From e4aed6cc45f06acd35e3dfbbaf632c5d5aa897c0 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Wed, 30 Jan 2008 13:30:52 +0100 Subject: [PATCH] x86-64 ptrace: use task_pt_regs This cleans up the 64-bit ptrace code to use task_pt_regs instead of its own redundant code that does the same thing a different way. Signed-off-by: Roland McGrath Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/ptrace_64.c | 60 ++++++++----------------------------- 1 file changed, 12 insertions(+), 48 deletions(-) diff --git a/arch/x86/kernel/ptrace_64.c b/arch/x86/kernel/ptrace_64.c index b129b1fbb5..d0a0aeaaa0 100644 --- a/arch/x86/kernel/ptrace_64.c +++ b/arch/x86/kernel/ptrace_64.c @@ -42,44 +42,6 @@ */ #define FLAG_MASK 0x54dd5UL -/* - * eflags and offset of eflags on child stack.. - */ -#define EFLAGS offsetof(struct pt_regs, eflags) -#define EFL_OFFSET ((int)(EFLAGS-sizeof(struct pt_regs))) - -/* - * 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 TSS. - * this routine assumes that all the privileged stacks are in our - * data space. - */ -static inline unsigned long get_stack_long(struct task_struct *task, int offset) -{ - unsigned char *stack; - - stack = (unsigned char *)task->thread.rsp0; - stack += offset; - return (*((unsigned long *)stack)); -} - -/* - * this routine will put a word on the processes privileged stack. - * the offset is how far from the base addr as stored in the TSS. - * this routine assumes that all the privileged stacks are in our - * data space. - */ -static inline long put_stack_long(struct task_struct *task, int offset, - unsigned long data) -{ - unsigned char * stack; - - stack = (unsigned char *) task->thread.rsp0; - stack += offset; - *(unsigned long *) stack = data; - return 0; -} - /* * Called by kernel/ptrace.c when detaching.. * @@ -90,11 +52,16 @@ void ptrace_disable(struct task_struct *child) user_disable_single_step(child); } +static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) +{ + BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); + return ®s->r15 + (offset / sizeof(regs->r15)); +} + static int putreg(struct task_struct *child, unsigned long regno, unsigned long value) { - unsigned long tmp; - + struct pt_regs *regs = task_pt_regs(child); switch (regno) { case offsetof(struct user_regs_struct,fs): if (value && (value & 3) != 3) @@ -152,9 +119,7 @@ static int putreg(struct task_struct *child, clear_tsk_thread_flag(child, TIF_FORCED_TF); else if (test_tsk_thread_flag(child, TIF_FORCED_TF)) value |= X86_EFLAGS_TF; - tmp = get_stack_long(child, EFL_OFFSET); - tmp &= ~FLAG_MASK; - value |= tmp; + value |= regs->eflags & ~FLAG_MASK; break; case offsetof(struct user_regs_struct,cs): if ((value & 3) != 3) @@ -162,12 +127,13 @@ static int putreg(struct task_struct *child, value &= 0xffff; break; } - put_stack_long(child, regno - sizeof(struct pt_regs), value); + *pt_regs_access(regs, regno) = value; return 0; } static unsigned long getreg(struct task_struct *child, unsigned long regno) { + struct pt_regs *regs = task_pt_regs(child); unsigned long val; switch (regno) { case offsetof(struct user_regs_struct, fs): @@ -202,16 +168,14 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno) /* * If the debugger set TF, hide it from the readout. */ - regno = regno - sizeof(struct pt_regs); - val = get_stack_long(child, regno); + val = regs->eflags; if (test_tsk_thread_flag(child, TIF_IA32)) val &= 0xffffffff; if (test_tsk_thread_flag(child, TIF_FORCED_TF)) val &= ~X86_EFLAGS_TF; return val; default: - regno = regno - sizeof(struct pt_regs); - val = get_stack_long(child, regno); + val = *pt_regs_access(regs, regno); if (test_tsk_thread_flag(child, TIF_IA32)) val &= 0xffffffff; return val; -- 2.39.5