diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-16 12:06:34 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-01 00:44:44 -0400 |
| commit | d878d6dacee2c862f02da20f7fa3e2c0e8820e71 (patch) | |
| tree | c594e7cc3d49e2af55f6fe9706a2fc618dc3f150 /arch/m68k/include/asm/ptrace.h | |
| parent | 533e6903bea0440816a0f517b0845ccea4cc7917 (diff) | |
m68k: switch to generic sys_execve()/kernel_execve()
The tricky part here is that task_pt_regs() on m68k works *only* for
process inside do_signal(). However, we need something much simpler -
pt_regs of a process inside do_signal() may be at different offsets
from the stack bottom, depending on the way we'd entered the kernel,
but for a task inside sys_execve() it *is* at constant offset.
Moreover, for a kernel thread about to become a userland process the
same location is also fine - setting sp to that will leave the kernel
stack pointer at the very bottom of the kernel stack when we finally
switch to userland.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/m68k/include/asm/ptrace.h')
| -rw-r--r-- | arch/m68k/include/asm/ptrace.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/ptrace.h b/arch/m68k/include/asm/ptrace.h index 65322b17b6cf..5e08b597f012 100644 --- a/arch/m68k/include/asm/ptrace.h +++ b/arch/m68k/include/asm/ptrace.h @@ -85,6 +85,8 @@ struct switch_stack { #define user_mode(regs) (!((regs)->sr & PS_S)) #define instruction_pointer(regs) ((regs)->pc) #define profile_pc(regs) instruction_pointer(regs) +#define current_pt_regs() \ + (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1 #define arch_has_single_step() (1) |