errno = %d\n", errno);
                         fatal_sigsegv();
+                }
 
                 /* Now we set local_using_sysemu to be used for one loop */
                 local_using_sysemu = get_using_sysemu();