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x86: x86-64 ptrace get/putreg current task

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This generalizes the getreg and putreg 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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:58 +01:00 committed by Ingo Molnar
parent 9e714bed64
commit ce90f34085
1 changed files with 34 additions and 2 deletions
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36
arch/x86/kernel/ptrace_64.c
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@ -67,21 +67,29 @@ static int putreg(struct task_struct *child,
if (value && (value & 3) != 3)
return -EIO;
child->thread.fsindex = value & 0xffff;
if (child == current)
loadsegment(fs, child->thread.fsindex);
return 0;
case offsetof(struct user_regs_struct,gs):
if (value && (value & 3) != 3)
return -EIO;
child->thread.gsindex = value & 0xffff;
if (child == current)
load_gs_index(child->thread.gsindex);
return 0;
case offsetof(struct user_regs_struct,ds):
if (value && (value & 3) != 3)
return -EIO;
child->thread.ds = value & 0xffff;
if (child == current)
loadsegment(ds, child->thread.ds);
return 0;
case offsetof(struct user_regs_struct,es):
if (value && (value & 3) != 3)
return -EIO;
child->thread.es = value & 0xffff;
if (child == current)
loadsegment(es, child->thread.es);
return 0;
case offsetof(struct user_regs_struct,ss):
if ((value & 3) != 3)
@ -135,14 +143,32 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
{
struct pt_regs *regs = task_pt_regs(child);
unsigned long val;
unsigned int seg;
switch (regno) {
case offsetof(struct user_regs_struct, fs):
if (child == current) {
/* Older gas can't assemble movq %?s,%r?? */
asm("movl %%fs,%0" : "=r" (seg));
return seg;
}
return child->thread.fsindex;
case offsetof(struct user_regs_struct, gs):
if (child == current) {
asm("movl %%gs,%0" : "=r" (seg));
return seg;
}
return child->thread.gsindex;
case offsetof(struct user_regs_struct, ds):
if (child == current) {
asm("movl %%ds,%0" : "=r" (seg));
return seg;
}
return child->thread.ds;
case offsetof(struct user_regs_struct, es):
if (child == current) {
asm("movl %%es,%0" : "=r" (seg));
return seg;
}
return child->thread.es;
case offsetof(struct user_regs_struct, fs_base):
/*
@ -152,7 +178,10 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
*/
if (child->thread.fs != 0)
return child->thread.fs;
if (child->thread.fsindex != FS_TLS_SEL)
seg = child->thread.fsindex;
if (child == current)
asm("movl %%fs,%0" : "=r" (seg));
if (seg != FS_TLS_SEL)
return 0;
return get_desc_base(&child->thread.tls_array[FS_TLS]);
case offsetof(struct user_regs_struct, gs_base):
@ -161,7 +190,10 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
*/
if (child->thread.gs != 0)
return child->thread.gs;
if (child->thread.gsindex != GS_TLS_SEL)
seg = child->thread.gsindex;
if (child == current)
asm("movl %%gs,%0" : "=r" (seg));
if (seg != GS_TLS_SEL)
return 0;
return get_desc_base(&child->thread.tls_array[GS_TLS]);
case offsetof(struct user_regs_struct, flags):