Messages in this thread Patch in this message | | | From | Roland McGrath <> | Subject | [PATCH x86/mm 6/6] x86-64 ia32 ptrace get/putreg32 current task | Date | Wed, 28 Nov 2007 16:42:22 -0800 (PST) |
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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 <roland@redhat.com> --- arch/x86/ia32/ptrace32.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c index c52d066..d5663e2 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); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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