From d277fb89dfb042deba04a8e765718cc8b3825e85 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Wed, 30 Jan 2008 13:30:58 +0100 Subject: [PATCH] x86: x86-64 ia32 ptrace get/putreg32 current task This generalizes the getreg32 and putreg32 functions so they can be used on the current task, as well as on a task stopped in TASK_TRACED and switched off. This lays the groundwork to share this code for all kinds of user-mode machine state access, not just ptrace. Signed-off-by: Roland McGrath Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/ia32/ptrace32.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c index c52d0664c67f..d5663e295330 100644 --- a/arch/x86/ia32/ptrace32.c +++ b/arch/x86/ia32/ptrace32.c @@ -48,19 +48,27 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val) if (val && (val & 3) != 3) return -EIO; child->thread.fsindex = val & 0xffff; + if (child == current) + loadsegment(fs, child->thread.fsindex); break; case offsetof(struct user32, regs.gs): if (val && (val & 3) != 3) return -EIO; child->thread.gsindex = val & 0xffff; + if (child == current) + load_gs_index(child->thread.gsindex); break; case offsetof(struct user32, regs.ds): if (val && (val & 3) != 3) return -EIO; child->thread.ds = val & 0xffff; + if (child == current) + loadsegment(ds, child->thread.ds); break; case offsetof(struct user32, regs.es): child->thread.es = val & 0xffff; + if (child == current) + loadsegment(es, child->thread.ds); break; case offsetof(struct user32, regs.ss): if ((val & 3) != 3) @@ -129,15 +137,23 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val) switch (regno) { case offsetof(struct user32, regs.fs): *val = child->thread.fsindex; + if (child == current) + asm("movl %%fs,%0" : "=r" (*val)); break; case offsetof(struct user32, regs.gs): *val = child->thread.gsindex; + if (child == current) + asm("movl %%gs,%0" : "=r" (*val)); break; case offsetof(struct user32, regs.ds): *val = child->thread.ds; + if (child == current) + asm("movl %%ds,%0" : "=r" (*val)); break; case offsetof(struct user32, regs.es): *val = child->thread.es; + if (child == current) + asm("movl %%es,%0" : "=r" (*val)); break; R32(cs, cs); -- 2.30.2