From: Al Viro Signed-off-by: Al Viro Signed-off-by: Andrew Morton --- arch/arm26/kernel/process.c | 3 +-- arch/arm26/kernel/ptrace.c | 25 +++++-------------------- include/asm-arm26/thread_info.h | 2 +- 3 files changed, 7 insertions(+), 23 deletions(-) diff -puN arch/arm26/kernel/process.c~arm26-task_pt_regs arch/arm26/kernel/process.c --- devel/arch/arm26/kernel/process.c~arm26-task_pt_regs 2006-01-04 22:02:47.000000000 -0800 +++ devel-akpm/arch/arm26/kernel/process.c 2006-01-04 22:02:47.000000000 -0800 @@ -278,9 +278,8 @@ copy_thread(int nr, unsigned long clone_ unsigned long unused, struct task_struct *p, struct pt_regs *regs) { struct thread_info *thread = task_thread_info(p); - struct pt_regs *childregs; + struct pt_regs *childregs = task_pt_regs(p); - childregs = __get_user_regs(thread); *childregs = *regs; childregs->ARM_r0 = 0; childregs->ARM_sp = stack_start; diff -puN arch/arm26/kernel/ptrace.c~arm26-task_pt_regs arch/arm26/kernel/ptrace.c --- devel/arch/arm26/kernel/ptrace.c~arm26-task_pt_regs 2006-01-04 22:02:47.000000000 -0800 +++ devel-akpm/arch/arm26/kernel/ptrace.c 2006-01-04 22:02:47.000000000 -0800 @@ -40,21 +40,6 @@ #define BREAKINST_ARM 0xef9f0001 /* - * Get the address of the live pt_regs for the specified task. - * These are saved onto the top kernel stack when the process - * is not running. - * - * Note: if a user thread is execve'd from kernel space, the - * kernel stack will not be empty on entry to the kernel, so - * ptracing these tasks will fail. - */ -static inline struct pt_regs * -get_user_regs(struct task_struct *task) -{ - return __get_user_regs(task->thread_info); -} - -/* * this routine will get a word off of the processes privileged stack. * the offset is how far from the base addr as stored in the THREAD. * this routine assumes that all the privileged stacks are in our @@ -62,7 +47,7 @@ get_user_regs(struct task_struct *task) */ static inline long get_user_reg(struct task_struct *task, int offset) { - return get_user_regs(task)->uregs[offset]; + return task_pt_regs(task)->uregs[offset]; } /* @@ -74,7 +59,7 @@ static inline long get_user_reg(struct t static inline int put_user_reg(struct task_struct *task, int offset, long data) { - struct pt_regs newregs, *regs = get_user_regs(task); + struct pt_regs newregs, *regs = task_pt_regs(task); int ret = -EINVAL; newregs = *regs; @@ -377,7 +362,7 @@ void ptrace_set_bpt(struct task_struct * u32 insn; int res; - regs = get_user_regs(child); + regs = task_pt_regs(child); pc = instruction_pointer(regs); res = read_instr(child, pc, &insn); @@ -500,7 +485,7 @@ static int ptrace_write_user(struct task */ static int ptrace_getregs(struct task_struct *tsk, void *uregs) { - struct pt_regs *regs = get_user_regs(tsk); + struct pt_regs *regs = task_pt_regs(tsk); return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0; } @@ -515,7 +500,7 @@ static int ptrace_setregs(struct task_st ret = -EFAULT; if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) { - struct pt_regs *regs = get_user_regs(tsk); + struct pt_regs *regs = task_pt_regs(tsk); ret = -EINVAL; if (valid_user_regs(&newregs)) { diff -puN include/asm-arm26/thread_info.h~arm26-task_pt_regs include/asm-arm26/thread_info.h --- devel/include/asm-arm26/thread_info.h~arm26-task_pt_regs 2006-01-04 22:02:47.000000000 -0800 +++ devel-akpm/include/asm-arm26/thread_info.h 2006-01-04 22:02:47.000000000 -0800 @@ -82,7 +82,7 @@ static inline struct thread_info *curren /* FIXME - PAGE_SIZE < 32K */ #define THREAD_SIZE (8*32768) // FIXME - this needs attention (see kernel/fork.c which gets a nice div by zero if this is lower than 8*32768 -#define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1) +#define task_pt_regs(task) ((struct pt_regs *)((unsigned long)(task)->thread_info + THREAD_SIZE - 8) - 1) extern struct thread_info *alloc_thread_info(struct task_struct *task); extern void free_thread_info(struct thread_info *); _